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, env = git_env_bool("GIT_TEST_REBASE_USE_BUILTIN", -1);
53 if (env != -1)
55 return env;
56 argv_array_pushl(&cp.args,
58 "config", "--bool", "rebase.usebuiltin", NULL);
59 cp.git_cmd = 1;
60 if (capture_command(&cp, &out, 6)) {
61 strbuf_release(&out);
62 return 1;
63 }
64 strbuf_trim(&out);
66 ret = !strcmp("true", out.buf);
67 strbuf_release(&out);
68 return ret;
69}
70struct rebase_options {
72 enum rebase_type type;
73 const char *state_dir;
74 struct commit *upstream;
75 const char *upstream_name;
76 const char *upstream_arg;
77 char *head_name;
78 struct object_id orig_head;
79 struct commit *onto;
80 const char *onto_name;
81 const char *revisions;
82 const char *switch_to;
83 int root;
84 struct object_id *squash_onto;
85 struct commit *restrict_revision;
86 int dont_finish_rebase;
87 enum {
88 REBASE_NO_QUIET = 1<<0,
89 REBASE_VERBOSE = 1<<1,
90 REBASE_DIFFSTAT = 1<<2,
91 REBASE_FORCE = 1<<3,
92 REBASE_INTERACTIVE_EXPLICIT = 1<<4,
93 } flags;
94 struct argv_array git_am_opts;
95 const char *action;
96 int signoff;
97 int allow_rerere_autoupdate;
98 int keep_empty;
99 int autosquash;
100 char *gpg_sign_opt;
101 int autostash;
102 char *cmd;
103 int allow_empty_message;
104 int rebase_merges, rebase_cousins;
105 char *strategy, *strategy_opts;
106 struct strbuf git_format_patch_opt;
107};
108static int is_interactive(struct rebase_options *opts)
110{
111 return opts->type == REBASE_INTERACTIVE ||
112 opts->type == REBASE_PRESERVE_MERGES;
113}
114static void imply_interactive(struct rebase_options *opts, const char *option)
116{
117 switch (opts->type) {
118 case REBASE_AM:
119 die(_("%s requires an interactive rebase"), option);
120 break;
121 case REBASE_INTERACTIVE:
122 case REBASE_PRESERVE_MERGES:
123 break;
124 case REBASE_MERGE:
125 /* we silently *upgrade* --merge to --interactive if needed */
126 default:
127 opts->type = REBASE_INTERACTIVE; /* implied */
128 break;
129 }
130}
131/* Returns the filename prefixed by the state_dir */
133static const char *state_dir_path(const char *filename, struct rebase_options *opts)
134{
135 static struct strbuf path = STRBUF_INIT;
136 static size_t prefix_len;
137 if (!prefix_len) {
139 strbuf_addf(&path, "%s/", opts->state_dir);
140 prefix_len = path.len;
141 }
142 strbuf_setlen(&path, prefix_len);
144 strbuf_addstr(&path, filename);
145 return path.buf;
146}
147/* Read one file, then strip line endings */
149static int read_one(const char *path, struct strbuf *buf)
150{
151 if (strbuf_read_file(buf, path, 0) < 0)
152 return error_errno(_("could not read '%s'"), path);
153 strbuf_trim_trailing_newline(buf);
154 return 0;
155}
156/* Initialize the rebase options from the state directory. */
158static int read_basic_state(struct rebase_options *opts)
159{
160 struct strbuf head_name = STRBUF_INIT;
161 struct strbuf buf = STRBUF_INIT;
162 struct object_id oid;
163 if (read_one(state_dir_path("head-name", opts), &head_name) ||
165 read_one(state_dir_path("onto", opts), &buf))
166 return -1;
167 opts->head_name = starts_with(head_name.buf, "refs/") ?
168 xstrdup(head_name.buf) : NULL;
169 strbuf_release(&head_name);
170 if (get_oid(buf.buf, &oid))
171 return error(_("could not get 'onto': '%s'"), buf.buf);
172 opts->onto = lookup_commit_or_die(&oid, buf.buf);
173 /*
175 * We always write to orig-head, but interactive rebase used to write to
176 * head. Fall back to reading from head to cover for the case that the
177 * user upgraded git with an ongoing interactive rebase.
178 */
179 strbuf_reset(&buf);
180 if (file_exists(state_dir_path("orig-head", opts))) {
181 if (read_one(state_dir_path("orig-head", opts), &buf))
182 return -1;
183 } else if (read_one(state_dir_path("head", opts), &buf))
184 return -1;
185 if (get_oid(buf.buf, &opts->orig_head))
186 return error(_("invalid orig-head: '%s'"), buf.buf);
187 strbuf_reset(&buf);
189 if (read_one(state_dir_path("quiet", opts), &buf))
190 return -1;
191 if (buf.len)
192 opts->flags &= ~REBASE_NO_QUIET;
193 else
194 opts->flags |= REBASE_NO_QUIET;
195 if (file_exists(state_dir_path("verbose", opts)))
197 opts->flags |= REBASE_VERBOSE;
198 if (file_exists(state_dir_path("signoff", opts))) {
200 opts->signoff = 1;
201 opts->flags |= REBASE_FORCE;
202 }
203 if (file_exists(state_dir_path("allow_rerere_autoupdate", opts))) {
205 strbuf_reset(&buf);
206 if (read_one(state_dir_path("allow_rerere_autoupdate", opts),
207 &buf))
208 return -1;
209 if (!strcmp(buf.buf, "--rerere-autoupdate"))
210 opts->allow_rerere_autoupdate = 1;
211 else if (!strcmp(buf.buf, "--no-rerere-autoupdate"))
212 opts->allow_rerere_autoupdate = 0;
213 else
214 warning(_("ignoring invalid allow_rerere_autoupdate: "
215 "'%s'"), buf.buf);
216 } else
217 opts->allow_rerere_autoupdate = -1;
218 if (file_exists(state_dir_path("gpg_sign_opt", opts))) {
220 strbuf_reset(&buf);
221 if (read_one(state_dir_path("gpg_sign_opt", opts),
222 &buf))
223 return -1;
224 free(opts->gpg_sign_opt);
225 opts->gpg_sign_opt = xstrdup(buf.buf);
226 }
227 if (file_exists(state_dir_path("strategy", opts))) {
229 strbuf_reset(&buf);
230 if (read_one(state_dir_path("strategy", opts), &buf))
231 return -1;
232 free(opts->strategy);
233 opts->strategy = xstrdup(buf.buf);
234 }
235 if (file_exists(state_dir_path("strategy_opts", opts))) {
237 strbuf_reset(&buf);
238 if (read_one(state_dir_path("strategy_opts", opts), &buf))
239 return -1;
240 free(opts->strategy_opts);
241 opts->strategy_opts = xstrdup(buf.buf);
242 }
243 strbuf_release(&buf);
245 return 0;
247}
248static int apply_autostash(struct rebase_options *opts)
250{
251 const char *path = state_dir_path("autostash", opts);
252 struct strbuf autostash = STRBUF_INIT;
253 struct child_process stash_apply = CHILD_PROCESS_INIT;
254 if (!file_exists(path))
256 return 0;
257 if (read_one(path, &autostash))
259 return error(_("Could not read '%s'"), path);
260 /* Ensure that the hash is not mistaken for a number */
261 strbuf_addstr(&autostash, "^0");
262 argv_array_pushl(&stash_apply.args,
263 "stash", "apply", autostash.buf, NULL);
264 stash_apply.git_cmd = 1;
265 stash_apply.no_stderr = stash_apply.no_stdout =
266 stash_apply.no_stdin = 1;
267 if (!run_command(&stash_apply))
268 printf(_("Applied autostash.\n"));
269 else {
270 struct argv_array args = ARGV_ARRAY_INIT;
271 int res = 0;
272 argv_array_pushl(&args,
274 "stash", "store", "-m", "autostash", "-q",
275 autostash.buf, NULL);
276 if (run_command_v_opt(args.argv, RUN_GIT_CMD))
277 res = error(_("Cannot store %s"), autostash.buf);
278 argv_array_clear(&args);
279 strbuf_release(&autostash);
280 if (res)
281 return res;
282 fprintf(stderr,
284 _("Applying autostash resulted in conflicts.\n"
285 "Your changes are safe in the stash.\n"
286 "You can run \"git stash pop\" or \"git stash drop\" "
287 "at any time.\n"));
288 }
289 strbuf_release(&autostash);
291 return 0;
292}
293static int finish_rebase(struct rebase_options *opts)
295{
296 struct strbuf dir = STRBUF_INIT;
297 const char *argv_gc_auto[] = { "gc", "--auto", NULL };
298 delete_ref(NULL, "REBASE_HEAD", NULL, REF_NO_DEREF);
300 apply_autostash(opts);
301 close_all_packs(the_repository->objects);
302 /*
303 * We ignore errors in 'gc --auto', since the
304 * user should see them.
