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26ae337b RR |
1 | #include "cache.h" |
2 | #include "sequencer.h" | |
26ae337b | 3 | #include "dir.h" |
043a4492 RR |
4 | #include "object.h" |
5 | #include "commit.h" | |
6 | #include "tag.h" | |
7 | #include "run-command.h" | |
8 | #include "exec_cmd.h" | |
9 | #include "utf8.h" | |
10 | #include "cache-tree.h" | |
11 | #include "diff.h" | |
12 | #include "revision.h" | |
13 | #include "rerere.h" | |
14 | #include "merge-recursive.h" | |
15 | #include "refs.h" | |
16 | ||
17 | #define GIT_REFLOG_ACTION "GIT_REFLOG_ACTION" | |
26ae337b | 18 | |
d596118d | 19 | void remove_sequencer_state(void) |
26ae337b RR |
20 | { |
21 | struct strbuf seq_dir = STRBUF_INIT; | |
26ae337b RR |
22 | |
23 | strbuf_addf(&seq_dir, "%s", git_path(SEQ_DIR)); | |
d596118d | 24 | remove_dir_recursively(&seq_dir, 0); |
26ae337b | 25 | strbuf_release(&seq_dir); |
26ae337b | 26 | } |
043a4492 RR |
27 | |
28 | static const char *action_name(const struct replay_opts *opts) | |
29 | { | |
30 | return opts->action == REPLAY_REVERT ? "revert" : "cherry-pick"; | |
31 | } | |
32 | ||
33 | static char *get_encoding(const char *message); | |
34 | ||
35 | struct commit_message { | |
36 | char *parent_label; | |
37 | const char *label; | |
38 | const char *subject; | |
39 | char *reencoded_message; | |
40 | const char *message; | |
41 | }; | |
42 | ||
43 | static int get_message(struct commit *commit, struct commit_message *out) | |
44 | { | |
45 | const char *encoding; | |
46 | const char *abbrev, *subject; | |
47 | int abbrev_len, subject_len; | |
48 | char *q; | |
49 | ||
50 | if (!commit->buffer) | |
51 | return -1; | |
52 | encoding = get_encoding(commit->buffer); | |
53 | if (!encoding) | |
54 | encoding = "UTF-8"; | |
55 | if (!git_commit_encoding) | |
56 | git_commit_encoding = "UTF-8"; | |
57 | ||
58 | out->reencoded_message = NULL; | |
59 | out->message = commit->buffer; | |
60 | if (strcmp(encoding, git_commit_encoding)) | |
61 | out->reencoded_message = reencode_string(commit->buffer, | |
62 | git_commit_encoding, encoding); | |
63 | if (out->reencoded_message) | |
64 | out->message = out->reencoded_message; | |
65 | ||
66 | abbrev = find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV); | |
67 | abbrev_len = strlen(abbrev); | |
68 | ||
69 | subject_len = find_commit_subject(out->message, &subject); | |
70 | ||
71 | out->parent_label = xmalloc(strlen("parent of ") + abbrev_len + | |
72 | strlen("... ") + subject_len + 1); | |
73 | q = out->parent_label; | |
74 | q = mempcpy(q, "parent of ", strlen("parent of ")); | |
75 | out->label = q; | |
76 | q = mempcpy(q, abbrev, abbrev_len); | |
77 | q = mempcpy(q, "... ", strlen("... ")); | |
78 | out->subject = q; | |
79 | q = mempcpy(q, subject, subject_len); | |
80 | *q = '\0'; | |
81 | return 0; | |
82 | } | |
83 | ||
84 | static void free_message(struct commit_message *msg) | |
85 | { | |
86 | free(msg->parent_label); | |
87 | free(msg->reencoded_message); | |
88 | } | |
89 | ||
90 | static char *get_encoding(const char *message) | |
91 | { | |
92 | const char *p = message, *eol; | |
93 | ||
94 | while (*p && *p != '\n') { | |
95 | for (eol = p + 1; *eol && *eol != '\n'; eol++) | |
96 | ; /* do nothing */ | |
97 | if (!prefixcmp(p, "encoding ")) { | |
98 | char *result = xmalloc(eol - 8 - p); | |
99 | strlcpy(result, p + 9, eol - 8 - p); | |
100 | return result; | |
101 | } | |
102 | p = eol; | |
103 | if (*p == '\n') | |
104 | p++; | |
105 | } | |
106 | return NULL; | |
107 | } | |
108 | ||
109 | static void write_cherry_pick_head(struct commit *commit, const char *pseudoref) | |
110 | { | |
111 | const char *filename; | |
112 | int fd; | |
113 | struct strbuf buf = STRBUF_INIT; | |
114 | ||
115 | strbuf_addf(&buf, "%s\n", sha1_to_hex(commit->object.sha1)); | |
116 | ||
117 | filename = git_path("%s", pseudoref); | |
118 | fd = open(filename, O_WRONLY | O_CREAT, 0666); | |
119 | if (fd < 0) | |
120 | die_errno(_("Could not open '%s' for writing"), filename); | |
121 | if (write_in_full(fd, buf.buf, buf.len) != buf.len || close(fd)) | |
122 | die_errno(_("Could not write to '%s'"), filename); | |
123 | strbuf_release(&buf); | |
124 | } | |
125 | ||
