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
,
39 const void *entry_or_key
,
42 const struct path_hashmap_entry
*a
= entry
;
43 const struct path_hashmap_entry
*b
= entry_or_key
;
44 const char *key
= keydata
;
47 return strcasecmp(a
->path
, key
? key
: b
->path
);
49 return strcmp(a
->path
, key
? key
: b
->path
);
52 static unsigned int path_hash(const char *path
)
54 return ignore_case
? strihash(path
) : strhash(path
);
57 static struct dir_rename_entry
*dir_rename_find_entry(struct hashmap
*hashmap
,
60 struct dir_rename_entry key
;
64 hashmap_entry_init(&key
, strhash(dir
));
66 return hashmap_get(hashmap
, &key
, NULL
);
69 static int dir_rename_cmp(const void *unused_cmp_data
,
71 const void *entry_or_key
,
72 const void *unused_keydata
)
74 const struct dir_rename_entry
*e1
= entry
;
75 const struct dir_rename_entry
*e2
= entry_or_key
;
77 return strcmp(e1
->dir
, e2
->dir
);
80 static void dir_rename_init(struct hashmap
*map
)
82 hashmap_init(map
, dir_rename_cmp
, NULL
, 0);
85 static void dir_rename_entry_init(struct dir_rename_entry
*entry
,
88 hashmap_entry_init(entry
, strhash(directory
));
89 entry
->dir
= directory
;
90 entry
->non_unique_new_dir
= 0;
91 strbuf_init(&entry
->new_dir
, 0);
92 string_list_init(&entry
->possible_new_dirs
, 0);
95 static struct collision_entry
*collision_find_entry(struct hashmap
*hashmap
,
98 struct collision_entry key
;
100 hashmap_entry_init(&key
, strhash(target_file
));
101 key
.target_file
= target_file
;
102 return hashmap_get(hashmap
, &key
, NULL
);
105 static int collision_cmp(void *unused_cmp_data
,
106 const struct collision_entry
*e1
,
107 const struct collision_entry
*e2
,
108 const void *unused_keydata
)
110 return strcmp(e1
->target_file
, e2
->target_file
);
113 static void collision_init(struct hashmap
*map
)
115 hashmap_init(map
, (hashmap_cmp_fn
) collision_cmp
, NULL
, 0);
118 static void flush_output(struct merge_options
*opt
)
120 if (opt
->buffer_output
< 2 && opt
->obuf
.len
) {
121 fputs(opt
->obuf
.buf
, stdout
);
122 strbuf_reset(&opt
->obuf
);
126 static int err(struct merge_options
*opt
, const char *err
, ...)
130 if (opt
->buffer_output
< 2)
133 strbuf_complete(&opt
->obuf
, '\n');
134 strbuf_addstr(&opt
->obuf
, "error: ");
136 va_start(params
, err
);
137 strbuf_vaddf(&opt
->obuf
, err
, params
);
139 if (opt
->buffer_output
> 1)
140 strbuf_addch(&opt
->obuf
, '\n');
142 error("%s", opt
->obuf
.buf
);
143 strbuf_reset(&opt
->obuf
);
149 static struct tree
*shift_tree_object(struct repository
*repo
,
150 struct tree
*one
, struct tree
*two
,
151 const char *subtree_shift
)
153 struct object_id shifted
;
155 if (!*subtree_shift
) {
156 shift_tree(repo
, &one
->object
.oid
, &two
->object
.oid
, &shifted
, 0);
158 shift_tree_by(repo
, &one
->object
.oid
, &two
->object
.oid
, &shifted
,
161 if (oideq(&two
->object
.oid
, &shifted
))
163 return lookup_tree(repo
, &shifted
);
166 static inline void set_commit_tree(struct commit
*c
, struct tree
*t
)
171 static struct commit
*make_virtual_commit(struct repository
*repo
,
175 struct commit
*commit
= alloc_commit_node(repo
);
177 set_merge_remote_desc(commit
, comment
, (struct object
*)commit
);
178 set_commit_tree(commit
, tree
);
179 commit
->object
.parsed
= 1;
184 * Since we use get_tree_entry(), which does not put the read object into
185 * the object pool, we cannot rely on a == b.
187 static int oid_eq(const struct object_id
*a
, const struct object_id
*b
)
191 return a
&& b
&& oideq(a
, b
);
199 RENAME_ONE_FILE_TO_ONE
,
200 RENAME_ONE_FILE_TO_TWO
,
201 RENAME_TWO_FILES_TO_ONE
205 * Since we want to write the index eventually, we cannot reuse the index
206 * for these (temporary) data.
209 struct diff_filespec stages
[4]; /* mostly for oid & mode; maybe path */
210 struct rename_conflict_info
*rename_conflict_info
;
211 unsigned processed
:1;
215 unsigned processed
:1;
216 struct diff_filepair
*pair
;
217 const char *branch
; /* branch that the rename occurred on */
219 * If directory rename detection affected this rename, what was its
220 * original type ('A' or 'R') and it's original destination before
221 * the directory rename (otherwise, '\0' and NULL for these two vars).
223 char dir_rename_original_type
;
224 char *dir_rename_original_dest
;
226 * Purpose of src_entry and dst_entry:
228 * If 'before' is renamed to 'after' then src_entry will contain
229 * the versions of 'before' from the merge_base, HEAD, and MERGE in
230 * stages 1, 2, and 3; dst_entry will contain the respective
231 * versions of 'after' in corresponding locations. Thus, we have a
232 * total of six modes and oids, though some will be null. (Stage 0
233 * is ignored; we're interested in handling conflicts.)
235 * Since we don't turn on break-rewrites by default, neither
236 * src_entry nor dst_entry can have all three of their stages have
237 * non-null oids, meaning at most four of the six will be non-null.
238 * Also, since this is a rename, both src_entry and dst_entry will
239 * have at least one non-null oid, meaning at least two will be
240 * non-null. Of the six oids, a typical rename will have three be
241 * non-null. Only two implies a rename/delete, and four implies a
244 struct stage_data
*src_entry
;
245 struct stage_data
*dst_entry
;
248 struct rename_conflict_info
{
249 enum rename_type rename_type
;
254 static inline void setup_rename_conflict_info(enum rename_type rename_type
,
255 struct merge_options
*opt
,
259 struct rename_conflict_info
*ci
;
262 * When we have two renames involved, it's easiest to get the
263 * correct things into stage 2 and 3, and to make sure that the
264 * content merge puts HEAD before the other branch if we just
265 * ensure that branch1 == opt->branch1. So, simply flip arguments
266 * around if we don't have that.
268 if (ren2
&& ren1
->branch
!= opt
->branch1
) {
269 setup_rename_conflict_info(rename_type
, opt
, ren2
, ren1
);
273 ci
= xcalloc(1, sizeof(struct rename_conflict_info
));
274 ci
->rename_type
= rename_type
;
278 ci
->ren1
->dst_entry
->processed
= 0;
279 ci
->ren1
->dst_entry
->rename_conflict_info
= ci
;
281 ci
->ren2
->dst_entry
->rename_conflict_info
= ci
;
285 static int show(struct merge_options
*opt
, int v
)
287 return (!opt
->call_depth
&& opt
->verbosity
>= v
) || opt
->verbosity
>= 5;
290 __attribute__((format (printf
, 3, 4)))
291 static void output(struct merge_options
*opt
, int v
, const char *fmt
, ...)
298 strbuf_addchars(&opt
->obuf
, ' ', opt
->call_depth
* 2);
301 strbuf_vaddf(&opt
->obuf
, fmt
, ap
);
304 strbuf_addch(&opt
->obuf
, '\n');
305 if (!opt
->buffer_output
)
309 static void output_commit_title(struct merge_options
*opt
, struct commit
*commit
)
311 struct merge_remote_desc
*desc
;
313 strbuf_addchars(&opt
->obuf
, ' ', opt
->call_depth
* 2);
314 desc
= merge_remote_util(commit
);
316 strbuf_addf(&opt
->obuf
, "virtual %s\n", desc
->name
);
318 strbuf_add_unique_abbrev(&opt
->obuf
, &commit
->object
.oid
,
320 strbuf_addch(&opt
->obuf
, ' ');
321 if (parse_commit(commit
) != 0)
322 strbuf_addstr(&opt
->obuf
, _("(bad commit)\n"));
325 const char *msg
= get_commit_buffer(commit
, NULL
);
326 int len
= find_commit_subject(msg
, &title
);
328 strbuf_addf(&opt
->obuf
, "%.*s\n", len
, title
);
329 unuse_commit_buffer(commit
, msg
);
335 static int add_cacheinfo(struct merge_options
*opt
,
336 const struct diff_filespec
*blob
,
337 const char *path
, int stage
, int refresh
, int options
)
339 struct index_state
*istate
= opt
->repo
->index
;
340 struct cache_entry
*ce
;
343 ce
= make_cache_entry(istate
, blob
->mode
, &blob
->oid
, path
, stage
, 0);
345 return err(opt
, _("add_cacheinfo failed for path '%s'; merge aborting."), path
);
347 ret
= add_index_entry(istate
, ce
, options
);
349 struct cache_entry
*nce
;
351 nce
= refresh_cache_entry(istate
, ce
,
352 CE_MATCH_REFRESH
| CE_MATCH_IGNORE_MISSING
);
354 return err(opt
, _("add_cacheinfo failed to refresh for path '%s'; merge aborting."), path
);
356 ret
= add_index_entry(istate
, nce
, options
);
361 static void init_tree_desc_from_tree(struct tree_desc
*desc
, struct tree
*tree
)
364 init_tree_desc(desc
, tree
->buffer
, tree
->size
);
367 static int unpack_trees_start(struct merge_options
*opt
,
373 struct tree_desc t
[3];
374 struct index_state tmp_index
= { NULL
};
376 memset(&opt
->unpack_opts
, 0, sizeof(opt
->unpack_opts
));
378 opt
->unpack_opts
.index_only
= 1;
380 opt
->unpack_opts
.update
= 1;
381 opt
->unpack_opts
.merge
= 1;
382 opt
->unpack_opts
.head_idx
= 2;
383 opt
->unpack_opts
.fn
= threeway_merge
;
384 opt
->unpack_opts
.src_index
= opt
->repo
->index
;
385 opt
->unpack_opts
.dst_index
= &tmp_index
;
386 opt
->unpack_opts
.aggressive
= !merge_detect_rename(opt
);
387 setup_unpack_trees_porcelain(&opt
->unpack_opts
, "merge");
389 init_tree_desc_from_tree(t
+0, common
);
390 init_tree_desc_from_tree(t
+1, head
);
391 init_tree_desc_from_tree(t
+2, merge
);
393 rc
= unpack_trees(3, t
, &opt
->unpack_opts
);
394 cache_tree_free(&opt
->repo
->index
->cache_tree
);
397 * Update opt->repo->index to match the new results, AFTER saving a copy
398 * in opt->orig_index. Update src_index to point to the saved copy.
399 * (verify_uptodate() checks src_index, and the original index is
400 * the one that had the necessary modification timestamps.)
402 opt
->orig_index
= *opt
->repo
->index
;
403 *opt
->repo
->index
= tmp_index
;
404 opt
->unpack_opts
.src_index
= &opt
->orig_index
;
409 static void unpack_trees_finish(struct merge_options
*opt
)
411 discard_index(&opt
->orig_index
);
412 clear_unpack_trees_porcelain(&opt
->unpack_opts
);
415 static int save_files_dirs(const struct object_id
*oid
,
416 struct strbuf
*base
, const char *path
,
417 unsigned int mode
, int stage
, void *context
)
419 struct path_hashmap_entry
*entry
;
420 int baselen
= base
->len
;
421 struct merge_options
*opt
= context
;
423 strbuf_addstr(base
, path
);
425 FLEX_ALLOC_MEM(entry
, path
, base
->buf
, base
->len
);
426 hashmap_entry_init(entry
, path_hash(entry
->path
));
427 hashmap_add(&opt
->current_file_dir_set
, entry
);
429 strbuf_setlen(base
, baselen
);
430 return (S_ISDIR(mode
) ? READ_TREE_RECURSIVE
: 0);
433 static void get_files_dirs(struct merge_options
*opt
, struct tree
*tree
)
435 struct pathspec match_all
;
436 memset(&match_all
, 0, sizeof(match_all
));
437 read_tree_recursive(opt
->repo
, tree
, "", 0, 0,
438 &match_all
, save_files_dirs
, opt
);
441 static int get_tree_entry_if_blob(struct repository
*r
,
442 const struct object_id
*tree
,
444 struct diff_filespec
*dfs
)
448 ret
= get_tree_entry(r
, tree
, path
, &dfs
->oid
, &dfs
->mode
);
449 if (S_ISDIR(dfs
->mode
)) {
450 oidcpy(&dfs
->oid
, &null_oid
);
457 * Returns an index_entry instance which doesn't have to correspond to
458 * a real cache entry in Git's index.
460 static struct stage_data
*insert_stage_data(struct repository
*r
,
462 struct tree
*o
, struct tree
*a
, struct tree
*b
,
463 struct string_list
*entries
)
465 struct string_list_item
*item
;
466 struct stage_data
*e
= xcalloc(1, sizeof(struct stage_data
));
467 get_tree_entry_if_blob(r
, &o
->object
.oid
, path
, &e
->stages
[1]);
468 get_tree_entry_if_blob(r
, &a
->object
.oid
, path
, &e
->stages
[2]);
469 get_tree_entry_if_blob(r
, &b
->object
.oid
, path
, &e
->stages
[3]);
470 item
= string_list_insert(entries
, path
);
476 * Create a dictionary mapping file names to stage_data objects. The
477 * dictionary contains one entry for every path with a non-zero stage entry.
479 static struct string_list
*get_unmerged(struct index_state
*istate
)
481 struct string_list
*unmerged
= xcalloc(1, sizeof(struct string_list
));
484 unmerged
->strdup_strings
= 1;
486 for (i
= 0; i
< istate
->cache_nr
; i
++) {
487 struct string_list_item
*item
;
488 struct stage_data
*e
;
489 const struct cache_entry
*ce
= istate
->cache
[i
];
493 item
= string_list_lookup(unmerged
, ce
->name
);
495 item
= string_list_insert(unmerged
, ce
->name
);
496 item
->util
= xcalloc(1, sizeof(struct stage_data
));
499 e
->stages
[ce_stage(ce
)].mode
= ce
->ce_mode
;
500 oidcpy(&e
->stages
[ce_stage(ce
)].oid
, &ce
->oid
);
506 static int string_list_df_name_compare(const char *one
, const char *two
)
508 int onelen
= strlen(one
);
509 int twolen
= strlen(two
);
511 * Here we only care that entries for D/F conflicts are
512 * adjacent, in particular with the file of the D/F conflict
513 * appearing before files below the corresponding directory.
514 * The order of the rest of the list is irrelevant for us.
516 * To achieve this, we sort with df_name_compare and provide
517 * the mode S_IFDIR so that D/F conflicts will sort correctly.
518 * We use the mode S_IFDIR for everything else for simplicity,
519 * since in other cases any changes in their order due to
520 * sorting cause no problems for us.
522 int cmp
= df_name_compare(one
, onelen
, S_IFDIR
,
523 two
, twolen
, S_IFDIR
);
525 * Now that 'foo' and 'foo/bar' compare equal, we have to make sure
526 * that 'foo' comes before 'foo/bar'.
530 return onelen
- twolen
;
533 static void record_df_conflict_files(struct merge_options
*opt
,
534 struct string_list
*entries
)
536 /* If there is a D/F conflict and the file for such a conflict
537 * currently exists in the working tree, we want to allow it to be
538 * removed to make room for the corresponding directory if needed.
