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Commit | Line | Data |
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1c7b76be MV |
1 | /* |
2 | * Builtin "git merge" | |
3 | * | |
4 | * Copyright (c) 2008 Miklos Vajna <vmiklos@frugalware.org> | |
5 | * | |
6 | * Based on git-merge.sh by Junio C Hamano. | |
7 | */ | |
8 | ||
9 | #include "cache.h" | |
10 | #include "parse-options.h" | |
11 | #include "builtin.h" | |
12 | #include "run-command.h" | |
13 | #include "diff.h" | |
14 | #include "refs.h" | |
15 | #include "commit.h" | |
16 | #include "diffcore.h" | |
17 | #include "revision.h" | |
18 | #include "unpack-trees.h" | |
19 | #include "cache-tree.h" | |
20 | #include "dir.h" | |
21 | #include "utf8.h" | |
22 | #include "log-tree.h" | |
23 | #include "color.h" | |
fcab40a3 | 24 | #include "rerere.h" |
87091b49 | 25 | #include "help.h" |
18668f53 | 26 | #include "merge-recursive.h" |
1c7b76be MV |
27 | |
28 | #define DEFAULT_TWOHEAD (1<<0) | |
29 | #define DEFAULT_OCTOPUS (1<<1) | |
30 | #define NO_FAST_FORWARD (1<<2) | |
31 | #define NO_TRIVIAL (1<<3) | |
32 | ||
33 | struct strategy { | |
34 | const char *name; | |
35 | unsigned attr; | |
36 | }; | |
37 | ||
38 | static const char * const builtin_merge_usage[] = { | |
34263de0 AP |
39 | "git merge [options] <remote>...", |
40 | "git merge [options] <msg> HEAD <remote>", | |
1c7b76be MV |
41 | NULL |
42 | }; | |
43 | ||
44 | static int show_diffstat = 1, option_log, squash; | |
45 | static int option_commit = 1, allow_fast_forward = 1; | |
46 | static int allow_trivial = 1, have_message; | |
47 | static struct strbuf merge_msg; | |
48 | static struct commit_list *remoteheads; | |
49 | static unsigned char head[20], stash[20]; | |
50 | static struct strategy **use_strategies; | |
51 | static size_t use_strategies_nr, use_strategies_alloc; | |
52 | static const char *branch; | |
7f87aff2 | 53 | static int verbosity; |
1c7b76be MV |
54 | |
55 | static struct strategy all_strategy[] = { | |
1c7b76be MV |
56 | { "recursive", DEFAULT_TWOHEAD | NO_TRIVIAL }, |
57 | { "octopus", DEFAULT_OCTOPUS }, | |
58 | { "resolve", 0 }, | |
1c7b76be MV |
59 | { "ours", NO_FAST_FORWARD | NO_TRIVIAL }, |
60 | { "subtree", NO_FAST_FORWARD | NO_TRIVIAL }, | |
61 | }; | |
62 | ||
63 | static const char *pull_twohead, *pull_octopus; | |
64 | ||
65 | static int option_parse_message(const struct option *opt, | |
66 | const char *arg, int unset) | |
67 | { | |
68 | struct strbuf *buf = opt->value; | |
69 | ||
70 | if (unset) | |
71 | strbuf_setlen(buf, 0); | |
74f5b7fb | 72 | else if (arg) { |
1c7b76be MV |
73 | strbuf_addf(buf, "%s\n\n", arg); |
74 | have_message = 1; | |
74f5b7fb MB |
75 | } else |
76 | return error("switch `m' requires a value"); | |
1c7b76be MV |
77 | return 0; |
78 | } | |
79 | ||
80 | static struct strategy *get_strategy(const char *name) | |
81 | { | |
82 | int i; | |
87091b49 MV |
83 | struct strategy *ret; |
84 | static struct cmdnames main_cmds, other_cmds; | |
e321180e | 85 | static int loaded; |
1c7b76be MV |
86 | |
87 | if (!name) | |
88 | return NULL; | |
89 | ||
90 | for (i = 0; i < ARRAY_SIZE(all_strategy); i++) | |
91 | if (!strcmp(name, all_strategy[i].name)) | |
92 | return &all_strategy[i]; | |
1719b5e4 | 93 | |
e321180e | 94 | if (!loaded) { |
87091b49 | 95 | struct cmdnames not_strategies; |
e321180e | 96 | loaded = 1; |
87091b49 | 97 | |
87091b49 | 98 | memset(¬_strategies, 0, sizeof(struct cmdnames)); |
e321180e | 99 | load_command_list("git-merge-", &main_cmds, &other_cmds); |
87091b49 MV |
100 | for (i = 0; i < main_cmds.cnt; i++) { |
101 | int j, found = 0; | |
102 | struct cmdname *ent = main_cmds.names[i]; | |
103 | for (j = 0; j < ARRAY_SIZE(all_strategy); j++) | |
104 | if (!strncmp(ent->name, all_strategy[j].name, ent->len) | |
105 | && !all_strategy[j].name[ent->len]) | |
106 | found = 1; | |
107 | if (!found) | |
108 | add_cmdname(¬_strategies, ent->name, ent->len); | |
109 | exclude_cmds(&main_cmds, ¬_strategies); | |
110 | } | |
111 | } | |
112 | if (!is_in_cmdlist(&main_cmds, name) && !is_in_cmdlist(&other_cmds, name)) { | |
131f9a10 JH |
113 | fprintf(stderr, "Could not find merge strategy '%s'.\n", name); |
114 | fprintf(stderr, "Available strategies are:"); | |
115 | for (i = 0; i < main_cmds.cnt; i++) | |
116 | fprintf(stderr, " %s", main_cmds.names[i]->name); | |
117 | fprintf(stderr, ".\n"); | |
118 | if (other_cmds.cnt) { | |
119 | fprintf(stderr, "Available custom strategies are:"); | |
120 | for (i = 0; i < other_cmds.cnt; i++) | |
121 | fprintf(stderr, " %s", other_cmds.names[i]->name); | |
122 | fprintf(stderr, ".\n"); | |
123 | } | |
87091b49 MV |
124 | exit(1); |
125 | } | |
126 | ||
19d4b416 | 127 | ret = xcalloc(1, sizeof(struct strategy)); |
87091b49 MV |
128 | ret->name = xstrdup(name); |
129 | return ret; | |
1c7b76be MV |
130 | } |
131 | ||
132 | static void append_strategy(struct strategy *s) | |
133 | { | |
134 | ALLOC_GROW(use_strategies, use_strategies_nr + 1, use_strategies_alloc); | |
135 | use_strategies[use_strategies_nr++] = s; | |
136 | } | |
137 | ||
138 | static int option_parse_strategy(const struct option *opt, | |
139 | const char *name, int unset) | |
140 | { | |
1c7b76be MV |
141 | if (unset) |
142 | return 0; | |
143 | ||
1719b5e4 | 144 | append_strategy(get_strategy(name)); |
1c7b76be MV |
145 | return 0; |
146 | } | |
147 | ||
148 | static int option_parse_n(const struct option *opt, | |
149 | const char *arg, int unset) | |
150 | { | |
151 | show_diffstat = unset; | |
152 | return 0; | |
153 | } | |
