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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 | ||
f8adbec9 | 9 | #define USE_THE_INDEX_COMPATIBILITY_MACROS |
1c7b76be | 10 | #include "cache.h" |
b2141fc1 | 11 | #include "config.h" |
1c7b76be MV |
12 | #include "parse-options.h" |
13 | #include "builtin.h" | |
697cc8ef | 14 | #include "lockfile.h" |
1c7b76be MV |
15 | #include "run-command.h" |
16 | #include "diff.h" | |
17 | #include "refs.h" | |
ec0cb496 | 18 | #include "refspec.h" |
1c7b76be MV |
19 | #include "commit.h" |
20 | #include "diffcore.h" | |
21 | #include "revision.h" | |
22 | #include "unpack-trees.h" | |
23 | #include "cache-tree.h" | |
24 | #include "dir.h" | |
25 | #include "utf8.h" | |
26 | #include "log-tree.h" | |
27 | #include "color.h" | |
fcab40a3 | 28 | #include "rerere.h" |
87091b49 | 29 | #include "help.h" |
18668f53 | 30 | #include "merge-recursive.h" |
cfc5789a | 31 | #include "resolve-undo.h" |
93e535a5 | 32 | #include "remote.h" |
898eacd8 | 33 | #include "fmt-merge-msg.h" |
ba3c69a9 | 34 | #include "gpg-interface.h" |
75c961b7 | 35 | #include "sequencer.h" |
02a8cfa4 | 36 | #include "string-list.h" |
3836d88a | 37 | #include "packfile.h" |
adcc94a0 | 38 | #include "tag.h" |
65b5f948 | 39 | #include "alias.h" |
64043556 | 40 | #include "commit-reach.h" |
1c7b76be MV |
41 | |
42 | #define DEFAULT_TWOHEAD (1<<0) | |
43 | #define DEFAULT_OCTOPUS (1<<1) | |
44 | #define NO_FAST_FORWARD (1<<2) | |
45 | #define NO_TRIVIAL (1<<3) | |
46 | ||
47 | struct strategy { | |
48 | const char *name; | |
49 | unsigned attr; | |
50 | }; | |
51 | ||
52 | static const char * const builtin_merge_usage[] = { | |
9c9b4f2f | 53 | N_("git merge [<options>] [<commit>...]"), |
962e6295 | 54 | N_("git merge --abort"), |
367ff694 | 55 | N_("git merge --continue"), |
1c7b76be MV |
56 | NULL |
57 | }; | |
58 | ||
898eacd8 | 59 | static int show_diffstat = 1, shortlog_len = -1, squash; |
a54841e9 MV |
60 | static int option_commit = 1; |
61 | static int option_edit = -1; | |
efed0022 | 62 | static int allow_trivial = 1, have_message, verify_signatures; |
c1d7036b | 63 | static int overwrite_ignore = 1; |
2c47789d | 64 | static struct strbuf merge_msg = STRBUF_INIT; |
1c7b76be MV |
65 | static struct strategy **use_strategies; |
66 | static size_t use_strategies_nr, use_strategies_alloc; | |
8cc5b290 AP |
67 | static const char **xopts; |
68 | static size_t xopts_nr, xopts_alloc; | |
1c7b76be | 69 | static const char *branch; |
0d8fc3ef | 70 | static char *branch_mergeoptions; |
7610fa57 | 71 | static int option_renormalize; |
7f87aff2 | 72 | static int verbosity; |
cb6020bb | 73 | static int allow_rerere_auto; |
35d2fffd | 74 | static int abort_current_merge; |
367ff694 | 75 | static int continue_current_merge; |
e379fdf3 | 76 | static int allow_unrelated_histories; |
99bfc669 | 77 | static int show_progress = -1; |
a01f7f2b | 78 | static int default_to_upstream = 1; |
14d01b4f | 79 | static int signoff; |
ba3c69a9 | 80 | static const char *sign_commit; |
f8b86359 | 81 | static int verify_msg = 1; |
1c7b76be MV |
82 | |
83 | static struct strategy all_strategy[] = { | |
1c7b76be MV |
84 | { "recursive", DEFAULT_TWOHEAD | NO_TRIVIAL }, |
85 | { "octopus", DEFAULT_OCTOPUS }, | |
86 | { "resolve", 0 }, | |
1c7b76be MV |
87 | { "ours", NO_FAST_FORWARD | NO_TRIVIAL }, |
88 | { "subtree", NO_FAST_FORWARD | NO_TRIVIAL }, | |
89 | }; | |
90 | ||
91 | static const char *pull_twohead, *pull_octopus; | |
92 | ||
a54841e9 MV |
93 | enum ff_type { |
94 | FF_NO, | |
95 | FF_ALLOW, | |
96 | FF_ONLY | |
97 | }; | |
98 | ||
99 | static enum ff_type fast_forward = FF_ALLOW; | |
100 | ||
1c7b76be MV |
101 | static int option_parse_message(const struct option *opt, |
102 | const char *arg, int unset) | |
103 | { | |
104 | struct strbuf *buf = opt->value; | |
105 | ||
106 | if (unset) | |
107 | strbuf_setlen(buf, 0); | |
74f5b7fb | 108 | else if (arg) { |
ce9d823b | 109 | strbuf_addf(buf, "%s%s", buf->len ? "\n\n" : "", arg); |
1c7b76be | 110 | have_message = 1; |
74f5b7fb | 111 | } else |
bacec478 | 112 | return error(_("switch `m' requires a value")); |
1c7b76be MV |
113 | return 0; |
114 | } | |
115 | ||
920f22e6 JS |
116 | static int option_read_message(struct parse_opt_ctx_t *ctx, |
117 | const struct option *opt, int unset) | |
118 | { | |
119 | struct strbuf *buf = opt->value; | |
120 | const char *arg; | |
121 | ||
122 | if (unset) | |
123 | BUG("-F cannot be negated"); | |
124 | ||
125 | if (ctx->opt) { | |
126 | arg = ctx->opt; | |
127 | ctx->opt = NULL; | |
128 | } else if (ctx->argc > 1) { | |
129 | ctx->argc--; | |
130 | arg = *++ctx->argv; | |
131 | } else | |
9440b831 | 132 | return error(_("option `%s' requires a value"), opt->long_name); |
920f22e6 JS |
133 | |
134 | if (buf->len) | |
135 | strbuf_addch(buf, '\n'); | |
136 | if (ctx->prefix && !is_absolute_path(arg)) | |
137 | arg = prefix_filename(ctx->prefix, arg); | |
138 | if (strbuf_read_file(buf, arg, 0) < 0) | |
139 | return error(_("could not read file '%s'"), arg); | |
140 | have_message = 1; | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
1c7b76be MV |
145 | static struct strategy *get_strategy(const char *name) |
146 | { | |
147 | int i; | |
87091b49 MV |
148 | struct strategy *ret; |
149 | static struct cmdnames main_cmds, other_cmds; | |
e321180e | 150 | static int loaded; |
1c7b76be MV |
151 | |
152 | if (!name) | |
153 | return NULL; | |
154 | ||
155 | for (i = 0; i < ARRAY_SIZE(all_strategy); i++) | |
156 | if (!strcmp(name, all_strategy[i].name)) | |
157 | return &all_strategy[i]; | |
1719b5e4 | 158 | |
e321180e | 159 | if (!loaded) { |
87091b49 | 160 | struct cmdnames not_strategies; |
e321180e | 161 | loaded = 1; |
87091b49 | 162 | |
87091b49 | 163 | memset(¬_strategies, 0, sizeof(struct cmdnames)); |
e321180e | 164 | load_command_list("git-merge-", &main_cmds, &other_cmds); |
87091b49 MV |
165 | for (i = 0; i < main_cmds.cnt; i++) { |
166 | int j, found = 0; | |
167 | struct cmdname *ent = main_cmds.names[i]; | |
168 | for (j = 0; j < ARRAY_SIZE(all_strategy); j++) | |
169 | if (!strncmp(ent->name, all_strategy[j].name, ent->len) | |
170 | && !all_strategy[j].name[ent->len]) | |
171 | found = 1; | |
172 | if (!found) | |
173 | add_cmdname(¬_strategies, ent->name, ent->len); | |
87091b49 | 174 | } |
ed874656 | 175 | exclude_cmds(&main_cmds, ¬_strategies); |
87091b49 MV |
176 | } |
177 | if (!is_in_cmdlist(&main_cmds, name) && !is_in_cmdlist(&other_cmds, name)) { | |
bacec478 ÆAB |
178 | fprintf(stderr, _("Could not find merge strategy '%s'.\n"), name); |
179 | fprintf(stderr, _("Available strategies are:")); | |
131f9a10 JH |
180 | for (i = 0; i < main_cmds.cnt; i++) |
181 | fprintf(stderr, " %s", main_cmds.names[i]->name); | |
182 | fprintf(stderr, ".\n"); | |
183 | if (other_cmds.cnt) { | |
bacec478 | 184 | fprintf(stderr, _("Available custom strategies are:")); |
131f9a10 JH |
185 | for (i = 0; i < other_cmds.cnt; i++) |
186 | fprintf(stderr, " %s", other_cmds.names[i]->name); | |
187 | fprintf(stderr, ".\n"); | |
188 | } | |
87091b49 MV |
189 | exit(1); |
190 | } | |
191 | ||
19d4b416 | 192 | ret = xcalloc(1, sizeof(struct strategy)); |
87091b49 | 193 | ret->name = xstrdup(name); |
52b48ef1 | 194 | ret->attr = NO_TRIVIAL; |
87091b49 | 195 | return ret; |
1c7b76be MV |
196 | } |
197 | ||
198 | static void append_strategy(struct strategy *s) | |
199 | { | |
200 | ALLOC_GROW(use_strategies, use_strategies_nr + 1, use_strategies_alloc); | |
201 | use_strategies[use_strategies_nr++] = s; | |
202 | } | |
203 | ||
204 | static int option_parse_strategy(const struct option *opt, | |
205 | const char *name, int unset) | |
206 | { | |
1c7b76be MV |
207 | if (unset) |
208 | return 0; | |
209 | ||
1719b5e4 | 210 | append_strategy(get_strategy(name)); |
1c7b76be MV |
211 | return 0; |
212 | } | |
213 | ||
8cc5b290 AP |
214 | static int option_parse_x(const struct option *opt, |
215 | const char *arg, int unset) | |
216 | { | |
217 | if (unset) | |
218 | return 0; | |
219 | ||
220 | ALLOC_GROW(xopts, xopts_nr + 1, xopts_alloc); | |
221 | xopts[xopts_nr++] = xstrdup(arg); | |
222 | return 0; | |
223 | } | |
224 | ||
1c7b76be MV |
225 | static int option_parse_n(const struct option *opt, |
226 | const char *arg, int unset) | |
227 | { | |
517fe807 | 228 | BUG_ON_OPT_ARG(arg); |
1c7b76be MV |
229 | show_diffstat = unset; |
230 | return 0; | |
231 | } | |
232 | ||
