2 * Recursive Merge algorithm stolen from git-merge-recursive.py by
4 * The thieves were Alex Riesen and Johannes Schindelin, in June/July 2006
10 #include "cache-tree.h"
11 #include "object-store.h"
12 #include "repository.h"
16 #include "tree-walk.h"
21 #include "unpack-trees.h"
22 #include "string-list.h"
23 #include "xdiff-interface.h"
26 #include "merge-recursive.h"
28 #include "submodule.h"
30 #include "commit-reach.h"
32 struct path_hashmap_entry
{
33 struct hashmap_entry e
;
34 char path
[FLEX_ARRAY
];
37 static int path_hashmap_cmp(const void *cmp_data
,
38 const struct hashmap_entry
*eptr
,
39 const struct hashmap_entry
*entry_or_key
,
42 const struct path_hashmap_entry
*a
, *b
;
43 const char *key
= keydata
;
45 a
= container_of(eptr
, const struct path_hashmap_entry
, e
);
46 b
= container_of(entry_or_key
, const struct path_hashmap_entry
, e
);
49 return strcasecmp(a
->path
, key
? key
: b
->path
);
51 return strcmp(a
->path
, key
? key
: b
->path
);
54 static unsigned int path_hash(const char *path
)
56 return ignore_case
? strihash(path
) : strhash(path
);
59 static struct dir_rename_entry
*dir_rename_find_entry(struct hashmap
*hashmap
,
62 struct dir_rename_entry key
;
66 hashmap_entry_init(&key
.ent
, strhash(dir
));
68 return hashmap_get_entry(hashmap
, &key
, NULL
,
69 struct dir_rename_entry
, ent
);
72 static int dir_rename_cmp(const void *unused_cmp_data
,
73 const struct hashmap_entry
*eptr
,
74 const struct hashmap_entry
*entry_or_key
,
75 const void *unused_keydata
)
77 const struct dir_rename_entry
*e1
, *e2
;
79 e1
= container_of(eptr
, const struct dir_rename_entry
, ent
);
80 e2
= container_of(entry_or_key
, const struct dir_rename_entry
, ent
);
82 return strcmp(e1
->dir
, e2
->dir
);
85 static void dir_rename_init(struct hashmap
*map
)
87 hashmap_init(map
, dir_rename_cmp
, NULL
, 0);
90 static void dir_rename_entry_init(struct dir_rename_entry
*entry
,
93 hashmap_entry_init(&entry
->ent
, strhash(directory
));
94 entry
->dir
= directory
;
95 entry
->non_unique_new_dir
= 0;
96 strbuf_init(&entry
->new_dir
, 0);
97 string_list_init(&entry
->possible_new_dirs
, 0);
100 static struct collision_entry
*collision_find_entry(struct hashmap
*hashmap
,
103 struct collision_entry key
;
105 hashmap_entry_init(&key
.ent
, strhash(target_file
));
106 key
.target_file
= target_file
;
107 return hashmap_get_entry(hashmap
, &key
, NULL
,
108 struct collision_entry
, ent
);
111 static int collision_cmp(const void *unused_cmp_data
,
112 const struct hashmap_entry
*eptr
,
113 const struct hashmap_entry
*entry_or_key
,
114 const void *unused_keydata
)
116 const struct collision_entry
*e1
, *e2
;
118 e1
= container_of(eptr
, const struct collision_entry
, ent
);
119 e2
= container_of(entry_or_key
, const struct collision_entry
, ent
);
121 return strcmp(e1
->target_file
, e2
->target_file
);
124 static void collision_init(struct hashmap
*map
)
126 hashmap_init(map
, collision_cmp
, NULL
, 0);
129 static void flush_output(struct merge_options
*opt
)
131 if (opt
->buffer_output
< 2 && opt
->obuf
.len
) {
132 fputs(opt
->obuf
.buf
, stdout
);
133 strbuf_reset(&opt
->obuf
);
137 static int err(struct merge_options
*opt
, const char *err
, ...)
141 if (opt
->buffer_output
< 2)
144 strbuf_complete(&opt
->obuf
, '\n');
145 strbuf_addstr(&opt
->obuf
, "error: ");
147 va_start(params
, err
);
148 strbuf_vaddf(&opt
->obuf
, err
, params
);
150 if (opt
->buffer_output
> 1)
151 strbuf_addch(&opt
->obuf
, '\n');
153 error("%s", opt
->obuf
.buf
);
154 strbuf_reset(&opt
->obuf
);
160 static struct tree
*shift_tree_object(struct repository
*repo
,
161 struct tree
*one
, struct tree
*two
,
162 const char *subtree_shift
)
164 struct object_id shifted
;
166 if (!*subtree_shift
) {
167 shift_tree(repo
, &one
->object
.oid
, &two
->object
.oid
, &shifted
, 0);
169 shift_tree_by(repo
, &one
->object
.oid
, &two
->object
.oid
, &shifted
,
172 if (oideq(&two
->object
.oid
, &shifted
))
174 return lookup_tree(repo
, &shifted
);
177 static inline void set_commit_tree(struct commit
*c
, struct tree
*t
)
182 static struct commit
*make_virtual_commit(struct repository
*repo
,
186 struct commit
*commit
= alloc_commit_node(repo
);
188 set_merge_remote_desc(commit
, comment
, (struct object
*)commit
);
189 set_commit_tree(commit
, tree
);
190 commit
->object
.parsed
= 1;
195 * Since we use get_tree_entry(), which does not put the read object into
196 * the object pool, we cannot rely on a == b.
198 static int oid_eq(const struct object_id
*a
, const struct object_id
*b
)
202 return a
&& b
&& oideq(a
, b
);
210 RENAME_ONE_FILE_TO_ONE
,
211 RENAME_ONE_FILE_TO_TWO
,
212 RENAME_TWO_FILES_TO_ONE
216 * Since we want to write the index eventually, we cannot reuse the index
217 * for these (temporary) data.
220 struct diff_filespec stages
[4]; /* mostly for oid & mode; maybe path */
221 struct rename_conflict_info
*rename_conflict_info
;
222 unsigned processed
:1;
226 unsigned processed
:1;
227 struct diff_filepair
*pair
;
228 const char *branch
; /* branch that the rename occurred on */
230 * If directory rename detection affected this rename, what was its
231 * original type ('A' or 'R') and it's original destination before
232 * the directory rename (otherwise, '\0' and NULL for these two vars).
234 char dir_rename_original_type
;
235 char *dir_rename_original_dest
;
237 * Purpose of src_entry and dst_entry:
239 * If 'before' is renamed to 'after' then src_entry will contain
240 * the versions of 'before' from the merge_base, HEAD, and MERGE in
241 * stages 1, 2, and 3; dst_entry will contain the respective
242 * versions of 'after' in corresponding locations. Thus, we have a
243 * total of six modes and oids, though some will be null. (Stage 0
244 * is ignored; we're interested in handling conflicts.)
246 * Since we don't turn on break-rewrites by default, neither
247 * src_entry nor dst_entry can have all three of their stages have
248 * non-null oids, meaning at most four of the six will be non-null.
249 * Also, since this is a rename, both src_entry and dst_entry will
250 * have at least one non-null oid, meaning at least two will be
251 * non-null. Of the six oids, a typical rename will have three be
252 * non-null. Only two implies a rename/delete, and four implies a
255 struct stage_data
*src_entry
;
256 struct stage_data
*dst_entry
;
259 struct rename_conflict_info
{
260 enum rename_type rename_type
;
265 static inline void setup_rename_conflict_info(enum rename_type rename_type
,
266 struct merge_options
*opt
,
270 struct rename_conflict_info
*ci
;
273 * When we have two renames involved, it's easiest to get the
274 * correct things into stage 2 and 3, and to make sure that the
275 * content merge puts HEAD before the other branch if we just
276 * ensure that branch1 == opt->branch1. So, simply flip arguments
277 * around if we don't have that.
279 if (ren2
&& ren1
->branch
!= opt
->branch1
) {
280 setup_rename_conflict_info(rename_type
, opt
, ren2
, ren1
);
284 ci
= xcalloc(1, sizeof(struct rename_conflict_info
));
285 ci
->rename_type
= rename_type
;
289 ci
->ren1
->dst_entry
->processed
= 0;
290 ci
->ren1
->dst_entry
->rename_conflict_info
= ci
;
292 ci
->ren2
->dst_entry
->rename_conflict_info
= ci
;
296 static int show(struct merge_options
*opt
, int v
)
298 return (!opt
->call_depth
&& opt
->verbosity
>= v
) || opt
->verbosity
>= 5;
301 __attribute__((format (printf
, 3, 4)))
302 static void output(struct merge_options
*opt
, int v
, const char *fmt
, ...)
309 strbuf_addchars(&opt
->obuf
, ' ', opt
->call_depth
* 2);
312 strbuf_vaddf(&opt
->obuf
, fmt
, ap
);
315 strbuf_addch(&opt
->obuf
, '\n');
316 if (!opt
->buffer_output
)
320 static void output_commit_title(struct merge_options
*opt
, struct commit
*commit
)
322 struct merge_remote_desc
*desc
;
324 strbuf_addchars(&opt
->obuf
, ' ', opt
->call_depth
* 2);
325 desc
= merge_remote_util(commit
);
327 strbuf_addf(&opt
->obuf
, "virtual %s\n", desc
->name
);
329 strbuf_add_unique_abbrev(&opt
->obuf
, &commit
->object
.oid
,
331 strbuf_addch(&opt
->obuf
, ' ');
332 if (parse_commit(commit
) != 0)
333 strbuf_addstr(&opt
->obuf
, _("(bad commit)\n"));
336 const char *msg
= get_commit_buffer(commit
, NULL
);
337 int len
= find_commit_subject(msg
, &title
);
339 strbuf_addf(&opt
->obuf
, "%.*s\n", len
, title
);
340 unuse_commit_buffer(commit
, msg
);
346 static int add_cacheinfo(struct merge_options
*opt
,
347 const struct diff_filespec
*blob
,
348 const char *path
, int stage
, int refresh
, int options
)
350 struct index_state
*istate
= opt
->repo
->index
;
351 struct cache_entry
*ce
;
354 ce
= make_cache_entry(istate
, blob
->mode
, &blob
->oid
, path
, stage
, 0);
356 return err(opt
, _("add_cacheinfo failed for path '%s'; merge aborting."), path
);
358 ret
= add_index_entry(istate
, ce
, options
);
360 struct cache_entry
*nce
;
362 nce
= refresh_cache_entry(istate
, ce
,
363 CE_MATCH_REFRESH
| CE_MATCH_IGNORE_MISSING
);
365 return err(opt
, _("add_cacheinfo failed to refresh for path '%s'; merge aborting."), path
);
367 ret
= add_index_entry(istate
, nce
, options
);
372 static void init_tree_desc_from_tree(struct tree_desc
*desc
, struct tree
*tree
)
375 init_tree_desc(desc
, tree
->buffer
, tree
->size
);
378 static int unpack_trees_start(struct merge_options
*opt
,
384 struct tree_desc t
[3];
385 struct index_state tmp_index
= { NULL
};
387 memset(&opt
->unpack_opts
, 0, sizeof(opt
->unpack_opts
));
389 opt
->unpack_opts
.index_only
= 1;
391 opt
->unpack_opts
.update
= 1;
392 opt
->unpack_opts
.merge
= 1;
393 opt
->unpack_opts
.head_idx
= 2;
394 opt
->unpack_opts
.fn
= threeway_merge
;
395 opt
->unpack_opts
.src_index
= opt
->repo
->index
;
396 opt
->unpack_opts
.dst_index
= &tmp_index
;
397 opt
->unpack_opts
.aggressive
= !merge_detect_rename(opt
);
398 setup_unpack_trees_porcelain(&opt
->unpack_opts
, "merge");
400 init_tree_desc_from_tree(t
+0, common
);
401 init_tree_desc_from_tree(t
+1, head
);
402 init_tree_desc_from_tree(t
+2, merge
);
404 rc
= unpack_trees(3, t
, &opt
->unpack_opts
);
405 cache_tree_free(&opt
->repo
->index
->cache_tree
);
408 * Update opt->repo->index to match the new results, AFTER saving a copy
409 * in opt->orig_index. Update src_index to point to the saved copy.
410 * (verify_uptodate() checks src_index, and the original index is
411 * the one that had the necessary modification timestamps.)
413 opt
->orig_index
= *opt
->repo
->index
;
414 *opt
->repo
->index
= tmp_index
;
415 opt
->unpack_opts
.src_index
= &opt
->orig_index
;
420 static void unpack_trees_finish(struct merge_options
*opt
)
422 discard_index(&opt
->orig_index
);
423 clear_unpack_trees_porcelain(&opt
->unpack_opts
);
426 struct tree
*write_tree_from_memory(struct merge_options
*opt
)
428 struct tree
*result
= NULL
;
429 struct index_state
*istate
= opt
->repo
->index
;
431 if (unmerged_index(istate
)) {
433 fprintf(stderr
, "BUG: There are unmerged index entries:\n");
434 for (i
= 0; i
< istate
->cache_nr
; i
++) {
435 const struct cache_entry
*ce
= istate
->cache
[i
];
437 fprintf(stderr
, "BUG: %d %.*s\n", ce_stage(ce
),
438 (int)ce_namelen(ce
), ce
->name
);
440 BUG("unmerged index entries in merge-recursive.c");
443 if (!istate
->cache_tree
)
444 istate
->cache_tree
= cache_tree();
446 if (!cache_tree_fully_valid(istate
->cache_tree
) &&
447 cache_tree_update(istate
, 0) < 0) {
448 err(opt
, _("error building trees"));
452 result
= lookup_tree(opt
->repo
, &istate
->cache_tree
->oid
);
457 static int save_files_dirs(const struct object_id
*oid
,
458 struct strbuf
*base
, const char *path
,
459 unsigned int mode
, int stage
, void *context
)
461 struct path_hashmap_entry
*entry
;
462 int baselen
= base
->len
;
463 struct merge_options
*opt
= context
;
465 strbuf_addstr(base
, path
);
467 FLEX_ALLOC_MEM(entry
, path
, base
->buf
, base
->len
);
468 hashmap_entry_init(&entry
->e
, path_hash(entry
->path
));
469 hashmap_add(&opt
->current_file_dir_set
, &entry
->e
);
471 strbuf_setlen(base
, baselen
);
472 return (S_ISDIR(mode
) ? READ_TREE_RECURSIVE
: 0);
475 static void get_files_dirs(struct merge_options
*opt
, struct tree
*tree
)
477 struct pathspec match_all
;
478 memset(&match_all
, 0, sizeof(match_all
));
479 read_tree_recursive(opt
->repo
, tree
, "", 0, 0,
480 &match_all
, save_files_dirs
, opt
);
483 static int get_tree_entry_if_blob(struct repository
*r
,
484 const struct object_id
*tree
,
486 struct diff_filespec
*dfs
)
490 ret
= get_tree_entry(r
, tree
, path
, &dfs
->oid
, &dfs
->mode
);
491 if (S_ISDIR(dfs
->mode
)) {
492 oidcpy(&dfs
->oid
, &null_oid
);
499 * Returns an index_entry instance which doesn't have to correspond to
500 * a real cache entry in Git's index.
502 static struct stage_data
*insert_stage_data(struct repository
*r
,
504 struct tree
*o
, struct tree
*a
, struct tree
*b
,
505 struct string_list
*entries
)
507 struct string_list_item
*item
;
508 struct stage_data
*e
= xcalloc(1, sizeof(struct stage_data
));
509 get_tree_entry_if_blob(r
, &o
->object
.oid
, path
, &e
->stages
[1]);
510 get_tree_entry_if_blob(r
, &a
->object
.oid
, path
, &e
->stages
[2]);
511 get_tree_entry_if_blob(r
, &b
->object
.oid
, path
, &e
->stages
[3]);
512 item
= string_list_insert(entries
, path
);
518 * Create a dictionary mapping file names to stage_data objects. The
519 * dictionary contains one entry for every path with a non-zero stage entry.