154 | ||
155 | static struct option builtin_merge_options[] = { | |
156 | { OPTION_CALLBACK, 'n', NULL, NULL, NULL, | |
157 | "do not show a diffstat at the end of the merge", | |
158 | PARSE_OPT_NOARG, option_parse_n }, | |
159 | OPT_BOOLEAN(0, "stat", &show_diffstat, | |
160 | "show a diffstat at the end of the merge"), | |
161 | OPT_BOOLEAN(0, "summary", &show_diffstat, "(synonym to --stat)"), | |
162 | OPT_BOOLEAN(0, "log", &option_log, | |
163 | "add list of one-line log to merge commit message"), | |
164 | OPT_BOOLEAN(0, "squash", &squash, | |
165 | "create a single commit instead of doing a merge"), | |
166 | OPT_BOOLEAN(0, "commit", &option_commit, | |
167 | "perform a commit if the merge succeeds (default)"), | |
168 | OPT_BOOLEAN(0, "ff", &allow_fast_forward, | |
169 | "allow fast forward (default)"), | |
170 | OPT_CALLBACK('s', "strategy", &use_strategies, "strategy", | |
171 | "merge strategy to use", option_parse_strategy), | |
172 | OPT_CALLBACK('m', "message", &merge_msg, "message", | |
173 | "message to be used for the merge commit (if any)", | |
174 | option_parse_message), | |
7f87aff2 | 175 | OPT__VERBOSITY(&verbosity), |
1c7b76be MV |
176 | OPT_END() |
177 | }; | |
178 | ||
179 | /* Cleans up metadata that is uninteresting after a succeeded merge. */ | |
180 | static void drop_save(void) | |
181 | { | |
182 | unlink(git_path("MERGE_HEAD")); | |
183 | unlink(git_path("MERGE_MSG")); | |
cf10f9fd | 184 | unlink(git_path("MERGE_MODE")); |
1c7b76be MV |
185 | } |
186 | ||
187 | static void save_state(void) | |
188 | { | |
189 | int len; | |
190 | struct child_process cp; | |
191 | struct strbuf buffer = STRBUF_INIT; | |
192 | const char *argv[] = {"stash", "create", NULL}; | |
193 | ||
194 | memset(&cp, 0, sizeof(cp)); | |
195 | cp.argv = argv; | |
196 | cp.out = -1; | |
197 | cp.git_cmd = 1; | |
198 | ||
199 | if (start_command(&cp)) | |
200 | die("could not run stash."); | |
201 | len = strbuf_read(&buffer, cp.out, 1024); | |
202 | close(cp.out); | |
203 | ||
204 | if (finish_command(&cp) || len < 0) | |
205 | die("stash failed"); | |
206 | else if (!len) | |
207 | return; | |
208 | strbuf_setlen(&buffer, buffer.len-1); | |
209 | if (get_sha1(buffer.buf, stash)) | |
210 | die("not a valid object: %s", buffer.buf); | |
211 | } | |
212 | ||
213 | static void reset_hard(unsigned const char *sha1, int verbose) | |
214 | { | |
215 | int i = 0; | |
216 | const char *args[6]; | |
217 | ||
218 | args[i++] = "read-tree"; | |
219 | if (verbose) | |
220 | args[i++] = "-v"; | |
221 | args[i++] = "--reset"; | |
222 | args[i++] = "-u"; | |
223 | args[i++] = sha1_to_hex(sha1); | |
224 | args[i] = NULL; | |
225 | ||
226 | if (run_command_v_opt(args, RUN_GIT_CMD)) | |
227 | die("read-tree failed"); | |
228 | } | |
229 | ||
230 | static void restore_state(void) | |
231 | { | |
f285a2d7 | 232 | struct strbuf sb = STRBUF_INIT; |
1c7b76be MV |
233 | const char *args[] = { "stash", "apply", NULL, NULL }; |
234 | ||
235 | if (is_null_sha1(stash)) | |
236 | return; | |
237 | ||
238 | reset_hard(head, 1); | |
239 | ||
1c7b76be MV |
240 | args[2] = sha1_to_hex(stash); |
241 | ||
242 | /* | |
243 | * It is OK to ignore error here, for example when there was | |
244 | * nothing to restore. | |
245 | */ | |
246 | run_command_v_opt(args, RUN_GIT_CMD); | |
247 | ||
248 | strbuf_release(&sb); | |
249 | refresh_cache(REFRESH_QUIET); | |
250 | } | |
251 | ||
252 | /* This is called when no merge was necessary. */ | |
253 | static void finish_up_to_date(const char *msg) | |
254 | { | |
7f87aff2 TA |
255 | if (verbosity >= 0) |
256 | printf("%s%s\n", squash ? " (nothing to squash)" : "", msg); | |
1c7b76be MV |
257 | drop_save(); |
258 | } | |
259 | ||
260 | static void squash_message(void) | |
261 | { | |
262 | struct rev_info rev; | |
263 | struct commit *commit; | |
f285a2d7 | 264 | struct strbuf out = STRBUF_INIT; |
1c7b76be MV |
265 | struct commit_list *j; |
266 | int fd; | |
267 | ||
268 | printf("Squash commit -- not updating HEAD\n"); | |
269 | fd = open(git_path("SQUASH_MSG"), O_WRONLY | O_CREAT, 0666); | |
270 | if (fd < 0) | |
0721c314 | 271 | die_errno("Could not write to '%s'", git_path("SQUASH_MSG")); |
1c7b76be MV |
272 | |
273 | init_revisions(&rev, NULL); | |
274 | rev.ignore_merges = 1; | |
275 | rev.commit_format = CMIT_FMT_MEDIUM; | |
276 | ||
277 | commit = lookup_commit(head); | |
278 | commit->object.flags |= UNINTERESTING; | |
279 | add_pending_object(&rev, &commit->object, NULL); | |
280 | ||
281 | for (j = remoteheads; j; j = j->next) | |
282 | add_pending_object(&rev, &j->item->object, NULL); | |
283 | ||
284 | setup_revisions(0, NULL, &rev, NULL); | |
285 | if (prepare_revision_walk(&rev)) | |
286 | die("revision walk setup failed"); | |
287 | ||
1c7b76be MV |
288 | strbuf_addstr(&out, "Squashed commit of the following:\n"); |
289 | while ((commit = get_revision(&rev)) != NULL) { | |
290 | strbuf_addch(&out, '\n'); | |
291 | strbuf_addf(&out, "commit %s\n", | |
292 | sha1_to_hex(commit->object.sha1)); | |
293 | pretty_print_commit(rev.commit_format, commit, &out, rev.abbrev, | |
294 | NULL, NULL, rev.date_mode, 0); | |
295 | } | |
47d32af2 | 296 | if (write(fd, out.buf, out.len) < 0) |
d824cbba | 297 | die_errno("Writing SQUASH_MSG"); |
47d32af2 | 298 | if (close(fd)) |
d824cbba | 299 | die_errno("Finishing SQUASH_MSG"); |
1c7b76be MV |
300 | strbuf_release(&out); |
301 | } | |
302 | ||
1c7b76be MV |
303 | static void finish(const unsigned char *new_head, const char *msg) |
304 | { | |
f285a2d7 | 305 | struct strbuf reflog_message = STRBUF_INIT; |