126 | static void print_advice(int show_hint) | |
127 | { | |
128 | char *msg = getenv("GIT_CHERRY_PICK_HELP"); | |
129 | ||
130 | if (msg) { | |
131 | fprintf(stderr, "%s\n", msg); | |
132 | /* | |
133 | * A conflict has occured but the porcelain | |
134 | * (typically rebase --interactive) wants to take care | |
135 | * of the commit itself so remove CHERRY_PICK_HEAD | |
136 | */ | |
137 | unlink(git_path("CHERRY_PICK_HEAD")); | |
138 | return; | |
139 | } | |
140 | ||
7010146f JH |
141 | if (show_hint) |
142 | advise(_("after resolving the conflicts, mark the corrected paths\n" | |
143 | "with 'git add <paths>' or 'git rm <paths>'\n" | |
144 | "and commit the result with 'git commit'")); | |
043a4492 RR |
145 | } |
146 | ||
147 | static void write_message(struct strbuf *msgbuf, const char *filename) | |
148 | { | |
149 | static struct lock_file msg_file; | |
150 | ||
151 | int msg_fd = hold_lock_file_for_update(&msg_file, filename, | |
152 | LOCK_DIE_ON_ERROR); | |
153 | if (write_in_full(msg_fd, msgbuf->buf, msgbuf->len) < 0) | |
154 | die_errno(_("Could not write to %s"), filename); | |
155 | strbuf_release(msgbuf); | |
156 | if (commit_lock_file(&msg_file) < 0) | |
157 | die(_("Error wrapping up %s"), filename); | |
158 | } | |
159 | ||
160 | static struct tree *empty_tree(void) | |
161 | { | |
162 | return lookup_tree((const unsigned char *)EMPTY_TREE_SHA1_BIN); | |
163 | } | |
164 | ||
165 | static int error_dirty_index(struct replay_opts *opts) | |
166 | { | |
167 | if (read_cache_unmerged()) | |
168 | return error_resolve_conflict(action_name(opts)); | |
169 | ||
170 | /* Different translation strings for cherry-pick and revert */ | |
171 | if (opts->action == REPLAY_PICK) | |
172 | error(_("Your local changes would be overwritten by cherry-pick.")); | |
173 | else | |
174 | error(_("Your local changes would be overwritten by revert.")); | |
175 | ||
176 | if (advice_commit_before_merge) | |
177 | advise(_("Commit your changes or stash them to proceed.")); | |
178 | return -1; | |
179 | } | |
180 | ||
181 | static int fast_forward_to(const unsigned char *to, const unsigned char *from) | |
182 | { | |
183 | struct ref_lock *ref_lock; | |
184 | ||
185 | read_cache(); | |
186 | if (checkout_fast_forward(from, to)) | |
187 | exit(1); /* the callee should have complained already */ | |
188 | ref_lock = lock_any_ref_for_update("HEAD", from, 0); | |
189 | return write_ref_sha1(ref_lock, to, "cherry-pick"); | |
190 | } | |
191 | ||
192 | static int do_recursive_merge(struct commit *base, struct commit *next, | |
193 | const char *base_label, const char *next_label, | |
194 | unsigned char *head, struct strbuf *msgbuf, | |
195 | struct replay_opts *opts) | |
196 | { | |
197 | struct merge_options o; | |
198 | struct tree *result, *next_tree, *base_tree, *head_tree; | |
199 | int clean, index_fd; | |
200 | const char **xopt; | |
201 | static struct lock_file index_lock; | |
202 | ||
203 | index_fd = hold_locked_index(&index_lock, 1); | |
204 | ||
205 | read_cache(); | |
206 | ||
207 | init_merge_options(&o); | |
208 | o.ancestor = base ? base_label : "(empty tree)"; | |
209 | o.branch1 = "HEAD"; | |
210 | o.branch2 = next ? next_label : "(empty tree)"; | |
211 | ||
212 | head_tree = parse_tree_indirect(head); | |
213 | next_tree = next ? next->tree : empty_tree(); | |
214 | base_tree = base ? base->tree : empty_tree(); | |
215 | ||
216 | for (xopt = opts->xopts; xopt != opts->xopts + opts->xopts_nr; xopt++) | |
217 | parse_merge_opt(&o, *xopt); | |
218 | ||
219 | clean = merge_trees(&o, | |
220 | head_tree, | |
221 | next_tree, base_tree, &result); | |
222 | ||
223 | if (active_cache_changed && | |
224 | (write_cache(index_fd, active_cache, active_nr) || | |
225 | commit_locked_index(&index_lock))) | |
226 | /* TRANSLATORS: %s will be "revert" or "cherry-pick" */ | |
227 | die(_("%s: Unable to write new index file"), action_name(opts)); | |
228 | rollback_lock_file(&index_lock); | |
229 | ||
230 | if (!clean) { | |
231 | int i; | |
232 | strbuf_addstr(msgbuf, "\nConflicts:\n\n"); | |
233 | for (i = 0; i < active_nr;) { | |
234 | struct cache_entry *ce = active_cache[i++]; | |
235 | if (ce_stage(ce)) { | |
236 | strbuf_addch(msgbuf, '\t'); | |
237 | strbuf_addstr(msgbuf, ce->name); | |
