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"),
586 oid_to_hex(&head_oid));
587 goto leave_reset_head;
588 }
589 if (!fill_tree_descriptor(&desc[nr++], oid)) {
591 ret = error(_("failed to find tree of %s"), oid_to_hex(oid));
592 goto leave_reset_head;
593 }
594 if (unpack_trees(nr, desc, &unpack_tree_opts)) {
596 ret = -1;
597 goto leave_reset_head;
598 }
599 tree = parse_tree_indirect(oid);
601 prime_cache_tree(the_repository->index, tree);
602 if (write_locked_index(the_repository->index, &lock, COMMIT_LOCK) < 0) {
604 ret = error(_("could not write index"));
605 goto leave_reset_head;
606 }
607 reflog_action = getenv(GIT_REFLOG_ACTION_ENVIRONMENT);
609 strbuf_addf(&msg, "%s: ", reflog_action ? reflog_action : "rebase");
610 prefix_len = msg.len;
611 if (!get_oid("ORIG_HEAD", &oid_old_orig))
613 old_orig = &oid_old_orig;
614 if (!get_oid("HEAD", &oid_orig)) {
615 orig = &oid_orig;
616 if (!reflog_orig_head) {
617 strbuf_addstr(&msg, "updating ORIG_HEAD");
618 reflog_orig_head = msg.buf;
619 }
620 update_ref(reflog_orig_head, "ORIG_HEAD", orig, old_orig, 0,
621 UPDATE_REFS_MSG_ON_ERR);
622 } else if (old_orig)
623 delete_ref(NULL, "ORIG_HEAD", old_orig, 0);
624 if (!reflog_head) {
625 strbuf_setlen(&msg, prefix_len);
626 strbuf_addstr(&msg, "updating HEAD");
627 reflog_head = msg.buf;
628 }
629 if (!switch_to_branch)
630 ret = update_ref(reflog_head, "HEAD", oid, orig,
631 detach_head ? REF_NO_DEREF : 0,
632 UPDATE_REFS_MSG_ON_ERR);
633 else {
634 ret = create_symref("HEAD", switch_to_branch, msg.buf);
635 if (!ret)
636 ret = update_ref(reflog_head, "HEAD", oid, NULL, 0,
637 UPDATE_REFS_MSG_ON_ERR);
638 }
639leave_reset_head:
641 strbuf_release(&msg);
642 rollback_lock_file(&lock);
643 while (nr)
644 free((void *)desc[--nr].buffer);
645 return ret;
646}
647static int rebase_config(const char *var, const char *value, void *data)
649{
650 struct rebase_options *opts = data;
651 if (!strcmp(var, "rebase.stat")) {
653 if (git_config_bool(var, value))
654 opts->flags |= REBASE_DIFFSTAT;
655 else
656 opts->flags &= !REBASE_DIFFSTAT;
657 return 0;
658 }
659 if (!strcmp(var, "rebase.autosquash")) {
661 opts->autosquash = git_config_bool(var, value);
662 return 0;
663 }
664 if (!strcmp(var, "commit.gpgsign")) {
666 free(opts->gpg_sign_opt);
667 opts->gpg_sign_opt = git_config_bool(var, value) ?
668 xstrdup("-S") : NULL;
669 return 0;
670 }
671 if (!strcmp(var, "rebase.autostash")) {
673 opts->autostash = git_config_bool(var, value);
674 return 0;
675 }
676 return git_default_config(var, value, data);
678}
679/*
681 * Determines whether the commits in from..to are linear, i.e. contain
682 * no merge commits. This function *expects* `from` to be an ancestor of
683 * `to`.