1c7b76be | 306 | |
1c7b76be MV |
307 | if (!msg) |
308 | strbuf_addstr(&reflog_message, getenv("GIT_REFLOG_ACTION")); | |
309 | else { | |
7f87aff2 TA |
310 | if (verbosity >= 0) |
311 | printf("%s\n", msg); | |
1c7b76be MV |
312 | strbuf_addf(&reflog_message, "%s: %s", |
313 | getenv("GIT_REFLOG_ACTION"), msg); | |
314 | } | |
315 | if (squash) { | |
316 | squash_message(); | |
317 | } else { | |
7f87aff2 | 318 | if (verbosity >= 0 && !merge_msg.len) |
1c7b76be MV |
319 | printf("No merge message -- not updating HEAD\n"); |
320 | else { | |
321 | const char *argv_gc_auto[] = { "gc", "--auto", NULL }; | |
322 | update_ref(reflog_message.buf, "HEAD", | |
323 | new_head, head, 0, | |
324 | DIE_ON_ERR); | |
325 | /* | |
326 | * We ignore errors in 'gc --auto', since the | |
327 | * user should see them. | |
328 | */ | |
329 | run_command_v_opt(argv_gc_auto, RUN_GIT_CMD); | |
330 | } | |
331 | } | |
332 | if (new_head && show_diffstat) { | |
333 | struct diff_options opts; | |
334 | diff_setup(&opts); | |
335 | opts.output_format |= | |
336 | DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT; | |
337 | opts.detect_rename = DIFF_DETECT_RENAME; | |
338 | if (diff_use_color_default > 0) | |
339 | DIFF_OPT_SET(&opts, COLOR_DIFF); | |
340 | if (diff_setup_done(&opts) < 0) | |
341 | die("diff_setup_done failed"); | |
342 | diff_tree_sha1(head, new_head, "", &opts); | |
343 | diffcore_std(&opts); | |
344 | diff_flush(&opts); | |
345 | } | |
346 | ||
347 | /* Run a post-merge hook */ | |
ae98a008 | 348 | run_hook(NULL, "post-merge", squash ? "1" : "0", NULL); |
1c7b76be MV |
349 | |
350 | strbuf_release(&reflog_message); | |
351 | } | |
352 | ||
353 | /* Get the name for the merge commit's message. */ | |
354 | static void merge_name(const char *remote, struct strbuf *msg) | |
355 | { | |
356 | struct object *remote_head; | |
357 | unsigned char branch_head[20], buf_sha[20]; | |
f285a2d7 | 358 | struct strbuf buf = STRBUF_INIT; |
c9717ee9 | 359 | struct strbuf bname = STRBUF_INIT; |
1c7b76be MV |
360 | const char *ptr; |
361 | int len, early; | |
362 | ||
a552de75 JH |
363 | strbuf_branchname(&bname, remote); |
364 | remote = bname.buf; | |
c9717ee9 | 365 | |
1c7b76be MV |
366 | memset(branch_head, 0, sizeof(branch_head)); |
367 | remote_head = peel_to_type(remote, 0, NULL, OBJ_COMMIT); | |
368 | if (!remote_head) | |
369 | die("'%s' does not point to a commit", remote); | |
370 | ||
1c7b76be MV |
371 | strbuf_addstr(&buf, "refs/heads/"); |
372 | strbuf_addstr(&buf, remote); | |
2af202be | 373 | resolve_ref(buf.buf, branch_head, 0, NULL); |
1c7b76be MV |
374 | |
375 | if (!hashcmp(remote_head->sha1, branch_head)) { | |
376 | strbuf_addf(msg, "%s\t\tbranch '%s' of .\n", | |
377 | sha1_to_hex(branch_head), remote); | |
c9717ee9 | 378 | goto cleanup; |
1c7b76be MV |
379 | } |
380 | ||
381 | /* See if remote matches <name>^^^.. or <name>~<number> */ | |
382 | for (len = 0, ptr = remote + strlen(remote); | |
383 | remote < ptr && ptr[-1] == '^'; | |
384 | ptr--) | |
385 | len++; | |
386 | if (len) | |
387 | early = 1; | |
388 | else { | |
389 | early = 0; | |
390 | ptr = strrchr(remote, '~'); | |
391 | if (ptr) { | |
392 | int seen_nonzero = 0; | |
393 | ||
394 | len++; /* count ~ */ | |
395 | while (*++ptr && isdigit(*ptr)) { | |
396 | seen_nonzero |= (*ptr != '0'); | |
397 | len++; | |
398 | } | |
399 | if (*ptr) | |
400 | len = 0; /* not ...~<number> */ | |
401 | else if (seen_nonzero) | |
402 | early = 1; | |
403 | else if (len == 1) | |
404 | early = 1; /* "name~" is "name~1"! */ | |
405 | } | |
406 | } | |
407 | if (len) { | |
408 | struct strbuf truname = STRBUF_INIT; | |
409 | strbuf_addstr(&truname, "refs/heads/"); | |
410 | strbuf_addstr(&truname, remote); | |
9b6bf4d5 | 411 | strbuf_setlen(&truname, truname.len - len); |
2af202be | 412 | if (resolve_ref(truname.buf, buf_sha, 0, NULL)) { |
1c7b76be MV |
413 | strbuf_addf(msg, |
414 | "%s\t\tbranch '%s'%s of .\n", | |
415 | sha1_to_hex(remote_head->sha1), | |
9b6bf4d5 | 416 | truname.buf + 11, |
1c7b76be | 417 | (early ? " (early part)" : "")); |
c9717ee9 JH |
418 | strbuf_release(&truname); |
419 | goto cleanup; | |
1c7b76be MV |
420 | } |
421 | } | |
422 | ||
423 | if (!strcmp(remote, "FETCH_HEAD") && | |
424 | !access(git_path("FETCH_HEAD"), R_OK)) { | |
425 | FILE *fp; | |
f285a2d7 | 426 | struct strbuf line = STRBUF_INIT; |
1c7b76be MV |
427 | char *ptr; |
428 | ||
1c7b76be MV |
429 | fp = fopen(git_path("FETCH_HEAD"), "r"); |
430 | if (!fp) | |
d824cbba TR |
431 | die_errno("could not open '%s' for reading", |
432 | git_path("FETCH_HEAD")); | |
1c7b76be MV |
433 | strbuf_getline(&line, fp, '\n'); |
434 | fclose(fp); | |
435 | ptr = strstr(line.buf, "\tnot-for-merge\t"); | |
436 | if (ptr) | |
437 | strbuf_remove(&line, ptr-line.buf+1, 13); | |
438 | strbuf_addbuf(msg, &line); | |
439 | strbuf_release(&line); | |
c9717ee9 | 440 | goto cleanup; |
1c7b76be MV |
441 | } |
442 | strbuf_addf(msg, "%s\t\tcommit '%s'\n", | |
443 | sha1_to_hex(remote_head->sha1), remote); | |
c9717ee9 JH |
444 | cleanup: |
445 | strbuf_release(&buf); | |
446 | strbuf_release(&bname); | |
1c7b76be MV |
447 | } |
448 | ||
186458b1 | 449 | static int git_merge_config(const char *k, const char *v, void *cb) |
1c7b76be MV |
450 | { |
451 | if (branch && !prefixcmp(k, "branch.") && | |
452 | !prefixcmp(k + 7, branch) && | |
453 | !strcmp(k + 7 + strlen(branch), ".mergeoptions")) { | |
454 | const char **argv; | |
455 | int argc; | |
456 | char *buf; | |
457 | ||
458 | buf = xstrdup(v); | |