539 * The files underneath the directories of such D/F conflicts will
540 * be processed before the corresponding file involved in the D/F
541 * conflict. If the D/F directory ends up being removed by the
542 * merge, then we won't have to touch the D/F file. If the D/F
543 * directory needs to be written to the working copy, then the D/F
544 * file will simply be removed (in make_room_for_path()) to make
545 * room for the necessary paths. Note that if both the directory
546 * and the file need to be present, then the D/F file will be
547 * reinstated with a new unique name at the time it is processed.
549 struct string_list df_sorted_entries
= STRING_LIST_INIT_NODUP
;
550 const char *last_file
= NULL
;
555 * If we're merging merge-bases, we don't want to bother with
556 * any working directory changes.
561 /* Ensure D/F conflicts are adjacent in the entries list. */
562 for (i
= 0; i
< entries
->nr
; i
++) {
563 struct string_list_item
*next
= &entries
->items
[i
];
564 string_list_append(&df_sorted_entries
, next
->string
)->util
=
567 df_sorted_entries
.cmp
= string_list_df_name_compare
;
568 string_list_sort(&df_sorted_entries
);
570 string_list_clear(&opt
->df_conflict_file_set
, 1);
571 for (i
= 0; i
< df_sorted_entries
.nr
; i
++) {
572 const char *path
= df_sorted_entries
.items
[i
].string
;
573 int len
= strlen(path
);
574 struct stage_data
*e
= df_sorted_entries
.items
[i
].util
;
577 * Check if last_file & path correspond to a D/F conflict;
578 * i.e. whether path is last_file+'/'+<something>.
579 * If so, record that it's okay to remove last_file to make
580 * room for path and friends if needed.
584 memcmp(path
, last_file
, last_len
) == 0 &&
585 path
[last_len
] == '/') {
586 string_list_insert(&opt
->df_conflict_file_set
, last_file
);
590 * Determine whether path could exist as a file in the
591 * working directory as a possible D/F conflict. This
592 * will only occur when it exists in stage 2 as a
595 if (S_ISREG(e
->stages
[2].mode
) || S_ISLNK(e
->stages
[2].mode
)) {
602 string_list_clear(&df_sorted_entries
, 0);
605 static int update_stages(struct merge_options
*opt
, const char *path
,
606 const struct diff_filespec
*o
,
607 const struct diff_filespec
*a
,
608 const struct diff_filespec
*b
)
612 * NOTE: It is usually a bad idea to call update_stages on a path
613 * before calling update_file on that same path, since it can
614 * sometimes lead to spurious "refusing to lose untracked file..."
615 * messages from update_file (via make_room_for path via
616 * would_lose_untracked). Instead, reverse the order of the calls
617 * (executing update_file first and then update_stages).
620 int options
= ADD_CACHE_OK_TO_ADD
| ADD_CACHE_SKIP_DFCHECK
;
622 if (remove_file_from_index(opt
->repo
->index
, path
))
625 if (add_cacheinfo(opt
, o
, path
, 1, 0, options
))
628 if (add_cacheinfo(opt
, a
, path
, 2, 0, options
))
631 if (add_cacheinfo(opt
, b
, path
, 3, 0, options
))
636 static void update_entry(struct stage_data
*entry
,
637 struct diff_filespec
*o
,
638 struct diff_filespec
*a
,
639 struct diff_filespec
*b
)
641 entry
->processed
= 0;
642 entry
->stages
[1].mode
= o
->mode
;
643 entry
->stages
[2].mode
= a
->mode
;
644 entry
->stages
[3].mode
= b
->mode
;
645 oidcpy(&entry
->stages
[1].oid
, &o
->oid
);
646 oidcpy(&entry
->stages
[2].oid
, &a
->oid
);
647 oidcpy(&entry
->stages
[3].oid
, &b
->oid
);
650 static int remove_file(struct merge_options
*opt
, int clean
,
651 const char *path
, int no_wd
)
653 int update_cache
= opt
->call_depth
|| clean
;
654 int update_working_directory
= !opt
->call_depth
&& !no_wd
;
657 if (remove_file_from_index(opt
->repo
->index
, path
))
660 if (update_working_directory
) {
662 struct cache_entry
*ce
;
663 ce
= index_file_exists(opt
->repo
->index
, path
, strlen(path
),
665 if (ce
&& ce_stage(ce
) == 0 && strcmp(path
, ce
->name
))
668 if (remove_path(path
))
674 /* add a string to a strbuf, but converting "/" to "_" */
675 static void add_flattened_path(struct strbuf
*out
, const char *s
)
678 strbuf_addstr(out
, s
);
679 for (; i
< out
->len
; i
++)
680 if (out
->buf
[i
] == '/')
684 static char *unique_path(struct merge_options
*opt
, const char *path
, const char *branch
)
686 struct path_hashmap_entry
*entry
;
687 struct strbuf newpath
= STRBUF_INIT
;
691 strbuf_addf(&newpath
, "%s~", path
);
692 add_flattened_path(&newpath
, branch
);
694 base_len
= newpath
.len
;
695 while (hashmap_get_from_hash(&opt
->current_file_dir_set
,
696 path_hash(newpath
.buf
), newpath
.buf
) ||
697 (!opt
->call_depth
&& file_exists(newpath
.buf
))) {
698 strbuf_setlen(&newpath
, base_len
);
699 strbuf_addf(&newpath
, "_%d", suffix
++);
702 FLEX_ALLOC_MEM(entry
, path
, newpath
.buf
, newpath
.len
);
703 hashmap_entry_init(entry
, path_hash(entry
->path
));
704 hashmap_add(&opt
->current_file_dir_set
, entry
);
705 return strbuf_detach(&newpath
, NULL
);
709 * Check whether a directory in the index is in the way of an incoming
710 * file. Return 1 if so. If check_working_copy is non-zero, also
711 * check the working directory. If empty_ok is non-zero, also return
712 * 0 in the case where the working-tree dir exists but is empty.
714 static int dir_in_way(struct index_state
*istate
, const char *path
,
715 int check_working_copy
, int empty_ok
)
718 struct strbuf dirpath
= STRBUF_INIT
;
721 strbuf_addstr(&dirpath
, path
);
722 strbuf_addch(&dirpath
, '/');
724 pos
= index_name_pos(istate
, dirpath
.buf
, dirpath
.len
);
728 if (pos
< istate
->cache_nr
&&
729 !strncmp(dirpath
.buf
, istate
->cache
[pos
]->name
, dirpath
.len
)) {
730 strbuf_release(&dirpath
);
734 strbuf_release(&dirpath
);
735 return check_working_copy
&& !lstat(path
, &st
) && S_ISDIR(st
.st_mode
) &&
736 !(empty_ok
&& is_empty_dir(path
));
740 * Returns whether path was tracked in the index before the merge started,
741 * and its oid and mode match the specified values
743 static int was_tracked_and_matches(struct merge_options
*opt
, const char *path
,
744 const struct diff_filespec
*blob
)
746 int pos
= index_name_pos(&opt
->orig_index
, path
, strlen(path
));
747 struct cache_entry
*ce
;
750 /* we were not tracking this path before the merge */
753 /* See if the file we were tracking before matches */
754 ce
= opt
->orig_index
.cache
[pos
];
755 return (oid_eq(&ce
->oid
, &blob
->oid
) && ce
->ce_mode
== blob
->mode
);
759 * Returns whether path was tracked in the index before the merge started
761 static int was_tracked(struct merge_options
*opt
, const char *path
)
763 int pos
= index_name_pos(&opt
->orig_index
, path
, strlen(path
));
766 /* we were tracking this path before the merge */
772 static int would_lose_untracked(struct merge_options
*opt
, const char *path
)
774 struct index_state
*istate
= opt
->repo
->index
;
777 * This may look like it can be simplified to:
778 * return !was_tracked(opt, path) && file_exists(path)
779 * but it can't. This function needs to know whether path was in
780 * the working tree due to EITHER having been tracked in the index
781 * before the merge OR having been put into the working copy and
782 * index by unpack_trees(). Due to that either-or requirement, we
783 * check the current index instead of the original one.
785 * Note that we do not need to worry about merge-recursive itself
786 * updating the index after unpack_trees() and before calling this
787 * function, because we strictly require all code paths in
788 * merge-recursive to update the working tree first and the index
789 * second. Doing otherwise would break
790 * update_file()/would_lose_untracked(); see every comment in this
791 * file which mentions "update_stages".
793 int pos
= index_name_pos(istate
, path
, strlen(path
));
797 while (pos
< istate
->cache_nr
&&
798 !strcmp(path
, istate
->cache
[pos
]->name
)) {
800 * If stage #0, it is definitely tracked.
801 * If it has stage #2 then it was tracked
802 * before this merge started. All other
803 * cases the path was not tracked.
805 switch (ce_stage(istate
->cache
[pos
])) {
812 return file_exists(path
);
815 static int was_dirty(struct merge_options
*opt
, const char *path
)
817 struct cache_entry
*ce
;
820 if (opt
->call_depth
|| !was_tracked(opt
, path
))
823 ce
= index_file_exists(opt
->unpack_opts
.src_index
,
824 path
, strlen(path
), ignore_case
);
825 dirty
= verify_uptodate(ce
, &opt
->unpack_opts
) != 0;
829 static int make_room_for_path(struct merge_options
*opt
, const char *path
)
832 const char *msg
= _("failed to create path '%s'%s");
834 /* Unlink any D/F conflict files that are in the way */
835 for (i
= 0; i
< opt
->df_conflict_file_set
.nr
; i
++) {
836 const char *df_path
= opt
->df_conflict_file_set
.items
[i
].string
;
837 size_t pathlen
= strlen(path
);
838 size_t df_pathlen
= strlen(df_path
);
839 if (df_pathlen
< pathlen
&&
840 path
[df_pathlen
] == '/' &&
841 strncmp(path
, df_path
, df_pathlen
) == 0) {
843 _("Removing %s to make room for subdirectory\n"),
846 unsorted_string_list_delete_item(&opt
->df_conflict_file_set
,
852 /* Make sure leading directories are created */
853 status
= safe_create_leading_directories_const(path
);
855 if (status
== SCLD_EXISTS
)
856 /* something else exists */
857 return err(opt
, msg
, path
, _(": perhaps a D/F conflict?"));
858 return err(opt
, msg
, path
, "");
862 * Do not unlink a file in the work tree if we are not
865 if (would_lose_untracked(opt
, path
))
866 return err(opt
, _("refusing to lose untracked file at '%s'"),
869 /* Successful unlink is good.. */
872 /* .. and so is no existing file */
875 /* .. but not some other error (who really cares what?) */
876 return err(opt
, msg
, path
, _(": perhaps a D/F conflict?"));
879 static int update_file_flags(struct merge_options
*opt
,
880 const struct diff_filespec
*contents
,
891 enum object_type type
;
895 if (S_ISGITLINK(contents
->mode
)) {
897 * We may later decide to recursively descend into
898 * the submodule directory and update its index
899 * and/or work tree, but we do not do that now.
905 buf
= read_object_file(&contents
->oid
, &type
, &size
);
907 ret
= err(opt
, _("cannot read object %s '%s'"),
908 oid_to_hex(&contents
->oid
), path
);
911 if (type
!= OBJ_BLOB
) {
912 ret
= err(opt
, _("blob expected for %s '%s'"),
913 oid_to_hex(&contents
->oid
), path
);
916 if (S_ISREG(contents
->mode
)) {
917 struct strbuf strbuf
= STRBUF_INIT
;
918 if (convert_to_working_tree(opt
->repo
->index
, path
, buf
, size
, &strbuf
)) {
921 buf
= strbuf_detach(&strbuf
, NULL
);
925 if (make_room_for_path(opt
, path
) < 0) {
929 if (S_ISREG(contents
->mode
) ||
930 (!has_symlinks
&& S_ISLNK(contents
->mode
))) {
932 int mode
= (contents
->mode
& 0100 ? 0777 : 0666);
934 fd
= open(path
, O_WRONLY
| O_TRUNC
| O_CREAT
, mode
);
936 ret
= err(opt
, _("failed to open '%s': %s"),
937 path
, strerror(errno
));
940 write_in_full(fd
, buf
, size
);
942 } else if (S_ISLNK(contents
->mode
)) {
943 char *lnk
= xmemdupz(buf
, size
);
944 safe_create_leading_directories_const(path
);
946 if (symlink(lnk
, path
))
947 ret
= err(opt
, _("failed to symlink '%s': %s"),
948 path
, strerror(errno
));
952 _("do not know what to do with %06o %s '%s'"),
953 contents
->mode
, oid_to_hex(&contents
->oid
), path
);
958 if (!ret
&& update_cache
)
959 if (add_cacheinfo(opt
, contents
, path
, 0, update_wd
,
960 ADD_CACHE_OK_TO_ADD
))
965 static int update_file(struct merge_options
*opt
,
967 const struct diff_filespec
*contents
,
970 return update_file_flags(opt
, contents
, path
,
971 opt
->call_depth
|| clean
, !opt
->call_depth
);
974 /* Low level file merging, update and removal */
976 struct merge_file_info
{
977 struct diff_filespec blob
; /* mostly use oid & mode; sometimes path */
982 static int merge_3way(struct merge_options
*opt
,
983 mmbuffer_t
*result_buf
,
984 const struct diff_filespec
*o
,
985 const struct diff_filespec
*a
,
986 const struct diff_filespec
*b
,
989 const int extra_marker_size
)
991 mmfile_t orig
, src1
, src2
;
992 struct ll_merge_options ll_opts
= {0};
993 char *base
, *name1
, *name2
;
996 ll_opts
.renormalize
= opt
->renormalize
;
997 ll_opts
.extra_marker_size
= extra_marker_size
;
998 ll_opts
.xdl_opts
= opt
->xdl_opts
;
1000 if (opt
->call_depth
) {
1001 ll_opts
.virtual_ancestor
= 1;
1002 ll_opts
.variant
= 0;
1004 switch (opt
->recursive_variant
) {
1005 case MERGE_RECURSIVE_OURS
:
1006 ll_opts
.variant
= XDL_MERGE_FAVOR_OURS
;
1008 case MERGE_RECURSIVE_THEIRS
:
1009 ll_opts
.variant
= XDL_MERGE_FAVOR_THEIRS
;
1012 ll_opts
.variant
= 0;
1017 assert(a
->path
&& b
->path
&& o
->path
&& opt
->ancestor
);
1018 if (strcmp(a
->path
, b
->path
) || strcmp(a
->path
, o
->path
) != 0) {
1019 base
= mkpathdup("%s:%s", opt
->ancestor
, o
->path
);
1020 name1
= mkpathdup("%s:%s", branch1
, a
->path
);
1021 name2
= mkpathdup("%s:%s", branch2
, b
->path
);
1023 base
= mkpathdup("%s", opt
->ancestor
);
1024 name1
= mkpathdup("%s", branch1
);
1025 name2
= mkpathdup("%s", branch2
);
1028 read_mmblob(&orig
, &o
->oid
);
1029 read_mmblob(&src1
, &a
->oid
);
1030 read_mmblob(&src2
, &b
->oid
);
1032 merge_status
= ll_merge(result_buf
, a
->path
, &orig
, base
,
1033 &src1
, name1
, &src2
, name2
,
1034 opt
->repo
->index
, &ll_opts
);
1042 return merge_status
;
1045 static int find_first_merges(struct repository
*repo
,
1046 struct object_array
*result
, const char *path
,
1047 struct commit
*a
, struct commit
*b
)
1050 struct object_array merges
= OBJECT_ARRAY_INIT
;
1051 struct commit
*commit
;
1052 int contains_another
;
1054 char merged_revision
[GIT_MAX_HEXSZ
+ 2];
1055 const char *rev_args
[] = { "rev-list", "--merges", "--ancestry-path",
1056 "--all", merged_revision
, NULL
};
1057 struct rev_info revs
;
1058 struct setup_revision_opt rev_opts
;
1060 memset(result
, 0, sizeof(struct object_array
));
1061 memset(&rev_opts
, 0, sizeof(rev_opts
));
1063 /* get all revisions that merge commit a */
1064 xsnprintf(merged_revision
, sizeof(merged_revision
), "^%s",
1065 oid_to_hex(&a
->object
.oid
));
1066 repo_init_revisions(repo
, &revs
, NULL
);
1067 rev_opts
.submodule
= path
;
1068 /* FIXME: can't handle linked worktrees in submodules yet */
1069 revs
.single_worktree
= path
!= NULL
;
1070 setup_revisions(ARRAY_SIZE(rev_args
)-1, rev_args
, &revs
, &rev_opts
);
1072 /* save all revisions from the above list that contain b */
1073 if (prepare_revision_walk(&revs
))
1074 die("revision walk setup failed");
1075 while ((commit
= get_revision(&revs
)) != NULL
) {
1076 struct object
*o
= &(commit
->object
);
1077 if (in_merge_bases(b
, commit
))
1078 add_object_array(o
, NULL
, &merges
);
1080 reset_revision_walk();
1082 /* Now we've got all merges that contain a and b. Prune all
1083 * merges that contain another found merge and save them in
1086 for (i
= 0; i
< merges
.nr
; i
++) {
1087 struct commit
*m1
= (struct commit
*) merges
.objects
[i
].item
;
1089 contains_another
= 0;
1090 for (j
= 0; j
< merges
.nr
; j
++) {
1091 struct commit
*m2
= (struct commit
*) merges
.objects
[j
].item
;
1092 if (i
!= j
&& in_merge_bases(m2
, m1
)) {
1093 contains_another
= 1;
1098 if (!contains_another
)
1099 add_object_array(merges
.objects
[i
].item
, NULL
, result
);
1102 object_array_clear(&merges
);
1106 static void print_commit(struct commit
*commit
)
1108 struct strbuf sb
= STRBUF_INIT
;
1109 struct pretty_print_context ctx
= {0};
1110 ctx
.date_mode
.type
= DATE_NORMAL
;
1111 format_commit_message(commit
, " %h: %m %s", &sb
, &ctx
);
1112 fprintf(stderr
, "%s\n", sb
.buf
);
1113 strbuf_release(&sb
);
1116 static int is_valid(const struct diff_filespec
*dfs
)
1118 return dfs
->mode
!= 0 && !is_null_oid(&dfs
->oid
);
1121 static int merge_submodule(struct merge_options
*opt
,
1122 struct object_id
*result
, const char *path
,
1123 const struct object_id
*base
, const struct object_id
*a
,
1124 const struct object_id
*b
)
1126 struct commit
*commit_base
, *commit_a
, *commit_b
;
1128 struct object_array merges
;
1131 int search
= !opt
->call_depth
;
1133 /* store a in result in case we fail */
1136 /* we can not handle deletion conflicts */
1137 if (is_null_oid(base
))
1144 if (add_submodule_odb(path
)) {
1145 output(opt
, 1, _("Failed to merge submodule %s (not checked out)"), path
);
1149 if (!(commit_base
= lookup_commit_reference(opt
->repo
, base
)) ||
1150 !(commit_a
= lookup_commit_reference(opt
->repo
, a
)) ||
1151 !(commit_b
= lookup_commit_reference(opt
->repo
, b
))) {
1152 output(opt
, 1, _("Failed to merge submodule %s (commits not present)"), path
);
1156 /* check whether both changes are forward */
1157 if (!in_merge_bases(commit_base
, commit_a
) ||
1158 !in_merge_bases(commit_base
, commit_b
)) {
1159 output(opt
, 1, _("Failed to merge submodule %s (commits don't follow merge-base)"), path
);
1163 /* Case #1: a is contained in b or vice versa */
1164 if (in_merge_bases(commit_a
, commit_b
)) {
1167 output(opt
, 3, _("Fast-forwarding submodule %s to the following commit:"), path
);
1168 output_commit_title(opt
, commit_b
);
1169 } else if (show(opt
, 2))
1170 output(opt
, 2, _("Fast-forwarding submodule %s"), path
);
1176 if (in_merge_bases(commit_b
, commit_a
)) {
1179 output(opt
, 3, _("Fast-forwarding submodule %s to the following commit:"), path
);
1180 output_commit_title(opt
, commit_a
);
1181 } else if (show(opt
, 2))
1182 output(opt
, 2, _("Fast-forwarding submodule %s"), path
);
1190 * Case #2: There are one or more merges that contain a and b in
1191 * the submodule. If there is only one, then present it as a
1192 * suggestion to the user, but leave it marked unmerged so the
1193 * user needs to confirm the resolution.
