1#include "cache.h"
2#include "config.h"
3#include "lockfile.h"
4#include "sequencer.h"
5#include "dir.h"
6#include "object.h"
7#include "commit.h"
8#include "tag.h"
9#include "run-command.h"
10#include "exec_cmd.h"
11#include "utf8.h"
12#include "cache-tree.h"
13#include "diff.h"
14#include "revision.h"
15#include "rerere.h"
16#include "merge-recursive.h"
17#include "refs.h"
18#include "argv-array.h"
19#include "quote.h"
20#include "trailer.h"
21#include "log-tree.h"
22#include "wt-status.h"
23#include "hashmap.h"
24
25#define GIT_REFLOG_ACTION "GIT_REFLOG_ACTION"
26
27const char sign_off_header[] = "Signed-off-by: ";
28static const char cherry_picked_prefix[] = "(cherry picked from commit ";
29
30GIT_PATH_FUNC(git_path_seq_dir, "sequencer")
31
32static GIT_PATH_FUNC(git_path_todo_file, "sequencer/todo")
33static GIT_PATH_FUNC(git_path_opts_file, "sequencer/opts")
34static GIT_PATH_FUNC(git_path_head_file, "sequencer/head")
35static GIT_PATH_FUNC(git_path_abort_safety_file, "sequencer/abort-safety")
36
37static GIT_PATH_FUNC(rebase_path, "rebase-merge")
38/*
39 * The file containing rebase commands, comments, and empty lines.
40 * This file is created by "git rebase -i" then edited by the user. As
41 * the lines are processed, they are removed from the front of this
42 * file and written to the tail of 'done'.
43 */
44static GIT_PATH_FUNC(rebase_path_todo, "rebase-merge/git-rebase-todo")
45/*
46 * The rebase command lines that have already been processed. A line
47 * is moved here when it is first handled, before any associated user
48 * actions.
49 */
50static GIT_PATH_FUNC(rebase_path_done, "rebase-merge/done")
51/*
52 * The file to keep track of how many commands were already processed (e.g.
53 * for the prompt).
54 */
55static GIT_PATH_FUNC(rebase_path_msgnum, "rebase-merge/msgnum");
56/*
57 * The file to keep track of how many commands are to be processed in total
58 * (e.g. for the prompt).
59 */
60static GIT_PATH_FUNC(rebase_path_msgtotal, "rebase-merge/end");
61/*
62 * The commit message that is planned to be used for any changes that
63 * need to be committed following a user interaction.
64 */
65static GIT_PATH_FUNC(rebase_path_message, "rebase-merge/message")
66/*
67 * The file into which is accumulated the suggested commit message for
68 * squash/fixup commands. When the first of a series of squash/fixups
69 * is seen, the file is created and the commit message from the
70 * previous commit and from the first squash/fixup commit are written
71 * to it. The commit message for each subsequent squash/fixup commit
72 * is appended to the file as it is processed.
73 *
74 * The first line of the file is of the form
75 * # This is a combination of $count commits.
76 * where $count is the number of commits whose messages have been
77 * written to the file so far (including the initial "pick" commit).
78 * Each time that a commit message is processed, this line is read and
79 * updated. It is deleted just before the combined commit is made.
80 */
81static GIT_PATH_FUNC(rebase_path_squash_msg, "rebase-merge/message-squash")
82/*
83 * If the current series of squash/fixups has not yet included a squash
84 * command, then this file exists and holds the commit message of the
85 * original "pick" commit. (If the series ends without a "squash"
86 * command, then this can be used as the commit message of the combined
87 * commit without opening the editor.)
88 */
89static GIT_PATH_FUNC(rebase_path_fixup_msg, "rebase-merge/message-fixup")
90/*
91 * A script to set the GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
92 * GIT_AUTHOR_DATE that will be used for the commit that is currently
93 * being rebased.
94 */
95static GIT_PATH_FUNC(rebase_path_author_script, "rebase-merge/author-script")
96/*
97 * When an "edit" rebase command is being processed, the SHA1 of the
98 * commit to be edited is recorded in this file. When "git rebase
99 * --continue" is executed, if there are any staged changes then they
100 * will be amended to the HEAD commit, but only provided the HEAD
101 * commit is still the commit to be edited. When any other rebase
102 * command is processed, this file is deleted.
103 */
104static GIT_PATH_FUNC(rebase_path_amend, "rebase-merge/amend")
105/*
106 * When we stop at a given patch via the "edit" command, this file contains
107 * the abbreviated commit name of the corresponding patch.
108 */
109static GIT_PATH_FUNC(rebase_path_stopped_sha, "rebase-merge/stopped-sha")
110/*
111 * For the post-rewrite hook, we make a list of rewritten commits and
112 * their new sha1s. The rewritten-pending list keeps the sha1s of
113 * commits that have been processed, but not committed yet,
114 * e.g. because they are waiting for a 'squash' command.
115 */
116static GIT_PATH_FUNC(rebase_path_rewritten_list, "rebase-merge/rewritten-list")
117static GIT_PATH_FUNC(rebase_path_rewritten_pending,
118 "rebase-merge/rewritten-pending")
119/*
120 * The following files are written by git-rebase just after parsing the
121 * command-line (and are only consumed, not modified, by the sequencer).
122 */
123static GIT_PATH_FUNC(rebase_path_gpg_sign_opt, "rebase-merge/gpg_sign_opt")
124static GIT_PATH_FUNC(rebase_path_orig_head, "rebase-merge/orig-head")
125static GIT_PATH_FUNC(rebase_path_verbose, "rebase-merge/verbose")
126static GIT_PATH_FUNC(rebase_path_head_name, "rebase-merge/head-name")
127static GIT_PATH_FUNC(rebase_path_onto, "rebase-merge/onto")
128static GIT_PATH_FUNC(rebase_path_autostash, "rebase-merge/autostash")
129static GIT_PATH_FUNC(rebase_path_strategy, "rebase-merge/strategy")
130static GIT_PATH_FUNC(rebase_path_strategy_opts, "rebase-merge/strategy_opts")
131static GIT_PATH_FUNC(rebase_path_allow_rerere_autoupdate, "rebase-merge/allow_rerere_autoupdate")
132
133static inline int is_rebase_i(const struct replay_opts *opts)
134{
135 return opts->action == REPLAY_INTERACTIVE_REBASE;
136}
137
138static const char *get_dir(const struct replay_opts *opts)
139{
140 if (is_rebase_i(opts))
141 return rebase_path();
142 return git_path_seq_dir();
143}
144
145static const char *get_todo_path(const struct replay_opts *opts)
146{
147 if (is_rebase_i(opts))
148 return rebase_path_todo();
149 return git_path_todo_file();
150}
151
152/*
153 * Returns 0 for non-conforming footer
154 * Returns 1 for conforming footer
155 * Returns 2 when sob exists within conforming footer
156 * Returns 3 when sob exists within conforming footer as last entry
157 */
158static int has_conforming_footer(struct strbuf *sb, struct strbuf *sob,
159 int ignore_footer)
160{
161 struct trailer_info info;
162 int i;
163 int found_sob = 0, found_sob_last = 0;
164
165 trailer_info_get(&info, sb->buf);
166
167 if (info.trailer_start == info.trailer_end)
168 return 0;
169
170 for (i = 0; i < info.trailer_nr; i++)
171 if (sob && !strncmp(info.trailers[i], sob->buf, sob->len)) {
172 found_sob = 1;
173 if (i == info.trailer_nr - 1)
174 found_sob_last = 1;
175 }
176
177 trailer_info_release(&info);
178
179 if (found_sob_last)
180 return 3;
181 if (found_sob)
182 return 2;
183 return 1;
184}
185
186static const char *gpg_sign_opt_quoted(struct replay_opts *opts)
187{
188 static struct strbuf buf = STRBUF_INIT;
189
190 strbuf_reset(&buf);
191 if (opts->gpg_sign)
192 sq_quotef(&buf, "-S%s", opts->gpg_sign);
193 return buf.buf;
194}
195
196int sequencer_remove_state(struct replay_opts *opts)
197{
198 struct strbuf dir = STRBUF_INIT;
199 int i;
200
201 free(opts->gpg_sign);
202 free(opts->strategy);
203 for (i = 0; i < opts->xopts_nr; i++)
204 free(opts->xopts[i]);
205 free(opts->xopts);
206
207 strbuf_addstr(&dir, get_dir(opts));
208 remove_dir_recursively(&dir, 0);
209 strbuf_release(&dir);
210
211 return 0;
212}
213
214static const char *action_name(const struct replay_opts *opts)
215{
216 switch (opts->action) {
217 case REPLAY_REVERT:
218 return N_("revert");
219 case REPLAY_PICK:
220 return N_("cherry-pick");
221 case REPLAY_INTERACTIVE_REBASE:
222 return N_("rebase -i");
223 }
224 die(_("Unknown action: %d"), opts->action);
225}
226
227struct commit_message {
228 char *parent_label;
229 char *label;
230 char *subject;
231 const char *message;
232};
233
234static const char *short_commit_name(struct commit *commit)
235{
236 return find_unique_abbrev(commit->object.oid.hash, DEFAULT_ABBREV);
237}
238
239static int get_message(struct commit *commit, struct commit_message *out)
240{
241 const char *abbrev, *subject;
242 int subject_len;
243
244 out->message = logmsg_reencode(commit, NULL, get_commit_output_encoding());
245 abbrev = short_commit_name(commit);
246
247 subject_len = find_commit_subject(out->message, &subject);
248
249 out->subject = xmemdupz(subject, subject_len);
250 out->label = xstrfmt("%s... %s", abbrev, out->subject);
251 out->parent_label = xstrfmt("parent of %s", out->label);
252
253 return 0;
254}
255
256static void free_message(struct commit *commit, struct commit_message *msg)
257{
258 free(msg->parent_label);
259 free(msg->label);
260 free(msg->subject);
261 unuse_commit_buffer(commit, msg->message);
262}
263
264static void print_advice(int show_hint, struct replay_opts *opts)
265{
266 char *msg = getenv("GIT_CHERRY_PICK_HELP");
267
268 if (msg) {
269 fprintf(stderr, "%s\n", msg);
270 /*
271 * A conflict has occurred but the porcelain
272 * (typically rebase --interactive) wants to take care
273 * of the commit itself so remove CHERRY_PICK_HEAD
274 */
275 unlink(git_path_cherry_pick_head());
276 return;
277 }
278
279 if (show_hint) {
280 if (opts->no_commit)
281 advise(_("after resolving the conflicts, mark the corrected paths\n"
282 "with 'git add <paths>' or 'git rm <paths>'"));
283 else
284 advise(_("after resolving the conflicts, mark the corrected paths\n"
285 "with 'git add <paths>' or 'git rm <paths>'\n"
286 "and commit the result with 'git commit'"));
287 }
288}
289
290static int write_message(const void *buf, size_t len, const char *filename,
291 int append_eol)
292{
293 static struct lock_file msg_file;
294
295 int msg_fd = hold_lock_file_for_update(&msg_file, filename, 0);
296 if (msg_fd < 0)
297 return error_errno(_("could not lock '%s'"), filename);
298 if (write_in_full(msg_fd, buf, len) < 0) {
299 rollback_lock_file(&msg_file);
300 return error_errno(_("could not write to '%s'"), filename);
301 }
302 if (append_eol && write(msg_fd, "\n", 1) < 0) {
303 rollback_lock_file(&msg_file);
304 return error_errno(_("could not write eol to '%s'"), filename);
305 }
306 if (commit_lock_file(&msg_file) < 0) {
307 rollback_lock_file(&msg_file);
308 return error(_("failed to finalize '%s'."), filename);
309 }
310
311 return 0;
312}
313
314/*
315 * Reads a file that was presumably written by a shell script, i.e. with an
316 * end-of-line marker that needs to be stripped.
317 *
318 * Note that only the last end-of-line marker is stripped, consistent with the
319 * behavior of "$(cat path)" in a shell script.
320 *
321 * Returns 1 if the file was read, 0 if it could not be read or does not exist.