521 static struct string_list
*get_unmerged(struct index_state
*istate
)
523 struct string_list
*unmerged
= xcalloc(1, sizeof(struct string_list
));
526 unmerged
->strdup_strings
= 1;
528 for (i
= 0; i
< istate
->cache_nr
; i
++) {
529 struct string_list_item
*item
;
530 struct stage_data
*e
;
531 const struct cache_entry
*ce
= istate
->cache
[i
];
535 item
= string_list_lookup(unmerged
, ce
->name
);
537 item
= string_list_insert(unmerged
, ce
->name
);
538 item
->util
= xcalloc(1, sizeof(struct stage_data
));
541 e
->stages
[ce_stage(ce
)].mode
= ce
->ce_mode
;
542 oidcpy(&e
->stages
[ce_stage(ce
)].oid
, &ce
->oid
);
548 static int string_list_df_name_compare(const char *one
, const char *two
)
550 int onelen
= strlen(one
);
551 int twolen
= strlen(two
);
553 * Here we only care that entries for D/F conflicts are
554 * adjacent, in particular with the file of the D/F conflict
555 * appearing before files below the corresponding directory.
556 * The order of the rest of the list is irrelevant for us.
558 * To achieve this, we sort with df_name_compare and provide
559 * the mode S_IFDIR so that D/F conflicts will sort correctly.
560 * We use the mode S_IFDIR for everything else for simplicity,
561 * since in other cases any changes in their order due to
562 * sorting cause no problems for us.
564 int cmp
= df_name_compare(one
, onelen
, S_IFDIR
,
565 two
, twolen
, S_IFDIR
);
567 * Now that 'foo' and 'foo/bar' compare equal, we have to make sure
568 * that 'foo' comes before 'foo/bar'.
572 return onelen
- twolen
;
575 static void record_df_conflict_files(struct merge_options
*opt
,
576 struct string_list
*entries
)
578 /* If there is a D/F conflict and the file for such a conflict
579 * currently exists in the working tree, we want to allow it to be
580 * removed to make room for the corresponding directory if needed.
581 * The files underneath the directories of such D/F conflicts will
582 * be processed before the corresponding file involved in the D/F
583 * conflict. If the D/F directory ends up being removed by the
584 * merge, then we won't have to touch the D/F file. If the D/F
585 * directory needs to be written to the working copy, then the D/F
586 * file will simply be removed (in make_room_for_path()) to make
587 * room for the necessary paths. Note that if both the directory
588 * and the file need to be present, then the D/F file will be
589 * reinstated with a new unique name at the time it is processed.
591 struct string_list df_sorted_entries
= STRING_LIST_INIT_NODUP
;
592 const char *last_file
= NULL
;
597 * If we're merging merge-bases, we don't want to bother with
598 * any working directory changes.
603 /* Ensure D/F conflicts are adjacent in the entries list. */
604 for (i
= 0; i
< entries
->nr
; i
++) {
605 struct string_list_item
*next
= &entries
->items
[i
];
606 string_list_append(&df_sorted_entries
, next
->string
)->util
=
609 df_sorted_entries
.cmp
= string_list_df_name_compare
;
610 string_list_sort(&df_sorted_entries
);
612 string_list_clear(&opt
->df_conflict_file_set
, 1);
613 for (i
= 0; i
< df_sorted_entries
.nr
; i
++) {
614 const char *path
= df_sorted_entries
.items
[i
].string
;
615 int len
= strlen(path
);
616 struct stage_data
*e
= df_sorted_entries
.items
[i
].util
;
619 * Check if last_file & path correspond to a D/F conflict;
620 * i.e. whether path is last_file+'/'+<something>.
621 * If so, record that it's okay to remove last_file to make
622 * room for path and friends if needed.
626 memcmp(path
, last_file
, last_len
) == 0 &&
627 path
[last_len
] == '/') {
628 string_list_insert(&opt
->df_conflict_file_set
, last_file
);
632 * Determine whether path could exist as a file in the
633 * working directory as a possible D/F conflict. This
634 * will only occur when it exists in stage 2 as a
637 if (S_ISREG(e
->stages
[2].mode
) || S_ISLNK(e
->stages
[2].mode
)) {
644 string_list_clear(&df_sorted_entries
, 0);
647 static int update_stages(struct merge_options
*opt
, const char *path
,
648 const struct diff_filespec
*o
,
649 const struct diff_filespec
*a
,
650 const struct diff_filespec
*b
)
654 * NOTE: It is usually a bad idea to call update_stages on a path
655 * before calling update_file on that same path, since it can
656 * sometimes lead to spurious "refusing to lose untracked file..."
657 * messages from update_file (via make_room_for path via
658 * would_lose_untracked). Instead, reverse the order of the calls
659 * (executing update_file first and then update_stages).
662 int options
= ADD_CACHE_OK_TO_ADD
| ADD_CACHE_SKIP_DFCHECK
;
664 if (remove_file_from_index(opt
->repo
->index
, path
))
667 if (add_cacheinfo(opt
, o
, path
, 1, 0, options
))
670 if (add_cacheinfo(opt
, a
, path
, 2, 0, options
))
673 if (add_cacheinfo(opt
, b
, path
, 3, 0, options
))
678 static void update_entry(struct stage_data
*entry
,
679 struct diff_filespec
*o
,
680 struct diff_filespec
*a
,
681 struct diff_filespec
*b
)
683 entry
->processed
= 0;
684 entry
->stages
[1].mode
= o
->mode
;
685 entry
->stages
[2].mode
= a
->mode
;
686 entry
->stages
[3].mode
= b
->mode
;
687 oidcpy(&entry
->stages
[1].oid
, &o
->oid
);
688 oidcpy(&entry
->stages
[2].oid
, &a
->oid
);
689 oidcpy(&entry
->stages
[3].oid
, &b
->oid
);
692 static int remove_file(struct merge_options
*opt
, int clean
,
693 const char *path
, int no_wd
)
695 int update_cache
= opt
->call_depth
|| clean
;
696 int update_working_directory
= !opt
->call_depth
&& !no_wd
;
699 if (remove_file_from_index(opt
->repo
->index
, path
))
702 if (update_working_directory
) {
704 struct cache_entry
*ce
;
705 ce
= index_file_exists(opt
->repo
->index
, path
, strlen(path
),
707 if (ce
&& ce_stage(ce
) == 0 && strcmp(path
, ce
->name
))
710 if (remove_path(path
))
716 /* add a string to a strbuf, but converting "/" to "_" */
717 static void add_flattened_path(struct strbuf
*out
, const char *s
)
720 strbuf_addstr(out
, s
);
721 for (; i
< out
->len
; i
++)
722 if (out
->buf
[i
] == '/')
726 static char *unique_path(struct merge_options
*opt
, const char *path
, const char *branch
)
728 struct path_hashmap_entry
*entry
;
729 struct strbuf newpath
= STRBUF_INIT
;
733 strbuf_addf(&newpath
, "%s~", path
);
734 add_flattened_path(&newpath
, branch
);
736 base_len
= newpath
.len
;
737 while (hashmap_get_from_hash(&opt
->current_file_dir_set
,
738 path_hash(newpath
.buf
), newpath
.buf
) ||
739 (!opt
->call_depth
&& file_exists(newpath
.buf
))) {
740 strbuf_setlen(&newpath
, base_len
);
741 strbuf_addf(&newpath
, "_%d", suffix
++);
744 FLEX_ALLOC_MEM(entry
, path
, newpath
.buf
, newpath
.len
);
745 hashmap_entry_init(&entry
->e
, path_hash(entry
->path
));
746 hashmap_add(&opt
->current_file_dir_set
, &entry
->e
);
747 return strbuf_detach(&newpath
, NULL
);
751 * Check whether a directory in the index is in the way of an incoming
752 * file. Return 1 if so. If check_working_copy is non-zero, also
753 * check the working directory. If empty_ok is non-zero, also return
754 * 0 in the case where the working-tree dir exists but is empty.
756 static int dir_in_way(struct index_state
*istate
, const char *path
,
757 int check_working_copy
, int empty_ok
)
760 struct strbuf dirpath
= STRBUF_INIT
;
763 strbuf_addstr(&dirpath
, path
);
764 strbuf_addch(&dirpath
, '/');
766 pos
= index_name_pos(istate
, dirpath
.buf
, dirpath
.len
);
770 if (pos
< istate
->cache_nr
&&
771 !strncmp(dirpath
.buf
, istate
->cache
[pos
]->name
, dirpath
.len
)) {
772 strbuf_release(&dirpath
);
776 strbuf_release(&dirpath
);
777 return check_working_copy
&& !lstat(path
, &st
) && S_ISDIR(st
.st_mode
) &&
778 !(empty_ok
&& is_empty_dir(path
));
782 * Returns whether path was tracked in the index before the merge started,
783 * and its oid and mode match the specified values
785 static int was_tracked_and_matches(struct merge_options
*opt
, const char *path
,
786 const struct diff_filespec
*blob
)
788 int pos
= index_name_pos(&opt
->orig_index
, path
, strlen(path
));
789 struct cache_entry
*ce
;
792 /* we were not tracking this path before the merge */
795 /* See if the file we were tracking before matches */
796 ce
= opt
->orig_index
.cache
[pos
];
797 return (oid_eq(&ce
->oid
, &blob
->oid
) && ce
->ce_mode
== blob
->mode
);
801 * Returns whether path was tracked in the index before the merge started
803 static int was_tracked(struct merge_options
*opt
, const char *path
)
805 int pos
= index_name_pos(&opt
->orig_index
, path
, strlen(path
));
808 /* we were tracking this path before the merge */
814 static int would_lose_untracked(struct merge_options
*opt
, const char *path
)
816 struct index_state
*istate
= opt
->repo
->index
;
819 * This may look like it can be simplified to:
820 * return !was_tracked(opt, path) && file_exists(path)
821 * but it can't. This function needs to know whether path was in
822 * the working tree due to EITHER having been tracked in the index
823 * before the merge OR having been put into the working copy and
824 * index by unpack_trees(). Due to that either-or requirement, we
825 * check the current index instead of the original one.
827 * Note that we do not need to worry about merge-recursive itself
828 * updating the index after unpack_trees() and before calling this
829 * function, because we strictly require all code paths in
830 * merge-recursive to update the working tree first and the index
831 * second. Doing otherwise would break
832 * update_file()/would_lose_untracked(); see every comment in this
833 * file which mentions "update_stages".
835 int pos
= index_name_pos(istate
, path
, strlen(path
));
839 while (pos
< istate
->cache_nr
&&
840 !strcmp(path
, istate
->cache
[pos
]->name
)) {
842 * If stage #0, it is definitely tracked.
843 * If it has stage #2 then it was tracked
844 * before this merge started. All other
845 * cases the path was not tracked.
847 switch (ce_stage(istate
->cache
[pos
])) {
854 return file_exists(path
);
857 static int was_dirty(struct merge_options
*opt
, const char *path
)
859 struct cache_entry
*ce
;
862 if (opt
->call_depth
|| !was_tracked(opt
, path
))
865 ce
= index_file_exists(opt
->unpack_opts
.src_index
,
866 path
, strlen(path
), ignore_case
);
867 dirty
= verify_uptodate(ce
, &opt
->unpack_opts
) != 0;
871 static int make_room_for_path(struct merge_options
*opt
, const char *path
)
874 const char *msg
= _("failed to create path '%s'%s");
876 /* Unlink any D/F conflict files that are in the way */
877 for (i
= 0; i
< opt
->df_conflict_file_set
.nr
; i
++) {
878 const char *df_path
= opt
->df_conflict_file_set
.items
[i
].string
;
879 size_t pathlen
= strlen(path
);
880 size_t df_pathlen
= strlen(df_path
);
881 if (df_pathlen
< pathlen
&&
882 path
[df_pathlen
] == '/' &&
883 strncmp(path
, df_path
, df_pathlen
) == 0) {
885 _("Removing %s to make room for subdirectory\n"),
888 unsorted_string_list_delete_item(&opt
->df_conflict_file_set
,
894 /* Make sure leading directories are created */
895 status
= safe_create_leading_directories_const(path
);
897 if (status
== SCLD_EXISTS
)
898 /* something else exists */
899 return err(opt
, msg
, path
, _(": perhaps a D/F conflict?"));
900 return err(opt
, msg
, path
, "");
904 * Do not unlink a file in the work tree if we are not
907 if (would_lose_untracked(opt
, path
))
908 return err(opt
, _("refusing to lose untracked file at '%s'"),
911 /* Successful unlink is good.. */
914 /* .. and so is no existing file */
917 /* .. but not some other error (who really cares what?) */
918 return err(opt
, msg
, path
, _(": perhaps a D/F conflict?"));
921 static int update_file_flags(struct merge_options
*opt
,
922 const struct diff_filespec
*contents
,
933 enum object_type type
;
937 if (S_ISGITLINK(contents
->mode
)) {
939 * We may later decide to recursively descend into
940 * the submodule directory and update its index
941 * and/or work tree, but we do not do that now.