305 */
306 run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
307 strbuf_addstr(&dir, opts->state_dir);
308 remove_dir_recursively(&dir, 0);
309 strbuf_release(&dir);
310 return 0;
312}
313static struct commit *peel_committish(const char *name)
315{
316 struct object *obj;
317 struct object_id oid;
318 if (get_oid(name, &oid))
320 return NULL;
321 obj = parse_object(the_repository, &oid);
322 return (struct commit *)peel_to_type(name, 0, obj, OBJ_COMMIT);
323}
324static void add_var(struct strbuf *buf, const char *name, const char *value)
326{
327 if (!value)
328 strbuf_addf(buf, "unset %s; ", name);
329 else {
330 strbuf_addf(buf, "%s=", name);
331 sq_quote_buf(buf, value);
332 strbuf_addstr(buf, "; ");
333 }
334}
335static const char *resolvemsg =
337N_("Resolve all conflicts manually, mark them as resolved with\n"
338"\"git add/rm <conflicted_files>\", then run \"git rebase --continue\".\n"
339"You can instead skip this commit: run \"git rebase --skip\".\n"
340"To abort and get back to the state before \"git rebase\", run "
341"\"git rebase --abort\".");
342static int run_specific_rebase(struct rebase_options *opts)
344{
345 const char *argv[] = { NULL, NULL };
346 struct strbuf script_snippet = STRBUF_INIT, buf = STRBUF_INIT;
347 int status;
348 const char *backend, *backend_func;
349 if (opts->type == REBASE_INTERACTIVE) {
351 /* Run builtin interactive rebase */
352 struct child_process child = CHILD_PROCESS_INIT;
353 argv_array_pushf(&child.env_array, "GIT_CHERRY_PICK_HELP=%s",
355 resolvemsg);
356 if (!(opts->flags & REBASE_INTERACTIVE_EXPLICIT)) {
357 argv_array_push(&child.env_array, "GIT_EDITOR=:");
358 opts->autosquash = 0;
359 }
360 child.git_cmd = 1;
362 argv_array_push(&child.args, "rebase--interactive");
363 if (opts->action)
365 argv_array_pushf(&child.args, "--%s", opts->action);
366 if (opts->keep_empty)
367 argv_array_push(&child.args, "--keep-empty");
368 if (opts->rebase_merges)
369 argv_array_push(&child.args, "--rebase-merges");
370 if (opts->rebase_cousins)
371 argv_array_push(&child.args, "--rebase-cousins");
372 if (opts->autosquash)
373 argv_array_push(&child.args, "--autosquash");
374 if (opts->flags & REBASE_VERBOSE)
375 argv_array_push(&child.args, "--verbose");
376 if (opts->flags & REBASE_FORCE)
377 argv_array_push(&child.args, "--no-ff");
378 if (opts->restrict_revision)
379 argv_array_pushf(&child.args,
380 "--restrict-revision=^%s",
381 oid_to_hex(&opts->restrict_revision->object.oid));
382 if (opts->upstream)
383 argv_array_pushf(&child.args, "--upstream=%s",
384 oid_to_hex(&opts->upstream->object.oid));
385 if (opts->onto)
386 argv_array_pushf(&child.args, "--onto=%s",
387 oid_to_hex(&opts->onto->object.oid));
388 if (opts->squash_onto)
389 argv_array_pushf(&child.args, "--squash-onto=%s",
390 oid_to_hex(opts->squash_onto));
391 if (opts->onto_name)
392 argv_array_pushf(&child.args, "--onto-name=%s",
393 opts->onto_name);
394 argv_array_pushf(&child.args, "--head-name=%s",
395 opts->head_name ?
396 opts->head_name : "detached HEAD");
397 if (opts->strategy)
398 argv_array_pushf(&child.args, "--strategy=%s",
399 opts->strategy);
400 if (opts->strategy_opts)
401 argv_array_pushf(&child.args, "--strategy-opts=%s",
402 opts->strategy_opts);
403 if (opts->switch_to)
404 argv_array_pushf(&child.args, "--switch-to=%s",
405 opts->switch_to);
406 if (opts->cmd)
407 argv_array_pushf(&child.args, "--cmd=%s", opts->cmd);
408 if (opts->allow_empty_message)
409 argv_array_push(&child.args, "--allow-empty-message");
410 if (opts->allow_rerere_autoupdate > 0)
411 argv_array_push(&child.args, "--rerere-autoupdate");
412 else if (opts->allow_rerere_autoupdate == 0)
413 argv_array_push(&child.args, "--no-rerere-autoupdate");
414 if (opts->gpg_sign_opt)
415 argv_array_push(&child.args, opts->gpg_sign_opt);
416 if (opts->signoff)
417 argv_array_push(&child.args, "--signoff");
418 status = run_command(&child);
420 goto finished_rebase;
421 }
422 add_var(&script_snippet, "GIT_DIR", absolute_path(get_git_dir()));
424 add_var(&script_snippet, "state_dir", opts->state_dir);
425 add_var(&script_snippet, "upstream_name", opts->upstream_name);
427 add_var(&script_snippet, "upstream", opts->upstream ?
428 oid_to_hex(&opts->upstream->object.oid) : NULL);
429 add_var(&script_snippet, "head_name",
430 opts->head_name ? opts->head_name : "detached HEAD");
431 add_var(&script_snippet, "orig_head", oid_to_hex(&opts->orig_head));
432 add_var(&script_snippet, "onto", opts->onto ?
433 oid_to_hex(&opts->onto->object.oid) : NULL);
434 add_var(&script_snippet, "onto_name", opts->onto_name);
435 add_var(&script_snippet, "revisions", opts->revisions);
436 add_var(&script_snippet, "restrict_revision", opts->restrict_revision ?