322 */
323static int read_oneliner(struct strbuf *buf,
324 const char *path, int skip_if_empty)
325{
326 int orig_len = buf->len;
327
328 if (!file_exists(path))
329 return 0;
330
331 if (strbuf_read_file(buf, path, 0) < 0) {
332 warning_errno(_("could not read '%s'"), path);
333 return 0;
334 }
335
336 if (buf->len > orig_len && buf->buf[buf->len - 1] == '\n') {
337 if (--buf->len > orig_len && buf->buf[buf->len - 1] == '\r')
338 --buf->len;
339 buf->buf[buf->len] = '\0';
340 }
341
342 if (skip_if_empty && buf->len == orig_len)
343 return 0;
344
345 return 1;
346}
347
348static struct tree *empty_tree(void)
349{
350 return lookup_tree(the_hash_algo->empty_tree);
351}
352
353static int error_dirty_index(struct replay_opts *opts)
354{
355 if (read_cache_unmerged())
356 return error_resolve_conflict(_(action_name(opts)));
357
358 error(_("your local changes would be overwritten by %s."),
359 _(action_name(opts)));
360
361 if (advice_commit_before_merge)
362 advise(_("commit your changes or stash them to proceed."));
363 return -1;
364}
365
366static void update_abort_safety_file(void)
367{
368 struct object_id head;
369
370 /* Do nothing on a single-pick */
371 if (!file_exists(git_path_seq_dir()))
372 return;
373
374 if (!get_oid("HEAD", &head))
375 write_file(git_path_abort_safety_file(), "%s", oid_to_hex(&head));
376 else
377 write_file(git_path_abort_safety_file(), "%s", "");
378}
379
380static int fast_forward_to(const struct object_id *to, const struct object_id *from,
381 int unborn, struct replay_opts *opts)
382{
383 struct ref_transaction *transaction;
384 struct strbuf sb = STRBUF_INIT;
385 struct strbuf err = STRBUF_INIT;
386
387 read_cache();
388 if (checkout_fast_forward(from, to, 1))
389 return -1; /* the callee should have complained already */
390
391 strbuf_addf(&sb, _("%s: fast-forward"), _(action_name(opts)));
392
393 transaction = ref_transaction_begin(&err);
394 if (!transaction ||
395 ref_transaction_update(transaction, "HEAD",
396 to, unborn ? &null_oid : from,
397 0, sb.buf, &err) ||
398 ref_transaction_commit(transaction, &err)) {
399 ref_transaction_free(transaction);
400 error("%s", err.buf);
401 strbuf_release(&sb);
402 strbuf_release(&err);
403 return -1;
404 }
405
406 strbuf_release(&sb);
407 strbuf_release(&err);
408 ref_transaction_free(transaction);
409 update_abort_safety_file();
410 return 0;
411}
412
413void append_conflicts_hint(struct strbuf *msgbuf)
414{
415 int i;
416
417 strbuf_addch(msgbuf, '\n');
418 strbuf_commented_addf(msgbuf, "Conflicts:\n");
419 for (i = 0; i < active_nr;) {
420 const struct cache_entry *ce = active_cache[i++];
421 if (ce_stage(ce)) {
422 strbuf_commented_addf(msgbuf, "\t%s\n", ce->name);
423 while (i < active_nr && !strcmp(ce->name,
424 active_cache[i]->name))
425 i++;
426 }
427 }
428}
429
430static int do_recursive_merge(struct commit *base, struct commit *next,
431 const char *base_label, const char *next_label,
432 struct object_id *head, struct strbuf *msgbuf,
433 struct replay_opts *opts)
434{
435 struct merge_options o;
436 struct tree *result, *next_tree, *base_tree, *head_tree;
437 int clean;
438 char **xopt;
439 static struct lock_file index_lock;
440
441 if (hold_locked_index(&index_lock, LOCK_REPORT_ON_ERROR) < 0)
442 return -1;
443
444 read_cache();
445
446 init_merge_options(&o);
447 o.ancestor = base ? base_label : "(empty tree)";
448 o.branch1 = "HEAD";
449 o.branch2 = next ? next_label : "(empty tree)";
450 if (is_rebase_i(opts))
451 o.buffer_output = 2;
452 o.show_rename_progress = 1;
453
454 head_tree = parse_tree_indirect(head);
455 next_tree = next ? next->tree : empty_tree();
456 base_tree = base ? base->tree : empty_tree();
457
458 for (xopt = opts->xopts; xopt != opts->xopts + opts->xopts_nr; xopt++)
459 parse_merge_opt(&o, *xopt);
460
461 clean = merge_trees(&o,
462 head_tree,
463 next_tree, base_tree, &result);
464 if (is_rebase_i(opts) && clean <= 0)
465 fputs(o.obuf.buf, stdout);
466 strbuf_release(&o.obuf);
467 diff_warn_rename_limit("merge.renamelimit", o.needed_rename_limit, 0);
468 if (clean < 0)
469 return clean;
470
471 if (active_cache_changed &&
472 write_locked_index(&the_index, &index_lock, COMMIT_LOCK))
473 /*
474 * TRANSLATORS: %s will be "revert", "cherry-pick" or
475 * "rebase -i".
476 */
477 return error(_("%s: Unable to write new index file"),
478 _(action_name(opts)));
479 rollback_lock_file(&index_lock);
480
481 if (opts->signoff)
482 append_signoff(msgbuf, 0, 0);
483
484 if (!clean)
485 append_conflicts_hint(msgbuf);
486
487 return !clean;
488}
489
490static int is_index_unchanged(void)
491{
492 struct object_id head_oid;
493 struct commit *head_commit;
494
495 if (!resolve_ref_unsafe("HEAD", RESOLVE_REF_READING, &head_oid, NULL))
496 return error(_("could not resolve HEAD commit"));
497
498 head_commit = lookup_commit(&head_oid);
499
500 /*
501 * If head_commit is NULL, check_commit, called from
502 * lookup_commit, would have indicated that head_commit is not
503 * a commit object already. parse_commit() will return failure
504 * without further complaints in such a case. Otherwise, if
505 * the commit is invalid, parse_commit() will complain. So
506 * there is nothing for us to say here. Just return failure.
507 */
508 if (parse_commit(head_commit))
509 return -1;
510
511 if (!active_cache_tree)
512 active_cache_tree = cache_tree();
513
514 if (!cache_tree_fully_valid(active_cache_tree))
515 if (cache_tree_update(&the_index, 0))
516 return error(_("unable to update cache tree"));
517
518 return !oidcmp(&active_cache_tree->oid,
519 &head_commit->tree->object.oid);
520}
521
522static int write_author_script(const char *message)
523{
524 struct strbuf buf = STRBUF_INIT;
525 const char *eol;
526 int res;
527
528 for (;;)
529 if (!*message || starts_with(message, "\n")) {
530missing_author:
531 /* Missing 'author' line? */
532 unlink(rebase_path_author_script());
533 return 0;
534 } else if (skip_prefix(message, "author ", &message))
535 break;
536 else if ((eol = strchr(message, '\n')))
537 message = eol + 1;
538 else
539 goto missing_author;
540
541 strbuf_addstr(&buf, "GIT_AUTHOR_NAME='");
542 while (*message && *message != '\n' && *message != '\r')
543 if (skip_prefix(message, " <", &message))
544 break;
545 else if (*message != '\'')
546 strbuf_addch(&buf, *(message++));
547 else
548 strbuf_addf(&buf, "'\\\\%c'", *(message++));
549 strbuf_addstr(&buf, "'\nGIT_AUTHOR_EMAIL='");
550 while (*message && *message != '\n' && *message != '\r')
551 if (skip_prefix(message, "> ", &message))
552 break;
553 else if (*message != '\'')
554 strbuf_addch(&buf, *(message++));
555 else
556 strbuf_addf(&buf, "'\\\\%c'", *(message++));
557 strbuf_addstr(&buf, "'\nGIT_AUTHOR_DATE='@");
558 while (*message && *message != '\n' && *message != '\r')
559 if (*message != '\'')
560 strbuf_addch(&buf, *(message++));
561 else
562 strbuf_addf(&buf, "'\\\\%c'", *(message++));
563 res = write_message(buf.buf, buf.len, rebase_path_author_script(), 1);
564 strbuf_release(&buf);
565 return res;
566}
567
568/*
569 * Read a list of environment variable assignments (such as the author-script
570 * file) into an environment block. Returns -1 on error, 0 otherwise.
571 */
572static int read_env_script(struct argv_array *env)
573{
574 struct strbuf script = STRBUF_INIT;
575 int i, count = 0;
576 char *p, *p2;
577
578 if (strbuf_read_file(&script, rebase_path_author_script(), 256) <= 0)
579 return -1;
580
581 for (p = script.buf; *p; p++)
582 if (skip_prefix(p, "'\\\\''", (const char **)&p2))
583 strbuf_splice(&script, p - script.buf, p2 - p, "'", 1);
584 else if (*p == '\'')
585 strbuf_splice(&script, p-- - script.buf, 1, "", 0);
586 else if (*p == '\n') {
587 *p = '\0';
588 count++;
589 }
590
591 for (i = 0, p = script.buf; i < count; i++) {
592 argv_array_push(env, p);
593 p += strlen(p) + 1;
594 }
595
596 return 0;
597}
598
599static const char staged_changes_advice[] =
600N_("you have staged changes in your working tree\n"
601"If these changes are meant to be squashed into the previous commit, run:\n"
602"\n"
603" git commit --amend %s\n"
604"\n"
605"If they are meant to go into a new commit, run:\n"
606"\n"
607" git commit %s\n"
608"\n"
609"In both cases, once you're done, continue with:\n"
610"\n"
611" git rebase --continue\n");
612
613#define ALLOW_EMPTY (1<<0)
614#define EDIT_MSG (1<<1)
615#define AMEND_MSG (1<<2)
616#define CLEANUP_MSG (1<<3)
617#define VERIFY_MSG (1<<4)
618
619/*
620 * If we are cherry-pick, and if the merge did not result in
621 * hand-editing, we will hit this commit and inherit the original
622 * author date and name.
623 *
624 * If we are revert, or if our cherry-pick results in a hand merge,
625 * we had better say that the current user is responsible for that.
626 *
627 * An exception is when run_git_commit() is called during an
628 * interactive rebase: in that case, we will want to retain the
629 * author metadata.
630 */
631static int run_git_commit(const char *defmsg, struct replay_opts *opts,
632 unsigned int flags)
633{
634 struct child_process cmd = CHILD_PROCESS_INIT;
635 const char *value;
636
637 cmd.git_cmd = 1;
638
639 if (is_rebase_i(opts)) {
640 if (!(flags & EDIT_MSG)) {
641 cmd.stdout_to_stderr = 1;
642 cmd.err = -1;
643 }
644
645 if (read_env_script(&cmd.env_array)) {
646 const char *gpg_opt = gpg_sign_opt_quoted(opts);
647
648 return error(_(staged_changes_advice),
649 gpg_opt, gpg_opt);
650 }
651 }
652
653 argv_array_push(&cmd.args, "commit");
654
655 if (!(flags & VERIFY_MSG))
656 argv_array_push(&cmd.args, "-n");
657 if ((flags & AMEND_MSG))
658 argv_array_push(&cmd.args, "--amend");
659 if (opts->gpg_sign)
660 argv_array_pushf(&cmd.args, "-S%s", opts->gpg_sign);
661 if (opts->signoff)
662 argv_array_push(&cmd.args, "-s");
663 if (defmsg)
664 argv_array_pushl(&cmd.args, "-F", defmsg, NULL);
665 if ((flags & CLEANUP_MSG))
666 argv_array_push(&cmd.args, "--cleanup=strip");
667 if ((flags & EDIT_MSG))
668 argv_array_push(&cmd.args, "-e");
669 else if (!(flags & CLEANUP_MSG) &&
670 !opts->signoff && !opts->record_origin &&
671 git_config_get_value("commit.cleanup", &value))
672 argv_array_push(&cmd.args, "--cleanup=verbatim");
673
674 if ((flags & ALLOW_EMPTY))
675 argv_array_push(&cmd.args, "--allow-empty");
676
677 if (opts->allow_empty_message)
678 argv_array_push(&cmd.args, "--allow-empty-message");
679
680 if (cmd.err == -1) {
681 /* hide stderr on success */
682 struct strbuf buf = STRBUF_INIT;
683 int rc = pipe_command(&cmd,
684 NULL, 0,
685 /* stdout is already redirected */
686 NULL, 0,
687 &buf, 0);
688 if (rc)
689 fputs(buf.buf, stderr);
690 strbuf_release(&buf);
691 return rc;
692 }
693
694 return run_command(&cmd);
695}
696
697static int is_original_commit_empty(struct commit *commit)
698{
699 const struct object_id *ptree_oid;
700
701 if (parse_commit(commit))
702 return error(_("could not parse commit %s"),
703 oid_to_hex(&commit->object.oid));
704 if (commit->parents) {
705 struct commit *parent = commit->parents->item;
706 if (parse_commit(parent))
707 return error(_("could not parse parent commit %s"),
708 oid_to_hex(&parent->object.oid));
709 ptree_oid = &parent->tree->object.oid;
710 } else {
711 ptree_oid = the_hash_algo->empty_tree; /* commit is root */
712 }
713
714 return !oidcmp(ptree_oid, &commit->tree->object.oid);
715}
716
717/*
718 * Do we run "git commit" with "--allow-empty"?
719 */
720static int allow_empty(struct replay_opts *opts, struct commit *commit)
721{
722 int index_unchanged, empty_commit;
723
724 /*
725 * Three cases:
726 *
727 * (1) we do not allow empty at all and error out.
728 *
729 * (2) we allow ones that were initially empty, but
730 * forbid the ones that become empty;
731 *
732 * (3) we allow both.
733 */
734 if (!opts->allow_empty)
735 return 0; /* let "git commit" barf as necessary */
736
737 index_unchanged = is_index_unchanged();
738 if (index_unchanged < 0)
739 return index_unchanged;
740 if (!index_unchanged)
741 return 0; /* we do not have to say --allow-empty */
742
743 if (opts->keep_redundant_commits)
744 return 1;
745
746 empty_commit = is_original_commit_empty(commit);
747 if (empty_commit < 0)
748 return empty_commit;
749 if (!empty_commit)
750 return 0;
751 else
752 return 1;
753}
754
755/*
756 * Note that ordering matters in this enum. Not only must it match the mapping
757 * below, it is also divided into several sections that matter. When adding
758 * new commands, make sure you add it in the right section.