233 | static struct option builtin_merge_options[] = { | |
234 | { OPTION_CALLBACK, 'n', NULL, NULL, NULL, | |
962e6295 | 235 | N_("do not show a diffstat at the end of the merge"), |
1c7b76be | 236 | PARSE_OPT_NOARG, option_parse_n }, |
d5d09d47 | 237 | OPT_BOOL(0, "stat", &show_diffstat, |
962e6295 | 238 | N_("show a diffstat at the end of the merge")), |
d5d09d47 | 239 | OPT_BOOL(0, "summary", &show_diffstat, N_("(synonym to --stat)")), |
962e6295 NTND |
240 | { OPTION_INTEGER, 0, "log", &shortlog_len, N_("n"), |
241 | N_("add (at most <n>) entries from shortlog to merge commit message"), | |
96e9420c | 242 | PARSE_OPT_OPTARG, NULL, DEFAULT_MERGE_LOG_LEN }, |
d5d09d47 | 243 | OPT_BOOL(0, "squash", &squash, |
962e6295 | 244 | N_("create a single commit instead of doing a merge")), |
d5d09d47 | 245 | OPT_BOOL(0, "commit", &option_commit, |
962e6295 | 246 | N_("perform a commit if the merge succeeds (default)")), |
f8246281 | 247 | OPT_BOOL('e', "edit", &option_edit, |
962e6295 | 248 | N_("edit message before committing")), |
a54841e9 | 249 | OPT_SET_INT(0, "ff", &fast_forward, N_("allow fast-forward (default)"), FF_ALLOW), |
3e4a67b4 NTND |
250 | OPT_SET_INT_F(0, "ff-only", &fast_forward, |
251 | N_("abort if fast-forward is not possible"), | |
252 | FF_ONLY, PARSE_OPT_NONEG), | |
cb6020bb | 253 | OPT_RERERE_AUTOUPDATE(&allow_rerere_auto), |
efed0022 | 254 | OPT_BOOL(0, "verify-signatures", &verify_signatures, |
c8bb9d2e | 255 | N_("verify that the named commit has a valid GPG signature")), |
962e6295 NTND |
256 | OPT_CALLBACK('s', "strategy", &use_strategies, N_("strategy"), |
257 | N_("merge strategy to use"), option_parse_strategy), | |
258 | OPT_CALLBACK('X', "strategy-option", &xopts, N_("option=value"), | |
259 | N_("option for selected merge strategy"), option_parse_x), | |
260 | OPT_CALLBACK('m', "message", &merge_msg, N_("message"), | |
261 | N_("merge commit message (for a non-fast-forward merge)"), | |
1c7b76be | 262 | option_parse_message), |
920f22e6 JS |
263 | { OPTION_LOWLEVEL_CALLBACK, 'F', "file", &merge_msg, N_("path"), |
264 | N_("read message from file"), PARSE_OPT_NONEG, | |
265 | (parse_opt_cb *) option_read_message }, | |
7f87aff2 | 266 | OPT__VERBOSITY(&verbosity), |
d5d09d47 | 267 | OPT_BOOL(0, "abort", &abort_current_merge, |
962e6295 | 268 | N_("abort the current in-progress merge")), |
367ff694 CP |
269 | OPT_BOOL(0, "continue", &continue_current_merge, |
270 | N_("continue the current in-progress merge")), | |
e379fdf3 JH |
271 | OPT_BOOL(0, "allow-unrelated-histories", &allow_unrelated_histories, |
272 | N_("allow merging unrelated histories")), | |
962e6295 | 273 | OPT_SET_INT(0, "progress", &show_progress, N_("force progress reporting"), 1), |
e703d711 | 274 | { OPTION_STRING, 'S', "gpg-sign", &sign_commit, N_("key-id"), |
962e6295 | 275 | N_("GPG sign commit"), PARSE_OPT_OPTARG, NULL, (intptr_t) "" }, |
d5d09d47 | 276 | OPT_BOOL(0, "overwrite-ignore", &overwrite_ignore, N_("update ignored files (default)")), |
14d01b4f | 277 | OPT_BOOL(0, "signoff", &signoff, N_("add Signed-off-by:")), |
f8b86359 | 278 | OPT_BOOL(0, "verify", &verify_msg, N_("verify commit-msg hook")), |
1c7b76be MV |
279 | OPT_END() |
280 | }; | |
281 | ||
282 | /* Cleans up metadata that is uninteresting after a succeeded merge. */ | |
283 | static void drop_save(void) | |
284 | { | |
102de880 SB |
285 | unlink(git_path_merge_head(the_repository)); |
286 | unlink(git_path_merge_msg(the_repository)); | |
287 | unlink(git_path_merge_mode(the_repository)); | |
1c7b76be MV |
288 | } |
289 | ||
52684310 | 290 | static int save_state(struct object_id *stash) |
1c7b76be MV |
291 | { |
292 | int len; | |
d3180279 | 293 | struct child_process cp = CHILD_PROCESS_INIT; |
1c7b76be MV |
294 | struct strbuf buffer = STRBUF_INIT; |
295 | const char *argv[] = {"stash", "create", NULL}; | |
150888e2 | 296 | int rc = -1; |
1c7b76be | 297 | |
1c7b76be MV |
298 | cp.argv = argv; |
299 | cp.out = -1; | |
300 | cp.git_cmd = 1; | |
301 | ||
302 | if (start_command(&cp)) | |
bacec478 | 303 | die(_("could not run stash.")); |
1c7b76be MV |
304 | len = strbuf_read(&buffer, cp.out, 1024); |
305 | close(cp.out); | |
306 | ||
307 | if (finish_command(&cp) || len < 0) | |
bacec478 | 308 | die(_("stash failed")); |
b4fd9406 | 309 | else if (!len) /* no changes */ |
150888e2 | 310 | goto out; |
1c7b76be | 311 | strbuf_setlen(&buffer, buffer.len-1); |
52684310 | 312 | if (get_oid(buffer.buf, stash)) |
bacec478 | 313 | die(_("not a valid object: %s"), buffer.buf); |
150888e2 RS |
314 | rc = 0; |
315 | out: | |
316 | strbuf_release(&buffer); | |
317 | return rc; | |
1c7b76be MV |
318 | } |
319 | ||
cb91022c | 320 | static void read_empty(const struct object_id *oid, int verbose) |
172b6428 CB |
321 | { |
322 | int i = 0; | |
323 | const char *args[7]; | |
324 | ||
325 | args[i++] = "read-tree"; | |
326 | if (verbose) | |
327 | args[i++] = "-v"; | |
328 | args[i++] = "-m"; | |
329 | args[i++] = "-u"; | |
cb91022c | 330 | args[i++] = empty_tree_oid_hex(); |
331 | args[i++] = oid_to_hex(oid); | |
172b6428 CB |
332 | args[i] = NULL; |
333 | ||
334 | if (run_command_v_opt(args, RUN_GIT_CMD)) | |
bacec478 | 335 | die(_("read-tree failed")); |
172b6428 CB |
336 | } |
337 | ||
cb91022c | 338 | static void reset_hard(const struct object_id *oid, int verbose) |
1c7b76be MV |
339 | { |
340 | int i = 0; | |
341 | const char *args[6]; | |
342 | ||
343 | args[i++] = "read-tree"; | |
344 | if (verbose) | |
345 | args[i++] = "-v"; | |
346 | args[i++] = "--reset"; | |
347 | args[i++] = "-u"; | |
cb91022c | 348 | args[i++] = oid_to_hex(oid); |
1c7b76be MV |
349 | args[i] = NULL; |
350 | ||
351 | if (run_command_v_opt(args, RUN_GIT_CMD)) | |
bacec478 | 352 | die(_("read-tree failed")); |
1c7b76be MV |
353 | } |
354 | ||
52684310 | 355 | static void restore_state(const struct object_id *head, |
356 | const struct object_id *stash) | |
1c7b76be | 357 | { |
f285a2d7 | 358 | struct strbuf sb = STRBUF_INIT; |
1c7b76be MV |
359 | const char *args[] = { "stash", "apply", NULL, NULL }; |
360 | ||
52684310 | 361 | if (is_null_oid(stash)) |
1c7b76be MV |
362 | return; |
363 | ||
cb91022c | 364 | reset_hard(head, 1); |
1c7b76be | 365 | |
52684310 | 366 | args[2] = oid_to_hex(stash); |
1c7b76be MV |
367 | |
368 | /* | |
369 | * It is OK to ignore error here, for example when there was | |
370 | * nothing to restore. | |
371 | */ | |
372 | run_command_v_opt(args, RUN_GIT_CMD); | |
373 | ||
374 | strbuf_release(&sb); | |
375 | refresh_cache(REFRESH_QUIET); | |
376 | } | |
377 | ||
378 | /* This is called when no merge was necessary. */ | |
379 | static void finish_up_to_date(const char *msg) | |
380 | { | |
7f87aff2 | 381 | if (verbosity >= 0) |
bacec478 | 382 | printf("%s%s\n", squash ? _(" (nothing to squash)") : "", msg); |
1c7b76be MV |
383 | drop_save(); |
384 | } | |
385 | ||
4c57bd27 | 386 | static void squash_message(struct commit *commit, struct commit_list *remoteheads) |
1c7b76be MV |
387 | { |
388 | struct rev_info rev; | |
f285a2d7 | 389 | struct strbuf out = STRBUF_INIT; |
1c7b76be | 390 | struct commit_list *j; |
dd2e794a | 391 | struct pretty_print_context ctx = {0}; |
1c7b76be | 392 | |
bacec478 | 393 | printf(_("Squash commit -- not updating HEAD\n")); |
1c7b76be | 394 | |
2abf3503 | 395 | repo_init_revisions(the_repository, &rev, NULL); |
1c7b76be MV |
396 | rev.ignore_merges = 1; |
397 | rev.commit_format = CMIT_FMT_MEDIUM; | |
398 | ||
1c7b76be MV |
399 | commit->object.flags |= UNINTERESTING; |
400 | add_pending_object(&rev, &commit->object, NULL); | |
401 | ||
402 | for (j = remoteheads; j; j = j->next) | |
403 | add_pending_object(&rev, &j->item->object, NULL); | |
404 | ||
405 | setup_revisions(0, NULL, &rev, NULL); | |
406 | if (prepare_revision_walk(&rev)) | |
bacec478 | 407 | die(_("revision walk setup failed")); |
1c7b76be | 408 | |
dd2e794a TR |
409 | ctx.abbrev = rev.abbrev; |
410 | ctx.date_mode = rev.date_mode; | |
6bf13944 | 411 | ctx.fmt = rev.commit_format; |
dd2e794a | 412 | |
1c7b76be MV |
413 | strbuf_addstr(&out, "Squashed commit of the following:\n"); |
414 | while ((commit = get_revision(&rev)) != NULL) { | |
415 | strbuf_addch(&out, '\n'); | |
416 | strbuf_addf(&out, "commit %s\n", | |
f2fd0760 | 417 | oid_to_hex(&commit->object.oid)); |
6bf13944 | 418 | pretty_print_commit(&ctx, commit, &out); |
1c7b76be | 419 | } |
102de880 | 420 | write_file_buf(git_path_squash_msg(the_repository), out.buf, out.len); |
