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 "commit-reach.h"
25#include "rerere.h"
26#include "branch.h"
27static char const * const builtin_rebase_usage[] = {
29 N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] "
30 "[<upstream>] [<branch>]"),
31 N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] "
32 "--root [<branch>]"),
33 N_("git rebase --continue | --abort | --skip | --edit-todo"),
34 NULL
35};
36static GIT_PATH_FUNC(apply_dir, "rebase-apply")
38static GIT_PATH_FUNC(merge_dir, "rebase-merge")
39enum rebase_type {
41 REBASE_UNSPECIFIED = -1,
42 REBASE_AM,
43 REBASE_MERGE,
44 REBASE_INTERACTIVE,
45 REBASE_PRESERVE_MERGES
46};
47static int use_builtin_rebase(void)
49{
50 struct child_process cp = CHILD_PROCESS_INIT;
51 struct strbuf out = STRBUF_INIT;
52 int ret;
53 argv_array_pushl(&cp.args,
55 "config", "--bool", "rebase.usebuiltin", NULL);
56 cp.git_cmd = 1;
57 if (capture_command(&cp, &out, 6)) {
58 strbuf_release(&out);
59 return 1;
60 }
61 strbuf_trim(&out);
63 ret = !strcmp("true", out.buf);
64 strbuf_release(&out);
65 return ret;
66}
67struct rebase_options {
69 enum rebase_type type;
70 const char *state_dir;
71 struct commit *upstream;
72 const char *upstream_name;
73 const char *upstream_arg;
74 char *head_name;
75 struct object_id orig_head;
76 struct commit *onto;
77 const char *onto_name;
78 const char *revisions;
79 const char *switch_to;
80 int root;
81 struct object_id *squash_onto;
82 struct commit *restrict_revision;
83 int dont_finish_rebase;
84 enum {
85 REBASE_NO_QUIET = 1<<0,
86 REBASE_VERBOSE = 1<<1,
87 REBASE_DIFFSTAT = 1<<2,
88 REBASE_FORCE = 1<<3,
89 REBASE_INTERACTIVE_EXPLICIT = 1<<4,
90 } flags;
91 struct strbuf git_am_opt;
92 const char *action;
93 int signoff;
94 int allow_rerere_autoupdate;
95 int keep_empty;
96 int autosquash;
97 char *gpg_sign_opt;
98 int autostash;
99 char *cmd;
100 int allow_empty_message;
101 int rebase_merges, rebase_cousins;
102 char *strategy, *strategy_opts;
103 struct strbuf git_format_patch_opt;
104};
105static int is_interactive(struct rebase_options *opts)
107{
108 return opts->type == REBASE_INTERACTIVE ||
109 opts->type == REBASE_PRESERVE_MERGES;
110}
111static void imply_interactive(struct rebase_options *opts, const char *option)
113{
114 switch (opts->type) {
115 case REBASE_AM:
116 die(_("%s requires an interactive rebase"), option);
117 break;
118 case REBASE_INTERACTIVE:
119 case REBASE_PRESERVE_MERGES:
120 break;
121 case REBASE_MERGE:
122 /* we silently *upgrade* --merge to --interactive if needed */
123 default:
124 opts->type = REBASE_INTERACTIVE; /* implied */
125 break;
126 }
127}
128/* Returns the filename prefixed by the state_dir */
130static const char *state_dir_path(const char *filename, struct rebase_options *opts)
131{
132 static struct strbuf path = STRBUF_INIT;
133 static size_t prefix_len;
134 if (!prefix_len) {
136 strbuf_addf(&path, "%s/", opts->state_dir);
137 prefix_len = path.len;
138 }
139 strbuf_setlen(&path, prefix_len);
141 strbuf_addstr(&path, filename);
142 return path.buf;
143}
144/* Read one file, then strip line endings */
146static int read_one(const char *path, struct strbuf *buf)
147{
148 if (strbuf_read_file(buf, path, 0) < 0)
149 return error_errno(_("could not read '%s'"), path);
150 strbuf_trim_trailing_newline(buf);
151 return 0;
152}
153/* Initialize the rebase options from the state directory. */
155static int read_basic_state(struct rebase_options *opts)
156{
157 struct strbuf head_name = STRBUF_INIT;
158 struct strbuf buf = STRBUF_INIT;
159 struct object_id oid;
160 if (read_one(state_dir_path("head-name", opts), &head_name) ||
162 read_one(state_dir_path("onto", opts), &buf))
163 return -1;
164 opts->head_name = starts_with(head_name.buf, "refs/") ?
165 xstrdup(head_name.buf) : NULL;
166 strbuf_release(&head_name);
167 if (get_oid(buf.buf, &oid))
168 return error(_("could not get 'onto': '%s'"), buf.buf);
169 opts->onto = lookup_commit_or_die(&oid, buf.buf);
170 /*
172 * We always write to orig-head, but interactive rebase used to write to
173 * head. Fall back to reading from head to cover for the case that the
174 * user upgraded git with an ongoing interactive rebase.
175 */
176 strbuf_reset(&buf);
177 if (file_exists(state_dir_path("orig-head", opts))) {
178 if (read_one(state_dir_path("orig-head", opts), &buf))
179 return -1;
180 } else if (read_one(state_dir_path("head", opts), &buf))
181 return -1;
182 if (get_oid(buf.buf, &opts->orig_head))
183 return error(_("invalid orig-head: '%s'"), buf.buf);
184 strbuf_reset(&buf);
186 if (read_one(state_dir_path("quiet", opts), &buf))
187 return -1;
188 if (buf.len)
189 opts->flags &= ~REBASE_NO_QUIET;
190 else
191 opts->flags |= REBASE_NO_QUIET;
192 if (file_exists(state_dir_path("verbose", opts)))
194 opts->flags |= REBASE_VERBOSE;
195 if (file_exists(state_dir_path("signoff", opts))) {
197 opts->signoff = 1;
198 opts->flags |= REBASE_FORCE;
199 }
200 if (file_exists(state_dir_path("allow_rerere_autoupdate", opts))) {
202 strbuf_reset(&buf);
203 if (read_one(state_dir_path("allow_rerere_autoupdate", opts),
204 &buf))
205 return -1;
206 if (!strcmp(buf.buf, "--rerere-autoupdate"))
207 opts->allow_rerere_autoupdate = 1;
208 else if (!strcmp(buf.buf, "--no-rerere-autoupdate"))
209 opts->allow_rerere_autoupdate = 0;
210 else
211 warning(_("ignoring invalid allow_rerere_autoupdate: "
212 "'%s'"), buf.buf);
213 } else
214 opts->allow_rerere_autoupdate = -1;
215 if (file_exists(state_dir_path("gpg_sign_opt", opts))) {
217 strbuf_reset(&buf);
218 if (read_one(state_dir_path("gpg_sign_opt", opts),
219 &buf))
220 return -1;
221 free(opts->gpg_sign_opt);
222 opts->gpg_sign_opt = xstrdup(buf.buf);
223 }
224 if (file_exists(state_dir_path("strategy", opts))) {
226 strbuf_reset(&buf);
227 if (read_one(state_dir_path("strategy", opts), &buf))
228 return -1;
229 free(opts->strategy);
230 opts->strategy = xstrdup(buf.buf);
231 }
232 if (file_exists(state_dir_path("strategy_opts", opts))) {
234 strbuf_reset(&buf);
235 if (read_one(state_dir_path("strategy_opts", opts), &buf))