238 | strbuf_addch(msgbuf, '\n'); | |
239 | while (i < active_nr && !strcmp(ce->name, | |
240 | active_cache[i]->name)) | |
241 | i++; | |
242 | } | |
243 | } | |
244 | } | |
245 | ||
246 | return !clean; | |
247 | } | |
248 | ||
249 | /* | |
250 | * If we are cherry-pick, and if the merge did not result in | |
251 | * hand-editing, we will hit this commit and inherit the original | |
252 | * author date and name. | |
253 | * If we are revert, or if our cherry-pick results in a hand merge, | |
254 | * we had better say that the current user is responsible for that. | |
255 | */ | |
256 | static int run_git_commit(const char *defmsg, struct replay_opts *opts) | |
257 | { | |
258 | /* 6 is max possible length of our args array including NULL */ | |
259 | const char *args[6]; | |
260 | int i = 0; | |
261 | ||
262 | args[i++] = "commit"; | |
263 | args[i++] = "-n"; | |
264 | if (opts->signoff) | |
265 | args[i++] = "-s"; | |
266 | if (!opts->edit) { | |
267 | args[i++] = "-F"; | |
268 | args[i++] = defmsg; | |
269 | } | |
270 | args[i] = NULL; | |
271 | ||
272 | return run_command_v_opt(args, RUN_GIT_CMD); | |
273 | } | |
274 | ||
275 | static int do_pick_commit(struct commit *commit, struct replay_opts *opts) | |
276 | { | |
277 | unsigned char head[20]; | |
278 | struct commit *base, *next, *parent; | |
279 | const char *base_label, *next_label; | |
280 | struct commit_message msg = { NULL, NULL, NULL, NULL, NULL }; | |
281 | char *defmsg = NULL; | |
282 | struct strbuf msgbuf = STRBUF_INIT; | |
283 | int res; | |
284 | ||
285 | if (opts->no_commit) { | |
286 | /* | |
287 | * We do not intend to commit immediately. We just want to | |
288 | * merge the differences in, so let's compute the tree | |
289 | * that represents the "current" state for merge-recursive | |
290 | * to work on. | |
291 | */ | |
292 | if (write_cache_as_tree(head, 0, NULL)) | |
293 | die (_("Your index file is unmerged.")); | |
294 | } else { | |
295 | if (get_sha1("HEAD", head)) | |
296 | return error(_("You do not have a valid HEAD")); | |
297 | if (index_differs_from("HEAD", 0)) | |
298 | return error_dirty_index(opts); | |
299 | } | |
300 | discard_cache(); | |
301 | ||
302 | if (!commit->parents) { | |
303 | parent = NULL; | |
304 | } | |
305 | else if (commit->parents->next) { | |
306 | /* Reverting or cherry-picking a merge commit */ | |
307 | int cnt; | |
308 | struct commit_list *p; | |
309 | ||
310 | if (!opts->mainline) | |
311 | return error(_("Commit %s is a merge but no -m option was given."), | |
312 | sha1_to_hex(commit->object.sha1)); | |
313 | ||
314 | for (cnt = 1, p = commit->parents; | |
315 | cnt != opts->mainline && p; | |
316 | cnt++) | |
317 | p = p->next; | |
318 | if (cnt != opts->mainline || !p) | |
319 | return error(_("Commit %s does not have parent %d"), | |
320 | sha1_to_hex(commit->object.sha1), opts->mainline); | |
321 | parent = p->item; | |
322 | } else if (0 < opts->mainline) | |
323 | return error(_("Mainline was specified but commit %s is not a merge."), | |
324 | sha1_to_hex(commit->object.sha1)); | |
325 | else | |
326 | parent = commit->parents->item; | |
327 | ||
328 | if (opts->allow_ff && parent && !hashcmp(parent->object.sha1, head)) | |
329 | return fast_forward_to(commit->object.sha1, head); | |
330 | ||
331 | if (parent && parse_commit(parent) < 0) | |
332 | /* TRANSLATORS: The first %s will be "revert" or | |
333 | "cherry-pick", the second %s a SHA1 */ | |
334 | return error(_("%s: cannot parse parent commit %s"), | |
335 | action_name(opts), sha1_to_hex(parent->object.sha1)); | |
336 | ||
337 | if (get_message(commit, &msg) != 0) | |
338 | return error(_("Cannot get commit message for %s"), | |
339 | sha1_to_hex(commit->object.sha1)); | |
340 | ||
341 | /* | |
342 | * "commit" is an existing commit. We would want to apply | |
343 | * the difference it introduces since its first parent "prev" | |
344 | * on top of the current HEAD if we are cherry-pick. Or the | |
345 | * reverse of it if we are revert. | |
346 | */ | |
347 | ||
348 | defmsg = git_pathdup("MERGE_MSG"); | |
349 | ||
350 | if (opts->action == REPLAY_REVERT) { | |
351 | base = commit; | |
352 | base_label = msg.label; | |
353 | next = parent; | |