1196 /* Skip the search if makes no sense to the calling context. */
1200 /* find commit which merges them */
1201 parent_count
= find_first_merges(opt
->repo
, &merges
, path
,
1202 commit_a
, commit_b
);
1203 switch (parent_count
) {
1205 output(opt
, 1, _("Failed to merge submodule %s (merge following commits not found)"), path
);
1209 output(opt
, 1, _("Failed to merge submodule %s (not fast-forward)"), path
);
1210 output(opt
, 2, _("Found a possible merge resolution for the submodule:\n"));
1211 print_commit((struct commit
*) merges
.objects
[0].item
);
1213 "If this is correct simply add it to the index "
1216 " git update-index --cacheinfo 160000 %s \"%s\"\n\n"
1217 "which will accept this suggestion.\n"),
1218 oid_to_hex(&merges
.objects
[0].item
->oid
), path
);
1222 output(opt
, 1, _("Failed to merge submodule %s (multiple merges found)"), path
);
1223 for (i
= 0; i
< merges
.nr
; i
++)
1224 print_commit((struct commit
*) merges
.objects
[i
].item
);
1227 object_array_clear(&merges
);
1231 static int merge_mode_and_contents(struct merge_options
*opt
,
1232 const struct diff_filespec
*o
,
1233 const struct diff_filespec
*a
,
1234 const struct diff_filespec
*b
,
1235 const char *filename
,
1236 const char *branch1
,
1237 const char *branch2
,
1238 const int extra_marker_size
,
1239 struct merge_file_info
*result
)
1241 if (opt
->branch1
!= branch1
) {
1243 * It's weird getting a reverse merge with HEAD on the bottom
1244 * side of the conflict markers and the other branch on the
1247 return merge_mode_and_contents(opt
, o
, b
, a
,
1250 extra_marker_size
, result
);
1256 if ((S_IFMT
& a
->mode
) != (S_IFMT
& b
->mode
)) {
1258 if (S_ISREG(a
->mode
)) {
1259 result
->blob
.mode
= a
->mode
;
1260 oidcpy(&result
->blob
.oid
, &a
->oid
);
1262 result
->blob
.mode
= b
->mode
;
1263 oidcpy(&result
->blob
.oid
, &b
->oid
);
1266 if (!oid_eq(&a
->oid
, &o
->oid
) && !oid_eq(&b
->oid
, &o
->oid
))
1272 if (a
->mode
== b
->mode
|| a
->mode
== o
->mode
)
1273 result
->blob
.mode
= b
->mode
;
1275 result
->blob
.mode
= a
->mode
;
1276 if (b
->mode
!= o
->mode
) {
1282 if (oid_eq(&a
->oid
, &b
->oid
) || oid_eq(&a
->oid
, &o
->oid
))
1283 oidcpy(&result
->blob
.oid
, &b
->oid
);
1284 else if (oid_eq(&b
->oid
, &o
->oid
))
1285 oidcpy(&result
->blob
.oid
, &a
->oid
);
1286 else if (S_ISREG(a
->mode
)) {
1287 mmbuffer_t result_buf
;
1288 int ret
= 0, merge_status
;
1290 merge_status
= merge_3way(opt
, &result_buf
, o
, a
, b
,
1294 if ((merge_status
< 0) || !result_buf
.ptr
)
1295 ret
= err(opt
, _("Failed to execute internal merge"));
1298 write_object_file(result_buf
.ptr
, result_buf
.size
,
1299 blob_type
, &result
->blob
.oid
))
1300 ret
= err(opt
, _("Unable to add %s to database"),
1303 free(result_buf
.ptr
);
1306 result
->clean
= (merge_status
== 0);
1307 } else if (S_ISGITLINK(a
->mode
)) {
1308 result
->clean
= merge_submodule(opt
, &result
->blob
.oid
,
1313 } else if (S_ISLNK(a
->mode
)) {
1314 switch (opt
->recursive_variant
) {
1315 case MERGE_RECURSIVE_NORMAL
:
1316 oidcpy(&result
->blob
.oid
, &a
->oid
);
1317 if (!oid_eq(&a
->oid
, &b
->oid
))
1320 case MERGE_RECURSIVE_OURS
:
1321 oidcpy(&result
->blob
.oid
, &a
->oid
);
1323 case MERGE_RECURSIVE_THEIRS
:
1324 oidcpy(&result
->blob
.oid
, &b
->oid
);
1328 BUG("unsupported object type in the tree");
1332 output(opt
, 2, _("Auto-merging %s"), filename
);
1337 static int handle_rename_via_dir(struct merge_options
*opt
,
1338 struct rename_conflict_info
*ci
)
1341 * Handle file adds that need to be renamed due to directory rename
1342 * detection. This differs from handle_rename_normal, because
1343 * there is no content merge to do; just move the file into the
1344 * desired final location.
1346 const struct rename
*ren
= ci
->ren1
;
1347 const struct diff_filespec
*dest
= ren
->pair
->two
;
1348 char *file_path
= dest
->path
;
1349 int mark_conflicted
= (opt
->detect_directory_renames
==
1350 MERGE_DIRECTORY_RENAMES_CONFLICT
);
1351 assert(ren
->dir_rename_original_dest
);
1353 if (!opt
->call_depth
&& would_lose_untracked(opt
, dest
->path
)) {
1354 mark_conflicted
= 1;
1355 file_path
= unique_path(opt
, dest
->path
, ren
->branch
);
1356 output(opt
, 1, _("Error: Refusing to lose untracked file at %s; "
1357 "writing to %s instead."),
1358 dest
->path
, file_path
);
1361 if (mark_conflicted
) {
1363 * Write the file in worktree at file_path. In the index,
1364 * only record the file at dest->path in the appropriate
1367 if (update_file(opt
, 0, dest
, file_path
))
1369 if (file_path
!= dest
->path
)
1371 if (update_stages(opt
, dest
->path
, NULL
,
1372 ren
->branch
== opt
->branch1
? dest
: NULL
,
1373 ren
->branch
== opt
->branch1
? NULL
: dest
))
1375 return 0; /* not clean, but conflicted */
1377 /* Update dest->path both in index and in worktree */
1378 if (update_file(opt
, 1, dest
, dest
->path
))
1380 return 1; /* clean */
1384 static int handle_change_delete(struct merge_options
*opt
,
1385 const char *path
, const char *old_path
,
1386 const struct diff_filespec
*o
,
1387 const struct diff_filespec
*changed
,
1388 const char *change_branch
,
1389 const char *delete_branch
,
1390 const char *change
, const char *change_past
)
1392 char *alt_path
= NULL
;
1393 const char *update_path
= path
;
1396 if (dir_in_way(opt
->repo
->index
, path
, !opt
->call_depth
, 0) ||
1397 (!opt
->call_depth
&& would_lose_untracked(opt
, path
))) {
1398 update_path
= alt_path
= unique_path(opt
, path
, change_branch
);
1401 if (opt
->call_depth
) {
1403 * We cannot arbitrarily accept either a_sha or b_sha as
1404 * correct; since there is no true "middle point" between
1405 * them, simply reuse the base version for virtual merge base.
1407 ret
= remove_file_from_index(opt
->repo
->index
, path
);
1409 ret
= update_file(opt
, 0, o
, update_path
);
1412 * Despite the four nearly duplicate messages and argument
1413 * lists below and the ugliness of the nested if-statements,
1414 * having complete messages makes the job easier for
1417 * The slight variance among the cases is due to the fact
1419 * 1) directory/file conflicts (in effect if
1420 * !alt_path) could cause us to need to write the
1421 * file to a different path.
1422 * 2) renames (in effect if !old_path) could mean that
1423 * there are two names for the path that the user
1424 * may know the file by.
1428 output(opt
, 1, _("CONFLICT (%s/delete): %s deleted in %s "
1429 "and %s in %s. Version %s of %s left in tree."),
1430 change
, path
, delete_branch
, change_past
,
1431 change_branch
, change_branch
, path
);
1433 output(opt
, 1, _("CONFLICT (%s/delete): %s deleted in %s "
1434 "and %s to %s in %s. Version %s of %s left in tree."),
1435 change
, old_path
, delete_branch
, change_past
, path
,
1436 change_branch
, change_branch
, path
);
1440 output(opt
, 1, _("CONFLICT (%s/delete): %s deleted in %s "
1441 "and %s in %s. Version %s of %s left in tree at %s."),
1442 change
, path
, delete_branch
, change_past
,
1443 change_branch
, change_branch
, path
, alt_path
);
1445 output(opt
, 1, _("CONFLICT (%s/delete): %s deleted in %s "
1446 "and %s to %s in %s. Version %s of %s left in tree at %s."),
1447 change
, old_path
, delete_branch
, change_past
, path
,
1448 change_branch
, change_branch
, path
, alt_path
);
1452 * No need to call update_file() on path when change_branch ==
1453 * opt->branch1 && !alt_path, since that would needlessly touch
1454 * path. We could call update_file_flags() with update_cache=0
1455 * and update_wd=0, but that's a no-op.
1457 if (change_branch
!= opt
->branch1
|| alt_path
)
1458 ret
= update_file(opt
, 0, changed
, update_path
);
1465 static int handle_rename_delete(struct merge_options
*opt
,
1466 struct rename_conflict_info
*ci
)
1468 const struct rename
*ren
= ci
->ren1
;
1469 const struct diff_filespec
*orig
= ren
->pair
->one
;
1470 const struct diff_filespec
*dest
= ren
->pair
->two
;
1471 const char *rename_branch
= ren
->branch
;
1472 const char *delete_branch
= (opt
->branch1
== ren
->branch
?
1473 opt
->branch2
: opt
->branch1
);
1475 if (handle_change_delete(opt
,
1476 opt
->call_depth
? orig
->path
: dest
->path
,
1477 opt
->call_depth
? NULL
: orig
->path
,
1479 rename_branch
, delete_branch
,
1480 _("rename"), _("renamed")))
1483 if (opt
->call_depth
)
1484 return remove_file_from_index(opt
->repo
->index
, dest
->path
);
1486 return update_stages(opt
, dest
->path
, NULL
,
1487 rename_branch
== opt
->branch1
? dest
: NULL
,
1488 rename_branch
== opt
->branch1
? NULL
: dest
);
1491 static int handle_file_collision(struct merge_options
*opt
,
1492 const char *collide_path
,
1493 const char *prev_path1
,
1494 const char *prev_path2
,
1495 const char *branch1
, const char *branch2
,
1496 struct diff_filespec
*a
,
1497 struct diff_filespec
*b
)
1499 struct merge_file_info mfi
;
1500 struct diff_filespec null
;
1501 char *alt_path
= NULL
;
1502 const char *update_path
= collide_path
;
1505 * It's easiest to get the correct things into stage 2 and 3, and
1506 * to make sure that the content merge puts HEAD before the other
1507 * branch if we just ensure that branch1 == opt->branch1. So, simply
1508 * flip arguments around if we don't have that.