236 return -1;
237 free(opts->strategy_opts);
238 opts->strategy_opts = xstrdup(buf.buf);
239 }
240 strbuf_release(&buf);
242 return 0;
244}
245static int apply_autostash(struct rebase_options *opts)
247{
248 const char *path = state_dir_path("autostash", opts);
249 struct strbuf autostash = STRBUF_INIT;
250 struct child_process stash_apply = CHILD_PROCESS_INIT;
251 if (!file_exists(path))
253 return 0;
254 if (read_one(path, &autostash))
256 return error(_("Could not read '%s'"), path);
257 /* Ensure that the hash is not mistaken for a number */
258 strbuf_addstr(&autostash, "^0");
259 argv_array_pushl(&stash_apply.args,
260 "stash", "apply", autostash.buf, NULL);
261 stash_apply.git_cmd = 1;
262 stash_apply.no_stderr = stash_apply.no_stdout =
263 stash_apply.no_stdin = 1;
264 if (!run_command(&stash_apply))
265 printf(_("Applied autostash.\n"));
266 else {
267 struct argv_array args = ARGV_ARRAY_INIT;
268 int res = 0;
269 argv_array_pushl(&args,
271 "stash", "store", "-m", "autostash", "-q",
272 autostash.buf, NULL);
273 if (run_command_v_opt(args.argv, RUN_GIT_CMD))
274 res = error(_("Cannot store %s"), autostash.buf);
275 argv_array_clear(&args);
276 strbuf_release(&autostash);
277 if (res)
278 return res;
279 fprintf(stderr,
281 _("Applying autostash resulted in conflicts.\n"
282 "Your changes are safe in the stash.\n"
283 "You can run \"git stash pop\" or \"git stash drop\" "
284 "at any time.\n"));
285 }
286 strbuf_release(&autostash);
288 return 0;
289}
290static int finish_rebase(struct rebase_options *opts)
292{
293 struct strbuf dir = STRBUF_INIT;
294 const char *argv_gc_auto[] = { "gc", "--auto", NULL };
295 delete_ref(NULL, "REBASE_HEAD", NULL, REF_NO_DEREF);
297 apply_autostash(opts);
298 close_all_packs(the_repository->objects);
299 /*
300 * We ignore errors in 'gc --auto', since the
301 * user should see them.
302 */
303 run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
304 strbuf_addstr(&dir, opts->state_dir);
305 remove_dir_recursively(&dir, 0);
306 strbuf_release(&dir);
307 return 0;
309}
310static struct commit *peel_committish(const char *name)
312{
313 struct object *obj;
314 struct object_id oid;
315 if (get_oid(name, &oid))
317 return NULL;
318 obj = parse_object(the_repository, &oid);
319 return (struct commit *)peel_to_type(name, 0, obj, OBJ_COMMIT);
320}
321static void add_var(struct strbuf *buf, const char *name, const char *value)
323{
324 if (!value)
325 strbuf_addf(buf, "unset %s; ", name);
326 else {
327 strbuf_addf(buf, "%s=", name);
328 sq_quote_buf(buf, value);
329 strbuf_addstr(buf, "; ");
330 }
331}
332static const char *resolvemsg =
334N_("Resolve all conflicts manually, mark them as resolved with\n"
335"\"git add/rm <conflicted_files>\", then run \"git rebase --continue\".\n"
336"You can instead skip this commit: run \"git rebase --skip\".\n"
337"To abort and get back to the state before \"git rebase\", run "
338"\"git rebase --abort\".");
339static int run_specific_rebase(struct rebase_options *opts)
341{
342 const char *argv[] = { NULL, NULL };
343 struct strbuf script_snippet = STRBUF_INIT;
344 int status;
345 const char *backend, *backend_func;
346 if (opts->type == REBASE_INTERACTIVE) {
348 /* Run builtin interactive rebase */
349 struct child_process child = CHILD_PROCESS_INIT;
350 argv_array_pushf(&child.env_array, "GIT_CHERRY_PICK_HELP=%s",
352 resolvemsg);
353 if (!(opts->flags & REBASE_INTERACTIVE_EXPLICIT)) {
354 argv_array_push(&child.env_array, "GIT_EDITOR=:");
355 opts->autosquash = 0;
356 }
357 child.git_cmd = 1;
359 argv_array_push(&child.args, "rebase--interactive");
360 if (opts->action)
362 argv_array_pushf(&child.args, "--%s", opts->action);
363 if (opts->keep_empty)
364 argv_array_push(&child.args, "--keep-empty");
365 if (opts->rebase_merges)
366 argv_array_push(&child.args, "--rebase-merges");
367 if (opts->rebase_cousins)
368 argv_array_push(&child.args, "--rebase-cousins");
369 if (opts->autosquash)
370 argv_array_push(&child.args, "--autosquash");
371 if (opts->flags & REBASE_VERBOSE)
372 argv_array_push(&child.args, "--verbose");
373 if (opts->flags & REBASE_FORCE)
374 argv_array_push(&child.args, "--no-ff");
375 if (opts->restrict_revision)
376 argv_array_pushf(&child.args,
377 "--restrict-revision=^%s",
378 oid_to_hex(&opts->restrict_revision->object.oid));
379 if (opts->upstream)
380 argv_array_pushf(&child.args, "--upstream=%s",
381 oid_to_hex(&opts->upstream->object.oid));
382 if (opts->onto)
383 argv_array_pushf(&child.args, "--onto=%s",
384 oid_to_hex(&opts->onto->object.oid));
385 if (opts->squash_onto)
386 argv_array_pushf(&child.args, "--squash-onto=%s",
387 oid_to_hex(opts->squash_onto));
388 if (opts->onto_name)
389 argv_array_pushf(&child.args, "--onto-name=%s",
390 opts->onto_name);
391 argv_array_pushf(&child.args, "--head-name=%s",
392 opts->head_name ?
393 opts->head_name : "detached HEAD");
394 if (opts->strategy)
395 argv_array_pushf(&child.args, "--strategy=%s",
396 opts->strategy);
397 if (opts->strategy_opts)
398 argv_array_pushf(&child.args, "--strategy-opts=%s",
399 opts->strategy_opts);
400 if (opts->switch_to)
401 argv_array_pushf(&child.args, "--switch-to=%s",
402 opts->switch_to);
403 if (opts->cmd)
404 argv_array_pushf(&child.args, "--cmd=%s", opts->cmd);
405 if (opts->allow_empty_message)
406 argv_array_push(&child.args, "--allow-empty-message");
407 if (opts->allow_rerere_autoupdate > 0)
408 argv_array_push(&child.args, "--rerere-autoupdate");
409 else if (opts->allow_rerere_autoupdate == 0)
410 argv_array_push(&child.args, "--no-rerere-autoupdate");
411 if (opts->gpg_sign_opt)
412 argv_array_push(&child.args, opts->gpg_sign_opt);
413 if (opts->signoff)
414 argv_array_push(&child.args, "--signoff");
415 status = run_command(&child);
417 goto finished_rebase;
418 }
419 add_var(&script_snippet, "GIT_DIR", absolute_path(get_git_dir()));
421 add_var(&script_snippet, "state_dir", opts->state_dir);
422 add_var(&script_snippet, "upstream_name", opts->upstream_name);
424 add_var(&script_snippet, "upstream", opts->upstream ?