437 oid_to_hex(&opts->restrict_revision->object.oid) : NULL);
438 add_var(&script_snippet, "GIT_QUIET",
439 opts->flags & REBASE_NO_QUIET ? "" : "t");
440 sq_quote_argv_pretty(&buf, opts->git_am_opts.argv);
441 add_var(&script_snippet, "git_am_opt", buf.buf);
442 strbuf_release(&buf);
443 add_var(&script_snippet, "verbose",
444 opts->flags & REBASE_VERBOSE ? "t" : "");
445 add_var(&script_snippet, "diffstat",
446 opts->flags & REBASE_DIFFSTAT ? "t" : "");
447 add_var(&script_snippet, "force_rebase",
448 opts->flags & REBASE_FORCE ? "t" : "");
449 if (opts->switch_to)
450 add_var(&script_snippet, "switch_to", opts->switch_to);
451 add_var(&script_snippet, "action", opts->action ? opts->action : "");
452 add_var(&script_snippet, "signoff", opts->signoff ? "--signoff" : "");
453 add_var(&script_snippet, "allow_rerere_autoupdate",
454 opts->allow_rerere_autoupdate < 0 ? "" :
455 opts->allow_rerere_autoupdate ?
456 "--rerere-autoupdate" : "--no-rerere-autoupdate");
457 add_var(&script_snippet, "keep_empty", opts->keep_empty ? "yes" : "");
458 add_var(&script_snippet, "autosquash", opts->autosquash ? "t" : "");
459 add_var(&script_snippet, "gpg_sign_opt", opts->gpg_sign_opt);
460 add_var(&script_snippet, "cmd", opts->cmd);
461 add_var(&script_snippet, "allow_empty_message",
462 opts->allow_empty_message ? "--allow-empty-message" : "");
463 add_var(&script_snippet, "rebase_merges",
464 opts->rebase_merges ? "t" : "");
465 add_var(&script_snippet, "rebase_cousins",
466 opts->rebase_cousins ? "t" : "");
467 add_var(&script_snippet, "strategy", opts->strategy);
468 add_var(&script_snippet, "strategy_opts", opts->strategy_opts);
469 add_var(&script_snippet, "rebase_root", opts->root ? "t" : "");
470 add_var(&script_snippet, "squash_onto",
471 opts->squash_onto ? oid_to_hex(opts->squash_onto) : "");
472 add_var(&script_snippet, "git_format_patch_opt",
473 opts->git_format_patch_opt.buf);
474 if (is_interactive(opts) &&
476 !(opts->flags & REBASE_INTERACTIVE_EXPLICIT)) {
477 strbuf_addstr(&script_snippet,
478 "GIT_EDITOR=:; export GIT_EDITOR; ");
479 opts->autosquash = 0;
480 }
481 switch (opts->type) {
483 case REBASE_AM:
484 backend = "git-rebase--am";
485 backend_func = "git_rebase__am";
486 break;
487 case REBASE_MERGE:
488 backend = "git-rebase--merge";
489 backend_func = "git_rebase__merge";
490 break;
491 case REBASE_PRESERVE_MERGES:
492 backend = "git-rebase--preserve-merges";
493 backend_func = "git_rebase__preserve_merges";
494 break;
495 default:
496 BUG("Unhandled rebase type %d", opts->type);
497 break;
498 }
499 strbuf_addf(&script_snippet,
501 ". git-sh-setup && . git-rebase--common &&"
502 " . %s && %s", backend, backend_func);
503 argv[0] = script_snippet.buf;
504 status = run_command_v_opt(argv, RUN_USING_SHELL);
506finished_rebase:
507 if (opts->dont_finish_rebase)
508 ; /* do nothing */
509 else if (opts->type == REBASE_INTERACTIVE)
510 ; /* interactive rebase cleans up after itself */
511 else if (status == 0) {
512 if (!file_exists(state_dir_path("stopped-sha", opts)))
513 finish_rebase(opts);
514 } else if (status == 2) {
515 struct strbuf dir = STRBUF_INIT;
516 apply_autostash(opts);
518 strbuf_addstr(&dir, opts->state_dir);
519 remove_dir_recursively(&dir, 0);
520 strbuf_release(&dir);
521 die("Nothing to do");
522 }
523 strbuf_release(&script_snippet);
525 return status ? -1 : 0;
527}
528#define GIT_REFLOG_ACTION_ENVIRONMENT "GIT_REFLOG_ACTION"
530#define RESET_HEAD_DETACH (1<<0)
532#define RESET_HEAD_HARD (1<<1)
533static int reset_head(struct object_id *oid, const char *action,
535 const char *switch_to_branch, unsigned flags,
536 const char *reflog_orig_head, const char *reflog_head)
537{
538 unsigned detach_head = flags & RESET_HEAD_DETACH;
539 unsigned reset_hard = flags & RESET_HEAD_HARD;
540 struct object_id head_oid;
541 struct tree_desc desc[2] = { { NULL }, { NULL } };
542 struct lock_file lock = LOCK_INIT;
543 struct unpack_trees_options unpack_tree_opts;
544 struct tree *tree;
545 const char *reflog_action;
546 struct strbuf msg = STRBUF_INIT;
547 size_t prefix_len;
548 struct object_id *orig = NULL, oid_orig,
549 *old_orig = NULL, oid_old_orig;
550 int ret = 0, nr = 0;
551 if (switch_to_branch && !starts_with(switch_to_branch, "refs/"))
553 BUG("Not a fully qualified branch: '%s'", switch_to_branch);
554 if (hold_locked_index(&lock, LOCK_REPORT_ON_ERROR) < 0) {
556 ret = -1;
557 goto leave_reset_head;
558 }
559 if ((!oid || !reset_hard) && get_oid("HEAD", &head_oid)) {
561 ret = error(_("could not determine HEAD revision"));
562 goto leave_reset_head;
563 }
564 if (!oid)
566 oid = &head_oid;
567 memset(&unpack_tree_opts, 0, sizeof(unpack_tree_opts));
569 setup_unpack_trees_porcelain(&unpack_tree_opts, action);
570 unpack_tree_opts.head_idx = 1;
571 unpack_tree_opts.src_index = the_repository->index;
572 unpack_tree_opts.dst_index = the_repository->index;
573 unpack_tree_opts.fn = reset_hard ? oneway_merge : twoway_merge;
574 unpack_tree_opts.update = 1;
575 unpack_tree_opts.merge = 1;
576 if (!detach_head)
577 unpack_tree_opts.reset = 1;
578 if (read_index_unmerged(the_repository->index) < 0) {
580 ret = error(_("could not read index"));
581 goto leave_reset_head;
582 }
583 if (!reset_hard && !fill_tree_descriptor(&desc[nr++], &head_oid)) {
