git-svn: make Git::SVN::Fetcher a separate file
[alt-git.git] / sequencer.c
blob3c384b94d24e3099cb149c66347386d1430fadef
1 #include "cache.h"
2 #include "sequencer.h"
3 #include "dir.h"
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 #include "argv-array.h"
18 #define GIT_REFLOG_ACTION "GIT_REFLOG_ACTION"
20 void remove_sequencer_state(void)
22 struct strbuf seq_dir = STRBUF_INIT;
24 strbuf_addf(&seq_dir, "%s", git_path(SEQ_DIR));
25 remove_dir_recursively(&seq_dir, 0);
26 strbuf_release(&seq_dir);
29 static const char *action_name(const struct replay_opts *opts)
31 return opts->action == REPLAY_REVERT ? "revert" : "cherry-pick";
34 static char *get_encoding(const char *message);
36 struct commit_message {
37 char *parent_label;
38 const char *label;
39 const char *subject;
40 char *reencoded_message;
41 const char *message;
44 static int get_message(struct commit *commit, struct commit_message *out)
46 const char *encoding;
47 const char *abbrev, *subject;
48 int abbrev_len, subject_len;
49 char *q;
51 if (!commit->buffer)
52 return -1;
53 encoding = get_encoding(commit->buffer);
54 if (!encoding)
55 encoding = "UTF-8";
56 if (!git_commit_encoding)
57 git_commit_encoding = "UTF-8";
59 out->reencoded_message = NULL;
60 out->message = commit->buffer;
61 if (strcmp(encoding, git_commit_encoding))
62 out->reencoded_message = reencode_string(commit->buffer,
63 git_commit_encoding, encoding);
64 if (out->reencoded_message)
65 out->message = out->reencoded_message;
67 abbrev = find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV);
68 abbrev_len = strlen(abbrev);
70 subject_len = find_commit_subject(out->message, &subject);
72 out->parent_label = xmalloc(strlen("parent of ") + abbrev_len +
73 strlen("... ") + subject_len + 1);
74 q = out->parent_label;
75 q = mempcpy(q, "parent of ", strlen("parent of "));
76 out->label = q;
77 q = mempcpy(q, abbrev, abbrev_len);
78 q = mempcpy(q, "... ", strlen("... "));
79 out->subject = q;
80 q = mempcpy(q, subject, subject_len);
81 *q = '\0';
82 return 0;
85 static void free_message(struct commit_message *msg)
87 free(msg->parent_label);
88 free(msg->reencoded_message);
91 static char *get_encoding(const char *message)
93 const char *p = message, *eol;
95 while (*p && *p != '\n') {
96 for (eol = p + 1; *eol && *eol != '\n'; eol++)
97 ; /* do nothing */
98 if (!prefixcmp(p, "encoding ")) {
99 char *result = xmalloc(eol - 8 - p);
100 strlcpy(result, p + 9, eol - 8 - p);
101 return result;
103 p = eol;
104 if (*p == '\n')
105 p++;
107 return NULL;
110 static void write_cherry_pick_head(struct commit *commit, const char *pseudoref)
112 const char *filename;
113 int fd;
114 struct strbuf buf = STRBUF_INIT;
116 strbuf_addf(&buf, "%s\n", sha1_to_hex(commit->object.sha1));
118 filename = git_path("%s", pseudoref);
119 fd = open(filename, O_WRONLY | O_CREAT, 0666);
120 if (fd < 0)
121 die_errno(_("Could not open '%s' for writing"), filename);
122 if (write_in_full(fd, buf.buf, buf.len) != buf.len || close(fd))
123 die_errno(_("Could not write to '%s'"), filename);
124 strbuf_release(&buf);
127 static void print_advice(int show_hint, struct replay_opts *opts)
129 char *msg = getenv("GIT_CHERRY_PICK_HELP");
131 if (msg) {
132 fprintf(stderr, "%s\n", msg);
134 * A conflict has occured but the porcelain
135 * (typically rebase --interactive) wants to take care
136 * of the commit itself so remove CHERRY_PICK_HEAD
138 unlink(git_path("CHERRY_PICK_HEAD"));
139 return;
142 if (show_hint) {
143 if (opts->no_commit)
144 advise(_("after resolving the conflicts, mark the corrected paths\n"
145 "with 'git add <paths>' or 'git rm <paths>'"));
146 else
147 advise(_("after resolving the conflicts, mark the corrected paths\n"