425 oid_to_hex(&opts->upstream->object.oid) : NULL);
426 add_var(&script_snippet, "head_name",
427 opts->head_name ? opts->head_name : "detached HEAD");
428 add_var(&script_snippet, "orig_head", oid_to_hex(&opts->orig_head));
429 add_var(&script_snippet, "onto", opts->onto ?
430 oid_to_hex(&opts->onto->object.oid) : NULL);
431 add_var(&script_snippet, "onto_name", opts->onto_name);
432 add_var(&script_snippet, "revisions", opts->revisions);
433 add_var(&script_snippet, "restrict_revision", opts->restrict_revision ?
434 oid_to_hex(&opts->restrict_revision->object.oid) : NULL);
435 add_var(&script_snippet, "GIT_QUIET",
436 opts->flags & REBASE_NO_QUIET ? "" : "t");
437 add_var(&script_snippet, "git_am_opt", opts->git_am_opt.buf);
438 add_var(&script_snippet, "verbose",
439 opts->flags & REBASE_VERBOSE ? "t" : "");
440 add_var(&script_snippet, "diffstat",
441 opts->flags & REBASE_DIFFSTAT ? "t" : "");
442 add_var(&script_snippet, "force_rebase",
443 opts->flags & REBASE_FORCE ? "t" : "");
444 if (opts->switch_to)
445 add_var(&script_snippet, "switch_to", opts->switch_to);
446 add_var(&script_snippet, "action", opts->action ? opts->action : "");
447 add_var(&script_snippet, "signoff", opts->signoff ? "--signoff" : "");
448 add_var(&script_snippet, "allow_rerere_autoupdate",
449 opts->allow_rerere_autoupdate < 0 ? "" :
450 opts->allow_rerere_autoupdate ?
451 "--rerere-autoupdate" : "--no-rerere-autoupdate");
452 add_var(&script_snippet, "keep_empty", opts->keep_empty ? "yes" : "");
453 add_var(&script_snippet, "autosquash", opts->autosquash ? "t" : "");
454 add_var(&script_snippet, "gpg_sign_opt", opts->gpg_sign_opt);
455 add_var(&script_snippet, "cmd", opts->cmd);
456 add_var(&script_snippet, "allow_empty_message",
457 opts->allow_empty_message ? "--allow-empty-message" : "");
458 add_var(&script_snippet, "rebase_merges",
459 opts->rebase_merges ? "t" : "");
460 add_var(&script_snippet, "rebase_cousins",
461 opts->rebase_cousins ? "t" : "");
462 add_var(&script_snippet, "strategy", opts->strategy);
463 add_var(&script_snippet, "strategy_opts", opts->strategy_opts);
464 add_var(&script_snippet, "rebase_root", opts->root ? "t" : "");
465 add_var(&script_snippet, "squash_onto",
466 opts->squash_onto ? oid_to_hex(opts->squash_onto) : "");
467 add_var(&script_snippet, "git_format_patch_opt",
468 opts->git_format_patch_opt.buf);
469 if (is_interactive(opts) &&
471 !(opts->flags & REBASE_INTERACTIVE_EXPLICIT)) {
472 strbuf_addstr(&script_snippet,
473 "GIT_EDITOR=:; export GIT_EDITOR; ");
474 opts->autosquash = 0;
475 }
476 switch (opts->type) {
478 case REBASE_AM:
479 backend = "git-rebase--am";
480 backend_func = "git_rebase__am";
481 break;
482 case REBASE_MERGE:
483 backend = "git-rebase--merge";
484 backend_func = "git_rebase__merge";
485 break;
486 case REBASE_PRESERVE_MERGES:
487 backend = "git-rebase--preserve-merges";
488 backend_func = "git_rebase__preserve_merges";
489 break;
490 default:
491 BUG("Unhandled rebase type %d", opts->type);
492 break;
493 }
494 strbuf_addf(&script_snippet,
496 ". git-sh-setup && . git-rebase--common &&"
497 " . %s && %s", backend, backend_func);
498 argv[0] = script_snippet.buf;
499 status = run_command_v_opt(argv, RUN_USING_SHELL);
501finished_rebase:
502 if (opts->dont_finish_rebase)
503 ; /* do nothing */
504 else if (opts->type == REBASE_INTERACTIVE)
505 ; /* interactive rebase cleans up after itself */
506 else if (status == 0) {
507 if (!file_exists(state_dir_path("stopped-sha", opts)))
508 finish_rebase(opts);
509 } else if (status == 2) {
510 struct strbuf dir = STRBUF_INIT;
511 apply_autostash(opts);
513 strbuf_addstr(&dir, opts->state_dir);
514 remove_dir_recursively(&dir, 0);
515 strbuf_release(&dir);
516 die("Nothing to do");
517 }
518 strbuf_release(&script_snippet);
520 return status ? -1 : 0;
522}
523#define GIT_REFLOG_ACTION_ENVIRONMENT "GIT_REFLOG_ACTION"
525static int reset_head(struct object_id *oid, const char *action,
527 const char *switch_to_branch, int detach_head,
528 const char *reflog_orig_head, const char *reflog_head)
529{
530 struct object_id head_oid;
531 struct tree_desc desc;
532 struct lock_file lock = LOCK_INIT;
533 struct unpack_trees_options unpack_tree_opts;
534 struct tree *tree;
535 const char *reflog_action;
536 struct strbuf msg = STRBUF_INIT;
537 size_t prefix_len;
538 struct object_id *orig = NULL, oid_orig,
539 *old_orig = NULL, oid_old_orig;
540 int ret = 0;
541 if (switch_to_branch && !starts_with(switch_to_branch, "refs/"))
543 BUG("Not a fully qualified branch: '%s'", switch_to_branch);
544 if (hold_locked_index(&lock, LOCK_REPORT_ON_ERROR) < 0)
546 return -1;
547 if (!oid) {
549 if (get_oid("HEAD", &head_oid)) {
550 rollback_lock_file(&lock);
551 return error(_("could not determine HEAD revision"));
552 }
553 oid = &head_oid;
554 }
555 memset(&unpack_tree_opts, 0, sizeof(unpack_tree_opts));
557 setup_unpack_trees_porcelain(&unpack_tree_opts, action);
558 unpack_tree_opts.head_idx = 1;
559 unpack_tree_opts.src_index = the_repository->index;
560 unpack_tree_opts.dst_index = the_repository->index;
561 unpack_tree_opts.fn = oneway_merge;
562 unpack_tree_opts.update = 1;
563 unpack_tree_opts.merge = 1;
564 if (!detach_head)
565 unpack_tree_opts.reset = 1;
566 if (read_index_unmerged(the_repository->index) < 0) {
568 rollback_lock_file(&lock);
569 return error(_("could not read index"));
570 }
571 if (!fill_tree_descriptor(&desc, oid)) {
573 error(_("failed to find tree of %s"), oid_to_hex(oid));
574 rollback_lock_file(&lock);
575 free((void *)desc.buffer);
576 return -1;
577 }
578 if (unpack_trees(1, &desc, &unpack_tree_opts)) {
580 rollback_lock_file(&lock);
581 free((void *)desc.buffer);
582 return -1;
583 }
584 tree = parse_tree_indirect(oid);
586 prime_cache_tree(the_repository->index, tree);
587 if (write_locked_index(the_repository->index, &lock, COMMIT_LOCK) < 0)
589 ret = error(_("could not write index"));
590 free((void *)desc.buffer);
591 if (ret)
593 return ret;
594 reflog_action = getenv(GIT_REFLOG_ACTION_ENVIRONMENT);
596 strbuf_addf(&msg, "%s: ", reflog_action ? reflog_action : "rebase");
597 prefix_len = msg.len;
598 if (!get_oid("ORIG_HEAD", &oid_old_orig))
600 old_orig = &oid_old_orig;
601 if (!get_oid("HEAD", &oid_orig)) {
602 orig = &oid_orig;
603 if (!reflog_orig_head) {