947 buf
= read_object_file(&contents
->oid
, &type
, &size
);
949 return err(opt
, _("cannot read object %s '%s'"),
950 oid_to_hex(&contents
->oid
), path
);
951 if (type
!= OBJ_BLOB
) {
952 ret
= err(opt
, _("blob expected for %s '%s'"),
953 oid_to_hex(&contents
->oid
), path
);
956 if (S_ISREG(contents
->mode
)) {
957 struct strbuf strbuf
= STRBUF_INIT
;
958 if (convert_to_working_tree(opt
->repo
->index
, path
, buf
, size
, &strbuf
)) {
961 buf
= strbuf_detach(&strbuf
, NULL
);
965 if (make_room_for_path(opt
, path
) < 0) {
969 if (S_ISREG(contents
->mode
) ||
970 (!has_symlinks
&& S_ISLNK(contents
->mode
))) {
972 int mode
= (contents
->mode
& 0100 ? 0777 : 0666);
974 fd
= open(path
, O_WRONLY
| O_TRUNC
| O_CREAT
, mode
);
976 ret
= err(opt
, _("failed to open '%s': %s"),
977 path
, strerror(errno
));
980 write_in_full(fd
, buf
, size
);
982 } else if (S_ISLNK(contents
->mode
)) {
983 char *lnk
= xmemdupz(buf
, size
);
984 safe_create_leading_directories_const(path
);
986 if (symlink(lnk
, path
))
987 ret
= err(opt
, _("failed to symlink '%s': %s"),
988 path
, strerror(errno
));
992 _("do not know what to do with %06o %s '%s'"),
993 contents
->mode
, oid_to_hex(&contents
->oid
), path
);
998 if (!ret
&& update_cache
)
999 if (add_cacheinfo(opt
, contents
, path
, 0, update_wd
,
1000 ADD_CACHE_OK_TO_ADD
))
1005 static int update_file(struct merge_options
*opt
,
1007 const struct diff_filespec
*contents
,
1010 return update_file_flags(opt
, contents
, path
,
1011 opt
->call_depth
|| clean
, !opt
->call_depth
);
1014 /* Low level file merging, update and removal */
1016 struct merge_file_info
{
1017 struct diff_filespec blob
; /* mostly use oid & mode; sometimes path */
1022 static int merge_3way(struct merge_options
*opt
,
1023 mmbuffer_t
*result_buf
,
1024 const struct diff_filespec
*o
,
1025 const struct diff_filespec
*a
,
1026 const struct diff_filespec
*b
,
1027 const char *branch1
,
1028 const char *branch2
,
1029 const int extra_marker_size
)
1031 mmfile_t orig
, src1
, src2
;
1032 struct ll_merge_options ll_opts
= {0};
1033 char *base_name
, *name1
, *name2
;
1036 ll_opts
.renormalize
= opt
->renormalize
;
1037 ll_opts
.extra_marker_size
= extra_marker_size
;
1038 ll_opts
.xdl_opts
= opt
->xdl_opts
;
1040 if (opt
->call_depth
) {
1041 ll_opts
.virtual_ancestor
= 1;
1042 ll_opts
.variant
= 0;
1044 switch (opt
->recursive_variant
) {
1045 case MERGE_RECURSIVE_OURS
:
1046 ll_opts
.variant
= XDL_MERGE_FAVOR_OURS
;
1048 case MERGE_RECURSIVE_THEIRS
:
1049 ll_opts
.variant
= XDL_MERGE_FAVOR_THEIRS
;
1052 ll_opts
.variant
= 0;
1057 assert(a
->path
&& b
->path
);
1058 if (strcmp(a
->path
, b
->path
) ||
1059 (opt
->ancestor
!= NULL
&& strcmp(a
->path
, o
->path
) != 0)) {
1060 base_name
= opt
->ancestor
== NULL
? NULL
:
1061 mkpathdup("%s:%s", opt
->ancestor
, o
->path
);
1062 name1
= mkpathdup("%s:%s", branch1
, a
->path
);
1063 name2
= mkpathdup("%s:%s", branch2
, b
->path
);
1065 base_name
= opt
->ancestor
== NULL
? NULL
:
1066 mkpathdup("%s", opt
->ancestor
);
1067 name1
= mkpathdup("%s", branch1
);
1068 name2
= mkpathdup("%s", branch2
);
1071 read_mmblob(&orig
, &o
->oid
);
1072 read_mmblob(&src1
, &a
->oid
);
1073 read_mmblob(&src2
, &b
->oid
);
1075 merge_status
= ll_merge(result_buf
, a
->path
, &orig
, base_name
,
1076 &src1
, name1
, &src2
, name2
,
1077 opt
->repo
->index
, &ll_opts
);
1085 return merge_status
;
1088 static int find_first_merges(struct repository
*repo
,
1089 struct object_array
*result
, const char *path
,
1090 struct commit
*a
, struct commit
*b
)
1093 struct object_array merges
= OBJECT_ARRAY_INIT
;
1094 struct commit
*commit
;
1095 int contains_another
;
1097 char merged_revision
[GIT_MAX_HEXSZ
+ 2];
1098 const char *rev_args
[] = { "rev-list", "--merges", "--ancestry-path",
1099 "--all", merged_revision
, NULL
};
1100 struct rev_info revs
;
1101 struct setup_revision_opt rev_opts
;
1103 memset(result
, 0, sizeof(struct object_array
));
1104 memset(&rev_opts
, 0, sizeof(rev_opts
));
1106 /* get all revisions that merge commit a */
1107 xsnprintf(merged_revision
, sizeof(merged_revision
), "^%s",
1108 oid_to_hex(&a
->object
.oid
));
1109 repo_init_revisions(repo
, &revs
, NULL
);
1110 rev_opts
.submodule
= path
;
1111 /* FIXME: can't handle linked worktrees in submodules yet */
1112 revs
.single_worktree
= path
!= NULL
;
1113 setup_revisions(ARRAY_SIZE(rev_args
)-1, rev_args
, &revs
, &rev_opts
);
1115 /* save all revisions from the above list that contain b */
1116 if (prepare_revision_walk(&revs
))
1117 die("revision walk setup failed");
1118 while ((commit
= get_revision(&revs
)) != NULL
) {
1119 struct object
*o
= &(commit
->object
);
1120 if (in_merge_bases(b
, commit
))
1121 add_object_array(o
, NULL
, &merges
);
1123 reset_revision_walk();
1125 /* Now we've got all merges that contain a and b. Prune all
1126 * merges that contain another found merge and save them in
1129 for (i
= 0; i
< merges
.nr
; i
++) {
1130 struct commit
*m1
= (struct commit
*) merges
.objects
[i
].item
;
1132 contains_another
= 0;
1133 for (j
= 0; j
< merges
.nr
; j
++) {
1134 struct commit
*m2
= (struct commit
*) merges
.objects
[j
].item
;
1135 if (i
!= j
&& in_merge_bases(m2
, m1
)) {
1136 contains_another
= 1;
1141 if (!contains_another
)
1142 add_object_array(merges
.objects
[i
].item
, NULL
, result
);
1145 object_array_clear(&merges
);
1149 static void print_commit(struct commit
*commit
)
1151 struct strbuf sb
= STRBUF_INIT
;
1152 struct pretty_print_context ctx
= {0};
1153 ctx
.date_mode
.type
= DATE_NORMAL
;
1154 format_commit_message(commit
, " %h: %m %s", &sb
, &ctx
);
1155 fprintf(stderr
, "%s\n", sb
.buf
);
1156 strbuf_release(&sb
);
1159 static int is_valid(const struct diff_filespec
*dfs
)
1161 return dfs
->mode
!= 0 && !is_null_oid(&dfs
->oid
);
1164 static int merge_submodule(struct merge_options
*opt
,
1165 struct object_id
*result
, const char *path
,
1166 const struct object_id
*base
, const struct object_id
*a
,
1167 const struct object_id
*b
)
1169 struct commit
*commit_base
, *commit_a
, *commit_b
;
1171 struct object_array merges
;
1174 int search
= !opt
->call_depth
;
1176 /* store a in result in case we fail */
1179 /* we can not handle deletion conflicts */
1180 if (is_null_oid(base
))
1187 if (add_submodule_odb(path
)) {
1188 output(opt
, 1, _("Failed to merge submodule %s (not checked out)"), path
);
1192 if (!(commit_base
= lookup_commit_reference(opt
->repo
, base
)) ||
1193 !(commit_a
= lookup_commit_reference(opt
->repo
, a
)) ||
1194 !(commit_b
= lookup_commit_reference(opt
->repo
, b
))) {
1195 output(opt
, 1, _("Failed to merge submodule %s (commits not present)"), path
);
1199 /* check whether both changes are forward */
1200 if (!in_merge_bases(commit_base
, commit_a
) ||
1201 !in_merge_bases(commit_base
, commit_b
)) {
1202 output(opt
, 1, _("Failed to merge submodule %s (commits don't follow merge-base)"), path
);
1206 /* Case #1: a is contained in b or vice versa */
1207 if (in_merge_bases(commit_a
, commit_b
)) {
1210 output(opt
, 3, _("Fast-forwarding submodule %s to the following commit:"), path
);
1211 output_commit_title(opt
, commit_b
);
1212 } else if (show(opt
, 2))
1213 output(opt
, 2, _("Fast-forwarding submodule %s"), path
);
1219 if (in_merge_bases(commit_b
, commit_a
)) {
1222 output(opt
, 3, _("Fast-forwarding submodule %s to the following commit:"), path
);
1223 output_commit_title(opt
, commit_a
);
1224 } else if (show(opt
, 2))
1225 output(opt
, 2, _("Fast-forwarding submodule %s"), path
);
1233 * Case #2: There are one or more merges that contain a and b in
1234 * the submodule. If there is only one, then present it as a
1235 * suggestion to the user, but leave it marked unmerged so the
1236 * user needs to confirm the resolution.
1239 /* Skip the search if makes no sense to the calling context. */
1243 /* find commit which merges them */
1244 parent_count
= find_first_merges(opt
->repo
, &merges
, path
,
1245 commit_a
, commit_b
);
1246 switch (parent_count
) {
1248 output(opt
, 1, _("Failed to merge submodule %s (merge following commits not found)"), path
);
1252 output(opt
, 1, _("Failed to merge submodule %s (not fast-forward)"), path
);
1253 output(opt
, 2, _("Found a possible merge resolution for the submodule:\n"));
1254 print_commit((struct commit
*) merges
.objects
[0].item
);
1256 "If this is correct simply add it to the index "
1259 " git update-index --cacheinfo 160000 %s \"%s\"\n\n"
1260 "which will accept this suggestion.\n"),
1261 oid_to_hex(&merges
.objects
[0].item
->oid
), path
);
1265 output(opt
, 1, _("Failed to merge submodule %s (multiple merges found)"), path
);
1266 for (i
= 0; i
< merges
.nr
; i
++)
1267 print_commit((struct commit
*) merges
.objects
[i
].item
);
1270 object_array_clear(&merges
);
1274 static int merge_mode_and_contents(struct merge_options
*opt
,
1275 const struct diff_filespec
*o
,
1276 const struct diff_filespec
*a
,
1277 const struct diff_filespec
*b
,
1278 const char *filename
,
1279 const char *branch1
,
1280 const char *branch2
,
1281 const int extra_marker_size
,
1282 struct merge_file_info
*result
)
1284 if (opt
->branch1
!= branch1
) {
1286 * It's weird getting a reverse merge with HEAD on the bottom
1287 * side of the conflict markers and the other branch on the
1290 return merge_mode_and_contents(opt
, o
, b
, a
,
1293 extra_marker_size
, result
);
1299 if ((S_IFMT
& a
->mode
) != (S_IFMT
& b
->mode
)) {
1301 if (S_ISREG(a
->mode
)) {
1302 result
->blob
.mode
= a
->mode
;
1303 oidcpy(&result
->blob
.oid
, &a
->oid
);
1305 result
->blob
.mode
= b
->mode
;
1306 oidcpy(&result
->blob
.oid
, &b
->oid
);
1309 if (!oid_eq(&a
->oid
, &o
->oid
) && !oid_eq(&b
->oid
, &o
->oid
))
1315 if (a
->mode
== b
->mode
|| a
->mode
== o
->mode
)
1316 result
->blob
.mode
= b
->mode
;
1318 result
->blob
.mode
= a
->mode
;
1319 if (b
->mode
!= o
->mode
) {
1325 if (oid_eq(&a
->oid
, &b
->oid
) || oid_eq(&a
->oid
, &o
->oid
))
1326 oidcpy(&result
->blob
.oid
, &b
->oid
);
1327 else if (oid_eq(&b
->oid
, &o
->oid
))
1328 oidcpy(&result
->blob
.oid
, &a
->oid
);
1329 else if (S_ISREG(a
->mode
)) {
1330 mmbuffer_t result_buf
;
1331 int ret
= 0, merge_status
;
1333 merge_status
= merge_3way(opt
, &result_buf
, o
, a
, b
,
1337 if ((merge_status
< 0) || !result_buf
.ptr
)
1338 ret
= err(opt
, _("Failed to execute internal merge"));
1341 write_object_file(result_buf
.ptr
, result_buf
.size
,
1342 blob_type
, &result
->blob
.oid
))
1343 ret
= err(opt
, _("Unable to add %s to database"),
1346 free(result_buf
.ptr
);
1349 result
->clean
= (merge_status
== 0);
1350 } else if (S_ISGITLINK(a
->mode
)) {
1351 result
->clean
= merge_submodule(opt
, &result
->blob
.oid
,
1356 } else if (S_ISLNK(a
->mode
)) {
1357 switch (opt
->recursive_variant
) {
1358 case MERGE_RECURSIVE_NORMAL
:
1359 oidcpy(&result
->blob
.oid
, &a
->oid
);
1360 if (!oid_eq(&a
->oid
, &b
->oid
))
1363 case MERGE_RECURSIVE_OURS
:
1364 oidcpy(&result
->blob
.oid
, &a
->oid
);
1366 case MERGE_RECURSIVE_THEIRS
:
1367 oidcpy(&result
->blob
.oid
, &b
->oid
);
1371 BUG("unsupported object type in the tree");
1375 output(opt
, 2, _("Auto-merging %s"), filename
);
1380 static int handle_rename_via_dir(struct merge_options
*opt
,
1381 struct rename_conflict_info
*ci
)
1384 * Handle file adds that need to be renamed due to directory rename
1385 * detection. This differs from handle_rename_normal, because
1386 * there is no content merge to do; just move the file into the
1387 * desired final location.
1389 const struct rename
*ren
= ci
->ren1
;
1390 const struct diff_filespec
*dest
= ren
->pair
->two
;
1391 char *file_path
= dest
->path
;
1392 int mark_conflicted
= (opt
->detect_directory_renames
== 1);
1393 assert(ren
->dir_rename_original_dest
);
1395 if (!opt
->call_depth
&& would_lose_untracked(opt
, dest
->path
)) {
1396 mark_conflicted
= 1;
1397 file_path
= unique_path(opt
, dest
->path
, ren
->branch
);
1398 output(opt
, 1, _("Error: Refusing to lose untracked file at %s; "
1399 "writing to %s instead."),
1400 dest
->path
, file_path
);
1403 if (mark_conflicted
) {
1405 * Write the file in worktree at file_path. In the index,
1406 * only record the file at dest->path in the appropriate
1409 if (update_file(opt
, 0, dest
, file_path
))
1411 if (file_path
!= dest
->path
)
1413 if (update_stages(opt
, dest
->path
, NULL
,
1414 ren
->branch
== opt
->branch1
? dest
: NULL
,
1415 ren
->branch
== opt
->branch1
? NULL
: dest
))
1417 return 0; /* not clean, but conflicted */
1419 /* Update dest->path both in index and in worktree */
1420 if (update_file(opt
, 1, dest
, dest
->path
))
1422 return 1; /* clean */
1426 static int handle_change_delete(struct merge_options
*opt
,
1427 const char *path
, const char *old_path
,
1428 const struct diff_filespec
*o
,
1429 const struct diff_filespec
*changed
,
1430 const char *change_branch
,
1431 const char *delete_branch
,
1432 const char *change
, const char *change_past
)
1434 char *alt_path
= NULL
;
1435 const char *update_path
= path
;
1438 if (dir_in_way(opt
->repo
->index
, path
, !opt
->call_depth
, 0) ||
1439 (!opt
->call_depth
&& would_lose_untracked(opt
, path
))) {
1440 update_path
= alt_path
= unique_path(opt
, path
, change_branch
);
1443 if (opt
->call_depth
) {
1445 * We cannot arbitrarily accept either a_sha or b_sha as
1446 * correct; since there is no true "middle point" between
1447 * them, simply reuse the base version for virtual merge base.
1449 ret
= remove_file_from_index(opt
->repo
->index
, path
);
1451 ret
= update_file(opt
, 0, o
, update_path
);
1454 * Despite the four nearly duplicate messages and argument
1455 * lists below and the ugliness of the nested if-statements,
1456 * having complete messages makes the job easier for
1459 * The slight variance among the cases is due to the fact
1461 * 1) directory/file conflicts (in effect if
1462 * !alt_path) could cause us to need to write the
1463 * file to a different path.
1464 * 2) renames (in effect if !old_path) could mean that
1465 * there are two names for the path that the user
1466 * may know the file by.
1470 output(opt
, 1, _("CONFLICT (%s/delete): %s deleted in %s "
1471 "and %s in %s. Version %s of %s left in tree."),
1472 change
, path
, delete_branch
, change_past
,
1473 change_branch
, change_branch
, path
);
1475 output(opt
, 1, _("CONFLICT (%s/delete): %s deleted in %s "
1476 "and %s to %s in %s. Version %s of %s left in tree."),
1477 change
, old_path
, delete_branch
, change_past
, path
,
1478 change_branch
, change_branch
, path
);
1482 output(opt
, 1, _("CONFLICT (%s/delete): %s deleted in %s "
1483 "and %s in %s. Version %s of %s left in tree at %s."),
1484 change
, path
, delete_branch
, change_past
,
1485 change_branch
, change_branch
, path
, alt_path
);
1487 output(opt
, 1, _("CONFLICT (%s/delete): %s deleted in %s "
1488 "and %s to %s in %s. Version %s of %s left in tree at %s."),
1489 change
, old_path
, delete_branch
, change_past
, path
,
1490 change_branch
, change_branch
, path
, alt_path
);
1494 * No need to call update_file() on path when change_branch ==
1495 * opt->branch1 && !alt_path, since that would needlessly touch
1496 * path. We could call update_file_flags() with update_cache=0
1497 * and update_wd=0, but that's a no-op.