585 ret = error(_("failed to find tree of %s"), oid_to_hex(oid));
586 goto leave_reset_head;
587 }
588 if (!fill_tree_descriptor(&desc[nr++], oid)) {
590 ret = error(_("failed to find tree of %s"), oid_to_hex(oid));
591 goto leave_reset_head;
592 }
593 if (unpack_trees(nr, desc, &unpack_tree_opts)) {
595 ret = -1;
596 goto leave_reset_head;
597 }
598 tree = parse_tree_indirect(oid);
600 prime_cache_tree(the_repository->index, tree);
601 if (write_locked_index(the_repository->index, &lock, COMMIT_LOCK) < 0) {
603 ret = error(_("could not write index"));
604 goto leave_reset_head;
605 }
606 reflog_action = getenv(GIT_REFLOG_ACTION_ENVIRONMENT);
608 strbuf_addf(&msg, "%s: ", reflog_action ? reflog_action : "rebase");
609 prefix_len = msg.len;
610 if (!get_oid("ORIG_HEAD", &oid_old_orig))
612 old_orig = &oid_old_orig;
613 if (!get_oid("HEAD", &oid_orig)) {
614 orig = &oid_orig;
615 if (!reflog_orig_head) {
616 strbuf_addstr(&msg, "updating ORIG_HEAD");
617 reflog_orig_head = msg.buf;
618 }
619 update_ref(reflog_orig_head, "ORIG_HEAD", orig, old_orig, 0,
620 UPDATE_REFS_MSG_ON_ERR);
621 } else if (old_orig)
622 delete_ref(NULL, "ORIG_HEAD", old_orig, 0);
623 if (!reflog_head) {
624 strbuf_setlen(&msg, prefix_len);
625 strbuf_addstr(&msg, "updating HEAD");
626 reflog_head = msg.buf;
627 }
628 if (!switch_to_branch)
629 ret = update_ref(reflog_head, "HEAD", oid, orig,
630 detach_head ? REF_NO_DEREF : 0,
631 UPDATE_REFS_MSG_ON_ERR);
632 else {
633 ret = create_symref("HEAD", switch_to_branch, msg.buf);
634 if (!ret)
635 ret = update_ref(reflog_head, "HEAD", oid, NULL, 0,
636 UPDATE_REFS_MSG_ON_ERR);
637 }
638leave_reset_head:
640 strbuf_release(&msg);
641 rollback_lock_file(&lock);
642 while (nr)
643 free((void *)desc[--nr].buffer);
644 return ret;
645}
646static int rebase_config(const char *var, const char *value, void *data)
648{
649 struct rebase_options *opts = data;
650 if (!strcmp(var, "rebase.stat")) {
652 if (git_config_bool(var, value))
653 opts->flags |= REBASE_DIFFSTAT;
654 else
655 opts->flags &= !REBASE_DIFFSTAT;
656 return 0;
657 }
658 if (!strcmp(var, "rebase.autosquash")) {
660 opts->autosquash = git_config_bool(var, value);
661 return 0;
662 }
663 if (!strcmp(var, "commit.gpgsign")) {
665 free(opts->gpg_sign_opt);
666 opts->gpg_sign_opt = git_config_bool(var, value) ?
667 xstrdup("-S") : NULL;
668 return 0;
669 }
670 if (!strcmp(var, "rebase.autostash")) {
672 opts->autostash = git_config_bool(var, value);
673 return 0;
674 }
675 return git_default_config(var, value, data);
677}
678/*
680 * Determines whether the commits in from..to are linear, i.e. contain
681 * no merge commits. This function *expects* `from` to be an ancestor of
682 * `to`.
683 */
684static int is_linear_history(struct commit *from, struct commit *to)
685{
686 while (to && to != from) {
687 parse_commit(to);
688 if (!to->parents)
689 return 1;
690 if (to->parents->next)
691 return 0;
692 to = to->parents->item;
693 }
694 return 1;
695}
696static int can_fast_forward(struct commit *onto, struct object_id *head_oid,
698 struct object_id *merge_base)
699{
700 struct commit *head = lookup_commit(the_repository, head_oid);
701 struct commit_list *merge_bases;
702 int res;
703 if (!head)
705 return 0;
706 merge_bases = get_merge_bases(onto, head);
708 if (merge_bases && !merge_bases->next) {
709 oidcpy(merge_base, &merge_bases->item->object.oid);
710 res = oideq(merge_base, &onto->object.oid);
711 } else {
712 oidcpy(merge_base, &null_oid);
713 res = 0;
714 }
715 free_commit_list(merge_bases);
716 return res && is_linear_history(onto, head);
717}
718/* -i followed by -m is still -i */
720static int parse_opt_merge(const struct option *opt, const char *arg, int unset)
721{
722 struct rebase_options *opts = opt->value;
723 BUG_ON_OPT_NEG(unset);
725 BUG_ON_OPT_ARG(arg);
726 if (!is_interactive(opts))
728 opts->type = REBASE_MERGE;
729 return 0;
731}
732/* -i followed by -p is still explicitly interactive, but -p alone is not */
734static int parse_opt_interactive(const struct option *opt, const char *arg,
735 int unset)
736{
737 struct rebase_options *opts = opt->value;
738 BUG_ON_OPT_NEG(unset);
740 BUG_ON_OPT_ARG(arg);
741 opts->type = REBASE_INTERACTIVE;
743 opts->flags |= REBASE_INTERACTIVE_EXPLICIT;
744 return 0;
746}
747static void NORETURN error_on_missing_default_upstream(void)
749{
750 struct branch *current_branch = branch_get(NULL);
751 printf(_("%s\n"
753 "Please specify which branch you want to rebase against.\n"
754 "See git-rebase(1) for details.\n"
755 "\n"
756 " git rebase '<branch>'\n"
757 "\n"),
758 current_branch ? _("There is no tracking information for "
759 "the current branch.") :
760 _("You are not currently on a branch."));
761 if (current_branch) {
763 const char *remote = current_branch->remote_name;
764 if (!remote)
766 remote = _("<remote>");
767 printf(_("If you wish to set tracking information for this "
769 "branch you can do so with:\n"
770 "\n"
771 " git branch --set-upstream-to=%s/<branch> %s\n"
772 "\n"),
773 remote, current_branch->name);
774 }
775 exit(1);
776}
777int cmd_rebase(int argc, const char **argv, const char *prefix)
779{
780 struct rebase_options options = {
781 .type = REBASE_UNSPECIFIED,
782 .flags = REBASE_NO_QUIET,
783 .git_am_opts = ARGV_ARRAY_INIT,
784 .allow_rerere_autoupdate = -1,