759 */
760enum todo_command {
761 /* commands that handle commits */
762 TODO_PICK = 0,
763 TODO_REVERT,
764 TODO_EDIT,
765 TODO_REWORD,
766 TODO_FIXUP,
767 TODO_SQUASH,
768 /* commands that do something else than handling a single commit */
769 TODO_EXEC,
770 /* commands that do nothing but are counted for reporting progress */
771 TODO_NOOP,
772 TODO_DROP,
773 /* comments (not counted for reporting progress) */
774 TODO_COMMENT
775};
776
777static struct {
778 char c;
779 const char *str;
780} todo_command_info[] = {
781 { 'p', "pick" },
782 { 0, "revert" },
783 { 'e', "edit" },
784 { 'r', "reword" },
785 { 'f', "fixup" },
786 { 's', "squash" },
787 { 'x', "exec" },
788 { 0, "noop" },
789 { 'd', "drop" },
790 { 0, NULL }
791};
792
793static const char *command_to_string(const enum todo_command command)
794{
795 if (command < TODO_COMMENT)
796 return todo_command_info[command].str;
797 die("Unknown command: %d", command);
798}
799
800static char command_to_char(const enum todo_command command)
801{
802 if (command < TODO_COMMENT && todo_command_info[command].c)
803 return todo_command_info[command].c;
804 return comment_line_char;
805}
806
807static int is_noop(const enum todo_command command)
808{
809 return TODO_NOOP <= command;
810}
811
812static int is_fixup(enum todo_command command)
813{
814 return command == TODO_FIXUP || command == TODO_SQUASH;
815}
816
817static int update_squash_messages(enum todo_command command,
818 struct commit *commit, struct replay_opts *opts)
819{
820 struct strbuf buf = STRBUF_INIT;
821 int count, res;
822 const char *message, *body;
823
824 if (file_exists(rebase_path_squash_msg())) {
825 struct strbuf header = STRBUF_INIT;
826 char *eol, *p;
827
828 if (strbuf_read_file(&buf, rebase_path_squash_msg(), 2048) <= 0)
829 return error(_("could not read '%s'"),
830 rebase_path_squash_msg());
831
832 p = buf.buf + 1;
833 eol = strchrnul(buf.buf, '\n');
834 if (buf.buf[0] != comment_line_char ||
835 (p += strcspn(p, "0123456789\n")) == eol)
836 return error(_("unexpected 1st line of squash message:"
837 "\n\n\t%.*s"),
838 (int)(eol - buf.buf), buf.buf);
839 count = strtol(p, NULL, 10);
840
841 if (count < 1)
842 return error(_("invalid 1st line of squash message:\n"
843 "\n\t%.*s"),
844 (int)(eol - buf.buf), buf.buf);
845
846 strbuf_addf(&header, "%c ", comment_line_char);
847 strbuf_addf(&header,
848 _("This is a combination of %d commits."), ++count);
849 strbuf_splice(&buf, 0, eol - buf.buf, header.buf, header.len);
850 strbuf_release(&header);
851 } else {
852 struct object_id head;
853 struct commit *head_commit;
854 const char *head_message, *body;
855
856 if (get_oid("HEAD", &head))
857 return error(_("need a HEAD to fixup"));
858 if (!(head_commit = lookup_commit_reference(&head)))
859 return error(_("could not read HEAD"));
860 if (!(head_message = get_commit_buffer(head_commit, NULL)))
861 return error(_("could not read HEAD's commit message"));
862
863 find_commit_subject(head_message, &body);
864 if (write_message(body, strlen(body),
865 rebase_path_fixup_msg(), 0)) {
866 unuse_commit_buffer(head_commit, head_message);
867 return error(_("cannot write '%s'"),
868 rebase_path_fixup_msg());
869 }
870
871 count = 2;
872 strbuf_addf(&buf, "%c ", comment_line_char);
873 strbuf_addf(&buf, _("This is a combination of %d commits."),
874 count);
875 strbuf_addf(&buf, "\n%c ", comment_line_char);
876 strbuf_addstr(&buf, _("This is the 1st commit message:"));
877 strbuf_addstr(&buf, "\n\n");
878 strbuf_addstr(&buf, body);
879
880 unuse_commit_buffer(head_commit, head_message);
881 }
882
883 if (!(message = get_commit_buffer(commit, NULL)))
884 return error(_("could not read commit message of %s"),
885 oid_to_hex(&commit->object.oid));
886 find_commit_subject(message, &body);
887
888 if (command == TODO_SQUASH) {
889 unlink(rebase_path_fixup_msg());
890 strbuf_addf(&buf, "\n%c ", comment_line_char);
891 strbuf_addf(&buf, _("This is the commit message #%d:"), count);
892 strbuf_addstr(&buf, "\n\n");
893 strbuf_addstr(&buf, body);
894 } else if (command == TODO_FIXUP) {
895 strbuf_addf(&buf, "\n%c ", comment_line_char);
896 strbuf_addf(&buf, _("The commit message #%d will be skipped:"),
897 count);
898 strbuf_addstr(&buf, "\n\n");
899 strbuf_add_commented_lines(&buf, body, strlen(body));
900 } else
901 return error(_("unknown command: %d"), command);
902 unuse_commit_buffer(commit, message);
903
904 res = write_message(buf.buf, buf.len, rebase_path_squash_msg(), 0);
905 strbuf_release(&buf);
906 return res;
907}
908
909static void flush_rewritten_pending(void) {
910 struct strbuf buf = STRBUF_INIT;
911 struct object_id newoid;
912 FILE *out;
913
914 if (strbuf_read_file(&buf, rebase_path_rewritten_pending(), (GIT_MAX_HEXSZ + 1) * 2) > 0 &&
915 !get_oid("HEAD", &newoid) &&
916 (out = fopen_or_warn(rebase_path_rewritten_list(), "a"))) {
917 char *bol = buf.buf, *eol;
918
919 while (*bol) {
920 eol = strchrnul(bol, '\n');
921 fprintf(out, "%.*s %s\n", (int)(eol - bol),
922 bol, oid_to_hex(&newoid));
923 if (!*eol)
924 break;
925 bol = eol + 1;
926 }
927 fclose(out);
928 unlink(rebase_path_rewritten_pending());
929 }
930 strbuf_release(&buf);
931}
932
933static void record_in_rewritten(struct object_id *oid,
934 enum todo_command next_command) {
935 FILE *out = fopen_or_warn(rebase_path_rewritten_pending(), "a");
936
937 if (!out)
938 return;
939
940 fprintf(out, "%s\n", oid_to_hex(oid));
941 fclose(out);
942
943 if (!is_fixup(next_command))
944 flush_rewritten_pending();
945}
946
947static int do_pick_commit(enum todo_command command, struct commit *commit,
948 struct replay_opts *opts, int final_fixup)
949{
950 unsigned int flags = opts->edit ? EDIT_MSG : 0;
951 const char *msg_file = opts->edit ? NULL : git_path_merge_msg();
952 struct object_id head;
953 struct commit *base, *next, *parent;
954 const char *base_label, *next_label;
955 struct commit_message msg = { NULL, NULL, NULL, NULL };
956 struct strbuf msgbuf = STRBUF_INIT;
957 int res, unborn = 0, allow;
958
959 if (opts->no_commit) {
960 /*
961 * We do not intend to commit immediately. We just want to
962 * merge the differences in, so let's compute the tree
963 * that represents the "current" state for merge-recursive
964 * to work on.
965 */
966 if (write_cache_as_tree(head.hash, 0, NULL))
967 return error(_("your index file is unmerged."));
968 } else {
969 unborn = get_oid("HEAD", &head);
970 if (unborn)
971 oidcpy(&head, the_hash_algo->empty_tree);
972 if (index_differs_from(unborn ? EMPTY_TREE_SHA1_HEX : "HEAD",
973 NULL, 0))
974 return error_dirty_index(opts);
975 }
976 discard_cache();
977
978 if (!commit->parents)
979 parent = NULL;
980 else if (commit->parents->next) {
981 /* Reverting or cherry-picking a merge commit */
982 int cnt;
983 struct commit_list *p;
984
985 if (!opts->mainline)
986 return error(_("commit %s is a merge but no -m option was given."),
987 oid_to_hex(&commit->object.oid));
988
989 for (cnt = 1, p = commit->parents;
990 cnt != opts->mainline && p;
991 cnt++)
992 p = p->next;
993 if (cnt != opts->mainline || !p)
994 return error(_("commit %s does not have parent %d"),
995 oid_to_hex(&commit->object.oid), opts->mainline);
996 parent = p->item;
997 } else if (0 < opts->mainline)
998 return error(_("mainline was specified but commit %s is not a merge."),
999 oid_to_hex(&commit->object.oid));
1000 else
1001 parent = commit->parents->item;
1002
1003 if (get_message(commit, &msg) != 0)
1004 return error(_("cannot get commit message for %s"),
1005 oid_to_hex(&commit->object.oid));
1006
1007 if (opts->allow_ff && !is_fixup(command) &&
1008 ((parent && !oidcmp(&parent->object.oid, &head)) ||
1009 (!parent && unborn))) {
1010 if (is_rebase_i(opts))
1011 write_author_script(msg.message);
1012 res = fast_forward_to(&commit->object.oid, &head, unborn,
1013 opts);
1014 if (res || command != TODO_REWORD)
1015 goto leave;
1016 flags |= EDIT_MSG | AMEND_MSG | VERIFY_MSG;
1017 msg_file = NULL;
1018 goto fast_forward_edit;
1019 }
1020 if (parent && parse_commit(parent) < 0)
1021 /* TRANSLATORS: The first %s will be a "todo" command like
1022 "revert" or "pick", the second %s a SHA1. */
1023 return error(_("%s: cannot parse parent commit %s"),
1024 command_to_string(command),
1025 oid_to_hex(&parent->object.oid));
1026
1027 /*
1028 * "commit" is an existing commit. We would want to apply
1029 * the difference it introduces since its first parent "prev"
1030 * on top of the current HEAD if we are cherry-pick. Or the
1031 * reverse of it if we are revert.
1032 */
1033
1034 if (command == TODO_REVERT) {
1035 base = commit;
1036 base_label = msg.label;
1037 next = parent;
1038 next_label = msg.parent_label;
1039 strbuf_addstr(&msgbuf, "Revert \"");
1040 strbuf_addstr(&msgbuf, msg.subject);
1041 strbuf_addstr(&msgbuf, "\"\n\nThis reverts commit ");
1042 strbuf_addstr(&msgbuf, oid_to_hex(&commit->object.oid));
1043
1044 if (commit->parents && commit->parents->next) {
1045 strbuf_addstr(&msgbuf, ", reversing\nchanges made to ");
1046 strbuf_addstr(&msgbuf, oid_to_hex(&parent->object.oid));
1047 }
1048 strbuf_addstr(&msgbuf, ".\n");
1049 } else {
1050 const char *p;
1051
1052 base = parent;
1053 base_label = msg.parent_label;
1054 next = commit;
1055 next_label = msg.label;
1056
1057 /* Append the commit log message to msgbuf. */
1058 if (find_commit_subject(msg.message, &p))
1059 strbuf_addstr(&msgbuf, p);
1060
1061 if (opts->record_origin) {
1062 strbuf_complete_line(&msgbuf);
1063 if (!has_conforming_footer(&msgbuf, NULL, 0))
1064 strbuf_addch(&msgbuf, '\n');
1065 strbuf_addstr(&msgbuf, cherry_picked_prefix);
1066 strbuf_addstr(&msgbuf, oid_to_hex(&commit->object.oid));
1067 strbuf_addstr(&msgbuf, ")\n");
1068 }
1069 }
1070
1071 if (command == TODO_REWORD)
1072 flags |= EDIT_MSG | VERIFY_MSG;
1073 else if (is_fixup(command)) {
1074 if (update_squash_messages(command, commit, opts))
1075 return -1;
1076 flags |= AMEND_MSG;
1077 if (!final_fixup)
1078 msg_file = rebase_path_squash_msg();
1079 else if (file_exists(rebase_path_fixup_msg())) {
1080 flags |= CLEANUP_MSG;
1081 msg_file = rebase_path_fixup_msg();
1082 } else {
1083 const char *dest = git_path_squash_msg();
1084 unlink(dest);
1085 if (copy_file(dest, rebase_path_squash_msg(), 0666))
1086 return error(_("could not rename '%s' to '%s'"),
1087 rebase_path_squash_msg(), dest);
1088 unlink(git_path_merge_msg());
1089 msg_file = dest;
1090 flags |= EDIT_MSG;
1091 }
1092 }
1093
1094 if (is_rebase_i(opts) && write_author_script(msg.message) < 0)
1095 res = -1;
1096 else if (!opts->strategy || !strcmp(opts->strategy, "recursive") || command == TODO_REVERT) {
1097 res = do_recursive_merge(base, next, base_label, next_label,
1098 &head, &msgbuf, opts);
1099 if (res < 0)
1100 return res;
1101 res |= write_message(msgbuf.buf, msgbuf.len,
1102 git_path_merge_msg(), 0);
1103 } else {
1104 struct commit_list *common = NULL;
1105 struct commit_list *remotes = NULL;
1106
1107 res = write_message(msgbuf.buf, msgbuf.len,
1108 git_path_merge_msg(), 0);
1109
1110 commit_list_insert(base, &common);
1111 commit_list_insert(next, &remotes);
1112 res |= try_merge_command(opts->strategy,
1113 opts->xopts_nr, (const char **)opts->xopts,
1114 common, oid_to_hex(&head), remotes);
1115 free_commit_list(common);
1116 free_commit_list(remotes);
1117 }
1118 strbuf_release(&msgbuf);
1119
1120 /*
1121 * If the merge was clean or if it failed due to conflict, we write
1122 * CHERRY_PICK_HEAD for the subsequent invocation of commit to use.
1123 * However, if the merge did not even start, then we don't want to
1124 * write it at all.