604 strbuf_addstr(&msg, "updating ORIG_HEAD");
605 reflog_orig_head = msg.buf;
606 }
607 update_ref(reflog_orig_head, "ORIG_HEAD", orig, old_orig, 0,
608 UPDATE_REFS_MSG_ON_ERR);
609 } else if (old_orig)
610 delete_ref(NULL, "ORIG_HEAD", old_orig, 0);
611 if (!reflog_head) {
612 strbuf_setlen(&msg, prefix_len);
613 strbuf_addstr(&msg, "updating HEAD");
614 reflog_head = msg.buf;
615 }
616 if (!switch_to_branch)
617 ret = update_ref(reflog_head, "HEAD", oid, orig, REF_NO_DEREF,
618 UPDATE_REFS_MSG_ON_ERR);
619 else {
620 ret = create_symref("HEAD", switch_to_branch, msg.buf);
621 if (!ret)
622 ret = update_ref(reflog_head, "HEAD", oid, NULL, 0,
623 UPDATE_REFS_MSG_ON_ERR);
624 }
625 strbuf_release(&msg);
627 return ret;
628}
629static int rebase_config(const char *var, const char *value, void *data)
631{
632 struct rebase_options *opts = data;
633 if (!strcmp(var, "rebase.stat")) {
635 if (git_config_bool(var, value))
636 opts->flags |= REBASE_DIFFSTAT;
637 else
638 opts->flags &= !REBASE_DIFFSTAT;
639 return 0;
640 }
641 if (!strcmp(var, "rebase.autosquash")) {
643 opts->autosquash = git_config_bool(var, value);
644 return 0;
645 }
646 if (!strcmp(var, "commit.gpgsign")) {
648 free(opts->gpg_sign_opt);
649 opts->gpg_sign_opt = git_config_bool(var, value) ?
650 xstrdup("-S") : NULL;
651 return 0;
652 }
653 if (!strcmp(var, "rebase.autostash")) {
655 opts->autostash = git_config_bool(var, value);
656 return 0;
657 }
658 return git_default_config(var, value, data);
660}
661/*
663 * Determines whether the commits in from..to are linear, i.e. contain
664 * no merge commits. This function *expects* `from` to be an ancestor of
665 * `to`.
666 */
667static int is_linear_history(struct commit *from, struct commit *to)
668{
669 while (to && to != from) {
670 parse_commit(to);
671 if (!to->parents)
672 return 1;
673 if (to->parents->next)
674 return 0;
675 to = to->parents->item;
676 }
677 return 1;
678}
679static int can_fast_forward(struct commit *onto, struct object_id *head_oid,
681 struct object_id *merge_base)
682{
683 struct commit *head = lookup_commit(the_repository, head_oid);
684 struct commit_list *merge_bases;
685 int res;
686 if (!head)
688 return 0;
689 merge_bases = get_merge_bases(onto, head);
691 if (merge_bases && !merge_bases->next) {
692 oidcpy(merge_base, &merge_bases->item->object.oid);
693 res = oideq(merge_base, &onto->object.oid);
694 } else {
695 oidcpy(merge_base, &null_oid);
696 res = 0;
697 }
698 free_commit_list(merge_bases);
699 return res && is_linear_history(onto, head);
700}
701/* -i followed by -m is still -i */
703static int parse_opt_merge(const struct option *opt, const char *arg, int unset)
704{
705 struct rebase_options *opts = opt->value;
706 if (!is_interactive(opts))
708 opts->type = REBASE_MERGE;
709 return 0;
711}
712/* -i followed by -p is still explicitly interactive, but -p alone is not */
714static int parse_opt_interactive(const struct option *opt, const char *arg,
715 int unset)
716{
717 struct rebase_options *opts = opt->value;
718 opts->type = REBASE_INTERACTIVE;
720 opts->flags |= REBASE_INTERACTIVE_EXPLICIT;
721 return 0;
723}
724static void NORETURN error_on_missing_default_upstream(void)
726{
727 struct branch *current_branch = branch_get(NULL);
728 printf(_("%s\n"
730 "Please specify which branch you want to rebase against.\n"
731 "See git-rebase(1) for details.\n"
732 "\n"
733 " git rebase '<branch>'\n"
734 "\n"),
735 current_branch ? _("There is no tracking information for "
736 "the current branch.") :
737 _("You are not currently on a branch."));
738 if (current_branch) {
740 const char *remote = current_branch->remote_name;
741 if (!remote)
743 remote = _("<remote>");
744 printf(_("If you wish to set tracking information for this "
746 "branch you can do so with:\n"
747 "\n"
748 " git branch --set-upstream-to=%s/<branch> %s\n"
749 "\n"),
750 remote, current_branch->name);
751 }
752 exit(1);
753}
754int cmd_rebase(int argc, const char **argv, const char *prefix)
756{
757 struct rebase_options options = {
758 .type = REBASE_UNSPECIFIED,
759 .flags = REBASE_NO_QUIET,
760 .git_am_opt = STRBUF_INIT,
761 .allow_rerere_autoupdate = -1,
762 .allow_empty_message = 1,
763 .git_format_patch_opt = STRBUF_INIT,
764 };
765 const char *branch_name;
766 int ret, flags, total_argc, in_progress = 0;
767 int ok_to_skip_pre_rebase = 0;
768 struct strbuf msg = STRBUF_INIT;
769 struct strbuf revisions = STRBUF_INIT;
770 struct strbuf buf = STRBUF_INIT;
771 struct object_id merge_base;
772 enum {
773 NO_ACTION,
774 ACTION_CONTINUE,
775 ACTION_SKIP,
776 ACTION_ABORT,
777 ACTION_QUIT,
778 ACTION_EDIT_TODO,
779 ACTION_SHOW_CURRENT_PATCH,
780 } action = NO_ACTION;
781 int committer_date_is_author_date = 0;
782 int ignore_date = 0;
783 int ignore_whitespace = 0;
784 const char *gpg_sign = NULL;
785 int opt_c = -1;
786 struct string_list whitespace = STRING_LIST_INIT_NODUP;
787 struct string_list exec = STRING_LIST_INIT_NODUP;
788 const char *rebase_merges = NULL;
789 int fork_point = -1;
790 struct string_list strategy_options = STRING_LIST_INIT_NODUP;
791 struct object_id squash_onto;
792 char *squash_onto_name = NULL;
793 struct option builtin_rebase_options[] = {
794 OPT_STRING(0, "onto", &options.onto_name,
795 N_("revision"),
796 N_("rebase onto given branch instead of upstream")),
797 OPT_BOOL(0, "no-verify", &ok_to_skip_pre_rebase,
798 N_("allow pre-rebase hook to run")),
799 OPT_NEGBIT('q', "quiet", &options.flags,
800 N_("be quiet. implies --no-stat"),
801 REBASE_NO_QUIET| REBASE_VERBOSE | REBASE_DIFFSTAT),
802 OPT_BIT('v', "verbose", &options.flags,
803 N_("display a diffstat of what changed upstream"),
804 REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT),
805 {OPTION_NEGBIT, 'n', "no-stat", &options.flags, NULL,
806 N_("do not show diffstat of what changed upstream"),
807 PARSE_OPT_NOARG, NULL, REBASE_DIFFSTAT },
808 OPT_BOOL(0, "ignore-whitespace", &ignore_whitespace,
809 N_("passed to 'git apply'")),
810 OPT_BOOL(0, "signoff", &options.signoff,
811 N_("add a Signed-off-by: line to each commit")),
812 OPT_BOOL(0, "committer-date-is-author-date",
813 &committer_date_is_author_date,
814 N_("passed to 'git am'")),
815 OPT_BOOL(0, "ignore-date", &ignore_date,
816 N_("passed to 'git am'")),