684 */
685static int is_linear_history(struct commit *from, struct commit *to)
686{
687 while (to && to != from) {
688 parse_commit(to);
689 if (!to->parents)
690 return 1;
691 if (to->parents->next)
692 return 0;
693 to = to->parents->item;
694 }
695 return 1;
696}
697static int can_fast_forward(struct commit *onto, struct object_id *head_oid,
699 struct object_id *merge_base)
700{
701 struct commit *head = lookup_commit(the_repository, head_oid);
702 struct commit_list *merge_bases;
703 int res;
704 if (!head)
706 return 0;
707 merge_bases = get_merge_bases(onto, head);
709 if (merge_bases && !merge_bases->next) {
710 oidcpy(merge_base, &merge_bases->item->object.oid);
711 res = oideq(merge_base, &onto->object.oid);
712 } else {
713 oidcpy(merge_base, &null_oid);
714 res = 0;
715 }
716 free_commit_list(merge_bases);
717 return res && is_linear_history(onto, head);
718}
719/* -i followed by -m is still -i */
721static int parse_opt_merge(const struct option *opt, const char *arg, int unset)
722{
723 struct rebase_options *opts = opt->value;
724 BUG_ON_OPT_NEG(unset);
726 BUG_ON_OPT_ARG(arg);
727 if (!is_interactive(opts))
729 opts->type = REBASE_MERGE;
730 return 0;
732}
733/* -i followed by -p is still explicitly interactive, but -p alone is not */
735static int parse_opt_interactive(const struct option *opt, const char *arg,
736 int unset)
737{
738 struct rebase_options *opts = opt->value;
739 BUG_ON_OPT_NEG(unset);
741 BUG_ON_OPT_ARG(arg);
742 opts->type = REBASE_INTERACTIVE;
744 opts->flags |= REBASE_INTERACTIVE_EXPLICIT;
745 return 0;
747}
748static void NORETURN error_on_missing_default_upstream(void)
750{
751 struct branch *current_branch = branch_get(NULL);
752 printf(_("%s\n"
754 "Please specify which branch you want to rebase against.\n"
755 "See git-rebase(1) for details.\n"
756 "\n"
757 " git rebase '<branch>'\n"
758 "\n"),
759 current_branch ? _("There is no tracking information for "
760 "the current branch.") :
761 _("You are not currently on a branch."));
762 if (current_branch) {
764 const char *remote = current_branch->remote_name;
765 if (!remote)
767 remote = _("<remote>");
768 printf(_("If you wish to set tracking information for this "
770 "branch you can do so with:\n"
771 "\n"
772 " git branch --set-upstream-to=%s/<branch> %s\n"
773 "\n"),
774 remote, current_branch->name);
775 }
776 exit(1);
777}
778int cmd_rebase(int argc, const char **argv, const char *prefix)
780{
781 struct rebase_options options = {
782 .type = REBASE_UNSPECIFIED,
783 .flags = REBASE_NO_QUIET,
784 .git_am_opts = ARGV_ARRAY_INIT,
785 .allow_rerere_autoupdate = -1,
786 .allow_empty_message = 1,
787 .git_format_patch_opt = STRBUF_INIT,
788 };
789 const char *branch_name;
790 int ret, flags, total_argc, in_progress = 0;
791 int ok_to_skip_pre_rebase = 0;
792 struct strbuf msg = STRBUF_INIT;
793 struct strbuf revisions = STRBUF_INIT;
794 struct strbuf buf = STRBUF_INIT;
795 struct object_id merge_base;
796 enum {
797 NO_ACTION,
798 ACTION_CONTINUE,
799 ACTION_SKIP,
800 ACTION_ABORT,
801 ACTION_QUIT,
802 ACTION_EDIT_TODO,
803 ACTION_SHOW_CURRENT_PATCH,
804 } action = NO_ACTION;
805 const char *gpg_sign = NULL;
806 struct string_list exec = STRING_LIST_INIT_NODUP;
807 const char *rebase_merges = NULL;
808 int fork_point = -1;
809 struct string_list strategy_options = STRING_LIST_INIT_NODUP;
810 struct object_id squash_onto;
811 char *squash_onto_name = NULL;
812 struct option builtin_rebase_options[] = {
813 OPT_STRING(0, "onto", &options.onto_name,
814 N_("revision"),
815 N_("rebase onto given branch instead of upstream")),
816 OPT_BOOL(0, "no-verify", &ok_to_skip_pre_rebase,
817 N_("allow pre-rebase hook to run")),
818 OPT_NEGBIT('q', "quiet", &options.flags,
819 N_("be quiet. implies --no-stat"),
820 REBASE_NO_QUIET| REBASE_VERBOSE | REBASE_DIFFSTAT),
821 OPT_BIT('v', "verbose", &options.flags,
822 N_("display a diffstat of what changed upstream"),
823 REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT),
824 {OPTION_NEGBIT, 'n', "no-stat", &options.flags, NULL,
825 N_("do not show diffstat of what changed upstream"),
826 PARSE_OPT_NOARG, NULL, REBASE_DIFFSTAT },
827 OPT_BOOL(0, "signoff", &options.signoff,
828 N_("add a Signed-off-by: line to each commit")),
829 OPT_PASSTHRU_ARGV(0, "ignore-whitespace", &options.git_am_opts,
830 NULL, N_("passed to 'git am'"),
831 PARSE_OPT_NOARG),
832 OPT_PASSTHRU_ARGV(0, "committer-date-is-author-date",
833 &options.git_am_opts, NULL,
834 N_("passed to 'git am'"), PARSE_OPT_NOARG),
835 OPT_PASSTHRU_ARGV(0, "ignore-date", &options.git_am_opts, NULL,