1125 */
1126 if (command == TODO_PICK && !opts->no_commit && (res == 0 || res == 1) &&
1127 update_ref(NULL, "CHERRY_PICK_HEAD", &commit->object.oid, NULL,
1128 REF_NO_DEREF, UPDATE_REFS_MSG_ON_ERR))
1129 res = -1;
1130 if (command == TODO_REVERT && ((opts->no_commit && res == 0) || res == 1) &&
1131 update_ref(NULL, "REVERT_HEAD", &commit->object.oid, NULL,
1132 REF_NO_DEREF, UPDATE_REFS_MSG_ON_ERR))
1133 res = -1;
1134
1135 if (res) {
1136 error(command == TODO_REVERT
1137 ? _("could not revert %s... %s")
1138 : _("could not apply %s... %s"),
1139 short_commit_name(commit), msg.subject);
1140 print_advice(res == 1, opts);
1141 rerere(opts->allow_rerere_auto);
1142 goto leave;
1143 }
1144
1145 allow = allow_empty(opts, commit);
1146 if (allow < 0) {
1147 res = allow;
1148 goto leave;
1149 } else if (allow)
1150 flags |= ALLOW_EMPTY;
1151 if (!opts->no_commit)
1152fast_forward_edit:
1153 res = run_git_commit(msg_file, opts, flags);
1154
1155 if (!res && final_fixup) {
1156 unlink(rebase_path_fixup_msg());
1157 unlink(rebase_path_squash_msg());
1158 }
1159
1160leave:
1161 free_message(commit, &msg);
1162 update_abort_safety_file();
1163
1164 return res;
1165}
1166
1167static int prepare_revs(struct replay_opts *opts)
1168{
1169 /*
1170 * picking (but not reverting) ranges (but not individual revisions)
1171 * should be done in reverse
1172 */
1173 if (opts->action == REPLAY_PICK && !opts->revs->no_walk)
1174 opts->revs->reverse ^= 1;
1175
1176 if (prepare_revision_walk(opts->revs))
1177 return error(_("revision walk setup failed"));
1178
1179 if (!opts->revs->commits)
1180 return error(_("empty commit set passed"));
1181 return 0;
1182}
1183
1184static int read_and_refresh_cache(struct replay_opts *opts)
1185{
1186 static struct lock_file index_lock;
1187 int index_fd = hold_locked_index(&index_lock, 0);
1188 if (read_index_preload(&the_index, NULL) < 0) {
1189 rollback_lock_file(&index_lock);
1190 return error(_("git %s: failed to read the index"),
1191 _(action_name(opts)));
1192 }
1193 refresh_index(&the_index, REFRESH_QUIET|REFRESH_UNMERGED, NULL, NULL, NULL);
1194 if (the_index.cache_changed && index_fd >= 0) {
1195 if (write_locked_index(&the_index, &index_lock, COMMIT_LOCK)) {
1196 return error(_("git %s: failed to refresh the index"),
1197 _(action_name(opts)));
1198 }
1199 }
1200 rollback_lock_file(&index_lock);
1201 return 0;
1202}
1203
1204struct todo_item {
1205 enum todo_command command;
1206 struct commit *commit;
1207 const char *arg;
1208 int arg_len;
1209 size_t offset_in_buf;
1210};
1211
1212struct todo_list {
1213 struct strbuf buf;
1214 struct todo_item *items;
1215 int nr, alloc, current;
1216 int done_nr, total_nr;
1217 struct stat_data stat;
1218};
1219
1220#define TODO_LIST_INIT { STRBUF_INIT }
1221
1222static void todo_list_release(struct todo_list *todo_list)
1223{
1224 strbuf_release(&todo_list->buf);
1225 FREE_AND_NULL(todo_list->items);
1226 todo_list->nr = todo_list->alloc = 0;
1227}
1228
1229static struct todo_item *append_new_todo(struct todo_list *todo_list)
1230{
1231 ALLOC_GROW(todo_list->items, todo_list->nr + 1, todo_list->alloc);
1232 return todo_list->items + todo_list->nr++;
1233}
1234
1235static int parse_insn_line(struct todo_item *item, const char *bol, char *eol)
1236{
1237 struct object_id commit_oid;
1238 char *end_of_object_name;
1239 int i, saved, status, padding;
1240
1241 /* left-trim */
1242 bol += strspn(bol, " \t");
1243
1244 if (bol == eol || *bol == '\r' || *bol == comment_line_char) {
1245 item->command = TODO_COMMENT;
1246 item->commit = NULL;
1247 item->arg = bol;
1248 item->arg_len = eol - bol;
1249 return 0;
1250 }
1251
1252 for (i = 0; i < TODO_COMMENT; i++)
1253 if (skip_prefix(bol, todo_command_info[i].str, &bol)) {
1254 item->command = i;
1255 break;
1256 } else if (bol[1] == ' ' && *bol == todo_command_info[i].c) {
1257 bol++;
1258 item->command = i;
1259 break;
1260 }
1261 if (i >= TODO_COMMENT)
1262 return -1;
1263
1264 /* Eat up extra spaces/ tabs before object name */
1265 padding = strspn(bol, " \t");
1266 bol += padding;
1267
1268 if (item->command == TODO_NOOP) {
1269 if (bol != eol)
1270 return error(_("%s does not accept arguments: '%s'"),
1271 command_to_string(item->command), bol);
1272 item->commit = NULL;
1273 item->arg = bol;
1274 item->arg_len = eol - bol;
1275 return 0;
1276 }
1277
1278 if (!padding)
1279 return error(_("missing arguments for %s"),
1280 command_to_string(item->command));
1281
1282 if (item->command == TODO_EXEC) {
1283 item->commit = NULL;
1284 item->arg = bol;
1285 item->arg_len = (int)(eol - bol);
1286 return 0;
1287 }
1288
1289 end_of_object_name = (char *) bol + strcspn(bol, " \t\n");
1290 saved = *end_of_object_name;
1291 *end_of_object_name = '\0';
1292 status = get_oid(bol, &commit_oid);
1293 *end_of_object_name = saved;
1294
1295 item->arg = end_of_object_name + strspn(end_of_object_name, " \t");
1296 item->arg_len = (int)(eol - item->arg);
1297
1298 if (status < 0)
1299 return -1;
1300
1301 item->commit = lookup_commit_reference(&commit_oid);
1302 return !item->commit;
1303}
1304
1305static int parse_insn_buffer(char *buf, struct todo_list *todo_list)
1306{
1307 struct todo_item *item;
1308 char *p = buf, *next_p;
1309 int i, res = 0, fixup_okay = file_exists(rebase_path_done());
1310
1311 for (i = 1; *p; i++, p = next_p) {
1312 char *eol = strchrnul(p, '\n');
1313
1314 next_p = *eol ? eol + 1 /* skip LF */ : eol;
1315
1316 if (p != eol && eol[-1] == '\r')
1317 eol--; /* strip Carriage Return */
1318
1319 item = append_new_todo(todo_list);
1320 item->offset_in_buf = p - todo_list->buf.buf;
1321 if (parse_insn_line(item, p, eol)) {
1322 res = error(_("invalid line %d: %.*s"),
1323 i, (int)(eol - p), p);
1324 item->command = TODO_NOOP;
1325 }
1326
1327 if (fixup_okay)
1328 ; /* do nothing */
1329 else if (is_fixup(item->command))
1330 return error(_("cannot '%s' without a previous commit"),
1331 command_to_string(item->command));
1332 else if (!is_noop(item->command))
1333 fixup_okay = 1;
1334 }
1335
1336 return res;
1337}
1338
1339static int count_commands(struct todo_list *todo_list)
1340{
1341 int count = 0, i;
1342
1343 for (i = 0; i < todo_list->nr; i++)
1344 if (todo_list->items[i].command != TODO_COMMENT)
1345 count++;
1346
1347 return count;
1348}
1349
1350static int read_populate_todo(struct todo_list *todo_list,
1351 struct replay_opts *opts)
1352{
1353 struct stat st;
1354 const char *todo_file = get_todo_path(opts);
1355 int fd, res;
1356
1357 strbuf_reset(&todo_list->buf);
1358 fd = open(todo_file, O_RDONLY);
1359 if (fd < 0)
1360 return error_errno(_("could not open '%s'"), todo_file);
1361 if (strbuf_read(&todo_list->buf, fd, 0) < 0) {
1362 close(fd);
1363 return error(_("could not read '%s'."), todo_file);
1364 }
1365 close(fd);
1366
1367 res = stat(todo_file, &st);
1368 if (res)
1369 return error(_("could not stat '%s'"), todo_file);
1370 fill_stat_data(&todo_list->stat, &st);
1371
1372 res = parse_insn_buffer(todo_list->buf.buf, todo_list);
1373 if (res) {
1374 if (is_rebase_i(opts))
1375 return error(_("please fix this using "
1376 "'git rebase --edit-todo'."));
1377 return error(_("unusable instruction sheet: '%s'"), todo_file);
1378 }
1379
1380 if (!todo_list->nr &&
1381 (!is_rebase_i(opts) || !file_exists(rebase_path_done())))
1382 return error(_("no commits parsed."));
1383
1384 if (!is_rebase_i(opts)) {
1385 enum todo_command valid =
1386 opts->action == REPLAY_PICK ? TODO_PICK : TODO_REVERT;
1387 int i;
1388
1389 for (i = 0; i < todo_list->nr; i++)
1390 if (valid == todo_list->items[i].command)
1391 continue;
1392 else if (valid == TODO_PICK)
1393 return error(_("cannot cherry-pick during a revert."));
1394 else
1395 return error(_("cannot revert during a cherry-pick."));
1396 }
1397
1398 if (is_rebase_i(opts)) {
1399 struct todo_list done = TODO_LIST_INIT;
1400 FILE *f = fopen_or_warn(rebase_path_msgtotal(), "w");
1401
1402 if (strbuf_read_file(&done.buf, rebase_path_done(), 0) > 0 &&
1403 !parse_insn_buffer(done.buf.buf, &done))
1404 todo_list->done_nr = count_commands(&done);
1405 else
1406 todo_list->done_nr = 0;
1407
1408 todo_list->total_nr = todo_list->done_nr
1409 + count_commands(todo_list);
1410 todo_list_release(&done);
1411
1412 if (f) {
1413 fprintf(f, "%d\n", todo_list->total_nr);
1414 fclose(f);
1415 }
1416 }
1417
1418 return 0;
1419}
1420
1421static int git_config_string_dup(char **dest,
1422 const char *var, const char *value)
1423{
1424 if (!value)
1425 return config_error_nonbool(var);
1426 free(*dest);
1427 *dest = xstrdup(value);
1428 return 0;
1429}
1430
1431static int populate_opts_cb(const char *key, const char *value, void *data)
1432{
1433 struct replay_opts *opts = data;
1434 int error_flag = 1;
1435
1436 if (!value)
1437 error_flag = 0;
1438 else if (!strcmp(key, "options.no-commit"))
1439 opts->no_commit = git_config_bool_or_int(key, value, &error_flag);
1440 else if (!strcmp(key, "options.edit"))
1441 opts->edit = git_config_bool_or_int(key, value, &error_flag);
1442 else if (!strcmp(key, "options.signoff"))
1443 opts->signoff = git_config_bool_or_int(key, value, &error_flag);
1444 else if (!strcmp(key, "options.record-origin"))
1445 opts->record_origin = git_config_bool_or_int(key, value, &error_flag);
1446 else if (!strcmp(key, "options.allow-ff"))
1447 opts->allow_ff = git_config_bool_or_int(key, value, &error_flag);
1448 else if (!strcmp(key, "options.mainline"))
1449 opts->mainline = git_config_int(key, value);
1450 else if (!strcmp(key, "options.strategy"))
1451 git_config_string_dup(&opts->strategy, key, value);
1452 else if (!strcmp(key, "options.gpg-sign"))
1453 git_config_string_dup(&opts->gpg_sign, key, value);
1454 else if (!strcmp(key, "options.strategy-option")) {
1455 ALLOC_GROW(opts->xopts, opts->xopts_nr + 1, opts->xopts_alloc);
1456 opts->xopts[opts->xopts_nr++] = xstrdup(value);
1457 } else if (!strcmp(key, "options.allow-rerere-auto"))
1458 opts->allow_rerere_auto =
1459 git_config_bool_or_int(key, value, &error_flag) ?
1460 RERERE_AUTOUPDATE : RERERE_NOAUTOUPDATE;
1461 else
1462 return error(_("invalid key: %s"), key);
1463
1464 if (!error_flag)
1465 return error(_("invalid value for %s: %s"), key, value);
1466
1467 return 0;
1468}
1469
1470static void read_strategy_opts(struct replay_opts *opts, struct strbuf *buf)
1471{
1472 int i;
1473
1474 strbuf_reset(buf);
1475 if (!read_oneliner(buf, rebase_path_strategy(), 0))
1476 return;
1477 opts->strategy = strbuf_detach(buf, NULL);
1478 if (!read_oneliner(buf, rebase_path_strategy_opts(), 0))
1479 return;
1480
1481 opts->xopts_nr = split_cmdline(buf->buf, (const char ***)&opts->xopts);
1482 for (i = 0; i < opts->xopts_nr; i++) {
1483 const char *arg = opts->xopts[i];
1484
1485 skip_prefix(arg, "--", &arg);
1486 opts->xopts[i] = xstrdup(arg);
1487 }
1488}
1489
1490static int read_populate_opts(struct replay_opts *opts)
1491{
1492 if (is_rebase_i(opts)) {
1493 struct strbuf buf = STRBUF_INIT;
1494
1495 if (read_oneliner(&buf, rebase_path_gpg_sign_opt(), 1)) {
1496 if (!starts_with(buf.buf, "-S"))
1497 strbuf_reset(&buf);
1498 else {
1499 free(opts->gpg_sign);
1500 opts->gpg_sign = xstrdup(buf.buf + 2);
1501 }
1502 strbuf_reset(&buf);
1503 }
1504
1505 if (read_oneliner(&buf, rebase_path_allow_rerere_autoupdate(), 1)) {
1506 if (!strcmp(buf.buf, "--rerere-autoupdate"))
1507 opts->allow_rerere_auto = RERERE_AUTOUPDATE;
1508 else if (!strcmp(buf.buf, "--no-rerere-autoupdate"))
1509 opts->allow_rerere_auto = RERERE_NOAUTOUPDATE;
1510 strbuf_reset(&buf);
1511 }
1512
1513 if (file_exists(rebase_path_verbose()))
1514 opts->verbose = 1;
1515
1516 read_strategy_opts(opts, &buf);
1517 strbuf_release(&buf);
1518
1519 return 0;
1520 }
1521
1522 if (!file_exists(git_path_opts_file()))
1523 return 0;
1524 /*
1525 * The function git_parse_source(), called from git_config_from_file(),
1526 * may die() in case of a syntactically incorrect file. We do not care
1527 * about this case, though, because we wrote that file ourselves, so we
1528 * are pretty certain that it is syntactically correct.
1529 */
1530 if (git_config_from_file(populate_opts_cb, git_path_opts_file(), opts) < 0)
1531 return error(_("malformed options sheet: '%s'"),
1532 git_path_opts_file());
1533 return 0;
1534}
1535
1536static int walk_revs_populate_todo(struct todo_list *todo_list,
1537 struct replay_opts *opts)
1538{
1539 enum todo_command command = opts->action == REPLAY_PICK ?
