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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" |
cfc5789a | 27 | #include "resolve-undo.h" |
93e535a5 | 28 | #include "remote.h" |
1c7b76be MV |
29 | |
30 | #define DEFAULT_TWOHEAD (1<<0) | |
31 | #define DEFAULT_OCTOPUS (1<<1) | |
32 | #define NO_FAST_FORWARD (1<<2) | |
33 | #define NO_TRIVIAL (1<<3) | |
34 | ||
35 | struct strategy { | |
36 | const char *name; | |
37 | unsigned attr; | |
38 | }; | |
39 | ||
40 | static const char * const builtin_merge_usage[] = { | |
93e535a5 | 41 | "git merge [options] [<commit>...]", |
c395c25b JH |
42 | "git merge [options] <msg> HEAD <commit>", |
43 | "git merge --abort", | |
1c7b76be MV |
44 | NULL |
45 | }; | |
46 | ||
96e9420c | 47 | static int show_diffstat = 1, shortlog_len, squash; |
1c7b76be | 48 | static int option_commit = 1, allow_fast_forward = 1; |
13474835 | 49 | static int fast_forward_only; |
1c7b76be MV |
50 | static int allow_trivial = 1, have_message; |
51 | static struct strbuf merge_msg; | |
52 | static struct commit_list *remoteheads; | |
53 | static unsigned char head[20], stash[20]; | |
54 | static struct strategy **use_strategies; | |
55 | static size_t use_strategies_nr, use_strategies_alloc; | |
8cc5b290 AP |
56 | static const char **xopts; |
57 | static size_t xopts_nr, xopts_alloc; | |
1c7b76be | 58 | static const char *branch; |
0d8fc3ef | 59 | static char *branch_mergeoptions; |
7610fa57 | 60 | static int option_renormalize; |
7f87aff2 | 61 | static int verbosity; |
cb6020bb | 62 | static int allow_rerere_auto; |
35d2fffd | 63 | static int abort_current_merge; |
99bfc669 | 64 | static int show_progress = -1; |
93e535a5 | 65 | static int default_to_upstream; |
1c7b76be MV |
66 | |
67 | static struct strategy all_strategy[] = { | |
1c7b76be MV |
68 | { "recursive", DEFAULT_TWOHEAD | NO_TRIVIAL }, |
69 | { "octopus", DEFAULT_OCTOPUS }, | |
70 | { "resolve", 0 }, | |
1c7b76be MV |
71 | { "ours", NO_FAST_FORWARD | NO_TRIVIAL }, |
72 | { "subtree", NO_FAST_FORWARD | NO_TRIVIAL }, | |
73 | }; | |
74 | ||
75 | static const char *pull_twohead, *pull_octopus; | |
76 | ||
77 | static int option_parse_message(const struct option *opt, | |
78 | const char *arg, int unset) | |
79 | { | |
80 | struct strbuf *buf = opt->value; | |
81 | ||
82 | if (unset) | |
83 | strbuf_setlen(buf, 0); | |
74f5b7fb | 84 | else if (arg) { |
ce9d823b | 85 | strbuf_addf(buf, "%s%s", buf->len ? "\n\n" : "", arg); |
1c7b76be | 86 | have_message = 1; |
74f5b7fb | 87 | } else |
bacec478 | 88 | return error(_("switch `m' requires a value")); |
1c7b76be MV |
89 | return 0; |
90 | } | |
91 | ||
92 | static struct strategy *get_strategy(const char *name) | |
93 | { | |
94 | int i; | |
87091b49 MV |
95 | struct strategy *ret; |
96 | static struct cmdnames main_cmds, other_cmds; | |
e321180e | 97 | static int loaded; |
1c7b76be MV |
98 | |
99 | if (!name) | |
100 | return NULL; | |
101 | ||
102 | for (i = 0; i < ARRAY_SIZE(all_strategy); i++) | |
103 | if (!strcmp(name, all_strategy[i].name)) | |
104 | return &all_strategy[i]; | |
1719b5e4 | 105 | |
e321180e | 106 | if (!loaded) { |
87091b49 | 107 | struct cmdnames not_strategies; |
e321180e | 108 | loaded = 1; |
87091b49 | 109 | |
87091b49 | 110 | memset(¬_strategies, 0, sizeof(struct cmdnames)); |
e321180e | 111 | load_command_list("git-merge-", &main_cmds, &other_cmds); |
87091b49 MV |
112 | for (i = 0; i < main_cmds.cnt; i++) { |
113 | int j, found = 0; | |
114 | struct cmdname *ent = main_cmds.names[i]; | |
115 | for (j = 0; j < ARRAY_SIZE(all_strategy); j++) | |
116 | if (!strncmp(ent->name, all_strategy[j].name, ent->len) | |
117 | && !all_strategy[j].name[ent->len]) | |
118 | found = 1; | |
119 | if (!found) | |
120 | add_cmdname(¬_strategies, ent->name, ent->len); | |
87091b49 | 121 | } |
ed874656 | 122 | exclude_cmds(&main_cmds, ¬_strategies); |
87091b49 MV |
123 | } |
124 | if (!is_in_cmdlist(&main_cmds, name) && !is_in_cmdlist(&other_cmds, name)) { | |
bacec478 ÆAB |
125 | fprintf(stderr, _("Could not find merge strategy '%s'.\n"), name); |
126 | fprintf(stderr, _("Available strategies are:")); | |
131f9a10 JH |
127 | for (i = 0; i < main_cmds.cnt; i++) |
128 | fprintf(stderr, " %s", main_cmds.names[i]->name); | |
129 | fprintf(stderr, ".\n"); | |
130 | if (other_cmds.cnt) { | |
bacec478 | 131 | fprintf(stderr, _("Available custom strategies are:")); |
131f9a10 JH |
132 | for (i = 0; i < other_cmds.cnt; i++) |
133 | fprintf(stderr, " %s", other_cmds.names[i]->name); | |
134 | fprintf(stderr, ".\n"); | |
135 | } | |
87091b49 MV |
136 | exit(1); |
137 | } | |
138 | ||
19d4b416 | 139 | ret = xcalloc(1, sizeof(struct strategy)); |
87091b49 | 140 | ret->name = xstrdup(name); |
52b48ef1 | 141 | ret->attr = NO_TRIVIAL; |
87091b49 | 142 | return ret; |
1c7b76be MV |
143 | } |
144 | ||
145 | static void append_strategy(struct strategy *s) | |
146 | { | |
147 | ALLOC_GROW(use_strategies, use_strategies_nr + 1, use_strategies_alloc); | |
148 | use_strategies[use_strategies_nr++] = s; | |
149 | } | |
150 | ||
151 | static int option_parse_strategy(const struct option *opt, | |
152 | const char *name, int unset) | |
153 | { | |
1c7b76be MV |
154 | if (unset) |
155 | return 0; | |
156 | ||
1719b5e4 | 157 | append_strategy(get_strategy(name)); |
1c7b76be MV |
158 | return 0; |
159 | } | |
160 | ||
8cc5b290 AP |
161 | static int option_parse_x(const struct option *opt, |
162 | const char *arg, int unset) | |
163 | { | |
164 | if (unset) | |
165 | return 0; | |
166 | ||
167 | ALLOC_GROW(xopts, xopts_nr + 1, xopts_alloc); | |
168 | xopts[xopts_nr++] = xstrdup(arg); | |
169 | return 0; | |
170 | } | |
171 | ||
1c7b76be MV |
172 | static int option_parse_n(const struct option *opt, |
173 | const char *arg, int unset) | |
174 | { | |
175 | show_diffstat = unset; | |
176 | return 0; | |
177 | } | |
178 | ||
179 | static struct option builtin_merge_options[] = { | |
180 | { OPTION_CALLBACK, 'n', NULL, NULL, NULL, | |
181 | "do not show a diffstat at the end of the merge", | |
182 | PARSE_OPT_NOARG, option_parse_n }, | |
183 | OPT_BOOLEAN(0, "stat", &show_diffstat, | |
184 | "show a diffstat at the end of the merge"), | |
185 | OPT_BOOLEAN(0, "summary", &show_diffstat, "(synonym to --stat)"), | |
96e9420c RR |
186 | { OPTION_INTEGER, 0, "log", &shortlog_len, "n", |
187 | "add (at most <n>) entries from shortlog to merge commit message", | |
188 | PARSE_OPT_OPTARG, NULL, DEFAULT_MERGE_LOG_LEN }, | |
1c7b76be MV |
189 | OPT_BOOLEAN(0, "squash", &squash, |
190 | "create a single commit instead of doing a merge"), | |
191 | OPT_BOOLEAN(0, "commit", &option_commit, | |
192 | "perform a commit if the merge succeeds (default)"), | |
193 | OPT_BOOLEAN(0, "ff", &allow_fast_forward, | |
a75d7b54 | 194 | "allow fast-forward (default)"), |