354 | next_label = msg.parent_label; | |
355 | strbuf_addstr(&msgbuf, "Revert \""); | |
356 | strbuf_addstr(&msgbuf, msg.subject); | |
357 | strbuf_addstr(&msgbuf, "\"\n\nThis reverts commit "); | |
358 | strbuf_addstr(&msgbuf, sha1_to_hex(commit->object.sha1)); | |
359 | ||
360 | if (commit->parents && commit->parents->next) { | |
361 | strbuf_addstr(&msgbuf, ", reversing\nchanges made to "); | |
362 | strbuf_addstr(&msgbuf, sha1_to_hex(parent->object.sha1)); | |
363 | } | |
364 | strbuf_addstr(&msgbuf, ".\n"); | |
365 | } else { | |
366 | const char *p; | |
367 | ||
368 | base = parent; | |
369 | base_label = msg.parent_label; | |
370 | next = commit; | |
371 | next_label = msg.label; | |
372 | ||
373 | /* | |
374 | * Append the commit log message to msgbuf; it starts | |
375 | * after the tree, parent, author, committer | |
376 | * information followed by "\n\n". | |
377 | */ | |
378 | p = strstr(msg.message, "\n\n"); | |
379 | if (p) { | |
380 | p += 2; | |
381 | strbuf_addstr(&msgbuf, p); | |
382 | } | |
383 | ||
384 | if (opts->record_origin) { | |
385 | strbuf_addstr(&msgbuf, "(cherry picked from commit "); | |
386 | strbuf_addstr(&msgbuf, sha1_to_hex(commit->object.sha1)); | |
387 | strbuf_addstr(&msgbuf, ")\n"); | |
388 | } | |
389 | } | |
390 | ||
391 | if (!opts->strategy || !strcmp(opts->strategy, "recursive") || opts->action == REPLAY_REVERT) { | |
392 | res = do_recursive_merge(base, next, base_label, next_label, | |
393 | head, &msgbuf, opts); | |
394 | write_message(&msgbuf, defmsg); | |
395 | } else { | |
396 | struct commit_list *common = NULL; | |
397 | struct commit_list *remotes = NULL; | |
398 | ||
399 | write_message(&msgbuf, defmsg); | |
400 | ||
401 | commit_list_insert(base, &common); | |
402 | commit_list_insert(next, &remotes); | |
403 | res = try_merge_command(opts->strategy, opts->xopts_nr, opts->xopts, | |
404 | common, sha1_to_hex(head), remotes); | |
405 | free_commit_list(common); | |
406 | free_commit_list(remotes); | |
407 | } | |
408 | ||
409 | /* | |
410 | * If the merge was clean or if it failed due to conflict, we write | |
411 | * CHERRY_PICK_HEAD for the subsequent invocation of commit to use. | |
412 | * However, if the merge did not even start, then we don't want to | |
413 | * write it at all. | |
414 | */ | |
415 | if (opts->action == REPLAY_PICK && !opts->no_commit && (res == 0 || res == 1)) | |
416 | write_cherry_pick_head(commit, "CHERRY_PICK_HEAD"); | |
417 | if (opts->action == REPLAY_REVERT && ((opts->no_commit && res == 0) || res == 1)) | |
418 | write_cherry_pick_head(commit, "REVERT_HEAD"); | |
419 | ||
420 | if (res) { | |
421 | error(opts->action == REPLAY_REVERT | |
422 | ? _("could not revert %s... %s") | |
423 | : _("could not apply %s... %s"), | |
424 | find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV), | |
425 | msg.subject); | |
426 | print_advice(res == 1); | |
427 | rerere(opts->allow_rerere_auto); | |
428 | } else { | |
429 | if (!opts->no_commit) | |
430 | res = run_git_commit(defmsg, opts); | |
431 | } | |
432 | ||
433 | free_message(&msg); | |
434 | free(defmsg); | |
435 | ||
436 | return res; | |
437 | } | |
438 | ||
439 | static void prepare_revs(struct replay_opts *opts) | |
440 | { | |
441 | if (opts->action != REPLAY_REVERT) | |
442 | opts->revs->reverse ^= 1; | |
443 | ||
444 | if (prepare_revision_walk(opts->revs)) | |
445 | die(_("revision walk setup failed")); | |
446 | ||
447 | if (!opts->revs->commits) | |
448 | die(_("empty commit set passed")); | |
449 | } | |
450 | ||
451 | static void read_and_refresh_cache(struct replay_opts *opts) | |
452 | { | |
453 | static struct lock_file index_lock; | |
454 | int index_fd = hold_locked_index(&index_lock, 0); | |
455 | if (read_index_preload(&the_index, NULL) < 0) | |
456 | die(_("git %s: failed to read the index"), action_name(opts)); | |
457 | refresh_index(&the_index, REFRESH_QUIET|REFRESH_UNMERGED, NULL, NULL, NULL); | |
458 | if (the_index.cache_changed) { | |
459 | if (write_index(&the_index, index_fd) || | |
460 | commit_locked_index(&index_lock)) | |
461 | die(_("git %s: failed to refresh the index"), action_name(opts)); | |
462 | } | |
463 | rollback_lock_file(&index_lock); | |
464 | } | |
465 | ||
466 | /* | |