148 "with 'git add <paths>' or 'git rm <paths>'\n"
149 "and commit the result with 'git commit'"));
153 static void write_message(struct strbuf *msgbuf, const char *filename)
155 static struct lock_file msg_file;
157 int msg_fd = hold_lock_file_for_update(&msg_file, filename,
158 LOCK_DIE_ON_ERROR);
159 if (write_in_full(msg_fd, msgbuf->buf, msgbuf->len) < 0)
160 die_errno(_("Could not write to %s"), filename);
161 strbuf_release(msgbuf);
162 if (commit_lock_file(&msg_file) < 0)
163 die(_("Error wrapping up %s"), filename);
166 static struct tree *empty_tree(void)
168 return lookup_tree(EMPTY_TREE_SHA1_BIN);
171 static int error_dirty_index(struct replay_opts *opts)
173 if (read_cache_unmerged())
174 return error_resolve_conflict(action_name(opts));
176 /* Different translation strings for cherry-pick and revert */
177 if (opts->action == REPLAY_PICK)
178 error(_("Your local changes would be overwritten by cherry-pick."));
179 else
180 error(_("Your local changes would be overwritten by revert."));
182 if (advice_commit_before_merge)
183 advise(_("Commit your changes or stash them to proceed."));
184 return -1;
187 static int fast_forward_to(const unsigned char *to, const unsigned char *from)
189 struct ref_lock *ref_lock;
191 read_cache();
192 if (checkout_fast_forward(from, to))
193 exit(1); /* the callee should have complained already */
194 ref_lock = lock_any_ref_for_update("HEAD", from, 0);
195 return write_ref_sha1(ref_lock, to, "cherry-pick");
198 static int do_recursive_merge(struct commit *base, struct commit *next,
199 const char *base_label, const char *next_label,
200 unsigned char *head, struct strbuf *msgbuf,
201 struct replay_opts *opts)
203 struct merge_options o;
204 struct tree *result, *next_tree, *base_tree, *head_tree;
205 int clean, index_fd;
206 const char **xopt;
207 static struct lock_file index_lock;
209 index_fd = hold_locked_index(&index_lock, 1);
211 read_cache();
213 init_merge_options(&o);
214 o.ancestor = base ? base_label : "(empty tree)";
215 o.branch1 = "HEAD";
216 o.branch2 = next ? next_label : "(empty tree)";
218 head_tree = parse_tree_indirect(head);
219 next_tree = next ? next->tree : empty_tree();
220 base_tree = base ? base->tree : empty_tree();
222 for (xopt = opts->xopts; xopt != opts->xopts + opts->xopts_nr; xopt++)
223 parse_merge_opt(&o, *xopt);
225 clean = merge_trees(&o,
226 head_tree,
227 next_tree, base_tree, &result);
229 if (active_cache_changed &&
230 (write_cache(index_fd, active_cache, active_nr) ||
231 commit_locked_index(&index_lock)))
232 /* TRANSLATORS: %s will be "revert" or "cherry-pick" */
233 die(_("%s: Unable to write new index file"), action_name(opts));
234 rollback_lock_file(&index_lock);
236 if (!clean) {
237 int i;
238 strbuf_addstr(msgbuf, "\nConflicts:\n");
239 for (i = 0; i < active_nr;) {
240 struct cache_entry *ce = active_cache[i++];
241 if (ce_stage(ce)) {
242 strbuf_addch(msgbuf, '\t');
243 strbuf_addstr(msgbuf, ce->name);
244 strbuf_addch(msgbuf, '\n');
245 while (i < active_nr && !strcmp(ce->name,
246 active_cache[i]->name))
247 i++;
252 return !clean;
255 static int is_index_unchanged(void)
257 unsigned char head_sha1[20];
258 struct commit *head_commit;
260 if (!resolve_ref_unsafe("HEAD", head_sha1, 1, NULL))
261 return error(_("Could not resolve HEAD commit\n"));
263 head_commit = lookup_commit(head_sha1);
266 * If head_commit is NULL, check_commit, called from
267 * lookup_commit, would have indicated that head_commit is not
268 * a commit object already. parse_commit() will return failure
269 * without further complaints in such a case. Otherwise, if
270 * the commit is invalid, parse_commit() will complain. So
271 * there is nothing for us to say here. Just return failure.