817 OPT_BIT('f', "force-rebase", &options.flags,
818 N_("cherry-pick all commits, even if unchanged"),
819 REBASE_FORCE),
820 OPT_BIT(0, "no-ff", &options.flags,
821 N_("cherry-pick all commits, even if unchanged"),
822 REBASE_FORCE),
823 OPT_CMDMODE(0, "continue", &action, N_("continue"),
824 ACTION_CONTINUE),
825 OPT_CMDMODE(0, "skip", &action,
826 N_("skip current patch and continue"), ACTION_SKIP),
827 OPT_CMDMODE(0, "abort", &action,
828 N_("abort and check out the original branch"),
829 ACTION_ABORT),
830 OPT_CMDMODE(0, "quit", &action,
831 N_("abort but keep HEAD where it is"), ACTION_QUIT),
832 OPT_CMDMODE(0, "edit-todo", &action, N_("edit the todo list "
833 "during an interactive rebase"), ACTION_EDIT_TODO),
834 OPT_CMDMODE(0, "show-current-patch", &action,
835 N_("show the patch file being applied or merged"),
836 ACTION_SHOW_CURRENT_PATCH),
837 { OPTION_CALLBACK, 'm', "merge", &options, NULL,
838 N_("use merging strategies to rebase"),
839 PARSE_OPT_NOARG | PARSE_OPT_NONEG,
840 parse_opt_merge },
841 { OPTION_CALLBACK, 'i', "interactive", &options, NULL,
842 N_("let the user edit the list of commits to rebase"),
843 PARSE_OPT_NOARG | PARSE_OPT_NONEG,
844 parse_opt_interactive },
845 OPT_SET_INT('p', "preserve-merges", &options.type,
846 N_("try to recreate merges instead of ignoring "
847 "them"), REBASE_PRESERVE_MERGES),
848 OPT_BOOL(0, "rerere-autoupdate",
849 &options.allow_rerere_autoupdate,
850 N_("allow rerere to update index with resolved "
851 "conflict")),
852 OPT_BOOL('k', "keep-empty", &options.keep_empty,
853 N_("preserve empty commits during rebase")),
854 OPT_BOOL(0, "autosquash", &options.autosquash,
855 N_("move commits that begin with "
856 "squash!/fixup! under -i")),
857 { OPTION_STRING, 'S', "gpg-sign", &gpg_sign, N_("key-id"),
858 N_("GPG-sign commits"),
859 PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
860 OPT_STRING_LIST(0, "whitespace", &whitespace,
861 N_("whitespace"), N_("passed to 'git apply'")),
862 OPT_SET_INT('C', NULL, &opt_c, N_("passed to 'git apply'"),
863 REBASE_AM),
864 OPT_BOOL(0, "autostash", &options.autostash,
865 N_("automatically stash/stash pop before and after")),
866 OPT_STRING_LIST('x', "exec", &exec, N_("exec"),
867 N_("add exec lines after each commit of the "
868 "editable list")),
869 OPT_BOOL(0, "allow-empty-message",
870 &options.allow_empty_message,
871 N_("allow rebasing commits with empty messages")),
872 {OPTION_STRING, 'r', "rebase-merges", &rebase_merges,
873 N_("mode"),
874 N_("try to rebase merges instead of skipping them"),
875 PARSE_OPT_OPTARG, NULL, (intptr_t)""},
876 OPT_BOOL(0, "fork-point", &fork_point,
877 N_("use 'merge-base --fork-point' to refine upstream")),
878 OPT_STRING('s', "strategy", &options.strategy,
879 N_("strategy"), N_("use the given merge strategy")),
880 OPT_STRING_LIST('X', "strategy-option", &strategy_options,
881 N_("option"),
882 N_("pass the argument through to the merge "
883 "strategy")),
884 OPT_BOOL(0, "root", &options.root,
885 N_("rebase all reachable commits up to the root(s)")),
886 OPT_END(),
887 };
888 /*
890 * NEEDSWORK: Once the builtin rebase has been tested enough
891 * and git-legacy-rebase.sh is retired to contrib/, this preamble
892 * can be removed.
893 */
894 if (!use_builtin_rebase()) {
896 const char *path = mkpath("%s/git-legacy-rebase",
897 git_exec_path());
898 if (sane_execvp(path, (char **)argv) < 0)
900 die_errno(_("could not exec %s"), path);
901 else
902 BUG("sane_execvp() returned???");
903 }
904 if (argc == 2 && !strcmp(argv[1], "-h"))
906 usage_with_options(builtin_rebase_usage,
907 builtin_rebase_options);
908 prefix = setup_git_directory();
910 trace_repo_setup(prefix);
911 setup_work_tree();
912 git_config(rebase_config, &options);
914 strbuf_reset(&buf);
916 strbuf_addf(&buf, "%s/applying", apply_dir());
917 if(file_exists(buf.buf))
918 die(_("It looks like 'git am' is in progress. Cannot rebase."));
919 if (is_directory(apply_dir())) {
921 options.type = REBASE_AM;
922 options.state_dir = apply_dir();
923 } else if (is_directory(merge_dir())) {
924 strbuf_reset(&buf);
925 strbuf_addf(&buf, "%s/rewritten", merge_dir());
926 if (is_directory(buf.buf)) {
927 options.type = REBASE_PRESERVE_MERGES;
928 options.flags |= REBASE_INTERACTIVE_EXPLICIT;
929 } else {
930 strbuf_reset(&buf);
931 strbuf_addf(&buf, "%s/interactive", merge_dir());
932 if(file_exists(buf.buf)) {
933 options.type = REBASE_INTERACTIVE;
934 options.flags |= REBASE_INTERACTIVE_EXPLICIT;
935 } else
936 options.type = REBASE_MERGE;
937 }
938 options.state_dir = merge_dir();
939 }
940 if (options.type != REBASE_UNSPECIFIED)
942 in_progress = 1;
943 total_argc = argc;
945 argc = parse_options(argc, argv, prefix,
946 builtin_rebase_options,
947 builtin_rebase_usage, 0);
948 if (action != NO_ACTION && total_argc != 2) {
950 usage_with_options(builtin_rebase_usage,
951 builtin_rebase_options);
952 }
953 if (argc > 2)
955 usage_with_options(builtin_rebase_usage,
956 builtin_rebase_options);
957 if (action != NO_ACTION && !in_progress)
959 die(_("No rebase in progress?"));
960 if (action == ACTION_EDIT_TODO && !is_interactive(&options))
962 die(_("The --edit-todo action can only be used during "
963 "interactive rebase."));
964 switch (action) {
966 case ACTION_CONTINUE: {
967 struct object_id head;
968 struct lock_file lock_file = LOCK_INIT;
969 int fd;
970 options.action = "continue";
972 /* Sanity check */
974 if (get_oid("HEAD", &head))
975 die(_("Cannot read HEAD"));
976 fd = hold_locked_index(&lock_file, 0);
978 if (read_index(the_repository->index) < 0)
979 die(_("could not read index"));
980 refresh_index(the_repository->index, REFRESH_QUIET, NULL, NULL,
981 NULL);
982 if (0 <= fd)
983 update_index_if_able(the_repository->index,
984 &lock_file);
985 rollback_lock_file(&lock_file);
986 if (has_unstaged_changes(1)) {
988 puts(_("You must edit all merge conflicts and then\n"
989 "mark them as resolved using git add"));
990 exit(1);
991 }
992 if (read_basic_state(&options))
993 exit(1);
994 goto run_rebase;
995 }
996 case ACTION_SKIP: {
997 struct string_list merge_rr = STRING_LIST_INIT_DUP;
998 options.action = "skip";
1000 rerere_clear(&merge_rr);
1002 string_list_clear(&merge_rr, 1);
1003 if (reset_head(NULL, "reset", NULL, 0, NULL, NULL) < 0)
