1/*
2 * "git rebase" builtin command
3 *
4 * Copyright (c) 2018 Pratik Karki
5 */
6#include "builtin.h"
8#include "run-command.h"
9#include "exec-cmd.h"
10#include "argv-array.h"
11#include "dir.h"
12#include "packfile.h"
13#include "refs.h"
14#include "quote.h"
15#include "config.h"
16#include "cache-tree.h"
17#include "unpack-trees.h"
18#include "lockfile.h"
19#include "parse-options.h"
20#include "commit.h"
21#include "diff.h"
22#include "wt-status.h"
23#include "revision.h"
24#include "rerere.h"
25static char const * const builtin_rebase_usage[] = {
27 N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] "
28 "[<upstream>] [<branch>]"),
29 N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] "
30 "--root [<branch>]"),
31 N_("git rebase --continue | --abort | --skip | --edit-todo"),
32 NULL
33};
34static GIT_PATH_FUNC(apply_dir, "rebase-apply")
36static GIT_PATH_FUNC(merge_dir, "rebase-merge")
37enum rebase_type {
39 REBASE_UNSPECIFIED = -1,
40 REBASE_AM,
41 REBASE_MERGE,
42 REBASE_INTERACTIVE,
43 REBASE_PRESERVE_MERGES
44};
45static int use_builtin_rebase(void)
47{
48 struct child_process cp = CHILD_PROCESS_INIT;
49 struct strbuf out = STRBUF_INIT;
50 int ret;
51 argv_array_pushl(&cp.args,
53 "config", "--bool", "rebase.usebuiltin", NULL);
54 cp.git_cmd = 1;
55 if (capture_command(&cp, &out, 6)) {
56 strbuf_release(&out);
57 return 1;
58 }
59 strbuf_trim(&out);
61 ret = !strcmp("true", out.buf);
62 strbuf_release(&out);
63 return ret;
64}
65struct rebase_options {
67 enum rebase_type type;
68 const char *state_dir;
69 struct commit *upstream;
70 const char *upstream_name;
71 const char *upstream_arg;
72 char *head_name;
73 struct object_id orig_head;
74 struct commit *onto;
75 const char *onto_name;
76 const char *revisions;
77 const char *switch_to;
78 int root;
79 struct object_id *squash_onto;
80 struct commit *restrict_revision;
81 int dont_finish_rebase;
82 enum {
83 REBASE_NO_QUIET = 1<<0,
84 REBASE_VERBOSE = 1<<1,
85 REBASE_DIFFSTAT = 1<<2,
86 REBASE_FORCE = 1<<3,
87 REBASE_INTERACTIVE_EXPLICIT = 1<<4,
88 } flags;
89 struct strbuf git_am_opt;
90 const char *action;
91 int signoff;
92 int allow_rerere_autoupdate;
93 int keep_empty;
94 int autosquash;
95 char *gpg_sign_opt;
96 int autostash;
97 char *cmd;
98 int allow_empty_message;
99 int rebase_merges, rebase_cousins;
100 char *strategy, *strategy_opts;
101 struct strbuf git_format_patch_opt;
102};
103static int is_interactive(struct rebase_options *opts)
105{
106 return opts->type == REBASE_INTERACTIVE ||
107 opts->type == REBASE_PRESERVE_MERGES;
108}
109static void imply_interactive(struct rebase_options *opts, const char *option)
111{
112 switch (opts->type) {
113 case REBASE_AM:
114 die(_("%s requires an interactive rebase"), option);
115 break;
116 case REBASE_INTERACTIVE:
117 case REBASE_PRESERVE_MERGES:
118 break;
119 case REBASE_MERGE:
120 /* we silently *upgrade* --merge to --interactive if needed */
121 default:
122 opts->type = REBASE_INTERACTIVE; /* implied */
123 break;
124 }
125}
126/* Returns the filename prefixed by the state_dir */
128static const char *state_dir_path(const char *filename, struct rebase_options *opts)
129{
130 static struct strbuf path = STRBUF_INIT;
131 static size_t prefix_len;
132 if (!prefix_len) {
134 strbuf_addf(&path, "%s/", opts->state_dir);
135 prefix_len = path.len;
136 }
137 strbuf_setlen(&path, prefix_len);
139 strbuf_addstr(&path, filename);
140 return path.buf;
141}
142/* Read one file, then strip line endings */
144static int read_one(const char *path, struct strbuf *buf)
145{
146 if (strbuf_read_file(buf, path, 0) < 0)
147 return error_errno(_("could not read '%s'"), path);
148 strbuf_trim_trailing_newline(buf);
149 return 0;
150}
151/* Initialize the rebase options from the state directory. */
153static int read_basic_state(struct rebase_options *opts)
154{
155 struct strbuf head_name = STRBUF_INIT;
156 struct strbuf buf = STRBUF_INIT;
157 struct object_id oid;
158 if (read_one(state_dir_path("head-name", opts), &head_name) ||
160 read_one(state_dir_path("onto", opts), &buf))
161 return -1;
162 opts->head_name = starts_with(head_name.buf, "refs/") ?
163 xstrdup(head_name.buf) : NULL;
164 strbuf_release(&head_name);
165 if (get_oid(buf.buf, &oid))
166 return error(_("could not get 'onto': '%s'"), buf.buf);
167 opts->onto = lookup_commit_or_die(&oid, buf.buf);
168 /*
170 * We always write to orig-head, but interactive rebase used to write to
171 * head. Fall back to reading from head to cover for the case that the
172 * user upgraded git with an ongoing interactive rebase.