273 if (parse_commit(head_commit))
274 return -1;
276 if (!active_cache_tree)
277 active_cache_tree = cache_tree();
279 if (!cache_tree_fully_valid(active_cache_tree))
280 if (cache_tree_update(active_cache_tree, active_cache,
281 active_nr, 0))
282 return error(_("Unable to update cache tree\n"));
284 return !hashcmp(active_cache_tree->sha1, head_commit->tree->object.sha1);
288 * If we are cherry-pick, and if the merge did not result in
289 * hand-editing, we will hit this commit and inherit the original
290 * author date and name.
291 * If we are revert, or if our cherry-pick results in a hand merge,
292 * we had better say that the current user is responsible for that.
294 static int run_git_commit(const char *defmsg, struct replay_opts *opts)
296 struct argv_array array;
297 int rc;
299 argv_array_init(&array);
300 argv_array_push(&array, "commit");
301 argv_array_push(&array, "-n");
303 if (opts->signoff)
304 argv_array_push(&array, "-s");
305 if (!opts->edit) {
306 argv_array_push(&array, "-F");
307 argv_array_push(&array, defmsg);
310 if (opts->allow_empty)
311 argv_array_push(&array, "--allow-empty");
313 rc = run_command_v_opt(array.argv, RUN_GIT_CMD);
314 argv_array_clear(&array);
315 return rc;
318 static int is_original_commit_empty(struct commit *commit)
320 const unsigned char *ptree_sha1;
322 if (parse_commit(commit))
323 return error(_("Could not parse commit %s\n"),
324 sha1_to_hex(commit->object.sha1));
325 if (commit->parents) {
326 struct commit *parent = commit->parents->item;
327 if (parse_commit(parent))
328 return error(_("Could not parse parent commit %s\n"),
329 sha1_to_hex(parent->object.sha1));
330 ptree_sha1 = parent->tree->object.sha1;
331 } else {
332 ptree_sha1 = EMPTY_TREE_SHA1_BIN; /* commit is root */
335 return !hashcmp(ptree_sha1, commit->tree->object.sha1);
338 static int do_pick_commit(struct commit *commit, struct replay_opts *opts)
340 unsigned char head[20];
341 struct commit *base, *next, *parent;
342 const char *base_label, *next_label;
343 struct commit_message msg = { NULL, NULL, NULL, NULL, NULL };
344 char *defmsg = NULL;
345 struct strbuf msgbuf = STRBUF_INIT;
346 int res;
347 int empty_commit;
348 int index_unchanged;
350 if (opts->no_commit) {
352 * We do not intend to commit immediately. We just want to
353 * merge the differences in, so let's compute the tree
354 * that represents the "current" state for merge-recursive
355 * to work on.
357 if (write_cache_as_tree(head, 0, NULL))
358 die (_("Your index file is unmerged."));
359 } else {
360 if (get_sha1("HEAD", head))
361 return error(_("You do not have a valid HEAD"));
362 if (index_differs_from("HEAD", 0))
363 return error_dirty_index(opts);
365 discard_cache();
367 if (!commit->parents) {
368 parent = NULL;
370 else if (commit->parents->next) {
371 /* Reverting or cherry-picking a merge commit */
372 int cnt;
373 struct commit_list *p;
375 if (!opts->mainline)
376 return error(_("Commit %s is a merge but no -m option was given."),
377 sha1_to_hex(commit->object.sha1));
379 for (cnt = 1, p = commit->parents;
380 cnt != opts->mainline && p;
381 cnt++)
382 p = p->next;
383 if (cnt != opts->mainline || !p)
384 return error(_("Commit %s does not have parent %d"),
385 sha1_to_hex(commit->object.sha1), opts->mainline);
386 parent = p->item;
387 } else if (0 < opts->mainline)
388 return error(_("Mainline was specified but commit %s is not a merge."),
389 sha1_to_hex(commit->object.sha1));
390 else
391 parent = commit->parents->item;
393 if (opts->allow_ff && parent && !hashcmp(parent->object.sha1, head))
394 return fast_forward_to(commit->object.sha1, head);
396 if (parent && parse_commit(parent) < 0)
397 /* TRANSLATORS: The first %s will be "revert" or
398 "cherry-pick", the second %s a SHA1 */
399 return error(_("%s: cannot parse parent commit %s"),
400 action_name(opts), sha1_to_hex(parent->object.sha1));
402 if (get_message(commit, &msg) != 0)
403 return error(_("Cannot get commit message for %s"),
404 sha1_to_hex(commit->object.sha1));
407 * "commit" is an existing commit. We would want to apply
408 * the difference it introduces since its first parent "prev"
409 * on top of the current HEAD if we are cherry-pick. Or the
410 * reverse of it if we are revert.