1005 die(_("could not discard worktree changes"));
1006 remove_branch_state();
1007 if (read_basic_state(&options))
1008 exit(1);
1009 goto run_rebase;
1010 }
1011 case ACTION_ABORT: {
1012 struct string_list merge_rr = STRING_LIST_INIT_DUP;
1013 options.action = "abort";
1014 rerere_clear(&merge_rr);
1016 string_list_clear(&merge_rr, 1);
1017 if (read_basic_state(&options))
1019 exit(1);
1020 if (reset_head(&options.orig_head, "reset",
1021 options.head_name, 0, NULL, NULL) < 0)
1022 die(_("could not move back to %s"),
1023 oid_to_hex(&options.orig_head));
1024 remove_branch_state();
1025 ret = finish_rebase(&options);
1026 goto cleanup;
1027 }
1028 case ACTION_QUIT: {
1029 strbuf_reset(&buf);
1030 strbuf_addstr(&buf, options.state_dir);
1031 ret = !!remove_dir_recursively(&buf, 0);
1032 if (ret)
1033 die(_("could not remove '%s'"), options.state_dir);
1034 goto cleanup;
1035 }
1036 case ACTION_EDIT_TODO:
1037 options.action = "edit-todo";
1038 options.dont_finish_rebase = 1;
1039 goto run_rebase;
1040 case ACTION_SHOW_CURRENT_PATCH:
1041 options.action = "show-current-patch";
1042 options.dont_finish_rebase = 1;
1043 goto run_rebase;
1044 case NO_ACTION:
1045 break;
1046 default:
1047 BUG("action: %d", action);
1048 }
1049 /* Make sure no rebase is in progress */
1051 if (in_progress) {
1052 const char *last_slash = strrchr(options.state_dir, '/');
1053 const char *state_dir_base =
1054 last_slash ? last_slash + 1 : options.state_dir;
1055 const char *cmd_live_rebase =
1056 "git rebase (--continue | --abort | --skip)";
1057 strbuf_reset(&buf);
1058 strbuf_addf(&buf, "rm -fr \"%s\"", options.state_dir);
1059 die(_("It seems that there is already a %s directory, and\n"
1060 "I wonder if you are in the middle of another rebase. "
1061 "If that is the\n"
1062 "case, please try\n\t%s\n"
1063 "If that is not the case, please\n\t%s\n"
1064 "and run me again. I am stopping in case you still "
1065 "have something\n"
1066 "valuable there.\n"),
1067 state_dir_base, cmd_live_rebase, buf.buf);
1068 }
1069 if (!(options.flags & REBASE_NO_QUIET))
1071 strbuf_addstr(&options.git_am_opt, " -q");
1072 if (committer_date_is_author_date) {
1074 strbuf_addstr(&options.git_am_opt,
1075 " --committer-date-is-author-date");
1076 options.flags |= REBASE_FORCE;
1077 }
1078 if (ignore_whitespace)
1080 strbuf_addstr(&options.git_am_opt, " --ignore-whitespace");
1081 if (ignore_date) {
1083 strbuf_addstr(&options.git_am_opt, " --ignore-date");
1084 options.flags |= REBASE_FORCE;
1085 }
1086 if (options.keep_empty)
1088 imply_interactive(&options, "--keep-empty");
1089 if (gpg_sign) {
1091 free(options.gpg_sign_opt);
1092 options.gpg_sign_opt = xstrfmt("-S%s", gpg_sign);
1093 }
1094 if (opt_c >= 0)
1096 strbuf_addf(&options.git_am_opt, " -C%d", opt_c);
1097 if (whitespace.nr) {
1099 int i;
1100 for (i = 0; i < whitespace.nr; i++) {
1102 const char *item = whitespace.items[i].string;
1103 strbuf_addf(&options.git_am_opt, " --whitespace=%s",
1105 item);
1106 if ((!strcmp(item, "fix")) || (!strcmp(item, "strip")))
1108 options.flags |= REBASE_FORCE;
1109 }
1110 }
1111 if (exec.nr) {
1113 int i;
1114 imply_interactive(&options, "--exec");
1116 strbuf_reset(&buf);
1118 for (i = 0; i < exec.nr; i++)
1119 strbuf_addf(&buf, "exec %s\n", exec.items[i].string);
1120 options.cmd = xstrdup(buf.buf);
1121 }
1122 if (rebase_merges) {
1124 if (!*rebase_merges)
1125 ; /* default mode; do nothing */
1126 else if (!strcmp("rebase-cousins", rebase_merges))
1127 options.rebase_cousins = 1;
1128 else if (strcmp("no-rebase-cousins", rebase_merges))
1129 die(_("Unknown mode: %s"), rebase_merges);
1130 options.rebase_merges = 1;
1131 imply_interactive(&options, "--rebase-merges");
1132 }
1133 if (strategy_options.nr) {
1135 int i;
1136 if (!options.strategy)
1138 options.strategy = "recursive";
1139 strbuf_reset(&buf);
1141 for (i = 0; i < strategy_options.nr; i++)
1142 strbuf_addf(&buf, " --%s",
1143 strategy_options.items[i].string);
1144 options.strategy_opts = xstrdup(buf.buf);
1145 }
1146 if (options.strategy) {
1148 options.strategy = xstrdup(options.strategy);
1149 switch (options.type) {
1150 case REBASE_AM:
1151 die(_("--strategy requires --merge or --interactive"));
1152 case REBASE_MERGE:
1153 case REBASE_INTERACTIVE:
1154 case REBASE_PRESERVE_MERGES:
1155 /* compatible */
1156 break;
1157 case REBASE_UNSPECIFIED:
1158 options.type = REBASE_MERGE;
1159 break;
1160 default:
1161 BUG("unhandled rebase type (%d)", options.type);
1162 }
1163 }
1164 if (options.root && !options.onto_name)
1166 imply_interactive(&options, "--root without --onto");
1167 if (isatty(2) && options.flags & REBASE_NO_QUIET)
1169 strbuf_addstr(&options.git_format_patch_opt, " --progress");
1170 switch (options.type) {
1172 case REBASE_MERGE:
1173 case REBASE_INTERACTIVE:
1174 case REBASE_PRESERVE_MERGES:
1175 options.state_dir = merge_dir();
1176 break;
1177 case REBASE_AM:
1178 options.state_dir = apply_dir();
1179 break;
1180 default:
1181 /* the default rebase backend is `--am` */
1182 options.type = REBASE_AM;
1183 options.state_dir = apply_dir();
1184 break;
1185 }
1186 if (options.git_am_opt.len) {
1188 const char *p;
1189 /* all am options except -q are compatible only with --am */
1191 strbuf_reset(&buf);
1192 strbuf_addbuf(&buf, &options.git_am_opt);
1193 strbuf_addch(&buf, ' ');
1194 while ((p = strstr(buf.buf, " -q ")))
1195 strbuf_splice(&buf, p - buf.buf, 4, " ", 1);
1196 strbuf_trim(&buf);
1197 if (is_interactive(&options) && buf.len)
1199 die(_("error: cannot combine interactive options "
1200 "(--interactive, --exec, --rebase-merges, "
1201 "--preserve-merges, --keep-empty, --root + "
1202 "--onto) with am options (%s)"), buf.buf);
1203 if (options.type == REBASE_MERGE && buf.len)
1204 die(_("error: cannot combine merge options (--merge, "
1205 "--strategy, --strategy-option) with am options "
1206 "(%s)"), buf.buf);
1207 }
1208 if (options.signoff) {
1210 if (options.type == REBASE_PRESERVE_MERGES)
1211 die("cannot combine '--signoff' with "
1212 "'--preserve-merges'");
1213 strbuf_addstr(&options.git_am_opt, " --signoff");
1214 options.flags |= REBASE_FORCE;
1215 }
1216 if (options.type == REBASE_PRESERVE_MERGES)
1218 /*
1219 * Note: incompatibility with --signoff handled in signoff block above