173 */
174 strbuf_reset(&buf);
175 if (file_exists(state_dir_path("orig-head", opts))) {
176 if (read_one(state_dir_path("orig-head", opts), &buf))
177 return -1;
178 } else if (read_one(state_dir_path("head", opts), &buf))
179 return -1;
180 if (get_oid(buf.buf, &opts->orig_head))
181 return error(_("invalid orig-head: '%s'"), buf.buf);
182 strbuf_reset(&buf);
184 if (read_one(state_dir_path("quiet", opts), &buf))
185 return -1;
186 if (buf.len)
187 opts->flags &= ~REBASE_NO_QUIET;
188 else
189 opts->flags |= REBASE_NO_QUIET;
190 if (file_exists(state_dir_path("verbose", opts)))
192 opts->flags |= REBASE_VERBOSE;
193 if (file_exists(state_dir_path("signoff", opts))) {
195 opts->signoff = 1;
196 opts->flags |= REBASE_FORCE;
197 }
198 if (file_exists(state_dir_path("allow_rerere_autoupdate", opts))) {
200 strbuf_reset(&buf);
201 if (read_one(state_dir_path("allow_rerere_autoupdate", opts),
202 &buf))
203 return -1;
204 if (!strcmp(buf.buf, "--rerere-autoupdate"))
205 opts->allow_rerere_autoupdate = 1;
206 else if (!strcmp(buf.buf, "--no-rerere-autoupdate"))
207 opts->allow_rerere_autoupdate = 0;
208 else
209 warning(_("ignoring invalid allow_rerere_autoupdate: "
210 "'%s'"), buf.buf);
211 } else
212 opts->allow_rerere_autoupdate = -1;
213 if (file_exists(state_dir_path("gpg_sign_opt", opts))) {
215 strbuf_reset(&buf);
216 if (read_one(state_dir_path("gpg_sign_opt", opts),
217 &buf))
218 return -1;
219 free(opts->gpg_sign_opt);
220 opts->gpg_sign_opt = xstrdup(buf.buf);
221 }
222 if (file_exists(state_dir_path("strategy", opts))) {
224 strbuf_reset(&buf);
225 if (read_one(state_dir_path("strategy", opts), &buf))
226 return -1;
227 free(opts->strategy);
228 opts->strategy = xstrdup(buf.buf);
229 }
230 if (file_exists(state_dir_path("strategy_opts", opts))) {
232 strbuf_reset(&buf);
233 if (read_one(state_dir_path("strategy_opts", opts), &buf))
234 return -1;
235 free(opts->strategy_opts);
236 opts->strategy_opts = xstrdup(buf.buf);
237 }
238 strbuf_release(&buf);
240 return 0;
242}
243static int apply_autostash(struct rebase_options *opts)
245{
246 const char *path = state_dir_path("autostash", opts);
247 struct strbuf autostash = STRBUF_INIT;
248 struct child_process stash_apply = CHILD_PROCESS_INIT;
249 if (!file_exists(path))
251 return 0;
252 if (read_one(path, &autostash))
254 return error(_("Could not read '%s'"), path);
255 argv_array_pushl(&stash_apply.args,
256 "stash", "apply", autostash.buf, NULL);
257 stash_apply.git_cmd = 1;
258 stash_apply.no_stderr = stash_apply.no_stdout =
259 stash_apply.no_stdin = 1;
260 if (!run_command(&stash_apply))
261 printf(_("Applied autostash.\n"));
262 else {
263 struct argv_array args = ARGV_ARRAY_INIT;
264 int res = 0;
265 argv_array_pushl(&args,
267 "stash", "store", "-m", "autostash", "-q",
268 autostash.buf, NULL);
269 if (run_command_v_opt(args.argv, RUN_GIT_CMD))
270 res = error(_("Cannot store %s"), autostash.buf);
271 argv_array_clear(&args);
272 strbuf_release(&autostash);
273 if (res)
274 return res;
275 fprintf(stderr,
277 _("Applying autostash resulted in conflicts.\n"
278 "Your changes are safe in the stash.\n"
279 "You can run \"git stash pop\" or \"git stash drop\" "
280 "at any time.\n"));
281 }
282 strbuf_release(&autostash);
284 return 0;
285}
286static int finish_rebase(struct rebase_options *opts)
288{
289 struct strbuf dir = STRBUF_INIT;
290 const char *argv_gc_auto[] = { "gc", "--auto", NULL };
291 delete_ref(NULL, "REBASE_HEAD", NULL, REF_NO_DEREF);
293 apply_autostash(opts);
294 close_all_packs(the_repository->objects);
295 /*
296 * We ignore errors in 'gc --auto', since the
297 * user should see them.
298 */
299 run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
300 strbuf_addstr(&dir, opts->state_dir);
301 remove_dir_recursively(&dir, 0);
302 strbuf_release(&dir);
303 return 0;
305}
306static struct commit *peel_committish(const char *name)
308{
309 struct object *obj;
310 struct object_id oid;
311 if (get_oid(name, &oid))
313 return NULL;
314 obj = parse_object(the_repository, &oid);
315 return (struct commit *)peel_to_type(name, 0, obj, OBJ_COMMIT);
316}
317static void add_var(struct strbuf *buf, const char *name, const char *value)
319{
320 if (!value)
321 strbuf_addf(buf, "unset %s; ", name);
322 else {
323 strbuf_addf(buf, "%s=", name);
324 sq_quote_buf(buf, value);
325 strbuf_addstr(buf, "; ");
326 }
327}
328static const char *resolvemsg =
330N_("Resolve all conflicts manually, mark them as resolved with\n"
331"\"git add/rm <conflicted_files>\", then run \"git rebase --continue\".\n"
332"You can instead skip this commit: run \"git rebase --skip\".\n"
333"To abort and get back to the state before \"git rebase\", run "
334"\"git rebase --abort\".");
335static int run_specific_rebase(struct rebase_options *opts)
337{
338 const char *argv[] = { NULL, NULL };
339 struct strbuf script_snippet = STRBUF_INIT;
340 int status;
341 const char *backend, *backend_func;
342 if (opts->type == REBASE_INTERACTIVE) {
344 /* Run builtin interactive rebase */
345 struct child_process child = CHILD_PROCESS_INIT;
346 argv_array_pushf(&child.env_array, "GIT_CHERRY_PICK_HELP=%s",
348 resolvemsg);
349 if (!(opts->flags & REBASE_INTERACTIVE_EXPLICIT)) {
350 argv_array_push(&child.env_array, "GIT_EDITOR=:");
351 opts->autosquash = 0;
352 }
353 child.git_cmd = 1;
355 argv_array_push(&child.args, "rebase--interactive");
356 if (opts->action)
358 argv_array_pushf(&child.args, "--%s", opts->action);
359 if (opts->keep_empty)
360 argv_array_push(&child.args, "--keep-empty");
361 if (opts->rebase_merges)
362 argv_array_push(&child.args, "--rebase-merges");
363 if (opts->rebase_cousins)
364 argv_array_push(&child.args, "--rebase-cousins");
365 if (opts->autosquash)
366 argv_array_push(&child.args, "--autosquash");
367 if (opts->flags & REBASE_VERBOSE)
368 argv_array_push(&child.args, "--verbose");
369 if (opts->flags & REBASE_FORCE)
370 argv_array_push(&child.args, "--no-ff");
371 if (opts->restrict_revision)
372 argv_array_pushf(&child.args,
373 "--restrict-revision=^%s",
374 oid_to_hex(&opts->restrict_revision->object.oid));
375 if (opts->upstream)
376 argv_array_pushf(&child.args, "--upstream=%s",
377 oid_to_hex(&opts->upstream->object.oid));
378 if (opts->onto)
379 argv_array_pushf(&child.args, "--onto=%s",
380 oid_to_hex(&opts->onto->object.oid));
381 if (opts->squash_onto)
382 argv_array_pushf(&child.args, "--squash-onto=%s",
383 oid_to_hex(opts->squash_onto));
384 if (opts->onto_name)
385 argv_array_pushf(&child.args, "--onto-name=%s",
386 opts->onto_name);
387 argv_array_pushf(&child.args, "--head-name=%s",
388 opts->head_name ?
389 opts->head_name : "detached HEAD");
390 if (opts->strategy)
391 argv_array_pushf(&child.args, "--strategy=%s",
392 opts->strategy);
393 if (opts->strategy_opts)
394 argv_array_pushf(&child.args, "--strategy-opts=%s",
395 opts->strategy_opts);
396 if (opts->switch_to)
397 argv_array_pushf(&child.args, "--switch-to=%s",
398 opts->switch_to);
399 if (opts->cmd)
400 argv_array_pushf(&child.args, "--cmd=%s", opts->cmd);
401 if (opts->allow_empty_message)
402 argv_array_push(&child.args, "--allow-empty-message");
403 if (opts->allow_rerere_autoupdate > 0)
404 argv_array_push(&child.args, "--rerere-autoupdate");
405 else if (opts->allow_rerere_autoupdate == 0)
406 argv_array_push(&child.args, "--no-rerere-autoupdate");
407 if (opts->gpg_sign_opt)
408 argv_array_push(&child.args, opts->gpg_sign_opt);
409 if (opts->signoff)
410 argv_array_push(&child.args, "--signoff");
411 status = run_command(&child);
413 goto finished_rebase;
414 }
415 add_var(&script_snippet, "GIT_DIR", absolute_path(get_git_dir()));
417 add_var(&script_snippet, "state_dir", opts->state_dir);
418 add_var(&script_snippet, "upstream_name", opts->upstream_name);
420 add_var(&script_snippet, "upstream", opts->upstream ?