413 defmsg = git_pathdup("MERGE_MSG");
415 if (opts->action == REPLAY_REVERT) {
416 base = commit;
417 base_label = msg.label;
418 next = parent;
419 next_label = msg.parent_label;
420 strbuf_addstr(&msgbuf, "Revert \"");
421 strbuf_addstr(&msgbuf, msg.subject);
422 strbuf_addstr(&msgbuf, "\"\n\nThis reverts commit ");
423 strbuf_addstr(&msgbuf, sha1_to_hex(commit->object.sha1));
425 if (commit->parents && commit->parents->next) {
426 strbuf_addstr(&msgbuf, ", reversing\nchanges made to ");
427 strbuf_addstr(&msgbuf, sha1_to_hex(parent->object.sha1));
429 strbuf_addstr(&msgbuf, ".\n");
430 } else {
431 const char *p;
433 base = parent;
434 base_label = msg.parent_label;
435 next = commit;
436 next_label = msg.label;
439 * Append the commit log message to msgbuf; it starts
440 * after the tree, parent, author, committer
441 * information followed by "\n\n".
443 p = strstr(msg.message, "\n\n");
444 if (p) {
445 p += 2;
446 strbuf_addstr(&msgbuf, p);
449 if (opts->record_origin) {
450 strbuf_addstr(&msgbuf, "(cherry picked from commit ");
451 strbuf_addstr(&msgbuf, sha1_to_hex(commit->object.sha1));
452 strbuf_addstr(&msgbuf, ")\n");
456 if (!opts->strategy || !strcmp(opts->strategy, "recursive") || opts->action == REPLAY_REVERT) {
457 res = do_recursive_merge(base, next, base_label, next_label,
458 head, &msgbuf, opts);
459 write_message(&msgbuf, defmsg);
460 } else {
461 struct commit_list *common = NULL;
462 struct commit_list *remotes = NULL;
464 write_message(&msgbuf, defmsg);
466 commit_list_insert(base, &common);
467 commit_list_insert(next, &remotes);
468 res = try_merge_command(opts->strategy, opts->xopts_nr, opts->xopts,
469 common, sha1_to_hex(head), remotes);
470 free_commit_list(common);
471 free_commit_list(remotes);
474 empty_commit = is_original_commit_empty(commit);
475 if (empty_commit < 0)
476 return empty_commit;
479 * If the merge was clean or if it failed due to conflict, we write
480 * CHERRY_PICK_HEAD for the subsequent invocation of commit to use.
481 * However, if the merge did not even start, then we don't want to
482 * write it at all.
484 if (opts->action == REPLAY_PICK && !opts->no_commit && (res == 0 || res == 1))
485 write_cherry_pick_head(commit, "CHERRY_PICK_HEAD");
486 if (opts->action == REPLAY_REVERT && ((opts->no_commit && res == 0) || res == 1))
487 write_cherry_pick_head(commit, "REVERT_HEAD");
489 if (res) {
490 error(opts->action == REPLAY_REVERT
491 ? _("could not revert %s... %s")
492 : _("could not apply %s... %s"),
493 find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV),
494 msg.subject);
495 print_advice(res == 1, opts);
496 rerere(opts->allow_rerere_auto);
497 } else {
498 index_unchanged = is_index_unchanged();
500 * If index_unchanged is less than 0, that indicates we either
501 * couldn't parse HEAD or the index, so error out here.