1510 if (branch1
!= opt
->branch1
) {
1511 return handle_file_collision(opt
, collide_path
,
1512 prev_path2
, prev_path1
,
1518 * In the recursive case, we just opt to undo renames
1520 if (opt
->call_depth
&& (prev_path1
|| prev_path2
)) {
1521 /* Put first file (a->oid, a->mode) in its original spot */
1523 if (update_file(opt
, 1, a
, prev_path1
))
1526 if (update_file(opt
, 1, a
, collide_path
))
1530 /* Put second file (b->oid, b->mode) in its original spot */
1532 if (update_file(opt
, 1, b
, prev_path2
))
1535 if (update_file(opt
, 1, b
, collide_path
))
1539 /* Don't leave something at collision path if unrenaming both */
1540 if (prev_path1
&& prev_path2
)
1541 remove_file(opt
, 1, collide_path
, 0);
1546 /* Remove rename sources if rename/add or rename/rename(2to1) */
1548 remove_file(opt
, 1, prev_path1
,
1549 opt
->call_depth
|| would_lose_untracked(opt
, prev_path1
));
1551 remove_file(opt
, 1, prev_path2
,
1552 opt
->call_depth
|| would_lose_untracked(opt
, prev_path2
));
1555 * Remove the collision path, if it wouldn't cause dirty contents
1556 * or an untracked file to get lost. We'll either overwrite with
1557 * merged contents, or just write out to differently named files.
1559 if (was_dirty(opt
, collide_path
)) {
1560 output(opt
, 1, _("Refusing to lose dirty file at %s"),
1562 update_path
= alt_path
= unique_path(opt
, collide_path
, "merged");
1563 } else if (would_lose_untracked(opt
, collide_path
)) {
1565 * Only way we get here is if both renames were from
1566 * a directory rename AND user had an untracked file
1567 * at the location where both files end up after the
1568 * two directory renames. See testcase 10d of t6043.
1570 output(opt
, 1, _("Refusing to lose untracked file at "
1571 "%s, even though it's in the way."),
1573 update_path
= alt_path
= unique_path(opt
, collide_path
, "merged");
1576 * FIXME: It's possible that the two files are identical
1577 * and that the current working copy happens to match, in
1578 * which case we are unnecessarily touching the working
1579 * tree file. It's not a likely enough scenario that I
1580 * want to code up the checks for it and a better fix is
1581 * available if we restructure how unpack_trees() and
1582 * merge-recursive interoperate anyway, so punting for
1585 remove_file(opt
, 0, collide_path
, 0);
1588 /* Store things in diff_filespecs for functions that need it */
1589 null
.path
= (char *)collide_path
;
1590 oidcpy(&null
.oid
, &null_oid
);
1593 if (merge_mode_and_contents(opt
, &null
, a
, b
, collide_path
,
1594 branch1
, branch2
, opt
->call_depth
* 2, &mfi
))
1596 mfi
.clean
&= !alt_path
;
1597 if (update_file(opt
, mfi
.clean
, &mfi
.blob
, update_path
))
1599 if (!mfi
.clean
&& !opt
->call_depth
&&
1600 update_stages(opt
, collide_path
, NULL
, a
, b
))
1604 * FIXME: If both a & b both started with conflicts (only possible
1605 * if they came from a rename/rename(2to1)), but had IDENTICAL
1606 * contents including those conflicts, then in the next line we claim
1607 * it was clean. If someone cares about this case, we should have the
1608 * caller notify us if we started with conflicts.
1613 static int handle_rename_add(struct merge_options
*opt
,
1614 struct rename_conflict_info
*ci
)
1616 /* a was renamed to c, and a separate c was added. */
1617 struct diff_filespec
*a
= ci
->ren1
->pair
->one
;
1618 struct diff_filespec
*c
= ci
->ren1
->pair
->two
;
1619 char *path
= c
->path
;
1620 char *prev_path_desc
;
1621 struct merge_file_info mfi
;
1623 const char *rename_branch
= ci
->ren1
->branch
;
1624 const char *add_branch
= (opt
->branch1
== rename_branch
?
1625 opt
->branch2
: opt
->branch1
);
1626 int other_stage
= (ci
->ren1
->branch
== opt
->branch1
? 3 : 2);
1628 output(opt
, 1, _("CONFLICT (rename/add): "
1629 "Rename %s->%s in %s. Added %s in %s"),
1630 a
->path
, c
->path
, rename_branch
,
1631 c
->path
, add_branch
);
1633 prev_path_desc
= xstrfmt("version of %s from %s", path
, a
->path
);
1634 ci
->ren1
->src_entry
->stages
[other_stage
].path
= a
->path
;
1635 if (merge_mode_and_contents(opt
, a
, c
,
1636 &ci
->ren1
->src_entry
->stages
[other_stage
],
1638 opt
->branch1
, opt
->branch2
,
1639 1 + opt
->call_depth
* 2, &mfi
))
1641 free(prev_path_desc
);
1643 ci
->ren1
->dst_entry
->stages
[other_stage
].path
= mfi
.blob
.path
= c
->path
;
1644 return handle_file_collision(opt
,
1645 c
->path
, a
->path
, NULL
,
1646 rename_branch
, add_branch
,
1648 &ci
->ren1
->dst_entry
->stages
[other_stage
]);
1651 static char *find_path_for_conflict(struct merge_options
*opt
,
1653 const char *branch1
,
1654 const char *branch2
)
1656 char *new_path
= NULL
;
1657 if (dir_in_way(opt
->repo
->index
, path
, !opt
->call_depth
, 0)) {
1658 new_path
= unique_path(opt
, path
, branch1
);
1659 output(opt
, 1, _("%s is a directory in %s adding "
1661 path
, branch2
, new_path
);
1662 } else if (would_lose_untracked(opt
, path
)) {
1663 new_path
= unique_path(opt
, path
, branch1
);
1664 output(opt
, 1, _("Refusing to lose untracked file"
1665 " at %s; adding as %s instead"),
1672 static int handle_rename_rename_1to2(struct merge_options
*opt
,
1673 struct rename_conflict_info
*ci
)
1675 /* One file was renamed in both branches, but to different names. */
1676 struct merge_file_info mfi
;
1677 struct diff_filespec
*add
;
1678 struct diff_filespec
*o
= ci
->ren1
->pair
->one
;
1679 struct diff_filespec
*a
= ci
->ren1
->pair
->two
;
1680 struct diff_filespec
*b
= ci
->ren2
->pair
->two
;
1683 output(opt
, 1, _("CONFLICT (rename/rename): "
1684 "Rename \"%s\"->\"%s\" in branch \"%s\" "
1685 "rename \"%s\"->\"%s\" in \"%s\"%s"),
1686 o
->path
, a
->path
, ci
->ren1
->branch
,
1687 o
->path
, b
->path
, ci
->ren2
->branch
,
1688 opt
->call_depth
? _(" (left unresolved)") : "");
1690 path_desc
= xstrfmt("%s and %s, both renamed from %s",
1691 a
->path
, b
->path
, o
->path
);
1692 if (merge_mode_and_contents(opt
, o
, a
, b
, path_desc
,
1693 ci
->ren1
->branch
, ci
->ren2
->branch
,
1694 opt
->call_depth
* 2, &mfi
))
1698 if (opt
->call_depth
) {
1700 * FIXME: For rename/add-source conflicts (if we could detect
1701 * such), this is wrong. We should instead find a unique
1702 * pathname and then either rename the add-source file to that
1703 * unique path, or use that unique path instead of src here.
1705 if (update_file(opt
, 0, &mfi
.blob
, o
->path
))
1709 * Above, we put the merged content at the merge-base's
1710 * path. Now we usually need to delete both a->path and
1711 * b->path. However, the rename on each side of the merge
1712 * could also be involved in a rename/add conflict. In
1713 * such cases, we should keep the added file around,
1714 * resolving the conflict at that path in its favor.
1716 add
= &ci
->ren1
->dst_entry
->stages
[2 ^ 1];
1717 if (is_valid(add
)) {
1718 if (update_file(opt
, 0, add
, a
->path
))
1722 remove_file_from_index(opt
->repo
->index
, a
->path
);
1723 add
= &ci
->ren2
->dst_entry
->stages
[3 ^ 1];
1724 if (is_valid(add
)) {
1725 if (update_file(opt
, 0, add
, b
->path
))
1729 remove_file_from_index(opt
->repo
->index
, b
->path
);
1732 * For each destination path, we need to see if there is a
1733 * rename/add collision. If not, we can write the file out
1734 * to the specified location.
1736 add
= &ci
->ren1
->dst_entry
->stages
[2 ^ 1];
1737 if (is_valid(add
)) {
1738 add
->path
= mfi
.blob
.path
= a
->path
;
1739 if (handle_file_collision(opt
, a
->path
,
1743 &mfi
.blob
, add
) < 0)
1746 char *new_path
= find_path_for_conflict(opt
, a
->path
,
1749 if (update_file(opt
, 0, &mfi
.blob
,
1750 new_path
? new_path
: a
->path
))
1753 if (update_stages(opt
, a
->path
, NULL
, a
, NULL
))
1757 add
= &ci
->ren2
->dst_entry
->stages
[3 ^ 1];
1758 if (is_valid(add
)) {
1759 add
->path
= mfi
.blob
.path
= b
->path
;
1760 if (handle_file_collision(opt
, b
->path
,
1764 add
, &mfi
.blob
) < 0)
1767 char *new_path
= find_path_for_conflict(opt
, b
->path
,
1770 if (update_file(opt
, 0, &mfi
.blob
,
1771 new_path
? new_path
: b
->path
))
1774 if (update_stages(opt
, b
->path
, NULL
, NULL
, b
))
1782 static int handle_rename_rename_2to1(struct merge_options
*opt
,
1783 struct rename_conflict_info
*ci
)
1785 /* Two files, a & b, were renamed to the same thing, c. */
1786 struct diff_filespec
*a
= ci
->ren1
->pair
->one
;
1787 struct diff_filespec
*b
= ci
->ren2
->pair
->one
;
1788 struct diff_filespec
*c1
= ci
->ren1
->pair
->two
;
1789 struct diff_filespec
*c2
= ci
->ren2
->pair
->two
;
1790 char *path
= c1
->path
; /* == c2->path */
1791 char *path_side_1_desc
;
1792 char *path_side_2_desc
;
1793 struct merge_file_info mfi_c1
;
1794 struct merge_file_info mfi_c2
;
1795 int ostage1
, ostage2
;
1797 output(opt
, 1, _("CONFLICT (rename/rename): "
1798 "Rename %s->%s in %s. "
1799 "Rename %s->%s in %s"),
1800 a
->path
, c1
->path
, ci
->ren1
->branch
,
1801 b
->path
, c2
->path
, ci
->ren2
->branch
);
1803 path_side_1_desc
= xstrfmt("version of %s from %s", path
, a
->path
);
1804 path_side_2_desc
= xstrfmt("version of %s from %s", path
, b
->path
);
1805 ostage1
= ci
->ren1
->branch
== opt
->branch1
? 3 : 2;
1806 ostage2
= ostage1
^ 1;
1807 ci
->ren1
->src_entry
->stages
[ostage1
].path
= a
->path
;
1808 ci
->ren2
->src_entry
->stages
[ostage2
].path
= b
->path
;
1809 if (merge_mode_and_contents(opt
, a
, c1
,
1810 &ci
->ren1
->src_entry
->stages
[ostage1
],
1812 opt
->branch1
, opt
->branch2
,
1813 1 + opt
->call_depth
* 2, &mfi_c1
) ||
1814 merge_mode_and_contents(opt
, b
,
1815 &ci
->ren2
->src_entry
->stages
[ostage2
],
1816 c2
, path_side_2_desc
,
1817 opt
->branch1
, opt
->branch2
,
1818 1 + opt
->call_depth
* 2, &mfi_c2
))
1820 free(path_side_1_desc
);
1821 free(path_side_2_desc
);
1822 mfi_c1
.blob
.path
= path
;
1823 mfi_c2
.blob
.path
= path
;
1825 return handle_file_collision(opt
, path
, a
->path
, b
->path
,
1826 ci
->ren1
->branch
, ci
->ren2
->branch
,
1827 &mfi_c1
.blob
, &mfi_c2
.blob
);
1831 * Get the diff_filepairs changed between o_tree and tree.
1833 static struct diff_queue_struct
*get_diffpairs(struct merge_options
*opt
,
1834 struct tree
*o_tree
,
1837 struct diff_queue_struct
*ret
;
1838 struct diff_options opts
;
1840 repo_diff_setup(opt
->repo
, &opts
);
1841 opts
.flags
.recursive
= 1;
1842 opts
.flags
.rename_empty
= 0;
1843 opts
.detect_rename
= merge_detect_rename(opt
);
1845 * We do not have logic to handle the detection of copies. In
1846 * fact, it may not even make sense to add such logic: would we
1847 * really want a change to a base file to be propagated through
1848 * multiple other files by a merge?
1850 if (opts
.detect_rename
> DIFF_DETECT_RENAME
)
1851 opts
.detect_rename
= DIFF_DETECT_RENAME
;
1852 opts
.rename_limit
= opt
->merge_rename_limit
>= 0 ? opt
->merge_rename_limit
:
1853 opt
->diff_rename_limit
>= 0 ? opt
->diff_rename_limit
:
1855 opts
.rename_score
= opt
->rename_score
;
1856 opts
.show_rename_progress
= opt
->show_rename_progress
;
1857 opts
.output_format
= DIFF_FORMAT_NO_OUTPUT
;
1858 diff_setup_done(&opts
);
1859 diff_tree_oid(&o_tree
->object
.oid
, &tree
->object
.oid
, "", &opts
);
1860 diffcore_std(&opts
);
1861 if (opts
.needed_rename_limit
> opt
->needed_rename_limit
)
1862 opt
->needed_rename_limit
= opts
.needed_rename_limit
;
1864 ret
= xmalloc(sizeof(*ret
));
1865 *ret
= diff_queued_diff
;
1867 opts
.output_format
= DIFF_FORMAT_NO_OUTPUT
;
1868 diff_queued_diff
.nr
= 0;
1869 diff_queued_diff
.queue
= NULL
;
1874 static int tree_has_path(struct repository
*r
, struct tree
*tree
,
1877 struct object_id hashy
;
1878 unsigned short mode_o
;
1880 return !get_tree_entry(r
,
1881 &tree
->object
.oid
, path
,
1886 * Return a new string that replaces the beginning portion (which matches
1887 * entry->dir), with entry->new_dir. In perl-speak:
1888 * new_path_name = (old_path =~ s/entry->dir/entry->new_dir/);
1890 * Caller must ensure that old_path starts with entry->dir + '/'.
1892 static char *apply_dir_rename(struct dir_rename_entry
*entry
,
1893 const char *old_path
)
1895 struct strbuf new_path
= STRBUF_INIT
;
1898 if (entry
->non_unique_new_dir
)
1901 oldlen
= strlen(entry
->dir
);
1902 newlen
= entry
->new_dir
.len
+ (strlen(old_path
) - oldlen
) + 1;
1903 strbuf_grow(&new_path
, newlen
);
1904 strbuf_addbuf(&new_path
, &entry
->new_dir
);
1905 strbuf_addstr(&new_path
, &old_path
[oldlen
]);
1907 return strbuf_detach(&new_path
, NULL
);
1910 static void get_renamed_dir_portion(const char *old_path
, const char *new_path
,
1911 char **old_dir
, char **new_dir
)
1913 char *end_of_old
, *end_of_new
;
1914 int old_len
, new_len
;
1921 * "a/b/c/d/e/foo.c" -> "a/b/some/thing/else/e/foo.c"
1922 * the "e/foo.c" part is the same, we just want to know that
1923 * "a/b/c/d" was renamed to "a/b/some/thing/else"
1924 * so, for this example, this function returns "a/b/c/d" in
1925 * *old_dir and "a/b/some/thing/else" in *new_dir.
1927 * Also, if the basename of the file changed, we don't care. We
1928 * want to know which portion of the directory, if any, changed.
1930 end_of_old
= strrchr(old_path
, '/');
1931 end_of_new
= strrchr(new_path
, '/');
1933 if (end_of_old
== NULL
|| end_of_new
== NULL
)
1935 while (*--end_of_new
== *--end_of_old
&&
1936 end_of_old
!= old_path
&&
1937 end_of_new
!= new_path
)
1938 ; /* Do nothing; all in the while loop */
1940 * We've found the first non-matching character in the directory
1941 * paths. That means the current directory we were comparing
1942 * represents the rename. Move end_of_old and end_of_new back
1943 * to the full directory name.