467 | * Append a commit to the end of the commit_list. | |
468 | * | |
469 | * next starts by pointing to the variable that holds the head of an | |
470 | * empty commit_list, and is updated to point to the "next" field of | |
471 | * the last item on the list as new commits are appended. | |
472 | * | |
473 | * Usage example: | |
474 | * | |
475 | * struct commit_list *list; | |
476 | * struct commit_list **next = &list; | |
477 | * | |
478 | * next = commit_list_append(c1, next); | |
479 | * next = commit_list_append(c2, next); | |
480 | * assert(commit_list_count(list) == 2); | |
481 | * return list; | |
482 | */ | |
483 | static struct commit_list **commit_list_append(struct commit *commit, | |
484 | struct commit_list **next) | |
485 | { | |
486 | struct commit_list *new = xmalloc(sizeof(struct commit_list)); | |
487 | new->item = commit; | |
488 | *next = new; | |
489 | new->next = NULL; | |
490 | return &new->next; | |
491 | } | |
492 | ||
493 | static int format_todo(struct strbuf *buf, struct commit_list *todo_list, | |
494 | struct replay_opts *opts) | |
495 | { | |
496 | struct commit_list *cur = NULL; | |
497 | const char *sha1_abbrev = NULL; | |
498 | const char *action_str = opts->action == REPLAY_REVERT ? "revert" : "pick"; | |
499 | const char *subject; | |
500 | int subject_len; | |
501 | ||
502 | for (cur = todo_list; cur; cur = cur->next) { | |
503 | sha1_abbrev = find_unique_abbrev(cur->item->object.sha1, DEFAULT_ABBREV); | |
504 | subject_len = find_commit_subject(cur->item->buffer, &subject); | |
505 | strbuf_addf(buf, "%s %s %.*s\n", action_str, sha1_abbrev, | |
506 | subject_len, subject); | |
507 | } | |
508 | return 0; | |
509 | } | |
510 | ||
511 | static struct commit *parse_insn_line(char *bol, char *eol, struct replay_opts *opts) | |
512 | { | |
513 | unsigned char commit_sha1[20]; | |
514 | enum replay_action action; | |
515 | char *end_of_object_name; | |
516 | int saved, status, padding; | |
517 | ||
518 | if (!prefixcmp(bol, "pick")) { | |
519 | action = REPLAY_PICK; | |
520 | bol += strlen("pick"); | |
521 | } else if (!prefixcmp(bol, "revert")) { | |
522 | action = REPLAY_REVERT; | |
523 | bol += strlen("revert"); | |
524 | } else | |
525 | return NULL; | |
526 | ||
527 | /* Eat up extra spaces/ tabs before object name */ | |
528 | padding = strspn(bol, " \t"); | |
529 | if (!padding) | |
530 | return NULL; | |
531 | bol += padding; | |
532 | ||
533 | end_of_object_name = bol + strcspn(bol, " \t\n"); | |
534 | saved = *end_of_object_name; | |
535 | *end_of_object_name = '\0'; | |
536 | status = get_sha1(bol, commit_sha1); | |
537 | *end_of_object_name = saved; | |
538 | ||
539 | /* | |
540 | * Verify that the action matches up with the one in | |
541 | * opts; we don't support arbitrary instructions | |
542 | */ | |
543 | if (action != opts->action) { | |
544 | const char *action_str; | |
545 | action_str = action == REPLAY_REVERT ? "revert" : "cherry-pick"; | |
546 | error(_("Cannot %s during a %s"), action_str, action_name(opts)); | |
547 | return NULL; | |
548 | } | |
549 | ||
550 | if (status < 0) | |
551 | return NULL; | |
552 | ||
553 | return lookup_commit_reference(commit_sha1); | |
554 | } | |
555 | ||
556 | static int parse_insn_buffer(char *buf, struct commit_list **todo_list, | |
557 | struct replay_opts *opts) | |
558 | { | |
559 | struct commit_list **next = todo_list; | |
560 | struct commit *commit; | |
561 | char *p = buf; | |
562 | int i; | |
563 | ||
564 | for (i = 1; *p; i++) { | |
565 | char *eol = strchrnul(p, '\n'); | |
566 | commit = parse_insn_line(p, eol, opts); | |
567 | if (!commit) | |
568 | return error(_("Could not parse line %d."), i); | |
569 | next = commit_list_append(commit, next); | |
570 | p = *eol ? eol + 1 : eol; | |
571 | } | |
572 | if (!*todo_list) | |
573 | return error(_("No commits parsed.")); | |
574 | return 0; | |
575 | } | |
576 | ||
577 | static void read_populate_todo(struct commit_list **todo_list, | |
578 | struct replay_opts *opts) | |
579 | { | |
580 | const char *todo_file = git_path(SEQ_TODO_FILE); | |
581 | struct strbuf buf = STRBUF_INIT; | |
582 | int fd, res; | |
583 | ||
584 | fd = open(todo_file, O_RDONLY); | |
585 | if (fd < 0) | |