1499 if (change_branch
!= opt
->branch1
|| alt_path
)
1500 ret
= update_file(opt
, 0, changed
, update_path
);
1507 static int handle_rename_delete(struct merge_options
*opt
,
1508 struct rename_conflict_info
*ci
)
1510 const struct rename
*ren
= ci
->ren1
;
1511 const struct diff_filespec
*orig
= ren
->pair
->one
;
1512 const struct diff_filespec
*dest
= ren
->pair
->two
;
1513 const char *rename_branch
= ren
->branch
;
1514 const char *delete_branch
= (opt
->branch1
== ren
->branch
?
1515 opt
->branch2
: opt
->branch1
);
1517 if (handle_change_delete(opt
,
1518 opt
->call_depth
? orig
->path
: dest
->path
,
1519 opt
->call_depth
? NULL
: orig
->path
,
1521 rename_branch
, delete_branch
,
1522 _("rename"), _("renamed")))
1525 if (opt
->call_depth
)
1526 return remove_file_from_index(opt
->repo
->index
, dest
->path
);
1528 return update_stages(opt
, dest
->path
, NULL
,
1529 rename_branch
== opt
->branch1
? dest
: NULL
,
1530 rename_branch
== opt
->branch1
? NULL
: dest
);
1533 static int handle_file_collision(struct merge_options
*opt
,
1534 const char *collide_path
,
1535 const char *prev_path1
,
1536 const char *prev_path2
,
1537 const char *branch1
, const char *branch2
,
1538 struct diff_filespec
*a
,
1539 struct diff_filespec
*b
)
1541 struct merge_file_info mfi
;
1542 struct diff_filespec null
;
1543 char *alt_path
= NULL
;
1544 const char *update_path
= collide_path
;
1547 * It's easiest to get the correct things into stage 2 and 3, and
1548 * to make sure that the content merge puts HEAD before the other
1549 * branch if we just ensure that branch1 == opt->branch1. So, simply
1550 * flip arguments around if we don't have that.
1552 if (branch1
!= opt
->branch1
) {
1553 return handle_file_collision(opt
, collide_path
,
1554 prev_path2
, prev_path1
,
1560 * In the recursive case, we just opt to undo renames
1562 if (opt
->call_depth
&& (prev_path1
|| prev_path2
)) {
1563 /* Put first file (a->oid, a->mode) in its original spot */
1565 if (update_file(opt
, 1, a
, prev_path1
))
1568 if (update_file(opt
, 1, a
, collide_path
))
1572 /* Put second file (b->oid, b->mode) in its original spot */
1574 if (update_file(opt
, 1, b
, prev_path2
))
1577 if (update_file(opt
, 1, b
, collide_path
))
1581 /* Don't leave something at collision path if unrenaming both */
1582 if (prev_path1
&& prev_path2
)
1583 remove_file(opt
, 1, collide_path
, 0);
1588 /* Remove rename sources if rename/add or rename/rename(2to1) */
1590 remove_file(opt
, 1, prev_path1
,
1591 opt
->call_depth
|| would_lose_untracked(opt
, prev_path1
));
1593 remove_file(opt
, 1, prev_path2
,
1594 opt
->call_depth
|| would_lose_untracked(opt
, prev_path2
));
1597 * Remove the collision path, if it wouldn't cause dirty contents
1598 * or an untracked file to get lost. We'll either overwrite with
1599 * merged contents, or just write out to differently named files.
1601 if (was_dirty(opt
, collide_path
)) {
1602 output(opt
, 1, _("Refusing to lose dirty file at %s"),
1604 update_path
= alt_path
= unique_path(opt
, collide_path
, "merged");
1605 } else if (would_lose_untracked(opt
, collide_path
)) {
1607 * Only way we get here is if both renames were from
1608 * a directory rename AND user had an untracked file
1609 * at the location where both files end up after the
1610 * two directory renames. See testcase 10d of t6043.
1612 output(opt
, 1, _("Refusing to lose untracked file at "
1613 "%s, even though it's in the way."),
1615 update_path
= alt_path
= unique_path(opt
, collide_path
, "merged");
1618 * FIXME: It's possible that the two files are identical
1619 * and that the current working copy happens to match, in
1620 * which case we are unnecessarily touching the working
1621 * tree file. It's not a likely enough scenario that I
1622 * want to code up the checks for it and a better fix is
1623 * available if we restructure how unpack_trees() and
1624 * merge-recursive interoperate anyway, so punting for
1627 remove_file(opt
, 0, collide_path
, 0);
1630 /* Store things in diff_filespecs for functions that need it */
1631 null
.path
= (char *)collide_path
;
1632 oidcpy(&null
.oid
, &null_oid
);
1635 if (merge_mode_and_contents(opt
, &null
, a
, b
, collide_path
,
1636 branch1
, branch2
, opt
->call_depth
* 2, &mfi
))
1638 mfi
.clean
&= !alt_path
;
1639 if (update_file(opt
, mfi
.clean
, &mfi
.blob
, update_path
))
1641 if (!mfi
.clean
&& !opt
->call_depth
&&
1642 update_stages(opt
, collide_path
, NULL
, a
, b
))
1646 * FIXME: If both a & b both started with conflicts (only possible
1647 * if they came from a rename/rename(2to1)), but had IDENTICAL
1648 * contents including those conflicts, then in the next line we claim
1649 * it was clean. If someone cares about this case, we should have the
1650 * caller notify us if we started with conflicts.
1655 static int handle_rename_add(struct merge_options
*opt
,
1656 struct rename_conflict_info
*ci
)
1658 /* a was renamed to c, and a separate c was added. */
1659 struct diff_filespec
*a
= ci
->ren1
->pair
->one
;
1660 struct diff_filespec
*c
= ci
->ren1
->pair
->two
;
1661 char *path
= c
->path
;
1662 char *prev_path_desc
;
1663 struct merge_file_info mfi
;
1665 const char *rename_branch
= ci
->ren1
->branch
;
1666 const char *add_branch
= (opt
->branch1
== rename_branch
?
1667 opt
->branch2
: opt
->branch1
);
1668 int other_stage
= (ci
->ren1
->branch
== opt
->branch1
? 3 : 2);
1670 output(opt
, 1, _("CONFLICT (rename/add): "
1671 "Rename %s->%s in %s. Added %s in %s"),
1672 a
->path
, c
->path
, rename_branch
,
1673 c
->path
, add_branch
);
1675 prev_path_desc
= xstrfmt("version of %s from %s", path
, a
->path
);
1676 ci
->ren1
->src_entry
->stages
[other_stage
].path
= a
->path
;
1677 if (merge_mode_and_contents(opt
, a
, c
,
1678 &ci
->ren1
->src_entry
->stages
[other_stage
],
1680 opt
->branch1
, opt
->branch2
,
1681 1 + opt
->call_depth
* 2, &mfi
))
1683 free(prev_path_desc
);
1685 ci
->ren1
->dst_entry
->stages
[other_stage
].path
= mfi
.blob
.path
= c
->path
;
1686 return handle_file_collision(opt
,
1687 c
->path
, a
->path
, NULL
,
1688 rename_branch
, add_branch
,
1690 &ci
->ren1
->dst_entry
->stages
[other_stage
]);
1693 static char *find_path_for_conflict(struct merge_options
*opt
,
1695 const char *branch1
,
1696 const char *branch2
)
1698 char *new_path
= NULL
;
1699 if (dir_in_way(opt
->repo
->index
, path
, !opt
->call_depth
, 0)) {
1700 new_path
= unique_path(opt
, path
, branch1
);
1701 output(opt
, 1, _("%s is a directory in %s adding "
1703 path
, branch2
, new_path
);
1704 } else if (would_lose_untracked(opt
, path
)) {
1705 new_path
= unique_path(opt
, path
, branch1
);
1706 output(opt
, 1, _("Refusing to lose untracked file"
1707 " at %s; adding as %s instead"),
1714 static int handle_rename_rename_1to2(struct merge_options
*opt
,
1715 struct rename_conflict_info
*ci
)
1717 /* One file was renamed in both branches, but to different names. */
1718 struct merge_file_info mfi
;
1719 struct diff_filespec
*add
;
1720 struct diff_filespec
*o
= ci
->ren1
->pair
->one
;
1721 struct diff_filespec
*a
= ci
->ren1
->pair
->two
;
1722 struct diff_filespec
*b
= ci
->ren2
->pair
->two
;
1725 output(opt
, 1, _("CONFLICT (rename/rename): "
1726 "Rename \"%s\"->\"%s\" in branch \"%s\" "
1727 "rename \"%s\"->\"%s\" in \"%s\"%s"),
1728 o
->path
, a
->path
, ci
->ren1
->branch
,
1729 o
->path
, b
->path
, ci
->ren2
->branch
,
1730 opt
->call_depth
? _(" (left unresolved)") : "");
1732 path_desc
= xstrfmt("%s and %s, both renamed from %s",
1733 a
->path
, b
->path
, o
->path
);
1734 if (merge_mode_and_contents(opt
, o
, a
, b
, path_desc
,
1735 ci
->ren1
->branch
, ci
->ren2
->branch
,
1736 opt
->call_depth
* 2, &mfi
))
1740 if (opt
->call_depth
) {
1742 * FIXME: For rename/add-source conflicts (if we could detect
1743 * such), this is wrong. We should instead find a unique
1744 * pathname and then either rename the add-source file to that
1745 * unique path, or use that unique path instead of src here.
1747 if (update_file(opt
, 0, &mfi
.blob
, o
->path
))
1751 * Above, we put the merged content at the merge-base's
1752 * path. Now we usually need to delete both a->path and
1753 * b->path. However, the rename on each side of the merge
1754 * could also be involved in a rename/add conflict. In
1755 * such cases, we should keep the added file around,
1756 * resolving the conflict at that path in its favor.
1758 add
= &ci
->ren1
->dst_entry
->stages
[2 ^ 1];
1759 if (is_valid(add
)) {
1760 if (update_file(opt
, 0, add
, a
->path
))
1764 remove_file_from_index(opt
->repo
->index
, a
->path
);
1765 add
= &ci
->ren2
->dst_entry
->stages
[3 ^ 1];
1766 if (is_valid(add
)) {
1767 if (update_file(opt
, 0, add
, b
->path
))
1771 remove_file_from_index(opt
->repo
->index
, b
->path
);
1774 * For each destination path, we need to see if there is a
1775 * rename/add collision. If not, we can write the file out
1776 * to the specified location.
1778 add
= &ci
->ren1
->dst_entry
->stages
[2 ^ 1];
1779 if (is_valid(add
)) {
1780 add
->path
= mfi
.blob
.path
= a
->path
;
1781 if (handle_file_collision(opt
, a
->path
,
1785 &mfi
.blob
, add
) < 0)
1788 char *new_path
= find_path_for_conflict(opt
, a
->path
,
1791 if (update_file(opt
, 0, &mfi
.blob
,
1792 new_path
? new_path
: a
->path
))
1795 if (update_stages(opt
, a
->path
, NULL
, a
, NULL
))
1799 add
= &ci
->ren2
->dst_entry
->stages
[3 ^ 1];
1800 if (is_valid(add
)) {
1801 add
->path
= mfi
.blob
.path
= b
->path
;
1802 if (handle_file_collision(opt
, b
->path
,
1806 add
, &mfi
.blob
) < 0)
1809 char *new_path
= find_path_for_conflict(opt
, b
->path
,
1812 if (update_file(opt
, 0, &mfi
.blob
,
1813 new_path
? new_path
: b
->path
))
1816 if (update_stages(opt
, b
->path
, NULL
, NULL
, b
))
1824 static int handle_rename_rename_2to1(struct merge_options
*opt
,
1825 struct rename_conflict_info
*ci
)
1827 /* Two files, a & b, were renamed to the same thing, c. */
1828 struct diff_filespec
*a
= ci
->ren1
->pair
->one
;
1829 struct diff_filespec
*b
= ci
->ren2
->pair
->one
;
1830 struct diff_filespec
*c1
= ci
->ren1
->pair
->two
;
1831 struct diff_filespec
*c2
= ci
->ren2
->pair
->two
;
1832 char *path
= c1
->path
; /* == c2->path */
1833 char *path_side_1_desc
;
1834 char *path_side_2_desc
;
1835 struct merge_file_info mfi_c1
;
1836 struct merge_file_info mfi_c2
;
1837 int ostage1
, ostage2
;
1839 output(opt
, 1, _("CONFLICT (rename/rename): "
1840 "Rename %s->%s in %s. "
1841 "Rename %s->%s in %s"),
1842 a
->path
, c1
->path
, ci
->ren1
->branch
,
1843 b
->path
, c2
->path
, ci
->ren2
->branch
);
1845 path_side_1_desc
= xstrfmt("version of %s from %s", path
, a
->path
);
1846 path_side_2_desc
= xstrfmt("version of %s from %s", path
, b
->path
);
1847 ostage1
= ci
->ren1
->branch
== opt
->branch1
? 3 : 2;
1848 ostage2
= ostage1
^ 1;
1849 ci
->ren1
->src_entry
->stages
[ostage1
].path
= a
->path
;
1850 ci
->ren2
->src_entry
->stages
[ostage2
].path
= b
->path
;
1851 if (merge_mode_and_contents(opt
, a
, c1
,
1852 &ci
->ren1
->src_entry
->stages
[ostage1
],
1854 opt
->branch1
, opt
->branch2
,
1855 1 + opt
->call_depth
* 2, &mfi_c1
) ||
1856 merge_mode_and_contents(opt
, b
,
1857 &ci
->ren2
->src_entry
->stages
[ostage2
],
1858 c2
, path_side_2_desc
,
1859 opt
->branch1
, opt
->branch2
,
1860 1 + opt
->call_depth
* 2, &mfi_c2
))
1862 free(path_side_1_desc
);
1863 free(path_side_2_desc
);
1864 mfi_c1
.blob
.path
= path
;
1865 mfi_c2
.blob
.path
= path
;
1867 return handle_file_collision(opt
, path
, a
->path
, b
->path
,
1868 ci
->ren1
->branch
, ci
->ren2
->branch
,
1869 &mfi_c1
.blob
, &mfi_c2
.blob
);
1873 * Get the diff_filepairs changed between o_tree and tree.
1875 static struct diff_queue_struct
*get_diffpairs(struct merge_options
*opt
,
1876 struct tree
*o_tree
,
1879 struct diff_queue_struct
*ret
;
1880 struct diff_options opts
;
1882 repo_diff_setup(opt
->repo
, &opts
);
1883 opts
.flags
.recursive
= 1;
1884 opts
.flags
.rename_empty
= 0;
1885 opts
.detect_rename
= merge_detect_rename(opt
);
1887 * We do not have logic to handle the detection of copies. In
1888 * fact, it may not even make sense to add such logic: would we
1889 * really want a change to a base file to be propagated through
1890 * multiple other files by a merge?
1892 if (opts
.detect_rename
> DIFF_DETECT_RENAME
)
1893 opts
.detect_rename
= DIFF_DETECT_RENAME
;
1894 opts
.rename_limit
= opt
->merge_rename_limit
>= 0 ? opt
->merge_rename_limit
:
1895 opt
->diff_rename_limit
>= 0 ? opt
->diff_rename_limit
:
1897 opts
.rename_score
= opt
->rename_score
;
1898 opts
.show_rename_progress
= opt
->show_rename_progress
;
1899 opts
.output_format
= DIFF_FORMAT_NO_OUTPUT
;
1900 diff_setup_done(&opts
);
1901 diff_tree_oid(&o_tree
->object
.oid
, &tree
->object
.oid
, "", &opts
);
1902 diffcore_std(&opts
);
1903 if (opts
.needed_rename_limit
> opt
->needed_rename_limit
)
1904 opt
->needed_rename_limit
= opts
.needed_rename_limit
;
1906 ret
= xmalloc(sizeof(*ret
));
1907 *ret
= diff_queued_diff
;
1909 opts
.output_format
= DIFF_FORMAT_NO_OUTPUT
;
1910 diff_queued_diff
.nr
= 0;
1911 diff_queued_diff
.queue
= NULL
;
1916 static int tree_has_path(struct repository
*r
, struct tree
*tree
,
1919 struct object_id hashy
;
1920 unsigned short mode_o
;
1922 return !get_tree_entry(r
,
1923 &tree
->object
.oid
, path
,
1928 * Return a new string that replaces the beginning portion (which matches
1929 * entry->dir), with entry->new_dir. In perl-speak:
1930 * new_path_name = (old_path =~ s/entry->dir/entry->new_dir/);
1932 * Caller must ensure that old_path starts with entry->dir + '/'.