1540 TODO_PICK : TODO_REVERT;
1541 const char *command_string = todo_command_info[command].str;
1542 struct commit *commit;
1543
1544 if (prepare_revs(opts))
1545 return -1;
1546
1547 while ((commit = get_revision(opts->revs))) {
1548 struct todo_item *item = append_new_todo(todo_list);
1549 const char *commit_buffer = get_commit_buffer(commit, NULL);
1550 const char *subject;
1551 int subject_len;
1552
1553 item->command = command;
1554 item->commit = commit;
1555 item->arg = NULL;
1556 item->arg_len = 0;
1557 item->offset_in_buf = todo_list->buf.len;
1558 subject_len = find_commit_subject(commit_buffer, &subject);
1559 strbuf_addf(&todo_list->buf, "%s %s %.*s\n", command_string,
1560 short_commit_name(commit), subject_len, subject);
1561 unuse_commit_buffer(commit, commit_buffer);
1562 }
1563 return 0;
1564}
1565
1566static int create_seq_dir(void)
1567{
1568 if (file_exists(git_path_seq_dir())) {
1569 error(_("a cherry-pick or revert is already in progress"));
1570 advise(_("try \"git cherry-pick (--continue | --quit | --abort)\""));
1571 return -1;
1572 } else if (mkdir(git_path_seq_dir(), 0777) < 0)
1573 return error_errno(_("could not create sequencer directory '%s'"),
1574 git_path_seq_dir());
1575 return 0;
1576}
1577
1578static int save_head(const char *head)
1579{
1580 static struct lock_file head_lock;
1581 struct strbuf buf = STRBUF_INIT;
1582 int fd;
1583 ssize_t written;
1584
1585 fd = hold_lock_file_for_update(&head_lock, git_path_head_file(), 0);
1586 if (fd < 0) {
1587 rollback_lock_file(&head_lock);
1588 return error_errno(_("could not lock HEAD"));
1589 }
1590 strbuf_addf(&buf, "%s\n", head);
1591 written = write_in_full(fd, buf.buf, buf.len);
1592 strbuf_release(&buf);
1593 if (written < 0) {
1594 rollback_lock_file(&head_lock);
1595 return error_errno(_("could not write to '%s'"),
1596 git_path_head_file());
1597 }
1598 if (commit_lock_file(&head_lock) < 0) {
1599 rollback_lock_file(&head_lock);
1600 return error(_("failed to finalize '%s'."), git_path_head_file());
1601 }
1602 return 0;
1603}
1604
1605static int rollback_is_safe(void)
1606{
1607 struct strbuf sb = STRBUF_INIT;
1608 struct object_id expected_head, actual_head;
1609
1610 if (strbuf_read_file(&sb, git_path_abort_safety_file(), 0) >= 0) {
1611 strbuf_trim(&sb);
1612 if (get_oid_hex(sb.buf, &expected_head)) {
1613 strbuf_release(&sb);
1614 die(_("could not parse %s"), git_path_abort_safety_file());
1615 }
1616 strbuf_release(&sb);
1617 }
1618 else if (errno == ENOENT)
1619 oidclr(&expected_head);
1620 else
1621 die_errno(_("could not read '%s'"), git_path_abort_safety_file());
1622
1623 if (get_oid("HEAD", &actual_head))
1624 oidclr(&actual_head);
1625
1626 return !oidcmp(&actual_head, &expected_head);
1627}
1628
1629static int reset_for_rollback(const struct object_id *oid)
1630{
1631 const char *argv[4]; /* reset --merge <arg> + NULL */
1632
1633 argv[0] = "reset";
1634 argv[1] = "--merge";
1635 argv[2] = oid_to_hex(oid);
1636 argv[3] = NULL;
1637 return run_command_v_opt(argv, RUN_GIT_CMD);
1638}
1639
1640static int rollback_single_pick(void)
1641{
1642 struct object_id head_oid;
1643
1644 if (!file_exists(git_path_cherry_pick_head()) &&
1645 !file_exists(git_path_revert_head()))
1646 return error(_("no cherry-pick or revert in progress"));
1647 if (read_ref_full("HEAD", 0, &head_oid, NULL))
1648 return error(_("cannot resolve HEAD"));
1649 if (is_null_oid(&head_oid))
1650 return error(_("cannot abort from a branch yet to be born"));
1651 return reset_for_rollback(&head_oid);
1652}
1653
1654int sequencer_rollback(struct replay_opts *opts)
1655{
1656 FILE *f;
1657 struct object_id oid;
1658 struct strbuf buf = STRBUF_INIT;
1659 const char *p;
1660
1661 f = fopen(git_path_head_file(), "r");
1662 if (!f && errno == ENOENT) {
1663 /*
1664 * There is no multiple-cherry-pick in progress.
1665 * If CHERRY_PICK_HEAD or REVERT_HEAD indicates
1666 * a single-cherry-pick in progress, abort that.
1667 */
1668 return rollback_single_pick();
1669 }
1670 if (!f)
1671 return error_errno(_("cannot open '%s'"), git_path_head_file());
1672 if (strbuf_getline_lf(&buf, f)) {
1673 error(_("cannot read '%s': %s"), git_path_head_file(),
1674 ferror(f) ? strerror(errno) : _("unexpected end of file"));
1675 fclose(f);
1676 goto fail;
1677 }
1678 fclose(f);
1679 if (parse_oid_hex(buf.buf, &oid, &p) || *p != '\0') {
1680 error(_("stored pre-cherry-pick HEAD file '%s' is corrupt"),
1681 git_path_head_file());
1682 goto fail;
1683 }
1684 if (is_null_oid(&oid)) {
1685 error(_("cannot abort from a branch yet to be born"));
1686 goto fail;
1687 }
1688
1689 if (!rollback_is_safe()) {
1690 /* Do not error, just do not rollback */
1691 warning(_("You seem to have moved HEAD. "
1692 "Not rewinding, check your HEAD!"));
1693 } else
1694 if (reset_for_rollback(&oid))
1695 goto fail;
1696 strbuf_release(&buf);
1697 return sequencer_remove_state(opts);
1698fail:
1699 strbuf_release(&buf);
1700 return -1;
1701}
1702
1703static int save_todo(struct todo_list *todo_list, struct replay_opts *opts)
1704{
1705 static struct lock_file todo_lock;
1706 const char *todo_path = get_todo_path(opts);
1707 int next = todo_list->current, offset, fd;
1708
1709 /*
1710 * rebase -i writes "git-rebase-todo" without the currently executing
1711 * command, appending it to "done" instead.
1712 */
1713 if (is_rebase_i(opts))
1714 next++;
1715
1716 fd = hold_lock_file_for_update(&todo_lock, todo_path, 0);
1717 if (fd < 0)
1718 return error_errno(_("could not lock '%s'"), todo_path);
1719 offset = next < todo_list->nr ?
1720 todo_list->items[next].offset_in_buf : todo_list->buf.len;
1721 if (write_in_full(fd, todo_list->buf.buf + offset,
1722 todo_list->buf.len - offset) < 0)
1723 return error_errno(_("could not write to '%s'"), todo_path);
1724 if (commit_lock_file(&todo_lock) < 0)
1725 return error(_("failed to finalize '%s'."), todo_path);
1726
1727 if (is_rebase_i(opts)) {
1728 const char *done_path = rebase_path_done();
1729 int fd = open(done_path, O_CREAT | O_WRONLY | O_APPEND, 0666);
1730 int prev_offset = !next ? 0 :
1731 todo_list->items[next - 1].offset_in_buf;
1732
1733 if (fd >= 0 && offset > prev_offset &&
1734 write_in_full(fd, todo_list->buf.buf + prev_offset,
1735 offset - prev_offset) < 0) {
1736 close(fd);
1737 return error_errno(_("could not write to '%s'"),
1738 done_path);
1739 }
1740 if (fd >= 0)
1741 close(fd);
1742 }
1743 return 0;
1744}
1745
1746static int save_opts(struct replay_opts *opts)
1747{
1748 const char *opts_file = git_path_opts_file();
1749 int res = 0;
1750
1751 if (opts->no_commit)
1752 res |= git_config_set_in_file_gently(opts_file, "options.no-commit", "true");
1753 if (opts->edit)
1754 res |= git_config_set_in_file_gently(opts_file, "options.edit", "true");
1755 if (opts->signoff)
1756 res |= git_config_set_in_file_gently(opts_file, "options.signoff", "true");
1757 if (opts->record_origin)
1758 res |= git_config_set_in_file_gently(opts_file, "options.record-origin", "true");
1759 if (opts->allow_ff)
1760 res |= git_config_set_in_file_gently(opts_file, "options.allow-ff", "true");
1761 if (opts->mainline) {
1762 struct strbuf buf = STRBUF_INIT;
1763 strbuf_addf(&buf, "%d", opts->mainline);
1764 res |= git_config_set_in_file_gently(opts_file, "options.mainline", buf.buf);
1765 strbuf_release(&buf);
1766 }
1767 if (opts->strategy)
1768 res |= git_config_set_in_file_gently(opts_file, "options.strategy", opts->strategy);
1769 if (opts->gpg_sign)
1770 res |= git_config_set_in_file_gently(opts_file, "options.gpg-sign", opts->gpg_sign);
1771 if (opts->xopts) {
1772 int i;
1773 for (i = 0; i < opts->xopts_nr; i++)
1774 res |= git_config_set_multivar_in_file_gently(opts_file,
1775 "options.strategy-option",
1776 opts->xopts[i], "^$", 0);
1777 }
1778 if (opts->allow_rerere_auto)
1779 res |= git_config_set_in_file_gently(opts_file, "options.allow-rerere-auto",
1780 opts->allow_rerere_auto == RERERE_AUTOUPDATE ?
1781 "true" : "false");
1782 return res;
1783}
1784
1785static int make_patch(struct commit *commit, struct replay_opts *opts)
1786{
1787 struct strbuf buf = STRBUF_INIT;
1788 struct rev_info log_tree_opt;
1789 const char *subject, *p;
1790 int res = 0;
1791
1792 p = short_commit_name(commit);
1793 if (write_message(p, strlen(p), rebase_path_stopped_sha(), 1) < 0)
1794 return -1;
1795 if (update_ref("rebase", "REBASE_HEAD", &commit->object.oid,
1796 NULL, REF_NO_DEREF, UPDATE_REFS_MSG_ON_ERR))
1797 res |= error(_("could not update %s"), "REBASE_HEAD");
1798
1799 strbuf_addf(&buf, "%s/patch", get_dir(opts));
1800 memset(&log_tree_opt, 0, sizeof(log_tree_opt));
1801 init_revisions(&log_tree_opt, NULL);
1802 log_tree_opt.abbrev = 0;
1803 log_tree_opt.diff = 1;
1804 log_tree_opt.diffopt.output_format = DIFF_FORMAT_PATCH;
1805 log_tree_opt.disable_stdin = 1;
1806 log_tree_opt.no_commit_id = 1;
1807 log_tree_opt.diffopt.file = fopen(buf.buf, "w");
1808 log_tree_opt.diffopt.use_color = GIT_COLOR_NEVER;
1809 if (!log_tree_opt.diffopt.file)
1810 res |= error_errno(_("could not open '%s'"), buf.buf);
1811 else {
1812 res |= log_tree_commit(&log_tree_opt, commit);
1813 fclose(log_tree_opt.diffopt.file);
1814 }
1815 strbuf_reset(&buf);
1816
1817 strbuf_addf(&buf, "%s/message", get_dir(opts));
1818 if (!file_exists(buf.buf)) {
1819 const char *commit_buffer = get_commit_buffer(commit, NULL);
1820 find_commit_subject(commit_buffer, &subject);
1821 res |= write_message(subject, strlen(subject), buf.buf, 1);
1822 unuse_commit_buffer(commit, commit_buffer);
1823 }
1824 strbuf_release(&buf);
1825
1826 return res;
1827}
1828
1829static int intend_to_amend(void)
1830{
1831 struct object_id head;
1832 char *p;
1833
1834 if (get_oid("HEAD", &head))
1835 return error(_("cannot read HEAD"));
1836
1837 p = oid_to_hex(&head);
1838 return write_message(p, strlen(p), rebase_path_amend(), 1);
1839}
1840
1841static int error_with_patch(struct commit *commit,
1842 const char *subject, int subject_len,
1843 struct replay_opts *opts, int exit_code, int to_amend)
1844{
1845 if (make_patch(commit, opts))
1846 return -1;
1847
1848 if (to_amend) {
1849 if (intend_to_amend())
1850 return -1;
1851
1852 fprintf(stderr, "You can amend the commit now, with\n"
1853 "\n"
1854 " git commit --amend %s\n"
1855 "\n"
1856 "Once you are satisfied with your changes, run\n"
1857 "\n"
1858 " git rebase --continue\n", gpg_sign_opt_quoted(opts));
1859 } else if (exit_code)
1860 fprintf(stderr, "Could not apply %s... %.*s\n",
1861 short_commit_name(commit), subject_len, subject);
1862
1863 return exit_code;
1864}
1865
1866static int error_failed_squash(struct commit *commit,
1867 struct replay_opts *opts, int subject_len, const char *subject)
1868{
1869 if (rename(rebase_path_squash_msg(), rebase_path_message()))
1870 return error(_("could not rename '%s' to '%s'"),
1871 rebase_path_squash_msg(), rebase_path_message());
1872 unlink(rebase_path_fixup_msg());
1873 unlink(git_path_merge_msg());
1874 if (copy_file(git_path_merge_msg(), rebase_path_message(), 0666))
1875 return error(_("could not copy '%s' to '%s'"),
1876 rebase_path_message(), git_path_merge_msg());
1877 return error_with_patch(commit, subject, subject_len, opts, 1, 0);
1878}
1879
1880static int do_exec(const char *command_line)
1881{
1882 struct argv_array child_env = ARGV_ARRAY_INIT;
1883 const char *child_argv[] = { NULL, NULL };
1884 int dirty, status;
1885
1886 fprintf(stderr, "Executing: %s\n", command_line);
1887 child_argv[0] = command_line;
1888 argv_array_pushf(&child_env, "GIT_DIR=%s", absolute_path(get_git_dir()));
1889 status = run_command_v_opt_cd_env(child_argv, RUN_USING_SHELL, NULL,
1890 child_env.argv);
1891
1892 /* force re-reading of the cache */
1893 if (discard_cache() < 0 || read_cache() < 0)
1894 return error(_("could not read index"));
1895
1896 dirty = require_clean_work_tree("rebase", NULL, 1, 1);
1897
1898 if (status) {
1899 warning(_("execution failed: %s\n%s"
1900 "You can fix the problem, and then run\n"
1901 "\n"
1902 " git rebase --continue\n"
1903 "\n"),
1904 command_line,
1905 dirty ? N_("and made changes to the index and/or the "
1906 "working tree\n") : "");
1907 if (status == 127)
1908 /* command not found */
1909 status = 1;
1910 } else if (dirty) {
1911 warning(_("execution succeeded: %s\nbut "
1912 "left changes to the index and/or the working tree\n"
1913 "Commit or stash your changes, and then run\n"
1914 "\n"
1915 " git rebase --continue\n"
1916 "\n"), command_line);
1917 status = 1;
1918 }
1919
1920 argv_array_clear(&child_env);
1921
1922 return status;
1923}
1924
1925static int is_final_fixup(struct todo_list *todo_list)
1926{
1927 int i = todo_list->current;
1928
1929 if (!is_fixup(todo_list->items[i].command))
1930 return 0;
1931
1932 while (++i < todo_list->nr)
1933 if (is_fixup(todo_list->items[i].command))
1934 return 0;
1935 else if (!is_noop(todo_list->items[i].command))
1936 break;
1937 return 1;
1938}
1939
1940static enum todo_command peek_command(struct todo_list *todo_list, int offset)
1941{
1942 int i;
1943
1944 for (i = todo_list->current + offset; i < todo_list->nr; i++)
1945 if (!is_noop(todo_list->items[i].command))
1946 return todo_list->items[i].command;
1947
1948 return -1;
1949}
1950
1951static int apply_autostash(struct replay_opts *opts)
1952{
1953 struct strbuf stash_sha1 = STRBUF_INIT;
1954 struct child_process child = CHILD_PROCESS_INIT;
1955 int ret = 0;
1956
1957 if (!read_oneliner(&stash_sha1, rebase_path_autostash(), 1)) {
1958 strbuf_release(&stash_sha1);
1959 return 0;
1960 }
1961 strbuf_trim(&stash_sha1);
1962
1963 child.git_cmd = 1;
1964 child.no_stdout = 1;
1965 child.no_stderr = 1;
1966 argv_array_push(&child.args, "stash");
1967 argv_array_push(&child.args, "apply");
1968 argv_array_push(&child.args, stash_sha1.buf);
1969 if (!run_command(&child))
1970 fprintf(stderr, _("Applied autostash.\n"));
1971 else {
1972 struct child_process store = CHILD_PROCESS_INIT;
1973
1974 store.git_cmd = 1;
1975 argv_array_push(&store.args, "stash");
1976 argv_array_push(&store.args, "store");
1977 argv_array_push(&store.args, "-m");
1978 argv_array_push(&store.args, "autostash");
1979 argv_array_push(&store.args, "-q");
1980 argv_array_push(&store.args, stash_sha1.buf);
1981 if (run_command(&store))
1982 ret = error(_("cannot store %s"), stash_sha1.buf);
1983 else
1984 fprintf(stderr,
1985 _("Applying autostash resulted in conflicts.\n"
1986 "Your changes are safe in the stash.\n"
1987 "You can run \"git stash pop\" or"
1988 " \"git stash drop\" at any time.\n"));
1989 }
1990
1991 strbuf_release(&stash_sha1);
1992 return ret;
1993}
1994
1995static const char *reflog_message(struct replay_opts *opts,
1996 const char *sub_action, const char *fmt, ...)