421 oid_to_hex(&opts->upstream->object.oid) : NULL);
422 add_var(&script_snippet, "head_name",
423 opts->head_name ? opts->head_name : "detached HEAD");
424 add_var(&script_snippet, "orig_head", oid_to_hex(&opts->orig_head));
425 add_var(&script_snippet, "onto", opts->onto ?
426 oid_to_hex(&opts->onto->object.oid) : NULL);
427 add_var(&script_snippet, "onto_name", opts->onto_name);
428 add_var(&script_snippet, "revisions", opts->revisions);
429 add_var(&script_snippet, "restrict_revision", opts->restrict_revision ?
430 oid_to_hex(&opts->restrict_revision->object.oid) : NULL);
431 add_var(&script_snippet, "GIT_QUIET",
432 opts->flags & REBASE_NO_QUIET ? "" : "t");
433 add_var(&script_snippet, "git_am_opt", opts->git_am_opt.buf);
434 add_var(&script_snippet, "verbose",
435 opts->flags & REBASE_VERBOSE ? "t" : "");
436 add_var(&script_snippet, "diffstat",
437 opts->flags & REBASE_DIFFSTAT ? "t" : "");
438 add_var(&script_snippet, "force_rebase",
439 opts->flags & REBASE_FORCE ? "t" : "");
440 if (opts->switch_to)
441 add_var(&script_snippet, "switch_to", opts->switch_to);
442 add_var(&script_snippet, "action", opts->action ? opts->action : "");
443 add_var(&script_snippet, "signoff", opts->signoff ? "--signoff" : "");
444 add_var(&script_snippet, "allow_rerere_autoupdate",
445 opts->allow_rerere_autoupdate < 0 ? "" :
446 opts->allow_rerere_autoupdate ?
447 "--rerere-autoupdate" : "--no-rerere-autoupdate");
448 add_var(&script_snippet, "keep_empty", opts->keep_empty ? "yes" : "");
449 add_var(&script_snippet, "autosquash", opts->autosquash ? "t" : "");
450 add_var(&script_snippet, "gpg_sign_opt", opts->gpg_sign_opt);
451 add_var(&script_snippet, "cmd", opts->cmd);
452 add_var(&script_snippet, "allow_empty_message",
453 opts->allow_empty_message ? "--allow-empty-message" : "");
454 add_var(&script_snippet, "rebase_merges",
455 opts->rebase_merges ? "t" : "");
456 add_var(&script_snippet, "rebase_cousins",
457 opts->rebase_cousins ? "t" : "");
458 add_var(&script_snippet, "strategy", opts->strategy);
459 add_var(&script_snippet, "strategy_opts", opts->strategy_opts);
460 add_var(&script_snippet, "rebase_root", opts->root ? "t" : "");
461 add_var(&script_snippet, "squash_onto",
462 opts->squash_onto ? oid_to_hex(opts->squash_onto) : "");
463 add_var(&script_snippet, "git_format_patch_opt",
464 opts->git_format_patch_opt.buf);
465 if (is_interactive(opts) &&
467 !(opts->flags & REBASE_INTERACTIVE_EXPLICIT)) {
468 strbuf_addstr(&script_snippet,
469 "GIT_EDITOR=:; export GIT_EDITOR; ");
470 opts->autosquash = 0;
471 }
472 switch (opts->type) {
474 case REBASE_AM:
475 backend = "git-rebase--am";
476 backend_func = "git_rebase__am";
477 break;
478 case REBASE_MERGE:
479 backend = "git-rebase--merge";
480 backend_func = "git_rebase__merge";
481 break;
482 case REBASE_PRESERVE_MERGES:
483 backend = "git-rebase--preserve-merges";
484 backend_func = "git_rebase__preserve_merges";
485 break;
486 default:
487 BUG("Unhandled rebase type %d", opts->type);
488 break;
489 }
490 strbuf_addf(&script_snippet,
492 ". git-sh-setup && . git-rebase--common &&"
493 " . %s && %s", backend, backend_func);
494 argv[0] = script_snippet.buf;
495 status = run_command_v_opt(argv, RUN_USING_SHELL);
497finished_rebase:
498 if (opts->dont_finish_rebase)
499 ; /* do nothing */
500 else if (opts->type == REBASE_INTERACTIVE)
501 ; /* interactive rebase cleans up after itself */
502 else if (status == 0) {
503 if (!file_exists(state_dir_path("stopped-sha", opts)))
504 finish_rebase(opts);
505 } else if (status == 2) {
506 struct strbuf dir = STRBUF_INIT;
507 apply_autostash(opts);
509 strbuf_addstr(&dir, opts->state_dir);
510 remove_dir_recursively(&dir, 0);
511 strbuf_release(&dir);
512 die("Nothing to do");
513 }
514 strbuf_release(&script_snippet);
516 return status ? -1 : 0;
518}
519#define GIT_REFLOG_ACTION_ENVIRONMENT "GIT_REFLOG_ACTION"
521static int reset_head(struct object_id *oid, const char *action,
523 const char *switch_to_branch, int detach_head,
524 const char *reflog_orig_head, const char *reflog_head)
525{
526 struct object_id head_oid;
527 struct tree_desc desc;
528 struct lock_file lock = LOCK_INIT;
529 struct unpack_trees_options unpack_tree_opts;
530 struct tree *tree;
531 const char *reflog_action;
532 struct strbuf msg = STRBUF_INIT;
533 size_t prefix_len;
534 struct object_id *orig = NULL, oid_orig,
535 *old_orig = NULL, oid_old_orig;
536 int ret = 0;
537 if (switch_to_branch && !starts_with(switch_to_branch, "refs/"))
539 BUG("Not a fully qualified branch: '%s'", switch_to_branch);
540 if (hold_locked_index(&lock, LOCK_REPORT_ON_ERROR) < 0)
542 return -1;
543 if (!oid) {
545 if (get_oid("HEAD", &head_oid)) {
546 rollback_lock_file(&lock);
547 return error(_("could not determine HEAD revision"));
548 }
549 oid = &head_oid;
550 }
551 memset(&unpack_tree_opts, 0, sizeof(unpack_tree_opts));
553 setup_unpack_trees_porcelain(&unpack_tree_opts, action);
554 unpack_tree_opts.head_idx = 1;
555 unpack_tree_opts.src_index = the_repository->index;
556 unpack_tree_opts.dst_index = the_repository->index;
557 unpack_tree_opts.fn = oneway_merge;
558 unpack_tree_opts.update = 1;
559 unpack_tree_opts.merge = 1;
560 if (!detach_head)
561 unpack_tree_opts.reset = 1;
562 if (read_index_unmerged(the_repository->index) < 0) {