1945 if (*end_of_old
== '/')
1947 if (*end_of_old
!= '/')
1949 end_of_old
= strchr(end_of_old
, '/');
1950 end_of_new
= strchr(end_of_new
, '/');
1953 * It may have been the case that old_path and new_path were the same
1954 * directory all along. Don't claim a rename if they're the same.
1956 old_len
= end_of_old
- old_path
;
1957 new_len
= end_of_new
- new_path
;
1959 if (old_len
!= new_len
|| strncmp(old_path
, new_path
, old_len
)) {
1960 *old_dir
= xstrndup(old_path
, old_len
);
1961 *new_dir
= xstrndup(new_path
, new_len
);
1965 static void remove_hashmap_entries(struct hashmap
*dir_renames
,
1966 struct string_list
*items_to_remove
)
1969 struct dir_rename_entry
*entry
;
1971 for (i
= 0; i
< items_to_remove
->nr
; i
++) {
1972 entry
= items_to_remove
->items
[i
].util
;
1973 hashmap_remove(dir_renames
, entry
, NULL
);
1975 string_list_clear(items_to_remove
, 0);
1979 * See if there is a directory rename for path, and if there are any file
1980 * level conflicts for the renamed location. If there is a rename and
1981 * there are no conflicts, return the new name. Otherwise, return NULL.
1983 static char *handle_path_level_conflicts(struct merge_options
*opt
,
1985 struct dir_rename_entry
*entry
,
1986 struct hashmap
*collisions
,
1989 char *new_path
= NULL
;
1990 struct collision_entry
*collision_ent
;
1992 struct strbuf collision_paths
= STRBUF_INIT
;
1995 * entry has the mapping of old directory name to new directory name
1996 * that we want to apply to path.
1998 new_path
= apply_dir_rename(entry
, path
);
2001 /* This should only happen when entry->non_unique_new_dir set */
2002 if (!entry
->non_unique_new_dir
)
2003 BUG("entry->non_unqiue_dir not set and !new_path");
2004 output(opt
, 1, _("CONFLICT (directory rename split): "
2005 "Unclear where to place %s because directory "
2006 "%s was renamed to multiple other directories, "
2007 "with no destination getting a majority of the "
2015 * The caller needs to have ensured that it has pre-populated
2016 * collisions with all paths that map to new_path. Do a quick check
2017 * to ensure that's the case.
2019 collision_ent
= collision_find_entry(collisions
, new_path
);
2020 if (collision_ent
== NULL
)
2021 BUG("collision_ent is NULL");
2024 * Check for one-sided add/add/.../add conflicts, i.e.
2025 * where implicit renames from the other side doing
2026 * directory rename(s) can affect this side of history
2027 * to put multiple paths into the same location. Warn
2028 * and bail on directory renames for such paths.
2030 if (collision_ent
->reported_already
) {
2032 } else if (tree_has_path(opt
->repo
, tree
, new_path
)) {
2033 collision_ent
->reported_already
= 1;
2034 strbuf_add_separated_string_list(&collision_paths
, ", ",
2035 &collision_ent
->source_files
);
2036 output(opt
, 1, _("CONFLICT (implicit dir rename): Existing "
2037 "file/dir at %s in the way of implicit "
2038 "directory rename(s) putting the following "
2039 "path(s) there: %s."),
2040 new_path
, collision_paths
.buf
);
2042 } else if (collision_ent
->source_files
.nr
> 1) {
2043 collision_ent
->reported_already
= 1;
2044 strbuf_add_separated_string_list(&collision_paths
, ", ",
2045 &collision_ent
->source_files
);
2046 output(opt
, 1, _("CONFLICT (implicit dir rename): Cannot map "
2047 "more than one path to %s; implicit directory "
2048 "renames tried to put these paths there: %s"),
2049 new_path
, collision_paths
.buf
);
2053 /* Free memory we no longer need */
2054 strbuf_release(&collision_paths
);
2055 if (!clean
&& new_path
) {
2064 * There are a couple things we want to do at the directory level:
2065 * 1. Check for both sides renaming to the same thing, in order to avoid
2066 * implicit renaming of files that should be left in place. (See
2067 * testcase 6b in t6043 for details.)
2068 * 2. Prune directory renames if there are still files left in the
2069 * the original directory. These represent a partial directory rename,
2070 * i.e. a rename where only some of the files within the directory
2071 * were renamed elsewhere. (Technically, this could be done earlier
2072 * in get_directory_renames(), except that would prevent us from
2073 * doing the previous check and thus failing testcase 6b.)
2074 * 3. Check for rename/rename(1to2) conflicts (at the directory level).
2075 * In the future, we could potentially record this info as well and
2076 * omit reporting rename/rename(1to2) conflicts for each path within
2077 * the affected directories, thus cleaning up the merge output.
2078 * NOTE: We do NOT check for rename/rename(2to1) conflicts at the
2079 * directory level, because merging directories is fine. If it
2080 * causes conflicts for files within those merged directories, then
2081 * that should be detected at the individual path level.
2083 static void handle_directory_level_conflicts(struct merge_options
*opt
,
2084 struct hashmap
*dir_re_head
,
2086 struct hashmap
*dir_re_merge
,
2089 struct hashmap_iter iter
;
2090 struct dir_rename_entry
*head_ent
;
2091 struct dir_rename_entry
*merge_ent
;
2093 struct string_list remove_from_head
= STRING_LIST_INIT_NODUP
;
2094 struct string_list remove_from_merge
= STRING_LIST_INIT_NODUP
;
2096 hashmap_iter_init(dir_re_head
, &iter
);
2097 while ((head_ent
= hashmap_iter_next(&iter
))) {
2098 merge_ent
= dir_rename_find_entry(dir_re_merge
, head_ent
->dir
);
2100 !head_ent
->non_unique_new_dir
&&
2101 !merge_ent
->non_unique_new_dir
&&
2102 !strbuf_cmp(&head_ent
->new_dir
, &merge_ent
->new_dir
)) {
2103 /* 1. Renamed identically; remove it from both sides */
2104 string_list_append(&remove_from_head
,
2105 head_ent
->dir
)->util
= head_ent
;
2106 strbuf_release(&head_ent
->new_dir
);
2107 string_list_append(&remove_from_merge
,
2108 merge_ent
->dir
)->util
= merge_ent
;
2109 strbuf_release(&merge_ent
->new_dir
);
2110 } else if (tree_has_path(opt
->repo
, head
, head_ent
->dir
)) {
2111 /* 2. This wasn't a directory rename after all */
2112 string_list_append(&remove_from_head
,
2113 head_ent
->dir
)->util
= head_ent
;
2114 strbuf_release(&head_ent
->new_dir
);
2118 remove_hashmap_entries(dir_re_head
, &remove_from_head
);
2119 remove_hashmap_entries(dir_re_merge
, &remove_from_merge
);
2121 hashmap_iter_init(dir_re_merge
, &iter
);
2122 while ((merge_ent
= hashmap_iter_next(&iter
))) {
2123 head_ent
= dir_rename_find_entry(dir_re_head
, merge_ent
->dir
);
2124 if (tree_has_path(opt
->repo
, merge
, merge_ent
->dir
)) {
2125 /* 2. This wasn't a directory rename after all */
2126 string_list_append(&remove_from_merge
,
2127 merge_ent
->dir
)->util
= merge_ent
;
2128 } else if (head_ent
&&
2129 !head_ent
->non_unique_new_dir
&&
2130 !merge_ent
->non_unique_new_dir
) {
2131 /* 3. rename/rename(1to2) */
2133 * We can assume it's not rename/rename(1to1) because
2134 * that was case (1), already checked above. So we
2135 * know that head_ent->new_dir and merge_ent->new_dir
2136 * are different strings.
2138 output(opt
, 1, _("CONFLICT (rename/rename): "
2139 "Rename directory %s->%s in %s. "
2140 "Rename directory %s->%s in %s"),
2141 head_ent
->dir
, head_ent
->new_dir
.buf
, opt
->branch1
,
2142 head_ent
->dir
, merge_ent
->new_dir
.buf
, opt
->branch2
);
2143 string_list_append(&remove_from_head
,
2144 head_ent
->dir
)->util
= head_ent
;
2145 strbuf_release(&head_ent
->new_dir
);
2146 string_list_append(&remove_from_merge
,
2147 merge_ent
->dir
)->util
= merge_ent
;
2148 strbuf_release(&merge_ent
->new_dir
);
2152 remove_hashmap_entries(dir_re_head
, &remove_from_head
);
2153 remove_hashmap_entries(dir_re_merge
, &remove_from_merge
);
2156 static struct hashmap
*get_directory_renames(struct diff_queue_struct
*pairs
)
2158 struct hashmap
*dir_renames
;
2159 struct hashmap_iter iter
;
2160 struct dir_rename_entry
*entry
;
2164 * Typically, we think of a directory rename as all files from a
2165 * certain directory being moved to a target directory. However,
2166 * what if someone first moved two files from the original
2167 * directory in one commit, and then renamed the directory
2168 * somewhere else in a later commit? At merge time, we just know
2169 * that files from the original directory went to two different
2170 * places, and that the bulk of them ended up in the same place.
2171 * We want each directory rename to represent where the bulk of the
2172 * files from that directory end up; this function exists to find
2173 * where the bulk of the files went.
2175 * The first loop below simply iterates through the list of file
2176 * renames, finding out how often each directory rename pair
2177 * possibility occurs.
2179 dir_renames
= xmalloc(sizeof(*dir_renames
));
2180 dir_rename_init(dir_renames
);
2181 for (i
= 0; i
< pairs
->nr
; ++i
) {
2182 struct string_list_item
*item
;
2184 struct diff_filepair
*pair
= pairs
->queue
[i
];
2185 char *old_dir
, *new_dir
;
2187 /* File not part of directory rename if it wasn't renamed */
2188 if (pair
->status
!= 'R')
2191 get_renamed_dir_portion(pair
->one
->path
, pair
->two
->path
,
2192 &old_dir
, &new_dir
);
2194 /* Directory didn't change at all; ignore this one. */
2197 entry
= dir_rename_find_entry(dir_renames
, old_dir
);
2199 entry
= xmalloc(sizeof(*entry
));
2200 dir_rename_entry_init(entry
, old_dir
);
2201 hashmap_put(dir_renames
, entry
);
2205 item
= string_list_lookup(&entry
->possible_new_dirs
, new_dir
);
2207 item
= string_list_insert(&entry
->possible_new_dirs
,
2209 item
->util
= xcalloc(1, sizeof(int));
2218 * For each directory with files moved out of it, we find out which
2219 * target directory received the most files so we can declare it to
2220 * be the "winning" target location for the directory rename. This
2221 * winner gets recorded in new_dir. If there is no winner
2222 * (multiple target directories received the same number of files),
2223 * we set non_unique_new_dir. Once we've determined the winner (or
2224 * that there is no winner), we no longer need possible_new_dirs.
2226 hashmap_iter_init(dir_renames
, &iter
);
2227 while ((entry
= hashmap_iter_next(&iter
))) {
2232 for (i
= 0; i
< entry
->possible_new_dirs
.nr
; i
++) {
2233 int *count
= entry
->possible_new_dirs
.items
[i
].util
;
2237 else if (*count
> max
) {
2239 best
= entry
->possible_new_dirs
.items
[i
].string
;
2243 entry
->non_unique_new_dir
= 1;
2245 assert(entry
->new_dir
.len
== 0);
2246 strbuf_addstr(&entry
->new_dir
, best
);
2249 * The relevant directory sub-portion of the original full
2250 * filepaths were xstrndup'ed before inserting into
2251 * possible_new_dirs, and instead of manually iterating the
2252 * list and free'ing each, just lie and tell
2253 * possible_new_dirs that it did the strdup'ing so that it
2254 * will free them for us.
2256 entry
->possible_new_dirs
.strdup_strings
= 1;
2257 string_list_clear(&entry
->possible_new_dirs
, 1);
2263 static struct dir_rename_entry
*check_dir_renamed(const char *path
,
2264 struct hashmap
*dir_renames
)
2266 char *temp
= xstrdup(path
);
2268 struct dir_rename_entry
*entry
= NULL
;
2270 while ((end
= strrchr(temp
, '/'))) {
2272 entry
= dir_rename_find_entry(dir_renames
, temp
);
2280 static void compute_collisions(struct hashmap
*collisions
,
2281 struct hashmap
*dir_renames
,
2282 struct diff_queue_struct
*pairs
)
2287 * Multiple files can be mapped to the same path due to directory
2288 * renames done by the other side of history. Since that other
2289 * side of history could have merged multiple directories into one,
2290 * if our side of history added the same file basename to each of
2291 * those directories, then all N of them would get implicitly
2292 * renamed by the directory rename detection into the same path,
2293 * and we'd get an add/add/.../add conflict, and all those adds
2294 * from *this* side of history. This is not representable in the
2295 * index, and users aren't going to easily be able to make sense of
2296 * it. So we need to provide a good warning about what's
2297 * happening, and fall back to no-directory-rename detection
2298 * behavior for those paths.
2300 * See testcases 9e and all of section 5 from t6043 for examples.
2302 collision_init(collisions
);
2304 for (i
= 0; i
< pairs
->nr
; ++i
) {
2305 struct dir_rename_entry
*dir_rename_ent
;
2306 struct collision_entry
*collision_ent
;
2308 struct diff_filepair
*pair
= pairs
->queue
[i
];
2310 if (pair
->status
!= 'A' && pair
->status
!= 'R')
2312 dir_rename_ent
= check_dir_renamed(pair
->two
->path
,
2314 if (!dir_rename_ent
)
2317 new_path
= apply_dir_rename(dir_rename_ent
, pair
->two
->path
);
2320 * dir_rename_ent->non_unique_new_path is true, which
2321 * means there is no directory rename for us to use,
2322 * which means it won't cause us any additional
2326 collision_ent
= collision_find_entry(collisions
, new_path
);
2327 if (!collision_ent
) {
2328 collision_ent
= xcalloc(1,
2329 sizeof(struct collision_entry
));
2330 hashmap_entry_init(collision_ent
, strhash(new_path
));
2331 hashmap_put(collisions
, collision_ent
);
2332 collision_ent
->target_file
= new_path
;
2336 string_list_insert(&collision_ent
->source_files
,
2341 static char *check_for_directory_rename(struct merge_options
*opt
,
2344 struct hashmap
*dir_renames
,
2345 struct hashmap
*dir_rename_exclusions
,
2346 struct hashmap
*collisions
,
2349 char *new_path
= NULL
;
2350 struct dir_rename_entry
*entry
= check_dir_renamed(path
, dir_renames
);
2351 struct dir_rename_entry
*oentry
= NULL
;
2357 * This next part is a little weird. We do not want to do an
2358 * implicit rename into a directory we renamed on our side, because
2359 * that will result in a spurious rename/rename(1to2) conflict. An
2361 * Base commit: dumbdir/afile, otherdir/bfile
2362 * Side 1: smrtdir/afile, otherdir/bfile
2363 * Side 2: dumbdir/afile, dumbdir/bfile
2364 * Here, while working on Side 1, we could notice that otherdir was
2365 * renamed/merged to dumbdir, and change the diff_filepair for
2366 * otherdir/bfile into a rename into dumbdir/bfile. However, Side
2367 * 2 will notice the rename from dumbdir to smrtdir, and do the
2368 * transitive rename to move it from dumbdir/bfile to
2369 * smrtdir/bfile. That gives us bfile in dumbdir vs being in
2370 * smrtdir, a rename/rename(1to2) conflict. We really just want
2371 * the file to end up in smrtdir. And the way to achieve that is
2372 * to not let Side1 do the rename to dumbdir, since we know that is
2373 * the source of one of our directory renames.
2375 * That's why oentry and dir_rename_exclusions is here.
2377 * As it turns out, this also prevents N-way transient rename
2378 * confusion; See testcases 9c and 9d of t6043.