1c7b76be MV |
421 | strbuf_release(&out); |
422 | } | |
423 | ||
894642f6 | 424 | static void finish(struct commit *head_commit, |
4c57bd27 | 425 | struct commit_list *remoteheads, |
52684310 | 426 | const struct object_id *new_head, const char *msg) |
1c7b76be | 427 | { |
f285a2d7 | 428 | struct strbuf reflog_message = STRBUF_INIT; |
52684310 | 429 | const struct object_id *head = &head_commit->object.oid; |
1c7b76be | 430 | |
1c7b76be MV |
431 | if (!msg) |
432 | strbuf_addstr(&reflog_message, getenv("GIT_REFLOG_ACTION")); | |
433 | else { | |
7f87aff2 TA |
434 | if (verbosity >= 0) |
435 | printf("%s\n", msg); | |
1c7b76be MV |
436 | strbuf_addf(&reflog_message, "%s: %s", |
437 | getenv("GIT_REFLOG_ACTION"), msg); | |
438 | } | |
439 | if (squash) { | |
4c57bd27 | 440 | squash_message(head_commit, remoteheads); |
1c7b76be | 441 | } else { |
7f87aff2 | 442 | if (verbosity >= 0 && !merge_msg.len) |
bacec478 | 443 | printf(_("No merge message -- not updating HEAD\n")); |
1c7b76be MV |
444 | else { |
445 | const char *argv_gc_auto[] = { "gc", "--auto", NULL }; | |
ae077771 | 446 | update_ref(reflog_message.buf, "HEAD", new_head, head, |
447 | 0, UPDATE_REFS_DIE_ON_ERR); | |
1c7b76be MV |
448 | /* |
449 | * We ignore errors in 'gc --auto', since the | |
450 | * user should see them. | |
451 | */ | |
d0b59866 | 452 | close_all_packs(the_repository->objects); |
1c7b76be MV |
453 | run_command_v_opt(argv_gc_auto, RUN_GIT_CMD); |
454 | } | |
455 | } | |
456 | if (new_head && show_diffstat) { | |
457 | struct diff_options opts; | |
e6757652 | 458 | repo_diff_setup(the_repository, &opts); |
7a7159ac | 459 | opts.stat_width = -1; /* use full terminal width */ |
df44483a | 460 | opts.stat_graph_width = -1; /* respect statGraphWidth config */ |
1c7b76be MV |
461 | opts.output_format |= |
462 | DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT; | |
463 | opts.detect_rename = DIFF_DETECT_RENAME; | |
28452655 | 464 | diff_setup_done(&opts); |
66f414f8 | 465 | diff_tree_oid(head, new_head, "", &opts); |
1c7b76be MV |
466 | diffcore_std(&opts); |
467 | diff_flush(&opts); | |
468 | } | |
469 | ||
470 | /* Run a post-merge hook */ | |
15048f8a | 471 | run_hook_le(NULL, "post-merge", squash ? "1" : "0", NULL); |
1c7b76be MV |
472 | |
473 | strbuf_release(&reflog_message); | |
474 | } | |
475 | ||
476 | /* Get the name for the merge commit's message. */ | |
477 | static void merge_name(const char *remote, struct strbuf *msg) | |
478 | { | |
ae8e4c9c | 479 | struct commit *remote_head; |
52684310 | 480 | struct object_id branch_head; |
f285a2d7 | 481 | struct strbuf buf = STRBUF_INIT; |
c9717ee9 | 482 | struct strbuf bname = STRBUF_INIT; |
e2e5ac23 | 483 | struct merge_remote_desc *desc; |
1c7b76be | 484 | const char *ptr; |
751c5974 | 485 | char *found_ref; |
1c7b76be MV |
486 | int len, early; |
487 | ||
0e9f62da | 488 | strbuf_branchname(&bname, remote, 0); |
a552de75 | 489 | remote = bname.buf; |
c9717ee9 | 490 | |
52684310 | 491 | oidclr(&branch_head); |
ae8e4c9c | 492 | remote_head = get_merge_parent(remote); |
1c7b76be | 493 | if (!remote_head) |
bacec478 | 494 | die(_("'%s' does not point to a commit"), remote); |
1c7b76be | 495 | |
cca5fa64 | 496 | if (dwim_ref(remote, strlen(remote), &branch_head, &found_ref) > 0) { |
59556548 | 497 | if (starts_with(found_ref, "refs/heads/")) { |
751c5974 | 498 | strbuf_addf(msg, "%s\t\tbranch '%s' of .\n", |
52684310 | 499 | oid_to_hex(&branch_head), remote); |
751c5974 JK |
500 | goto cleanup; |
501 | } | |
59556548 | 502 | if (starts_with(found_ref, "refs/tags/")) { |
57b58db7 | 503 | strbuf_addf(msg, "%s\t\ttag '%s' of .\n", |
52684310 | 504 | oid_to_hex(&branch_head), remote); |
57b58db7 JH |
505 | goto cleanup; |
506 | } | |
59556548 | 507 | if (starts_with(found_ref, "refs/remotes/")) { |
13931236 | 508 | strbuf_addf(msg, "%s\t\tremote-tracking branch '%s' of .\n", |
52684310 | 509 | oid_to_hex(&branch_head), remote); |
69a8b7c7 JK |
510 | goto cleanup; |
511 | } | |
1c7b76be MV |
512 | } |
513 | ||
514 | /* See if remote matches <name>^^^.. or <name>~<number> */ | |
515 | for (len = 0, ptr = remote + strlen(remote); | |
516 | remote < ptr && ptr[-1] == '^'; | |
517 | ptr--) | |
518 | len++; | |
519 | if (len) | |
520 | early = 1; | |
521 | else { | |
522 | early = 0; | |
523 | ptr = strrchr(remote, '~'); | |
524 | if (ptr) { | |
525 | int seen_nonzero = 0; | |
526 | ||
527 | len++; /* count ~ */ | |
528 | while (*++ptr && isdigit(*ptr)) { | |
529 | seen_nonzero |= (*ptr != '0'); | |
530 | len++; | |
531 | } | |
532 | if (*ptr) | |
533 | len = 0; /* not ...~<number> */ | |
534 | else if (seen_nonzero) | |
535 | early = 1; | |
536 | else if (len == 1) | |
537 | early = 1; /* "name~" is "name~1"! */ | |
538 | } | |
539 | } | |
540 | if (len) { | |
541 | struct strbuf truname = STRBUF_INIT; | |
1016658d | 542 | strbuf_addf(&truname, "refs/heads/%s", remote); |
9b6bf4d5 | 543 | strbuf_setlen(&truname, truname.len - len); |
c6893323 | 544 | if (ref_exists(truname.buf)) { |
1c7b76be MV |
545 | strbuf_addf(msg, |
546 | "%s\t\tbranch '%s'%s of .\n", | |
c368dde9 | 547 | oid_to_hex(&remote_head->object.oid), |
9b6bf4d5 | 548 | truname.buf + 11, |
1c7b76be | 549 | (early ? " (early part)" : "")); |
c9717ee9 JH |
550 | strbuf_release(&truname); |
551 | goto cleanup; | |
1c7b76be | 552 | } |
1016658d | 553 | strbuf_release(&truname); |
1c7b76be | 554 | } |
2d1495fe | 555 | |
e2e5ac23 NTND |
556 | desc = merge_remote_util(remote_head); |
557 | if (desc && desc->obj && desc->obj->type == OBJ_TAG) { | |
558 | strbuf_addf(msg, "%s\t\t%s '%s'\n", | |
559 | oid_to_hex(&desc->obj->oid), | |
560 | type_name(desc->obj->type), | |
561 | remote); | |
562 | goto cleanup; | |
2d1495fe JH |
563 | } |
564 | ||
1c7b76be | 565 | strbuf_addf(msg, "%s\t\tcommit '%s'\n", |
c368dde9 | 566 | oid_to_hex(&remote_head->object.oid), remote); |
c9717ee9 JH |
567 | cleanup: |
568 | strbuf_release(&buf); | |
569 | strbuf_release(&bname); | |
1c7b76be MV |
570 | } |
571 | ||
0d8fc3ef JH |
572 | static void parse_branch_merge_options(char *bmo) |
573 | { | |
574 | const char **argv; | |
575 | int argc; | |
576 | ||
577 | if (!bmo) | |
578 | return; | |
579 | argc = split_cmdline(bmo, &argv); | |
580 | if (argc < 0) | |
c7fe5b61 | 581 | die(_("Bad branch.%s.mergeoptions string: %s"), branch, |
a7412ae1 | 582 | _(split_cmdline_strerror(argc))); |
2756ca43 | 583 | REALLOC_ARRAY(argv, argc + 2); |
f331ab9d | 584 | MOVE_ARRAY(argv + 1, argv, argc + 1); |
0d8fc3ef JH |
585 | argc++; |
586 | argv[0] = "branch.*.mergeoptions"; | |
587 | parse_options(argc, argv, NULL, builtin_merge_options, | |
588 | builtin_merge_usage, 0); | |
589 | free(argv); | |
590 | } | |
591 | ||
186458b1 | 592 | static int git_merge_config(const char *k, const char *v, void *cb) |
1c7b76be | 593 | { |
898eacd8 JH |
594 | int status; |
595 | ||
59556548 CC |
596 | if (branch && starts_with(k, "branch.") && |
597 | starts_with(k + 7, branch) && | |
1c7b76be | 598 | !strcmp(k + 7 + strlen(branch), ".mergeoptions")) { |
0d8fc3ef JH |
599 | free(branch_mergeoptions); |
600 | branch_mergeoptions = xstrdup(v); | |
601 | return 0; | |
1c7b76be MV |
602 | } |
603 | ||
604 | if (!strcmp(k, "merge.diffstat") || !strcmp(k, "merge.stat")) | |
605 | show_diffstat = git_config_bool(k, v); | |
ca779e82 HJI |
606 | else if (!strcmp(k, "merge.verifysignatures")) |
607 | verify_signatures = git_config_bool(k, v); | |
1c7b76be MV |
608 | else if (!strcmp(k, "pull.twohead")) |
609 | return git_config_string(&pull_twohead, k, v); | |
610 | else if (!strcmp(k, "pull.octopus")) | |
611 | return git_config_string(&pull_octopus, k, v); | |
7610fa57 JN |
612 | else if (!strcmp(k, "merge.renormalize")) |
613 | option_renormalize = git_config_bool(k, v); | |
898eacd8 | 614 | else if (!strcmp(k, "merge.ff")) { |
89576613 | 615 | int boolval = git_parse_maybe_bool(v); |
f23e8dec | 616 | if (0 <= boolval) { |
a54841e9 | 617 | fast_forward = boolval ? FF_ALLOW : FF_NO; |
f23e8dec | 618 | } else if (v && !strcmp(v, "only")) { |
a54841e9 | 619 | fast_forward = FF_ONLY; |
f23e8dec JH |
620 | } /* do not barf on values from future versions of git */ |
621 | return 0; | |
93e535a5 JH |
622 | } else if (!strcmp(k, "merge.defaulttoupstream")) { |
623 | default_to_upstream = git_config_bool(k, v); | |
624 | return 0; | |
d95bfb12 NV |
625 | } else if (!strcmp(k, "commit.gpgsign")) { |
626 | sign_commit = git_config_bool(k, v) ? "" : NULL; | |