785 .allow_empty_message = 1,
786 .git_format_patch_opt = STRBUF_INIT,
787 };
788 const char *branch_name;
789 int ret, flags, total_argc, in_progress = 0;
790 int ok_to_skip_pre_rebase = 0;
791 struct strbuf msg = STRBUF_INIT;
792 struct strbuf revisions = STRBUF_INIT;
793 struct strbuf buf = STRBUF_INIT;
794 struct object_id merge_base;
795 enum {
796 NO_ACTION,
797 ACTION_CONTINUE,
798 ACTION_SKIP,
799 ACTION_ABORT,
800 ACTION_QUIT,
801 ACTION_EDIT_TODO,
802 ACTION_SHOW_CURRENT_PATCH,
803 } action = NO_ACTION;
804 const char *gpg_sign = NULL;
805 struct string_list exec = STRING_LIST_INIT_NODUP;
806 const char *rebase_merges = NULL;
807 int fork_point = -1;
808 struct string_list strategy_options = STRING_LIST_INIT_NODUP;
809 struct object_id squash_onto;
810 char *squash_onto_name = NULL;
811 struct option builtin_rebase_options[] = {
812 OPT_STRING(0, "onto", &options.onto_name,
813 N_("revision"),
814 N_("rebase onto given branch instead of upstream")),
815 OPT_BOOL(0, "no-verify", &ok_to_skip_pre_rebase,
816 N_("allow pre-rebase hook to run")),
817 OPT_NEGBIT('q', "quiet", &options.flags,
818 N_("be quiet. implies --no-stat"),
819 REBASE_NO_QUIET| REBASE_VERBOSE | REBASE_DIFFSTAT),
820 OPT_BIT('v', "verbose", &options.flags,
821 N_("display a diffstat of what changed upstream"),
822 REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT),
823 {OPTION_NEGBIT, 'n', "no-stat", &options.flags, NULL,
824 N_("do not show diffstat of what changed upstream"),
825 PARSE_OPT_NOARG, NULL, REBASE_DIFFSTAT },
826 OPT_BOOL(0, "signoff", &options.signoff,
827 N_("add a Signed-off-by: line to each commit")),
828 OPT_PASSTHRU_ARGV(0, "ignore-whitespace", &options.git_am_opts,
829 NULL, N_("passed to 'git am'"),
830 PARSE_OPT_NOARG),
831 OPT_PASSTHRU_ARGV(0, "committer-date-is-author-date",
832 &options.git_am_opts, NULL,
833 N_("passed to 'git am'"), PARSE_OPT_NOARG),
834 OPT_PASSTHRU_ARGV(0, "ignore-date", &options.git_am_opts, NULL,
835 N_("passed to 'git am'"), PARSE_OPT_NOARG),
836 OPT_PASSTHRU_ARGV('C', NULL, &options.git_am_opts, N_("n"),
837 N_("passed to 'git apply'"), 0),
838 OPT_PASSTHRU_ARGV(0, "whitespace", &options.git_am_opts,
839 N_("action"), N_("passed to 'git apply'"), 0),
840 OPT_BIT('f', "force-rebase", &options.flags,
841 N_("cherry-pick all commits, even if unchanged"),
842 REBASE_FORCE),
843 OPT_BIT(0, "no-ff", &options.flags,
844 N_("cherry-pick all commits, even if unchanged"),
845 REBASE_FORCE),
846 OPT_CMDMODE(0, "continue", &action, N_("continue"),
847 ACTION_CONTINUE),
848 OPT_CMDMODE(0, "skip", &action,
849 N_("skip current patch and continue"), ACTION_SKIP),
850 OPT_CMDMODE(0, "abort", &action,
851 N_("abort and check out the original branch"),
852 ACTION_ABORT),
853 OPT_CMDMODE(0, "quit", &action,
854 N_("abort but keep HEAD where it is"), ACTION_QUIT),
855 OPT_CMDMODE(0, "edit-todo", &action, N_("edit the todo list "
856 "during an interactive rebase"), ACTION_EDIT_TODO),
857 OPT_CMDMODE(0, "show-current-patch", &action,
858 N_("show the patch file being applied or merged"),
859 ACTION_SHOW_CURRENT_PATCH),
860 { OPTION_CALLBACK, 'm', "merge", &options, NULL,
861 N_("use merging strategies to rebase"),
862 PARSE_OPT_NOARG | PARSE_OPT_NONEG,
863 parse_opt_merge },
864 { OPTION_CALLBACK, 'i', "interactive", &options, NULL,
865 N_("let the user edit the list of commits to rebase"),
866 PARSE_OPT_NOARG | PARSE_OPT_NONEG,
867 parse_opt_interactive },
868 OPT_SET_INT('p', "preserve-merges", &options.type,
869 N_("try to recreate merges instead of ignoring "
870 "them"), REBASE_PRESERVE_MERGES),
871 OPT_BOOL(0, "rerere-autoupdate",
872 &options.allow_rerere_autoupdate,
873 N_("allow rerere to update index with resolved "
874 "conflict")),
875 OPT_BOOL('k', "keep-empty", &options.keep_empty,
876 N_("preserve empty commits during rebase")),
877 OPT_BOOL(0, "autosquash", &options.autosquash,
878 N_("move commits that begin with "
879 "squash!/fixup! under -i")),
880 { OPTION_STRING, 'S', "gpg-sign", &gpg_sign, N_("key-id"),
881 N_("GPG-sign commits"),
882 PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
883 OPT_BOOL(0, "autostash", &options.autostash,
884 N_("automatically stash/stash pop before and after")),
885 OPT_STRING_LIST('x', "exec", &exec, N_("exec"),
886 N_("add exec lines after each commit of the "
887 "editable list")),
888 OPT_BOOL(0, "allow-empty-message",
889 &options.allow_empty_message,
890 N_("allow rebasing commits with empty messages")),
891 {OPTION_STRING, 'r', "rebase-merges", &rebase_merges,
892 N_("mode"),
893 N_("try to rebase merges instead of skipping them"),
894 PARSE_OPT_OPTARG, NULL, (intptr_t)""},
895 OPT_BOOL(0, "fork-point", &fork_point,
896 N_("use 'merge-base --fork-point' to refine upstream")),
897 OPT_STRING('s', "strategy", &options.strategy,
898 N_("strategy"), N_("use the given merge strategy")),
899 OPT_STRING_LIST('X', "strategy-option", &strategy_options,
900 N_("option"),
901 N_("pass the argument through to the merge "
902 "strategy")),
903 OPT_BOOL(0, "root", &options.root,
904 N_("rebase all reachable commits up to the root(s)")),
905 OPT_END(),
906 };
907 int i;
908 /*
910 * NEEDSWORK: Once the builtin rebase has been tested enough
911 * and git-legacy-rebase.sh is retired to contrib/, this preamble
912 * can be removed.