13474835 | 195 | OPT_BOOLEAN(0, "ff-only", &fast_forward_only, |
4d8c3258 | 196 | "abort if fast-forward is not possible"), |
cb6020bb | 197 | OPT_RERERE_AUTOUPDATE(&allow_rerere_auto), |
1c7b76be MV |
198 | OPT_CALLBACK('s', "strategy", &use_strategies, "strategy", |
199 | "merge strategy to use", option_parse_strategy), | |
8cc5b290 AP |
200 | OPT_CALLBACK('X', "strategy-option", &xopts, "option=value", |
201 | "option for selected merge strategy", option_parse_x), | |
23c6a803 | 202 | OPT_CALLBACK('m', "message", &merge_msg, "message", |
3f406175 | 203 | "merge commit message (for a non-fast-forward merge)", |
1c7b76be | 204 | option_parse_message), |
7f87aff2 | 205 | OPT__VERBOSITY(&verbosity), |
35d2fffd JH |
206 | OPT_BOOLEAN(0, "abort", &abort_current_merge, |
207 | "abort the current in-progress merge"), | |
99bfc669 | 208 | OPT_SET_INT(0, "progress", &show_progress, "force progress reporting", 1), |
1c7b76be MV |
209 | OPT_END() |
210 | }; | |
211 | ||
212 | /* Cleans up metadata that is uninteresting after a succeeded merge. */ | |
213 | static void drop_save(void) | |
214 | { | |
215 | unlink(git_path("MERGE_HEAD")); | |
216 | unlink(git_path("MERGE_MSG")); | |
cf10f9fd | 217 | unlink(git_path("MERGE_MODE")); |
1c7b76be MV |
218 | } |
219 | ||
220 | static void save_state(void) | |
221 | { | |
222 | int len; | |
223 | struct child_process cp; | |
224 | struct strbuf buffer = STRBUF_INIT; | |
225 | const char *argv[] = {"stash", "create", NULL}; | |
226 | ||
227 | memset(&cp, 0, sizeof(cp)); | |
228 | cp.argv = argv; | |
229 | cp.out = -1; | |
230 | cp.git_cmd = 1; | |
231 | ||
232 | if (start_command(&cp)) | |
bacec478 | 233 | die(_("could not run stash.")); |
1c7b76be MV |
234 | len = strbuf_read(&buffer, cp.out, 1024); |
235 | close(cp.out); | |
236 | ||
237 | if (finish_command(&cp) || len < 0) | |
bacec478 | 238 | die(_("stash failed")); |
1c7b76be MV |
239 | else if (!len) |
240 | return; | |
241 | strbuf_setlen(&buffer, buffer.len-1); | |
242 | if (get_sha1(buffer.buf, stash)) | |
bacec478 | 243 | die(_("not a valid object: %s"), buffer.buf); |
1c7b76be MV |
244 | } |
245 | ||
172b6428 CB |
246 | static void read_empty(unsigned const char *sha1, int verbose) |
247 | { | |
248 | int i = 0; | |
249 | const char *args[7]; | |
250 | ||
251 | args[i++] = "read-tree"; | |
252 | if (verbose) | |
253 | args[i++] = "-v"; | |
254 | args[i++] = "-m"; | |
255 | args[i++] = "-u"; | |
256 | args[i++] = EMPTY_TREE_SHA1_HEX; | |
257 | args[i++] = sha1_to_hex(sha1); | |
258 | args[i] = NULL; | |
259 | ||
260 | if (run_command_v_opt(args, RUN_GIT_CMD)) | |
bacec478 | 261 | die(_("read-tree failed")); |
172b6428 CB |
262 | } |
263 | ||
1c7b76be MV |
264 | static void reset_hard(unsigned const char *sha1, int verbose) |
265 | { | |
266 | int i = 0; | |
267 | const char *args[6]; | |
268 | ||
269 | args[i++] = "read-tree"; | |
270 | if (verbose) | |
271 | args[i++] = "-v"; | |
272 | args[i++] = "--reset"; | |
273 | args[i++] = "-u"; | |
274 | args[i++] = sha1_to_hex(sha1); | |
275 | args[i] = NULL; | |
276 | ||
277 | if (run_command_v_opt(args, RUN_GIT_CMD)) | |
bacec478 | 278 | die(_("read-tree failed")); |
1c7b76be MV |
279 | } |
280 | ||
281 | static void restore_state(void) | |
282 | { | |
f285a2d7 | 283 | struct strbuf sb = STRBUF_INIT; |
1c7b76be MV |
284 | const char *args[] = { "stash", "apply", NULL, NULL }; |
285 | ||
286 | if (is_null_sha1(stash)) | |
287 | return; | |
288 | ||
289 | reset_hard(head, 1); | |
290 | ||
1c7b76be MV |
291 | args[2] = sha1_to_hex(stash); |
292 | ||
293 | /* | |
294 | * It is OK to ignore error here, for example when there was | |
295 | * nothing to restore. | |
296 | */ | |
297 | run_command_v_opt(args, RUN_GIT_CMD); | |
298 | ||
299 | strbuf_release(&sb); | |
300 | refresh_cache(REFRESH_QUIET); | |
301 | } | |
302 | ||
303 | /* This is called when no merge was necessary. */ | |
304 | static void finish_up_to_date(const char *msg) | |
305 | { | |
7f87aff2 | 306 | if (verbosity >= 0) |
bacec478 | 307 | printf("%s%s\n", squash ? _(" (nothing to squash)") : "", msg); |
1c7b76be MV |
308 | drop_save(); |
309 | } | |
310 | ||
311 | static void squash_message(void) | |
312 | { | |
313 | struct rev_info rev; | |
314 | struct commit *commit; | |
f285a2d7 | 315 | struct strbuf out = STRBUF_INIT; |
1c7b76be MV |
316 | struct commit_list *j; |
317 | int fd; | |
dd2e794a | 318 | struct pretty_print_context ctx = {0}; |
1c7b76be | 319 | |
bacec478 | 320 | printf(_("Squash commit -- not updating HEAD\n")); |
1c7b76be MV |
321 | fd = open(git_path("SQUASH_MSG"), O_WRONLY | O_CREAT, 0666); |
322 | if (fd < 0) | |
bacec478 | 323 | die_errno(_("Could not write to '%s'"), git_path("SQUASH_MSG")); |
1c7b76be MV |
324 | |
325 | init_revisions(&rev, NULL); | |
326 | rev.ignore_merges = 1; | |
327 | rev.commit_format = CMIT_FMT_MEDIUM; | |
328 | ||
329 | commit = lookup_commit(head); | |
330 | commit->object.flags |= UNINTERESTING; | |
331 | add_pending_object(&rev, &commit->object, NULL); | |
332 | ||
333 | for (j = remoteheads; j; j = j->next) | |
334 | add_pending_object(&rev, &j->item->object, NULL); | |
335 | ||
336 | setup_revisions(0, NULL, &rev, NULL); | |
337 | if (prepare_revision_walk(&rev)) | |
bacec478 | 338 | die(_("revision walk setup failed")); |
1c7b76be | 339 | |
dd2e794a TR |
340 | ctx.abbrev = rev.abbrev; |
341 | ctx.date_mode = rev.date_mode; | |
6bf13944 | 342 | ctx.fmt = rev.commit_format; |
dd2e794a | 343 | |
1c7b76be MV |
344 | strbuf_addstr(&out, "Squashed commit of the following:\n"); |
345 | while ((commit = get_revision(&rev)) != NULL) { | |
346 | strbuf_addch(&out, '\n'); | |
347 | strbuf_addf(&out, "commit %s\n", | |
348 | sha1_to_hex(commit->object.sha1)); | |
6bf13944 | 349 | pretty_print_commit(&ctx, commit, &out); |
1c7b76be | 350 | } |
47d32af2 | 351 | if (write(fd, out.buf, out.len) < 0) |
bacec478 | 352 | die_errno(_("Writing SQUASH_MSG")); |
47d32af2 | 353 | if (close(fd)) |
bacec478 | 354 | die_errno(_("Finishing SQUASH_MSG")); |
1c7b76be MV |
355 | strbuf_release(&out); |
356 | } | |
357 | ||
1c7b76be MV |
358 | static void finish(const unsigned char *new_head, const char *msg) |
359 | { | |
f285a2d7 | 360 | struct strbuf reflog_message = STRBUF_INIT; |
1c7b76be | 361 | |
1c7b76be MV |
362 | if (!msg) |
363 | strbuf_addstr(&reflog_message, getenv("GIT_REFLOG_ACTION")); | |
364 | else { | |
7f87aff2 TA |
365 | if (verbosity >= 0) |
366 | printf("%s\n", msg); | |
1c7b76be MV |
367 | strbuf_addf(&reflog_message, "%s: %s", |
368 | getenv("GIT_REFLOG_ACTION"), msg); | |
369 | } | |
370 | if (squash) { | |
371 | squash_message(); | |
372 | } else { | |
7f87aff2 | 373 | if (verbosity >= 0 && !merge_msg.len) |
bacec478 | 374 | printf(_("No merge message -- not updating HEAD\n")); |
1c7b76be MV |