627 | return 0; | |
96e9420c | 628 | } |
ba3c69a9 | 629 | |
898eacd8 | 630 | status = fmt_merge_msg_config(k, v, cb); |
5de89d3a JH |
631 | if (status) |
632 | return status; | |
ba3c69a9 | 633 | status = git_gpg_config(k, v, NULL); |
898eacd8 JH |
634 | if (status) |
635 | return status; | |
1c7b76be MV |
636 | return git_diff_ui_config(k, v, cb); |
637 | } | |
638 | ||
52684310 | 639 | static int read_tree_trivial(struct object_id *common, struct object_id *head, |
640 | struct object_id *one) | |
1c7b76be MV |
641 | { |
642 | int i, nr_trees = 0; | |
643 | struct tree *trees[MAX_UNPACK_TREES]; | |
644 | struct tree_desc t[MAX_UNPACK_TREES]; | |
645 | struct unpack_trees_options opts; | |
646 | ||
647 | memset(&opts, 0, sizeof(opts)); | |
648 | opts.head_idx = 2; | |
649 | opts.src_index = &the_index; | |
650 | opts.dst_index = &the_index; | |
651 | opts.update = 1; | |
652 | opts.verbose_update = 1; | |
653 | opts.trivial_merges_only = 1; | |
654 | opts.merge = 1; | |
a9dbc179 | 655 | trees[nr_trees] = parse_tree_indirect(common); |
1c7b76be MV |
656 | if (!trees[nr_trees++]) |
657 | return -1; | |
a9dbc179 | 658 | trees[nr_trees] = parse_tree_indirect(head); |
1c7b76be MV |
659 | if (!trees[nr_trees++]) |
660 | return -1; | |
a9dbc179 | 661 | trees[nr_trees] = parse_tree_indirect(one); |
1c7b76be MV |
662 | if (!trees[nr_trees++]) |
663 | return -1; | |
664 | opts.fn = threeway_merge; | |
665 | cache_tree_free(&active_cache_tree); | |
666 | for (i = 0; i < nr_trees; i++) { | |
667 | parse_tree(trees[i]); | |
668 | init_tree_desc(t+i, trees[i]->buffer, trees[i]->size); | |
669 | } | |
670 | if (unpack_trees(nr_trees, t, &opts)) | |
671 | return -1; | |
672 | return 0; | |
673 | } | |
674 | ||
52684310 | 675 | static void write_tree_trivial(struct object_id *oid) |
1c7b76be | 676 | { |
fc5cb99f | 677 | if (write_cache_as_tree(oid, 0, NULL)) |
bacec478 | 678 | die(_("git write-tree failed to write a tree")); |
1c7b76be MV |
679 | } |
680 | ||
3f9083cd | 681 | static int try_merge_strategy(const char *strategy, struct commit_list *common, |
4c57bd27 | 682 | struct commit_list *remoteheads, |
b4391657 | 683 | struct commit *head) |
3f9083cd | 684 | { |
b2275868 | 685 | struct lock_file lock = LOCK_INIT; |
b4391657 | 686 | const char *head_arg = "HEAD"; |
668f26ff | 687 | |
b3e83cc7 | 688 | hold_locked_index(&lock, LOCK_DIE_ON_ERROR); |
668f26ff | 689 | refresh_cache(REFRESH_QUIET); |
61000814 MÅ |
690 | if (write_locked_index(&the_index, &lock, |
691 | COMMIT_LOCK | SKIP_IF_UNCHANGED)) | |
bacec478 | 692 | return error(_("Unable to write index.")); |
1c7b76be | 693 | |
18668f53 | 694 | if (!strcmp(strategy, "recursive") || !strcmp(strategy, "subtree")) { |
3f9083cd | 695 | int clean, x; |
18668f53 | 696 | struct commit *result; |
18668f53 MV |
697 | struct commit_list *reversed = NULL; |
698 | struct merge_options o; | |
3f9083cd | 699 | struct commit_list *j; |
18668f53 MV |
700 | |
701 | if (remoteheads->next) { | |
bacec478 | 702 | error(_("Not handling anything other than two heads merge.")); |
18668f53 MV |
703 | return 2; |
704 | } | |
705 | ||
0d6caa2d | 706 | init_merge_options(&o, the_repository); |
18668f53 | 707 | if (!strcmp(strategy, "subtree")) |
85e51b78 | 708 | o.subtree_shift = ""; |
8cc5b290 | 709 | |
7610fa57 | 710 | o.renormalize = option_renormalize; |
99bfc669 JK |
711 | o.show_rename_progress = |
712 | show_progress == -1 ? isatty(2) : show_progress; | |
7610fa57 | 713 | |
635a7bb1 JN |
714 | for (x = 0; x < xopts_nr; x++) |
715 | if (parse_merge_opt(&o, xopts[x])) | |
bacec478 | 716 | die(_("Unknown option for merge-recursive: -X%s"), xopts[x]); |
18668f53 MV |
717 | |
718 | o.branch1 = head_arg; | |
ae8e4c9c | 719 | o.branch2 = merge_remote_util(remoteheads->item)->name; |
18668f53 MV |
720 | |
721 | for (j = common; j; j = j->next) | |
722 | commit_list_insert(j->item, &reversed); | |
723 | ||
b3e83cc7 | 724 | hold_locked_index(&lock, LOCK_DIE_ON_ERROR); |
894642f6 | 725 | clean = merge_recursive(&o, head, |
18668f53 | 726 | remoteheads->item, reversed, &result); |
f241ff0d JS |
727 | if (clean < 0) |
728 | exit(128); | |
61000814 MÅ |
729 | if (write_locked_index(&the_index, &lock, |
730 | COMMIT_LOCK | SKIP_IF_UNCHANGED)) | |
1a07e59c | 731 | die(_("unable to write %s"), get_index_file()); |
18668f53 MV |
732 | return clean ? 0 : 1; |
733 | } else { | |
7e196c3a NTND |
734 | return try_merge_command(the_repository, |
735 | strategy, xopts_nr, xopts, | |
736 | common, head_arg, remoteheads); | |
18668f53 | 737 | } |
1c7b76be MV |
738 | } |
739 | ||
740 | static void count_diff_files(struct diff_queue_struct *q, | |
741 | struct diff_options *opt, void *data) | |
742 | { | |
743 | int *count = data; | |
744 | ||
745 | (*count) += q->nr; | |
746 | } | |
747 | ||
748 | static int count_unmerged_entries(void) | |
749 | { | |
1c7b76be MV |
750 | int i, ret = 0; |
751 | ||
be6ff819 JH |
752 | for (i = 0; i < active_nr; i++) |
753 | if (ce_stage(active_cache[i])) | |
1c7b76be MV |
754 | ret++; |
755 | ||
756 | return ret; | |
757 | } | |
758 | ||
1c7b76be MV |
759 | static void add_strategies(const char *string, unsigned attr) |
760 | { | |
02a8cfa4 RS |
761 | int i; |
762 | ||
763 | if (string) { | |
764 | struct string_list list = STRING_LIST_INIT_DUP; | |
765 | struct string_list_item *item; | |
766 | string_list_split(&list, string, ' ', -1); | |
767 | for_each_string_list_item(item, &list) | |
768 | append_strategy(get_strategy(item->string)); | |
769 | string_list_clear(&list, 0); | |
1c7b76be MV |
770 | return; |
771 | } | |
772 | for (i = 0; i < ARRAY_SIZE(all_strategy); i++) | |
773 | if (all_strategy[i].attr & attr) | |
774 | append_strategy(&all_strategy[i]); | |
775 | ||
776 | } | |
777 | ||
66f4b98a | 778 | static void read_merge_msg(struct strbuf *msg) |
65969d43 | 779 | { |
102de880 | 780 | const char *filename = git_path_merge_msg(the_repository); |
66f4b98a | 781 | strbuf_reset(msg); |
418c9b17 JN |
782 | if (strbuf_read_file(msg, filename, 0) < 0) |
783 | die_errno(_("Could not read from '%s'"), filename); | |
65969d43 JS |
784 | } |
785 | ||
4c57bd27 JH |
786 | static void write_merge_state(struct commit_list *); |
787 | static void abort_commit(struct commit_list *remoteheads, const char *err_msg) | |
65969d43 | 788 | { |
66f4b98a JS |
789 | if (err_msg) |
790 | error("%s", err_msg); | |
791 | fprintf(stderr, | |
792 | _("Not committing merge; use 'git commit' to complete the merge.\n")); | |
4c57bd27 | 793 | write_merge_state(remoteheads); |
66f4b98a JS |
794 | exit(1); |
795 | } | |
796 | ||
f26af3fc TR |
797 | static const char merge_editor_comment[] = |
798 | N_("Please enter a commit message to explain why this merge is necessary,\n" | |
799 | "especially if it merges an updated upstream into a topic branch.\n" | |
800 | "\n" | |
eff80a9f | 801 | "Lines starting with '%c' will be ignored, and an empty message aborts\n" |
f26af3fc TR |
802 | "the commit.\n"); |
803 | ||
9d89b355 | 804 | static void write_merge_heads(struct commit_list *); |
4c57bd27 | 805 | static void prepare_to_commit(struct commit_list *remoteheads) |
66f4b98a JS |
806 | { |
807 | struct strbuf msg = STRBUF_INIT; | |
808 | strbuf_addbuf(&msg, &merge_msg); | |
809 | strbuf_addch(&msg, '\n'); | |
62dc42b9 MG |
810 | if (squash) |
811 | BUG("the control must not reach here under --squash"); | |
f26af3fc | 812 | if (0 < option_edit) |
eff80a9f | 813 | strbuf_commented_addf(&msg, _(merge_editor_comment), comment_line_char); |
14d01b4f ŁG |
814 | if (signoff) |
815 | append_signoff(&msg, ignore_non_trailer(msg.buf, msg.len), 0); | |
9d89b355 | 816 | write_merge_heads(remoteheads); |
102de880 | 817 | write_file_buf(git_path_merge_msg(the_repository), msg.buf, msg.len); |
0a3beb0e | 818 | if (run_commit_hook(0 < option_edit, get_index_file(), "prepare-commit-msg", |
102de880 | 819 | git_path_merge_msg(the_repository), "merge", NULL)) |
3e4141d0 | 820 | abort_commit(remoteheads, NULL); |
f8246281 | 821 | if (0 < option_edit) { |
102de880 | 822 | if (launch_editor(git_path_merge_msg(the_repository), NULL, NULL)) |
4c57bd27 | 823 | abort_commit(remoteheads, NULL); |
66f4b98a | 824 | } |
f8b86359 SB |
825 | |
826 | if (verify_msg && run_commit_hook(0 < option_edit, get_index_file(), | |
827 | "commit-msg", | |
102de880 | 828 | git_path_merge_msg(the_repository), NULL)) |
f8b86359 SB |
829 | abort_commit(remoteheads, NULL); |