503 if (index_unchanged < 0)
504 return index_unchanged;
506 if (!empty_commit && !opts->keep_redundant_commits && index_unchanged)
508 * The head tree and the index match
509 * meaning the commit is empty. Since it wasn't created
510 * empty (based on the previous test), we can conclude
511 * the commit has been made redundant. Since we don't
512 * want to keep redundant commits, we can just return
513 * here, skipping this commit
515 return 0;
517 if (!opts->no_commit)
518 res = run_git_commit(defmsg, opts);
521 free_message(&msg);
522 free(defmsg);
524 return res;
527 static void prepare_revs(struct replay_opts *opts)
529 if (opts->action != REPLAY_REVERT)
530 opts->revs->reverse ^= 1;
532 if (prepare_revision_walk(opts->revs))
533 die(_("revision walk setup failed"));
535 if (!opts->revs->commits)
536 die(_("empty commit set passed"));
539 static void read_and_refresh_cache(struct replay_opts *opts)
541 static struct lock_file index_lock;
542 int index_fd = hold_locked_index(&index_lock, 0);
543 if (read_index_preload(&the_index, NULL) < 0)
544 die(_("git %s: failed to read the index"), action_name(opts));
545 refresh_index(&the_index, REFRESH_QUIET|REFRESH_UNMERGED, NULL, NULL, NULL);
546 if (the_index.cache_changed) {
547 if (write_index(&the_index, index_fd) ||
548 commit_locked_index(&index_lock))
549 die(_("git %s: failed to refresh the index"), action_name(opts));
551 rollback_lock_file(&index_lock);
554 static int format_todo(struct strbuf *buf, struct commit_list *todo_list,
555 struct replay_opts *opts)
557 struct commit_list *cur = NULL;
558 const char *sha1_abbrev = NULL;
559 const char *action_str = opts->action == REPLAY_REVERT ? "revert" : "pick";
560 const char *subject;
561 int subject_len;
563 for (cur = todo_list; cur; cur = cur->next) {
564 sha1_abbrev = find_unique_abbrev(cur->item->object.sha1, DEFAULT_ABBREV);
565 subject_len = find_commit_subject(cur->item->buffer, &subject);
566 strbuf_addf(buf, "%s %s %.*s\n", action_str, sha1_abbrev,
567 subject_len, subject);
569 return 0;
572 static struct commit *parse_insn_line(char *bol, char *eol, struct replay_opts *opts)
574 unsigned char commit_sha1[20];
575 enum replay_action action;
576 char *end_of_object_name;
577 int saved, status, padding;
579 if (!prefixcmp(bol, "pick")) {
580 action = REPLAY_PICK;
581 bol += strlen("pick");
582 } else if (!prefixcmp(bol, "revert")) {
583 action = REPLAY_REVERT;
584 bol += strlen("revert");
585 } else
586 return NULL;
588 /* Eat up extra spaces/ tabs before object name */
589 padding = strspn(bol, " \t");
590 if (!padding)
591 return NULL;
592 bol += padding;
594 end_of_object_name = bol + strcspn(bol, " \t\n");
595 saved = *end_of_object_name;
596 *end_of_object_name = '\0';
597 status = get_sha1(bol, commit_sha1);
598 *end_of_object_name = saved;
601 * Verify that the action matches up with the one in
602 * opts; we don't support arbitrary instructions
604 if (action != opts->action) {
605 const char *action_str;
606 action_str = action == REPLAY_REVERT ? "revert" : "cherry-pick";
607 error(_("Cannot %s during a %s"), action_str, action_name(opts));
608 return NULL;
611 if (status < 0)
612 return NULL;
614 return lookup_commit_reference(commit_sha1);
617 static int parse_insn_buffer(char *buf, struct commit_list **todo_list,
618 struct replay_opts *opts)
620 struct commit_list **next = todo_list;
621 struct commit *commit;
622 char *p = buf;
623 int i;
625 for (i = 1; *p; i++) {
626 char *eol = strchrnul(p, '\n');
627 commit = parse_insn_line(p, eol, opts);
628 if (!commit)
629 return error(_("Could not parse line %d."), i);
630 next = commit_list_append(commit, next);
631 p = *eol ? eol + 1 : eol;
633 if (!*todo_list)
634 return error(_("No commits parsed."));
635 return 0;
638 static void read_populate_todo(struct commit_list **todo_list,
639 struct replay_opts *opts)
641 const char *todo_file = git_path(SEQ_TODO_FILE);
642 struct strbuf buf = STRBUF_INIT;
643 int fd, res;
645 fd = open(todo_file, O_RDONLY);
646 if (fd < 0)
647 die_errno(_("Could not open %s"), todo_file);
648 if (strbuf_read(&buf, fd, 0) < 0) {