375 | else { |
376 | const char *argv_gc_auto[] = { "gc", "--auto", NULL }; | |
377 | update_ref(reflog_message.buf, "HEAD", | |
378 | new_head, head, 0, | |
379 | DIE_ON_ERR); | |
380 | /* | |
381 | * We ignore errors in 'gc --auto', since the | |
382 | * user should see them. | |
383 | */ | |
384 | run_command_v_opt(argv_gc_auto, RUN_GIT_CMD); | |
385 | } | |
386 | } | |
387 | if (new_head && show_diffstat) { | |
388 | struct diff_options opts; | |
389 | diff_setup(&opts); | |
390 | opts.output_format |= | |
391 | DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT; | |
392 | opts.detect_rename = DIFF_DETECT_RENAME; | |
1c7b76be | 393 | if (diff_setup_done(&opts) < 0) |
bacec478 | 394 | die(_("diff_setup_done failed")); |
1c7b76be MV |
395 | diff_tree_sha1(head, new_head, "", &opts); |
396 | diffcore_std(&opts); | |
397 | diff_flush(&opts); | |
398 | } | |
399 | ||
400 | /* Run a post-merge hook */ | |
ae98a008 | 401 | run_hook(NULL, "post-merge", squash ? "1" : "0", NULL); |
1c7b76be MV |
402 | |
403 | strbuf_release(&reflog_message); | |
404 | } | |
405 | ||
406 | /* Get the name for the merge commit's message. */ | |
407 | static void merge_name(const char *remote, struct strbuf *msg) | |
408 | { | |
409 | struct object *remote_head; | |
410 | unsigned char branch_head[20], buf_sha[20]; | |
f285a2d7 | 411 | struct strbuf buf = STRBUF_INIT; |
c9717ee9 | 412 | struct strbuf bname = STRBUF_INIT; |
1c7b76be | 413 | const char *ptr; |
751c5974 | 414 | char *found_ref; |
1c7b76be MV |
415 | int len, early; |
416 | ||
a552de75 JH |
417 | strbuf_branchname(&bname, remote); |
418 | remote = bname.buf; | |
c9717ee9 | 419 | |
1c7b76be MV |
420 | memset(branch_head, 0, sizeof(branch_head)); |
421 | remote_head = peel_to_type(remote, 0, NULL, OBJ_COMMIT); | |
422 | if (!remote_head) | |
bacec478 | 423 | die(_("'%s' does not point to a commit"), remote); |
1c7b76be | 424 | |
751c5974 JK |
425 | if (dwim_ref(remote, strlen(remote), branch_head, &found_ref) > 0) { |
426 | if (!prefixcmp(found_ref, "refs/heads/")) { | |
427 | strbuf_addf(msg, "%s\t\tbranch '%s' of .\n", | |
428 | sha1_to_hex(branch_head), remote); | |
429 | goto cleanup; | |
430 | } | |
69a8b7c7 | 431 | if (!prefixcmp(found_ref, "refs/remotes/")) { |
13931236 | 432 | strbuf_addf(msg, "%s\t\tremote-tracking branch '%s' of .\n", |
69a8b7c7 JK |
433 | sha1_to_hex(branch_head), remote); |
434 | goto cleanup; | |
435 | } | |
1c7b76be MV |
436 | } |
437 | ||
438 | /* See if remote matches <name>^^^.. or <name>~<number> */ | |
439 | for (len = 0, ptr = remote + strlen(remote); | |
440 | remote < ptr && ptr[-1] == '^'; | |
441 | ptr--) | |
442 | len++; | |
443 | if (len) | |
444 | early = 1; | |
445 | else { | |
446 | early = 0; | |
447 | ptr = strrchr(remote, '~'); | |
448 | if (ptr) { | |
449 | int seen_nonzero = 0; | |
450 | ||
451 | len++; /* count ~ */ | |
452 | while (*++ptr && isdigit(*ptr)) { | |
453 | seen_nonzero |= (*ptr != '0'); | |
454 | len++; | |
455 | } | |
456 | if (*ptr) | |
457 | len = 0; /* not ...~<number> */ | |
458 | else if (seen_nonzero) | |
459 | early = 1; | |
460 | else if (len == 1) | |
461 | early = 1; /* "name~" is "name~1"! */ | |
462 | } | |
463 | } | |
464 | if (len) { | |
465 | struct strbuf truname = STRBUF_INIT; | |
466 | strbuf_addstr(&truname, "refs/heads/"); | |
467 | strbuf_addstr(&truname, remote); | |
9b6bf4d5 | 468 | strbuf_setlen(&truname, truname.len - len); |
b81f925f | 469 | if (resolve_ref(truname.buf, buf_sha, 1, NULL)) { |
1c7b76be MV |
470 | strbuf_addf(msg, |
471 | "%s\t\tbranch '%s'%s of .\n", | |
472 | sha1_to_hex(remote_head->sha1), | |
9b6bf4d5 | 473 | truname.buf + 11, |
1c7b76be | 474 | (early ? " (early part)" : "")); |
c9717ee9 JH |
475 | strbuf_release(&truname); |
476 | goto cleanup; | |
1c7b76be MV |
477 | } |
478 | } | |
479 | ||
480 | if (!strcmp(remote, "FETCH_HEAD") && | |
481 | !access(git_path("FETCH_HEAD"), R_OK)) { | |
482 | FILE *fp; | |
f285a2d7 | 483 | struct strbuf line = STRBUF_INIT; |
1c7b76be MV |
484 | char *ptr; |
485 | ||
1c7b76be MV |
486 | fp = fopen(git_path("FETCH_HEAD"), "r"); |
487 | if (!fp) | |
bacec478 | 488 | die_errno(_("could not open '%s' for reading"), |
d824cbba | 489 | git_path("FETCH_HEAD")); |
1c7b76be MV |
490 | strbuf_getline(&line, fp, '\n'); |
491 | fclose(fp); | |
492 | ptr = strstr(line.buf, "\tnot-for-merge\t"); | |
493 | if (ptr) | |
494 | strbuf_remove(&line, ptr-line.buf+1, 13); | |
495 | strbuf_addbuf(msg, &line); | |
496 | strbuf_release(&line); | |
c9717ee9 | 497 | goto cleanup; |
1c7b76be MV |
498 | } |
499 | strbuf_addf(msg, "%s\t\tcommit '%s'\n", | |
500 | sha1_to_hex(remote_head->sha1), remote); | |
c9717ee9 JH |
501 | cleanup: |
502 | strbuf_release(&buf); | |
503 | strbuf_release(&bname); | |
1c7b76be MV |
504 | } |
505 | ||
0d8fc3ef JH |
506 | static void parse_branch_merge_options(char *bmo) |
507 | { | |
508 | const char **argv; | |
509 | int argc; | |
510 | ||
511 | if (!bmo) | |
512 | return; | |
513 | argc = split_cmdline(bmo, &argv); | |
514 | if (argc < 0) | |
c7fe5b61 JH |
515 | die(_("Bad branch.%s.mergeoptions string: %s"), branch, |
516 | split_cmdline_strerror(argc)); | |
0d8fc3ef JH |
517 | argv = xrealloc(argv, sizeof(*argv) * (argc + 2)); |
518 | memmove(argv + 1, argv, sizeof(*argv) * (argc + 1)); | |
519 | argc++; | |
520 | argv[0] = "branch.*.mergeoptions"; | |
521 | parse_options(argc, argv, NULL, builtin_merge_options, | |
522 | builtin_merge_usage, 0); | |
523 | free(argv); | |
524 | } | |
525 | ||
186458b1 | 526 | static int git_merge_config(const char *k, const char *v, void *cb) |
1c7b76be MV |
527 | { |
528 | if (branch && !prefixcmp(k, "branch.") && | |
529 | !prefixcmp(k + 7, branch) && | |
530 | !strcmp(k + 7 + strlen(branch), ".mergeoptions")) { | |
0d8fc3ef JH |
531 | free(branch_mergeoptions); |
532 | branch_mergeoptions = xstrdup(v); | |
533 | return 0; | |
1c7b76be MV |
534 | } |
535 | ||
536 | if (!strcmp(k, "merge.diffstat") || !strcmp(k, "merge.stat")) | |
537 | show_diffstat = git_config_bool(k, v); | |
538 | else if (!strcmp(k, "pull.twohead")) | |
539 | return git_config_string(&pull_twohead, k, v); | |
540 | else if (!strcmp(k, "pull.octopus")) | |
541 | return git_config_string(&pull_octopus, k, v); | |
7610fa57 JN |
542 | else if (!strcmp(k, "merge.renormalize")) |
543 | option_renormalize = git_config_bool(k, v); | |
96e9420c | 544 | else if (!strcmp(k, "merge.log") || !strcmp(k, "merge.summary")) { |
bda3b8ff RR |
545 | int is_bool; |
546 | shortlog_len = git_config_bool_or_int(k, v, &is_bool); | |
547 | if (!is_bool && shortlog_len < 0) | |
bacec478 | 548 | return error(_("%s: negative length %s"), k, v); |
bda3b8ff RR |
549 | if (is_bool && shortlog_len) |
550 | shortlog_len = DEFAULT_MERGE_LOG_LEN; | |
96e9420c | 551 | return 0; |
f23e8dec JH |