1934 static char *apply_dir_rename(struct dir_rename_entry
*entry
,
1935 const char *old_path
)
1937 struct strbuf new_path
= STRBUF_INIT
;
1940 if (entry
->non_unique_new_dir
)
1943 oldlen
= strlen(entry
->dir
);
1944 newlen
= entry
->new_dir
.len
+ (strlen(old_path
) - oldlen
) + 1;
1945 strbuf_grow(&new_path
, newlen
);
1946 strbuf_addbuf(&new_path
, &entry
->new_dir
);
1947 strbuf_addstr(&new_path
, &old_path
[oldlen
]);
1949 return strbuf_detach(&new_path
, NULL
);
1952 static void get_renamed_dir_portion(const char *old_path
, const char *new_path
,
1953 char **old_dir
, char **new_dir
)
1955 char *end_of_old
, *end_of_new
;
1956 int old_len
, new_len
;
1963 * "a/b/c/d/e/foo.c" -> "a/b/some/thing/else/e/foo.c"
1964 * the "e/foo.c" part is the same, we just want to know that
1965 * "a/b/c/d" was renamed to "a/b/some/thing/else"
1966 * so, for this example, this function returns "a/b/c/d" in
1967 * *old_dir and "a/b/some/thing/else" in *new_dir.
1969 * Also, if the basename of the file changed, we don't care. We
1970 * want to know which portion of the directory, if any, changed.
1972 end_of_old
= strrchr(old_path
, '/');
1973 end_of_new
= strrchr(new_path
, '/');
1975 if (end_of_old
== NULL
|| end_of_new
== NULL
)
1977 while (*--end_of_new
== *--end_of_old
&&
1978 end_of_old
!= old_path
&&
1979 end_of_new
!= new_path
)
1980 ; /* Do nothing; all in the while loop */
1982 * We've found the first non-matching character in the directory
1983 * paths. That means the current directory we were comparing
1984 * represents the rename. Move end_of_old and end_of_new back
1985 * to the full directory name.
1987 if (*end_of_old
== '/')
1989 if (*end_of_old
!= '/')
1991 end_of_old
= strchr(end_of_old
, '/');
1992 end_of_new
= strchr(end_of_new
, '/');
1995 * It may have been the case that old_path and new_path were the same
1996 * directory all along. Don't claim a rename if they're the same.
1998 old_len
= end_of_old
- old_path
;
1999 new_len
= end_of_new
- new_path
;
2001 if (old_len
!= new_len
|| strncmp(old_path
, new_path
, old_len
)) {
2002 *old_dir
= xstrndup(old_path
, old_len
);
2003 *new_dir
= xstrndup(new_path
, new_len
);
2007 static void remove_hashmap_entries(struct hashmap
*dir_renames
,
2008 struct string_list
*items_to_remove
)
2011 struct dir_rename_entry
*entry
;
2013 for (i
= 0; i
< items_to_remove
->nr
; i
++) {
2014 entry
= items_to_remove
->items
[i
].util
;
2015 hashmap_remove(dir_renames
, &entry
->ent
, NULL
);
2017 string_list_clear(items_to_remove
, 0);
2021 * See if there is a directory rename for path, and if there are any file
2022 * level conflicts for the renamed location. If there is a rename and
2023 * there are no conflicts, return the new name. Otherwise, return NULL.
2025 static char *handle_path_level_conflicts(struct merge_options
*opt
,
2027 struct dir_rename_entry
*entry
,
2028 struct hashmap
*collisions
,
2031 char *new_path
= NULL
;
2032 struct collision_entry
*collision_ent
;
2034 struct strbuf collision_paths
= STRBUF_INIT
;
2037 * entry has the mapping of old directory name to new directory name
2038 * that we want to apply to path.
2040 new_path
= apply_dir_rename(entry
, path
);
2043 /* This should only happen when entry->non_unique_new_dir set */
2044 if (!entry
->non_unique_new_dir
)
2045 BUG("entry->non_unqiue_dir not set and !new_path");
2046 output(opt
, 1, _("CONFLICT (directory rename split): "
2047 "Unclear where to place %s because directory "
2048 "%s was renamed to multiple other directories, "
2049 "with no destination getting a majority of the "
2057 * The caller needs to have ensured that it has pre-populated
2058 * collisions with all paths that map to new_path. Do a quick check
2059 * to ensure that's the case.
2061 collision_ent
= collision_find_entry(collisions
, new_path
);
2062 if (collision_ent
== NULL
)
2063 BUG("collision_ent is NULL");
2066 * Check for one-sided add/add/.../add conflicts, i.e.
2067 * where implicit renames from the other side doing
2068 * directory rename(s) can affect this side of history
2069 * to put multiple paths into the same location. Warn
2070 * and bail on directory renames for such paths.
2072 if (collision_ent
->reported_already
) {
2074 } else if (tree_has_path(opt
->repo
, tree
, new_path
)) {
2075 collision_ent
->reported_already
= 1;
2076 strbuf_add_separated_string_list(&collision_paths
, ", ",
2077 &collision_ent
->source_files
);
2078 output(opt
, 1, _("CONFLICT (implicit dir rename): Existing "
2079 "file/dir at %s in the way of implicit "
2080 "directory rename(s) putting the following "
2081 "path(s) there: %s."),
2082 new_path
, collision_paths
.buf
);
2084 } else if (collision_ent
->source_files
.nr
> 1) {
2085 collision_ent
->reported_already
= 1;
2086 strbuf_add_separated_string_list(&collision_paths
, ", ",
2087 &collision_ent
->source_files
);
2088 output(opt
, 1, _("CONFLICT (implicit dir rename): Cannot map "
2089 "more than one path to %s; implicit directory "
2090 "renames tried to put these paths there: %s"),
2091 new_path
, collision_paths
.buf
);
2095 /* Free memory we no longer need */
2096 strbuf_release(&collision_paths
);
2097 if (!clean
&& new_path
) {
2106 * There are a couple things we want to do at the directory level:
2107 * 1. Check for both sides renaming to the same thing, in order to avoid
2108 * implicit renaming of files that should be left in place. (See
2109 * testcase 6b in t6043 for details.)
2110 * 2. Prune directory renames if there are still files left in the
2111 * the original directory. These represent a partial directory rename,
2112 * i.e. a rename where only some of the files within the directory
2113 * were renamed elsewhere. (Technically, this could be done earlier
2114 * in get_directory_renames(), except that would prevent us from
2115 * doing the previous check and thus failing testcase 6b.)
2116 * 3. Check for rename/rename(1to2) conflicts (at the directory level).
2117 * In the future, we could potentially record this info as well and
2118 * omit reporting rename/rename(1to2) conflicts for each path within
2119 * the affected directories, thus cleaning up the merge output.
2120 * NOTE: We do NOT check for rename/rename(2to1) conflicts at the
2121 * directory level, because merging directories is fine. If it
2122 * causes conflicts for files within those merged directories, then
2123 * that should be detected at the individual path level.
2125 static void handle_directory_level_conflicts(struct merge_options
*opt
,
2126 struct hashmap
*dir_re_head
,
2128 struct hashmap
*dir_re_merge
,
2131 struct hashmap_iter iter
;
2132 struct dir_rename_entry
*head_ent
;
2133 struct dir_rename_entry
*merge_ent
;
2135 struct string_list remove_from_head
= STRING_LIST_INIT_NODUP
;
2136 struct string_list remove_from_merge
= STRING_LIST_INIT_NODUP
;
2138 hashmap_iter_init(dir_re_head
, &iter
);
2139 while ((head_ent
= hashmap_iter_next(&iter
))) {
2140 merge_ent
= dir_rename_find_entry(dir_re_merge
, head_ent
->dir
);
2142 !head_ent
->non_unique_new_dir
&&
2143 !merge_ent
->non_unique_new_dir
&&
2144 !strbuf_cmp(&head_ent
->new_dir
, &merge_ent
->new_dir
)) {
2145 /* 1. Renamed identically; remove it from both sides */
2146 string_list_append(&remove_from_head
,
2147 head_ent
->dir
)->util
= head_ent
;
2148 strbuf_release(&head_ent
->new_dir
);
2149 string_list_append(&remove_from_merge
,
2150 merge_ent
->dir
)->util
= merge_ent
;
2151 strbuf_release(&merge_ent
->new_dir
);
2152 } else if (tree_has_path(opt
->repo
, head
, head_ent
->dir
)) {
2153 /* 2. This wasn't a directory rename after all */
2154 string_list_append(&remove_from_head
,
2155 head_ent
->dir
)->util
= head_ent
;
2156 strbuf_release(&head_ent
->new_dir
);
2160 remove_hashmap_entries(dir_re_head
, &remove_from_head
);
2161 remove_hashmap_entries(dir_re_merge
, &remove_from_merge
);
2163 hashmap_iter_init(dir_re_merge
, &iter
);
2164 while ((merge_ent
= hashmap_iter_next(&iter
))) {
2165 head_ent
= dir_rename_find_entry(dir_re_head
, merge_ent
->dir
);
2166 if (tree_has_path(opt
->repo
, merge
, merge_ent
->dir
)) {
2167 /* 2. This wasn't a directory rename after all */
2168 string_list_append(&remove_from_merge
,
2169 merge_ent
->dir
)->util
= merge_ent
;
2170 } else if (head_ent
&&
2171 !head_ent
->non_unique_new_dir
&&
2172 !merge_ent
->non_unique_new_dir
) {
2173 /* 3. rename/rename(1to2) */
2175 * We can assume it's not rename/rename(1to1) because
2176 * that was case (1), already checked above. So we
2177 * know that head_ent->new_dir and merge_ent->new_dir
2178 * are different strings.
2180 output(opt
, 1, _("CONFLICT (rename/rename): "
2181 "Rename directory %s->%s in %s. "
2182 "Rename directory %s->%s in %s"),
2183 head_ent
->dir
, head_ent
->new_dir
.buf
, opt
->branch1
,
2184 head_ent
->dir
, merge_ent
->new_dir
.buf
, opt
->branch2
);
2185 string_list_append(&remove_from_head
,
2186 head_ent
->dir
)->util
= head_ent
;
2187 strbuf_release(&head_ent
->new_dir
);
2188 string_list_append(&remove_from_merge
,
2189 merge_ent
->dir
)->util
= merge_ent
;
2190 strbuf_release(&merge_ent
->new_dir
);
2194 remove_hashmap_entries(dir_re_head
, &remove_from_head
);
2195 remove_hashmap_entries(dir_re_merge
, &remove_from_merge
);
2198 static struct hashmap
*get_directory_renames(struct diff_queue_struct
*pairs
)
2200 struct hashmap
*dir_renames
;
2201 struct hashmap_iter iter
;
2202 struct dir_rename_entry
*entry
;
2206 * Typically, we think of a directory rename as all files from a
2207 * certain directory being moved to a target directory. However,
2208 * what if someone first moved two files from the original
2209 * directory in one commit, and then renamed the directory
2210 * somewhere else in a later commit? At merge time, we just know
2211 * that files from the original directory went to two different
2212 * places, and that the bulk of them ended up in the same place.
2213 * We want each directory rename to represent where the bulk of the
2214 * files from that directory end up; this function exists to find
2215 * where the bulk of the files went.
2217 * The first loop below simply iterates through the list of file
2218 * renames, finding out how often each directory rename pair
2219 * possibility occurs.
2221 dir_renames
= xmalloc(sizeof(*dir_renames
));
2222 dir_rename_init(dir_renames
);
2223 for (i
= 0; i
< pairs
->nr
; ++i
) {
2224 struct string_list_item
*item
;
2226 struct diff_filepair
*pair
= pairs
->queue
[i
];
2227 char *old_dir
, *new_dir
;
2229 /* File not part of directory rename if it wasn't renamed */
2230 if (pair
->status
!= 'R')
2233 get_renamed_dir_portion(pair
->one
->path
, pair
->two
->path
,
2234 &old_dir
, &new_dir
);
2236 /* Directory didn't change at all; ignore this one. */
2239 entry
= dir_rename_find_entry(dir_renames
, old_dir
);
2241 entry
= xmalloc(sizeof(*entry
));
2242 dir_rename_entry_init(entry
, old_dir
);
2243 hashmap_put(dir_renames
, &entry
->ent
);
2247 item
= string_list_lookup(&entry
->possible_new_dirs
, new_dir
);
2249 item
= string_list_insert(&entry
->possible_new_dirs
,
2251 item
->util
= xcalloc(1, sizeof(int));
2260 * For each directory with files moved out of it, we find out which
2261 * target directory received the most files so we can declare it to
2262 * be the "winning" target location for the directory rename. This
2263 * winner gets recorded in new_dir. If there is no winner
2264 * (multiple target directories received the same number of files),
2265 * we set non_unique_new_dir. Once we've determined the winner (or
2266 * that there is no winner), we no longer need possible_new_dirs.
2268 hashmap_iter_init(dir_renames
, &iter
);
2269 while ((entry
= hashmap_iter_next(&iter
))) {
2274 for (i
= 0; i
< entry
->possible_new_dirs
.nr
; i
++) {
2275 int *count
= entry
->possible_new_dirs
.items
[i
].util
;
2279 else if (*count
> max
) {
2281 best
= entry
->possible_new_dirs
.items
[i
].string
;
2285 entry
->non_unique_new_dir
= 1;
2287 assert(entry
->new_dir
.len
== 0);
2288 strbuf_addstr(&entry
->new_dir
, best
);
2291 * The relevant directory sub-portion of the original full
2292 * filepaths were xstrndup'ed before inserting into
2293 * possible_new_dirs, and instead of manually iterating the
2294 * list and free'ing each, just lie and tell
2295 * possible_new_dirs that it did the strdup'ing so that it
2296 * will free them for us.
2298 entry
->possible_new_dirs
.strdup_strings
= 1;
2299 string_list_clear(&entry
->possible_new_dirs
, 1);
2305 static struct dir_rename_entry
*check_dir_renamed(const char *path
,
2306 struct hashmap
*dir_renames
)
2308 char *temp
= xstrdup(path
);
2310 struct dir_rename_entry
*entry
= NULL
;
2312 while ((end
= strrchr(temp
, '/'))) {
2314 entry
= dir_rename_find_entry(dir_renames
, temp
);
2322 static void compute_collisions(struct hashmap
*collisions
,
2323 struct hashmap
*dir_renames
,
2324 struct diff_queue_struct
*pairs
)
2329 * Multiple files can be mapped to the same path due to directory
2330 * renames done by the other side of history. Since that other
2331 * side of history could have merged multiple directories into one,
2332 * if our side of history added the same file basename to each of
2333 * those directories, then all N of them would get implicitly
2334 * renamed by the directory rename detection into the same path,
2335 * and we'd get an add/add/.../add conflict, and all those adds
2336 * from *this* side of history. This is not representable in the
2337 * index, and users aren't going to easily be able to make sense of
2338 * it. So we need to provide a good warning about what's
2339 * happening, and fall back to no-directory-rename detection
2340 * behavior for those paths.
2342 * See testcases 9e and all of section 5 from t6043 for examples.