649 close(fd);
650 strbuf_release(&buf);
651 die(_("Could not read %s."), todo_file);
653 close(fd);
655 res = parse_insn_buffer(buf.buf, todo_list, opts);
656 strbuf_release(&buf);
657 if (res)
658 die(_("Unusable instruction sheet: %s"), todo_file);
661 static int populate_opts_cb(const char *key, const char *value, void *data)
663 struct replay_opts *opts = data;
664 int error_flag = 1;
666 if (!value)
667 error_flag = 0;
668 else if (!strcmp(key, "options.no-commit"))
669 opts->no_commit = git_config_bool_or_int(key, value, &error_flag);
670 else if (!strcmp(key, "options.edit"))
671 opts->edit = git_config_bool_or_int(key, value, &error_flag);
672 else if (!strcmp(key, "options.signoff"))
673 opts->signoff = git_config_bool_or_int(key, value, &error_flag);
674 else if (!strcmp(key, "options.record-origin"))
675 opts->record_origin = git_config_bool_or_int(key, value, &error_flag);
676 else if (!strcmp(key, "options.allow-ff"))
677 opts->allow_ff = git_config_bool_or_int(key, value, &error_flag);
678 else if (!strcmp(key, "options.mainline"))
679 opts->mainline = git_config_int(key, value);
680 else if (!strcmp(key, "options.strategy"))
681 git_config_string(&opts->strategy, key, value);
682 else if (!strcmp(key, "options.strategy-option")) {
683 ALLOC_GROW(opts->xopts, opts->xopts_nr + 1, opts->xopts_alloc);
684 opts->xopts[opts->xopts_nr++] = xstrdup(value);
685 } else
686 return error(_("Invalid key: %s"), key);
688 if (!error_flag)
689 return error(_("Invalid value for %s: %s"), key, value);
691 return 0;
694 static void read_populate_opts(struct replay_opts **opts_ptr)
696 const char *opts_file = git_path(SEQ_OPTS_FILE);
698 if (!file_exists(opts_file))
699 return;
700 if (git_config_from_file(populate_opts_cb, opts_file, *opts_ptr) < 0)
701 die(_("Malformed options sheet: %s"), opts_file);
704 static void walk_revs_populate_todo(struct commit_list **todo_list,
705 struct replay_opts *opts)
707 struct commit *commit;
708 struct commit_list **next;
710 prepare_revs(opts);
712 next = todo_list;
713 while ((commit = get_revision(opts->revs)))
714 next = commit_list_append(commit, next);
717 static int create_seq_dir(void)
719 const char *seq_dir = git_path(SEQ_DIR);
721 if (file_exists(seq_dir)) {
722 error(_("a cherry-pick or revert is already in progress"));
723 advise(_("try \"git cherry-pick (--continue | --quit | --abort)\""));
724 return -1;
726 else if (mkdir(seq_dir, 0777) < 0)
727 die_errno(_("Could not create sequencer directory %s"), seq_dir);
728 return 0;
731 static void save_head(const char *head)
733 const char *head_file = git_path(SEQ_HEAD_FILE);
734 static struct lock_file head_lock;
735 struct strbuf buf = STRBUF_INIT;
736 int fd;
738 fd = hold_lock_file_for_update(&head_lock, head_file, LOCK_DIE_ON_ERROR);
739 strbuf_addf(&buf, "%s\n", head);
740 if (write_in_full(fd, buf.buf, buf.len) < 0)
741 die_errno(_("Could not write to %s"), head_file);
742 if (commit_lock_file(&head_lock) < 0)
743 die(_("Error wrapping up %s."), head_file);
746 static int reset_for_rollback(const unsigned char *sha1)
748 const char *argv[4]; /* reset --merge <arg> + NULL */
749 argv[0] = "reset";
750 argv[1] = "--merge";
751 argv[2] = sha1_to_hex(sha1);
752 argv[3] = NULL;
753 return run_command_v_opt(argv, RUN_GIT_CMD);
756 static int rollback_single_pick(void)
758 unsigned char head_sha1[20];
760 if (!file_exists(git_path("CHERRY_PICK_HEAD")) &&
761 !file_exists(git_path("REVERT_HEAD")))
762 return error(_("no cherry-pick or revert in progress"));
763 if (read_ref_full("HEAD", head_sha1, 0, NULL))
764 return error(_("cannot resolve HEAD"));
765 if (is_null_sha1(head_sha1))
766 return error(_("cannot abort from a branch yet to be born"));
767 return reset_for_rollback(head_sha1);
770 static int sequencer_rollback(struct replay_opts *opts)
772 const char *filename;
773 FILE *f;
774 unsigned char sha1[20];
775 struct strbuf buf = STRBUF_INIT;
777 filename = git_path(SEQ_HEAD_FILE);
778 f = fopen(filename, "r");
779 if (!f && errno == ENOENT) {
781 * There is no multiple-cherry-pick in progress.