552 | } else if (!strcmp(k, "merge.ff")) { |
553 | int boolval = git_config_maybe_bool(k, v); | |
554 | if (0 <= boolval) { | |
555 | allow_fast_forward = boolval; | |
556 | } else if (v && !strcmp(v, "only")) { | |
557 | allow_fast_forward = 1; | |
558 | fast_forward_only = 1; | |
559 | } /* do not barf on values from future versions of git */ | |
560 | return 0; | |
93e535a5 JH |
561 | } else if (!strcmp(k, "merge.defaulttoupstream")) { |
562 | default_to_upstream = git_config_bool(k, v); | |
563 | return 0; | |
96e9420c | 564 | } |
1c7b76be MV |
565 | return git_diff_ui_config(k, v, cb); |
566 | } | |
567 | ||
568 | static int read_tree_trivial(unsigned char *common, unsigned char *head, | |
569 | unsigned char *one) | |
570 | { | |
571 | int i, nr_trees = 0; | |
572 | struct tree *trees[MAX_UNPACK_TREES]; | |
573 | struct tree_desc t[MAX_UNPACK_TREES]; | |
574 | struct unpack_trees_options opts; | |
575 | ||
576 | memset(&opts, 0, sizeof(opts)); | |
577 | opts.head_idx = 2; | |
578 | opts.src_index = &the_index; | |
579 | opts.dst_index = &the_index; | |
580 | opts.update = 1; | |
581 | opts.verbose_update = 1; | |
582 | opts.trivial_merges_only = 1; | |
583 | opts.merge = 1; | |
584 | trees[nr_trees] = parse_tree_indirect(common); | |
585 | if (!trees[nr_trees++]) | |
586 | return -1; | |
587 | trees[nr_trees] = parse_tree_indirect(head); | |
588 | if (!trees[nr_trees++]) | |
589 | return -1; | |
590 | trees[nr_trees] = parse_tree_indirect(one); | |
591 | if (!trees[nr_trees++]) | |
592 | return -1; | |
593 | opts.fn = threeway_merge; | |
594 | cache_tree_free(&active_cache_tree); | |
595 | for (i = 0; i < nr_trees; i++) { | |
596 | parse_tree(trees[i]); | |
597 | init_tree_desc(t+i, trees[i]->buffer, trees[i]->size); | |
598 | } | |
599 | if (unpack_trees(nr_trees, t, &opts)) | |
600 | return -1; | |
601 | return 0; | |
602 | } | |
603 | ||
604 | static void write_tree_trivial(unsigned char *sha1) | |
605 | { | |
606 | if (write_cache_as_tree(sha1, 0, NULL)) | |
bacec478 | 607 | die(_("git write-tree failed to write a tree")); |
1c7b76be MV |
608 | } |
609 | ||
16180734 JK |
610 | static const char *merge_argument(struct commit *commit) |
611 | { | |
612 | if (commit) | |
613 | return sha1_to_hex(commit->object.sha1); | |
614 | else | |
615 | return EMPTY_TREE_SHA1_HEX; | |
616 | } | |
617 | ||
67ac1e1d JN |
618 | int try_merge_command(const char *strategy, size_t xopts_nr, |
619 | const char **xopts, struct commit_list *common, | |
c674d052 | 620 | const char *head_arg, struct commit_list *remotes) |
1c7b76be MV |
621 | { |
622 | const char **args; | |
8cc5b290 | 623 | int i = 0, x = 0, ret; |
1c7b76be | 624 | struct commit_list *j; |
f285a2d7 | 625 | struct strbuf buf = STRBUF_INIT; |
3f9083cd CC |
626 | |
627 | args = xmalloc((4 + xopts_nr + commit_list_count(common) + | |
628 | commit_list_count(remotes)) * sizeof(char *)); | |
629 | strbuf_addf(&buf, "merge-%s", strategy); | |
630 | args[i++] = buf.buf; | |
631 | for (x = 0; x < xopts_nr; x++) { | |
632 | char *s = xmalloc(strlen(xopts[x])+2+1); | |
633 | strcpy(s, "--"); | |
634 | strcpy(s+2, xopts[x]); | |
635 | args[i++] = s; | |
636 | } | |
637 | for (j = common; j; j = j->next) | |
16180734 | 638 | args[i++] = xstrdup(merge_argument(j->item)); |
3f9083cd CC |
639 | args[i++] = "--"; |
640 | args[i++] = head_arg; | |
641 | for (j = remotes; j; j = j->next) | |
16180734 | 642 | args[i++] = xstrdup(merge_argument(j->item)); |
3f9083cd CC |
643 | args[i] = NULL; |
644 | ret = run_command_v_opt(args, RUN_GIT_CMD); | |
645 | strbuf_release(&buf); | |
646 | i = 1; | |
647 | for (x = 0; x < xopts_nr; x++) | |
648 | free((void *)args[i++]); | |
649 | for (j = common; j; j = j->next) | |
650 | free((void *)args[i++]); | |
651 | i += 2; | |
652 | for (j = remotes; j; j = j->next) | |
653 | free((void *)args[i++]); | |
654 | free(args); | |
655 | discard_cache(); | |
656 | if (read_cache() < 0) | |
bacec478 | 657 | die(_("failed to read the cache")); |
3f9083cd CC |
658 | resolve_undo_clear(); |
659 | ||
660 | return ret; | |
661 | } | |
662 | ||
663 | static int try_merge_strategy(const char *strategy, struct commit_list *common, | |
664 | const char *head_arg) | |
665 | { | |
668f26ff MV |
666 | int index_fd; |
667 | struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); | |
668 | ||
669 | index_fd = hold_locked_index(lock, 1); | |
670 | refresh_cache(REFRESH_QUIET); | |
671 | if (active_cache_changed && | |
672 | (write_cache(index_fd, active_cache, active_nr) || | |
673 | commit_locked_index(lock))) | |
bacec478 | 674 | return error(_("Unable to write index.")); |
668f26ff | 675 | rollback_lock_file(lock); |
1c7b76be | 676 | |
18668f53 | 677 | if (!strcmp(strategy, "recursive") || !strcmp(strategy, "subtree")) { |
3f9083cd | 678 | int clean, x; |
18668f53 MV |
679 | struct commit *result; |
680 | struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); | |
681 | int index_fd; | |
682 | struct commit_list *reversed = NULL; | |
683 | struct merge_options o; | |
3f9083cd | 684 | struct commit_list *j; |
18668f53 MV |
685 | |
686 | if (remoteheads->next) { | |
bacec478 | 687 | error(_("Not handling anything other than two heads merge.")); |
18668f53 MV |
688 | return 2; |
689 | } | |
690 | ||
691 | init_merge_options(&o); | |
692 | if (!strcmp(strategy, "subtree")) | |
85e51b78 | 693 | o.subtree_shift = ""; |
8cc5b290 | 694 | |
7610fa57 | 695 | o.renormalize = option_renormalize; |
99bfc669 JK |
696 | o.show_rename_progress = |
697 | show_progress == -1 ? isatty(2) : show_progress; | |
7610fa57 | 698 | |
635a7bb1 JN |
699 | for (x = 0; x < xopts_nr; x++) |
700 | if (parse_merge_opt(&o, xopts[x])) | |
bacec478 | 701 | die(_("Unknown option for merge-recursive: -X%s"), xopts[x]); |
18668f53 MV |
702 | |
703 | o.branch1 = head_arg; | |
704 | o.branch2 = remoteheads->item->util; | |
705 | ||
706 | for (j = common; j; j = j->next) | |
707 | commit_list_insert(j->item, &reversed); | |
708 | ||
709 | index_fd = hold_locked_index(lock, 1); | |
710 | clean = merge_recursive(&o, lookup_commit(head), | |
711 | remoteheads->item, reversed, &result); | |
712 | if (active_cache_changed && | |
713 | (write_cache(index_fd, active_cache, active_nr) || | |
714 | commit_locked_index(lock))) | |
bacec478 | 715 | die (_("unable to write %s"), get_index_file()); |
42716660 | 716 | rollback_lock_file(lock); |
18668f53 MV |
717 | return clean ? 0 : 1; |
718 | } else { | |
67ac1e1d JN |
719 | return try_merge_command(strategy, xopts_nr, xopts, |
720 | common, head_arg, remoteheads); | |
18668f53 | 721 | } |
1c7b76be MV |
722 | } |
723 | ||
724 | static void count_diff_files(struct diff_queue_struct *q, | |
725 | struct diff_options *opt, void *data) | |
726 | { | |
727 | int *count = data; | |
728 | ||