2344 collision_init(collisions
);
2346 for (i
= 0; i
< pairs
->nr
; ++i
) {
2347 struct dir_rename_entry
*dir_rename_ent
;
2348 struct collision_entry
*collision_ent
;
2350 struct diff_filepair
*pair
= pairs
->queue
[i
];
2352 if (pair
->status
!= 'A' && pair
->status
!= 'R')
2354 dir_rename_ent
= check_dir_renamed(pair
->two
->path
,
2356 if (!dir_rename_ent
)
2359 new_path
= apply_dir_rename(dir_rename_ent
, pair
->two
->path
);
2362 * dir_rename_ent->non_unique_new_path is true, which
2363 * means there is no directory rename for us to use,
2364 * which means it won't cause us any additional
2368 collision_ent
= collision_find_entry(collisions
, new_path
);
2369 if (!collision_ent
) {
2370 collision_ent
= xcalloc(1,
2371 sizeof(struct collision_entry
));
2372 hashmap_entry_init(&collision_ent
->ent
,
2374 hashmap_put(collisions
, &collision_ent
->ent
);
2375 collision_ent
->target_file
= new_path
;
2379 string_list_insert(&collision_ent
->source_files
,
2384 static char *check_for_directory_rename(struct merge_options
*opt
,
2387 struct hashmap
*dir_renames
,
2388 struct hashmap
*dir_rename_exclusions
,
2389 struct hashmap
*collisions
,
2392 char *new_path
= NULL
;
2393 struct dir_rename_entry
*entry
= check_dir_renamed(path
, dir_renames
);
2394 struct dir_rename_entry
*oentry
= NULL
;
2400 * This next part is a little weird. We do not want to do an
2401 * implicit rename into a directory we renamed on our side, because
2402 * that will result in a spurious rename/rename(1to2) conflict. An
2404 * Base commit: dumbdir/afile, otherdir/bfile
2405 * Side 1: smrtdir/afile, otherdir/bfile
2406 * Side 2: dumbdir/afile, dumbdir/bfile
2407 * Here, while working on Side 1, we could notice that otherdir was
2408 * renamed/merged to dumbdir, and change the diff_filepair for
2409 * otherdir/bfile into a rename into dumbdir/bfile. However, Side
2410 * 2 will notice the rename from dumbdir to smrtdir, and do the
2411 * transitive rename to move it from dumbdir/bfile to
2412 * smrtdir/bfile. That gives us bfile in dumbdir vs being in
2413 * smrtdir, a rename/rename(1to2) conflict. We really just want
2414 * the file to end up in smrtdir. And the way to achieve that is
2415 * to not let Side1 do the rename to dumbdir, since we know that is
2416 * the source of one of our directory renames.
2418 * That's why oentry and dir_rename_exclusions is here.
2420 * As it turns out, this also prevents N-way transient rename
2421 * confusion; See testcases 9c and 9d of t6043.
2423 oentry
= dir_rename_find_entry(dir_rename_exclusions
, entry
->new_dir
.buf
);
2425 output(opt
, 1, _("WARNING: Avoiding applying %s -> %s rename "
2426 "to %s, because %s itself was renamed."),
2427 entry
->dir
, entry
->new_dir
.buf
, path
, entry
->new_dir
.buf
);
2429 new_path
= handle_path_level_conflicts(opt
, path
, entry
,
2431 *clean_merge
&= (new_path
!= NULL
);
2437 static void apply_directory_rename_modifications(struct merge_options
*opt
,
2438 struct diff_filepair
*pair
,
2442 struct tree
*o_tree
,
2443 struct tree
*a_tree
,
2444 struct tree
*b_tree
,
2445 struct string_list
*entries
)
2447 struct string_list_item
*item
;
2448 int stage
= (tree
== a_tree
? 2 : 3);
2452 * In all cases where we can do directory rename detection,
2453 * unpack_trees() will have read pair->two->path into the
2454 * index and the working copy. We need to remove it so that
2455 * we can instead place it at new_path. It is guaranteed to
2456 * not be untracked (unpack_trees() would have errored out
2457 * saying the file would have been overwritten), but it might
2460 update_wd
= !was_dirty(opt
, pair
->two
->path
);
2462 output(opt
, 1, _("Refusing to lose dirty file at %s"),
2464 remove_file(opt
, 1, pair
->two
->path
, !update_wd
);
2466 /* Find or create a new re->dst_entry */
2467 item
= string_list_lookup(entries
, new_path
);
2470 * Since we're renaming on this side of history, and it's
2471 * due to a directory rename on the other side of history
2472 * (which we only allow when the directory in question no
2473 * longer exists on the other side of history), the
2474 * original entry for re->dst_entry is no longer
2477 re
->dst_entry
->processed
= 1;
2480 * ...because we'll be using this new one.
2482 re
->dst_entry
= item
->util
;
2485 * re->dst_entry is for the before-dir-rename path, and we
2486 * need it to hold information for the after-dir-rename
2487 * path. Before creating a new entry, we need to mark the
2488 * old one as unnecessary (...unless it is shared by
2489 * src_entry, i.e. this didn't use to be a rename, in which
2490 * case we can just allow the normal processing to happen
2493 if (pair
->status
== 'R')
2494 re
->dst_entry
->processed
= 1;
2496 re
->dst_entry
= insert_stage_data(opt
->repo
, new_path
,
2497 o_tree
, a_tree
, b_tree
,
2499 item
= string_list_insert(entries
, new_path
);
2500 item
->util
= re
->dst_entry
;
2504 * Update the stage_data with the information about the path we are
2505 * moving into place. That slot will be empty and available for us
2506 * to write to because of the collision checks in
2507 * handle_path_level_conflicts(). In other words,
2508 * re->dst_entry->stages[stage].oid will be the null_oid, so it's
2509 * open for us to write to.
2511 * It may be tempting to actually update the index at this point as
2512 * well, using update_stages_for_stage_data(), but as per the big
2513 * "NOTE" in update_stages(), doing so will modify the current
2514 * in-memory index which will break calls to would_lose_untracked()
2515 * that we need to make. Instead, we need to just make sure that
2516 * the various handle_rename_*() functions update the index
2517 * explicitly rather than relying on unpack_trees() to have done it.
2519 get_tree_entry(opt
->repo
,
2522 &re
->dst_entry
->stages
[stage
].oid
,
2523 &re
->dst_entry
->stages
[stage
].mode
);
2526 * Record the original change status (or 'type' of change). If it
2527 * was originally an add ('A'), this lets us differentiate later
2528 * between a RENAME_DELETE conflict and RENAME_VIA_DIR (they
2529 * otherwise look the same). If it was originally a rename ('R'),
2530 * this lets us remember and report accurately about the transitive
2531 * renaming that occurred via the directory rename detection. Also,
2532 * record the original destination name.
2534 re
->dir_rename_original_type
= pair
->status
;
2535 re
->dir_rename_original_dest
= pair
->two
->path
;
2538 * We don't actually look at pair->status again, but it seems
2539 * pedagogically correct to adjust it.
2544 * Finally, record the new location.
2546 pair
->two
->path
= new_path
;
2550 * Get information of all renames which occurred in 'pairs', making use of
2551 * any implicit directory renames inferred from the other side of history.
2552 * We need the three trees in the merge ('o_tree', 'a_tree' and 'b_tree')
2553 * to be able to associate the correct cache entries with the rename
2554 * information; tree is always equal to either a_tree or b_tree.
2556 static struct string_list
*get_renames(struct merge_options
*opt
,
2558 struct diff_queue_struct
*pairs
,
2559 struct hashmap
*dir_renames
,
2560 struct hashmap
*dir_rename_exclusions
,
2562 struct tree
*o_tree
,
2563 struct tree
*a_tree
,
2564 struct tree
*b_tree
,
2565 struct string_list
*entries
,
2569 struct hashmap collisions
;
2570 struct hashmap_iter iter
;
2571 struct collision_entry
*e
;
2572 struct string_list
*renames
;
2574 compute_collisions(&collisions
, dir_renames
, pairs
);
2575 renames
= xcalloc(1, sizeof(struct string_list
));
2577 for (i
= 0; i
< pairs
->nr
; ++i
) {
2578 struct string_list_item
*item
;
2580 struct diff_filepair
*pair
= pairs
->queue
[i
];
2581 char *new_path
; /* non-NULL only with directory renames */
2583 if (pair
->status
!= 'A' && pair
->status
!= 'R') {
2584 diff_free_filepair(pair
);
2587 new_path
= check_for_directory_rename(opt
, pair
->two
->path
, tree
,
2589 dir_rename_exclusions
,
2592 if (pair
->status
!= 'R' && !new_path
) {
2593 diff_free_filepair(pair
);
2597 re
= xmalloc(sizeof(*re
));
2600 re
->branch
= branch
;
2601 re
->dir_rename_original_type
= '\0';
2602 re
->dir_rename_original_dest
= NULL
;
2603 item
= string_list_lookup(entries
, re
->pair
->one
->path
);
2605 re
->src_entry
= insert_stage_data(opt
->repo
,
2606 re
->pair
->one
->path
,
2607 o_tree
, a_tree
, b_tree
, entries
);
2609 re
->src_entry
= item
->util
;
2611 item
= string_list_lookup(entries
, re
->pair
->two
->path
);
2613 re
->dst_entry
= insert_stage_data(opt
->repo
,
2614 re
->pair
->two
->path
,
2615 o_tree
, a_tree
, b_tree
, entries
);
2617 re
->dst_entry
= item
->util
;
2618 item
= string_list_insert(renames
, pair
->one
->path
);
2621 apply_directory_rename_modifications(opt
, pair
, new_path
,
2627 hashmap_iter_init(&collisions
, &iter
);
2628 while ((e
= hashmap_iter_next(&iter
))) {
2629 free(e
->target_file
);
2630 string_list_clear(&e
->source_files
, 0);
2632 hashmap_free(&collisions
, 1);
2636 static int process_renames(struct merge_options
*opt
,
2637 struct string_list
*a_renames
,
2638 struct string_list
*b_renames
)
2640 int clean_merge
= 1, i
, j
;
2641 struct string_list a_by_dst
= STRING_LIST_INIT_NODUP
;
2642 struct string_list b_by_dst
= STRING_LIST_INIT_NODUP
;
2643 const struct rename
*sre
;
2645 for (i
= 0; i
< a_renames
->nr
; i
++) {
2646 sre
= a_renames
->items
[i
].util
;
2647 string_list_insert(&a_by_dst
, sre
->pair
->two
->path
)->util
2650 for (i
= 0; i
< b_renames
->nr
; i
++) {
2651 sre
= b_renames
->items
[i
].util
;
2652 string_list_insert(&b_by_dst
, sre
->pair
->two
->path
)->util
2656 for (i
= 0, j
= 0; i
< a_renames
->nr
|| j
< b_renames
->nr
;) {
2657 struct string_list
*renames1
, *renames2Dst
;
2658 struct rename
*ren1
= NULL
, *ren2
= NULL
;
2659 const char *ren1_src
, *ren1_dst
;
2660 struct string_list_item
*lookup
;
2662 if (i
>= a_renames
->nr
) {
2663 ren2
= b_renames
->items
[j
++].util
;
2664 } else if (j
>= b_renames
->nr
) {
2665 ren1
= a_renames
->items
[i
++].util
;
2667 int compare
= strcmp(a_renames
->items
[i
].string
,
2668 b_renames
->items
[j
].string
);
2670 ren1
= a_renames
->items
[i
++].util
;
2672 ren2
= b_renames
->items
[j
++].util
;
2675 /* TODO: refactor, so that 1/2 are not needed */
2677 renames1
= a_renames
;
2678 renames2Dst
= &b_by_dst
;
2680 renames1
= b_renames
;
2681 renames2Dst
= &a_by_dst
;
2685 if (ren1
->processed
)
2687 ren1
->processed
= 1;
2688 ren1
->dst_entry
->processed
= 1;
2689 /* BUG: We should only mark src_entry as processed if we
2690 * are not dealing with a rename + add-source case.
2692 ren1
->src_entry
->processed
= 1;
2694 ren1_src
= ren1
->pair
->one
->path
;
2695 ren1_dst
= ren1
->pair
->two
->path
;
2698 /* One file renamed on both sides */
2699 const char *ren2_src
= ren2
->pair
->one
->path
;
2700 const char *ren2_dst
= ren2
->pair
->two
->path
;
2701 enum rename_type rename_type
;
2702 if (strcmp(ren1_src
, ren2_src
) != 0)
2703 BUG("ren1_src != ren2_src");
2704 ren2
->dst_entry
->processed
= 1;
2705 ren2
->processed
= 1;
2706 if (strcmp(ren1_dst
, ren2_dst
) != 0) {
2707 rename_type
= RENAME_ONE_FILE_TO_TWO
;
2710 rename_type
= RENAME_ONE_FILE_TO_ONE
;
2711 /* BUG: We should only remove ren1_src in
2712 * the base stage (think of rename +
2713 * add-source cases).
2715 remove_file(opt
, 1, ren1_src
, 1);
2716 update_entry(ren1
->dst_entry
,
2721 setup_rename_conflict_info(rename_type
, opt
, ren1
, ren2
);
2722 } else if ((lookup
= string_list_lookup(renames2Dst
, ren1_dst
))) {
2723 /* Two different files renamed to the same thing */
2725 ren2
= lookup
->util
;
2726 ren2_dst
= ren2
->pair
->two
->path
;
2727 if (strcmp(ren1_dst
, ren2_dst
) != 0)
2728 BUG("ren1_dst != ren2_dst");
2731 ren2
->processed
= 1;
2733 * BUG: We should only mark src_entry as processed
2734 * if we are not dealing with a rename + add-source
2737 ren2
->src_entry
->processed
= 1;
2739 setup_rename_conflict_info(RENAME_TWO_FILES_TO_ONE
,
2742 /* Renamed in 1, maybe changed in 2 */
2743 /* we only use sha1 and mode of these */
2744 struct diff_filespec src_other
, dst_other
;
2748 * unpack_trees loads entries from common-commit
2749 * into stage 1, from head-commit into stage 2, and
2750 * from merge-commit into stage 3. We keep track
2751 * of which side corresponds to the rename.
2753 int renamed_stage
= a_renames
== renames1
? 2 : 3;
2754 int other_stage
= a_renames
== renames1
? 3 : 2;
2756 /* BUG: We should only remove ren1_src in the base
2757 * stage and in other_stage (think of rename +
2760 remove_file(opt
, 1, ren1_src
,
2761 renamed_stage
== 2 || !was_tracked(opt
, ren1_src
));
2763 oidcpy(&src_other
.oid
,
2764 &ren1
->src_entry
->stages
[other_stage
].oid
);
2765 src_other
.mode
= ren1
->src_entry
->stages
[other_stage
].mode
;
2766 oidcpy(&dst_other
.oid
,
2767 &ren1
->dst_entry
->stages
[other_stage
].oid
);
2768 dst_other
.mode
= ren1
->dst_entry
->stages
[other_stage
].mode
;
2771 if (oid_eq(&src_other
.oid
, &null_oid
) &&
2772 ren1
->dir_rename_original_type
== 'A') {
2773 setup_rename_conflict_info(RENAME_VIA_DIR
,
2775 } else if (oid_eq(&src_other
.oid
, &null_oid
)) {
2776 setup_rename_conflict_info(RENAME_DELETE
,
2778 } else if ((dst_other
.mode
== ren1
->pair
->two
->mode
) &&
2779 oid_eq(&dst_other
.oid
, &ren1
->pair
->two
->oid
)) {
2781 * Added file on the other side identical to
2782 * the file being renamed: clean merge.
2783 * Also, there is no need to overwrite the
2784 * file already in the working copy, so call
2785 * update_file_flags() instead of
2788 if (update_file_flags(opt
,
2791 1, /* update_cache */
2794 } else if (!oid_eq(&dst_other
.oid
, &null_oid
)) {
2796 * Probably not a clean merge, but it's
2797 * premature to set clean_merge to 0 here,
2798 * because if the rename merges cleanly and
2799 * the merge exactly matches the newly added
2800 * file, then the merge will be clean.