586 | die_errno(_("Could not open %s"), todo_file); | |
587 | if (strbuf_read(&buf, fd, 0) < 0) { | |
588 | close(fd); | |
589 | strbuf_release(&buf); | |
590 | die(_("Could not read %s."), todo_file); | |
591 | } | |
592 | close(fd); | |
593 | ||
594 | res = parse_insn_buffer(buf.buf, todo_list, opts); | |
595 | strbuf_release(&buf); | |
596 | if (res) | |
597 | die(_("Unusable instruction sheet: %s"), todo_file); | |
598 | } | |
599 | ||
600 | static int populate_opts_cb(const char *key, const char *value, void *data) | |
601 | { | |
602 | struct replay_opts *opts = data; | |
603 | int error_flag = 1; | |
604 | ||
605 | if (!value) | |
606 | error_flag = 0; | |
607 | else if (!strcmp(key, "options.no-commit")) | |
608 | opts->no_commit = git_config_bool_or_int(key, value, &error_flag); | |
609 | else if (!strcmp(key, "options.edit")) | |
610 | opts->edit = git_config_bool_or_int(key, value, &error_flag); | |
611 | else if (!strcmp(key, "options.signoff")) | |
612 | opts->signoff = git_config_bool_or_int(key, value, &error_flag); | |
613 | else if (!strcmp(key, "options.record-origin")) | |
614 | opts->record_origin = git_config_bool_or_int(key, value, &error_flag); | |
615 | else if (!strcmp(key, "options.allow-ff")) | |
616 | opts->allow_ff = git_config_bool_or_int(key, value, &error_flag); | |
617 | else if (!strcmp(key, "options.mainline")) | |
618 | opts->mainline = git_config_int(key, value); | |
619 | else if (!strcmp(key, "options.strategy")) | |
620 | git_config_string(&opts->strategy, key, value); | |
621 | else if (!strcmp(key, "options.strategy-option")) { | |
622 | ALLOC_GROW(opts->xopts, opts->xopts_nr + 1, opts->xopts_alloc); | |
623 | opts->xopts[opts->xopts_nr++] = xstrdup(value); | |
624 | } else | |
625 | return error(_("Invalid key: %s"), key); | |
626 | ||
627 | if (!error_flag) | |
628 | return error(_("Invalid value for %s: %s"), key, value); | |
629 | ||
630 | return 0; | |
631 | } | |
632 | ||
633 | static void read_populate_opts(struct replay_opts **opts_ptr) | |
634 | { | |
635 | const char *opts_file = git_path(SEQ_OPTS_FILE); | |
636 | ||
637 | if (!file_exists(opts_file)) | |
638 | return; | |
639 | if (git_config_from_file(populate_opts_cb, opts_file, *opts_ptr) < 0) | |
640 | die(_("Malformed options sheet: %s"), opts_file); | |
641 | } | |
642 | ||
643 | static void walk_revs_populate_todo(struct commit_list **todo_list, | |
644 | struct replay_opts *opts) | |
645 | { | |
646 | struct commit *commit; | |
647 | struct commit_list **next; | |
648 | ||
649 | prepare_revs(opts); | |
650 | ||
651 | next = todo_list; | |
652 | while ((commit = get_revision(opts->revs))) | |
653 | next = commit_list_append(commit, next); | |
654 | } | |
655 | ||
656 | static int create_seq_dir(void) | |
657 | { | |
658 | const char *seq_dir = git_path(SEQ_DIR); | |
659 | ||
660 | if (file_exists(seq_dir)) { | |
661 | error(_("a cherry-pick or revert is already in progress")); | |
662 | advise(_("try \"git cherry-pick (--continue | --quit | --abort)\"")); | |
663 | return -1; | |
664 | } | |
665 | else if (mkdir(seq_dir, 0777) < 0) | |
666 | die_errno(_("Could not create sequencer directory %s"), seq_dir); | |
667 | return 0; | |
668 | } | |
669 | ||
670 | static void save_head(const char *head) | |
671 | { | |
672 | const char *head_file = git_path(SEQ_HEAD_FILE); | |
673 | static struct lock_file head_lock; | |
674 | struct strbuf buf = STRBUF_INIT; | |
675 | int fd; | |
676 | ||
677 | fd = hold_lock_file_for_update(&head_lock, head_file, LOCK_DIE_ON_ERROR); | |
678 | strbuf_addf(&buf, "%s\n", head); | |
679 | if (write_in_full(fd, buf.buf, buf.len) < 0) | |
680 | die_errno(_("Could not write to %s"), head_file); | |
681 | if (commit_lock_file(&head_lock) < 0) | |
682 | die(_("Error wrapping up %s."), head_file); | |
683 | } | |
684 | ||
685 | static int reset_for_rollback(const unsigned char *sha1) | |
686 | { | |
687 | const char *argv[4]; /* reset --merge <arg> + NULL */ | |
688 | argv[0] = "reset"; | |
689 | argv[1] = "--merge"; | |
690 | argv[2] = sha1_to_hex(sha1); | |
691 | argv[3] = NULL; | |
692 | return run_command_v_opt(argv, RUN_GIT_CMD); | |
693 | } | |
694 | ||
695 | static int rollback_single_pick(void) | |
696 | { | |