1997{
1998 va_list ap;
1999 static struct strbuf buf = STRBUF_INIT;
2000
2001 va_start(ap, fmt);
2002 strbuf_reset(&buf);
2003 strbuf_addstr(&buf, action_name(opts));
2004 if (sub_action)
2005 strbuf_addf(&buf, " (%s)", sub_action);
2006 if (fmt) {
2007 strbuf_addstr(&buf, ": ");
2008 strbuf_vaddf(&buf, fmt, ap);
2009 }
2010 va_end(ap);
2011
2012 return buf.buf;
2013}
2014
2015static int pick_commits(struct todo_list *todo_list, struct replay_opts *opts)
2016{
2017 int res = 0;
2018
2019 setenv(GIT_REFLOG_ACTION, action_name(opts), 0);
2020 if (opts->allow_ff)
2021 assert(!(opts->signoff || opts->no_commit ||
2022 opts->record_origin || opts->edit));
2023 if (read_and_refresh_cache(opts))
2024 return -1;
2025
2026 while (todo_list->current < todo_list->nr) {
2027 struct todo_item *item = todo_list->items + todo_list->current;
2028 if (save_todo(todo_list, opts))
2029 return -1;
2030 if (is_rebase_i(opts)) {
2031 if (item->command != TODO_COMMENT) {
2032 FILE *f = fopen(rebase_path_msgnum(), "w");
2033
2034 todo_list->done_nr++;
2035
2036 if (f) {
2037 fprintf(f, "%d\n", todo_list->done_nr);
2038 fclose(f);
2039 }
2040 fprintf(stderr, "Rebasing (%d/%d)%s",
2041 todo_list->done_nr,
2042 todo_list->total_nr,
2043 opts->verbose ? "\n" : "\r");
2044 }
2045 unlink(rebase_path_message());
2046 unlink(rebase_path_author_script());
2047 unlink(rebase_path_stopped_sha());
2048 unlink(rebase_path_amend());
2049 delete_ref(NULL, "REBASE_HEAD", NULL, REF_NO_DEREF);
2050 }
2051 if (item->command <= TODO_SQUASH) {
2052 if (is_rebase_i(opts))
2053 setenv("GIT_REFLOG_ACTION", reflog_message(opts,
2054 command_to_string(item->command), NULL),
2055 1);
2056 res = do_pick_commit(item->command, item->commit,
2057 opts, is_final_fixup(todo_list));
2058 if (is_rebase_i(opts) && res < 0) {
2059 /* Reschedule */
2060 todo_list->current--;
2061 if (save_todo(todo_list, opts))
2062 return -1;
2063 }
2064 if (item->command == TODO_EDIT) {
2065 struct commit *commit = item->commit;
2066 if (!res)
2067 fprintf(stderr,
2068 _("Stopped at %s... %.*s\n"),
2069 short_commit_name(commit),
2070 item->arg_len, item->arg);
2071 return error_with_patch(commit,
2072 item->arg, item->arg_len, opts, res,
2073 !res);
2074 }
2075 if (is_rebase_i(opts) && !res)
2076 record_in_rewritten(&item->commit->object.oid,
2077 peek_command(todo_list, 1));
2078 if (res && is_fixup(item->command)) {
2079 if (res == 1)
2080 intend_to_amend();
2081 return error_failed_squash(item->commit, opts,
2082 item->arg_len, item->arg);
2083 } else if (res && is_rebase_i(opts))
2084 return res | error_with_patch(item->commit,
2085 item->arg, item->arg_len, opts, res,
2086 item->command == TODO_REWORD);
2087 } else if (item->command == TODO_EXEC) {
2088 char *end_of_arg = (char *)(item->arg + item->arg_len);
2089 int saved = *end_of_arg;
2090 struct stat st;
2091
2092 *end_of_arg = '\0';
2093 res = do_exec(item->arg);
2094 *end_of_arg = saved;
2095
2096 /* Reread the todo file if it has changed. */
2097 if (res)
2098 ; /* fall through */
2099 else if (stat(get_todo_path(opts), &st))
2100 res = error_errno(_("could not stat '%s'"),
2101 get_todo_path(opts));
2102 else if (match_stat_data(&todo_list->stat, &st)) {
2103 todo_list_release(todo_list);
2104 if (read_populate_todo(todo_list, opts))
2105 res = -1; /* message was printed */
2106 /* `current` will be incremented below */
2107 todo_list->current = -1;
2108 }
2109 } else if (!is_noop(item->command))
2110 return error(_("unknown command %d"), item->command);
2111
2112 todo_list->current++;
2113 if (res)
2114 return res;
2115 }
2116
2117 if (is_rebase_i(opts)) {
2118 struct strbuf head_ref = STRBUF_INIT, buf = STRBUF_INIT;
2119 struct stat st;
2120
2121 /* Stopped in the middle, as planned? */
2122 if (todo_list->current < todo_list->nr)
2123 return 0;
2124
2125 if (read_oneliner(&head_ref, rebase_path_head_name(), 0) &&
2126 starts_with(head_ref.buf, "refs/")) {
2127 const char *msg;
2128 struct object_id head, orig;
2129 int res;
2130
2131 if (get_oid("HEAD", &head)) {
2132 res = error(_("cannot read HEAD"));
2133cleanup_head_ref:
2134 strbuf_release(&head_ref);
2135 strbuf_release(&buf);
2136 return res;
2137 }
2138 if (!read_oneliner(&buf, rebase_path_orig_head(), 0) ||
2139 get_oid_hex(buf.buf, &orig)) {
2140 res = error(_("could not read orig-head"));
2141 goto cleanup_head_ref;
2142 }
2143 strbuf_reset(&buf);
2144 if (!read_oneliner(&buf, rebase_path_onto(), 0)) {
2145 res = error(_("could not read 'onto'"));
2146 goto cleanup_head_ref;
2147 }
2148 msg = reflog_message(opts, "finish", "%s onto %s",
2149 head_ref.buf, buf.buf);
2150 if (update_ref(msg, head_ref.buf, &head, &orig,
2151 REF_NO_DEREF, UPDATE_REFS_MSG_ON_ERR)) {
2152 res = error(_("could not update %s"),
2153 head_ref.buf);
2154 goto cleanup_head_ref;
2155 }
2156 msg = reflog_message(opts, "finish", "returning to %s",
2157 head_ref.buf);
2158 if (create_symref("HEAD", head_ref.buf, msg)) {
2159 res = error(_("could not update HEAD to %s"),
2160 head_ref.buf);
2161 goto cleanup_head_ref;
2162 }
2163 strbuf_reset(&buf);
2164 }
2165
2166 if (opts->verbose) {
2167 struct rev_info log_tree_opt;
2168 struct object_id orig, head;
2169
2170 memset(&log_tree_opt, 0, sizeof(log_tree_opt));
2171 init_revisions(&log_tree_opt, NULL);
2172 log_tree_opt.diff = 1;
2173 log_tree_opt.diffopt.output_format =
2174 DIFF_FORMAT_DIFFSTAT;
2175 log_tree_opt.disable_stdin = 1;
2176
2177 if (read_oneliner(&buf, rebase_path_orig_head(), 0) &&
2178 !get_oid(buf.buf, &orig) &&
2179 !get_oid("HEAD", &head)) {
2180 diff_tree_oid(&orig, &head, "",
2181 &log_tree_opt.diffopt);
2182 log_tree_diff_flush(&log_tree_opt);
2183 }
2184 }
2185 flush_rewritten_pending();
2186 if (!stat(rebase_path_rewritten_list(), &st) &&
2187 st.st_size > 0) {
2188 struct child_process child = CHILD_PROCESS_INIT;
2189 const char *post_rewrite_hook =
2190 find_hook("post-rewrite");
2191
2192 child.in = open(rebase_path_rewritten_list(), O_RDONLY);
2193 child.git_cmd = 1;
2194 argv_array_push(&child.args, "notes");
2195 argv_array_push(&child.args, "copy");
2196 argv_array_push(&child.args, "--for-rewrite=rebase");
2197 /* we don't care if this copying failed */
2198 run_command(&child);
2199
2200 if (post_rewrite_hook) {
2201 struct child_process hook = CHILD_PROCESS_INIT;
2202
2203 hook.in = open(rebase_path_rewritten_list(),
2204 O_RDONLY);
2205 hook.stdout_to_stderr = 1;
2206 argv_array_push(&hook.args, post_rewrite_hook);
2207 argv_array_push(&hook.args, "rebase");
2208 /* we don't care if this hook failed */
2209 run_command(&hook);
2210 }
2211 }
2212 apply_autostash(opts);
2213
2214 fprintf(stderr, "Successfully rebased and updated %s.\n",
2215 head_ref.buf);
2216
2217 strbuf_release(&buf);
2218 strbuf_release(&head_ref);
2219 }
2220
2221 /*
2222 * Sequence of picks finished successfully; cleanup by
2223 * removing the .git/sequencer directory
2224 */
2225 return sequencer_remove_state(opts);
2226}
2227
2228static int continue_single_pick(void)
2229{
2230 const char *argv[] = { "commit", NULL };
2231
2232 if (!file_exists(git_path_cherry_pick_head()) &&
2233 !file_exists(git_path_revert_head()))
2234 return error(_("no cherry-pick or revert in progress"));
2235 return run_command_v_opt(argv, RUN_GIT_CMD);
2236}
2237
2238static int commit_staged_changes(struct replay_opts *opts)
2239{
2240 unsigned int flags = ALLOW_EMPTY | EDIT_MSG;
2241
2242 if (has_unstaged_changes(1))
2243 return error(_("cannot rebase: You have unstaged changes."));
2244 if (!has_uncommitted_changes(0)) {
2245 const char *cherry_pick_head = git_path_cherry_pick_head();
2246
2247 if (file_exists(cherry_pick_head) && unlink(cherry_pick_head))
2248 return error(_("could not remove CHERRY_PICK_HEAD"));
2249 return 0;
2250 }
2251
2252 if (file_exists(rebase_path_amend())) {
2253 struct strbuf rev = STRBUF_INIT;
2254 struct object_id head, to_amend;
2255
2256 if (get_oid("HEAD", &head))
2257 return error(_("cannot amend non-existing commit"));
2258 if (!read_oneliner(&rev, rebase_path_amend(), 0))
2259 return error(_("invalid file: '%s'"), rebase_path_amend());
2260 if (get_oid_hex(rev.buf, &to_amend))
2261 return error(_("invalid contents: '%s'"),
2262 rebase_path_amend());
2263 if (oidcmp(&head, &to_amend))
2264 return error(_("\nYou have uncommitted changes in your "
2265 "working tree. Please, commit them\n"
2266 "first and then run 'git rebase "
2267 "--continue' again."));
2268
2269 strbuf_release(&rev);
2270 flags |= AMEND_MSG;
2271 }
2272
2273 if (run_git_commit(rebase_path_message(), opts, flags))
2274 return error(_("could not commit staged changes."));
2275 unlink(rebase_path_amend());
2276 return 0;
2277}
2278
2279int sequencer_continue(struct replay_opts *opts)
2280{
2281 struct todo_list todo_list = TODO_LIST_INIT;
2282 int res;
2283
2284 if (read_and_refresh_cache(opts))
2285 return -1;
2286
2287 if (is_rebase_i(opts)) {
2288 if (commit_staged_changes(opts))
2289 return -1;
2290 } else if (!file_exists(get_todo_path(opts)))
2291 return continue_single_pick();
2292 if (read_populate_opts(opts))
2293 return -1;
2294 if ((res = read_populate_todo(&todo_list, opts)))
2295 goto release_todo_list;
2296
2297 if (!is_rebase_i(opts)) {
2298 /* Verify that the conflict has been resolved */
2299 if (file_exists(git_path_cherry_pick_head()) ||
2300 file_exists(git_path_revert_head())) {
2301 res = continue_single_pick();
2302 if (res)
2303 goto release_todo_list;
2304 }
2305 if (index_differs_from("HEAD", NULL, 0)) {
2306 res = error_dirty_index(opts);
2307 goto release_todo_list;
2308 }
2309 todo_list.current++;
2310 } else if (file_exists(rebase_path_stopped_sha())) {
2311 struct strbuf buf = STRBUF_INIT;
2312 struct object_id oid;
2313
2314 if (read_oneliner(&buf, rebase_path_stopped_sha(), 1) &&
2315 !get_oid_committish(buf.buf, &oid))
2316 record_in_rewritten(&oid, peek_command(&todo_list, 0));
2317 strbuf_release(&buf);
2318 }
2319
2320 res = pick_commits(&todo_list, opts);
2321release_todo_list:
2322 todo_list_release(&todo_list);
2323 return res;
2324}
2325
2326static int single_pick(struct commit *cmit, struct replay_opts *opts)
2327{
2328 setenv(GIT_REFLOG_ACTION, action_name(opts), 0);
2329 return do_pick_commit(opts->action == REPLAY_PICK ?