782 * If CHERRY_PICK_HEAD or REVERT_HEAD indicates
783 * a single-cherry-pick in progress, abort that.
785 return rollback_single_pick();
787 if (!f)
788 return error(_("cannot open %s: %s"), filename,
789 strerror(errno));
790 if (strbuf_getline(&buf, f, '\n')) {
791 error(_("cannot read %s: %s"), filename, ferror(f) ?
792 strerror(errno) : _("unexpected end of file"));
793 fclose(f);
794 goto fail;
796 fclose(f);
797 if (get_sha1_hex(buf.buf, sha1) || buf.buf[40] != '\0') {
798 error(_("stored pre-cherry-pick HEAD file '%s' is corrupt"),
799 filename);
800 goto fail;
802 if (reset_for_rollback(sha1))
803 goto fail;
804 remove_sequencer_state();
805 strbuf_release(&buf);
806 return 0;
807 fail:
808 strbuf_release(&buf);
809 return -1;
812 static void save_todo(struct commit_list *todo_list, struct replay_opts *opts)
814 const char *todo_file = git_path(SEQ_TODO_FILE);
815 static struct lock_file todo_lock;
816 struct strbuf buf = STRBUF_INIT;
817 int fd;
819 fd = hold_lock_file_for_update(&todo_lock, todo_file, LOCK_DIE_ON_ERROR);
820 if (format_todo(&buf, todo_list, opts) < 0)
821 die(_("Could not format %s."), todo_file);
822 if (write_in_full(fd, buf.buf, buf.len) < 0) {
823 strbuf_release(&buf);
824 die_errno(_("Could not write to %s"), todo_file);
826 if (commit_lock_file(&todo_lock) < 0) {
827 strbuf_release(&buf);
828 die(_("Error wrapping up %s."), todo_file);
830 strbuf_release(&buf);
833 static void save_opts(struct replay_opts *opts)
835 const char *opts_file = git_path(SEQ_OPTS_FILE);
837 if (opts->no_commit)
838 git_config_set_in_file(opts_file, "options.no-commit", "true");
839 if (opts->edit)
840 git_config_set_in_file(opts_file, "options.edit", "true");
841 if (opts->signoff)
842 git_config_set_in_file(opts_file, "options.signoff", "true");
843 if (opts->record_origin)
844 git_config_set_in_file(opts_file, "options.record-origin", "true");
845 if (opts->allow_ff)
846 git_config_set_in_file(opts_file, "options.allow-ff", "true");
847 if (opts->mainline) {
848 struct strbuf buf = STRBUF_INIT;
849 strbuf_addf(&buf, "%d", opts->mainline);
850 git_config_set_in_file(opts_file, "options.mainline", buf.buf);
851 strbuf_release(&buf);
853 if (opts->strategy)
854 git_config_set_in_file(opts_file, "options.strategy", opts->strategy);
855 if (opts->xopts) {
856 int i;
857 for (i = 0; i < opts->xopts_nr; i++)
858 git_config_set_multivar_in_file(opts_file,
859 "options.strategy-option",
860 opts->xopts[i], "^$", 0);
864 static int pick_commits(struct commit_list *todo_list, struct replay_opts *opts)
866 struct commit_list *cur;
867 int res;
869 setenv(GIT_REFLOG_ACTION, action_name(opts), 0);
870 if (opts->allow_ff)
871 assert(!(opts->signoff || opts->no_commit ||
872 opts->record_origin || opts->edit));
873 read_and_refresh_cache(opts);
875 for (cur = todo_list; cur; cur = cur->next) {
876 save_todo(cur, opts);
877 res = do_pick_commit(cur->item, opts);
878 if (res)
879 return res;
883 * Sequence of picks finished successfully; cleanup by