697 | unsigned char head_sha1[20]; | |
698 | ||
699 | if (!file_exists(git_path("CHERRY_PICK_HEAD")) && | |
700 | !file_exists(git_path("REVERT_HEAD"))) | |
701 | return error(_("no cherry-pick or revert in progress")); | |
702 | if (read_ref_full("HEAD", head_sha1, 0, NULL)) | |
703 | return error(_("cannot resolve HEAD")); | |
704 | if (is_null_sha1(head_sha1)) | |
705 | return error(_("cannot abort from a branch yet to be born")); | |
706 | return reset_for_rollback(head_sha1); | |
707 | } | |
708 | ||
709 | static int sequencer_rollback(struct replay_opts *opts) | |
710 | { | |
711 | const char *filename; | |
712 | FILE *f; | |
713 | unsigned char sha1[20]; | |
714 | struct strbuf buf = STRBUF_INIT; | |
715 | ||
716 | filename = git_path(SEQ_HEAD_FILE); | |
717 | f = fopen(filename, "r"); | |
718 | if (!f && errno == ENOENT) { | |
719 | /* | |
720 | * There is no multiple-cherry-pick in progress. | |
721 | * If CHERRY_PICK_HEAD or REVERT_HEAD indicates | |
722 | * a single-cherry-pick in progress, abort that. | |
723 | */ | |
724 | return rollback_single_pick(); | |
725 | } | |
726 | if (!f) | |
727 | return error(_("cannot open %s: %s"), filename, | |
728 | strerror(errno)); | |
729 | if (strbuf_getline(&buf, f, '\n')) { | |
730 | error(_("cannot read %s: %s"), filename, ferror(f) ? | |
731 | strerror(errno) : _("unexpected end of file")); | |
732 | fclose(f); | |
733 | goto fail; | |
734 | } | |
735 | fclose(f); | |
736 | if (get_sha1_hex(buf.buf, sha1) || buf.buf[40] != '\0') { | |
737 | error(_("stored pre-cherry-pick HEAD file '%s' is corrupt"), | |
738 | filename); | |
739 | goto fail; | |
740 | } | |
741 | if (reset_for_rollback(sha1)) | |
742 | goto fail; | |
743 | remove_sequencer_state(); | |
744 | strbuf_release(&buf); | |
745 | return 0; | |
746 | fail: | |
747 | strbuf_release(&buf); | |
748 | return -1; | |
749 | } | |
750 | ||
751 | static void save_todo(struct commit_list *todo_list, struct replay_opts *opts) | |
752 | { | |
753 | const char *todo_file = git_path(SEQ_TODO_FILE); | |
754 | static struct lock_file todo_lock; | |
755 | struct strbuf buf = STRBUF_INIT; | |
756 | int fd; | |
757 | ||
758 | fd = hold_lock_file_for_update(&todo_lock, todo_file, LOCK_DIE_ON_ERROR); | |
759 | if (format_todo(&buf, todo_list, opts) < 0) | |
760 | die(_("Could not format %s."), todo_file); | |
761 | if (write_in_full(fd, buf.buf, buf.len) < 0) { | |
762 | strbuf_release(&buf); | |
763 | die_errno(_("Could not write to %s"), todo_file); | |
764 | } | |
765 | if (commit_lock_file(&todo_lock) < 0) { | |
766 | strbuf_release(&buf); | |
767 | die(_("Error wrapping up %s."), todo_file); | |
768 | } | |
769 | strbuf_release(&buf); | |
770 | } | |
771 | ||
772 | static void save_opts(struct replay_opts *opts) | |
773 | { | |
774 | const char *opts_file = git_path(SEQ_OPTS_FILE); | |
775 | ||
776 | if (opts->no_commit) | |
777 | git_config_set_in_file(opts_file, "options.no-commit", "true"); | |
778 | if (opts->edit) | |
779 | git_config_set_in_file(opts_file, "options.edit", "true"); | |
780 | if (opts->signoff) | |
781 | git_config_set_in_file(opts_file, "options.signoff", "true"); | |
782 | if (opts->record_origin) | |
783 | git_config_set_in_file(opts_file, "options.record-origin", "true"); | |
784 | if (opts->allow_ff) | |
785 | git_config_set_in_file(opts_file, "options.allow-ff", "true"); | |
786 | if (opts->mainline) { | |
787 | struct strbuf buf = STRBUF_INIT; | |
788 | strbuf_addf(&buf, "%d", opts->mainline); | |
789 | git_config_set_in_file(opts_file, "options.mainline", buf.buf); | |
790 | strbuf_release(&buf); | |
791 | } | |
792 | if (opts->strategy) | |
793 | git_config_set_in_file(opts_file, "options.strategy", opts->strategy); | |
794 | if (opts->xopts) { | |
795 | int i; | |
796 | for (i = 0; i < opts->xopts_nr; i++) | |
797 | git_config_set_multivar_in_file(opts_file, | |
798 | "options.strategy-option", | |
799 | opts->xopts[i], "^$", 0); | |
800 | } | |
801 | } | |
802 | ||
803 | static int pick_commits(struct commit_list *todo_list, struct replay_opts *opts) | |
804 | { | |
805 | struct commit_list *cur; | |
806 | int res; | |
807 | ||
808 | setenv(GIT_REFLOG_ACTION, action_name(opts), 0); | |
809 | if (opts->allow_ff) | |