2330 TODO_PICK : TODO_REVERT, cmit, opts, 0);
2331}
2332
2333int sequencer_pick_revisions(struct replay_opts *opts)
2334{
2335 struct todo_list todo_list = TODO_LIST_INIT;
2336 struct object_id oid;
2337 int i, res;
2338
2339 assert(opts->revs);
2340 if (read_and_refresh_cache(opts))
2341 return -1;
2342
2343 for (i = 0; i < opts->revs->pending.nr; i++) {
2344 struct object_id oid;
2345 const char *name = opts->revs->pending.objects[i].name;
2346
2347 /* This happens when using --stdin. */
2348 if (!strlen(name))
2349 continue;
2350
2351 if (!get_oid(name, &oid)) {
2352 if (!lookup_commit_reference_gently(&oid, 1)) {
2353 enum object_type type = sha1_object_info(oid.hash, NULL);
2354 return error(_("%s: can't cherry-pick a %s"),
2355 name, typename(type));
2356 }
2357 } else
2358 return error(_("%s: bad revision"), name);
2359 }
2360
2361 /*
2362 * If we were called as "git cherry-pick <commit>", just
2363 * cherry-pick/revert it, set CHERRY_PICK_HEAD /
2364 * REVERT_HEAD, and don't touch the sequencer state.
2365 * This means it is possible to cherry-pick in the middle
2366 * of a cherry-pick sequence.
2367 */
2368 if (opts->revs->cmdline.nr == 1 &&
2369 opts->revs->cmdline.rev->whence == REV_CMD_REV &&
2370 opts->revs->no_walk &&
2371 !opts->revs->cmdline.rev->flags) {
2372 struct commit *cmit;
2373 if (prepare_revision_walk(opts->revs))
2374 return error(_("revision walk setup failed"));
2375 cmit = get_revision(opts->revs);
2376 if (!cmit || get_revision(opts->revs))
2377 return error("BUG: expected exactly one commit from walk");
2378 return single_pick(cmit, opts);
2379 }
2380
2381 /*
2382 * Start a new cherry-pick/ revert sequence; but
2383 * first, make sure that an existing one isn't in
2384 * progress
2385 */
2386
2387 if (walk_revs_populate_todo(&todo_list, opts) ||
2388 create_seq_dir() < 0)
2389 return -1;
2390 if (get_oid("HEAD", &oid) && (opts->action == REPLAY_REVERT))
2391 return error(_("can't revert as initial commit"));
2392 if (save_head(oid_to_hex(&oid)))
2393 return -1;
2394 if (save_opts(opts))
2395 return -1;
2396 update_abort_safety_file();
2397 res = pick_commits(&todo_list, opts);
2398 todo_list_release(&todo_list);
2399 return res;
2400}
2401
2402void append_signoff(struct strbuf *msgbuf, int ignore_footer, unsigned flag)
2403{
2404 unsigned no_dup_sob = flag & APPEND_SIGNOFF_DEDUP;
2405 struct strbuf sob = STRBUF_INIT;
2406 int has_footer;
2407
2408 strbuf_addstr(&sob, sign_off_header);
2409 strbuf_addstr(&sob, fmt_name(getenv("GIT_COMMITTER_NAME"),
2410 getenv("GIT_COMMITTER_EMAIL")));
2411 strbuf_addch(&sob, '\n');
2412
2413 if (!ignore_footer)
2414 strbuf_complete_line(msgbuf);
2415
2416 /*
2417 * If the whole message buffer is equal to the sob, pretend that we
2418 * found a conforming footer with a matching sob
2419 */
2420 if (msgbuf->len - ignore_footer == sob.len &&
2421 !strncmp(msgbuf->buf, sob.buf, sob.len))
2422 has_footer = 3;
2423 else
2424 has_footer = has_conforming_footer(msgbuf, &sob, ignore_footer);
2425
2426 if (!has_footer) {
2427 const char *append_newlines = NULL;
2428 size_t len = msgbuf->len - ignore_footer;
2429
2430 if (!len) {
2431 /*
2432 * The buffer is completely empty. Leave foom for
2433 * the title and body to be filled in by the user.
2434 */
2435 append_newlines = "\n\n";
2436 } else if (len == 1) {
2437 /*
2438 * Buffer contains a single newline. Add another
2439 * so that we leave room for the title and body.
2440 */
2441 append_newlines = "\n";
2442 } else if (msgbuf->buf[len - 2] != '\n') {
2443 /*
2444 * Buffer ends with a single newline. Add another
2445 * so that there is an empty line between the message
2446 * body and the sob.
2447 */
2448 append_newlines = "\n";
2449 } /* else, the buffer already ends with two newlines. */
2450
2451 if (append_newlines)
2452 strbuf_splice(msgbuf, msgbuf->len - ignore_footer, 0,
2453 append_newlines, strlen(append_newlines));
2454 }
2455
2456 if (has_footer != 3 && (!no_dup_sob || has_footer != 2))
2457 strbuf_splice(msgbuf, msgbuf->len - ignore_footer, 0,
2458 sob.buf, sob.len);
2459
2460 strbuf_release(&sob);
2461}
2462
2463int sequencer_make_script(FILE *out, int argc, const char **argv,
2464 unsigned flags)
2465{
2466 char *format = NULL;
2467 struct pretty_print_context pp = {0};
2468 struct strbuf buf = STRBUF_INIT;
2469 struct rev_info revs;
2470 struct commit *commit;
2471 int keep_empty = flags & TODO_LIST_KEEP_EMPTY;
2472 const char *insn = flags & TODO_LIST_ABBREVIATE_CMDS ? "p" : "pick";
2473
2474 init_revisions(&revs, NULL);
2475 revs.verbose_header = 1;
2476 revs.max_parents = 1;
2477 revs.cherry_pick = 1;
2478 revs.limited = 1;
2479 revs.reverse = 1;
2480 revs.right_only = 1;
2481 revs.sort_order = REV_SORT_IN_GRAPH_ORDER;
2482 revs.topo_order = 1;
2483
2484 revs.pretty_given = 1;
2485 git_config_get_string("rebase.instructionFormat", &format);
2486 if (!format || !*format) {
2487 free(format);
2488 format = xstrdup("%s");
2489 }
2490 get_commit_format(format, &revs);
2491 free(format);
2492 pp.fmt = revs.commit_format;
2493 pp.output_encoding = get_log_output_encoding();
2494
2495 if (setup_revisions(argc, argv, &revs, NULL) > 1)
2496 return error(_("make_script: unhandled options"));
2497
2498 if (prepare_revision_walk(&revs) < 0)
2499 return error(_("make_script: error preparing revisions"));
2500
2501 while ((commit = get_revision(&revs))) {
2502 strbuf_reset(&buf);
2503 if (!keep_empty && is_original_commit_empty(commit))
2504 strbuf_addf(&buf, "%c ", comment_line_char);
2505 strbuf_addf(&buf, "%s %s ", insn,
2506 oid_to_hex(&commit->object.oid));
2507 pretty_print_commit(&pp, commit, &buf);
2508 strbuf_addch(&buf, '\n');
2509 fputs(buf.buf, out);
2510 }
2511 strbuf_release(&buf);
2512 return 0;
2513}
2514
2515/*
2516 * Add commands after pick and (series of) squash/fixup commands
2517 * in the todo list.
2518 */
2519int sequencer_add_exec_commands(const char *commands)
2520{
2521 const char *todo_file = rebase_path_todo();
2522 struct todo_list todo_list = TODO_LIST_INIT;
2523 struct todo_item *item;
2524 struct strbuf *buf = &todo_list.buf;
2525 size_t offset = 0, commands_len = strlen(commands);
2526 int i, first;
2527
2528 if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
2529 return error(_("could not read '%s'."), todo_file);
2530
2531 if (parse_insn_buffer(todo_list.buf.buf, &todo_list)) {
2532 todo_list_release(&todo_list);
2533 return error(_("unusable todo list: '%s'"), todo_file);
2534 }
2535
2536 first = 1;
2537 /* insert <commands> before every pick except the first one */
2538 for (item = todo_list.items, i = 0; i < todo_list.nr; i++, item++) {
2539 if (item->command == TODO_PICK && !first) {
2540 strbuf_insert(buf, item->offset_in_buf + offset,
2541 commands, commands_len);
2542 offset += commands_len;
2543 }
2544 first = 0;
2545 }
2546
2547 /* append final <commands> */
2548 strbuf_add(buf, commands, commands_len);
2549
2550 i = write_message(buf->buf, buf->len, todo_file, 0);
2551 todo_list_release(&todo_list);
2552 return i;
2553}
2554
2555int transform_todos(unsigned flags)
2556{
2557 const char *todo_file = rebase_path_todo();
2558 struct todo_list todo_list = TODO_LIST_INIT;
2559 struct strbuf buf = STRBUF_INIT;
2560 struct todo_item *item;
2561 int i;
2562
2563 if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
2564 return error(_("could not read '%s'."), todo_file);
2565
2566 if (parse_insn_buffer(todo_list.buf.buf, &todo_list)) {
2567 todo_list_release(&todo_list);
2568 return error(_("unusable todo list: '%s'"), todo_file);
2569 }
2570
2571 for (item = todo_list.items, i = 0; i < todo_list.nr; i++, item++) {
2572 /* if the item is not a command write it and continue */
2573 if (item->command >= TODO_COMMENT) {
2574 strbuf_addf(&buf, "%.*s\n", item->arg_len, item->arg);
2575 continue;
2576 }
2577
2578 /* add command to the buffer */
2579 if (flags & TODO_LIST_ABBREVIATE_CMDS)
2580 strbuf_addch(&buf, command_to_char(item->command));
2581 else
2582 strbuf_addstr(&buf, command_to_string(item->command));
2583
2584 /* add commit id */
2585 if (item->commit) {
2586 const char *oid = flags & TODO_LIST_SHORTEN_IDS ?
2587 short_commit_name(item->commit) :
2588 oid_to_hex(&item->commit->object.oid);
2589
2590 strbuf_addf(&buf, " %s", oid);
2591 }
2592 /* add all the rest */
2593 if (!item->arg_len)
2594 strbuf_addch(&buf, '\n');
2595 else
2596 strbuf_addf(&buf, " %.*s\n", item->arg_len, item->arg);
2597 }
2598
2599 i = write_message(buf.buf, buf.len, todo_file, 0);
2600 todo_list_release(&todo_list);
2601 return i;
2602}
2603
2604enum check_level {
2605 CHECK_IGNORE = 0, CHECK_WARN, CHECK_ERROR
2606};
2607
2608static enum check_level get_missing_commit_check_level(void)
2609{
2610 const char *value;
2611
2612 if (git_config_get_value("rebase.missingcommitscheck", &value) ||
2613 !strcasecmp("ignore", value))
2614 return CHECK_IGNORE;
2615 if (!strcasecmp("warn", value))
2616 return CHECK_WARN;
2617 if (!strcasecmp("error", value))
2618 return CHECK_ERROR;
2619 warning(_("unrecognized setting %s for option "
2620 "rebase.missingCommitsCheck. Ignoring."), value);
2621 return CHECK_IGNORE;
2622}
2623
2624/*
2625 * Check if the user dropped some commits by mistake
2626 * Behaviour determined by rebase.missingCommitsCheck.
2627 * Check if there is an unrecognized command or a
2628 * bad SHA-1 in a command.