459 | argc = split_cmdline(buf, &argv); | |
dc4179f9 DM |
460 | if (argc < 0) |
461 | die("Bad branch.%s.mergeoptions string", branch); | |
1c7b76be MV |
462 | argv = xrealloc(argv, sizeof(*argv) * (argc + 2)); |
463 | memmove(argv + 1, argv, sizeof(*argv) * (argc + 1)); | |
464 | argc++; | |
37782920 | 465 | parse_options(argc, argv, NULL, builtin_merge_options, |
1c7b76be MV |
466 | builtin_merge_usage, 0); |
467 | free(buf); | |
468 | } | |
469 | ||
470 | if (!strcmp(k, "merge.diffstat") || !strcmp(k, "merge.stat")) | |
471 | show_diffstat = git_config_bool(k, v); | |
472 | else if (!strcmp(k, "pull.twohead")) | |
473 | return git_config_string(&pull_twohead, k, v); | |
474 | else if (!strcmp(k, "pull.octopus")) | |
475 | return git_config_string(&pull_octopus, k, v); | |
4393c237 JH |
476 | else if (!strcmp(k, "merge.log") || !strcmp(k, "merge.summary")) |
477 | option_log = git_config_bool(k, v); | |
1c7b76be MV |
478 | return git_diff_ui_config(k, v, cb); |
479 | } | |
480 | ||
481 | static int read_tree_trivial(unsigned char *common, unsigned char *head, | |
482 | unsigned char *one) | |
483 | { | |
484 | int i, nr_trees = 0; | |
485 | struct tree *trees[MAX_UNPACK_TREES]; | |
486 | struct tree_desc t[MAX_UNPACK_TREES]; | |
487 | struct unpack_trees_options opts; | |
488 | ||
489 | memset(&opts, 0, sizeof(opts)); | |
490 | opts.head_idx = 2; | |
491 | opts.src_index = &the_index; | |
492 | opts.dst_index = &the_index; | |
493 | opts.update = 1; | |
494 | opts.verbose_update = 1; | |
495 | opts.trivial_merges_only = 1; | |
496 | opts.merge = 1; | |
497 | trees[nr_trees] = parse_tree_indirect(common); | |
498 | if (!trees[nr_trees++]) | |
499 | return -1; | |
500 | trees[nr_trees] = parse_tree_indirect(head); | |
501 | if (!trees[nr_trees++]) | |
502 | return -1; | |
503 | trees[nr_trees] = parse_tree_indirect(one); | |
504 | if (!trees[nr_trees++]) | |
505 | return -1; | |
506 | opts.fn = threeway_merge; | |
507 | cache_tree_free(&active_cache_tree); | |
508 | for (i = 0; i < nr_trees; i++) { | |
509 | parse_tree(trees[i]); | |
510 | init_tree_desc(t+i, trees[i]->buffer, trees[i]->size); | |
511 | } | |
512 | if (unpack_trees(nr_trees, t, &opts)) | |
513 | return -1; | |
514 | return 0; | |
515 | } | |
516 | ||
517 | static void write_tree_trivial(unsigned char *sha1) | |
518 | { | |
519 | if (write_cache_as_tree(sha1, 0, NULL)) | |
520 | die("git write-tree failed to write a tree"); | |
521 | } | |
522 | ||
523 | static int try_merge_strategy(const char *strategy, struct commit_list *common, | |
524 | const char *head_arg) | |
525 | { | |
526 | const char **args; | |
527 | int i = 0, ret; | |
528 | struct commit_list *j; | |
f285a2d7 | 529 | struct strbuf buf = STRBUF_INIT; |
668f26ff MV |
530 | int index_fd; |
531 | struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); | |
532 | ||
533 | index_fd = hold_locked_index(lock, 1); | |
534 | refresh_cache(REFRESH_QUIET); | |
535 | if (active_cache_changed && | |
536 | (write_cache(index_fd, active_cache, active_nr) || | |
537 | commit_locked_index(lock))) | |
538 | return error("Unable to write index."); | |
539 | rollback_lock_file(lock); | |
1c7b76be | 540 | |
18668f53 MV |
541 | if (!strcmp(strategy, "recursive") || !strcmp(strategy, "subtree")) { |
542 | int clean; | |
543 | struct commit *result; | |
544 | struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); | |
545 | int index_fd; | |
546 | struct commit_list *reversed = NULL; | |
547 | struct merge_options o; | |
548 | ||
549 | if (remoteheads->next) { | |
550 | error("Not handling anything other than two heads merge."); | |
551 | return 2; | |
552 | } | |
553 | ||
554 | init_merge_options(&o); | |
555 | if (!strcmp(strategy, "subtree")) | |
556 | o.subtree_merge = 1; | |
557 | ||
558 | o.branch1 = head_arg; | |
559 | o.branch2 = remoteheads->item->util; | |
560 | ||
561 | for (j = common; j; j = j->next) | |
562 | commit_list_insert(j->item, &reversed); | |
563 | ||
564 | index_fd = hold_locked_index(lock, 1); | |
565 | clean = merge_recursive(&o, lookup_commit(head), | |
566 | remoteheads->item, reversed, &result); | |
567 | if (active_cache_changed && | |
568 | (write_cache(index_fd, active_cache, active_nr) || | |
569 | commit_locked_index(lock))) | |
570 | die ("unable to write %s", get_index_file()); | |
42716660 | 571 | rollback_lock_file(lock); |
18668f53 MV |
572 | return clean ? 0 : 1; |
573 | } else { | |
574 | args = xmalloc((4 + commit_list_count(common) + | |
575 | commit_list_count(remoteheads)) * sizeof(char *)); | |
18668f53 MV |
576 | strbuf_addf(&buf, "merge-%s", strategy); |
577 | args[i++] = buf.buf; | |
578 | for (j = common; j; j = j->next) | |
579 | args[i++] = xstrdup(sha1_to_hex(j->item->object.sha1)); | |
580 | args[i++] = "--"; | |
581 | args[i++] = head_arg; | |
582 | for (j = remoteheads; j; j = j->next) | |
583 | args[i++] = xstrdup(sha1_to_hex(j->item->object.sha1)); | |
584 | args[i] = NULL; | |
585 | ret = run_command_v_opt(args, RUN_GIT_CMD); | |
586 | strbuf_release(&buf); | |
587 | i = 1; | |
588 | for (j = common; j; j = j->next) | |
589 | free((void *)args[i++]); | |
590 | i += 2; | |
591 | for (j = remoteheads; j; j = j->next) | |
592 | free((void *)args[i++]); | |
593 | free(args); | |
594 | discard_cache(); | |
595 | if (read_cache() < 0) | |
596 | die("failed to read the cache"); | |
597 | return -ret; | |
598 | } | |
1c7b76be MV |
599 | } |
600 | ||
601 | static void count_diff_files(struct diff_queue_struct *q, | |
602 | struct diff_options *opt, void *data) | |