830 | ||
66f4b98a | 831 | read_merge_msg(&msg); |
63af4a84 | 832 | strbuf_stripspace(&msg, 0 < option_edit); |
66f4b98a | 833 | if (!msg.len) |
4c57bd27 | 834 | abort_commit(remoteheads, _("Empty commit message.")); |
66f4b98a JS |
835 | strbuf_release(&merge_msg); |
836 | strbuf_addbuf(&merge_msg, &msg); | |
837 | strbuf_release(&msg); | |
65969d43 JS |
838 | } |
839 | ||
4c57bd27 | 840 | static int merge_trivial(struct commit *head, struct commit_list *remoteheads) |
1c7b76be | 841 | { |
52684310 | 842 | struct object_id result_tree, result_commit; |
910a09a7 | 843 | struct commit_list *parents, **pptr = &parents; |
b2275868 | 844 | struct lock_file lock = LOCK_INIT; |
40d71940 | 845 | |
b3e83cc7 | 846 | hold_locked_index(&lock, LOCK_DIE_ON_ERROR); |
40d71940 | 847 | refresh_cache(REFRESH_QUIET); |
61000814 MÅ |
848 | if (write_locked_index(&the_index, &lock, |
849 | COMMIT_LOCK | SKIP_IF_UNCHANGED)) | |
40d71940 | 850 | return error(_("Unable to write index.")); |
1c7b76be | 851 | |
52684310 | 852 | write_tree_trivial(&result_tree); |
157efde1 | 853 | printf(_("Wonderful.\n")); |
910a09a7 RS |
854 | pptr = commit_list_append(head, pptr); |
855 | pptr = commit_list_append(remoteheads->item, pptr); | |
4c57bd27 | 856 | prepare_to_commit(remoteheads); |
5078f344 PO |
857 | if (commit_tree(merge_msg.buf, merge_msg.len, &result_tree, parents, |
858 | &result_commit, NULL, sign_commit)) | |
6b3c4c05 | 859 | die(_("failed to write commit object")); |
52684310 | 860 | finish(head, remoteheads, &result_commit, "In-index merge"); |
1c7b76be MV |
861 | drop_save(); |
862 | return 0; | |
863 | } | |
864 | ||
894642f6 | 865 | static int finish_automerge(struct commit *head, |
e78cbf8c | 866 | int head_subsumed, |
894642f6 | 867 | struct commit_list *common, |
4c57bd27 | 868 | struct commit_list *remoteheads, |
52684310 | 869 | struct object_id *result_tree, |
1c7b76be MV |
870 | const char *wt_strategy) |
871 | { | |
e78cbf8c | 872 | struct commit_list *parents = NULL; |
1c7b76be | 873 | struct strbuf buf = STRBUF_INIT; |
52684310 | 874 | struct object_id result_commit; |
1c7b76be MV |
875 | |
876 | free_commit_list(common); | |
e78cbf8c | 877 | parents = remoteheads; |
a54841e9 | 878 | if (!head_subsumed || fast_forward == FF_NO) |
894642f6 | 879 | commit_list_insert(head, &parents); |
1c7b76be | 880 | strbuf_addch(&merge_msg, '\n'); |
4c57bd27 | 881 | prepare_to_commit(remoteheads); |
5078f344 PO |
882 | if (commit_tree(merge_msg.buf, merge_msg.len, result_tree, parents, |
883 | &result_commit, NULL, sign_commit)) | |
6b3c4c05 | 884 | die(_("failed to write commit object")); |
f23101bf | 885 | strbuf_addf(&buf, "Merge made by the '%s' strategy.", wt_strategy); |
52684310 | 886 | finish(head, remoteheads, &result_commit, buf.buf); |
1c7b76be MV |
887 | strbuf_release(&buf); |
888 | drop_save(); | |
889 | return 0; | |
890 | } | |
891 | ||
08e3ce5a | 892 | static int suggest_conflicts(void) |
1c7b76be | 893 | { |
418c9b17 | 894 | const char *filename; |
1c7b76be | 895 | FILE *fp; |
75c961b7 | 896 | struct strbuf msgbuf = STRBUF_INIT; |
1c7b76be | 897 | |
102de880 | 898 | filename = git_path_merge_msg(the_repository); |
23a9e071 | 899 | fp = xfopen(filename, "a"); |
75c961b7 | 900 | |
f11c9580 | 901 | append_conflicts_hint(&the_index, &msgbuf); |
75c961b7 | 902 | fputs(msgbuf.buf, fp); |
8d025b7c | 903 | strbuf_release(&msgbuf); |
1c7b76be | 904 | fclose(fp); |
35843b11 | 905 | repo_rerere(the_repository, allow_rerere_auto); |
bacec478 ÆAB |
906 | printf(_("Automatic merge failed; " |
907 | "fix conflicts and then commit the result.\n")); | |
1c7b76be MV |
908 | return 1; |
909 | } | |
910 | ||
1c7b76be MV |
911 | static int evaluate_result(void) |
912 | { | |
913 | int cnt = 0; | |
914 | struct rev_info rev; | |
915 | ||
1c7b76be | 916 | /* Check how many files differ. */ |
2abf3503 | 917 | repo_init_revisions(the_repository, &rev, ""); |
1c7b76be MV |
918 | setup_revisions(0, NULL, &rev, NULL); |
919 | rev.diffopt.output_format |= | |
920 | DIFF_FORMAT_CALLBACK; | |
921 | rev.diffopt.format_callback = count_diff_files; | |
922 | rev.diffopt.format_callback_data = &cnt; | |
923 | run_diff_files(&rev, 0); | |
924 | ||
925 | /* | |
926 | * Check how many unmerged entries are | |
927 | * there. | |
928 | */ | |
929 | cnt += count_unmerged_entries(); | |
930 | ||
931 | return cnt; | |
932 | } | |
933 | ||
93e535a5 | 934 | /* |
d6ac1d21 | 935 | * Pretend as if the user told us to merge with the remote-tracking |
93e535a5 JH |
936 | * branch we have for the upstream of the current branch |
937 | */ | |
938 | static int setup_with_upstream(const char ***argv) | |
939 | { | |
940 | struct branch *branch = branch_get(NULL); | |
941 | int i; | |
942 | const char **args; | |
943 | ||
944 | if (!branch) | |
c7f426d4 | 945 | die(_("No current branch.")); |
9e3751d4 | 946 | if (!branch->remote_name) |
c7f426d4 | 947 | die(_("No remote for the current branch.")); |
93e535a5 | 948 | if (!branch->merge_nr) |
c7f426d4 | 949 | die(_("No default upstream defined for the current branch.")); |
93e535a5 | 950 | |
50a6c8ef | 951 | args = xcalloc(st_add(branch->merge_nr, 1), sizeof(char *)); |
93e535a5 JH |
952 | for (i = 0; i < branch->merge_nr; i++) { |
953 | if (!branch->merge[i]->dst) | |
d6ac1d21 | 954 | die(_("No remote-tracking branch for %s from %s"), |
93e535a5 JH |
955 | branch->merge[i]->src, branch->remote_name); |
956 | args[i] = branch->merge[i]->dst; | |
957 | } | |
958 | args[i] = NULL; | |
959 | *argv = args; | |
960 | return i; | |
961 | } | |
962 | ||
8e6a6bb3 | 963 | static void write_merge_heads(struct commit_list *remoteheads) |
66f4b98a | 964 | { |
66f4b98a JS |
965 | struct commit_list *j; |
966 | struct strbuf buf = STRBUF_INIT; | |
967 | ||
274a5c06 | 968 | for (j = remoteheads; j; j = j->next) { |
f2fd0760 | 969 | struct object_id *oid; |
274a5c06 | 970 | struct commit *c = j->item; |
e2e5ac23 NTND |
971 | struct merge_remote_desc *desc; |
972 | ||
973 | desc = merge_remote_util(c); | |
974 | if (desc && desc->obj) { | |
975 | oid = &desc->obj->oid; | |
274a5c06 | 976 | } else { |
f2fd0760 | 977 | oid = &c->object.oid; |
274a5c06 | 978 | } |
f2fd0760 | 979 | strbuf_addf(&buf, "%s\n", oid_to_hex(oid)); |
274a5c06 | 980 | } |
102de880 | 981 | write_file_buf(git_path_merge_head(the_repository), buf.buf, buf.len); |
418c9b17 | 982 | |
66f4b98a | 983 | strbuf_reset(&buf); |
a54841e9 | 984 | if (fast_forward == FF_NO) |
a22ae753 | 985 | strbuf_addstr(&buf, "no-ff"); |
102de880 | 986 | write_file_buf(git_path_merge_mode(the_repository), buf.buf, buf.len); |
814c4b37 | 987 | strbuf_release(&buf); |
66f4b98a JS |
988 | } |
989 | ||
8e6a6bb3 MG |
990 | static void write_merge_state(struct commit_list *remoteheads) |
991 | { | |
992 | write_merge_heads(remoteheads); | |
993 | strbuf_addch(&merge_msg, '\n'); | |
102de880 SB |
994 | write_file_buf(git_path_merge_msg(the_repository), merge_msg.buf, |
995 | merge_msg.len); | |
8e6a6bb3 MG |
996 | } |
997 | ||
f8246281 JH |
998 | static int default_edit_option(void) |
999 | { | |
1000 | static const char name[] = "GIT_MERGE_AUTOEDIT"; | |
1001 | const char *e = getenv(name); | |
1002 | struct stat st_stdin, st_stdout; | |
1003 | ||
1004 | if (have_message) | |
1005 | /* an explicit -m msg without --[no-]edit */ | |
1006 | return 0; | |
1007 | ||
1008 | if (e) { | |
89576613 | 1009 | int v = git_parse_maybe_bool(e); |
f8246281 | 1010 | if (v < 0) |
bef4830e | 1011 | die(_("Bad value '%s' in environment '%s'"), e, name); |
f8246281 JH |
1012 | return v; |
1013 | } | |
1014 | ||
1015 | /* Use editor if stdin and stdout are the same and is a tty */ | |
1016 | return (!fstat(0, &st_stdin) && | |
1017 | !fstat(1, &st_stdout) && | |
d46f476c | 1018 | isatty(0) && isatty(1) && |
f8246281 JH |
1019 | st_stdin.st_dev == st_stdout.st_dev && |
1020 | st_stdin.st_ino == st_stdout.st_ino && | |
1021 | st_stdin.st_mode == st_stdout.st_mode); | |
1022 | } | |
1023 | ||
34349dbf JH |
1024 | static struct commit_list *reduce_parents(struct commit *head_commit, |
1025 | int *head_subsumed, | |
1026 | struct commit_list *remoteheads) | |
b5d887f9 | 1027 | { |
e510ab89 | 1028 | struct commit_list *parents, **remotes; |
b5d887f9 | 1029 | |
0b10b8a3 JH |
1030 | /* |
1031 | * Is the current HEAD reachable from another commit being | |
1032 | * merged? If so we do not want to record it as a parent of | |
1033 | * the resulting merge, unless --no-ff is given. We will flip | |