2629 */
2630int check_todo_list(void)
2631{
2632 enum check_level check_level = get_missing_commit_check_level();
2633 struct strbuf todo_file = STRBUF_INIT;
2634 struct todo_list todo_list = TODO_LIST_INIT;
2635 struct strbuf missing = STRBUF_INIT;
2636 int advise_to_edit_todo = 0, res = 0, fd, i;
2637
2638 strbuf_addstr(&todo_file, rebase_path_todo());
2639 fd = open(todo_file.buf, O_RDONLY);
2640 if (fd < 0) {
2641 res = error_errno(_("could not open '%s'"), todo_file.buf);
2642 goto leave_check;
2643 }
2644 if (strbuf_read(&todo_list.buf, fd, 0) < 0) {
2645 close(fd);
2646 res = error(_("could not read '%s'."), todo_file.buf);
2647 goto leave_check;
2648 }
2649 close(fd);
2650 advise_to_edit_todo = res =
2651 parse_insn_buffer(todo_list.buf.buf, &todo_list);
2652
2653 if (res || check_level == CHECK_IGNORE)
2654 goto leave_check;
2655
2656 /* Mark the commits in git-rebase-todo as seen */
2657 for (i = 0; i < todo_list.nr; i++) {
2658 struct commit *commit = todo_list.items[i].commit;
2659 if (commit)
2660 commit->util = (void *)1;
2661 }
2662
2663 todo_list_release(&todo_list);
2664 strbuf_addstr(&todo_file, ".backup");
2665 fd = open(todo_file.buf, O_RDONLY);
2666 if (fd < 0) {
2667 res = error_errno(_("could not open '%s'"), todo_file.buf);
2668 goto leave_check;
2669 }
2670 if (strbuf_read(&todo_list.buf, fd, 0) < 0) {
2671 close(fd);
2672 res = error(_("could not read '%s'."), todo_file.buf);
2673 goto leave_check;
2674 }
2675 close(fd);
2676 strbuf_release(&todo_file);
2677 res = !!parse_insn_buffer(todo_list.buf.buf, &todo_list);
2678
2679 /* Find commits in git-rebase-todo.backup yet unseen */
2680 for (i = todo_list.nr - 1; i >= 0; i--) {
2681 struct todo_item *item = todo_list.items + i;
2682 struct commit *commit = item->commit;
2683 if (commit && !commit->util) {
2684 strbuf_addf(&missing, " - %s %.*s\n",
2685 short_commit_name(commit),
2686 item->arg_len, item->arg);
2687 commit->util = (void *)1;
2688 }
2689 }
2690
2691 /* Warn about missing commits */
2692 if (!missing.len)
2693 goto leave_check;
2694
2695 if (check_level == CHECK_ERROR)
2696 advise_to_edit_todo = res = 1;
2697
2698 fprintf(stderr,
2699 _("Warning: some commits may have been dropped accidentally.\n"
2700 "Dropped commits (newer to older):\n"));
2701
2702 /* Make the list user-friendly and display */
2703 fputs(missing.buf, stderr);
2704 strbuf_release(&missing);
2705
2706 fprintf(stderr, _("To avoid this message, use \"drop\" to "
2707 "explicitly remove a commit.\n\n"
2708 "Use 'git config rebase.missingCommitsCheck' to change "
2709 "the level of warnings.\n"
2710 "The possible behaviours are: ignore, warn, error.\n\n"));
2711
2712leave_check:
2713 strbuf_release(&todo_file);
2714 todo_list_release(&todo_list);
2715
2716 if (advise_to_edit_todo)
2717 fprintf(stderr,
2718 _("You can fix this with 'git rebase --edit-todo' "
2719 "and then run 'git rebase --continue'.\n"
2720 "Or you can abort the rebase with 'git rebase"
2721 " --abort'.\n"));
2722
2723 return res;
2724}
2725
2726static int rewrite_file(const char *path, const char *buf, size_t len)
2727{
2728 int rc = 0;
2729 int fd = open(path, O_WRONLY | O_TRUNC);
2730 if (fd < 0)
2731 return error_errno(_("could not open '%s' for writing"), path);
2732 if (write_in_full(fd, buf, len) < 0)
2733 rc = error_errno(_("could not write to '%s'"), path);
2734 if (close(fd) && !rc)
2735 rc = error_errno(_("could not close '%s'"), path);
2736 return rc;
2737}
2738
2739/* skip picking commits whose parents are unchanged */
2740int skip_unnecessary_picks(void)
2741{
2742 const char *todo_file = rebase_path_todo();
2743 struct strbuf buf = STRBUF_INIT;
2744 struct todo_list todo_list = TODO_LIST_INIT;
2745 struct object_id onto_oid, *oid = &onto_oid, *parent_oid;
2746 int fd, i;
2747
2748 if (!read_oneliner(&buf, rebase_path_onto(), 0))
2749 return error(_("could not read 'onto'"));
2750 if (get_oid(buf.buf, &onto_oid)) {
2751 strbuf_release(&buf);
2752 return error(_("need a HEAD to fixup"));
2753 }
2754 strbuf_release(&buf);
2755
2756 fd = open(todo_file, O_RDONLY);
2757 if (fd < 0) {
2758 return error_errno(_("could not open '%s'"), todo_file);
2759 }
2760 if (strbuf_read(&todo_list.buf, fd, 0) < 0) {
2761 close(fd);
2762 return error(_("could not read '%s'."), todo_file);
2763 }
2764 close(fd);
2765 if (parse_insn_buffer(todo_list.buf.buf, &todo_list) < 0) {
2766 todo_list_release(&todo_list);
2767 return -1;
2768 }
2769
2770 for (i = 0; i < todo_list.nr; i++) {
2771 struct todo_item *item = todo_list.items + i;
2772
2773 if (item->command >= TODO_NOOP)
2774 continue;
2775 if (item->command != TODO_PICK)
2776 break;
2777 if (parse_commit(item->commit)) {
2778 todo_list_release(&todo_list);
2779 return error(_("could not parse commit '%s'"),
2780 oid_to_hex(&item->commit->object.oid));
2781 }
2782 if (!item->commit->parents)
2783 break; /* root commit */
2784 if (item->commit->parents->next)
2785 break; /* merge commit */
2786 parent_oid = &item->commit->parents->item->object.oid;
2787 if (hashcmp(parent_oid->hash, oid->hash))
2788 break;
2789 oid = &item->commit->object.oid;
2790 }
2791 if (i > 0) {
2792 int offset = i < todo_list.nr ?
2793 todo_list.items[i].offset_in_buf : todo_list.buf.len;
2794 const char *done_path = rebase_path_done();
2795
2796 fd = open(done_path, O_CREAT | O_WRONLY | O_APPEND, 0666);
2797 if (fd < 0) {
2798 error_errno(_("could not open '%s' for writing"),
2799 done_path);
2800 todo_list_release(&todo_list);
2801 return -1;
2802 }
2803 if (write_in_full(fd, todo_list.buf.buf, offset) < 0) {
2804 error_errno(_("could not write to '%s'"), done_path);
2805 todo_list_release(&todo_list);
2806 close(fd);
2807 return -1;
2808 }
2809 close(fd);
2810
2811 if (rewrite_file(rebase_path_todo(), todo_list.buf.buf + offset,
2812 todo_list.buf.len - offset) < 0) {
2813 todo_list_release(&todo_list);
2814 return -1;
2815 }
2816
2817 todo_list.current = i;
2818 if (is_fixup(peek_command(&todo_list, 0)))
2819 record_in_rewritten(oid, peek_command(&todo_list, 0));
2820 }
2821
2822 todo_list_release(&todo_list);
2823 printf("%s\n", oid_to_hex(oid));
2824
2825 return 0;
2826}
2827
2828struct subject2item_entry {
2829 struct hashmap_entry entry;
2830 int i;
2831 char subject[FLEX_ARRAY];
2832};
2833
2834static int subject2item_cmp(const void *fndata,
2835 const struct subject2item_entry *a,
2836 const struct subject2item_entry *b, const void *key)
2837{
2838 return key ? strcmp(a->subject, key) : strcmp(a->subject, b->subject);
2839}
2840
2841/*
2842 * Rearrange the todo list that has both "pick commit-id msg" and "pick
2843 * commit-id fixup!/squash! msg" in it so that the latter is put immediately
2844 * after the former, and change "pick" to "fixup"/"squash".
2845 *
2846 * Note that if the config has specified a custom instruction format, each log
2847 * message will have to be retrieved from the commit (as the oneline in the
2848 * script cannot be trusted) in order to normalize the autosquash arrangement.
2849 */
2850int rearrange_squash(void)
2851{
2852 const char *todo_file = rebase_path_todo();
2853 struct todo_list todo_list = TODO_LIST_INIT;
2854 struct hashmap subject2item;
2855 int res = 0, rearranged = 0, *next, *tail, fd, i;
2856 char **subjects;
2857
2858 fd = open(todo_file, O_RDONLY);
2859 if (fd < 0)
2860 return error_errno(_("could not open '%s'"), todo_file);
2861 if (strbuf_read(&todo_list.buf, fd, 0) < 0) {
2862 close(fd);
2863 return error(_("could not read '%s'."), todo_file);
2864 }
2865 close(fd);
2866 if (parse_insn_buffer(todo_list.buf.buf, &todo_list) < 0) {
2867 todo_list_release(&todo_list);
2868 return -1;
2869 }
2870
2871 /*
2872 * The hashmap maps onelines to the respective todo list index.
2873 *
2874 * If any items need to be rearranged, the next[i] value will indicate
2875 * which item was moved directly after the i'th.
2876 *
2877 * In that case, last[i] will indicate the index of the latest item to
2878 * be moved to appear after the i'th.
2879 */
2880 hashmap_init(&subject2item, (hashmap_cmp_fn) subject2item_cmp,
2881 NULL, todo_list.nr);
2882 ALLOC_ARRAY(next, todo_list.nr);
2883 ALLOC_ARRAY(tail, todo_list.nr);
2884 ALLOC_ARRAY(subjects, todo_list.nr);
2885 for (i = 0; i < todo_list.nr; i++) {
2886 struct strbuf buf = STRBUF_INIT;
2887 struct todo_item *item = todo_list.items + i;
2888 const char *commit_buffer, *subject, *p;
2889 size_t subject_len;
2890 int i2 = -1;
2891 struct subject2item_entry *entry;
2892
2893 next[i] = tail[i] = -1;
2894 if (item->command >= TODO_EXEC) {
2895 subjects[i] = NULL;
2896 continue;
2897 }
2898
2899 if (is_fixup(item->command)) {
2900 todo_list_release(&todo_list);
2901 return error(_("the script was already rearranged."));
2902 }
2903
2904 item->commit->util = item;
2905
2906 parse_commit(item->commit);
2907 commit_buffer = get_commit_buffer(item->commit, NULL);
2908 find_commit_subject(commit_buffer, &subject);
2909 format_subject(&buf, subject, " ");
2910 subject = subjects[i] = strbuf_detach(&buf, &subject_len);
2911 unuse_commit_buffer(item->commit, commit_buffer);
2912 if ((skip_prefix(subject, "fixup! ", &p) ||
2913 skip_prefix(subject, "squash! ", &p))) {
2914 struct commit *commit2;
2915
2916 for (;;) {
2917 while (isspace(*p))
2918 p++;
2919 if (!skip_prefix(p, "fixup! ", &p) &&
2920 !skip_prefix(p, "squash! ", &p))
2921 break;
2922 }
2923
2924 if ((entry = hashmap_get_from_hash(&subject2item,
2925 strhash(p), p)))
2926 /* found by title */
2927 i2 = entry->i;
2928 else if (!strchr(p, ' ') &&
2929 (commit2 =
2930 lookup_commit_reference_by_name(p)) &&
2931 commit2->util)
2932 /* found by commit name */
2933 i2 = (struct todo_item *)commit2->util
2934 - todo_list.items;
2935 else {
2936 /* copy can be a prefix of the commit subject */
2937 for (i2 = 0; i2 < i; i2++)
2938 if (subjects[i2] &&
2939 starts_with(subjects[i2], p))
2940 break;
2941 if (i2 == i)
2942 i2 = -1;
2943 }
2944 }
2945 if (i2 >= 0) {
2946 rearranged = 1;
2947 todo_list.items[i].command =
2948 starts_with(subject, "fixup!") ?
2949 TODO_FIXUP : TODO_SQUASH;
2950 if (next[i2] < 0)
2951 next[i2] = i;
2952 else
2953 next[tail[i2]] = i;
2954 tail[i2] = i;
2955 } else if (!hashmap_get_from_hash(&subject2item,
2956 strhash(subject), subject)) {
2957 FLEX_ALLOC_MEM(entry, subject, subject, subject_len);
2958 entry->i = i;
2959 hashmap_entry_init(entry, strhash(entry->subject));
2960 hashmap_put(&subject2item, entry);
2961 }
2962 }
2963
2964 if (rearranged) {
2965 struct strbuf buf = STRBUF_INIT;
2966
2967 for (i = 0; i < todo_list.nr; i++) {
2968 enum todo_command command = todo_list.items[i].command;
2969 int cur = i;
2970
2971 /*
2972 * Initially, all commands are 'pick's. If it is a
2973 * fixup or a squash now, we have rearranged it.
2974 */
2975 if (is_fixup(command))
2976 continue;
2977
2978 while (cur >= 0) {
2979 int offset = todo_list.items[cur].offset_in_buf;
2980 int end_offset = cur + 1 < todo_list.nr ?
2981 todo_list.items[cur + 1].offset_in_buf :
2982 todo_list.buf.len;
2983 char *bol = todo_list.buf.buf + offset;
2984 char *eol = todo_list.buf.buf + end_offset;
2985
2986 /* replace 'pick', by 'fixup' or 'squash' */
2987 command = todo_list.items[cur].command;
2988 if (is_fixup(command)) {
2989 strbuf_addstr(&buf,
2990 todo_command_info[command].str);
2991 bol += strcspn(bol, " \t");
2992 }
2993
2994 strbuf_add(&buf, bol, eol - bol);
2995
2996 cur = next[cur];
2997 }
2998 }
2999
3000 res = rewrite_file(todo_file, buf.buf, buf.len);
3001 strbuf_release(&buf);
3002 }
3003
3004 free(next);
3005 free(tail);
3006 for (i = 0; i < todo_list.nr; i++)
3007 free(subjects[i]);
3008 free(subjects);
3009 hashmap_free(&subject2item, 1);
3010 todo_list_release(&todo_list);
3011
3012 return res;
3013}