603 | { | |
604 | int *count = data; | |
605 | ||
606 | (*count) += q->nr; | |
607 | } | |
608 | ||
609 | static int count_unmerged_entries(void) | |
610 | { | |
611 | const struct index_state *state = &the_index; | |
612 | int i, ret = 0; | |
613 | ||
614 | for (i = 0; i < state->cache_nr; i++) | |
615 | if (ce_stage(state->cache[i])) | |
616 | ret++; | |
617 | ||
618 | return ret; | |
619 | } | |
620 | ||
621 | static int checkout_fast_forward(unsigned char *head, unsigned char *remote) | |
622 | { | |
623 | struct tree *trees[MAX_UNPACK_TREES]; | |
624 | struct unpack_trees_options opts; | |
625 | struct tree_desc t[MAX_UNPACK_TREES]; | |
626 | int i, fd, nr_trees = 0; | |
627 | struct dir_struct dir; | |
628 | struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file)); | |
629 | ||
9ca8f607 | 630 | refresh_cache(REFRESH_QUIET); |
1c7b76be MV |
631 | |
632 | fd = hold_locked_index(lock_file, 1); | |
633 | ||
634 | memset(&trees, 0, sizeof(trees)); | |
635 | memset(&opts, 0, sizeof(opts)); | |
636 | memset(&t, 0, sizeof(t)); | |
5d2299de | 637 | memset(&dir, 0, sizeof(dir)); |
7c4c97c0 | 638 | dir.flags |= DIR_SHOW_IGNORED; |
1c7b76be MV |
639 | dir.exclude_per_dir = ".gitignore"; |
640 | opts.dir = &dir; | |
641 | ||
642 | opts.head_idx = 1; | |
643 | opts.src_index = &the_index; | |
644 | opts.dst_index = &the_index; | |
645 | opts.update = 1; | |
646 | opts.verbose_update = 1; | |
647 | opts.merge = 1; | |
648 | opts.fn = twoway_merge; | |
649 | ||
650 | trees[nr_trees] = parse_tree_indirect(head); | |
651 | if (!trees[nr_trees++]) | |
652 | return -1; | |
653 | trees[nr_trees] = parse_tree_indirect(remote); | |
654 | if (!trees[nr_trees++]) | |
655 | return -1; | |
656 | for (i = 0; i < nr_trees; i++) { | |
657 | parse_tree(trees[i]); | |
658 | init_tree_desc(t+i, trees[i]->buffer, trees[i]->size); | |
659 | } | |
660 | if (unpack_trees(nr_trees, t, &opts)) | |
661 | return -1; | |
662 | if (write_cache(fd, active_cache, active_nr) || | |
663 | commit_locked_index(lock_file)) | |
664 | die("unable to write new index file"); | |
665 | return 0; | |
666 | } | |
667 | ||
668 | static void split_merge_strategies(const char *string, struct strategy **list, | |
669 | int *nr, int *alloc) | |
670 | { | |
671 | char *p, *q, *buf; | |
672 | ||
673 | if (!string) | |
674 | return; | |
675 | ||
676 | buf = xstrdup(string); | |
677 | q = buf; | |
678 | for (;;) { | |
679 | p = strchr(q, ' '); | |
680 | if (!p) { | |
681 | ALLOC_GROW(*list, *nr + 1, *alloc); | |
682 | (*list)[(*nr)++].name = xstrdup(q); | |
683 | free(buf); | |
684 | return; | |
685 | } else { | |
686 | *p = '\0'; | |
687 | ALLOC_GROW(*list, *nr + 1, *alloc); | |
688 | (*list)[(*nr)++].name = xstrdup(q); | |
689 | q = ++p; | |
690 | } | |
691 | } | |
692 | } | |
693 | ||
694 | static void add_strategies(const char *string, unsigned attr) | |
695 | { | |
696 | struct strategy *list = NULL; | |
697 | int list_alloc = 0, list_nr = 0, i; | |
698 | ||
699 | memset(&list, 0, sizeof(list)); | |
700 | split_merge_strategies(string, &list, &list_nr, &list_alloc); | |
1719b5e4 MV |
701 | if (list) { |
702 | for (i = 0; i < list_nr; i++) | |
703 | append_strategy(get_strategy(list[i].name)); | |
1c7b76be MV |
704 | return; |
705 | } | |
706 | for (i = 0; i < ARRAY_SIZE(all_strategy); i++) | |
707 | if (all_strategy[i].attr & attr) | |
708 | append_strategy(&all_strategy[i]); | |
709 | ||
710 | } | |
711 | ||
712 | static int merge_trivial(void) | |
713 | { | |
714 | unsigned char result_tree[20], result_commit[20]; | |
36e40535 | 715 | struct commit_list *parent = xmalloc(sizeof(*parent)); |
1c7b76be MV |
716 | |
717 | write_tree_trivial(result_tree); | |
718 | printf("Wonderful.\n"); | |
446247db | 719 | parent->item = lookup_commit(head); |
36e40535 | 720 | parent->next = xmalloc(sizeof(*parent->next)); |
446247db JH |
721 | parent->next->item = remoteheads->item; |
722 | parent->next->next = NULL; | |
ee20a129 | 723 | commit_tree(merge_msg.buf, result_tree, parent, result_commit, NULL); |
1c7b76be MV |
724 | finish(result_commit, "In-index merge"); |
725 | drop_save(); | |
726 | return 0; | |
727 | } | |
728 | ||
729 | static int finish_automerge(struct commit_list *common, | |
730 | unsigned char *result_tree, | |
731 | const char *wt_strategy) | |
732 | { | |
733 | struct commit_list *parents = NULL, *j; | |
734 | struct strbuf buf = STRBUF_INIT; | |
735 | unsigned char result_commit[20]; | |
736 | ||
737 | free_commit_list(common); | |
738 | if (allow_fast_forward) { | |
739 | parents = remoteheads; | |
740 | commit_list_insert(lookup_commit(head), &parents); | |
741 | parents = reduce_heads(parents); | |
742 | } else { | |
743 | struct commit_list **pptr = &parents; | |
744 | ||
745 | pptr = &commit_list_insert(lookup_commit(head), | |
746 | pptr)->next; | |
747 | for (j = remoteheads; j; j = j->next) | |
748 | pptr = &commit_list_insert(j->item, pptr)->next; | |
749 | } | |
750 | free_commit_list(remoteheads); | |
751 | strbuf_addch(&merge_msg, '\n'); | |
ee20a129 | 752 | commit_tree(merge_msg.buf, result_tree, parents, result_commit, NULL); |
1c7b76be MV |
753 | strbuf_addf(&buf, "Merge made by %s.", wt_strategy); |
754 | finish(result_commit, buf.buf); | |
755 | strbuf_release(&buf); | |
756 | drop_save(); | |
757 | return 0; | |
758 | } | |
759 | ||
760 | static int suggest_conflicts(void) | |
761 | { | |
762 | FILE *fp; | |
763 | int pos; | |
764 | ||
765 | fp = fopen(git_path("MERGE_MSG"), "a"); | |
766 | if (!fp) | |
0721c314 TR |
767 | die_errno("Could not open '%s' for writing", |