1034 | * this variable to 0 when we find HEAD among the independent | |
1035 | * tips being merged. | |
1036 | */ | |
1037 | *head_subsumed = 1; | |
e78cbf8c | 1038 | |
0b10b8a3 | 1039 | /* Find what parents to record by checking independent ones. */ |
e78cbf8c | 1040 | parents = reduce_heads(remoteheads); |
4da72644 | 1041 | free_commit_list(remoteheads); |
e78cbf8c | 1042 | |
e510ab89 RS |
1043 | remoteheads = NULL; |
1044 | remotes = &remoteheads; | |
1045 | while (parents) { | |
1046 | struct commit *commit = pop_commit(&parents); | |
e78cbf8c JH |
1047 | if (commit == head_commit) |
1048 | *head_subsumed = 0; | |
1049 | else | |
1050 | remotes = &commit_list_insert(commit, remotes)->next; | |
1051 | } | |
b5d887f9 JH |
1052 | return remoteheads; |
1053 | } | |
f8246281 | 1054 | |
52fecab2 JH |
1055 | static void prepare_merge_message(struct strbuf *merge_names, struct strbuf *merge_msg) |
1056 | { | |
1057 | struct fmt_merge_msg_opts opts; | |
1058 | ||
1059 | memset(&opts, 0, sizeof(opts)); | |
1060 | opts.add_title = !have_message; | |
1061 | opts.shortlog_len = shortlog_len; | |
1062 | opts.credit_people = (0 < option_edit); | |
1063 | ||
1064 | fmt_merge_msg(merge_names, merge_msg, &opts); | |
1065 | if (merge_msg->len) | |
1066 | strbuf_setlen(merge_msg, merge_msg->len - 1); | |
1067 | } | |
1068 | ||
74e8bc59 JH |
1069 | static void handle_fetch_head(struct commit_list **remotes, struct strbuf *merge_names) |
1070 | { | |
1071 | const char *filename; | |
1072 | int fd, pos, npos; | |
1073 | struct strbuf fetch_head_file = STRBUF_INIT; | |
ab47df2d | 1074 | const unsigned hexsz = the_hash_algo->hexsz; |
74e8bc59 JH |
1075 | |
1076 | if (!merge_names) | |
1077 | merge_names = &fetch_head_file; | |
1078 | ||
102de880 | 1079 | filename = git_path_fetch_head(the_repository); |
74e8bc59 JH |
1080 | fd = open(filename, O_RDONLY); |
1081 | if (fd < 0) | |
1082 | die_errno(_("could not open '%s' for reading"), filename); | |
1083 | ||
1084 | if (strbuf_read(merge_names, fd, 0) < 0) | |
1085 | die_errno(_("could not read '%s'"), filename); | |
1086 | if (close(fd) < 0) | |
1087 | die_errno(_("could not close '%s'"), filename); | |
1088 | ||
1089 | for (pos = 0; pos < merge_names->len; pos = npos) { | |
52684310 | 1090 | struct object_id oid; |
74e8bc59 JH |
1091 | char *ptr; |
1092 | struct commit *commit; | |
1093 | ||
1094 | ptr = strchr(merge_names->buf + pos, '\n'); | |
1095 | if (ptr) | |
1096 | npos = ptr - merge_names->buf + 1; | |
1097 | else | |
1098 | npos = merge_names->len; | |
1099 | ||
ab47df2d | 1100 | if (npos - pos < hexsz + 2 || |
52684310 | 1101 | get_oid_hex(merge_names->buf + pos, &oid)) |
74e8bc59 | 1102 | commit = NULL; /* bad */ |
ab47df2d | 1103 | else if (memcmp(merge_names->buf + pos + hexsz, "\t\t", 2)) |
74e8bc59 JH |
1104 | continue; /* not-for-merge */ |
1105 | else { | |
ab47df2d | 1106 | char saved = merge_names->buf[pos + hexsz]; |
1107 | merge_names->buf[pos + hexsz] = '\0'; | |
74e8bc59 | 1108 | commit = get_merge_parent(merge_names->buf + pos); |
ab47df2d | 1109 | merge_names->buf[pos + hexsz] = saved; |
74e8bc59 JH |
1110 | } |
1111 | if (!commit) { | |
1112 | if (ptr) | |
1113 | *ptr = '\0'; | |
bef4830e | 1114 | die(_("not something we can merge in %s: %s"), |
74e8bc59 JH |
1115 | filename, merge_names->buf + pos); |
1116 | } | |
1117 | remotes = &commit_list_insert(commit, remotes)->next; | |
1118 | } | |
1119 | ||
1120 | if (merge_names == &fetch_head_file) | |
1121 | strbuf_release(&fetch_head_file); | |
1122 | } | |
1123 | ||
34349dbf JH |
1124 | static struct commit_list *collect_parents(struct commit *head_commit, |
1125 | int *head_subsumed, | |
1cf32f4d JH |
1126 | int argc, const char **argv, |
1127 | struct strbuf *merge_msg) | |
34349dbf JH |
1128 | { |
1129 | int i; | |
1130 | struct commit_list *remoteheads = NULL; | |
1131 | struct commit_list **remotes = &remoteheads; | |
77038015 JH |
1132 | struct strbuf merge_names = STRBUF_INIT, *autogen = NULL; |
1133 | ||
1134 | if (merge_msg && (!have_message || shortlog_len)) | |
1135 | autogen = &merge_names; | |
34349dbf JH |
1136 | |
1137 | if (head_commit) | |
1138 | remotes = &commit_list_insert(head_commit, remotes)->next; | |
34349dbf | 1139 | |
74e8bc59 JH |
1140 | if (argc == 1 && !strcmp(argv[0], "FETCH_HEAD")) { |
1141 | handle_fetch_head(remotes, autogen); | |
1142 | remoteheads = reduce_parents(head_commit, head_subsumed, remoteheads); | |
1143 | } else { | |
1144 | for (i = 0; i < argc; i++) { | |
1145 | struct commit *commit = get_merge_parent(argv[i]); | |
1146 | if (!commit) | |
1147 | help_unknown_ref(argv[i], "merge", | |
bef4830e | 1148 | _("not something we can merge")); |
74e8bc59 JH |
1149 | remotes = &commit_list_insert(commit, remotes)->next; |
1150 | } | |
1151 | remoteheads = reduce_parents(head_commit, head_subsumed, remoteheads); | |
1152 | if (autogen) { | |
1153 | struct commit_list *p; | |
1154 | for (p = remoteheads; p; p = p->next) | |
1155 | merge_name(merge_remote_util(p->item)->name, autogen); | |
1156 | } | |
1157 | } | |
1cf32f4d | 1158 | |
77038015 | 1159 | if (autogen) { |
77038015 JH |
1160 | prepare_merge_message(autogen, merge_msg); |
1161 | strbuf_release(autogen); | |
1cf32f4d JH |
1162 | } |
1163 | ||
1164 | return remoteheads; | |
34349dbf JH |
1165 | } |
1166 | ||
adcc94a0 JH |
1167 | static int merging_a_throwaway_tag(struct commit *commit) |
1168 | { | |
1169 | char *tag_ref; | |
1170 | struct object_id oid; | |
1171 | int is_throwaway_tag = 0; | |
1172 | ||
1173 | /* Are we merging a tag? */ | |
1174 | if (!merge_remote_util(commit) || | |
1175 | !merge_remote_util(commit)->obj || | |
1176 | merge_remote_util(commit)->obj->type != OBJ_TAG) | |
1177 | return is_throwaway_tag; | |
1178 | ||
1179 | /* | |
1180 | * Now we know we are merging a tag object. Are we downstream | |
1181 | * and following the tags from upstream? If so, we must have | |
1182 | * the tag object pointed at by "refs/tags/$T" where $T is the | |
1183 | * tagname recorded in the tag object. We want to allow such | |
1184 | * a "just to catch up" merge to fast-forward. | |
1185 | * | |
1186 | * Otherwise, we are playing an integrator's role, making a | |
1187 | * merge with a throw-away tag from a contributor with | |
1188 | * something like "git pull $contributor $signed_tag". | |
1189 | * We want to forbid such a merge from fast-forwarding | |
1190 | * by default; otherwise we would not keep the signature | |
1191 | * anywhere. | |
1192 | */ | |
1193 | tag_ref = xstrfmt("refs/tags/%s", | |
1194 | ((struct tag *)merge_remote_util(commit)->obj)->tag); | |
1195 | if (!read_ref(tag_ref, &oid) && | |
4a7e27e9 | 1196 | oideq(&oid, &merge_remote_util(commit)->obj->oid)) |
adcc94a0 JH |
1197 | is_throwaway_tag = 0; |
1198 | else | |
1199 | is_throwaway_tag = 1; | |
1200 | free(tag_ref); | |
1201 | return is_throwaway_tag; | |
1202 | } | |
1203 | ||
1c7b76be MV |
1204 | int cmd_merge(int argc, const char **argv, const char *prefix) |
1205 | { | |
52684310 | 1206 | struct object_id result_tree, stash, head_oid; |
894642f6 | 1207 | struct commit *head_commit; |
f285a2d7 | 1208 | struct strbuf buf = STRBUF_INIT; |
17377b62 | 1209 | int i, ret = 0, head_subsumed; |
1c7b76be MV |
1210 | int best_cnt = -1, merge_was_ok = 0, automerge_was_ok = 0; |
1211 | struct commit_list *common = NULL; | |
1212 | const char *best_strategy = NULL, *wt_strategy = NULL; | |
b5d887f9 | 1213 | struct commit_list *remoteheads, *p; |
96ec7b1e | 1214 | void *branch_to_free; |
367ff694 | 1215 | int orig_argc = argc; |
1c7b76be | 1216 | |
da53eec6 NTND |
1217 | if (argc == 2 && !strcmp(argv[1], "-h")) |
1218 | usage_with_options(builtin_merge_usage, builtin_merge_options); | |
1c7b76be MV |
1219 | |
1220 | /* | |
1221 | * Check if we are _not_ on a detached HEAD, i.e. if there is a | |
1222 | * current branch. | |
1223 | */ | |
0f2dc722 | 1224 | branch = branch_to_free = resolve_refdup("HEAD", 0, &head_oid, NULL); |
de3ce210 RS |
1225 | if (branch) |
1226 | skip_prefix(branch, "refs/heads/", &branch); | |
7adf5266 DS |
1227 | |
1228 | init_diff_ui_defaults(); | |
1229 | git_config(git_merge_config, NULL); | |
1230 | ||
52684310 | 1231 | if (!branch || is_null_oid(&head_oid)) |
894642f6 | 1232 | head_commit = NULL; |
baf18fc2 | 1233 | else |
bc83266a | 1234 | head_commit = lookup_commit_or_die(&head_oid, "HEAD"); |
1c7b76be | 1235 | |
0d8fc3ef JH |