2802 setup_rename_conflict_info(RENAME_ADD
,
2807 if (clean_merge
< 0)
2808 goto cleanup_and_return
;
2810 struct diff_filespec
*o
, *a
, *b
;
2811 src_other
.path
= (char *)ren1_src
;
2813 o
= ren1
->pair
->one
;
2814 if (a_renames
== renames1
) {
2815 a
= ren1
->pair
->two
;
2818 b
= ren1
->pair
->two
;
2821 update_entry(ren1
->dst_entry
, o
, a
, b
);
2822 setup_rename_conflict_info(RENAME_NORMAL
,
2828 string_list_clear(&a_by_dst
, 0);
2829 string_list_clear(&b_by_dst
, 0);
2834 struct rename_info
{
2835 struct string_list
*head_renames
;
2836 struct string_list
*merge_renames
;
2839 static void initial_cleanup_rename(struct diff_queue_struct
*pairs
,
2840 struct hashmap
*dir_renames
)
2842 struct hashmap_iter iter
;
2843 struct dir_rename_entry
*e
;
2845 hashmap_iter_init(dir_renames
, &iter
);
2846 while ((e
= hashmap_iter_next(&iter
))) {
2848 strbuf_release(&e
->new_dir
);
2849 /* possible_new_dirs already cleared in get_directory_renames */
2851 hashmap_free(dir_renames
, 1);
2858 static int detect_and_process_renames(struct merge_options
*opt
,
2859 struct tree
*common
,
2862 struct string_list
*entries
,
2863 struct rename_info
*ri
)
2865 struct diff_queue_struct
*head_pairs
, *merge_pairs
;
2866 struct hashmap
*dir_re_head
, *dir_re_merge
;
2869 ri
->head_renames
= NULL
;
2870 ri
->merge_renames
= NULL
;
2872 if (!merge_detect_rename(opt
))
2875 head_pairs
= get_diffpairs(opt
, common
, head
);
2876 merge_pairs
= get_diffpairs(opt
, common
, merge
);
2878 if ((opt
->detect_directory_renames
== 2) ||
2879 (opt
->detect_directory_renames
== 1 && !opt
->call_depth
)) {
2880 dir_re_head
= get_directory_renames(head_pairs
);
2881 dir_re_merge
= get_directory_renames(merge_pairs
);
2883 handle_directory_level_conflicts(opt
,
2885 dir_re_merge
, merge
);
2887 dir_re_head
= xmalloc(sizeof(*dir_re_head
));
2888 dir_re_merge
= xmalloc(sizeof(*dir_re_merge
));
2889 dir_rename_init(dir_re_head
);
2890 dir_rename_init(dir_re_merge
);
2893 ri
->head_renames
= get_renames(opt
, opt
->branch1
, head_pairs
,
2894 dir_re_merge
, dir_re_head
, head
,
2895 common
, head
, merge
, entries
,
2899 ri
->merge_renames
= get_renames(opt
, opt
->branch2
, merge_pairs
,
2900 dir_re_head
, dir_re_merge
, merge
,
2901 common
, head
, merge
, entries
,
2905 clean
&= process_renames(opt
, ri
->head_renames
, ri
->merge_renames
);
2909 * Some cleanup is deferred until cleanup_renames() because the
2910 * data structures are still needed and referenced in
2911 * process_entry(). But there are a few things we can free now.
2913 initial_cleanup_rename(head_pairs
, dir_re_head
);
2914 initial_cleanup_rename(merge_pairs
, dir_re_merge
);
2919 static void final_cleanup_rename(struct string_list
*rename
)
2921 const struct rename
*re
;
2927 for (i
= 0; i
< rename
->nr
; i
++) {
2928 re
= rename
->items
[i
].util
;
2929 diff_free_filepair(re
->pair
);
2931 string_list_clear(rename
, 1);
2935 static void final_cleanup_renames(struct rename_info
*re_info
)
2937 final_cleanup_rename(re_info
->head_renames
);
2938 final_cleanup_rename(re_info
->merge_renames
);
2941 static int read_oid_strbuf(struct merge_options
*opt
,
2942 const struct object_id
*oid
,
2946 enum object_type type
;
2948 buf
= read_object_file(oid
, &type
, &size
);
2950 return err(opt
, _("cannot read object %s"), oid_to_hex(oid
));
2951 if (type
!= OBJ_BLOB
) {
2953 return err(opt
, _("object %s is not a blob"), oid_to_hex(oid
));
2955 strbuf_attach(dst
, buf
, size
, size
+ 1);
2959 static int blob_unchanged(struct merge_options
*opt
,
2960 const struct diff_filespec
*o
,
2961 const struct diff_filespec
*a
,
2962 int renormalize
, const char *path
)
2964 struct strbuf obuf
= STRBUF_INIT
;
2965 struct strbuf abuf
= STRBUF_INIT
;
2966 int ret
= 0; /* assume changed for safety */
2967 const struct index_state
*idx
= opt
->repo
->index
;
2969 if (a
->mode
!= o
->mode
)
2971 if (oid_eq(&o
->oid
, &a
->oid
))
2976 if (read_oid_strbuf(opt
, &o
->oid
, &obuf
) ||
2977 read_oid_strbuf(opt
, &a
->oid
, &abuf
))
2980 * Note: binary | is used so that both renormalizations are
2981 * performed. Comparison can be skipped if both files are
2982 * unchanged since their sha1s have already been compared.
2984 if (renormalize_buffer(idx
, path
, obuf
.buf
, obuf
.len
, &obuf
) |
2985 renormalize_buffer(idx
, path
, abuf
.buf
, abuf
.len
, &abuf
))
2986 ret
= (obuf
.len
== abuf
.len
&& !memcmp(obuf
.buf
, abuf
.buf
, obuf
.len
));
2989 strbuf_release(&obuf
);
2990 strbuf_release(&abuf
);
2994 static int handle_modify_delete(struct merge_options
*opt
,
2996 const struct diff_filespec
*o
,
2997 const struct diff_filespec
*a
,
2998 const struct diff_filespec
*b
)
3000 const char *modify_branch
, *delete_branch
;
3001 const struct diff_filespec
*changed
;
3004 modify_branch
= opt
->branch1
;
3005 delete_branch
= opt
->branch2
;
3008 modify_branch
= opt
->branch2
;
3009 delete_branch
= opt
->branch1
;
3013 return handle_change_delete(opt
,
3016 modify_branch
, delete_branch
,
3017 _("modify"), _("modified"));
3020 static int handle_content_merge(struct merge_file_info
*mfi
,
3021 struct merge_options
*opt
,
3024 const struct diff_filespec
*o
,
3025 const struct diff_filespec
*a
,
3026 const struct diff_filespec
*b
,
3027 struct rename_conflict_info
*ci
)
3029 const char *reason
= _("content");
3030 unsigned df_conflict_remains
= 0;
3033 reason
= _("add/add");
3035 assert(o
->path
&& a
->path
&& b
->path
);
3036 if (ci
&& dir_in_way(opt
->repo
->index
, path
, !opt
->call_depth
,
3037 S_ISGITLINK(ci
->ren1
->pair
->two
->mode
)))
3038 df_conflict_remains
= 1;
3040 if (merge_mode_and_contents(opt
, o
, a
, b
, path
,
3041 opt
->branch1
, opt
->branch2
,
3042 opt
->call_depth
* 2, mfi
))
3046 * We can skip updating the working tree file iff:
3047 * a) The merge is clean
3048 * b) The merge matches what was in HEAD (content, mode, pathname)
3049 * c) The target path is usable (i.e. not involved in D/F conflict)
3051 if (mfi
->clean
&& was_tracked_and_matches(opt
, path
, &mfi
->blob
) &&
3052 !df_conflict_remains
) {
3054 struct cache_entry
*ce
;
3056 output(opt
, 3, _("Skipped %s (merged same as existing)"), path
);
3057 if (add_cacheinfo(opt
, &mfi
->blob
, path
,
3058 0, (!opt
->call_depth
&& !is_dirty
), 0))
3061 * However, add_cacheinfo() will delete the old cache entry
3062 * and add a new one. We need to copy over any skip_worktree
3063 * flag to avoid making the file appear as if it were
3064 * deleted by the user.
3066 pos
= index_name_pos(&opt
->orig_index
, path
, strlen(path
));
3067 ce
= opt
->orig_index
.cache
[pos
];
3068 if (ce_skip_worktree(ce
)) {
3069 pos
= index_name_pos(opt
->repo
->index
, path
, strlen(path
));
3070 ce
= opt
->repo
->index
->cache
[pos
];
3071 ce
->ce_flags
|= CE_SKIP_WORKTREE
;
3077 if (S_ISGITLINK(mfi
->blob
.mode
))
3078 reason
= _("submodule");
3079 output(opt
, 1, _("CONFLICT (%s): Merge conflict in %s"),
3081 if (ci
&& !df_conflict_remains
)
3082 if (update_stages(opt
, path
, o
, a
, b
))
3086 if (df_conflict_remains
|| is_dirty
) {
3088 if (opt
->call_depth
) {
3089 remove_file_from_index(opt
->repo
->index
, path
);
3092 if (update_stages(opt
, path
, o
, a
, b
))
3095 int file_from_stage2
= was_tracked(opt
, path
);
3097 if (update_stages(opt
, path
, NULL
,
3098 file_from_stage2
? &mfi
->blob
: NULL
,
3099 file_from_stage2
? NULL
: &mfi
->blob
))
3104 new_path
= unique_path(opt
, path
, ci
->ren1
->branch
);
3106 output(opt
, 1, _("Refusing to lose dirty file at %s"),
3109 output(opt
, 1, _("Adding as %s instead"), new_path
);
3110 if (update_file(opt
, 0, &mfi
->blob
, new_path
)) {
3116 } else if (update_file(opt
, mfi
->clean
, &mfi
->blob
, path
))
3118 return !is_dirty
&& mfi
->clean
;
3121 static int handle_rename_normal(struct merge_options
*opt
,
3123 const struct diff_filespec
*o
,
3124 const struct diff_filespec
*a
,
3125 const struct diff_filespec
*b
,
3126 struct rename_conflict_info
*ci
)
3128 struct rename
*ren
= ci
->ren1
;
3129 struct merge_file_info mfi
;
3131 int side
= (ren
->branch
== opt
->branch1
? 2 : 3);
3133 /* Merge the content and write it out */
3134 clean
= handle_content_merge(&mfi
, opt
, path
, was_dirty(opt
, path
),
3137 if (clean
&& opt
->detect_directory_renames
== 1 &&
3138 ren
->dir_rename_original_dest
) {
3139 if (update_stages(opt
, path
,
3141 side
== 2 ? &mfi
.blob
: NULL
,
3142 side
== 2 ? NULL
: &mfi
.blob
))
3144 clean
= 0; /* not clean, but conflicted */
3149 static void dir_rename_warning(const char *msg
,
3152 struct merge_options
*opt
,
3155 const char *other_branch
;
3156 other_branch
= (ren
->branch
== opt
->branch1
?
3157 opt
->branch2
: opt
->branch1
);
3159 output(opt
, clean
? 2 : 1, msg
,
3160 ren
->pair
->one
->path
, ren
->branch
,
3161 other_branch
, ren
->pair
->two
->path
);
3164 output(opt
, clean
? 2 : 1, msg
,
3165 ren
->pair
->one
->path
, ren
->dir_rename_original_dest
, ren
->branch
,
3166 other_branch
, ren
->pair
->two
->path
);
3168 static int warn_about_dir_renamed_entries(struct merge_options
*opt
,
3172 int clean
= 1, is_add
;
3177 /* Return early if ren was not affected/created by a directory rename */
3178 if (!ren
->dir_rename_original_dest
)
3182 assert(opt
->detect_directory_renames
> 0);
3183 assert(ren
->dir_rename_original_type
== 'A' ||
3184 ren
->dir_rename_original_type
== 'R');
3186 /* Check whether to treat directory renames as a conflict */
3187 clean
= (opt
->detect_directory_renames
== 2);
3189 is_add
= (ren
->dir_rename_original_type
== 'A');
3190 if (ren
->dir_rename_original_type
== 'A' && clean
) {
3191 msg
= _("Path updated: %s added in %s inside a "
3192 "directory that was renamed in %s; moving it to %s.");
3193 } else if (ren
->dir_rename_original_type
== 'A' && !clean
) {
3194 msg
= _("CONFLICT (file location): %s added in %s "
3195 "inside a directory that was renamed in %s, "
3196 "suggesting it should perhaps be moved to %s.");
3197 } else if (ren
->dir_rename_original_type
== 'R' && clean
) {
3198 msg
= _("Path updated: %s renamed to %s in %s, inside a "
3199 "directory that was renamed in %s; moving it to %s.");
3200 } else if (ren
->dir_rename_original_type
== 'R' && !clean
) {
3201 msg
= _("CONFLICT (file location): %s renamed to %s in %s, "
3202 "inside a directory that was renamed in %s, "
3203 "suggesting it should perhaps be moved to %s.");
3205 BUG("Impossible dir_rename_original_type/clean combination");
3207 dir_rename_warning(msg
, is_add
, clean
, opt
, ren
);
3212 /* Per entry merge function */
3213 static int process_entry(struct merge_options
*opt
,
3214 const char *path
, struct stage_data
*entry
)
3216 int clean_merge
= 1;
3217 int normalize
= opt
->renormalize
;
3219 struct diff_filespec
*o
= &entry
->stages
[1];
3220 struct diff_filespec
*a
= &entry
->stages
[2];
3221 struct diff_filespec
*b
= &entry
->stages
[3];
3222 int o_valid
= is_valid(o
);
3223 int a_valid
= is_valid(a
);
3224 int b_valid
= is_valid(b
);
3225 o
->path
= a
->path
= b
->path
= (char*)path
;
3227 entry
->processed
= 1;
3228 if (entry
->rename_conflict_info
) {
3229 struct rename_conflict_info
*ci
= entry
->rename_conflict_info
;
3230 struct diff_filespec
*temp
;
3233 path_clean
= warn_about_dir_renamed_entries(opt
, ci
->ren1
);
3234 path_clean
&= warn_about_dir_renamed_entries(opt
, ci
->ren2
);
3237 * For cases with a single rename, {o,a,b}->path have all been
3238 * set to the rename target path; we need to set two of these
3239 * back to the rename source.
3240 * For rename/rename conflicts, we'll manually fix paths below.
3242 temp
= (opt
->branch1
== ci
->ren1
->branch
) ? b
: a
;
3243 o
->path
= temp
->path
= ci
->ren1
->pair
->one
->path
;
3245 assert(opt
->branch1
== ci
->ren1
->branch
);
3248 switch (ci
->rename_type
) {
3250 case RENAME_ONE_FILE_TO_ONE
:
3251 clean_merge
= handle_rename_normal(opt
, path
, o
, a
, b
,
3254 case RENAME_VIA_DIR
:
3255 clean_merge
= handle_rename_via_dir(opt
, ci
);
3259 * Probably unclean merge, but if the renamed file
3260 * merges cleanly and the result can then be
3261 * two-way merged cleanly with the added file, I
3262 * guess it's a clean merge?
3264 clean_merge
= handle_rename_add(opt
, ci
);
3268 if (handle_rename_delete(opt
, ci
))
3271 case RENAME_ONE_FILE_TO_TWO
:
3273 * Manually fix up paths; note:
3274 * ren[12]->pair->one->path are equal.
3276 o
->path
= ci
->ren1
->pair
->one
->path
;
3277 a
->path
= ci
->ren1
->pair
->two
->path
;
3278 b
->path
= ci
->ren2
->pair
->two
->path
;
3281 if (handle_rename_rename_1to2(opt
, ci
))
3284 case RENAME_TWO_FILES_TO_ONE
:
3286 * Manually fix up paths; note,
3287 * ren[12]->pair->two->path are actually equal.