768 | git_path("MERGE_MSG")); | |
1c7b76be MV |
769 | fprintf(fp, "\nConflicts:\n"); |
770 | for (pos = 0; pos < active_nr; pos++) { | |
771 | struct cache_entry *ce = active_cache[pos]; | |
772 | ||
773 | if (ce_stage(ce)) { | |
774 | fprintf(fp, "\t%s\n", ce->name); | |
775 | while (pos + 1 < active_nr && | |
776 | !strcmp(ce->name, | |
777 | active_cache[pos + 1]->name)) | |
778 | pos++; | |
779 | } | |
780 | } | |
781 | fclose(fp); | |
782 | rerere(); | |
783 | printf("Automatic merge failed; " | |
784 | "fix conflicts and then commit the result.\n"); | |
785 | return 1; | |
786 | } | |
787 | ||
788 | static struct commit *is_old_style_invocation(int argc, const char **argv) | |
789 | { | |
790 | struct commit *second_token = NULL; | |
791 | if (argc > 1) { | |
792 | unsigned char second_sha1[20]; | |
793 | ||
794 | if (get_sha1(argv[1], second_sha1)) | |
795 | return NULL; | |
796 | second_token = lookup_commit_reference_gently(second_sha1, 0); | |
797 | if (!second_token) | |
798 | die("'%s' is not a commit", argv[1]); | |
799 | if (hashcmp(second_token->object.sha1, head)) | |
800 | return NULL; | |
801 | } | |
802 | return second_token; | |
803 | } | |
804 | ||
805 | static int evaluate_result(void) | |
806 | { | |
807 | int cnt = 0; | |
808 | struct rev_info rev; | |
809 | ||
1c7b76be MV |
810 | /* Check how many files differ. */ |
811 | init_revisions(&rev, ""); | |
812 | setup_revisions(0, NULL, &rev, NULL); | |
813 | rev.diffopt.output_format |= | |
814 | DIFF_FORMAT_CALLBACK; | |
815 | rev.diffopt.format_callback = count_diff_files; | |
816 | rev.diffopt.format_callback_data = &cnt; | |
817 | run_diff_files(&rev, 0); | |
818 | ||
819 | /* | |
820 | * Check how many unmerged entries are | |
821 | * there. | |
822 | */ | |
823 | cnt += count_unmerged_entries(); | |
824 | ||
825 | return cnt; | |
826 | } | |
827 | ||
828 | int cmd_merge(int argc, const char **argv, const char *prefix) | |
829 | { | |
830 | unsigned char result_tree[20]; | |
f285a2d7 | 831 | struct strbuf buf = STRBUF_INIT; |
1c7b76be MV |
832 | const char *head_arg; |
833 | int flag, head_invalid = 0, i; | |
834 | int best_cnt = -1, merge_was_ok = 0, automerge_was_ok = 0; | |
835 | struct commit_list *common = NULL; | |
836 | const char *best_strategy = NULL, *wt_strategy = NULL; | |
837 | struct commit_list **remotes = &remoteheads; | |
838 | ||
839 | setup_work_tree(); | |
c8c562a2 CB |
840 | if (file_exists(git_path("MERGE_HEAD"))) |
841 | die("You have not concluded your merge. (MERGE_HEAD exists)"); | |
446247db | 842 | if (read_cache_unmerged()) |
c8c562a2 CB |
843 | die("You are in the middle of a conflicted merge." |
844 | " (index unmerged)"); | |
1c7b76be MV |
845 | |
846 | /* | |
847 | * Check if we are _not_ on a detached HEAD, i.e. if there is a | |
848 | * current branch. | |
849 | */ | |
850 | branch = resolve_ref("HEAD", head, 0, &flag); | |
851 | if (branch && !prefixcmp(branch, "refs/heads/")) | |
852 | branch += 11; | |
853 | if (is_null_sha1(head)) | |
854 | head_invalid = 1; | |
855 | ||
856 | git_config(git_merge_config, NULL); | |
857 | ||
858 | /* for color.ui */ | |
859 | if (diff_use_color_default == -1) | |
860 | diff_use_color_default = git_use_color_default; | |
861 | ||
37782920 | 862 | argc = parse_options(argc, argv, prefix, builtin_merge_options, |
1c7b76be | 863 | builtin_merge_usage, 0); |
7f87aff2 TA |
864 | if (verbosity < 0) |
865 | show_diffstat = 0; | |
1c7b76be MV |
866 | |
867 | if (squash) { | |
868 | if (!allow_fast_forward) | |
869 | die("You cannot combine --squash with --no-ff."); | |
870 | option_commit = 0; | |
871 | } | |
872 | ||
873 | if (!argc) | |
874 | usage_with_options(builtin_merge_usage, | |
875 | builtin_merge_options); | |
876 | ||
877 | /* | |
878 | * This could be traditional "merge <msg> HEAD <commit>..." and | |
879 | * the way we can tell it is to see if the second token is HEAD, | |
880 | * but some people might have misused the interface and used a | |
881 | * committish that is the same as HEAD there instead. | |
882 | * Traditional format never would have "-m" so it is an | |
883 | * additional safety measure to check for it. | |
884 | */ | |
1c7b76be MV |
885 | |
886 | if (!have_message && is_old_style_invocation(argc, argv)) { | |
887 | strbuf_addstr(&merge_msg, argv[0]); | |
888 | head_arg = argv[1]; | |
889 | argv += 2; | |
890 | argc -= 2; | |
891 | } else if (head_invalid) { | |
892 | struct object *remote_head; | |
893 | /* | |
894 | * If the merged head is a valid one there is no reason | |
895 | * to forbid "git merge" into a branch yet to be born. | |
896 | * We do the same for "git pull". | |
897 | */ | |
898 | if (argc != 1) | |
899 | die("Can merge only exactly one commit into " | |
900 | "empty head"); | |
4be636f4 PB |
901 | if (squash) |
902 | die("Squash commit into empty head not supported yet"); | |
903 | if (!allow_fast_forward) | |
904 | die("Non-fast-forward commit does not make sense into " | |
905 | "an empty head"); | |
1c7b76be MV |
906 | remote_head = peel_to_type(argv[0], 0, NULL, OBJ_COMMIT); |
907 | if (!remote_head) | |
908 | die("%s - not something we can merge", argv[0]); | |
909 | update_ref("initial pull", "HEAD", remote_head->sha1, NULL, 0, | |
910 | DIE_ON_ERR); | |
911 | reset_hard(remote_head->sha1, 0); | |
912 | return 0; | |
913 | } else { | |
f285a2d7 | 914 | struct strbuf msg = STRBUF_INIT; |
1c7b76be MV |
915 | |
916 | /* We are invoked directly as the first-class UI. */ | |
917 | head_arg = "HEAD"; | |
918 | ||
919 | /* | |