913 */
914 if (!use_builtin_rebase()) {
916 const char *path = mkpath("%s/git-legacy-rebase",
917 git_exec_path());
918 if (sane_execvp(path, (char **)argv) < 0)
920 die_errno(_("could not exec %s"), path);
921 else
922 BUG("sane_execvp() returned???");
923 }
924 if (argc == 2 && !strcmp(argv[1], "-h"))
926 usage_with_options(builtin_rebase_usage,
927 builtin_rebase_options);
928 prefix = setup_git_directory();
930 trace_repo_setup(prefix);
931 setup_work_tree();
932 git_config(rebase_config, &options);
934 strbuf_reset(&buf);
936 strbuf_addf(&buf, "%s/applying", apply_dir());
937 if(file_exists(buf.buf))
938 die(_("It looks like 'git am' is in progress. Cannot rebase."));
939 if (is_directory(apply_dir())) {
941 options.type = REBASE_AM;
942 options.state_dir = apply_dir();
943 } else if (is_directory(merge_dir())) {
944 strbuf_reset(&buf);
945 strbuf_addf(&buf, "%s/rewritten", merge_dir());
946 if (is_directory(buf.buf)) {
947 options.type = REBASE_PRESERVE_MERGES;
948 options.flags |= REBASE_INTERACTIVE_EXPLICIT;
949 } else {
950 strbuf_reset(&buf);
951 strbuf_addf(&buf, "%s/interactive", merge_dir());
952 if(file_exists(buf.buf)) {
953 options.type = REBASE_INTERACTIVE;
954 options.flags |= REBASE_INTERACTIVE_EXPLICIT;
955 } else
956 options.type = REBASE_MERGE;
957 }
958 options.state_dir = merge_dir();
959 }
960 if (options.type != REBASE_UNSPECIFIED)
962 in_progress = 1;
963 total_argc = argc;
965 argc = parse_options(argc, argv, prefix,
966 builtin_rebase_options,
967 builtin_rebase_usage, 0);
968 if (action != NO_ACTION && total_argc != 2) {
970 usage_with_options(builtin_rebase_usage,
971 builtin_rebase_options);
972 }
973 if (argc > 2)
975 usage_with_options(builtin_rebase_usage,
976 builtin_rebase_options);
977 if (action != NO_ACTION && !in_progress)
979 die(_("No rebase in progress?"));
980 if (action == ACTION_EDIT_TODO && !is_interactive(&options))
982 die(_("The --edit-todo action can only be used during "
983 "interactive rebase."));
984 switch (action) {
986 case ACTION_CONTINUE: {
987 struct object_id head;
988 struct lock_file lock_file = LOCK_INIT;
989 int fd;
990 options.action = "continue";
992 /* Sanity check */
994 if (get_oid("HEAD", &head))
995 die(_("Cannot read HEAD"));
996 fd = hold_locked_index(&lock_file, 0);
998 if (read_index(the_repository->index) < 0)
999 die(_("could not read index"));
1000 refresh_index(the_repository->index, REFRESH_QUIET, NULL, NULL,
1001 NULL);
1002 if (0 <= fd)
1003 update_index_if_able(the_repository->index,
1004 &lock_file);
1005 rollback_lock_file(&lock_file);
1006 if (has_unstaged_changes(1)) {
1008 puts(_("You must edit all merge conflicts and then\n"
1009 "mark them as resolved using git add"));
1010 exit(1);
1011 }
1012 if (read_basic_state(&options))
1013 exit(1);
1014 goto run_rebase;
1015 }
1016 case ACTION_SKIP: {
1017 struct string_list merge_rr = STRING_LIST_INIT_DUP;
1018 options.action = "skip";
1020 rerere_clear(&merge_rr);
1022 string_list_clear(&merge_rr, 1);
1023 if (reset_head(NULL, "reset", NULL, RESET_HEAD_HARD,
1025 NULL, NULL) < 0)
1026 die(_("could not discard worktree changes"));
1027 remove_branch_state();
1028 if (read_basic_state(&options))
1029 exit(1);
1030 goto run_rebase;
1031 }
1032 case ACTION_ABORT: {
1033 struct string_list merge_rr = STRING_LIST_INIT_DUP;
1034 options.action = "abort";
1035 rerere_clear(&merge_rr);
1037 string_list_clear(&merge_rr, 1);
1038 if (read_basic_state(&options))
1040 exit(1);
1041 if (reset_head(&options.orig_head, "reset",
1042 options.head_name, RESET_HEAD_HARD,
1043 NULL, NULL) < 0)
1044 die(_("could not move back to %s"),
1045 oid_to_hex(&options.orig_head));
1046 remove_branch_state();
1047 ret = finish_rebase(&options);
1048 goto cleanup;
1049 }
1050 case ACTION_QUIT: {
1051 strbuf_reset(&buf);
1052 strbuf_addstr(&buf, options.state_dir);
1053 ret = !!remove_dir_recursively(&buf, 0);
1054 if (ret)
1055 die(_("could not remove '%s'"), options.state_dir);
1056 goto cleanup;
1057 }
1058 case ACTION_EDIT_TODO:
1059 options.action = "edit-todo";
1060 options.dont_finish_rebase = 1;
1061 goto run_rebase;
1062 case ACTION_SHOW_CURRENT_PATCH:
1063 options.action = "show-current-patch";
1064 options.dont_finish_rebase = 1;
1065 goto run_rebase;
1066 case NO_ACTION:
1067 break;
1068 default:
1069 BUG("action: %d", action);
1070 }
1071 /* Make sure no rebase is in progress */
1073 if (in_progress) {
1074 const char *last_slash = strrchr(options.state_dir, '/');
1075 const char *state_dir_base =
1076 last_slash ? last_slash + 1 : options.state_dir;
1077 const char *cmd_live_rebase =
1078 "git rebase (--continue | --abort | --skip)";
1079 strbuf_reset(&buf);
1080 strbuf_addf(&buf, "rm -fr \"%s\"", options.state_dir);
1081 die(_("It seems that there is already a %s directory, and\n"
1082 "I wonder if you are in the middle of another rebase. "
1083 "If that is the\n"
1084 "case, please try\n\t%s\n"
1085 "If that is not the case, please\n\t%s\n"
1086 "and run me again. I am stopping in case you still "
1087 "have something\n"
1088 "valuable there.\n"),
1089 state_dir_base, cmd_live_rebase, buf.buf);
1090 }
1091 for (i = 0; i < options.git_am_opts.argc; i++) {
1093 const char *option = options.git_am_opts.argv[i], *p;
1094 if (!strcmp(option, "--committer-date-is-author-date") ||
1095 !strcmp(option, "--ignore-date") ||
1096 !strcmp(option, "--whitespace=fix") ||
1097 !strcmp(option, "--whitespace=strip"))
1098 options.flags |= REBASE_FORCE;
1099 else if (skip_prefix(option, "-C", &p)) {
1100 while (*p)
1101 if (!isdigit(*(p++)))
1102 die(_("switch `C' expects a "
1103 "numerical value"));
1104 } else if (skip_prefix(option, "--whitespace=", &p)) {
1105 if (*p && strcmp(p, "warn") && strcmp(p, "nowarn") &&
1106 strcmp(p, "error") && strcmp(p, "error-all"))
1107 die("Invalid whitespace option: '%s'", p);
1108 }
1109 }
1110 if (!(options.flags & REBASE_NO_QUIET))
1112 argv_array_push(&options.git_am_opts, "-q");
1113 if (options.keep_empty)
1115 imply_interactive(&options, "--keep-empty");
1116 if (gpg_sign) {
1118 free(options.gpg_sign_opt);
1119 options.gpg_sign_opt = xstrfmt("-S%s", gpg_sign);
1120 }
1121 if (exec.nr) {
1123 int i;
1124 imply_interactive(&options, "--exec");
1126 strbuf_reset(&buf);
1128 for (i = 0; i < exec.nr; i++)
1129 strbuf_addf(&buf, "exec %s\n", exec.items[i].string);
1130 options.cmd = xstrdup(buf.buf);
1131 }
1132 if (rebase_merges) {
1134 if (!*rebase_merges)
1135 ; /* default mode; do nothing */
1136 else if (!strcmp("rebase-cousins", rebase_merges))
1137 options.rebase_cousins = 1;
1138 else if (strcmp("no-rebase-cousins", rebase_merges))
1139 die(_("Unknown mode: %s"), rebase_merges);
1140 options.rebase_merges = 1;
1141 imply_interactive(&options, "--rebase-merges");
1142 }
1143 if (strategy_options.nr) {
1145 int i;
1146 if (!options.strategy)
1148 options.strategy = "recursive";
1149 strbuf_reset(&buf);
1151 for (i = 0; i < strategy_options.nr; i++)
1152 strbuf_addf(&buf, " --%s",
1153 strategy_options.items[i].string);
1154 options.strategy_opts = xstrdup(buf.buf);
1155 }
1156 if (options.strategy) {
1158 options.strategy = xstrdup(options.strategy);
1159 switch (options.type) {
1160 case REBASE_AM:
1161 die(_("--strategy requires --merge or --interactive"));
1162 case REBASE_MERGE:
1163 case REBASE_INTERACTIVE:
1164 case REBASE_PRESERVE_MERGES:
1165 /* compatible */
1166 break;
1167 case REBASE_UNSPECIFIED:
1168 options.type = REBASE_MERGE;
1169 break;
1170 default:
1171 BUG("unhandled rebase type (%d)", options.type);
1172 }
1173 }
1174 if (options.root && !options.onto_name)
1176 imply_interactive(&options, "--root without --onto");
1177 if (isatty(2) && options.flags & REBASE_NO_QUIET)
1179 strbuf_addstr(&options.git_format_patch_opt, " --progress");