2380 oentry
= dir_rename_find_entry(dir_rename_exclusions
, entry
->new_dir
.buf
);
2382 output(opt
, 1, _("WARNING: Avoiding applying %s -> %s rename "
2383 "to %s, because %s itself was renamed."),
2384 entry
->dir
, entry
->new_dir
.buf
, path
, entry
->new_dir
.buf
);
2386 new_path
= handle_path_level_conflicts(opt
, path
, entry
,
2388 *clean_merge
&= (new_path
!= NULL
);
2394 static void apply_directory_rename_modifications(struct merge_options
*opt
,
2395 struct diff_filepair
*pair
,
2399 struct tree
*o_tree
,
2400 struct tree
*a_tree
,
2401 struct tree
*b_tree
,
2402 struct string_list
*entries
)
2404 struct string_list_item
*item
;
2405 int stage
= (tree
== a_tree
? 2 : 3);
2409 * In all cases where we can do directory rename detection,
2410 * unpack_trees() will have read pair->two->path into the
2411 * index and the working copy. We need to remove it so that
2412 * we can instead place it at new_path. It is guaranteed to
2413 * not be untracked (unpack_trees() would have errored out
2414 * saying the file would have been overwritten), but it might
2417 update_wd
= !was_dirty(opt
, pair
->two
->path
);
2419 output(opt
, 1, _("Refusing to lose dirty file at %s"),
2421 remove_file(opt
, 1, pair
->two
->path
, !update_wd
);
2423 /* Find or create a new re->dst_entry */
2424 item
= string_list_lookup(entries
, new_path
);
2427 * Since we're renaming on this side of history, and it's
2428 * due to a directory rename on the other side of history
2429 * (which we only allow when the directory in question no
2430 * longer exists on the other side of history), the
2431 * original entry for re->dst_entry is no longer
2434 re
->dst_entry
->processed
= 1;
2437 * ...because we'll be using this new one.
2439 re
->dst_entry
= item
->util
;
2442 * re->dst_entry is for the before-dir-rename path, and we
2443 * need it to hold information for the after-dir-rename
2444 * path. Before creating a new entry, we need to mark the
2445 * old one as unnecessary (...unless it is shared by
2446 * src_entry, i.e. this didn't use to be a rename, in which
2447 * case we can just allow the normal processing to happen
2450 if (pair
->status
== 'R')
2451 re
->dst_entry
->processed
= 1;
2453 re
->dst_entry
= insert_stage_data(opt
->repo
, new_path
,
2454 o_tree
, a_tree
, b_tree
,
2456 item
= string_list_insert(entries
, new_path
);
2457 item
->util
= re
->dst_entry
;
2461 * Update the stage_data with the information about the path we are
2462 * moving into place. That slot will be empty and available for us
2463 * to write to because of the collision checks in
2464 * handle_path_level_conflicts(). In other words,
2465 * re->dst_entry->stages[stage].oid will be the null_oid, so it's
2466 * open for us to write to.
2468 * It may be tempting to actually update the index at this point as
2469 * well, using update_stages_for_stage_data(), but as per the big
2470 * "NOTE" in update_stages(), doing so will modify the current
2471 * in-memory index which will break calls to would_lose_untracked()
2472 * that we need to make. Instead, we need to just make sure that
2473 * the various handle_rename_*() functions update the index
2474 * explicitly rather than relying on unpack_trees() to have done it.
2476 get_tree_entry(opt
->repo
,
2479 &re
->dst_entry
->stages
[stage
].oid
,
2480 &re
->dst_entry
->stages
[stage
].mode
);
2483 * Record the original change status (or 'type' of change). If it
2484 * was originally an add ('A'), this lets us differentiate later
2485 * between a RENAME_DELETE conflict and RENAME_VIA_DIR (they
2486 * otherwise look the same). If it was originally a rename ('R'),
2487 * this lets us remember and report accurately about the transitive
2488 * renaming that occurred via the directory rename detection. Also,
2489 * record the original destination name.
2491 re
->dir_rename_original_type
= pair
->status
;
2492 re
->dir_rename_original_dest
= pair
->two
->path
;
2495 * We don't actually look at pair->status again, but it seems
2496 * pedagogically correct to adjust it.
2501 * Finally, record the new location.
2503 pair
->two
->path
= new_path
;
2507 * Get information of all renames which occurred in 'pairs', making use of
2508 * any implicit directory renames inferred from the other side of history.
2509 * We need the three trees in the merge ('o_tree', 'a_tree' and 'b_tree')
2510 * to be able to associate the correct cache entries with the rename
2511 * information; tree is always equal to either a_tree or b_tree.
2513 static struct string_list
*get_renames(struct merge_options
*opt
,
2515 struct diff_queue_struct
*pairs
,
2516 struct hashmap
*dir_renames
,
2517 struct hashmap
*dir_rename_exclusions
,
2519 struct tree
*o_tree
,
2520 struct tree
*a_tree
,
2521 struct tree
*b_tree
,
2522 struct string_list
*entries
,
2526 struct hashmap collisions
;
2527 struct hashmap_iter iter
;
2528 struct collision_entry
*e
;
2529 struct string_list
*renames
;
2531 compute_collisions(&collisions
, dir_renames
, pairs
);
2532 renames
= xcalloc(1, sizeof(struct string_list
));
2534 for (i
= 0; i
< pairs
->nr
; ++i
) {
2535 struct string_list_item
*item
;
2537 struct diff_filepair
*pair
= pairs
->queue
[i
];
2538 char *new_path
; /* non-NULL only with directory renames */
2540 if (pair
->status
!= 'A' && pair
->status
!= 'R') {
2541 diff_free_filepair(pair
);
2544 new_path
= check_for_directory_rename(opt
, pair
->two
->path
, tree
,
2546 dir_rename_exclusions
,
2549 if (pair
->status
!= 'R' && !new_path
) {
2550 diff_free_filepair(pair
);
2554 re
= xmalloc(sizeof(*re
));
2557 re
->branch
= branch
;
2558 re
->dir_rename_original_type
= '\0';
2559 re
->dir_rename_original_dest
= NULL
;
2560 item
= string_list_lookup(entries
, re
->pair
->one
->path
);
2562 re
->src_entry
= insert_stage_data(opt
->repo
,
2563 re
->pair
->one
->path
,
2564 o_tree
, a_tree
, b_tree
, entries
);
2566 re
->src_entry
= item
->util
;
2568 item
= string_list_lookup(entries
, re
->pair
->two
->path
);
2570 re
->dst_entry
= insert_stage_data(opt
->repo
,
2571 re
->pair
->two
->path
,
2572 o_tree
, a_tree
, b_tree
, entries
);
2574 re
->dst_entry
= item
->util
;
2575 item
= string_list_insert(renames
, pair
->one
->path
);
2578 apply_directory_rename_modifications(opt
, pair
, new_path
,
2584 hashmap_iter_init(&collisions
, &iter
);
2585 while ((e
= hashmap_iter_next(&iter
))) {
2586 free(e
->target_file
);
2587 string_list_clear(&e
->source_files
, 0);
2589 hashmap_free(&collisions
, 1);
2593 static int process_renames(struct merge_options
*opt
,
2594 struct string_list
*a_renames
,
2595 struct string_list
*b_renames
)
2597 int clean_merge
= 1, i
, j
;
2598 struct string_list a_by_dst
= STRING_LIST_INIT_NODUP
;
2599 struct string_list b_by_dst
= STRING_LIST_INIT_NODUP
;
2600 const struct rename
*sre
;
2602 for (i
= 0; i
< a_renames
->nr
; i
++) {
2603 sre
= a_renames
->items
[i
].util
;
2604 string_list_insert(&a_by_dst
, sre
->pair
->two
->path
)->util
2607 for (i
= 0; i
< b_renames
->nr
; i
++) {
2608 sre
= b_renames
->items
[i
].util
;
2609 string_list_insert(&b_by_dst
, sre
->pair
->two
->path
)->util
2613 for (i
= 0, j
= 0; i
< a_renames
->nr
|| j
< b_renames
->nr
;) {
2614 struct string_list
*renames1
, *renames2Dst
;
2615 struct rename
*ren1
= NULL
, *ren2
= NULL
;
2616 const char *ren1_src
, *ren1_dst
;
2617 struct string_list_item
*lookup
;
2619 if (i
>= a_renames
->nr
) {
2620 ren2
= b_renames
->items
[j
++].util
;
2621 } else if (j
>= b_renames
->nr
) {
2622 ren1
= a_renames
->items
[i
++].util
;
2624 int compare
= strcmp(a_renames
->items
[i
].string
,
2625 b_renames
->items
[j
].string
);
2627 ren1
= a_renames
->items
[i
++].util
;
2629 ren2
= b_renames
->items
[j
++].util
;
2632 /* TODO: refactor, so that 1/2 are not needed */
2634 renames1
= a_renames
;
2635 renames2Dst
= &b_by_dst
;
2637 renames1
= b_renames
;
2638 renames2Dst
= &a_by_dst
;
2642 if (ren1
->processed
)
2644 ren1
->processed
= 1;
2645 ren1
->dst_entry
->processed
= 1;
2646 /* BUG: We should only mark src_entry as processed if we
2647 * are not dealing with a rename + add-source case.
2649 ren1
->src_entry
->processed
= 1;
2651 ren1_src
= ren1
->pair
->one
->path
;
2652 ren1_dst
= ren1
->pair
->two
->path
;
2655 /* One file renamed on both sides */
2656 const char *ren2_src
= ren2
->pair
->one
->path
;
2657 const char *ren2_dst
= ren2
->pair
->two
->path
;
2658 enum rename_type rename_type
;
2659 if (strcmp(ren1_src
, ren2_src
) != 0)
2660 BUG("ren1_src != ren2_src");
2661 ren2
->dst_entry
->processed
= 1;
2662 ren2
->processed
= 1;
2663 if (strcmp(ren1_dst
, ren2_dst
) != 0) {
2664 rename_type
= RENAME_ONE_FILE_TO_TWO
;
2667 rename_type
= RENAME_ONE_FILE_TO_ONE
;
2668 /* BUG: We should only remove ren1_src in
2669 * the base stage (think of rename +
2670 * add-source cases).
2672 remove_file(opt
, 1, ren1_src
, 1);
2673 update_entry(ren1
->dst_entry
,
2678 setup_rename_conflict_info(rename_type
, opt
, ren1
, ren2
);
2679 } else if ((lookup
= string_list_lookup(renames2Dst
, ren1_dst
))) {
2680 /* Two different files renamed to the same thing */
2682 ren2
= lookup
->util
;
2683 ren2_dst
= ren2
->pair
->two
->path
;
2684 if (strcmp(ren1_dst
, ren2_dst
) != 0)
2685 BUG("ren1_dst != ren2_dst");
2688 ren2
->processed
= 1;
2690 * BUG: We should only mark src_entry as processed
2691 * if we are not dealing with a rename + add-source
2694 ren2
->src_entry
->processed
= 1;
2696 setup_rename_conflict_info(RENAME_TWO_FILES_TO_ONE
,
2699 /* Renamed in 1, maybe changed in 2 */
2700 /* we only use sha1 and mode of these */
2701 struct diff_filespec src_other
, dst_other
;
2705 * unpack_trees loads entries from common-commit
2706 * into stage 1, from head-commit into stage 2, and
2707 * from merge-commit into stage 3. We keep track
2708 * of which side corresponds to the rename.
2710 int renamed_stage
= a_renames
== renames1
? 2 : 3;
2711 int other_stage
= a_renames
== renames1
? 3 : 2;
2713 /* BUG: We should only remove ren1_src in the base
2714 * stage and in other_stage (think of rename +
2717 remove_file(opt
, 1, ren1_src
,
2718 renamed_stage
== 2 || !was_tracked(opt
, ren1_src
));
2720 oidcpy(&src_other
.oid
,
2721 &ren1
->src_entry
->stages
[other_stage
].oid
);
2722 src_other
.mode
= ren1
->src_entry
->stages
[other_stage
].mode
;
2723 oidcpy(&dst_other
.oid
,
2724 &ren1
->dst_entry
->stages
[other_stage
].oid
);
2725 dst_other
.mode
= ren1
->dst_entry
->stages
[other_stage
].mode
;
2728 if (oid_eq(&src_other
.oid
, &null_oid
) &&
2729 ren1
->dir_rename_original_type
== 'A') {
2730 setup_rename_conflict_info(RENAME_VIA_DIR
,
2732 } else if (oid_eq(&src_other
.oid
, &null_oid
)) {
2733 setup_rename_conflict_info(RENAME_DELETE
,
2735 } else if ((dst_other
.mode
== ren1
->pair
->two
->mode
) &&
2736 oid_eq(&dst_other
.oid
, &ren1
->pair
->two
->oid
)) {
2738 * Added file on the other side identical to
2739 * the file being renamed: clean merge.
2740 * Also, there is no need to overwrite the
2741 * file already in the working copy, so call
2742 * update_file_flags() instead of
2745 if (update_file_flags(opt
,
2748 1, /* update_cache */
2751 } else if (!oid_eq(&dst_other
.oid
, &null_oid
)) {
2753 * Probably not a clean merge, but it's
2754 * premature to set clean_merge to 0 here,
2755 * because if the rename merges cleanly and
2756 * the merge exactly matches the newly added
2757 * file, then the merge will be clean.
2759 setup_rename_conflict_info(RENAME_ADD
,
2764 if (clean_merge
< 0)
2765 goto cleanup_and_return
;
2767 struct diff_filespec
*o
, *a
, *b
;
2768 src_other
.path
= (char *)ren1_src
;
2770 o
= ren1
->pair
->one
;
2771 if (a_renames
== renames1
) {
2772 a
= ren1
->pair
->two
;
2775 b
= ren1
->pair
->two
;
2778 update_entry(ren1
->dst_entry
, o
, a
, b
);
2779 setup_rename_conflict_info(RENAME_NORMAL
,
2785 string_list_clear(&a_by_dst
, 0);
2786 string_list_clear(&b_by_dst
, 0);
2791 struct rename_info
{
2792 struct string_list
*head_renames
;
2793 struct string_list
*merge_renames
;
2796 static void initial_cleanup_rename(struct diff_queue_struct
*pairs
,
2797 struct hashmap
*dir_renames
)
2799 struct hashmap_iter iter
;
2800 struct dir_rename_entry
*e
;
2802 hashmap_iter_init(dir_renames
, &iter
);
2803 while ((e
= hashmap_iter_next(&iter
))) {
2805 strbuf_release(&e
->new_dir
);
2806 /* possible_new_dirs already cleared in get_directory_renames */
2808 hashmap_free(dir_renames
, 1);
2815 static int detect_and_process_renames(struct merge_options
*opt
,
2816 struct tree
*common
,
2819 struct string_list
*entries
,
2820 struct rename_info
*ri
)
2822 struct diff_queue_struct
*head_pairs
, *merge_pairs
;
2823 struct hashmap
*dir_re_head
, *dir_re_merge
;
2826 ri
->head_renames
= NULL
;
2827 ri
->merge_renames
= NULL
;
2829 if (!merge_detect_rename(opt
))
2832 head_pairs
= get_diffpairs(opt
, common
, head
);
2833 merge_pairs
= get_diffpairs(opt
, common
, merge
);
2835 if ((opt
->detect_directory_renames
== MERGE_DIRECTORY_RENAMES_TRUE
) ||
2836 (opt
->detect_directory_renames
== MERGE_DIRECTORY_RENAMES_CONFLICT
&&
2837 !opt
->call_depth
)) {
2838 dir_re_head
= get_directory_renames(head_pairs
);
2839 dir_re_merge
= get_directory_renames(merge_pairs
);
2841 handle_directory_level_conflicts(opt
,
2843 dir_re_merge
, merge
);
2845 dir_re_head
= xmalloc(sizeof(*dir_re_head
));
2846 dir_re_merge
= xmalloc(sizeof(*dir_re_merge
));
2847 dir_rename_init(dir_re_head
);
2848 dir_rename_init(dir_re_merge
);
2851 ri
->head_renames
= get_renames(opt
, opt
->branch1
, head_pairs
,
2852 dir_re_merge
, dir_re_head
, head
,
2853 common
, head
, merge
, entries
,
2857 ri
->merge_renames
= get_renames(opt
, opt
->branch2
, merge_pairs
,
2858 dir_re_head
, dir_re_merge
, merge
,
2859 common
, head
, merge
, entries
,
2863 clean
&= process_renames(opt
, ri
->head_renames
, ri
->merge_renames
);
2867 * Some cleanup is deferred until cleanup_renames() because the
2868 * data structures are still needed and referenced in
2869 * process_entry(). But there are a few things we can free now.