920 | * All the rest are the commits being merged; | |
921 | * prepare the standard merge summary message to | |
922 | * be appended to the given message. If remote | |
923 | * is invalid we will die later in the common | |
924 | * codepath so we discard the error in this | |
925 | * loop. | |
926 | */ | |
1c7b76be MV |
927 | for (i = 0; i < argc; i++) |
928 | merge_name(argv[i], &msg); | |
929 | fmt_merge_msg(option_log, &msg, &merge_msg); | |
930 | if (merge_msg.len) | |
931 | strbuf_setlen(&merge_msg, merge_msg.len-1); | |
932 | } | |
933 | ||
934 | if (head_invalid || !argc) | |
935 | usage_with_options(builtin_merge_usage, | |
936 | builtin_merge_options); | |
937 | ||
938 | strbuf_addstr(&buf, "merge"); | |
939 | for (i = 0; i < argc; i++) | |
940 | strbuf_addf(&buf, " %s", argv[i]); | |
941 | setenv("GIT_REFLOG_ACTION", buf.buf, 0); | |
942 | strbuf_reset(&buf); | |
943 | ||
944 | for (i = 0; i < argc; i++) { | |
945 | struct object *o; | |
18668f53 | 946 | struct commit *commit; |
1c7b76be MV |
947 | |
948 | o = peel_to_type(argv[i], 0, NULL, OBJ_COMMIT); | |
949 | if (!o) | |
950 | die("%s - not something we can merge", argv[i]); | |
18668f53 MV |
951 | commit = lookup_commit(o->sha1); |
952 | commit->util = (void *)argv[i]; | |
953 | remotes = &commit_list_insert(commit, remotes)->next; | |
1c7b76be MV |
954 | |
955 | strbuf_addf(&buf, "GITHEAD_%s", sha1_to_hex(o->sha1)); | |
956 | setenv(buf.buf, argv[i], 1); | |
957 | strbuf_reset(&buf); | |
958 | } | |
959 | ||
960 | if (!use_strategies) { | |
961 | if (!remoteheads->next) | |
962 | add_strategies(pull_twohead, DEFAULT_TWOHEAD); | |
963 | else | |
964 | add_strategies(pull_octopus, DEFAULT_OCTOPUS); | |
965 | } | |
966 | ||
967 | for (i = 0; i < use_strategies_nr; i++) { | |
968 | if (use_strategies[i]->attr & NO_FAST_FORWARD) | |
969 | allow_fast_forward = 0; | |
970 | if (use_strategies[i]->attr & NO_TRIVIAL) | |
971 | allow_trivial = 0; | |
972 | } | |
973 | ||
974 | if (!remoteheads->next) | |
975 | common = get_merge_bases(lookup_commit(head), | |
976 | remoteheads->item, 1); | |
977 | else { | |
978 | struct commit_list *list = remoteheads; | |
979 | commit_list_insert(lookup_commit(head), &list); | |
980 | common = get_octopus_merge_bases(list); | |
981 | free(list); | |
982 | } | |
983 | ||
984 | update_ref("updating ORIG_HEAD", "ORIG_HEAD", head, NULL, 0, | |
985 | DIE_ON_ERR); | |
986 | ||
987 | if (!common) | |
988 | ; /* No common ancestors found. We need a real merge. */ | |
989 | else if (!remoteheads->next && !common->next && | |
990 | common->item == remoteheads->item) { | |
991 | /* | |
992 | * If head can reach all the merge then we are up to date. | |
993 | * but first the most common case of merging one remote. | |
994 | */ | |
995 | finish_up_to_date("Already up-to-date."); | |
996 | return 0; | |
997 | } else if (allow_fast_forward && !remoteheads->next && | |
998 | !common->next && | |
999 | !hashcmp(common->item->object.sha1, head)) { | |
1000 | /* Again the most common case of merging one remote. */ | |
f285a2d7 | 1001 | struct strbuf msg = STRBUF_INIT; |
1c7b76be MV |
1002 | struct object *o; |
1003 | char hex[41]; | |
1004 | ||
1005 | strcpy(hex, find_unique_abbrev(head, DEFAULT_ABBREV)); | |
1006 | ||
7f87aff2 TA |
1007 | if (verbosity >= 0) |
1008 | printf("Updating %s..%s\n", | |
1009 | hex, | |
1010 | find_unique_abbrev(remoteheads->item->object.sha1, | |
1011 | DEFAULT_ABBREV)); | |
1c7b76be MV |
1012 | strbuf_addstr(&msg, "Fast forward"); |
1013 | if (have_message) | |
1014 | strbuf_addstr(&msg, | |
1015 | " (no commit created; -m option ignored)"); | |
1016 | o = peel_to_type(sha1_to_hex(remoteheads->item->object.sha1), | |
1017 | 0, NULL, OBJ_COMMIT); | |
1018 | if (!o) | |
1019 | return 1; | |
1020 | ||
1021 | if (checkout_fast_forward(head, remoteheads->item->object.sha1)) | |
1022 | return 1; | |
1023 | ||
1024 | finish(o->sha1, msg.buf); | |
1025 | drop_save(); | |
1026 | return 0; | |
1027 | } else if (!remoteheads->next && common->next) | |
1028 | ; | |
1029 | /* | |
1030 | * We are not doing octopus and not fast forward. Need | |
1031 | * a real merge. | |
1032 | */ | |
1033 | else if (!remoteheads->next && !common->next && option_commit) { | |
1034 | /* | |
1035 | * We are not doing octopus, not fast forward, and have | |
1036 | * only one common. | |
1037 | */ | |
1038 | refresh_cache(REFRESH_QUIET); | |
1039 | if (allow_trivial) { | |
1040 | /* See if it is really trivial. */ | |
1041 | git_committer_info(IDENT_ERROR_ON_NO_NAME); | |
1042 | printf("Trying really trivial in-index merge...\n"); | |
1043 | if (!read_tree_trivial(common->item->object.sha1, | |
1044 | head, remoteheads->item->object.sha1)) | |
1045 | return merge_trivial(); | |
1046 | printf("Nope.\n"); | |
1047 | } | |
1048 | } else { | |
1049 | /* | |
1050 | * An octopus. If we can reach all the remote we are up | |
1051 | * to date. | |
1052 | */ | |
1053 | int up_to_date = 1; | |
1054 | struct commit_list *j; | |
1055 | ||
1056 | for (j = remoteheads; j; j = j->next) { | |
1057 | struct commit_list *common_one; | |
1058 | ||
1059 | /* | |
1060 | * Here we *have* to calculate the individual | |
1061 | * merge_bases again, otherwise "git merge HEAD^ | |
1062 | * HEAD^^" would be missed. | |
1063 | */ | |
1064 | common_one = get_merge_bases(lookup_commit(head), | |
1065 | j->item, 1); | |
1066 | if (hashcmp(common_one->item->object.sha1, | |
1067 | j->item->object.sha1)) { | |
1068 | up_to_date = 0; | |
1069 | break; | |
1070 | } | |
1071 | } | |