564 rollback_lock_file(&lock);
565 return error(_("could not read index"));
566 }
567 if (!fill_tree_descriptor(&desc, oid)) {
569 error(_("failed to find tree of %s"), oid_to_hex(oid));
570 rollback_lock_file(&lock);
571 free((void *)desc.buffer);
572 return -1;
573 }
574 if (unpack_trees(1, &desc, &unpack_tree_opts)) {
576 rollback_lock_file(&lock);
577 free((void *)desc.buffer);
578 return -1;
579 }
580 tree = parse_tree_indirect(oid);
582 prime_cache_tree(the_repository->index, tree);
583 if (write_locked_index(the_repository->index, &lock, COMMIT_LOCK) < 0)
585 ret = error(_("could not write index"));
586 free((void *)desc.buffer);
587 if (ret)
589 return ret;
590 reflog_action = getenv(GIT_REFLOG_ACTION_ENVIRONMENT);
592 strbuf_addf(&msg, "%s: ", reflog_action ? reflog_action : "rebase");
593 prefix_len = msg.len;
594 if (!get_oid("ORIG_HEAD", &oid_old_orig))
596 old_orig = &oid_old_orig;
597 if (!get_oid("HEAD", &oid_orig)) {
598 orig = &oid_orig;
599 if (!reflog_orig_head) {
600 strbuf_addstr(&msg, "updating ORIG_HEAD");
601 reflog_orig_head = msg.buf;
602 }
603 update_ref(reflog_orig_head, "ORIG_HEAD", orig, old_orig, 0,
604 UPDATE_REFS_MSG_ON_ERR);
605 } else if (old_orig)
606 delete_ref(NULL, "ORIG_HEAD", old_orig, 0);
607 if (!reflog_head) {
608 strbuf_setlen(&msg, prefix_len);
609 strbuf_addstr(&msg, "updating HEAD");
610 reflog_head = msg.buf;
611 }
612 if (!switch_to_branch)
613 ret = update_ref(reflog_head, "HEAD", oid, orig, REF_NO_DEREF,
614 UPDATE_REFS_MSG_ON_ERR);
615 else {
616 ret = create_symref("HEAD", switch_to_branch, msg.buf);
617 if (!ret)
618 ret = update_ref(reflog_head, "HEAD", oid, NULL, 0,
619 UPDATE_REFS_MSG_ON_ERR);
620 }
621 strbuf_release(&msg);
623 return ret;
624}
625static int rebase_config(const char *var, const char *value, void *data)
627{
628 struct rebase_options *opts = data;
629 if (!strcmp(var, "rebase.stat")) {
631 if (git_config_bool(var, value))
632 opts->flags |= REBASE_DIFFSTAT;
633 else
634 opts->flags &= !REBASE_DIFFSTAT;
635 return 0;
636 }
637 if (!strcmp(var, "rebase.autosquash")) {
639 opts->autosquash = git_config_bool(var, value);
640 return 0;
641 }
642 if (!strcmp(var, "commit.gpgsign")) {
644 free(opts->gpg_sign_opt);
645 opts->gpg_sign_opt = git_config_bool(var, value) ?
646 xstrdup("-S") : NULL;
647 return 0;
648 }
649 if (!strcmp(var, "rebase.autostash")) {
651 opts->autostash = git_config_bool(var, value);
652 return 0;
653 }
654 return git_default_config(var, value, data);
656}
657/*
659 * Determines whether the commits in from..to are linear, i.e. contain
660 * no merge commits. This function *expects* `from` to be an ancestor of
661 * `to`.
662 */
663static int is_linear_history(struct commit *from, struct commit *to)
664{
665 while (to && to != from) {
666 parse_commit(to);
667 if (!to->parents)
668 return 1;
669 if (to->parents->next)
670 return 0;
671 to = to->parents->item;
672 }
673 return 1;
674}
675static int can_fast_forward(struct commit *onto, struct object_id *head_oid,
677 struct object_id *merge_base)
678{
679 struct commit *head = lookup_commit(the_repository, head_oid);
680 struct commit_list *merge_bases;
681 int res;
682 if (!head)
684 return 0;
685 merge_bases = get_merge_bases(onto, head);
687 if (merge_bases && !merge_bases->next) {
688 oidcpy(merge_base, &merge_bases->item->object.oid);
689 res = !oidcmp(merge_base, &onto->object.oid);
690 } else {
691 oidcpy(merge_base, &null_oid);
692 res = 0;
693 }
694 free_commit_list(merge_bases);
695 return res && is_linear_history(onto, head);
696}
697/* -i followed by -m is still -i */
699static int parse_opt_merge(const struct option *opt, const char *arg, int unset)
700{
701 struct rebase_options *opts = opt->value;
702 if (!is_interactive(opts))
704 opts->type = REBASE_MERGE;
705 return 0;
707}
708/* -i followed by -p is still explicitly interactive, but -p alone is not */
710static int parse_opt_interactive(const struct option *opt, const char *arg,
711 int unset)
712{
713 struct rebase_options *opts = opt->value;
714 opts->type = REBASE_INTERACTIVE;
716 opts->flags |= REBASE_INTERACTIVE_EXPLICIT;
717 return 0;
719}
720static void NORETURN error_on_missing_default_upstream(void)
722{
723 struct branch *current_branch = branch_get(NULL);
724 printf(_("%s\n"
726 "Please specify which branch you want to rebase against.\n"
727 "See git-rebase(1) for details.\n"
728 "\n"
729 " git rebase '<branch>'\n"
730 "\n"),
731 current_branch ? _("There is no tracking information for "
732 "the current branch.") :
733 _("You are not currently on a branch."));
734 if (current_branch) {
736 const char *remote = current_branch->remote_name;
737 if (!remote)
739 remote = _("<remote>");
740 printf(_("If you wish to set tracking information for this "
742 "branch you can do so with:\n"
743 "\n"
744 " git branch --set-upstream-to=%s/<branch> %s\n"
745 "\n"),
746 remote, current_branch->name);
747 }
748 exit(1);
749}
750int cmd_rebase(int argc, const char **argv, const char *prefix)
752{
753 struct rebase_options options = {
754 .type = REBASE_UNSPECIFIED,
755 .flags = REBASE_NO_QUIET,
756 .git_am_opt = STRBUF_INIT,
757 .allow_rerere_autoupdate = -1,
758 .allow_empty_message = 1,
759 .git_format_patch_opt = STRBUF_INIT,