1236 | if (branch_mergeoptions) |
1237 | parse_branch_merge_options(branch_mergeoptions); | |
37782920 | 1238 | argc = parse_options(argc, argv, prefix, builtin_merge_options, |
1c7b76be | 1239 | builtin_merge_usage, 0); |
898eacd8 JH |
1240 | if (shortlog_len < 0) |
1241 | shortlog_len = (merge_log_config > 0) ? merge_log_config : 0; | |
2a22c1b3 | 1242 | |
99bfc669 JK |
1243 | if (verbosity < 0 && show_progress == -1) |
1244 | show_progress = 0; | |
1245 | ||
35d2fffd JH |
1246 | if (abort_current_merge) { |
1247 | int nargc = 2; | |
1248 | const char *nargv[] = {"reset", "--merge", NULL}; | |
1249 | ||
042e290d | 1250 | if (orig_argc != 2) |
c7d227df | 1251 | usage_msg_opt(_("--abort expects no arguments"), |
042e290d CP |
1252 | builtin_merge_usage, builtin_merge_options); |
1253 | ||
102de880 | 1254 | if (!file_exists(git_path_merge_head(the_repository))) |
bacec478 | 1255 | die(_("There is no merge to abort (MERGE_HEAD missing).")); |
35d2fffd JH |
1256 | |
1257 | /* Invoke 'git reset --merge' */ | |
d5a35c11 NTND |
1258 | ret = cmd_reset(nargc, nargv, prefix); |
1259 | goto done; | |
35d2fffd JH |
1260 | } |
1261 | ||
367ff694 CP |
1262 | if (continue_current_merge) { |
1263 | int nargc = 1; | |
1264 | const char *nargv[] = {"commit", NULL}; | |
1265 | ||
1266 | if (orig_argc != 2) | |
c7d227df | 1267 | usage_msg_opt(_("--continue expects no arguments"), |
367ff694 CP |
1268 | builtin_merge_usage, builtin_merge_options); |
1269 | ||
102de880 | 1270 | if (!file_exists(git_path_merge_head(the_repository))) |
367ff694 CP |
1271 | die(_("There is no merge in progress (MERGE_HEAD missing).")); |
1272 | ||
1273 | /* Invoke 'git commit' */ | |
1274 | ret = cmd_commit(nargc, nargv, prefix); | |
1275 | goto done; | |
1276 | } | |
1277 | ||
2a22c1b3 JH |
1278 | if (read_cache_unmerged()) |
1279 | die_resolve_conflict("merge"); | |
1280 | ||
102de880 | 1281 | if (file_exists(git_path_merge_head(the_repository))) { |
2a22c1b3 JH |
1282 | /* |
1283 | * There is no unmerged entry, don't advise 'git | |
1284 | * add/rm <file>', just 'git commit'. | |
1285 | */ | |
1286 | if (advice_resolve_conflict) | |
bacec478 | 1287 | die(_("You have not concluded your merge (MERGE_HEAD exists).\n" |
ad5fe377 | 1288 | "Please, commit your changes before you merge.")); |
2a22c1b3 | 1289 | else |
bacec478 | 1290 | die(_("You have not concluded your merge (MERGE_HEAD exists).")); |
2a22c1b3 | 1291 | } |
102de880 | 1292 | if (file_exists(git_path_cherry_pick_head(the_repository))) { |
d7e5c0cb | 1293 | if (advice_resolve_conflict) |
f68f1801 | 1294 | die(_("You have not concluded your cherry-pick (CHERRY_PICK_HEAD exists).\n" |
ad5fe377 | 1295 | "Please, commit your changes before you merge.")); |
d7e5c0cb | 1296 | else |
f68f1801 | 1297 | die(_("You have not concluded your cherry-pick (CHERRY_PICK_HEAD exists).")); |
2a22c1b3 JH |
1298 | } |
1299 | resolve_undo_clear(); | |
1300 | ||
7f87aff2 TA |
1301 | if (verbosity < 0) |
1302 | show_diffstat = 0; | |
1c7b76be MV |
1303 | |
1304 | if (squash) { | |
a54841e9 | 1305 | if (fast_forward == FF_NO) |
bacec478 | 1306 | die(_("You cannot combine --squash with --no-ff.")); |
1c7b76be MV |
1307 | option_commit = 0; |
1308 | } | |
1309 | ||
00c7e7e7 JH |
1310 | if (!argc) { |
1311 | if (default_to_upstream) | |
1312 | argc = setup_with_upstream(&argv); | |
1313 | else | |
1314 | die(_("No commit specified and merge.defaultToUpstream not set.")); | |
1315 | } else if (argc == 1 && !strcmp(argv[0], "-")) { | |
1316 | argv[0] = "@{-1}"; | |
4e8115ff | 1317 | } |
00c7e7e7 | 1318 | |
1c7b76be MV |
1319 | if (!argc) |
1320 | usage_with_options(builtin_merge_usage, | |
1321 | builtin_merge_options); | |
1322 | ||
1faac1ce | 1323 | if (!head_commit) { |
1c7b76be MV |
1324 | /* |
1325 | * If the merged head is a valid one there is no reason | |
1326 | * to forbid "git merge" into a branch yet to be born. | |
1327 | * We do the same for "git pull". | |
1328 | */ | |
52684310 | 1329 | struct object_id *remote_head_oid; |
4be636f4 | 1330 | if (squash) |
bacec478 | 1331 | die(_("Squash commit into empty head not supported yet")); |
a54841e9 | 1332 | if (fast_forward == FF_NO) |
bacec478 ÆAB |
1333 | die(_("Non-fast-forward commit does not make sense into " |
1334 | "an empty head")); | |
1cf32f4d JH |
1335 | remoteheads = collect_parents(head_commit, &head_subsumed, |
1336 | argc, argv, NULL); | |
b84e65d4 | 1337 | if (!remoteheads) |
bacec478 | 1338 | die(_("%s - not something we can merge"), argv[0]); |
eaa4e59c JH |
1339 | if (remoteheads->next) |
1340 | die(_("Can merge only exactly one commit into empty head")); | |
7488ba3e JK |
1341 | |
1342 | if (verify_signatures) | |
1343 | verify_merge_signature(remoteheads->item, verbosity); | |
1344 | ||
52684310 | 1345 | remote_head_oid = &remoteheads->item->object.oid; |
cb91022c | 1346 | read_empty(remote_head_oid, 0); |
ae077771 | 1347 | update_ref("initial pull", "HEAD", remote_head_oid, NULL, 0, |
1348 | UPDATE_REFS_DIE_ON_ERR); | |
d5a35c11 | 1349 | goto done; |
1faac1ce | 1350 | } |
1c7b76be | 1351 | |
1faac1ce | 1352 | /* |
b4391657 JH |
1353 | * All the rest are the commits being merged; prepare |
1354 | * the standard merge summary message to be appended | |
1355 | * to the given message. | |
1faac1ce | 1356 | */ |
b4391657 JH |
1357 | remoteheads = collect_parents(head_commit, &head_subsumed, |
1358 | argc, argv, &merge_msg); | |
1c7b76be | 1359 | |
894642f6 | 1360 | if (!head_commit || !argc) |
1c7b76be MV |
1361 | usage_with_options(builtin_merge_usage, |
1362 | builtin_merge_options); | |
1363 | ||
efed0022 SG |
1364 | if (verify_signatures) { |
1365 | for (p = remoteheads; p; p = p->next) { | |
edc4d47d | 1366 | verify_merge_signature(p->item, verbosity); |
efed0022 SG |
1367 | } |
1368 | } | |
1369 | ||
1c7b76be | 1370 | strbuf_addstr(&buf, "merge"); |
b5d887f9 JH |
1371 | for (p = remoteheads; p; p = p->next) |
1372 | strbuf_addf(&buf, " %s", merge_remote_util(p->item)->name); | |
1c7b76be MV |
1373 | setenv("GIT_REFLOG_ACTION", buf.buf, 0); |
1374 | strbuf_reset(&buf); | |
1375 | ||
b5d887f9 JH |
1376 | for (p = remoteheads; p; p = p->next) { |
1377 | struct commit *commit = p->item; | |
ae8e4c9c | 1378 | strbuf_addf(&buf, "GITHEAD_%s", |
c368dde9 | 1379 | oid_to_hex(&commit->object.oid)); |
b5d887f9 | 1380 | setenv(buf.buf, merge_remote_util(commit)->name, 1); |
1c7b76be | 1381 | strbuf_reset(&buf); |
adcc94a0 | 1382 | if (fast_forward != FF_ONLY && merging_a_throwaway_tag(commit)) |
a54841e9 | 1383 | fast_forward = FF_NO; |
1c7b76be MV |
1384 | } |
1385 | ||
f8246281 JH |
1386 | if (option_edit < 0) |
1387 | option_edit = default_edit_option(); | |
1388 | ||
1c7b76be | 1389 | if (!use_strategies) { |
e78cbf8c JH |
1390 | if (!remoteheads) |
1391 | ; /* already up-to-date */ | |
1392 | else if (!remoteheads->next) | |
1c7b76be MV |
1393 | add_strategies(pull_twohead, DEFAULT_TWOHEAD); |
1394 | else | |
1395 | add_strategies(pull_octopus, DEFAULT_OCTOPUS); | |
1396 | } | |
1397 | ||
1398 | for (i = 0; i < use_strategies_nr; i++) { | |
1399 | if (use_strategies[i]->attr & NO_FAST_FORWARD) | |
a54841e9 | 1400 | fast_forward = FF_NO; |
1c7b76be MV |
1401 | if (use_strategies[i]->attr & NO_TRIVIAL) |
1402 | allow_trivial = 0; | |
1403 | } | |
1404 | ||
e78cbf8c JH |
1405 | if (!remoteheads) |
1406 | ; /* already up-to-date */ | |
1407 | else if (!remoteheads->next) | |
2ce406cc | 1408 | common = get_merge_bases(head_commit, remoteheads->item); |
1c7b76be MV |
1409 | else { |
1410 | struct commit_list *list = remoteheads; | |
894642f6 | 1411 | commit_list_insert(head_commit, &list); |
1c7b76be MV |
1412 | common = get_octopus_merge_bases(list); |
1413 | free(list); | |
1414 | } | |
1415 | ||
ae077771 | 1416 | update_ref("updating ORIG_HEAD", "ORIG_HEAD", |
1417 | &head_commit->object.oid, NULL, 0, UPDATE_REFS_DIE_ON_ERR); | |
1c7b76be | 1418 | |
e379fdf3 JH |
1419 | if (remoteheads && !common) { |
1420 | /* No common ancestors found. */ | |
1421 | if (!allow_unrelated_histories) | |
1422 | die(_("refusing to merge unrelated histories")); | |
1423 | /* otherwise, we need a real merge. */ | |
1424 | } else if (!remoteheads || | |
e78cbf8c JH |
1425 | (!remoteheads->next && !common->next && |
1426 | common->item == remoteheads->item)) { | |
1c7b76be MV |
1427 | /* |
1428 | * If head can reach all the merge then we are up to date. | |
1429 | * but first the most common case of merging one remote. | |