1220 * Note: incompatibility with --interactive is just a strong warning;
1221 * git-rebase.txt caveats with "unless you know what you are doing"
1222 */
1223 if (options.rebase_merges)
1224 die(_("error: cannot combine '--preserve-merges' with "
1225 "'--rebase-merges'"));
1226 if (options.rebase_merges) {
1228 if (strategy_options.nr)
1229 die(_("error: cannot combine '--rebase-merges' with "
1230 "'--strategy-option'"));
1231 if (options.strategy)
1232 die(_("error: cannot combine '--rebase-merges' with "
1233 "'--strategy'"));
1234 }
1235 if (!options.root) {
1237 if (argc < 1) {
1238 struct branch *branch;
1239 branch = branch_get(NULL);
1241 options.upstream_name = branch_get_upstream(branch,
1242 NULL);
1243 if (!options.upstream_name)
1244 error_on_missing_default_upstream();
1245 if (fork_point < 0)
1246 fork_point = 1;
1247 } else {
1248 options.upstream_name = argv[0];
1249 argc--;
1250 argv++;
1251 if (!strcmp(options.upstream_name, "-"))
1252 options.upstream_name = "@{-1}";
1253 }
1254 options.upstream = peel_committish(options.upstream_name);
1255 if (!options.upstream)
1256 die(_("invalid upstream '%s'"), options.upstream_name);
1257 options.upstream_arg = options.upstream_name;
1258 } else {
1259 if (!options.onto_name) {
1260 if (commit_tree("", 0, the_hash_algo->empty_tree, NULL,
1261 &squash_onto, NULL, NULL) < 0)
1262 die(_("Could not create new root commit"));
1263 options.squash_onto = &squash_onto;
1264 options.onto_name = squash_onto_name =
1265 xstrdup(oid_to_hex(&squash_onto));
1266 }
1267 options.upstream_name = NULL;
1268 options.upstream = NULL;
1269 if (argc > 1)
1270 usage_with_options(builtin_rebase_usage,
1271 builtin_rebase_options);
1272 options.upstream_arg = "--root";
1273 }
1274 /* Make sure the branch to rebase onto is valid. */
1276 if (!options.onto_name)
1277 options.onto_name = options.upstream_name;
1278 if (strstr(options.onto_name, "...")) {
1279 if (get_oid_mb(options.onto_name, &merge_base) < 0)
1280 die(_("'%s': need exactly one merge base"),
1281 options.onto_name);
1282 options.onto = lookup_commit_or_die(&merge_base,
1283 options.onto_name);
1284 } else {
1285 options.onto = peel_committish(options.onto_name);
1286 if (!options.onto)
1287 die(_("Does not point to a valid commit '%s'"),
1288 options.onto_name);
1289 }
1290 /*
1292 * If the branch to rebase is given, that is the branch we will rebase
1293 * branch_name -- branch/commit being rebased, or
1294 * HEAD (already detached)
1295 * orig_head -- commit object name of tip of the branch before rebasing
1296 * head_name -- refs/heads/<that-branch> or NULL (detached HEAD)
1297 */
1298 if (argc == 1) {
1299 /* Is it "rebase other branchname" or "rebase other commit"? */
1300 branch_name = argv[0];
1301 options.switch_to = argv[0];
1302 /* Is it a local branch? */
1304 strbuf_reset(&buf);
1305 strbuf_addf(&buf, "refs/heads/%s", branch_name);
1306 if (!read_ref(buf.buf, &options.orig_head))
1307 options.head_name = xstrdup(buf.buf);
1308 /* If not is it a valid ref (branch or commit)? */
1309 else if (!get_oid(branch_name, &options.orig_head))
1310 options.head_name = NULL;
1311 else
1312 die(_("fatal: no such branch/commit '%s'"),
1313 branch_name);
1314 } else if (argc == 0) {
1315 /* Do not need to switch branches, we are already on it. */
1316 options.head_name =
1317 xstrdup_or_null(resolve_ref_unsafe("HEAD", 0, NULL,
1318 &flags));
1319 if (!options.head_name)
1320 die(_("No such ref: %s"), "HEAD");
1321 if (flags & REF_ISSYMREF) {
1322 if (!skip_prefix(options.head_name,
1323 "refs/heads/", &branch_name))
1324 branch_name = options.head_name;
1325 } else {
1327 free(options.head_name);
1328 options.head_name = NULL;
1329 branch_name = "HEAD";
1330 }
1331 if (get_oid("HEAD", &options.orig_head))
1332 die(_("Could not resolve HEAD to a revision"));
1333 } else
1334 BUG("unexpected number of arguments left to parse");
1335 if (fork_point > 0) {
1337 struct commit *head =
1338 lookup_commit_reference(the_repository,
1339 &options.orig_head);
1340 options.restrict_revision =
1341 get_fork_point(options.upstream_name, head);
1342 }
1343 if (read_index(the_repository->index) < 0)
1345 die(_("could not read index"));
1346 if (options.autostash) {
1348 struct lock_file lock_file = LOCK_INIT;
1349 int fd;
1350 fd = hold_locked_index(&lock_file, 0);
1352 refresh_cache(REFRESH_QUIET);
1353 if (0 <= fd)
1354 update_index_if_able(&the_index, &lock_file);
1355 rollback_lock_file(&lock_file);
1356 if (has_unstaged_changes(1) || has_uncommitted_changes(1)) {
1358 const char *autostash =
1359 state_dir_path("autostash", &options);
1360 struct child_process stash = CHILD_PROCESS_INIT;
1361 struct object_id oid;
1362 struct commit *head =
1363 lookup_commit_reference(the_repository,
1364 &options.orig_head);
1365 argv_array_pushl(&stash.args,
1367 "stash", "create", "autostash", NULL);
1368 stash.git_cmd = 1;
1369 stash.no_stdin = 1;
1370 strbuf_reset(&buf);
1371 if (capture_command(&stash, &buf, GIT_MAX_HEXSZ))
1372 die(_("Cannot autostash"));
1373 strbuf_trim_trailing_newline(&buf);
1374 if (get_oid(buf.buf, &oid))
1375 die(_("Unexpected stash response: '%s'"),
1376 buf.buf);
1377 strbuf_reset(&buf);
1378 strbuf_add_unique_abbrev(&buf, &oid, DEFAULT_ABBREV);
1379 if (safe_create_leading_directories_const(autostash))
1381 die(_("Could not create directory for '%s'"),
1382 options.state_dir);
1383 write_file(autostash, "%s", oid_to_hex(&oid));
1384 printf(_("Created autostash: %s\n"), buf.buf);
1385 if (reset_head(&head->object.oid, "reset --hard",
1386 NULL, 0, NULL, NULL) < 0)
1387 die(_("could not reset --hard"));
1388 printf(_("HEAD is now at %s"),
1389 find_unique_abbrev(&head->object.oid,
1390 DEFAULT_ABBREV));
1391 strbuf_reset(&buf);
1392 pp_commit_easy(CMIT_FMT_ONELINE, head, &buf);
1393 if (buf.len > 0)
1394 printf(" %s", buf.buf);
1395 putchar('\n');
1396 if (discard_index(the_repository->index) < 0 ||
1398 read_index(the_repository->index) < 0)
1399 die(_("could not read index"));
1400 }
1401 }
1402 if (require_clean_work_tree("rebase",
1404 _("Please commit or stash them."), 1, 1)) {
1405 ret = 1;
1406 goto cleanup;
1407 }
1408 /*
1410 * Now we are rebasing commits upstream..orig_head (or with --root,
1411 * everything leading up to orig_head) on top of onto.