760 };
761 const char *branch_name;
762 int ret, flags, total_argc, in_progress = 0;
763 int ok_to_skip_pre_rebase = 0;
764 struct strbuf msg = STRBUF_INIT;
765 struct strbuf revisions = STRBUF_INIT;
766 struct strbuf buf = STRBUF_INIT;
767 struct object_id merge_base;
768 enum {
769 NO_ACTION,
770 ACTION_CONTINUE,
771 ACTION_SKIP,
772 ACTION_ABORT,
773 ACTION_QUIT,
774 ACTION_EDIT_TODO,
775 ACTION_SHOW_CURRENT_PATCH,
776 } action = NO_ACTION;
777 int committer_date_is_author_date = 0;
778 int ignore_date = 0;
779 int ignore_whitespace = 0;
780 const char *gpg_sign = NULL;
781 int opt_c = -1;
782 struct string_list whitespace = STRING_LIST_INIT_NODUP;
783 struct string_list exec = STRING_LIST_INIT_NODUP;
784 const char *rebase_merges = NULL;
785 int fork_point = -1;
786 struct string_list strategy_options = STRING_LIST_INIT_NODUP;
787 struct object_id squash_onto;
788 char *squash_onto_name = NULL;
789 struct option builtin_rebase_options[] = {
790 OPT_STRING(0, "onto", &options.onto_name,
791 N_("revision"),
792 N_("rebase onto given branch instead of upstream")),
793 OPT_BOOL(0, "no-verify", &ok_to_skip_pre_rebase,
794 N_("allow pre-rebase hook to run")),
795 OPT_NEGBIT('q', "quiet", &options.flags,
796 N_("be quiet. implies --no-stat"),
797 REBASE_NO_QUIET| REBASE_VERBOSE | REBASE_DIFFSTAT),
798 OPT_BIT('v', "verbose", &options.flags,
799 N_("display a diffstat of what changed upstream"),
800 REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT),
801 {OPTION_NEGBIT, 'n', "no-stat", &options.flags, NULL,
802 N_("do not show diffstat of what changed upstream"),
803 PARSE_OPT_NOARG, NULL, REBASE_DIFFSTAT },
804 OPT_BOOL(0, "ignore-whitespace", &ignore_whitespace,
805 N_("passed to 'git apply'")),
806 OPT_BOOL(0, "signoff", &options.signoff,
807 N_("add a Signed-off-by: line to each commit")),
808 OPT_BOOL(0, "committer-date-is-author-date",
809 &committer_date_is_author_date,
810 N_("passed to 'git am'")),
811 OPT_BOOL(0, "ignore-date", &ignore_date,
812 N_("passed to 'git am'")),
813 OPT_BIT('f', "force-rebase", &options.flags,
814 N_("cherry-pick all commits, even if unchanged"),
815 REBASE_FORCE),
816 OPT_BIT(0, "no-ff", &options.flags,
817 N_("cherry-pick all commits, even if unchanged"),
818 REBASE_FORCE),
819 OPT_CMDMODE(0, "continue", &action, N_("continue"),
820 ACTION_CONTINUE),
821 OPT_CMDMODE(0, "skip", &action,
822 N_("skip current patch and continue"), ACTION_SKIP),
823 OPT_CMDMODE(0, "abort", &action,
824 N_("abort and check out the original branch"),
825 ACTION_ABORT),
826 OPT_CMDMODE(0, "quit", &action,
827 N_("abort but keep HEAD where it is"), ACTION_QUIT),
828 OPT_CMDMODE(0, "edit-todo", &action, N_("edit the todo list "
829 "during an interactive rebase"), ACTION_EDIT_TODO),
830 OPT_CMDMODE(0, "show-current-patch", &action,
831 N_("show the patch file being applied or merged"),
832 ACTION_SHOW_CURRENT_PATCH),
833 { OPTION_CALLBACK, 'm', "merge", &options, NULL,
834 N_("use merging strategies to rebase"),
835 PARSE_OPT_NOARG | PARSE_OPT_NONEG,
836 parse_opt_merge },
837 { OPTION_CALLBACK, 'i', "interactive", &options, NULL,
838 N_("let the user edit the list of commits to rebase"),
839 PARSE_OPT_NOARG | PARSE_OPT_NONEG,
840 parse_opt_interactive },
841 OPT_SET_INT('p', "preserve-merges", &options.type,
842 N_("try to recreate merges instead of ignoring "
843 "them"), REBASE_PRESERVE_MERGES),
844 OPT_BOOL(0, "rerere-autoupdate",
845 &options.allow_rerere_autoupdate,
846 N_("allow rerere to update index with resolved "
847 "conflict")),
848 OPT_BOOL('k', "keep-empty", &options.keep_empty,
849 N_("preserve empty commits during rebase")),
850 OPT_BOOL(0, "autosquash", &options.autosquash,
851 N_("move commits that begin with "
852 "squash!/fixup! under -i")),
853 { OPTION_STRING, 'S', "gpg-sign", &gpg_sign, N_("key-id"),
854 N_("GPG-sign commits"),
855 PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
856 OPT_STRING_LIST(0, "whitespace", &whitespace,
857 N_("whitespace"), N_("passed to 'git apply'")),
858 OPT_SET_INT('C', NULL, &opt_c, N_("passed to 'git apply'"),
859 REBASE_AM),
860 OPT_BOOL(0, "autostash", &options.autostash,
861 N_("automatically stash/stash pop before and after")),
862 OPT_STRING_LIST('x', "exec", &exec, N_("exec"),
863 N_("add exec lines after each commit of the "
864 "editable list")),
865 OPT_BOOL(0, "allow-empty-message",
866 &options.allow_empty_message,
867 N_("allow rebasing commits with empty messages")),
868 {OPTION_STRING, 'r', "rebase-merges", &rebase_merges,
869 N_("mode"),
870 N_("try to rebase merges instead of skipping them"),
871 PARSE_OPT_OPTARG, NULL, (intptr_t)""},
872 OPT_BOOL(0, "fork-point", &fork_point,
873 N_("use 'merge-base --fork-point' to refine upstream")),
874 OPT_STRING('s', "strategy", &options.strategy,
875 N_("strategy"), N_("use the given merge strategy")),
876 OPT_STRING_LIST('X', "strategy-option", &strategy_options,
877 N_("option"),
878 N_("pass the argument through to the merge "
879 "strategy")),
880 OPT_BOOL(0, "root", &options.root,
881 N_("rebase all reachable commits up to the root(s)")),
882 OPT_END(),
883 };
884 /*
886 * NEEDSWORK: Once the builtin rebase has been tested enough
887 * and git-legacy-rebase.sh is retired to contrib/, this preamble
888 * can be removed.