3290 a
->path
= ci
->ren1
->pair
->two
->path
;
3291 b
->path
= ci
->ren2
->pair
->two
->path
;
3294 * Probably unclean merge, but if the two renamed
3295 * files merge cleanly and the two resulting files
3296 * can then be two-way merged cleanly, I guess it's
3299 clean_merge
= handle_rename_rename_2to1(opt
, ci
);
3302 entry
->processed
= 0;
3305 if (path_clean
< clean_merge
)
3306 clean_merge
= path_clean
;
3307 } else if (o_valid
&& (!a_valid
|| !b_valid
)) {
3308 /* Case A: Deleted in one */
3309 if ((!a_valid
&& !b_valid
) ||
3310 (!b_valid
&& blob_unchanged(opt
, o
, a
, normalize
, path
)) ||
3311 (!a_valid
&& blob_unchanged(opt
, o
, b
, normalize
, path
))) {
3312 /* Deleted in both or deleted in one and
3313 * unchanged in the other */
3315 output(opt
, 2, _("Removing %s"), path
);
3316 /* do not touch working file if it did not exist */
3317 remove_file(opt
, 1, path
, !a_valid
);
3319 /* Modify/delete; deleted side may have put a directory in the way */
3321 if (handle_modify_delete(opt
, path
, o
, a
, b
))
3324 } else if ((!o_valid
&& a_valid
&& !b_valid
) ||
3325 (!o_valid
&& !a_valid
&& b_valid
)) {
3326 /* Case B: Added in one. */
3327 /* [nothing|directory] -> ([nothing|directory], file) */
3329 const char *add_branch
;
3330 const char *other_branch
;
3332 const struct diff_filespec
*contents
;
3335 add_branch
= opt
->branch1
;
3336 other_branch
= opt
->branch2
;
3338 conf
= _("file/directory");
3340 add_branch
= opt
->branch2
;
3341 other_branch
= opt
->branch1
;
3343 conf
= _("directory/file");
3345 if (dir_in_way(opt
->repo
->index
, path
,
3346 !opt
->call_depth
&& !S_ISGITLINK(a
->mode
),
3348 char *new_path
= unique_path(opt
, path
, add_branch
);
3350 output(opt
, 1, _("CONFLICT (%s): There is a directory with name %s in %s. "
3352 conf
, path
, other_branch
, path
, new_path
);
3353 if (update_file(opt
, 0, contents
, new_path
))
3355 else if (opt
->call_depth
)
3356 remove_file_from_index(opt
->repo
->index
, path
);
3359 output(opt
, 2, _("Adding %s"), path
);
3360 /* do not overwrite file if already present */
3361 if (update_file_flags(opt
, contents
, path
, 1, !a_valid
))
3364 } else if (a_valid
&& b_valid
) {
3366 /* Case C: Added in both (check for same permissions) */
3368 _("CONFLICT (add/add): Merge conflict in %s"),
3370 clean_merge
= handle_file_collision(opt
,
3376 /* case D: Modified in both, but differently. */
3377 struct merge_file_info mfi
;
3378 int is_dirty
= 0; /* unpack_trees would have bailed if dirty */
3379 clean_merge
= handle_content_merge(&mfi
, opt
, path
,
3383 } else if (!o_valid
&& !a_valid
&& !b_valid
) {
3385 * this entry was deleted altogether. a_mode == 0 means
3386 * we had that path and want to actively remove it.
3388 remove_file(opt
, 1, path
, !a
->mode
);
3390 BUG("fatal merge failure, shouldn't happen.");
3395 int merge_trees(struct merge_options
*opt
,
3398 struct tree
*common
,
3399 struct tree
**result
)
3401 struct index_state
*istate
= opt
->repo
->index
;
3403 struct strbuf sb
= STRBUF_INIT
;
3405 if (!opt
->call_depth
&& repo_index_has_changes(opt
->repo
, head
, &sb
)) {
3406 err(opt
, _("Your local changes to the following files would be overwritten by merge:\n %s"),
3411 if (opt
->subtree_shift
) {
3412 merge
= shift_tree_object(opt
->repo
, head
, merge
, opt
->subtree_shift
);
3413 common
= shift_tree_object(opt
->repo
, head
, common
, opt
->subtree_shift
);
3416 if (oid_eq(&common
->object
.oid
, &merge
->object
.oid
)) {
3417 output(opt
, 0, _("Already up to date!"));
3422 code
= unpack_trees_start(opt
, common
, head
, merge
);
3425 if (show(opt
, 4) || opt
->call_depth
)
3426 err(opt
, _("merging of trees %s and %s failed"),
3427 oid_to_hex(&head
->object
.oid
),
3428 oid_to_hex(&merge
->object
.oid
));
3429 unpack_trees_finish(opt
);
3433 if (unmerged_index(istate
)) {
3434 struct string_list
*entries
;
3435 struct rename_info re_info
;
3438 * Only need the hashmap while processing entries, so
3439 * initialize it here and free it when we are done running
3440 * through the entries. Keeping it in the merge_options as
3441 * opposed to decaring a local hashmap is for convenience
3442 * so that we don't have to pass it to around.
3444 hashmap_init(&opt
->current_file_dir_set
, path_hashmap_cmp
, NULL
, 512);
3445 get_files_dirs(opt
, head
);
3446 get_files_dirs(opt
, merge
);
3448 entries
= get_unmerged(opt
->repo
->index
);
3449 clean
= detect_and_process_renames(opt
, common
, head
, merge
,
3451 record_df_conflict_files(opt
, entries
);
3454 for (i
= entries
->nr
-1; 0 <= i
; i
--) {
3455 const char *path
= entries
->items
[i
].string
;
3456 struct stage_data
*e
= entries
->items
[i
].util
;
3457 if (!e
->processed
) {
3458 int ret
= process_entry(opt
, path
, e
);
3467 for (i
= 0; i
< entries
->nr
; i
++) {
3468 struct stage_data
*e
= entries
->items
[i
].util
;
3470 BUG("unprocessed path??? %s",
3471 entries
->items
[i
].string
);
3475 final_cleanup_renames(&re_info
);
3477 string_list_clear(entries
, 1);
3480 hashmap_free(&opt
->current_file_dir_set
, 1);
3483 unpack_trees_finish(opt
);
3490 unpack_trees_finish(opt
);
3492 if (opt
->call_depth
&& !(*result
= write_tree_from_memory(opt
)))
3498 static struct commit_list
*reverse_commit_list(struct commit_list
*list
)
3500 struct commit_list
*next
= NULL
, *current
, *backup
;
3501 for (current
= list
; current
; current
= backup
) {
3502 backup
= current
->next
;
3503 current
->next
= next
;
3510 * Merge the commits h1 and h2, return the resulting virtual
3511 * commit object and a flag indicating the cleanness of the merge.
3513 int merge_recursive(struct merge_options
*opt
,
3516 struct commit_list
*ca
,
3517 struct commit
**result
)
3519 struct commit_list
*iter
;
3520 struct commit
*merged_common_ancestors
;
3521 struct tree
*mrtree
;
3525 output(opt
, 4, _("Merging:"));
3526 output_commit_title(opt
, h1
);
3527 output_commit_title(opt
, h2
);
3531 ca
= get_merge_bases(h1
, h2
);
3532 ca
= reverse_commit_list(ca
);
3536 unsigned cnt
= commit_list_count(ca
);
3538 output(opt
, 5, Q_("found %u common ancestor:",
3539 "found %u common ancestors:", cnt
), cnt
);
3540 for (iter
= ca
; iter
; iter
= iter
->next
)
3541 output_commit_title(opt
, iter
->item
);
3544 merged_common_ancestors
= pop_commit(&ca
);
3545 if (merged_common_ancestors
== NULL
) {
3546 /* if there is no common ancestor, use an empty tree */
3549 tree
= lookup_tree(opt
->repo
, opt
->repo
->hash_algo
->empty_tree
);
3550 merged_common_ancestors
= make_virtual_commit(opt
->repo
, tree
, "ancestor");
3553 for (iter
= ca
; iter
; iter
= iter
->next
) {
3554 const char *saved_b1
, *saved_b2
;
3557 * When the merge fails, the result contains files
3558 * with conflict markers. The cleanness flag is
3559 * ignored (unless indicating an error), it was never
3560 * actually used, as result of merge_trees has always
3561 * overwritten it: the committed "conflicts" were
3564 discard_index(opt
->repo
->index
);
3565 saved_b1
= opt
->branch1
;
3566 saved_b2
= opt
->branch2
;
3567 opt
->branch1
= "Temporary merge branch 1";
3568 opt
->branch2
= "Temporary merge branch 2";
3569 if (merge_recursive(opt
, merged_common_ancestors
, iter
->item
,
3570 NULL
, &merged_common_ancestors
) < 0)
3572 opt
->branch1
= saved_b1
;
3573 opt
->branch2
= saved_b2
;
3576 if (!merged_common_ancestors
)
3577 return err(opt
, _("merge returned no commit"));
3580 discard_index(opt
->repo
->index
);
3581 if (!opt
->call_depth
)
3582 repo_read_index(opt
->repo
);
3584 opt
->ancestor
= "merged common ancestors";
3585 clean
= merge_trees(opt
, get_commit_tree(h1
), get_commit_tree(h2
),
3586 get_commit_tree(merged_common_ancestors
),
3593 if (opt
->call_depth
) {
3594 *result
= make_virtual_commit(opt
->repo
, mrtree
, "merged tree");
3595 commit_list_insert(h1
, &(*result
)->parents
);
3596 commit_list_insert(h2
, &(*result
)->parents
->next
);
3599 if (!opt
->call_depth
&& opt
->buffer_output
< 2)
3600 strbuf_release(&opt
->obuf
);
3602 diff_warn_rename_limit("merge.renamelimit",
3603 opt
->needed_rename_limit
, 0);
3607 static struct commit
*get_ref(struct repository
*repo
, const struct object_id
*oid
,
3610 struct object
*object
;
3612 object
= deref_tag(repo
, parse_object(repo
, oid
),
3613 name
, strlen(name
));
3616 if (object
->type
== OBJ_TREE
)
3617 return make_virtual_commit(repo
, (struct tree
*)object
, name
);
3618 if (object
->type
!= OBJ_COMMIT
)
3620 if (parse_commit((struct commit
*)object
))
3622 return (struct commit
*)object
;
3625 int merge_recursive_generic(struct merge_options
*opt
,
3626 const struct object_id
*head
,
3627 const struct object_id
*merge
,
3629 const struct object_id
**base_list
,
3630 struct commit
**result
)
3633 struct lock_file lock
= LOCK_INIT
;
3634 struct commit
*head_commit
= get_ref(opt
->repo
, head
, opt
->branch1
);
3635 struct commit
*next_commit
= get_ref(opt
->repo
, merge
, opt
->branch2
);
3636 struct commit_list
*ca
= NULL
;
3640 for (i
= 0; i
< num_base_list
; ++i
) {
3641 struct commit
*base
;
3642 if (!(base
= get_ref(opt
->repo
, base_list
[i
], oid_to_hex(base_list
[i
]))))
3643 return err(opt
, _("Could not parse object '%s'"),
3644 oid_to_hex(base_list
[i
]));
3645 commit_list_insert(base
, &ca
);
3649 repo_hold_locked_index(opt
->repo
, &lock
, LOCK_DIE_ON_ERROR
);
3650 clean
= merge_recursive(opt
, head_commit
, next_commit
, ca
,
3653 rollback_lock_file(&lock
);
3657 if (write_locked_index(opt
->repo
->index
, &lock
,
3658 COMMIT_LOCK
| SKIP_IF_UNCHANGED
))
3659 return err(opt
, _("Unable to write index."));
3661 return clean
? 0 : 1;
3664 static void merge_recursive_config(struct merge_options
*opt
)
3667 git_config_get_int("merge.verbosity", &opt
->verbosity
);
3668 git_config_get_int("diff.renamelimit", &opt
->diff_rename_limit
);
3669 git_config_get_int("merge.renamelimit", &opt
->merge_rename_limit
);
3670 if (!git_config_get_string("diff.renames", &value
)) {
3671 opt
->diff_detect_rename
= git_config_rename("diff.renames", value
);
3674 if (!git_config_get_string("merge.renames", &value
)) {
3675 opt
->merge_detect_rename
= git_config_rename("merge.renames", value
);
3678 if (!git_config_get_string("merge.directoryrenames", &value
)) {
3679 int boolval
= git_parse_maybe_bool(value
);
3681 opt
->detect_directory_renames
= boolval
? 2 : 0;
3682 } else if (!strcasecmp(value
, "conflict")) {
3683 opt
->detect_directory_renames
= 1;
3684 } /* avoid erroring on values from future versions of git */
3687 git_config(git_xmerge_config
, NULL
);
3690 void init_merge_options(struct merge_options
*opt
,
3691 struct repository
*repo
)
3693 const char *merge_verbosity
;
3694 memset(opt
, 0, sizeof(struct merge_options
));
3697 opt
->buffer_output
= 1;
3698 opt
->diff_rename_limit
= -1;
3699 opt
->merge_rename_limit
= -1;
3700 opt
->renormalize
= 0;
3701 opt
->diff_detect_rename
= -1;
3702 opt
->merge_detect_rename
= -1;
3703 opt
->detect_directory_renames
= 1;
3704 merge_recursive_config(opt
);
3705 merge_verbosity
= getenv("GIT_MERGE_VERBOSITY");
3706 if (merge_verbosity
)
3707 opt
->verbosity
= strtol(merge_verbosity
, NULL
, 10);
3708 if (opt
->verbosity
>= 5)
3709 opt
->buffer_output
= 0;
3710 strbuf_init(&opt
->obuf
, 0);
3711 string_list_init(&opt
->df_conflict_file_set
, 1);
3714 int parse_merge_opt(struct merge_options
*opt
, const char *s
)
3720 if (!strcmp(s
, "ours"))
3721 opt
->recursive_variant
= MERGE_RECURSIVE_OURS
;
3722 else if (!strcmp(s
, "theirs"))
3723 opt
->recursive_variant
= MERGE_RECURSIVE_THEIRS
;
3724 else if (!strcmp(s
, "subtree"))
3725 opt
->subtree_shift
= "";
3726 else if (skip_prefix(s
, "subtree=", &arg
))
3727 opt
->subtree_shift
= arg
;
3728 else if (!strcmp(s
, "patience"))
3729 opt
->xdl_opts
= DIFF_WITH_ALG(opt
, PATIENCE_DIFF
);
3730 else if (!strcmp(s
, "histogram"))
3731 opt
->xdl_opts
= DIFF_WITH_ALG(opt
, HISTOGRAM_DIFF
);
3732 else if (skip_prefix(s
, "diff-algorithm=", &arg
)) {
3733 long value
= parse_algorithm_value(arg
);
3736 /* clear out previous settings */
3737 DIFF_XDL_CLR(opt
, NEED_MINIMAL
);
3738 opt
->xdl_opts
&= ~XDF_DIFF_ALGORITHM_MASK
;
3739 opt
->xdl_opts
|= value
;
3741 else if (!strcmp(s
, "ignore-space-change"))
3742 DIFF_XDL_SET(opt
, IGNORE_WHITESPACE_CHANGE
);
3743 else if (!strcmp(s
, "ignore-all-space"))
3744 DIFF_XDL_SET(opt
, IGNORE_WHITESPACE
);
3745 else if (!strcmp(s
, "ignore-space-at-eol"))
3746 DIFF_XDL_SET(opt
, IGNORE_WHITESPACE_AT_EOL
);
3747 else if (!strcmp(s
, "ignore-cr-at-eol"))
3748 DIFF_XDL_SET(opt
, IGNORE_CR_AT_EOL
);
3749 else if (!strcmp(s
, "renormalize"))
3750 opt
->renormalize
= 1;
3751 else if (!strcmp(s
, "no-renormalize"))
3752 opt
->renormalize
= 0;
3753 else if (!strcmp(s
, "no-renames"))
3754 opt
->merge_detect_rename
= 0;
3755 else if (!strcmp(s
, "find-renames")) {
3756 opt
->merge_detect_rename
= 1;
3757 opt
->rename_score
= 0;
3759 else if (skip_prefix(s
, "find-renames=", &arg
) ||
3760 skip_prefix(s
, "rename-threshold=", &arg
)) {
3761 if ((opt
->rename_score
= parse_rename_score(&arg
)) == -1 || *arg
!= 0)
3763 opt
->merge_detect_rename
= 1;
3766 * Please update $__git_merge_strategy_options in
3767 * git-completion.bash when you add new options