2871 initial_cleanup_rename(head_pairs
, dir_re_head
);
2872 initial_cleanup_rename(merge_pairs
, dir_re_merge
);
2877 static void final_cleanup_rename(struct string_list
*rename
)
2879 const struct rename
*re
;
2885 for (i
= 0; i
< rename
->nr
; i
++) {
2886 re
= rename
->items
[i
].util
;
2887 diff_free_filepair(re
->pair
);
2889 string_list_clear(rename
, 1);
2893 static void final_cleanup_renames(struct rename_info
*re_info
)
2895 final_cleanup_rename(re_info
->head_renames
);
2896 final_cleanup_rename(re_info
->merge_renames
);
2899 static int read_oid_strbuf(struct merge_options
*opt
,
2900 const struct object_id
*oid
,
2904 enum object_type type
;
2906 buf
= read_object_file(oid
, &type
, &size
);
2908 return err(opt
, _("cannot read object %s"), oid_to_hex(oid
));
2909 if (type
!= OBJ_BLOB
) {
2911 return err(opt
, _("object %s is not a blob"), oid_to_hex(oid
));
2913 strbuf_attach(dst
, buf
, size
, size
+ 1);
2917 static int blob_unchanged(struct merge_options
*opt
,
2918 const struct diff_filespec
*o
,
2919 const struct diff_filespec
*a
,
2920 int renormalize
, const char *path
)
2922 struct strbuf obuf
= STRBUF_INIT
;
2923 struct strbuf abuf
= STRBUF_INIT
;
2924 int ret
= 0; /* assume changed for safety */
2925 const struct index_state
*idx
= opt
->repo
->index
;
2927 if (a
->mode
!= o
->mode
)
2929 if (oid_eq(&o
->oid
, &a
->oid
))
2934 if (read_oid_strbuf(opt
, &o
->oid
, &obuf
) ||
2935 read_oid_strbuf(opt
, &a
->oid
, &abuf
))
2938 * Note: binary | is used so that both renormalizations are
2939 * performed. Comparison can be skipped if both files are
2940 * unchanged since their sha1s have already been compared.
2942 if (renormalize_buffer(idx
, path
, obuf
.buf
, obuf
.len
, &obuf
) |
2943 renormalize_buffer(idx
, path
, abuf
.buf
, abuf
.len
, &abuf
))
2944 ret
= (obuf
.len
== abuf
.len
&& !memcmp(obuf
.buf
, abuf
.buf
, obuf
.len
));
2947 strbuf_release(&obuf
);
2948 strbuf_release(&abuf
);
2952 static int handle_modify_delete(struct merge_options
*opt
,
2954 const struct diff_filespec
*o
,
2955 const struct diff_filespec
*a
,
2956 const struct diff_filespec
*b
)
2958 const char *modify_branch
, *delete_branch
;
2959 const struct diff_filespec
*changed
;
2962 modify_branch
= opt
->branch1
;
2963 delete_branch
= opt
->branch2
;
2966 modify_branch
= opt
->branch2
;
2967 delete_branch
= opt
->branch1
;
2971 return handle_change_delete(opt
,
2974 modify_branch
, delete_branch
,
2975 _("modify"), _("modified"));
2978 static int handle_content_merge(struct merge_file_info
*mfi
,
2979 struct merge_options
*opt
,
2982 const struct diff_filespec
*o
,
2983 const struct diff_filespec
*a
,
2984 const struct diff_filespec
*b
,
2985 struct rename_conflict_info
*ci
)
2987 const char *reason
= _("content");
2988 unsigned df_conflict_remains
= 0;
2991 reason
= _("add/add");
2993 assert(o
->path
&& a
->path
&& b
->path
);
2994 if (ci
&& dir_in_way(opt
->repo
->index
, path
, !opt
->call_depth
,
2995 S_ISGITLINK(ci
->ren1
->pair
->two
->mode
)))
2996 df_conflict_remains
= 1;
2998 if (merge_mode_and_contents(opt
, o
, a
, b
, path
,
2999 opt
->branch1
, opt
->branch2
,
3000 opt
->call_depth
* 2, mfi
))
3004 * We can skip updating the working tree file iff:
3005 * a) The merge is clean
3006 * b) The merge matches what was in HEAD (content, mode, pathname)
3007 * c) The target path is usable (i.e. not involved in D/F conflict)
3009 if (mfi
->clean
&& was_tracked_and_matches(opt
, path
, &mfi
->blob
) &&
3010 !df_conflict_remains
) {
3012 struct cache_entry
*ce
;
3014 output(opt
, 3, _("Skipped %s (merged same as existing)"), path
);
3015 if (add_cacheinfo(opt
, &mfi
->blob
, path
,
3016 0, (!opt
->call_depth
&& !is_dirty
), 0))
3019 * However, add_cacheinfo() will delete the old cache entry
3020 * and add a new one. We need to copy over any skip_worktree
3021 * flag to avoid making the file appear as if it were
3022 * deleted by the user.
3024 pos
= index_name_pos(&opt
->orig_index
, path
, strlen(path
));
3025 ce
= opt
->orig_index
.cache
[pos
];
3026 if (ce_skip_worktree(ce
)) {
3027 pos
= index_name_pos(opt
->repo
->index
, path
, strlen(path
));
3028 ce
= opt
->repo
->index
->cache
[pos
];
3029 ce
->ce_flags
|= CE_SKIP_WORKTREE
;
3035 if (S_ISGITLINK(mfi
->blob
.mode
))
3036 reason
= _("submodule");
3037 output(opt
, 1, _("CONFLICT (%s): Merge conflict in %s"),
3039 if (ci
&& !df_conflict_remains
)
3040 if (update_stages(opt
, path
, o
, a
, b
))
3044 if (df_conflict_remains
|| is_dirty
) {
3046 if (opt
->call_depth
) {
3047 remove_file_from_index(opt
->repo
->index
, path
);
3050 if (update_stages(opt
, path
, o
, a
, b
))
3053 int file_from_stage2
= was_tracked(opt
, path
);
3055 if (update_stages(opt
, path
, NULL
,
3056 file_from_stage2
? &mfi
->blob
: NULL
,
3057 file_from_stage2
? NULL
: &mfi
->blob
))
3062 new_path
= unique_path(opt
, path
, ci
->ren1
->branch
);
3064 output(opt
, 1, _("Refusing to lose dirty file at %s"),
3067 output(opt
, 1, _("Adding as %s instead"), new_path
);
3068 if (update_file(opt
, 0, &mfi
->blob
, new_path
)) {
3074 } else if (update_file(opt
, mfi
->clean
, &mfi
->blob
, path
))
3076 return !is_dirty
&& mfi
->clean
;
3079 static int handle_rename_normal(struct merge_options
*opt
,
3081 const struct diff_filespec
*o
,
3082 const struct diff_filespec
*a
,
3083 const struct diff_filespec
*b
,
3084 struct rename_conflict_info
*ci
)
3086 struct rename
*ren
= ci
->ren1
;
3087 struct merge_file_info mfi
;
3089 int side
= (ren
->branch
== opt
->branch1
? 2 : 3);
3091 /* Merge the content and write it out */
3092 clean
= handle_content_merge(&mfi
, opt
, path
, was_dirty(opt
, path
),
3096 opt
->detect_directory_renames
== MERGE_DIRECTORY_RENAMES_CONFLICT
&&
3097 ren
->dir_rename_original_dest
) {
3098 if (update_stages(opt
, path
,
3100 side
== 2 ? &mfi
.blob
: NULL
,
3101 side
== 2 ? NULL
: &mfi
.blob
))
3103 clean
= 0; /* not clean, but conflicted */
3108 static void dir_rename_warning(const char *msg
,
3111 struct merge_options
*opt
,
3114 const char *other_branch
;
3115 other_branch
= (ren
->branch
== opt
->branch1
?
3116 opt
->branch2
: opt
->branch1
);
3118 output(opt
, clean
? 2 : 1, msg
,
3119 ren
->pair
->one
->path
, ren
->branch
,
3120 other_branch
, ren
->pair
->two
->path
);
3123 output(opt
, clean
? 2 : 1, msg
,
3124 ren
->pair
->one
->path
, ren
->dir_rename_original_dest
, ren
->branch
,
3125 other_branch
, ren
->pair
->two
->path
);
3127 static int warn_about_dir_renamed_entries(struct merge_options
*opt
,
3131 int clean
= 1, is_add
;
3136 /* Return early if ren was not affected/created by a directory rename */
3137 if (!ren
->dir_rename_original_dest
)
3141 assert(opt
->detect_directory_renames
> MERGE_DIRECTORY_RENAMES_NONE
);
3142 assert(ren
->dir_rename_original_type
== 'A' ||
3143 ren
->dir_rename_original_type
== 'R');
3145 /* Check whether to treat directory renames as a conflict */
3146 clean
= (opt
->detect_directory_renames
== MERGE_DIRECTORY_RENAMES_TRUE
);
3148 is_add
= (ren
->dir_rename_original_type
== 'A');
3149 if (ren
->dir_rename_original_type
== 'A' && clean
) {
3150 msg
= _("Path updated: %s added in %s inside a "
3151 "directory that was renamed in %s; moving it to %s.");
3152 } else if (ren
->dir_rename_original_type
== 'A' && !clean
) {
3153 msg
= _("CONFLICT (file location): %s added in %s "
3154 "inside a directory that was renamed in %s, "
3155 "suggesting it should perhaps be moved to %s.");
3156 } else if (ren
->dir_rename_original_type
== 'R' && clean
) {
3157 msg
= _("Path updated: %s renamed to %s in %s, inside a "
3158 "directory that was renamed in %s; moving it to %s.");
3159 } else if (ren
->dir_rename_original_type
== 'R' && !clean
) {
3160 msg
= _("CONFLICT (file location): %s renamed to %s in %s, "
3161 "inside a directory that was renamed in %s, "
3162 "suggesting it should perhaps be moved to %s.");
3164 BUG("Impossible dir_rename_original_type/clean combination");
3166 dir_rename_warning(msg
, is_add
, clean
, opt
, ren
);
3171 /* Per entry merge function */
3172 static int process_entry(struct merge_options
*opt
,
3173 const char *path
, struct stage_data
*entry
)
3175 int clean_merge
= 1;
3176 int normalize
= opt
->renormalize
;
3178 struct diff_filespec
*o
= &entry
->stages
[1];
3179 struct diff_filespec
*a
= &entry
->stages
[2];
3180 struct diff_filespec
*b
= &entry
->stages
[3];
3181 int o_valid
= is_valid(o
);
3182 int a_valid
= is_valid(a
);
3183 int b_valid
= is_valid(b
);
3184 o
->path
= a
->path
= b
->path
= (char*)path
;
3186 entry
->processed
= 1;
3187 if (entry
->rename_conflict_info
) {
3188 struct rename_conflict_info
*ci
= entry
->rename_conflict_info
;
3189 struct diff_filespec
*temp
;
3192 path_clean
= warn_about_dir_renamed_entries(opt
, ci
->ren1
);
3193 path_clean
&= warn_about_dir_renamed_entries(opt
, ci
->ren2
);
3196 * For cases with a single rename, {o,a,b}->path have all been
3197 * set to the rename target path; we need to set two of these
3198 * back to the rename source.
3199 * For rename/rename conflicts, we'll manually fix paths below.
3201 temp
= (opt
->branch1
== ci
->ren1
->branch
) ? b
: a
;
3202 o
->path
= temp
->path
= ci
->ren1
->pair
->one
->path
;
3204 assert(opt
->branch1
== ci
->ren1
->branch
);
3207 switch (ci
->rename_type
) {
3209 case RENAME_ONE_FILE_TO_ONE
:
3210 clean_merge
= handle_rename_normal(opt
, path
, o
, a
, b
,
3213 case RENAME_VIA_DIR
:
3214 clean_merge
= handle_rename_via_dir(opt
, ci
);
3218 * Probably unclean merge, but if the renamed file
3219 * merges cleanly and the result can then be
3220 * two-way merged cleanly with the added file, I
3221 * guess it's a clean merge?
3223 clean_merge
= handle_rename_add(opt
, ci
);
3227 if (handle_rename_delete(opt
, ci
))
3230 case RENAME_ONE_FILE_TO_TWO
:
3232 * Manually fix up paths; note:
3233 * ren[12]->pair->one->path are equal.
3235 o
->path
= ci
->ren1
->pair
->one
->path
;
3236 a
->path
= ci
->ren1
->pair
->two
->path
;
3237 b
->path
= ci
->ren2
->pair
->two
->path
;
3240 if (handle_rename_rename_1to2(opt
, ci
))
3243 case RENAME_TWO_FILES_TO_ONE
:
3245 * Manually fix up paths; note,
3246 * ren[12]->pair->two->path are actually equal.
3249 a
->path
= ci
->ren1
->pair
->two
->path
;
3250 b
->path
= ci
->ren2
->pair
->two
->path
;
3253 * Probably unclean merge, but if the two renamed
3254 * files merge cleanly and the two resulting files
3255 * can then be two-way merged cleanly, I guess it's
3258 clean_merge
= handle_rename_rename_2to1(opt
, ci
);
3261 entry
->processed
= 0;
3264 if (path_clean
< clean_merge
)
3265 clean_merge
= path_clean
;
3266 } else if (o_valid
&& (!a_valid
|| !b_valid
)) {
3267 /* Case A: Deleted in one */
3268 if ((!a_valid
&& !b_valid
) ||
3269 (!b_valid
&& blob_unchanged(opt
, o
, a
, normalize
, path
)) ||
3270 (!a_valid
&& blob_unchanged(opt
, o
, b
, normalize
, path
))) {
3271 /* Deleted in both or deleted in one and
3272 * unchanged in the other */
3274 output(opt
, 2, _("Removing %s"), path
);
3275 /* do not touch working file if it did not exist */
3276 remove_file(opt
, 1, path
, !a_valid
);
3278 /* Modify/delete; deleted side may have put a directory in the way */
3280 if (handle_modify_delete(opt
, path
, o
, a
, b
))
3283 } else if ((!o_valid
&& a_valid
&& !b_valid
) ||
3284 (!o_valid
&& !a_valid
&& b_valid
)) {
3285 /* Case B: Added in one. */
3286 /* [nothing|directory] -> ([nothing|directory], file) */
3288 const char *add_branch
;
3289 const char *other_branch
;
3291 const struct diff_filespec
*contents
;
3294 add_branch
= opt
->branch1
;
3295 other_branch
= opt
->branch2
;
3297 conf
= _("file/directory");
3299 add_branch
= opt
->branch2
;
3300 other_branch
= opt
->branch1
;
3302 conf
= _("directory/file");
3304 if (dir_in_way(opt
->repo
->index
, path
,
3305 !opt
->call_depth
&& !S_ISGITLINK(a
->mode
),
3307 char *new_path
= unique_path(opt
, path
, add_branch
);
3309 output(opt
, 1, _("CONFLICT (%s): There is a directory with name %s in %s. "
3311 conf
, path
, other_branch
, path
, new_path
);
3312 if (update_file(opt
, 0, contents
, new_path
))
3314 else if (opt
->call_depth
)
3315 remove_file_from_index(opt
->repo
->index
, path
);
3318 output(opt
, 2, _("Adding %s"), path
);
3319 /* do not overwrite file if already present */
3320 if (update_file_flags(opt
, contents
, path
, 1, !a_valid
))
3323 } else if (a_valid
&& b_valid
) {
3325 /* Case C: Added in both (check for same permissions) */
3327 _("CONFLICT (add/add): Merge conflict in %s"),
3329 clean_merge
= handle_file_collision(opt
,
3335 /* case D: Modified in both, but differently. */
3336 struct merge_file_info mfi
;
3337 int is_dirty
= 0; /* unpack_trees would have bailed if dirty */
3338 clean_merge
= handle_content_merge(&mfi
, opt
, path
,
3342 } else if (!o_valid
&& !a_valid
&& !b_valid
) {
3344 * this entry was deleted altogether. a_mode == 0 means
3345 * we had that path and want to actively remove it.