729 | (*count) += q->nr; | |
730 | } | |
731 | ||
732 | static int count_unmerged_entries(void) | |
733 | { | |
1c7b76be MV |
734 | int i, ret = 0; |
735 | ||
be6ff819 JH |
736 | for (i = 0; i < active_nr; i++) |
737 | if (ce_stage(active_cache[i])) | |
1c7b76be MV |
738 | ret++; |
739 | ||
740 | return ret; | |
741 | } | |
742 | ||
cac42b26 | 743 | int checkout_fast_forward(const unsigned char *head, const unsigned char *remote) |
1c7b76be MV |
744 | { |
745 | struct tree *trees[MAX_UNPACK_TREES]; | |
746 | struct unpack_trees_options opts; | |
747 | struct tree_desc t[MAX_UNPACK_TREES]; | |
748 | int i, fd, nr_trees = 0; | |
749 | struct dir_struct dir; | |
750 | struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file)); | |
751 | ||
9ca8f607 | 752 | refresh_cache(REFRESH_QUIET); |
1c7b76be MV |
753 | |
754 | fd = hold_locked_index(lock_file, 1); | |
755 | ||
756 | memset(&trees, 0, sizeof(trees)); | |
757 | memset(&opts, 0, sizeof(opts)); | |
758 | memset(&t, 0, sizeof(t)); | |
5d2299de | 759 | memset(&dir, 0, sizeof(dir)); |
7c4c97c0 | 760 | dir.flags |= DIR_SHOW_IGNORED; |
1c7b76be MV |
761 | dir.exclude_per_dir = ".gitignore"; |
762 | opts.dir = &dir; | |
763 | ||
764 | opts.head_idx = 1; | |
765 | opts.src_index = &the_index; | |
766 | opts.dst_index = &the_index; | |
767 | opts.update = 1; | |
768 | opts.verbose_update = 1; | |
769 | opts.merge = 1; | |
770 | opts.fn = twoway_merge; | |
e294030f | 771 | setup_unpack_trees_porcelain(&opts, "merge"); |
1c7b76be MV |
772 | |
773 | trees[nr_trees] = parse_tree_indirect(head); | |
774 | if (!trees[nr_trees++]) | |
775 | return -1; | |
776 | trees[nr_trees] = parse_tree_indirect(remote); | |
777 | if (!trees[nr_trees++]) | |
778 | return -1; | |
779 | for (i = 0; i < nr_trees; i++) { | |
780 | parse_tree(trees[i]); | |
781 | init_tree_desc(t+i, trees[i]->buffer, trees[i]->size); | |
782 | } | |
783 | if (unpack_trees(nr_trees, t, &opts)) | |
784 | return -1; | |
785 | if (write_cache(fd, active_cache, active_nr) || | |
786 | commit_locked_index(lock_file)) | |
bacec478 | 787 | die(_("unable to write new index file")); |
1c7b76be MV |
788 | return 0; |
789 | } | |
790 | ||
791 | static void split_merge_strategies(const char *string, struct strategy **list, | |
792 | int *nr, int *alloc) | |
793 | { | |
794 | char *p, *q, *buf; | |
795 | ||
796 | if (!string) | |
797 | return; | |
798 | ||
799 | buf = xstrdup(string); | |
800 | q = buf; | |
801 | for (;;) { | |
802 | p = strchr(q, ' '); | |
803 | if (!p) { | |
804 | ALLOC_GROW(*list, *nr + 1, *alloc); | |
805 | (*list)[(*nr)++].name = xstrdup(q); | |
806 | free(buf); | |
807 | return; | |
808 | } else { | |
809 | *p = '\0'; | |
810 | ALLOC_GROW(*list, *nr + 1, *alloc); | |
811 | (*list)[(*nr)++].name = xstrdup(q); | |
812 | q = ++p; | |
813 | } | |
814 | } | |
815 | } | |
816 | ||
817 | static void add_strategies(const char *string, unsigned attr) | |
818 | { | |
819 | struct strategy *list = NULL; | |
820 | int list_alloc = 0, list_nr = 0, i; | |
821 | ||
822 | memset(&list, 0, sizeof(list)); | |
823 | split_merge_strategies(string, &list, &list_nr, &list_alloc); | |
1719b5e4 MV |
824 | if (list) { |
825 | for (i = 0; i < list_nr; i++) | |
826 | append_strategy(get_strategy(list[i].name)); | |
1c7b76be MV |
827 | return; |
828 | } | |
829 | for (i = 0; i < ARRAY_SIZE(all_strategy); i++) | |
830 | if (all_strategy[i].attr & attr) | |
831 | append_strategy(&all_strategy[i]); | |
832 | ||
833 | } | |
834 | ||
65969d43 JS |
835 | static void write_merge_msg(void) |
836 | { | |
837 | int fd = open(git_path("MERGE_MSG"), O_WRONLY | O_CREAT, 0666); | |
838 | if (fd < 0) | |
6c80cd29 | 839 | die_errno(_("Could not open '%s' for writing"), |
65969d43 JS |
840 | git_path("MERGE_MSG")); |
841 | if (write_in_full(fd, merge_msg.buf, merge_msg.len) != merge_msg.len) | |
6c80cd29 | 842 | die_errno(_("Could not write to '%s'"), git_path("MERGE_MSG")); |
65969d43 JS |
843 | close(fd); |
844 | } | |
845 | ||
846 | static void read_merge_msg(void) | |
847 | { | |
848 | strbuf_reset(&merge_msg); | |
849 | if (strbuf_read_file(&merge_msg, git_path("MERGE_MSG"), 0) < 0) | |
650ed9db | 850 | die_errno(_("Could not read from '%s'"), git_path("MERGE_MSG")); |
65969d43 JS |
851 | } |
852 | ||
853 | static void run_prepare_commit_msg(void) | |
854 | { | |
855 | write_merge_msg(); | |
856 | run_hook(get_index_file(), "prepare-commit-msg", | |
857 | git_path("MERGE_MSG"), "merge", NULL, NULL); | |
858 | read_merge_msg(); | |
859 | } | |
860 | ||
1c7b76be MV |
861 | static int merge_trivial(void) |
862 | { | |
863 | unsigned char result_tree[20], result_commit[20]; | |
36e40535 | 864 | struct commit_list *parent = xmalloc(sizeof(*parent)); |
1c7b76be MV |
865 | |
866 | write_tree_trivial(result_tree); | |
157efde1 | 867 | printf(_("Wonderful.\n")); |
446247db | 868 | parent->item = lookup_commit(head); |
36e40535 | 869 | parent->next = xmalloc(sizeof(*parent->next)); |
446247db JH |
870 | parent->next->item = remoteheads->item; |
871 | parent->next->next = NULL; | |
65969d43 | 872 | run_prepare_commit_msg(); |
ee20a129 | 873 | commit_tree(merge_msg.buf, result_tree, parent, result_commit, NULL); |
1c7b76be MV |
874 | finish(result_commit, "In-index merge"); |
875 | drop_save(); | |
876 | return 0; | |
877 | } | |
878 | ||
879 | static int finish_automerge(struct commit_list *common, | |
880 | unsigned char *result_tree, | |
881 | const char *wt_strategy) | |
882 | { | |
883 | struct commit_list *parents = NULL, *j; | |
884 | struct strbuf buf = STRBUF_INIT; | |
885 | unsigned char result_commit[20]; | |
886 | ||
887 | free_commit_list(common); | |
888 | if (allow_fast_forward) { | |
889 | parents = remoteheads; | |
890 | commit_list_insert(lookup_commit(head), &parents); | |
891 | parents = reduce_heads(parents); | |
892 | } else { | |
893 | struct commit_list **pptr = &parents; | |
894 | ||
895 | pptr = &commit_list_insert(lookup_commit(head), | |
896 | pptr)->next; | |
897 | for (j = remoteheads; j; j = j->next) | |
898 | pptr = &commit_list_insert(j->item, pptr)->next; | |
899 | } | |
900 | free_commit_list(remoteheads); | |
901 | strbuf_addch(&merge_msg, '\n'); | |
65969d43 | 902 | run_prepare_commit_msg(); |
ee20a129 | 903 | commit_tree(merge_msg.buf, result_tree, parents, result_commit, NULL); |
f23101bf | 904 | strbuf_addf(&buf, "Merge made by the '%s' strategy.", wt_strategy); |
1c7b76be MV |
905 | finish(result_commit, buf.buf); |
906 | strbuf_release(&buf); | |
907 | drop_save(); | |
908 | return 0; | |
909 | } | |
910 | ||
7610fa57 | 911 | static int suggest_conflicts(int renormalizing) |
1c7b76be MV |
912 | { |
913 | FILE *fp; | |
914 | int pos; | |
915 | ||
916 | fp = fopen(git_path("MERGE_MSG"), "a"); | |
917 | if (!fp) | |
bacec478 | 918 | die_errno(_("Could not open '%s' for writing"), |