1430 | */ | |
7560f547 | 1431 | finish_up_to_date(_("Already up to date.")); |
d5a35c11 | 1432 | goto done; |
a54841e9 | 1433 | } else if (fast_forward != FF_NO && !remoteheads->next && |
1c7b76be | 1434 | !common->next && |
4a7e27e9 | 1435 | oideq(&common->item->object.oid, &head_commit->object.oid)) { |
1c7b76be | 1436 | /* Again the most common case of merging one remote. */ |
f285a2d7 | 1437 | struct strbuf msg = STRBUF_INIT; |
ae8e4c9c | 1438 | struct commit *commit; |
1c7b76be | 1439 | |
d59f765a | 1440 | if (verbosity >= 0) { |
ef2ed501 | 1441 | printf(_("Updating %s..%s\n"), |
aab9583f | 1442 | find_unique_abbrev(&head_commit->object.oid, |
ef2ed501 | 1443 | DEFAULT_ABBREV), |
aab9583f | 1444 | find_unique_abbrev(&remoteheads->item->object.oid, |
ef2ed501 | 1445 | DEFAULT_ABBREV)); |
d59f765a | 1446 | } |
a75d7b54 | 1447 | strbuf_addstr(&msg, "Fast-forward"); |
1c7b76be MV |
1448 | if (have_message) |
1449 | strbuf_addstr(&msg, | |
1450 | " (no commit created; -m option ignored)"); | |
ae8e4c9c | 1451 | commit = remoteheads->item; |
b7f7c079 | 1452 | if (!commit) { |
d5a35c11 NTND |
1453 | ret = 1; |
1454 | goto done; | |
1455 | } | |
1c7b76be | 1456 | |
7e196c3a NTND |
1457 | if (checkout_fast_forward(the_repository, |
1458 | &head_commit->object.oid, | |
f06e90da | 1459 | &commit->object.oid, |
db699a8a | 1460 | overwrite_ignore)) { |
d5a35c11 NTND |
1461 | ret = 1; |
1462 | goto done; | |
1463 | } | |
1c7b76be | 1464 | |
52684310 | 1465 | finish(head_commit, remoteheads, &commit->object.oid, msg.buf); |
1c7b76be | 1466 | drop_save(); |
d5a35c11 | 1467 | goto done; |
1c7b76be MV |
1468 | } else if (!remoteheads->next && common->next) |
1469 | ; | |
1470 | /* | |
a75d7b54 | 1471 | * We are not doing octopus and not fast-forward. Need |
1c7b76be MV |
1472 | * a real merge. |
1473 | */ | |
1474 | else if (!remoteheads->next && !common->next && option_commit) { | |
1475 | /* | |
a75d7b54 | 1476 | * We are not doing octopus, not fast-forward, and have |
1c7b76be MV |
1477 | * only one common. |
1478 | */ | |
1479 | refresh_cache(REFRESH_QUIET); | |
a54841e9 | 1480 | if (allow_trivial && fast_forward != FF_ONLY) { |
1c7b76be | 1481 | /* See if it is really trivial. */ |
f9bc573f | 1482 | git_committer_info(IDENT_STRICT); |
bacec478 | 1483 | printf(_("Trying really trivial in-index merge...\n")); |
52684310 | 1484 | if (!read_tree_trivial(&common->item->object.oid, |
1485 | &head_commit->object.oid, | |
1486 | &remoteheads->item->object.oid)) { | |
4c57bd27 | 1487 | ret = merge_trivial(head_commit, remoteheads); |
d5a35c11 NTND |
1488 | goto done; |
1489 | } | |
bacec478 | 1490 | printf(_("Nope.\n")); |
1c7b76be MV |
1491 | } |
1492 | } else { | |
1493 | /* | |
1494 | * An octopus. If we can reach all the remote we are up | |
1495 | * to date. | |
1496 | */ | |
1497 | int up_to_date = 1; | |
1498 | struct commit_list *j; | |
1499 | ||
1500 | for (j = remoteheads; j; j = j->next) { | |
1501 | struct commit_list *common_one; | |
1502 | ||
1503 | /* | |
1504 | * Here we *have* to calculate the individual | |
1505 | * merge_bases again, otherwise "git merge HEAD^ | |
1506 | * HEAD^^" would be missed. | |
1507 | */ | |
2ce406cc | 1508 | common_one = get_merge_bases(head_commit, j->item); |
9001dc2a | 1509 | if (!oideq(&common_one->item->object.oid, &j->item->object.oid)) { |
1c7b76be MV |
1510 | up_to_date = 0; |
1511 | break; | |
1512 | } | |
1513 | } | |
1514 | if (up_to_date) { | |
7560f547 | 1515 | finish_up_to_date(_("Already up to date. Yeeah!")); |
d5a35c11 | 1516 | goto done; |
1c7b76be MV |
1517 | } |
1518 | } | |
1519 | ||
a54841e9 | 1520 | if (fast_forward == FF_ONLY) |
bacec478 | 1521 | die(_("Not possible to fast-forward, aborting.")); |
13474835 | 1522 | |
1c7b76be | 1523 | /* We are going to make a new commit. */ |
f9bc573f | 1524 | git_committer_info(IDENT_STRICT); |
1c7b76be MV |
1525 | |
1526 | /* | |
1527 | * At this point, we need a real merge. No matter what strategy | |
1528 | * we use, it would operate on the index, possibly affecting the | |
1529 | * working tree, and when resolved cleanly, have the desired | |
1530 | * tree in the index -- this means that the index must be in | |
1531 | * sync with the head commit. The strategies are responsible | |
1532 | * to ensure this. | |
1533 | */ | |
b4fd9406 NTND |
1534 | if (use_strategies_nr == 1 || |
1535 | /* | |
1536 | * Stash away the local changes so that we can try more than one. | |
1537 | */ | |
52684310 | 1538 | save_state(&stash)) |
1539 | oidclr(&stash); | |
1c7b76be MV |
1540 | |
1541 | for (i = 0; i < use_strategies_nr; i++) { | |
1542 | int ret; | |
1543 | if (i) { | |
bacec478 | 1544 | printf(_("Rewinding the tree to pristine...\n")); |
52684310 | 1545 | restore_state(&head_commit->object.oid, &stash); |
1c7b76be MV |
1546 | } |
1547 | if (use_strategies_nr != 1) | |
bacec478 | 1548 | printf(_("Trying merge strategy %s...\n"), |
1c7b76be MV |
1549 | use_strategies[i]->name); |
1550 | /* | |
1551 | * Remember which strategy left the state in the working | |
1552 | * tree. | |
1553 | */ | |
1554 | wt_strategy = use_strategies[i]->name; | |
1555 | ||
1556 | ret = try_merge_strategy(use_strategies[i]->name, | |
4c57bd27 | 1557 | common, remoteheads, |
b4391657 | 1558 | head_commit); |
1c7b76be MV |
1559 | if (!option_commit && !ret) { |
1560 | merge_was_ok = 1; | |
1561 | /* | |
1562 | * This is necessary here just to avoid writing | |
1563 | * the tree, but later we will *not* exit with | |
1564 | * status code 1 because merge_was_ok is set. | |
1565 | */ | |
1566 | ret = 1; | |
1567 | } | |
1568 | ||
1569 | if (ret) { | |
1570 | /* | |
1571 | * The backend exits with 1 when conflicts are | |
1572 | * left to be resolved, with 2 when it does not | |
1573 | * handle the given merge at all. | |
1574 | */ | |
1575 | if (ret == 1) { | |
1576 | int cnt = evaluate_result(); | |
1577 | ||
1578 | if (best_cnt <= 0 || cnt <= best_cnt) { | |
1579 | best_strategy = use_strategies[i]->name; | |
1580 | best_cnt = cnt; | |
1581 | } | |
1582 | } | |
1583 | if (merge_was_ok) | |
1584 | break; | |
1585 | else | |
1586 | continue; | |
1587 | } | |
1588 | ||
1589 | /* Automerge succeeded. */ | |
52684310 | 1590 | write_tree_trivial(&result_tree); |
1c7b76be MV |
1591 | automerge_was_ok = 1; |
1592 | break; | |
1593 | } | |
1594 | ||
1595 | /* | |
1596 | * If we have a resulting tree, that means the strategy module | |
1597 | * auto resolved the merge cleanly. | |
1598 | */ | |
d5a35c11 | 1599 | if (automerge_was_ok) { |
e78cbf8c JH |
1600 | ret = finish_automerge(head_commit, head_subsumed, |
1601 | common, remoteheads, | |
52684310 | 1602 | &result_tree, wt_strategy); |
d5a35c11 NTND |
1603 | goto done; |
1604 | } | |
1c7b76be MV |
1605 | |
1606 | /* | |
1607 | * Pick the result from the best strategy and have the user fix | |
1608 | * it up. | |
1609 | */ | |
1610 | if (!best_strategy) { | |
52684310 | 1611 | restore_state(&head_commit->object.oid, &stash); |
1c7b76be MV |
1612 | if (use_strategies_nr > 1) |
1613 | fprintf(stderr, | |
bacec478 | 1614 | _("No merge strategy handled the merge.\n")); |
1c7b76be | 1615 | else |
bacec478 | 1616 | fprintf(stderr, _("Merge with strategy %s failed.\n"), |
1c7b76be | 1617 | use_strategies[0]->name); |
d5a35c11 NTND |
1618 | ret = 2; |
1619 | goto done; | |
1c7b76be MV |
1620 | } else if (best_strategy == wt_strategy) |
1621 | ; /* We already have its result in the working tree. */ | |
1622 | else { | |
bacec478 | 1623 | printf(_("Rewinding the tree to pristine...\n")); |
52684310 | 1624 | restore_state(&head_commit->object.oid, &stash); |
bacec478 | 1625 | printf(_("Using the %s to prepare resolving by hand.\n"), |
1c7b76be | 1626 | best_strategy); |
4c57bd27 | 1627 | try_merge_strategy(best_strategy, common, remoteheads, |
b4391657 | 1628 | head_commit); |
1c7b76be MV |
1629 | } |
1630 | ||
1631 | if (squash) | |
4c57bd27 | 1632 | finish(head_commit, remoteheads, NULL, NULL); |
66f4b98a | 1633 | else |
4c57bd27 | 1634 | write_merge_state(remoteheads); |
1c7b76be | 1635 | |
d5a35c11 | 1636 | if (merge_was_ok) |
bacec478 ÆAB |
1637 | fprintf(stderr, _("Automatic merge went well; " |
1638 | "stopped before committing as requested\n")); | |
d5a35c11 | 1639 | else |
08e3ce5a | 1640 | ret = suggest_conflicts(); |
d5a35c11 NTND |
1641 | |
1642 | done: | |
96ec7b1e | 1643 | free(branch_to_free); |
d5a35c11 | 1644 | return ret; |
1c7b76be | 1645 | } |