1412 */
1413 /*
1415 * Check if we are already based on onto with linear history,
1416 * but this should be done only when upstream and onto are the same
1417 * and if this is not an interactive rebase.
1418 */
1419 if (can_fast_forward(options.onto, &options.orig_head, &merge_base) &&
1420 !is_interactive(&options) && !options.restrict_revision &&
1421 options.upstream &&
1422 !oidcmp(&options.upstream->object.oid, &options.onto->object.oid)) {
1423 int flag;
1424 if (!(options.flags & REBASE_FORCE)) {
1426 /* Lazily switch to the target branch if needed... */
1427 if (options.switch_to) {
1428 struct object_id oid;
1429 if (get_oid(options.switch_to, &oid) < 0) {
1431 ret = !!error(_("could not parse '%s'"),
1432 options.switch_to);
1433 goto cleanup;
1434 }
1435 strbuf_reset(&buf);
1437 strbuf_addf(&buf, "rebase: checkout %s",
1438 options.switch_to);
1439 if (reset_head(&oid, "checkout",
1440 options.head_name, 0,
1441 NULL, NULL) < 0) {
1442 ret = !!error(_("could not switch to "
1443 "%s"),
1444 options.switch_to);
1445 goto cleanup;
1446 }
1447 }
1448 if (!(options.flags & REBASE_NO_QUIET))
1450 ; /* be quiet */
1451 else if (!strcmp(branch_name, "HEAD") &&
1452 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
1453 puts(_("HEAD is up to date."));
1454 else
1455 printf(_("Current branch %s is up to date.\n"),
1456 branch_name);
1457 ret = !!finish_rebase(&options);
1458 goto cleanup;
1459 } else if (!(options.flags & REBASE_NO_QUIET))
1460 ; /* be quiet */
1461 else if (!strcmp(branch_name, "HEAD") &&
1462 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
1463 puts(_("HEAD is up to date, rebase forced."));
1464 else
1465 printf(_("Current branch %s is up to date, rebase "
1466 "forced.\n"), branch_name);
1467 }
1468 /* If a hook exists, give it a chance to interrupt*/
1470 if (!ok_to_skip_pre_rebase &&
1471 run_hook_le(NULL, "pre-rebase", options.upstream_arg,
1472 argc ? argv[0] : NULL, NULL))
1473 die(_("The pre-rebase hook refused to rebase."));
1474 if (options.flags & REBASE_DIFFSTAT) {
1476 struct diff_options opts;
1477 if (options.flags & REBASE_VERBOSE)
1479 printf(_("Changes from %s to %s:\n"),
1480 oid_to_hex(&merge_base),
1481 oid_to_hex(&options.onto->object.oid));
1482 /* We want color (if set), but no pager */
1484 diff_setup(&opts);
1485 opts.stat_width = -1; /* use full terminal width */
1486 opts.stat_graph_width = -1; /* respect statGraphWidth config */
1487 opts.output_format |=
1488 DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
1489 opts.detect_rename = DIFF_DETECT_RENAME;
1490 diff_setup_done(&opts);
1491 diff_tree_oid(&merge_base, &options.onto->object.oid,
1492 "", &opts);
1493 diffcore_std(&opts);
1494 diff_flush(&opts);
1495 }
1496 if (is_interactive(&options))
1498 goto run_rebase;
1499 /* Detach HEAD and reset the tree */
1501 if (options.flags & REBASE_NO_QUIET)
1502 printf(_("First, rewinding head to replay your work on top of "
1503 "it...\n"));
1504 strbuf_addf(&msg, "rebase: checkout %s", options.onto_name);
1506 if (reset_head(&options.onto->object.oid, "checkout", NULL, 1,
1507 NULL, msg.buf))
1508 die(_("Could not detach HEAD"));
1509 strbuf_release(&msg);
1510 /*
1512 * If the onto is a proper descendant of the tip of the branch, then
1513 * we just fast-forwarded.
1514 */
1515 strbuf_reset(&msg);
1516 if (!oidcmp(&merge_base, &options.orig_head)) {
1517 printf(_("Fast-forwarded %s to %s. \n"),
1518 branch_name, options.onto_name);
1519 strbuf_addf(&msg, "rebase finished: %s onto %s",
1520 options.head_name ? options.head_name : "detached HEAD",
1521 oid_to_hex(&options.onto->object.oid));
1522 reset_head(NULL, "Fast-forwarded", options.head_name, 0,
1523 "HEAD", msg.buf);
1524 strbuf_release(&msg);
1525 ret = !!finish_rebase(&options);
1526 goto cleanup;
1527 }
1528 strbuf_addf(&revisions, "%s..%s",
1530 options.root ? oid_to_hex(&options.onto->object.oid) :
1531 (options.restrict_revision ?
1532 oid_to_hex(&options.restrict_revision->object.oid) :
1533 oid_to_hex(&options.upstream->object.oid)),
1534 oid_to_hex(&options.orig_head));
1535 options.revisions = revisions.buf;
1537run_rebase:
1539 ret = !!run_specific_rebase(&options);
1540cleanup:
1542 strbuf_release(&revisions);
1543 free(options.head_name);
1544 free(options.gpg_sign_opt);
1545 free(options.cmd);
1546 free(squash_onto_name);
1547 return ret;
1548}