810 | assert(!(opts->signoff || opts->no_commit || | |
811 | opts->record_origin || opts->edit)); | |
812 | read_and_refresh_cache(opts); | |
813 | ||
814 | for (cur = todo_list; cur; cur = cur->next) { | |
815 | save_todo(cur, opts); | |
816 | res = do_pick_commit(cur->item, opts); | |
817 | if (res) | |
818 | return res; | |
819 | } | |
820 | ||
821 | /* | |
822 | * Sequence of picks finished successfully; cleanup by | |
823 | * removing the .git/sequencer directory | |
824 | */ | |
825 | remove_sequencer_state(); | |
826 | return 0; | |
827 | } | |
828 | ||
829 | static int continue_single_pick(void) | |
830 | { | |
831 | const char *argv[] = { "commit", NULL }; | |
832 | ||
833 | if (!file_exists(git_path("CHERRY_PICK_HEAD")) && | |
834 | !file_exists(git_path("REVERT_HEAD"))) | |
835 | return error(_("no cherry-pick or revert in progress")); | |
836 | return run_command_v_opt(argv, RUN_GIT_CMD); | |
837 | } | |
838 | ||
839 | static int sequencer_continue(struct replay_opts *opts) | |
840 | { | |
841 | struct commit_list *todo_list = NULL; | |
842 | ||
843 | if (!file_exists(git_path(SEQ_TODO_FILE))) | |
844 | return continue_single_pick(); | |
845 | read_populate_opts(&opts); | |
846 | read_populate_todo(&todo_list, opts); | |
847 | ||
848 | /* Verify that the conflict has been resolved */ | |
849 | if (file_exists(git_path("CHERRY_PICK_HEAD")) || | |
850 | file_exists(git_path("REVERT_HEAD"))) { | |
851 | int ret = continue_single_pick(); | |
852 | if (ret) | |
853 | return ret; | |
854 | } | |
855 | if (index_differs_from("HEAD", 0)) | |
856 | return error_dirty_index(opts); | |
857 | todo_list = todo_list->next; | |
858 | return pick_commits(todo_list, opts); | |
859 | } | |
860 | ||
861 | static int single_pick(struct commit *cmit, struct replay_opts *opts) | |
862 | { | |
863 | setenv(GIT_REFLOG_ACTION, action_name(opts), 0); | |
864 | return do_pick_commit(cmit, opts); | |
865 | } | |
866 | ||
867 | int sequencer_pick_revisions(struct replay_opts *opts) | |
868 | { | |
869 | struct commit_list *todo_list = NULL; | |
870 | unsigned char sha1[20]; | |
871 | ||
872 | if (opts->subcommand == REPLAY_NONE) | |
873 | assert(opts->revs); | |
874 | ||
875 | read_and_refresh_cache(opts); | |
876 | ||
877 | /* | |
878 | * Decide what to do depending on the arguments; a fresh | |
879 | * cherry-pick should be handled differently from an existing | |
880 | * one that is being continued | |
881 | */ | |
882 | if (opts->subcommand == REPLAY_REMOVE_STATE) { | |
883 | remove_sequencer_state(); | |
884 | return 0; | |
885 | } | |
886 | if (opts->subcommand == REPLAY_ROLLBACK) | |
887 | return sequencer_rollback(opts); | |
888 | if (opts->subcommand == REPLAY_CONTINUE) | |
889 | return sequencer_continue(opts); | |
890 | ||
891 | /* | |
892 | * If we were called as "git cherry-pick <commit>", just | |
893 | * cherry-pick/revert it, set CHERRY_PICK_HEAD / | |
894 | * REVERT_HEAD, and don't touch the sequencer state. | |
895 | * This means it is possible to cherry-pick in the middle | |
896 | * of a cherry-pick sequence. | |
897 | */ | |
898 | if (opts->revs->cmdline.nr == 1 && | |
899 | opts->revs->cmdline.rev->whence == REV_CMD_REV && | |
900 | opts->revs->no_walk && | |
901 | !opts->revs->cmdline.rev->flags) { | |
902 | struct commit *cmit; | |
903 | if (prepare_revision_walk(opts->revs)) | |
904 | die(_("revision walk setup failed")); | |
905 | cmit = get_revision(opts->revs); | |
906 | if (!cmit || get_revision(opts->revs)) | |
907 | die("BUG: expected exactly one commit from walk"); | |
908 | return single_pick(cmit, opts); | |
909 | } | |
910 | ||
911 | /* | |
912 | * Start a new cherry-pick/ revert sequence; but | |
913 | * first, make sure that an existing one isn't in | |
914 | * progress | |
915 | */ | |
916 | ||
917 | walk_revs_populate_todo(&todo_list, opts); | |
918 | if (create_seq_dir() < 0) | |
919 | return -1; | |
920 | if (get_sha1("HEAD", sha1)) { | |
921 | if (opts->action == REPLAY_REVERT) | |
922 | return error(_("Can't revert as initial commit")); | |
923 | return error(_("Can't cherry-pick into empty head")); | |
924 | } | |
925 | save_head(sha1_to_hex(sha1)); | |
926 | save_opts(opts); | |
927 | return pick_commits(todo_list, opts); | |
928 | } |