0721c314 | 919 | git_path("MERGE_MSG")); |
1c7b76be MV |
920 | fprintf(fp, "\nConflicts:\n"); |
921 | for (pos = 0; pos < active_nr; pos++) { | |
922 | struct cache_entry *ce = active_cache[pos]; | |
923 | ||
924 | if (ce_stage(ce)) { | |
925 | fprintf(fp, "\t%s\n", ce->name); | |
926 | while (pos + 1 < active_nr && | |
927 | !strcmp(ce->name, | |
928 | active_cache[pos + 1]->name)) | |
929 | pos++; | |
930 | } | |
931 | } | |
932 | fclose(fp); | |
cb6020bb | 933 | rerere(allow_rerere_auto); |
bacec478 ÆAB |
934 | printf(_("Automatic merge failed; " |
935 | "fix conflicts and then commit the result.\n")); | |
1c7b76be MV |
936 | return 1; |
937 | } | |
938 | ||
939 | static struct commit *is_old_style_invocation(int argc, const char **argv) | |
940 | { | |
941 | struct commit *second_token = NULL; | |
76bf488e | 942 | if (argc > 2) { |
1c7b76be MV |
943 | unsigned char second_sha1[20]; |
944 | ||
945 | if (get_sha1(argv[1], second_sha1)) | |
946 | return NULL; | |
947 | second_token = lookup_commit_reference_gently(second_sha1, 0); | |
948 | if (!second_token) | |
bacec478 | 949 | die(_("'%s' is not a commit"), argv[1]); |
1c7b76be MV |
950 | if (hashcmp(second_token->object.sha1, head)) |
951 | return NULL; | |
952 | } | |
953 | return second_token; | |
954 | } | |
955 | ||
956 | static int evaluate_result(void) | |
957 | { | |
958 | int cnt = 0; | |
959 | struct rev_info rev; | |
960 | ||
1c7b76be MV |
961 | /* Check how many files differ. */ |
962 | init_revisions(&rev, ""); | |
963 | setup_revisions(0, NULL, &rev, NULL); | |
964 | rev.diffopt.output_format |= | |
965 | DIFF_FORMAT_CALLBACK; | |
966 | rev.diffopt.format_callback = count_diff_files; | |
967 | rev.diffopt.format_callback_data = &cnt; | |
968 | run_diff_files(&rev, 0); | |
969 | ||
970 | /* | |
971 | * Check how many unmerged entries are | |
972 | * there. | |
973 | */ | |
974 | cnt += count_unmerged_entries(); | |
975 | ||
976 | return cnt; | |
977 | } | |
978 | ||
93e535a5 JH |
979 | /* |
980 | * Pretend as if the user told us to merge with the tracking | |
981 | * branch we have for the upstream of the current branch | |
982 | */ | |
983 | static int setup_with_upstream(const char ***argv) | |
984 | { | |
985 | struct branch *branch = branch_get(NULL); | |
986 | int i; | |
987 | const char **args; | |
988 | ||
989 | if (!branch) | |
c7f426d4 | 990 | die(_("No current branch.")); |
93e535a5 | 991 | if (!branch->remote) |
c7f426d4 | 992 | die(_("No remote for the current branch.")); |
93e535a5 | 993 | if (!branch->merge_nr) |
c7f426d4 | 994 | die(_("No default upstream defined for the current branch.")); |
93e535a5 JH |
995 | |
996 | args = xcalloc(branch->merge_nr + 1, sizeof(char *)); | |
997 | for (i = 0; i < branch->merge_nr; i++) { | |
998 | if (!branch->merge[i]->dst) | |
c7f426d4 | 999 | die(_("No remote tracking branch for %s from %s"), |
93e535a5 JH |
1000 | branch->merge[i]->src, branch->remote_name); |
1001 | args[i] = branch->merge[i]->dst; | |
1002 | } | |
1003 | args[i] = NULL; | |
1004 | *argv = args; | |
1005 | return i; | |
1006 | } | |
1007 | ||
1c7b76be MV |
1008 | int cmd_merge(int argc, const char **argv, const char *prefix) |
1009 | { | |
1010 | unsigned char result_tree[20]; | |
f285a2d7 | 1011 | struct strbuf buf = STRBUF_INIT; |
1c7b76be MV |
1012 | const char *head_arg; |
1013 | int flag, head_invalid = 0, i; | |
1014 | int best_cnt = -1, merge_was_ok = 0, automerge_was_ok = 0; | |
1015 | struct commit_list *common = NULL; | |
1016 | const char *best_strategy = NULL, *wt_strategy = NULL; | |
1017 | struct commit_list **remotes = &remoteheads; | |
1018 | ||
da53eec6 NTND |
1019 | if (argc == 2 && !strcmp(argv[1], "-h")) |
1020 | usage_with_options(builtin_merge_usage, builtin_merge_options); | |
1c7b76be MV |
1021 | |
1022 | /* | |
1023 | * Check if we are _not_ on a detached HEAD, i.e. if there is a | |
1024 | * current branch. | |
1025 | */ | |
1026 | branch = resolve_ref("HEAD", head, 0, &flag); | |
1027 | if (branch && !prefixcmp(branch, "refs/heads/")) | |
1028 | branch += 11; | |
1029 | if (is_null_sha1(head)) | |
1030 | head_invalid = 1; | |
1031 | ||
1032 | git_config(git_merge_config, NULL); | |
1033 | ||
0d8fc3ef JH |
1034 | if (branch_mergeoptions) |
1035 | parse_branch_merge_options(branch_mergeoptions); | |
37782920 | 1036 | argc = parse_options(argc, argv, prefix, builtin_merge_options, |
1c7b76be | 1037 | builtin_merge_usage, 0); |
2a22c1b3 | 1038 | |
99bfc669 JK |
1039 | if (verbosity < 0 && show_progress == -1) |
1040 | show_progress = 0; | |
1041 | ||
35d2fffd JH |
1042 | if (abort_current_merge) { |
1043 | int nargc = 2; | |
1044 | const char *nargv[] = {"reset", "--merge", NULL}; | |
1045 | ||
1046 | if (!file_exists(git_path("MERGE_HEAD"))) | |
bacec478 | 1047 | die(_("There is no merge to abort (MERGE_HEAD missing).")); |
35d2fffd JH |
1048 | |
1049 | /* Invoke 'git reset --merge' */ | |
1050 | return cmd_reset(nargc, nargv, prefix); | |
1051 | } | |
1052 | ||
2a22c1b3 JH |
1053 | if (read_cache_unmerged()) |
1054 | die_resolve_conflict("merge"); | |
1055 | ||
1056 | if (file_exists(git_path("MERGE_HEAD"))) { | |
1057 | /* | |
1058 | * There is no unmerged entry, don't advise 'git | |
1059 | * add/rm <file>', just 'git commit'. | |
1060 | */ | |
1061 | if (advice_resolve_conflict) | |
bacec478 ÆAB |
1062 | die(_("You have not concluded your merge (MERGE_HEAD exists).\n" |
1063 | "Please, commit your changes before you can merge.")); | |
2a22c1b3 | 1064 | else |
bacec478 | 1065 | die(_("You have not concluded your merge (MERGE_HEAD exists).")); |
2a22c1b3 | 1066 | } |
d7e5c0cb JS |
1067 | if (file_exists(git_path("CHERRY_PICK_HEAD"))) { |
1068 | if (advice_resolve_conflict) | |
f68f1801 ÆAB |
1069 | die(_("You have not concluded your cherry-pick (CHERRY_PICK_HEAD exists).\n" |
1070 | "Please, commit your changes before you can merge.")); | |
d7e5c0cb | 1071 | else |
f68f1801 | 1072 | die(_("You have not concluded your cherry-pick (CHERRY_PICK_HEAD exists).")); |
2a22c1b3 JH |
1073 | } |
1074 | resolve_undo_clear(); | |
1075 | ||
7f87aff2 TA |
1076 | if (verbosity < 0) |
1077 | show_diffstat = 0; | |
1c7b76be MV |
1078 | |
1079 | if (squash) { | |
1080 | if (!allow_fast_forward) | |
bacec478 | 1081 | die(_("You cannot combine --squash with --no-ff.")); |
1c7b76be MV |
1082 | option_commit = 0; |
1083 | } | |
1084 | ||
13474835 | 1085 | if (!allow_fast_forward && fast_forward_only) |
bacec478 | 1086 | die(_("You cannot combine --no-ff with --ff-only.")); |
13474835 | 1087 | |
4e8115ff JH |
1088 | if (!abort_current_merge) { |
1089 | if (!argc && default_to_upstream) | |
1090 | argc = setup_with_upstream(&argv); | |
1091 | else if (argc == 1 && !strcmp(argv[0], "-")) | |
1092 | argv[0] = "@{-1}"; | |