884 * removing the .git/sequencer directory
886 remove_sequencer_state();
887 return 0;
890 static int continue_single_pick(void)
892 const char *argv[] = { "commit", NULL };
894 if (!file_exists(git_path("CHERRY_PICK_HEAD")) &&
895 !file_exists(git_path("REVERT_HEAD")))
896 return error(_("no cherry-pick or revert in progress"));
897 return run_command_v_opt(argv, RUN_GIT_CMD);
900 static int sequencer_continue(struct replay_opts *opts)
902 struct commit_list *todo_list = NULL;
904 if (!file_exists(git_path(SEQ_TODO_FILE)))
905 return continue_single_pick();
906 read_populate_opts(&opts);
907 read_populate_todo(&todo_list, opts);
909 /* Verify that the conflict has been resolved */
910 if (file_exists(git_path("CHERRY_PICK_HEAD")) ||
911 file_exists(git_path("REVERT_HEAD"))) {
912 int ret = continue_single_pick();
913 if (ret)
914 return ret;
916 if (index_differs_from("HEAD", 0))
917 return error_dirty_index(opts);
918 todo_list = todo_list->next;
919 return pick_commits(todo_list, opts);
922 static int single_pick(struct commit *cmit, struct replay_opts *opts)
924 setenv(GIT_REFLOG_ACTION, action_name(opts), 0);
925 return do_pick_commit(cmit, opts);
928 int sequencer_pick_revisions(struct replay_opts *opts)
930 struct commit_list *todo_list = NULL;
931 unsigned char sha1[20];
933 if (opts->subcommand == REPLAY_NONE)
934 assert(opts->revs);
936 read_and_refresh_cache(opts);
939 * Decide what to do depending on the arguments; a fresh
940 * cherry-pick should be handled differently from an existing
941 * one that is being continued
943 if (opts->subcommand == REPLAY_REMOVE_STATE) {
944 remove_sequencer_state();
945 return 0;
947 if (opts->subcommand == REPLAY_ROLLBACK)
948 return sequencer_rollback(opts);
949 if (opts->subcommand == REPLAY_CONTINUE)
950 return sequencer_continue(opts);
953 * If we were called as "git cherry-pick <commit>", just
954 * cherry-pick/revert it, set CHERRY_PICK_HEAD /
955 * REVERT_HEAD, and don't touch the sequencer state.
956 * This means it is possible to cherry-pick in the middle
957 * of a cherry-pick sequence.
959 if (opts->revs->cmdline.nr == 1 &&
960 opts->revs->cmdline.rev->whence == REV_CMD_REV &&
961 opts->revs->no_walk &&
962 !opts->revs->cmdline.rev->flags) {
963 struct commit *cmit;
964 if (prepare_revision_walk(opts->revs))
965 die(_("revision walk setup failed"));
966 cmit = get_revision(opts->revs);
967 if (!cmit || get_revision(opts->revs))
968 die("BUG: expected exactly one commit from walk");
969 return single_pick(cmit, opts);
973 * Start a new cherry-pick/ revert sequence; but
974 * first, make sure that an existing one isn't in
975 * progress
978 walk_revs_populate_todo(&todo_list, opts);
979 if (create_seq_dir() < 0)
980 return -1;
981 if (get_sha1("HEAD", sha1)) {
982 if (opts->action == REPLAY_REVERT)
983 return error(_("Can't revert as initial commit"));
984 return error(_("Can't cherry-pick into empty head"));
986 save_head(sha1_to_hex(sha1));
987 save_opts(opts);
988 return pick_commits(todo_list, opts);