1072 | if (up_to_date) { | |
1073 | finish_up_to_date("Already up-to-date. Yeeah!"); | |
1074 | return 0; | |
1075 | } | |
1076 | } | |
1077 | ||
1078 | /* We are going to make a new commit. */ | |
1079 | git_committer_info(IDENT_ERROR_ON_NO_NAME); | |
1080 | ||
1081 | /* | |
1082 | * At this point, we need a real merge. No matter what strategy | |
1083 | * we use, it would operate on the index, possibly affecting the | |
1084 | * working tree, and when resolved cleanly, have the desired | |
1085 | * tree in the index -- this means that the index must be in | |
1086 | * sync with the head commit. The strategies are responsible | |
1087 | * to ensure this. | |
1088 | */ | |
1089 | if (use_strategies_nr != 1) { | |
1090 | /* | |
1091 | * Stash away the local changes so that we can try more | |
1092 | * than one. | |
1093 | */ | |
1094 | save_state(); | |
1095 | } else { | |
1096 | memcpy(stash, null_sha1, 20); | |
1097 | } | |
1098 | ||
1099 | for (i = 0; i < use_strategies_nr; i++) { | |
1100 | int ret; | |
1101 | if (i) { | |
1102 | printf("Rewinding the tree to pristine...\n"); | |
1103 | restore_state(); | |
1104 | } | |
1105 | if (use_strategies_nr != 1) | |
1106 | printf("Trying merge strategy %s...\n", | |
1107 | use_strategies[i]->name); | |
1108 | /* | |
1109 | * Remember which strategy left the state in the working | |
1110 | * tree. | |
1111 | */ | |
1112 | wt_strategy = use_strategies[i]->name; | |
1113 | ||
1114 | ret = try_merge_strategy(use_strategies[i]->name, | |
1115 | common, head_arg); | |
1116 | if (!option_commit && !ret) { | |
1117 | merge_was_ok = 1; | |
1118 | /* | |
1119 | * This is necessary here just to avoid writing | |
1120 | * the tree, but later we will *not* exit with | |
1121 | * status code 1 because merge_was_ok is set. | |
1122 | */ | |
1123 | ret = 1; | |
1124 | } | |
1125 | ||
1126 | if (ret) { | |
1127 | /* | |
1128 | * The backend exits with 1 when conflicts are | |
1129 | * left to be resolved, with 2 when it does not | |
1130 | * handle the given merge at all. | |
1131 | */ | |
1132 | if (ret == 1) { | |
1133 | int cnt = evaluate_result(); | |
1134 | ||
1135 | if (best_cnt <= 0 || cnt <= best_cnt) { | |
1136 | best_strategy = use_strategies[i]->name; | |
1137 | best_cnt = cnt; | |
1138 | } | |
1139 | } | |
1140 | if (merge_was_ok) | |
1141 | break; | |
1142 | else | |
1143 | continue; | |
1144 | } | |
1145 | ||
1146 | /* Automerge succeeded. */ | |
1147 | write_tree_trivial(result_tree); | |
1148 | automerge_was_ok = 1; | |
1149 | break; | |
1150 | } | |
1151 | ||
1152 | /* | |
1153 | * If we have a resulting tree, that means the strategy module | |
1154 | * auto resolved the merge cleanly. | |
1155 | */ | |
1156 | if (automerge_was_ok) | |
1157 | return finish_automerge(common, result_tree, wt_strategy); | |
1158 | ||
1159 | /* | |
1160 | * Pick the result from the best strategy and have the user fix | |
1161 | * it up. | |
1162 | */ | |
1163 | if (!best_strategy) { | |
1164 | restore_state(); | |
1165 | if (use_strategies_nr > 1) | |
1166 | fprintf(stderr, | |
1167 | "No merge strategy handled the merge.\n"); | |
1168 | else | |
1169 | fprintf(stderr, "Merge with strategy %s failed.\n", | |
1170 | use_strategies[0]->name); | |
1171 | return 2; | |
1172 | } else if (best_strategy == wt_strategy) | |
1173 | ; /* We already have its result in the working tree. */ | |
1174 | else { | |
1175 | printf("Rewinding the tree to pristine...\n"); | |
1176 | restore_state(); | |
1177 | printf("Using the %s to prepare resolving by hand.\n", | |
1178 | best_strategy); | |
1179 | try_merge_strategy(best_strategy, common, head_arg); | |
1180 | } | |
1181 | ||
1182 | if (squash) | |
1183 | finish(NULL, NULL); | |
1184 | else { | |
1185 | int fd; | |
1186 | struct commit_list *j; | |
1187 | ||
1188 | for (j = remoteheads; j; j = j->next) | |
1189 | strbuf_addf(&buf, "%s\n", | |
1190 | sha1_to_hex(j->item->object.sha1)); | |
1191 | fd = open(git_path("MERGE_HEAD"), O_WRONLY | O_CREAT, 0666); | |
1192 | if (fd < 0) | |
0721c314 TR |
1193 | die_errno("Could not open '%s' for writing", |
1194 | git_path("MERGE_HEAD")); | |
1c7b76be | 1195 | if (write_in_full(fd, buf.buf, buf.len) != buf.len) |
0721c314 | 1196 | die_errno("Could not write to '%s'", git_path("MERGE_HEAD")); |
1c7b76be MV |
1197 | close(fd); |
1198 | strbuf_addch(&merge_msg, '\n'); | |
1199 | fd = open(git_path("MERGE_MSG"), O_WRONLY | O_CREAT, 0666); | |
1200 | if (fd < 0) | |
0721c314 TR |
1201 | die_errno("Could not open '%s' for writing", |
1202 | git_path("MERGE_MSG")); | |
1c7b76be MV |
1203 | if (write_in_full(fd, merge_msg.buf, merge_msg.len) != |
1204 | merge_msg.len) | |
0721c314 | 1205 | die_errno("Could not write to '%s'", git_path("MERGE_MSG")); |
1c7b76be | 1206 | close(fd); |
cf10f9fd MV |
1207 | fd = open(git_path("MERGE_MODE"), O_WRONLY | O_CREAT | O_TRUNC, 0666); |
1208 | if (fd < 0) | |
0721c314 TR |
1209 | die_errno("Could not open '%s' for writing", |
1210 | git_path("MERGE_MODE")); | |
cf10f9fd MV |
1211 | strbuf_reset(&buf); |
1212 | if (!allow_fast_forward) | |
1213 | strbuf_addf(&buf, "no-ff"); | |
1214 | if (write_in_full(fd, buf.buf, buf.len) != buf.len) | |
0721c314 | 1215 | die_errno("Could not write to '%s'", git_path("MERGE_MODE")); |
cf10f9fd | 1216 | close(fd); |
1c7b76be MV |
1217 | } |
1218 | ||
1219 | if (merge_was_ok) { | |
1220 | fprintf(stderr, "Automatic merge went well; " | |
1221 | "stopped before committing as requested\n"); | |
1222 | return 0; | |
1223 | } else | |
1224 | return suggest_conflicts(); | |
1225 | } |