1093 | } | |
1c7b76be MV |
1094 | if (!argc) |
1095 | usage_with_options(builtin_merge_usage, | |
1096 | builtin_merge_options); | |
1097 | ||
1098 | /* | |
1099 | * This could be traditional "merge <msg> HEAD <commit>..." and | |
1100 | * the way we can tell it is to see if the second token is HEAD, | |
1101 | * but some people might have misused the interface and used a | |
1102 | * committish that is the same as HEAD there instead. | |
1103 | * Traditional format never would have "-m" so it is an | |
1104 | * additional safety measure to check for it. | |
1105 | */ | |
1c7b76be MV |
1106 | |
1107 | if (!have_message && is_old_style_invocation(argc, argv)) { | |
1108 | strbuf_addstr(&merge_msg, argv[0]); | |
1109 | head_arg = argv[1]; | |
1110 | argv += 2; | |
1111 | argc -= 2; | |
1112 | } else if (head_invalid) { | |
1113 | struct object *remote_head; | |
1114 | /* | |
1115 | * If the merged head is a valid one there is no reason | |
1116 | * to forbid "git merge" into a branch yet to be born. | |
1117 | * We do the same for "git pull". | |
1118 | */ | |
1119 | if (argc != 1) | |
bacec478 ÆAB |
1120 | die(_("Can merge only exactly one commit into " |
1121 | "empty head")); | |
4be636f4 | 1122 | if (squash) |
bacec478 | 1123 | die(_("Squash commit into empty head not supported yet")); |
4be636f4 | 1124 | if (!allow_fast_forward) |
bacec478 ÆAB |
1125 | die(_("Non-fast-forward commit does not make sense into " |
1126 | "an empty head")); | |
1c7b76be MV |
1127 | remote_head = peel_to_type(argv[0], 0, NULL, OBJ_COMMIT); |
1128 | if (!remote_head) | |
bacec478 | 1129 | die(_("%s - not something we can merge"), argv[0]); |
97b1b4f3 | 1130 | read_empty(remote_head->sha1, 0); |
1c7b76be MV |
1131 | update_ref("initial pull", "HEAD", remote_head->sha1, NULL, 0, |
1132 | DIE_ON_ERR); | |
1c7b76be MV |
1133 | return 0; |
1134 | } else { | |
97d45bcb | 1135 | struct strbuf merge_names = STRBUF_INIT; |
1c7b76be MV |
1136 | |
1137 | /* We are invoked directly as the first-class UI. */ | |
1138 | head_arg = "HEAD"; | |
1139 | ||
1140 | /* | |
1141 | * All the rest are the commits being merged; | |
1142 | * prepare the standard merge summary message to | |
1143 | * be appended to the given message. If remote | |
1144 | * is invalid we will die later in the common | |
1145 | * codepath so we discard the error in this | |
1146 | * loop. | |
1147 | */ | |
f0ecac2b TRC |
1148 | for (i = 0; i < argc; i++) |
1149 | merge_name(argv[i], &merge_names); | |
1150 | ||
96e9420c | 1151 | if (!have_message || shortlog_len) { |
1876166a | 1152 | fmt_merge_msg(&merge_names, &merge_msg, !have_message, |
96e9420c | 1153 | shortlog_len); |
1876166a RR |
1154 | if (merge_msg.len) |
1155 | strbuf_setlen(&merge_msg, merge_msg.len - 1); | |
1156 | } | |
1c7b76be MV |
1157 | } |
1158 | ||
1159 | if (head_invalid || !argc) | |
1160 | usage_with_options(builtin_merge_usage, | |
1161 | builtin_merge_options); | |
1162 | ||
1163 | strbuf_addstr(&buf, "merge"); | |
1164 | for (i = 0; i < argc; i++) | |
1165 | strbuf_addf(&buf, " %s", argv[i]); | |
1166 | setenv("GIT_REFLOG_ACTION", buf.buf, 0); | |
1167 | strbuf_reset(&buf); | |
1168 | ||
1169 | for (i = 0; i < argc; i++) { | |
1170 | struct object *o; | |
18668f53 | 1171 | struct commit *commit; |
1c7b76be MV |
1172 | |
1173 | o = peel_to_type(argv[i], 0, NULL, OBJ_COMMIT); | |
1174 | if (!o) | |
bacec478 | 1175 | die(_("%s - not something we can merge"), argv[i]); |
18668f53 MV |
1176 | commit = lookup_commit(o->sha1); |
1177 | commit->util = (void *)argv[i]; | |
1178 | remotes = &commit_list_insert(commit, remotes)->next; | |
1c7b76be MV |
1179 | |
1180 | strbuf_addf(&buf, "GITHEAD_%s", sha1_to_hex(o->sha1)); | |
1181 | setenv(buf.buf, argv[i], 1); | |
1182 | strbuf_reset(&buf); | |
1183 | } | |
1184 | ||
1185 | if (!use_strategies) { | |
1186 | if (!remoteheads->next) | |
1187 | add_strategies(pull_twohead, DEFAULT_TWOHEAD); | |
1188 | else | |
1189 | add_strategies(pull_octopus, DEFAULT_OCTOPUS); | |
1190 | } | |
1191 | ||
1192 | for (i = 0; i < use_strategies_nr; i++) { | |
1193 | if (use_strategies[i]->attr & NO_FAST_FORWARD) | |
1194 | allow_fast_forward = 0; | |
1195 | if (use_strategies[i]->attr & NO_TRIVIAL) | |
1196 | allow_trivial = 0; | |
1197 | } | |
1198 | ||
1199 | if (!remoteheads->next) | |
1200 | common = get_merge_bases(lookup_commit(head), | |
1201 | remoteheads->item, 1); | |
1202 | else { | |
1203 | struct commit_list *list = remoteheads; | |
1204 | commit_list_insert(lookup_commit(head), &list); | |
1205 | common = get_octopus_merge_bases(list); | |
1206 | free(list); | |
1207 | } | |
1208 | ||
1209 | update_ref("updating ORIG_HEAD", "ORIG_HEAD", head, NULL, 0, | |
1210 | DIE_ON_ERR); | |
1211 | ||
1212 | if (!common) | |
1213 | ; /* No common ancestors found. We need a real merge. */ | |
1214 | else if (!remoteheads->next && !common->next && | |
1215 | common->item == remoteheads->item) { | |
1216 | /* | |
1217 | * If head can reach all the merge then we are up to date. | |
1218 | * but first the most common case of merging one remote. | |
1219 | */ | |
1220 | finish_up_to_date("Already up-to-date."); | |
1221 | return 0; | |
1222 | } else if (allow_fast_forward && !remoteheads->next && | |
1223 | !common->next && | |
1224 | !hashcmp(common->item->object.sha1, head)) { | |
1225 | /* Again the most common case of merging one remote. */ | |
f285a2d7 | 1226 | struct strbuf msg = STRBUF_INIT; |
1c7b76be MV |
1227 | struct object *o; |
1228 | char hex[41]; | |
1229 | ||
1230 | strcpy(hex, find_unique_abbrev(head, DEFAULT_ABBREV)); | |
1231 | ||
7f87aff2 | 1232 | if (verbosity >= 0) |
2ceb61e0 | 1233 | printf(_("Updating %s..%s\n"), |
7f87aff2 TA |
1234 | hex, |
1235 | find_unique_abbrev(remoteheads->item->object.sha1, | |
1236 | DEFAULT_ABBREV)); | |
a75d7b54 | 1237 | strbuf_addstr(&msg, "Fast-forward"); |
1c7b76be MV |
1238 | if (have_message) |
1239 | strbuf_addstr(&msg, | |
1240 | " (no commit created; -m option ignored)"); | |
1241 | o = peel_to_type(sha1_to_hex(remoteheads->item->object.sha1), | |
1242 | 0, NULL, OBJ_COMMIT); | |
1243 | if (!o) | |
1244 | return 1; | |
1245 | ||
1246 | if (checkout_fast_forward(head, remoteheads->item->object.sha1)) | |
1247 | return 1; | |
1248 | ||
1249 | finish(o->sha1, msg.buf); | |
1250 | drop_save(); | |
1251 | return 0; | |
1252 | } else if (!remoteheads->next && common->next) | |
1253 | ; | |
1254 | /* | |
a75d7b54 | 1255 | * We are not doing octopus and not fast-forward. Need |
1c7b76be MV |
1256 | * a real merge. |
1257 | */ | |
1258 | else if (!remoteheads->next && !common->next && option_commit) { | |
1259 | /* | |
a75d7b54 | 1260 | * We are not doing octopus, not fast-forward, and have |
1c7b76be MV |
1261 | * only one common. |
1262 | */ | |
1263 | refresh_cache(REFRESH_QUIET); | |