1180 switch (options.type) {
1182 case REBASE_MERGE:
1183 case REBASE_INTERACTIVE:
1184 case REBASE_PRESERVE_MERGES:
1185 options.state_dir = merge_dir();
1186 break;
1187 case REBASE_AM:
1188 options.state_dir = apply_dir();
1189 break;
1190 default:
1191 /* the default rebase backend is `--am` */
1192 options.type = REBASE_AM;
1193 options.state_dir = apply_dir();
1194 break;
1195 }
1196 if (options.git_am_opts.argc) {
1198 /* all am options except -q are compatible only with --am */
1199 for (i = options.git_am_opts.argc - 1; i >= 0; i--)
1200 if (strcmp(options.git_am_opts.argv[i], "-q"))
1201 break;
1202 if (is_interactive(&options) && i >= 0)
1204 die(_("error: cannot combine interactive options "
1205 "(--interactive, --exec, --rebase-merges, "
1206 "--preserve-merges, --keep-empty, --root + "
1207 "--onto) with am options (%s)"), buf.buf);
1208 if (options.type == REBASE_MERGE && i >= 0)
1209 die(_("error: cannot combine merge options (--merge, "
1210 "--strategy, --strategy-option) with am options "
1211 "(%s)"), buf.buf);
1212 }
1213 if (options.signoff) {
1215 if (options.type == REBASE_PRESERVE_MERGES)
1216 die("cannot combine '--signoff' with "
1217 "'--preserve-merges'");
1218 argv_array_push(&options.git_am_opts, "--signoff");
1219 options.flags |= REBASE_FORCE;
1220 }
1221 if (options.type == REBASE_PRESERVE_MERGES)
1223 /*
1224 * Note: incompatibility with --signoff handled in signoff block above
1225 * Note: incompatibility with --interactive is just a strong warning;
1226 * git-rebase.txt caveats with "unless you know what you are doing"
1227 */
1228 if (options.rebase_merges)
1229 die(_("error: cannot combine '--preserve-merges' with "
1230 "'--rebase-merges'"));
1231 if (options.rebase_merges) {
1233 if (strategy_options.nr)
1234 die(_("error: cannot combine '--rebase-merges' with "
1235 "'--strategy-option'"));
1236 if (options.strategy)
1237 die(_("error: cannot combine '--rebase-merges' with "
1238 "'--strategy'"));
1239 }
1240 if (!options.root) {
1242 if (argc < 1) {
1243 struct branch *branch;
1244 branch = branch_get(NULL);
1246 options.upstream_name = branch_get_upstream(branch,
1247 NULL);
1248 if (!options.upstream_name)
1249 error_on_missing_default_upstream();
1250 if (fork_point < 0)
1251 fork_point = 1;
1252 } else {
1253 options.upstream_name = argv[0];
1254 argc--;
1255 argv++;
1256 if (!strcmp(options.upstream_name, "-"))
1257 options.upstream_name = "@{-1}";
1258 }
1259 options.upstream = peel_committish(options.upstream_name);
1260 if (!options.upstream)
1261 die(_("invalid upstream '%s'"), options.upstream_name);
1262 options.upstream_arg = options.upstream_name;
1263 } else {
1264 if (!options.onto_name) {
1265 if (commit_tree("", 0, the_hash_algo->empty_tree, NULL,
1266 &squash_onto, NULL, NULL) < 0)
1267 die(_("Could not create new root commit"));
1268 options.squash_onto = &squash_onto;
1269 options.onto_name = squash_onto_name =
1270 xstrdup(oid_to_hex(&squash_onto));
1271 }
1272 options.upstream_name = NULL;
1273 options.upstream = NULL;
1274 if (argc > 1)
1275 usage_with_options(builtin_rebase_usage,
1276 builtin_rebase_options);
1277 options.upstream_arg = "--root";
1278 }
1279 /* Make sure the branch to rebase onto is valid. */
1281 if (!options.onto_name)
1282 options.onto_name = options.upstream_name;
1283 if (strstr(options.onto_name, "...")) {
1284 if (get_oid_mb(options.onto_name, &merge_base) < 0)
1285 die(_("'%s': need exactly one merge base"),
1286 options.onto_name);
1287 options.onto = lookup_commit_or_die(&merge_base,
1288 options.onto_name);
1289 } else {
1290 options.onto = peel_committish(options.onto_name);
1291 if (!options.onto)
1292 die(_("Does not point to a valid commit '%s'"),
1293 options.onto_name);
1294 }
1295 /*
1297 * If the branch to rebase is given, that is the branch we will rebase
1298 * branch_name -- branch/commit being rebased, or
1299 * HEAD (already detached)
1300 * orig_head -- commit object name of tip of the branch before rebasing
1301 * head_name -- refs/heads/<that-branch> or NULL (detached HEAD)
1302 */
1303 if (argc == 1) {
1304 /* Is it "rebase other branchname" or "rebase other commit"? */
1305 branch_name = argv[0];
1306 options.switch_to = argv[0];
1307 /* Is it a local branch? */
1309 strbuf_reset(&buf);
1310 strbuf_addf(&buf, "refs/heads/%s", branch_name);
1311 if (!read_ref(buf.buf, &options.orig_head))
1312 options.head_name = xstrdup(buf.buf);
1313 /* If not is it a valid ref (branch or commit)? */
1314 else if (!get_oid(branch_name, &options.orig_head))
1315 options.head_name = NULL;
1316 else
1317 die(_("fatal: no such branch/commit '%s'"),
1318 branch_name);
1319 } else if (argc == 0) {
1320 /* Do not need to switch branches, we are already on it. */
1321 options.head_name =
1322 xstrdup_or_null(resolve_ref_unsafe("HEAD", 0, NULL,
1323 &flags));
1324 if (!options.head_name)
1325 die(_("No such ref: %s"), "HEAD");
1326 if (flags & REF_ISSYMREF) {
1327 if (!skip_prefix(options.head_name,
1328 "refs/heads/", &branch_name))
1329 branch_name = options.head_name;
1330 } else {
1332 free(options.head_name);
1333 options.head_name = NULL;
1334 branch_name = "HEAD";
1335 }
1336 if (get_oid("HEAD", &options.orig_head))
1337 die(_("Could not resolve HEAD to a revision"));
1338 } else
1339 BUG("unexpected number of arguments left to parse");
1340 if (fork_point > 0) {
1342 struct commit *head =
1343 lookup_commit_reference(the_repository,
1344 &options.orig_head);
1345 options.restrict_revision =
1346 get_fork_point(options.upstream_name, head);
1347 }
1348 if (read_index(the_repository->index) < 0)
1350 die(_("could not read index"));
1351 if (options.autostash) {
1353 struct lock_file lock_file = LOCK_INIT;
1354 int fd;
1355 fd = hold_locked_index(&lock_file, 0);
1357 refresh_cache(REFRESH_QUIET);
1358 if (0 <= fd)
1359 update_index_if_able(&the_index, &lock_file);
1360 rollback_lock_file(&lock_file);
1361 if (has_unstaged_changes(1) || has_uncommitted_changes(1)) {
1363 const char *autostash =
1364 state_dir_path("autostash", &options);
1365 struct child_process stash = CHILD_PROCESS_INIT;
1366 struct object_id oid;
1367 struct commit *head =
1368 lookup_commit_reference(the_repository,
1369 &options.orig_head);
1370 argv_array_pushl(&stash.args,
1372 "stash", "create", "autostash", NULL);
1373 stash.git_cmd = 1;
1374 stash.no_stdin = 1;
1375 strbuf_reset(&buf);
1376 if (capture_command(&stash, &buf, GIT_MAX_HEXSZ))
1377 die(_("Cannot autostash"));
1378 strbuf_trim_trailing_newline(&buf);
1379 if (get_oid(buf.buf, &oid))
1380 die(_("Unexpected stash response: '%s'"),
1381 buf.buf);
1382 strbuf_reset(&buf);
1383 strbuf_add_unique_abbrev(&buf, &oid, DEFAULT_ABBREV);
1384 if (safe_create_leading_directories_const(autostash))
1386 die(_("Could not create directory for '%s'"),
1387 options.state_dir);
1388 write_file(autostash, "%s", oid_to_hex(&oid));
1389 printf(_("Created autostash: %s\n"), buf.buf);
1390 if (reset_head(&head->object.oid, "reset --hard",
1391 NULL, RESET_HEAD_HARD, NULL, NULL) < 0)
1392 die(_("could not reset --hard"));
1393 printf(_("HEAD is now at %s"),
1394 find_unique_abbrev(&head->object.oid,
1395 DEFAULT_ABBREV));
1396 strbuf_reset(&buf);
1397 pp_commit_easy(CMIT_FMT_ONELINE, head, &buf);
1398 if (buf.len > 0)
1399 printf(" %s", buf.buf);
1400 putchar('\n');
1401 if (discard_index(the_repository->index) < 0 ||
1403 read_index(the_repository->index) < 0)
1404 die(_("could not read index"));
1405 }
1406 }
1407 if (require_clean_work_tree("rebase",
1409 _("Please commit or stash them."), 1, 1)) {
1410 ret = 1;
1411 goto cleanup;
1412 }
1413 /*
1415 * Now we are rebasing commits upstream..orig_head (or with --root,
1416 * everything leading up to orig_head) on top of onto.