889 */
890 if (!use_builtin_rebase()) {
892 const char *path = mkpath("%s/git-legacy-rebase",
893 git_exec_path());
894 if (sane_execvp(path, (char **)argv) < 0)
896 die_errno(_("could not exec %s"), path);
897 else
898 BUG("sane_execvp() returned???");
899 }
900 if (argc == 2 && !strcmp(argv[1], "-h"))
902 usage_with_options(builtin_rebase_usage,
903 builtin_rebase_options);
904 prefix = setup_git_directory();
906 trace_repo_setup(prefix);
907 setup_work_tree();
908 git_config(rebase_config, &options);
910 strbuf_reset(&buf);
912 strbuf_addf(&buf, "%s/applying", apply_dir());
913 if(file_exists(buf.buf))
914 die(_("It looks like 'git am' is in progress. Cannot rebase."));
915 if (is_directory(apply_dir())) {
917 options.type = REBASE_AM;
918 options.state_dir = apply_dir();
919 } else if (is_directory(merge_dir())) {
920 strbuf_reset(&buf);
921 strbuf_addf(&buf, "%s/rewritten", merge_dir());
922 if (is_directory(buf.buf)) {
923 options.type = REBASE_PRESERVE_MERGES;
924 options.flags |= REBASE_INTERACTIVE_EXPLICIT;
925 } else {
926 strbuf_reset(&buf);
927 strbuf_addf(&buf, "%s/interactive", merge_dir());
928 if(file_exists(buf.buf)) {
929 options.type = REBASE_INTERACTIVE;
930 options.flags |= REBASE_INTERACTIVE_EXPLICIT;
931 } else
932 options.type = REBASE_MERGE;
933 }
934 options.state_dir = merge_dir();
935 }
936 if (options.type != REBASE_UNSPECIFIED)
938 in_progress = 1;
939 total_argc = argc;
941 argc = parse_options(argc, argv, prefix,
942 builtin_rebase_options,
943 builtin_rebase_usage, 0);
944 if (action != NO_ACTION && total_argc != 2) {
946 usage_with_options(builtin_rebase_usage,
947 builtin_rebase_options);
948 }
949 if (argc > 2)
951 usage_with_options(builtin_rebase_usage,
952 builtin_rebase_options);
953 if (action != NO_ACTION && !in_progress)
955 die(_("No rebase in progress?"));
956 if (action == ACTION_EDIT_TODO && !is_interactive(&options))
958 die(_("The --edit-todo action can only be used during "
959 "interactive rebase."));
960 switch (action) {
962 case ACTION_CONTINUE: {
963 struct object_id head;
964 struct lock_file lock_file = LOCK_INIT;
965 int fd;
966 options.action = "continue";
968 /* Sanity check */
970 if (get_oid("HEAD", &head))
971 die(_("Cannot read HEAD"));
972 fd = hold_locked_index(&lock_file, 0);
974 if (read_index(the_repository->index) < 0)
975 die(_("could not read index"));
976 refresh_index(the_repository->index, REFRESH_QUIET, NULL, NULL,
977 NULL);
978 if (0 <= fd)
979 update_index_if_able(the_repository->index,
980 &lock_file);
981 rollback_lock_file(&lock_file);
982 if (has_unstaged_changes(1)) {
984 puts(_("You must edit all merge conflicts and then\n"
985 "mark them as resolved using git add"));
986 exit(1);
987 }
988 if (read_basic_state(&options))
989 exit(1);
990 goto run_rebase;
991 }
992 case ACTION_SKIP: {
993 struct string_list merge_rr = STRING_LIST_INIT_DUP;
994 options.action = "skip";
996 rerere_clear(&merge_rr);
998 string_list_clear(&merge_rr, 1);
999 if (reset_head(NULL, "reset", NULL, 0, NULL, NULL) < 0)
1001 die(_("could not discard worktree changes"));
1002 if (read_basic_state(&options))
1003 exit(1);
1004 goto run_rebase;
1005 }
1006 case ACTION_ABORT: {
1007 struct string_list merge_rr = STRING_LIST_INIT_DUP;
1008 options.action = "abort";
1009 rerere_clear(&merge_rr);
1011 string_list_clear(&merge_rr, 1);
1012 if (read_basic_state(&options))
1014 exit(1);
1015 if (reset_head(&options.orig_head, "reset",
1016 options.head_name, 0, NULL, NULL) < 0)
1017 die(_("could not move back to %s"),
1018 oid_to_hex(&options.orig_head));
1019 ret = finish_rebase(&options);
1020 goto cleanup;
1021 }
1022 case ACTION_QUIT: {
1023 strbuf_reset(&buf);
1024 strbuf_addstr(&buf, options.state_dir);
1025 ret = !!remove_dir_recursively(&buf, 0);
1026 if (ret)
1027 die(_("could not remove '%s'"), options.state_dir);
1028 goto cleanup;
1029 }
1030 case ACTION_EDIT_TODO:
1031 options.action = "edit-todo";
1032 options.dont_finish_rebase = 1;
1033 goto run_rebase;
1034 case ACTION_SHOW_CURRENT_PATCH:
1035 options.action = "show-current-patch";
1036 options.dont_finish_rebase = 1;
1037 goto run_rebase;
1038 case NO_ACTION:
1039 break;
1040 default:
1041 BUG("action: %d", action);
1042 }
1043 /* Make sure no rebase is in progress */
1045 if (in_progress) {
1046 const char *last_slash = strrchr(options.state_dir, '/');
1047 const char *state_dir_base =
1048 last_slash ? last_slash + 1 : options.state_dir;
1049 const char *cmd_live_rebase =
1050 "git rebase (--continue | --abort | --skip)";
1051 strbuf_reset(&buf);
1052 strbuf_addf(&buf, "rm -fr \"%s\"", options.state_dir);
1053 die(_("It seems that there is already a %s directory, and\n"
1054 "I wonder if you are in the middle of another rebase. "
1055 "If that is the\n"
1056 "case, please try\n\t%s\n"
1057 "If that is not the case, please\n\t%s\n"
1058 "and run me again. I am stopping in case you still "
1059 "have something\n"
1060 "valuable there.\n"),
1061 state_dir_base, cmd_live_rebase, buf.buf);
1062 }
1063 if (!(options.flags & REBASE_NO_QUIET))
1065 strbuf_addstr(&options.git_am_opt, " -q");
1066 if (committer_date_is_author_date) {
1068 strbuf_addstr(&options.git_am_opt,
1069 " --committer-date-is-author-date");
1070 options.flags |= REBASE_FORCE;
1071 }
1072 if (ignore_whitespace)
1074 strbuf_addstr(&options.git_am_opt, " --ignore-whitespace");
1075 if (ignore_date) {
1077 strbuf_addstr(&options.git_am_opt, " --ignore-date");
1078 options.flags |= REBASE_FORCE;
1079 }
1080 if (options.keep_empty)
1082 imply_interactive(&options, "--keep-empty");
1083 if (gpg_sign) {
1085 free(options.gpg_sign_opt);
1086 options.gpg_sign_opt = xstrfmt("-S%s", gpg_sign);
1087 }
1088 if (opt_c >= 0)
1090 strbuf_addf(&options.git_am_opt, " -C%d", opt_c);
1091 if (whitespace.nr) {
1093 int i;
1094 for (i = 0; i < whitespace.nr; i++) {
1096 const char *item = whitespace.items[i].string;
1097 strbuf_addf(&options.git_am_opt, " --whitespace=%s",
1099 item);
1100 if ((!strcmp(item, "fix")) || (!strcmp(item, "strip")))
1102 options.flags |= REBASE_FORCE;
1103 }
1104 }
1105 if (exec.nr) {
1107 int i;
1108 imply_interactive(&options, "--exec");
1110 strbuf_reset(&buf);
1112 for (i = 0; i < exec.nr; i++)
1113 strbuf_addf(&buf, "exec %s\n", exec.items[i].string);
1114 options.cmd = xstrdup(buf.buf);
1115 }
1116 if (rebase_merges) {
1118 if (!*rebase_merges)
1119 ; /* default mode; do nothing */
1120 else if (!strcmp("rebase-cousins", rebase_merges))
1121 options.rebase_cousins = 1;
1122 else if (strcmp("no-rebase-cousins", rebase_merges))
1123 die(_("Unknown mode: %s"), rebase_merges);
1124 options.rebase_merges = 1;
1125 imply_interactive(&options, "--rebase-merges");
1126 }
1127 if (strategy_options.nr) {
1129 int i;
1130 if (!options.strategy)
1132 options.strategy = "recursive";
1133 strbuf_reset(&buf);
1135 for (i = 0; i < strategy_options.nr; i++)
1136 strbuf_addf(&buf, " --%s",
1137 strategy_options.items[i].string);
1138 options.strategy_opts = xstrdup(buf.buf);
1139 }
1140 if (options.strategy) {
1142 options.strategy = xstrdup(options.strategy);
1143 switch (options.type) {
1144 case REBASE_AM:
1145 die(_("--strategy requires --merge or --interactive"));
1146 case REBASE_MERGE:
1147 case REBASE_INTERACTIVE:
1148 case REBASE_PRESERVE_MERGES:
1149 /* compatible */
1150 break;
1151 case REBASE_UNSPECIFIED:
1152 options.type = REBASE_MERGE;
1153 break;
1154 default:
1155 BUG("unhandled rebase type (%d)", options.type);
1156 }
1157 }
1158 if (options.root && !options.onto_name)
1160 imply_interactive(&options, "--root without --onto");
1161 if (isatty(2) && options.flags & REBASE_NO_QUIET)
1163 strbuf_addstr(&options.git_format_patch_opt, " --progress");
1164 switch (options.type) {
1166 case REBASE_MERGE:
1167 case REBASE_INTERACTIVE:
1168 case REBASE_PRESERVE_MERGES:
1169 options.state_dir = merge_dir();
1170 break;
1171 case REBASE_AM:
1172 options.state_dir = apply_dir();
1173 break;
1174 default:
1175 /* the default rebase backend is `--am` */
1176 options.type = REBASE_AM;
1177 options.state_dir = apply_dir();
1178 break;
1179 }
1180 if (options.git_am_opt.len) {
1182 const char *p;
1183 /* all am options except -q are compatible only with --am */
1185 strbuf_reset(&buf);
1186 strbuf_addbuf(&buf, &options.git_am_opt);
1187 strbuf_addch(&buf, ' ');
1188 while ((p = strstr(buf.buf, " -q ")))
1189 strbuf_splice(&buf, p - buf.buf, 4, " ", 1);
1190 strbuf_trim(&buf);
1191 if (is_interactive(&options) && buf.len)
1193 die(_("error: cannot combine interactive options "
1194 "(--interactive, --exec, --rebase-merges, "
1195 "--preserve-merges, --keep-empty, --root + "
1196 "--onto) with am options (%s)"), buf.buf);
1197 if (options.type == REBASE_MERGE && buf.len)
1198 die(_("error: cannot combine merge options (--merge, "
1199 "--strategy, --strategy-option) with am options "
1200 "(%s)"), buf.buf);
1201 }
1202 if (options.signoff) {
1204 if (options.type == REBASE_PRESERVE_MERGES)
1205 die("cannot combine '--signoff' with "
1206 "'--preserve-merges'");
1207 strbuf_addstr(&options.git_am_opt, " --signoff");
1208 options.flags |= REBASE_FORCE;
1209 }
1210 if (options.type == REBASE_PRESERVE_MERGES)
1212 /*
1213 * Note: incompatibility with --signoff handled in signoff block above
1214 * Note: incompatibility with --interactive is just a strong warning;
1215 * git-rebase.txt caveats with "unless you know what you are doing"
1216 */
1217 if (options.rebase_merges)
1218 die(_("error: cannot combine '--preserve_merges' with "
1219 "'--rebase-merges'"));
1220 if (options.rebase_merges) {
1222 if (strategy_options.nr)
1223 die(_("error: cannot combine '--rebase_merges' with "
1224 "'--strategy-option'"));
1225 if (options.strategy)
1226 die(_("error: cannot combine '--rebase_merges' with "
1227 "'--strategy'"));
1228 }
1229 if (!options.root) {
1231 if (argc < 1) {
1232 struct branch *branch;
1233 branch = branch_get(NULL);
1235 options.upstream_name = branch_get_upstream(branch,
1236 NULL);
1237 if (!options.upstream_name)
1238 error_on_missing_default_upstream();
1239 if (fork_point < 0)
1240 fork_point = 1;
1241 } else {
1242 options.upstream_name = argv[0];
1243 argc--;
1244 argv++;
1245 if (!strcmp(options.upstream_name, "-"))
1246 options.upstream_name = "@{-1}";
1247 }
1248 options.upstream = peel_committish(options.upstream_name);
1249 if (!options.upstream)
1250 die(_("invalid upstream '%s'"), options.upstream_name);
1251 options.upstream_arg = options.upstream_name;
1252 } else {
1253 if (!options.onto_name) {
1254 if (commit_tree("", 0, the_hash_algo->empty_tree, NULL,
1255 &squash_onto, NULL, NULL) < 0)
1256 die(_("Could not create new root commit"));
1257 options.squash_onto = &squash_onto;
1258 options.onto_name = squash_onto_name =
1259 xstrdup(oid_to_hex(&squash_onto));
1260 }
1261 options.upstream_name = NULL;
1262 options.upstream = NULL;
1263 if (argc > 1)
1264 usage_with_options(builtin_rebase_usage,
1265 builtin_rebase_options);
1266 options.upstream_arg = "--root";
1267 }
1268 /* Make sure the branch to rebase onto is valid. */
1270 if (!options.onto_name)
1271 options.onto_name = options.upstream_name;
1272 if (strstr(options.onto_name, "...")) {
1273 if (get_oid_mb(options.onto_name, &merge_base) < 0)
1274 die(_("'%s': need exactly one merge base"),
1275 options.onto_name);
1276 options.onto = lookup_commit_or_die(&merge_base,
1277 options.onto_name);
1278 } else {
1279 options.onto = peel_committish(options.onto_name);
1280 if (!options.onto)
1281 die(_("Does not point to a valid commit '%s'"),
1282 options.onto_name);
1283 }
1284 /*
1286 * If the branch to rebase is given, that is the branch we will rebase
1287 * branch_name -- branch/commit being rebased, or
1288 * HEAD (already detached)
1289 * orig_head -- commit object name of tip of the branch before rebasing
1290 * head_name -- refs/heads/<that-branch> or NULL (detached HEAD)
1291 */
1292 if (argc == 1) {
1293 /* Is it "rebase other branchname" or "rebase other commit"? */
1294 branch_name = argv[0];
1295 options.switch_to = argv[0];
1296 /* Is it a local branch? */
1298 strbuf_reset(&buf);
1299 strbuf_addf(&buf, "refs/heads/%s", branch_name);
1300 if (!read_ref(buf.buf, &options.orig_head))
1301 options.head_name = xstrdup(buf.buf);
1302 /* If not is it a valid ref (branch or commit)? */
1303 else if (!get_oid(branch_name, &options.orig_head))
1304 options.head_name = NULL;
1305 else
1306 die(_("fatal: no such branch/commit '%s'"),
1307 branch_name);
1308 } else if (argc == 0) {
1309 /* Do not need to switch branches, we are already on it. */
1310 options.head_name =
1311 xstrdup_or_null(resolve_ref_unsafe("HEAD", 0, NULL,
1312 &flags));
1313 if (!options.head_name)
1314 die(_("No such ref: %s"), "HEAD");
1315 if (flags & REF_ISSYMREF) {
1316 if (!skip_prefix(options.head_name,
1317 "refs/heads/", &branch_name))
1318 branch_name = options.head_name;
1319 } else {
1321 free(options.head_name);
1322 options.head_name = NULL;
1323 branch_name = "HEAD";
1324 }
1325 if (get_oid("HEAD", &options.orig_head))
1326 die(_("Could not resolve HEAD to a revision"));
1327 } else
1328 BUG("unexpected number of arguments left to parse");
1329 if (fork_point > 0) {
1331 struct commit *head =
1332 lookup_commit_reference(the_repository,
1333 &options.orig_head);
1334 options.restrict_revision =
1335 get_fork_point(options.upstream_name, head);
1336 }
1337 if (read_index(the_repository->index) < 0)
1339 die(_("could not read index"));
1340 if (options.autostash) {
1342 struct lock_file lock_file = LOCK_INIT;
1343 int fd;
1344 fd = hold_locked_index(&lock_file, 0);
1346 refresh_cache(REFRESH_QUIET);
1347 if (0 <= fd)
1348 update_index_if_able(&the_index, &lock_file);
1349 rollback_lock_file(&lock_file);
1350 if (has_unstaged_changes(0) || has_uncommitted_changes(0)) {
1352 const char *autostash =
1353 state_dir_path("autostash", &options);
1354 struct child_process stash = CHILD_PROCESS_INIT;
1355 struct object_id oid;
1356 struct commit *head =
1357 lookup_commit_reference(the_repository,
1358 &options.orig_head);
1359 argv_array_pushl(&stash.args,
1361 "stash", "create", "autostash", NULL);
1362 stash.git_cmd = 1;
1363 stash.no_stdin = 1;
1364 strbuf_reset(&buf);
1365 if (capture_command(&stash, &buf, GIT_MAX_HEXSZ))
1366 die(_("Cannot autostash"));
1367 strbuf_trim_trailing_newline(&buf);
1368 if (get_oid(buf.buf, &oid))
1369 die(_("Unexpected stash response: '%s'"),
1370 buf.buf);
1371 strbuf_reset(&buf);
1372 strbuf_add_unique_abbrev(&buf, &oid, DEFAULT_ABBREV);
1373 if (safe_create_leading_directories_const(autostash))
1375 die(_("Could not create directory for '%s'"),
1376 options.state_dir);
1377 write_file(autostash, "%s", oid_to_hex(&oid));
1378 printf(_("Created autostash: %s\n"), buf.buf);
1379 if (reset_head(&head->object.oid, "reset --hard",
1380 NULL, 0, NULL, NULL) < 0)
1381 die(_("could not reset --hard"));
1382 printf(_("HEAD is now at %s"),
1383 find_unique_abbrev(&head->object.oid,
1384 DEFAULT_ABBREV));
1385 strbuf_reset(&buf);
1386 pp_commit_easy(CMIT_FMT_ONELINE, head, &buf);
1387 if (buf.len > 0)
1388 printf(" %s", buf.buf);
1389 putchar('\n');
1390 if (discard_index(the_repository->index) < 0 ||
1392 read_index(the_repository->index) < 0)
1393 die(_("could not read index"));
1394 }
1395 }
1396 if (require_clean_work_tree("rebase",
1398 _("Please commit or stash them."), 1, 1)) {
1399 ret = 1;
1400 goto cleanup;
1401 }
1402 /*
1404 * Now we are rebasing commits upstream..orig_head (or with --root,
1405 * everything leading up to orig_head) on top of onto.