13474835 | 1264 | if (allow_trivial && !fast_forward_only) { |
1c7b76be MV |
1265 | /* See if it is really trivial. */ |
1266 | git_committer_info(IDENT_ERROR_ON_NO_NAME); | |
bacec478 | 1267 | printf(_("Trying really trivial in-index merge...\n")); |
1c7b76be MV |
1268 | if (!read_tree_trivial(common->item->object.sha1, |
1269 | head, remoteheads->item->object.sha1)) | |
1270 | return merge_trivial(); | |
bacec478 | 1271 | printf(_("Nope.\n")); |
1c7b76be MV |
1272 | } |
1273 | } else { | |
1274 | /* | |
1275 | * An octopus. If we can reach all the remote we are up | |
1276 | * to date. | |
1277 | */ | |
1278 | int up_to_date = 1; | |
1279 | struct commit_list *j; | |
1280 | ||
1281 | for (j = remoteheads; j; j = j->next) { | |
1282 | struct commit_list *common_one; | |
1283 | ||
1284 | /* | |
1285 | * Here we *have* to calculate the individual | |
1286 | * merge_bases again, otherwise "git merge HEAD^ | |
1287 | * HEAD^^" would be missed. | |
1288 | */ | |
1289 | common_one = get_merge_bases(lookup_commit(head), | |
1290 | j->item, 1); | |
1291 | if (hashcmp(common_one->item->object.sha1, | |
1292 | j->item->object.sha1)) { | |
1293 | up_to_date = 0; | |
1294 | break; | |
1295 | } | |
1296 | } | |
1297 | if (up_to_date) { | |
1298 | finish_up_to_date("Already up-to-date. Yeeah!"); | |
1299 | return 0; | |
1300 | } | |
1301 | } | |
1302 | ||
13474835 | 1303 | if (fast_forward_only) |
bacec478 | 1304 | die(_("Not possible to fast-forward, aborting.")); |
13474835 | 1305 | |
1c7b76be MV |
1306 | /* We are going to make a new commit. */ |
1307 | git_committer_info(IDENT_ERROR_ON_NO_NAME); | |
1308 | ||
1309 | /* | |
1310 | * At this point, we need a real merge. No matter what strategy | |
1311 | * we use, it would operate on the index, possibly affecting the | |
1312 | * working tree, and when resolved cleanly, have the desired | |
1313 | * tree in the index -- this means that the index must be in | |
1314 | * sync with the head commit. The strategies are responsible | |
1315 | * to ensure this. | |
1316 | */ | |
1317 | if (use_strategies_nr != 1) { | |
1318 | /* | |
1319 | * Stash away the local changes so that we can try more | |
1320 | * than one. | |
1321 | */ | |
1322 | save_state(); | |
1323 | } else { | |
1324 | memcpy(stash, null_sha1, 20); | |
1325 | } | |
1326 | ||
1327 | for (i = 0; i < use_strategies_nr; i++) { | |
1328 | int ret; | |
1329 | if (i) { | |
bacec478 | 1330 | printf(_("Rewinding the tree to pristine...\n")); |
1c7b76be MV |
1331 | restore_state(); |
1332 | } | |
1333 | if (use_strategies_nr != 1) | |
bacec478 | 1334 | printf(_("Trying merge strategy %s...\n"), |
1c7b76be MV |
1335 | use_strategies[i]->name); |
1336 | /* | |
1337 | * Remember which strategy left the state in the working | |
1338 | * tree. | |
1339 | */ | |
1340 | wt_strategy = use_strategies[i]->name; | |
1341 | ||
1342 | ret = try_merge_strategy(use_strategies[i]->name, | |
1343 | common, head_arg); | |
1344 | if (!option_commit && !ret) { | |
1345 | merge_was_ok = 1; | |
1346 | /* | |
1347 | * This is necessary here just to avoid writing | |
1348 | * the tree, but later we will *not* exit with | |
1349 | * status code 1 because merge_was_ok is set. | |
1350 | */ | |
1351 | ret = 1; | |
1352 | } | |
1353 | ||
1354 | if (ret) { | |
1355 | /* | |
1356 | * The backend exits with 1 when conflicts are | |
1357 | * left to be resolved, with 2 when it does not | |
1358 | * handle the given merge at all. | |
1359 | */ | |
1360 | if (ret == 1) { | |
1361 | int cnt = evaluate_result(); | |
1362 | ||
1363 | if (best_cnt <= 0 || cnt <= best_cnt) { | |
1364 | best_strategy = use_strategies[i]->name; | |
1365 | best_cnt = cnt; | |
1366 | } | |
1367 | } | |
1368 | if (merge_was_ok) | |
1369 | break; | |
1370 | else | |
1371 | continue; | |
1372 | } | |
1373 | ||
1374 | /* Automerge succeeded. */ | |
1375 | write_tree_trivial(result_tree); | |
1376 | automerge_was_ok = 1; | |
1377 | break; | |
1378 | } | |
1379 | ||
1380 | /* | |
1381 | * If we have a resulting tree, that means the strategy module | |
1382 | * auto resolved the merge cleanly. | |
1383 | */ | |
1384 | if (automerge_was_ok) | |
1385 | return finish_automerge(common, result_tree, wt_strategy); | |
1386 | ||
1387 | /* | |
1388 | * Pick the result from the best strategy and have the user fix | |
1389 | * it up. | |
1390 | */ | |
1391 | if (!best_strategy) { | |
1392 | restore_state(); | |
1393 | if (use_strategies_nr > 1) | |
1394 | fprintf(stderr, | |
bacec478 | 1395 | _("No merge strategy handled the merge.\n")); |
1c7b76be | 1396 | else |
bacec478 | 1397 | fprintf(stderr, _("Merge with strategy %s failed.\n"), |
1c7b76be MV |
1398 | use_strategies[0]->name); |
1399 | return 2; | |
1400 | } else if (best_strategy == wt_strategy) | |
1401 | ; /* We already have its result in the working tree. */ | |
1402 | else { | |
bacec478 | 1403 | printf(_("Rewinding the tree to pristine...\n")); |
1c7b76be | 1404 | restore_state(); |
bacec478 | 1405 | printf(_("Using the %s to prepare resolving by hand.\n"), |
1c7b76be MV |
1406 | best_strategy); |
1407 | try_merge_strategy(best_strategy, common, head_arg); | |
1408 | } | |
1409 | ||
1410 | if (squash) | |
1411 | finish(NULL, NULL); | |
1412 | else { | |
1413 | int fd; | |
1414 | struct commit_list *j; | |
1415 | ||
1416 | for (j = remoteheads; j; j = j->next) | |
1417 | strbuf_addf(&buf, "%s\n", | |
1418 | sha1_to_hex(j->item->object.sha1)); | |
1419 | fd = open(git_path("MERGE_HEAD"), O_WRONLY | O_CREAT, 0666); | |
1420 | if (fd < 0) | |
bacec478 | 1421 | die_errno(_("Could not open '%s' for writing"), |
0721c314 | 1422 | git_path("MERGE_HEAD")); |
1c7b76be | 1423 | if (write_in_full(fd, buf.buf, buf.len) != buf.len) |
bacec478 | 1424 | die_errno(_("Could not write to '%s'"), git_path("MERGE_HEAD")); |
1c7b76be MV |
1425 | close(fd); |
1426 | strbuf_addch(&merge_msg, '\n'); | |
65969d43 | 1427 | write_merge_msg(); |
cf10f9fd MV |
1428 | fd = open(git_path("MERGE_MODE"), O_WRONLY | O_CREAT | O_TRUNC, 0666); |
1429 | if (fd < 0) | |
bacec478 | 1430 | die_errno(_("Could not open '%s' for writing"), |
0721c314 | 1431 | git_path("MERGE_MODE")); |
cf10f9fd MV |
1432 | strbuf_reset(&buf); |
1433 | if (!allow_fast_forward) | |
1434 | strbuf_addf(&buf, "no-ff"); | |
1435 | if (write_in_full(fd, buf.buf, buf.len) != buf.len) | |
bacec478 | 1436 | die_errno(_("Could not write to '%s'"), git_path("MERGE_MODE")); |
cf10f9fd | 1437 | close(fd); |
1c7b76be MV |
1438 | } |
1439 | ||
1440 | if (merge_was_ok) { | |
bacec478 ÆAB |
1441 | fprintf(stderr, _("Automatic merge went well; " |
1442 | "stopped before committing as requested\n")); | |
1c7b76be MV |
1443 | return 0; |
1444 | } else | |
7610fa57 | 1445 | return suggest_conflicts(option_renormalize); |
1c7b76be | 1446 | } |