3347 remove_file(opt
, 1, path
, !a
->mode
);
3349 BUG("fatal merge failure, shouldn't happen.");
3354 static int merge_trees_internal(struct merge_options
*opt
,
3357 struct tree
*common
,
3358 struct tree
**result
)
3360 struct index_state
*istate
= opt
->repo
->index
;
3363 if (opt
->subtree_shift
) {
3364 merge
= shift_tree_object(opt
->repo
, head
, merge
, opt
->subtree_shift
);
3365 common
= shift_tree_object(opt
->repo
, head
, common
, opt
->subtree_shift
);
3368 if (oid_eq(&common
->object
.oid
, &merge
->object
.oid
)) {
3369 output(opt
, 0, _("Already up to date!"));
3374 code
= unpack_trees_start(opt
, common
, head
, merge
);
3377 if (show(opt
, 4) || opt
->call_depth
)
3378 err(opt
, _("merging of trees %s and %s failed"),
3379 oid_to_hex(&head
->object
.oid
),
3380 oid_to_hex(&merge
->object
.oid
));
3381 unpack_trees_finish(opt
);
3385 if (unmerged_index(istate
)) {
3386 struct string_list
*entries
;
3387 struct rename_info re_info
;
3390 * Only need the hashmap while processing entries, so
3391 * initialize it here and free it when we are done running
3392 * through the entries. Keeping it in the merge_options as
3393 * opposed to decaring a local hashmap is for convenience
3394 * so that we don't have to pass it to around.
3396 hashmap_init(&opt
->current_file_dir_set
, path_hashmap_cmp
, NULL
, 512);
3397 get_files_dirs(opt
, head
);
3398 get_files_dirs(opt
, merge
);
3400 entries
= get_unmerged(opt
->repo
->index
);
3401 clean
= detect_and_process_renames(opt
, common
, head
, merge
,
3403 record_df_conflict_files(opt
, entries
);
3406 for (i
= entries
->nr
-1; 0 <= i
; i
--) {
3407 const char *path
= entries
->items
[i
].string
;
3408 struct stage_data
*e
= entries
->items
[i
].util
;
3409 if (!e
->processed
) {
3410 int ret
= process_entry(opt
, path
, e
);
3419 for (i
= 0; i
< entries
->nr
; i
++) {
3420 struct stage_data
*e
= entries
->items
[i
].util
;
3422 BUG("unprocessed path??? %s",
3423 entries
->items
[i
].string
);
3427 final_cleanup_renames(&re_info
);
3429 string_list_clear(entries
, 1);
3432 hashmap_free(&opt
->current_file_dir_set
, 1);
3435 unpack_trees_finish(opt
);
3442 unpack_trees_finish(opt
);
3444 if (opt
->call_depth
&&
3445 !(*result
= write_in_core_index_as_tree(opt
->repo
)))
3451 static struct commit_list
*reverse_commit_list(struct commit_list
*list
)
3453 struct commit_list
*next
= NULL
, *current
, *backup
;
3454 for (current
= list
; current
; current
= backup
) {
3455 backup
= current
->next
;
3456 current
->next
= next
;
3463 * Merge the commits h1 and h2, return the resulting virtual
3464 * commit object and a flag indicating the cleanness of the merge.
3466 static int merge_recursive_internal(struct merge_options
*opt
,
3469 struct commit_list
*ca
,
3470 struct commit
**result
)
3472 struct commit_list
*iter
;
3473 struct commit
*merged_common_ancestors
;
3474 struct tree
*mrtree
;
3476 const char *ancestor_name
;
3477 struct strbuf merge_base_abbrev
= STRBUF_INIT
;
3480 output(opt
, 4, _("Merging:"));
3481 output_commit_title(opt
, h1
);
3482 output_commit_title(opt
, h2
);
3486 ca
= get_merge_bases(h1
, h2
);
3487 ca
= reverse_commit_list(ca
);
3491 unsigned cnt
= commit_list_count(ca
);
3493 output(opt
, 5, Q_("found %u common ancestor:",
3494 "found %u common ancestors:", cnt
), cnt
);
3495 for (iter
= ca
; iter
; iter
= iter
->next
)
3496 output_commit_title(opt
, iter
->item
);
3499 merged_common_ancestors
= pop_commit(&ca
);
3500 if (merged_common_ancestors
== NULL
) {
3501 /* if there is no common ancestor, use an empty tree */
3504 tree
= lookup_tree(opt
->repo
, opt
->repo
->hash_algo
->empty_tree
);
3505 merged_common_ancestors
= make_virtual_commit(opt
->repo
, tree
, "ancestor");
3506 ancestor_name
= "empty tree";
3508 ancestor_name
= "merged common ancestors";
3510 strbuf_add_unique_abbrev(&merge_base_abbrev
,
3511 &merged_common_ancestors
->object
.oid
,
3513 ancestor_name
= merge_base_abbrev
.buf
;
3516 for (iter
= ca
; iter
; iter
= iter
->next
) {
3517 const char *saved_b1
, *saved_b2
;
3520 * When the merge fails, the result contains files
3521 * with conflict markers. The cleanness flag is
3522 * ignored (unless indicating an error), it was never
3523 * actually used, as result of merge_trees has always
3524 * overwritten it: the committed "conflicts" were
3527 discard_index(opt
->repo
->index
);
3528 saved_b1
= opt
->branch1
;
3529 saved_b2
= opt
->branch2
;
3530 opt
->branch1
= "Temporary merge branch 1";
3531 opt
->branch2
= "Temporary merge branch 2";
3532 if (merge_recursive_internal(opt
, merged_common_ancestors
, iter
->item
,
3533 NULL
, &merged_common_ancestors
) < 0)
3535 opt
->branch1
= saved_b1
;
3536 opt
->branch2
= saved_b2
;
3539 if (!merged_common_ancestors
)
3540 return err(opt
, _("merge returned no commit"));
3543 discard_index(opt
->repo
->index
);
3544 if (!opt
->call_depth
)
3545 repo_read_index(opt
->repo
);
3547 opt
->ancestor
= ancestor_name
;
3548 clean
= merge_trees_internal(opt
,
3549 repo_get_commit_tree(opt
->repo
, h1
),
3550 repo_get_commit_tree(opt
->repo
, h2
),
3551 repo_get_commit_tree(opt
->repo
,
3552 merged_common_ancestors
),
3554 strbuf_release(&merge_base_abbrev
);
3560 if (opt
->call_depth
) {
3561 *result
= make_virtual_commit(opt
->repo
, mrtree
, "merged tree");
3562 commit_list_insert(h1
, &(*result
)->parents
);
3563 commit_list_insert(h2
, &(*result
)->parents
->next
);
3566 if (!opt
->call_depth
&& opt
->buffer_output
< 2)
3567 strbuf_release(&opt
->obuf
);
3571 static int merge_start(struct merge_options
*opt
, struct tree
*head
)
3573 struct strbuf sb
= STRBUF_INIT
;
3575 if (repo_index_has_changes(opt
->repo
, head
, &sb
)) {
3576 err(opt
, _("Your local changes to the following files would be overwritten by merge:\n %s"),
3578 strbuf_release(&sb
);
3585 static void merge_finalize(struct merge_options
*opt
)
3588 diff_warn_rename_limit("merge.renamelimit",
3589 opt
->needed_rename_limit
, 0);
3592 int merge_trees(struct merge_options
*opt
,
3595 struct tree
*common
)
3598 struct tree
*ignored
;
3600 assert(opt
->ancestor
!= NULL
);
3602 if (merge_start(opt
, head
))
3604 clean
= merge_trees_internal(opt
, head
, merge
, common
, &ignored
);
3605 merge_finalize(opt
);
3610 int merge_recursive(struct merge_options
*opt
,
3613 struct commit_list
*ca
,
3614 struct commit
**result
)
3618 assert(opt
->ancestor
== NULL
);
3620 if (merge_start(opt
, repo_get_commit_tree(opt
->repo
, h1
)))
3622 clean
= merge_recursive_internal(opt
, h1
, h2
, ca
, result
);
3623 merge_finalize(opt
);
3628 static struct commit
*get_ref(struct repository
*repo
, const struct object_id
*oid
,
3631 struct object
*object
;
3633 object
= deref_tag(repo
, parse_object(repo
, oid
),
3634 name
, strlen(name
));
3637 if (object
->type
== OBJ_TREE
)
3638 return make_virtual_commit(repo
, (struct tree
*)object
, name
);
3639 if (object
->type
!= OBJ_COMMIT
)
3641 if (parse_commit((struct commit
*)object
))
3643 return (struct commit
*)object
;
3646 int merge_recursive_generic(struct merge_options
*opt
,
3647 const struct object_id
*head
,
3648 const struct object_id
*merge
,
3650 const struct object_id
**base_list
,
3651 struct commit
**result
)
3654 struct lock_file lock
= LOCK_INIT
;
3655 struct commit
*head_commit
= get_ref(opt
->repo
, head
, opt
->branch1
);
3656 struct commit
*next_commit
= get_ref(opt
->repo
, merge
, opt
->branch2
);
3657 struct commit_list
*ca
= NULL
;
3661 for (i
= 0; i
< num_base_list
; ++i
) {
3662 struct commit
*base
;
3663 if (!(base
= get_ref(opt
->repo
, base_list
[i
], oid_to_hex(base_list
[i
]))))
3664 return err(opt
, _("Could not parse object '%s'"),
3665 oid_to_hex(base_list
[i
]));
3666 commit_list_insert(base
, &ca
);
3670 repo_hold_locked_index(opt
->repo
, &lock
, LOCK_DIE_ON_ERROR
);
3671 clean
= merge_recursive(opt
, head_commit
, next_commit
, ca
,
3674 rollback_lock_file(&lock
);
3678 if (write_locked_index(opt
->repo
->index
, &lock
,
3679 COMMIT_LOCK
| SKIP_IF_UNCHANGED
))
3680 return err(opt
, _("Unable to write index."));
3682 return clean
? 0 : 1;
3685 static void merge_recursive_config(struct merge_options
*opt
)
3688 git_config_get_int("merge.verbosity", &opt
->verbosity
);
3689 git_config_get_int("diff.renamelimit", &opt
->diff_rename_limit
);
3690 git_config_get_int("merge.renamelimit", &opt
->merge_rename_limit
);
3691 if (!git_config_get_string("diff.renames", &value
)) {
3692 opt
->diff_detect_rename
= git_config_rename("diff.renames", value
);
3695 if (!git_config_get_string("merge.renames", &value
)) {
3696 opt
->merge_detect_rename
= git_config_rename("merge.renames", value
);
3699 if (!git_config_get_string("merge.directoryrenames", &value
)) {
3700 int boolval
= git_parse_maybe_bool(value
);
3702 opt
->detect_directory_renames
= boolval
?
3703 MERGE_DIRECTORY_RENAMES_TRUE
:
3704 MERGE_DIRECTORY_RENAMES_NONE
;
3705 } else if (!strcasecmp(value
, "conflict")) {
3706 opt
->detect_directory_renames
=
3707 MERGE_DIRECTORY_RENAMES_CONFLICT
;
3708 } /* avoid erroring on values from future versions of git */
3711 git_config(git_xmerge_config
, NULL
);
3714 void init_merge_options(struct merge_options
*opt
,
3715 struct repository
*repo
)
3717 const char *merge_verbosity
;
3718 memset(opt
, 0, sizeof(struct merge_options
));
3721 opt
->buffer_output
= 1;
3722 opt
->diff_rename_limit
= -1;
3723 opt
->merge_rename_limit
= -1;
3724 opt
->renormalize
= 0;
3725 opt
->diff_detect_rename
= -1;
3726 opt
->merge_detect_rename
= -1;
3727 opt
->detect_directory_renames
= MERGE_DIRECTORY_RENAMES_CONFLICT
;
3728 merge_recursive_config(opt
);
3729 merge_verbosity
= getenv("GIT_MERGE_VERBOSITY");
3730 if (merge_verbosity
)
3731 opt
->verbosity
= strtol(merge_verbosity
, NULL
, 10);
3732 if (opt
->verbosity
>= 5)
3733 opt
->buffer_output
= 0;
3734 strbuf_init(&opt
->obuf
, 0);
3735 string_list_init(&opt
->df_conflict_file_set
, 1);
3738 int parse_merge_opt(struct merge_options
*opt
, const char *s
)
3744 if (!strcmp(s
, "ours"))
3745 opt
->recursive_variant
= MERGE_RECURSIVE_OURS
;
3746 else if (!strcmp(s
, "theirs"))
3747 opt
->recursive_variant
= MERGE_RECURSIVE_THEIRS
;
3748 else if (!strcmp(s
, "subtree"))
3749 opt
->subtree_shift
= "";
3750 else if (skip_prefix(s
, "subtree=", &arg
))
3751 opt
->subtree_shift
= arg
;
3752 else if (!strcmp(s
, "patience"))
3753 opt
->xdl_opts
= DIFF_WITH_ALG(opt
, PATIENCE_DIFF
);
3754 else if (!strcmp(s
, "histogram"))
3755 opt
->xdl_opts
= DIFF_WITH_ALG(opt
, HISTOGRAM_DIFF
);
3756 else if (skip_prefix(s
, "diff-algorithm=", &arg
)) {
3757 long value
= parse_algorithm_value(arg
);
3760 /* clear out previous settings */
3761 DIFF_XDL_CLR(opt
, NEED_MINIMAL
);
3762 opt
->xdl_opts
&= ~XDF_DIFF_ALGORITHM_MASK
;
3763 opt
->xdl_opts
|= value
;
3765 else if (!strcmp(s
, "ignore-space-change"))
3766 DIFF_XDL_SET(opt
, IGNORE_WHITESPACE_CHANGE
);
3767 else if (!strcmp(s
, "ignore-all-space"))
3768 DIFF_XDL_SET(opt
, IGNORE_WHITESPACE
);
3769 else if (!strcmp(s
, "ignore-space-at-eol"))
3770 DIFF_XDL_SET(opt
, IGNORE_WHITESPACE_AT_EOL
);
3771 else if (!strcmp(s
, "ignore-cr-at-eol"))
3772 DIFF_XDL_SET(opt
, IGNORE_CR_AT_EOL
);
3773 else if (!strcmp(s
, "renormalize"))
3774 opt
->renormalize
= 1;
3775 else if (!strcmp(s
, "no-renormalize"))
3776 opt
->renormalize
= 0;
3777 else if (!strcmp(s
, "no-renames"))
3778 opt
->merge_detect_rename
= 0;
3779 else if (!strcmp(s
, "find-renames")) {
3780 opt
->merge_detect_rename
= 1;
3781 opt
->rename_score
= 0;
3783 else if (skip_prefix(s
, "find-renames=", &arg
) ||
3784 skip_prefix(s
, "rename-threshold=", &arg
)) {
3785 if ((opt
->rename_score
= parse_rename_score(&arg
)) == -1 || *arg
!= 0)
3787 opt
->merge_detect_rename
= 1;
3790 * Please update $__git_merge_strategy_options in
3791 * git-completion.bash when you add new options