1406 */
1407 /*
1409 * Check if we are already based on onto with linear history,
1410 * but this should be done only when upstream and onto are the same
1411 * and if this is not an interactive rebase.
1412 */
1413 if (can_fast_forward(options.onto, &options.orig_head, &merge_base) &&
1414 !is_interactive(&options) && !options.restrict_revision &&
1415 options.upstream &&
1416 !oidcmp(&options.upstream->object.oid, &options.onto->object.oid)) {
1417 int flag;
1418 if (!(options.flags & REBASE_FORCE)) {
1420 /* Lazily switch to the target branch if needed... */
1421 if (options.switch_to) {
1422 struct object_id oid;
1423 if (get_oid(options.switch_to, &oid) < 0) {
1425 ret = !!error(_("could not parse '%s'"),
1426 options.switch_to);
1427 goto cleanup;
1428 }
1429 strbuf_reset(&buf);
1431 strbuf_addf(&buf, "rebase: checkout %s",
1432 options.switch_to);
1433 if (reset_head(&oid, "checkout",
1434 options.head_name, 0,
1435 NULL, NULL) < 0) {
1436 ret = !!error(_("could not switch to "
1437 "%s"),
1438 options.switch_to);
1439 goto cleanup;
1440 }
1441 }
1442 if (!(options.flags & REBASE_NO_QUIET))
1444 ; /* be quiet */
1445 else if (!strcmp(branch_name, "HEAD") &&
1446 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
1447 puts(_("HEAD is up to date."));
1448 else
1449 printf(_("Current branch %s is up to date.\n"),
1450 branch_name);
1451 ret = !!finish_rebase(&options);
1452 goto cleanup;
1453 } else if (!(options.flags & REBASE_NO_QUIET))
1454 ; /* be quiet */
1455 else if (!strcmp(branch_name, "HEAD") &&
1456 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
1457 puts(_("HEAD is up to date, rebase forced."));
1458 else
1459 printf(_("Current branch %s is up to date, rebase "
1460 "forced.\n"), branch_name);
1461 }
1462 /* If a hook exists, give it a chance to interrupt*/
1464 if (!ok_to_skip_pre_rebase &&
1465 run_hook_le(NULL, "pre-rebase", options.upstream_arg,
1466 argc ? argv[0] : NULL, NULL))
1467 die(_("The pre-rebase hook refused to rebase."));
1468 if (options.flags & REBASE_DIFFSTAT) {
1470 struct diff_options opts;
1471 if (options.flags & REBASE_VERBOSE)
1473 printf(_("Changes from %s to %s:\n"),
1474 oid_to_hex(&merge_base),
1475 oid_to_hex(&options.onto->object.oid));
1476 /* We want color (if set), but no pager */
1478 diff_setup(&opts);
1479 opts.stat_width = -1; /* use full terminal width */
1480 opts.stat_graph_width = -1; /* respect statGraphWidth config */
1481 opts.output_format |=
1482 DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
1483 opts.detect_rename = DIFF_DETECT_RENAME;
1484 diff_setup_done(&opts);
1485 diff_tree_oid(&merge_base, &options.onto->object.oid,
1486 "", &opts);
1487 diffcore_std(&opts);
1488 diff_flush(&opts);
1489 }
1490 if (is_interactive(&options))
1492 goto run_rebase;
1493 /* Detach HEAD and reset the tree */
1495 if (options.flags & REBASE_NO_QUIET)
1496 printf(_("First, rewinding head to replay your work on top of "
1497 "it...\n"));
1498 strbuf_addf(&msg, "rebase: checkout %s", options.onto_name);
1500 if (reset_head(&options.onto->object.oid, "checkout", NULL, 1,
1501 NULL, msg.buf))
1502 die(_("Could not detach HEAD"));
1503 strbuf_release(&msg);
1504 /*
1506 * If the onto is a proper descendant of the tip of the branch, then
1507 * we just fast-forwarded.
1508 */
1509 strbuf_reset(&msg);
1510 if (!oidcmp(&merge_base, &options.orig_head)) {
1511 printf(_("Fast-forwarded %s to %s. \n"),
1512 branch_name, options.onto_name);
1513 strbuf_addf(&msg, "rebase finished: %s onto %s",
1514 options.head_name ? options.head_name : "detached HEAD",
1515 oid_to_hex(&options.onto->object.oid));
1516 reset_head(NULL, "Fast-forwarded", options.head_name, 0,
1517 "HEAD", msg.buf);
1518 strbuf_release(&msg);
1519 ret = !!finish_rebase(&options);
1520 goto cleanup;
1521 }
1522 strbuf_addf(&revisions, "%s..%s",
1524 options.root ? oid_to_hex(&options.onto->object.oid) :
1525 (options.restrict_revision ?
1526 oid_to_hex(&options.restrict_revision->object.oid) :
1527 oid_to_hex(&options.upstream->object.oid)),
1528 oid_to_hex(&options.orig_head));
1529 options.revisions = revisions.buf;
1531run_rebase:
1533 ret = !!run_specific_rebase(&options);
1534cleanup:
1536 strbuf_release(&revisions);
1537 free(options.head_name);
1538 free(options.gpg_sign_opt);
1539 free(options.cmd);
1540 free(squash_onto_name);
1541 return ret;
1542}