1417 */
1418 /*
1420 * Check if we are already based on onto with linear history,
1421 * but this should be done only when upstream and onto are the same
1422 * and if this is not an interactive rebase.
1423 */
1424 if (can_fast_forward(options.onto, &options.orig_head, &merge_base) &&
1425 !is_interactive(&options) && !options.restrict_revision &&
1426 options.upstream &&
1427 !oidcmp(&options.upstream->object.oid, &options.onto->object.oid)) {
1428 int flag;
1429 if (!(options.flags & REBASE_FORCE)) {
1431 /* Lazily switch to the target branch if needed... */
1432 if (options.switch_to) {
1433 struct object_id oid;
1434 if (get_oid(options.switch_to, &oid) < 0) {
1436 ret = !!error(_("could not parse '%s'"),
1437 options.switch_to);
1438 goto cleanup;
1439 }
1440 strbuf_reset(&buf);
1442 strbuf_addf(&buf, "rebase: checkout %s",
1443 options.switch_to);
1444 if (reset_head(&oid, "checkout",
1445 options.head_name, 0,
1446 NULL, NULL) < 0) {
1447 ret = !!error(_("could not switch to "
1448 "%s"),
1449 options.switch_to);
1450 goto cleanup;
1451 }
1452 }
1453 if (!(options.flags & REBASE_NO_QUIET))
1455 ; /* be quiet */
1456 else if (!strcmp(branch_name, "HEAD") &&
1457 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
1458 puts(_("HEAD is up to date."));
1459 else
1460 printf(_("Current branch %s is up to date.\n"),
1461 branch_name);
1462 ret = !!finish_rebase(&options);
1463 goto cleanup;
1464 } else if (!(options.flags & REBASE_NO_QUIET))
1465 ; /* be quiet */
1466 else if (!strcmp(branch_name, "HEAD") &&
1467 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
1468 puts(_("HEAD is up to date, rebase forced."));
1469 else
1470 printf(_("Current branch %s is up to date, rebase "
1471 "forced.\n"), branch_name);
1472 }
1473 /* If a hook exists, give it a chance to interrupt*/
1475 if (!ok_to_skip_pre_rebase &&
1476 run_hook_le(NULL, "pre-rebase", options.upstream_arg,
1477 argc ? argv[0] : NULL, NULL))
1478 die(_("The pre-rebase hook refused to rebase."));
1479 if (options.flags & REBASE_DIFFSTAT) {
1481 struct diff_options opts;
1482 if (options.flags & REBASE_VERBOSE)
1484 printf(_("Changes from %s to %s:\n"),
1485 oid_to_hex(&merge_base),
1486 oid_to_hex(&options.onto->object.oid));
1487 /* We want color (if set), but no pager */
1489 diff_setup(&opts);
1490 opts.stat_width = -1; /* use full terminal width */
1491 opts.stat_graph_width = -1; /* respect statGraphWidth config */
1492 opts.output_format |=
1493 DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
1494 opts.detect_rename = DIFF_DETECT_RENAME;
1495 diff_setup_done(&opts);
1496 diff_tree_oid(&merge_base, &options.onto->object.oid,
1497 "", &opts);
1498 diffcore_std(&opts);
1499 diff_flush(&opts);
1500 }
1501 if (is_interactive(&options))
1503 goto run_rebase;
1504 /* Detach HEAD and reset the tree */
1506 if (options.flags & REBASE_NO_QUIET)
1507 printf(_("First, rewinding head to replay your work on top of "
1508 "it...\n"));
1509 strbuf_addf(&msg, "rebase: checkout %s", options.onto_name);
1511 if (reset_head(&options.onto->object.oid, "checkout", NULL,
1512 RESET_HEAD_DETACH, NULL, msg.buf))
1513 die(_("Could not detach HEAD"));
1514 strbuf_release(&msg);
1515 /*
1517 * If the onto is a proper descendant of the tip of the branch, then
1518 * we just fast-forwarded.
1519 */
1520 strbuf_reset(&msg);
1521 if (!oidcmp(&merge_base, &options.orig_head)) {
1522 printf(_("Fast-forwarded %s to %s. \n"),
1523 branch_name, options.onto_name);
1524 strbuf_addf(&msg, "rebase finished: %s onto %s",
1525 options.head_name ? options.head_name : "detached HEAD",
1526 oid_to_hex(&options.onto->object.oid));
1527 reset_head(NULL, "Fast-forwarded", options.head_name, 0,
1528 "HEAD", msg.buf);
1529 strbuf_release(&msg);
1530 ret = !!finish_rebase(&options);
1531 goto cleanup;
1532 }
1533 strbuf_addf(&revisions, "%s..%s",
1535 options.root ? oid_to_hex(&options.onto->object.oid) :
1536 (options.restrict_revision ?
1537 oid_to_hex(&options.restrict_revision->object.oid) :
1538 oid_to_hex(&options.upstream->object.oid)),
1539 oid_to_hex(&options.orig_head));
1540 options.revisions = revisions.buf;
1542run_rebase:
1544 ret = !!run_specific_rebase(&options);
1545cleanup:
1547 strbuf_release(&revisions);
1548 free(options.head_name);
1549 free(options.gpg_sign_opt);
1550 free(options.cmd);
1551 free(squash_onto_name);
1552 return ret;
1553}