836 N_("passed to 'git am'"), PARSE_OPT_NOARG),
837 OPT_PASSTHRU_ARGV('C', NULL, &options.git_am_opts, N_("n"),
838 N_("passed to 'git apply'"), 0),
839 OPT_PASSTHRU_ARGV(0, "whitespace", &options.git_am_opts,
840 N_("action"), N_("passed to 'git apply'"), 0),
841 OPT_BIT('f', "force-rebase", &options.flags,
842 N_("cherry-pick all commits, even if unchanged"),
843 REBASE_FORCE),
844 OPT_BIT(0, "no-ff", &options.flags,
845 N_("cherry-pick all commits, even if unchanged"),
846 REBASE_FORCE),
847 OPT_CMDMODE(0, "continue", &action, N_("continue"),
848 ACTION_CONTINUE),
849 OPT_CMDMODE(0, "skip", &action,
850 N_("skip current patch and continue"), ACTION_SKIP),
851 OPT_CMDMODE(0, "abort", &action,
852 N_("abort and check out the original branch"),
853 ACTION_ABORT),
854 OPT_CMDMODE(0, "quit", &action,
855 N_("abort but keep HEAD where it is"), ACTION_QUIT),
856 OPT_CMDMODE(0, "edit-todo", &action, N_("edit the todo list "
857 "during an interactive rebase"), ACTION_EDIT_TODO),
858 OPT_CMDMODE(0, "show-current-patch", &action,
859 N_("show the patch file being applied or merged"),
860 ACTION_SHOW_CURRENT_PATCH),
861 { OPTION_CALLBACK, 'm', "merge", &options, NULL,
862 N_("use merging strategies to rebase"),
863 PARSE_OPT_NOARG | PARSE_OPT_NONEG,
864 parse_opt_merge },
865 { OPTION_CALLBACK, 'i', "interactive", &options, NULL,
866 N_("let the user edit the list of commits to rebase"),
867 PARSE_OPT_NOARG | PARSE_OPT_NONEG,
868 parse_opt_interactive },
869 OPT_SET_INT('p', "preserve-merges", &options.type,
870 N_("try to recreate merges instead of ignoring "
871 "them"), REBASE_PRESERVE_MERGES),
872 OPT_BOOL(0, "rerere-autoupdate",
873 &options.allow_rerere_autoupdate,
874 N_("allow rerere to update index with resolved "
875 "conflict")),
876 OPT_BOOL('k', "keep-empty", &options.keep_empty,
877 N_("preserve empty commits during rebase")),
878 OPT_BOOL(0, "autosquash", &options.autosquash,
879 N_("move commits that begin with "
880 "squash!/fixup! under -i")),
881 { OPTION_STRING, 'S', "gpg-sign", &gpg_sign, N_("key-id"),
882 N_("GPG-sign commits"),
883 PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
884 OPT_BOOL(0, "autostash", &options.autostash,
885 N_("automatically stash/stash pop before and after")),
886 OPT_STRING_LIST('x', "exec", &exec, N_("exec"),
887 N_("add exec lines after each commit of the "
888 "editable list")),
889 OPT_BOOL(0, "allow-empty-message",
890 &options.allow_empty_message,
891 N_("allow rebasing commits with empty messages")),
892 {OPTION_STRING, 'r', "rebase-merges", &rebase_merges,
893 N_("mode"),
894 N_("try to rebase merges instead of skipping them"),
895 PARSE_OPT_OPTARG, NULL, (intptr_t)""},
896 OPT_BOOL(0, "fork-point", &fork_point,
897 N_("use 'merge-base --fork-point' to refine upstream")),
898 OPT_STRING('s', "strategy", &options.strategy,
899 N_("strategy"), N_("use the given merge strategy")),
900 OPT_STRING_LIST('X', "strategy-option", &strategy_options,
901 N_("option"),
902 N_("pass the argument through to the merge "
903 "strategy")),
904 OPT_BOOL(0, "root", &options.root,
905 N_("rebase all reachable commits up to the root(s)")),
906 OPT_END(),
907 };
908 int i;
909 /*
911 * NEEDSWORK: Once the builtin rebase has been tested enough
912 * and git-legacy-rebase.sh is retired to contrib/, this preamble
913 * can be removed.
914 */
915 if (!use_builtin_rebase()) {
917 const char *path = mkpath("%s/git-legacy-rebase",
918 git_exec_path());
919 if (sane_execvp(path, (char **)argv) < 0)
921 die_errno(_("could not exec %s"), path);
922 else
923 BUG("sane_execvp() returned???");
924 }
925 if (argc == 2 && !strcmp(argv[1], "-h"))
927 usage_with_options(builtin_rebase_usage,
928 builtin_rebase_options);
929 prefix = setup_git_directory();
931 trace_repo_setup(prefix);
932 setup_work_tree();
933 git_config(rebase_config, &options);
935 strbuf_reset(&buf);
937 strbuf_addf(&buf, "%s/applying", apply_dir());
938 if(file_exists(buf.buf))
939 die(_("It looks like 'git am' is in progress. Cannot rebase."));
940 if (is_directory(apply_dir())) {
942 options.type = REBASE_AM;
943 options.state_dir = apply_dir();
944 } else if (is_directory(merge_dir())) {
945 strbuf_reset(&buf);
946 strbuf_addf(&buf, "%s/rewritten", merge_dir());
947 if (is_directory(buf.buf)) {
948 options.type = REBASE_PRESERVE_MERGES;
949 options.flags |= REBASE_INTERACTIVE_EXPLICIT;
950 } else {
951 strbuf_reset(&buf);
952 strbuf_addf(&buf, "%s/interactive", merge_dir());
953 if(file_exists(buf.buf)) {
954 options.type = REBASE_INTERACTIVE;
955 options.flags |= REBASE_INTERACTIVE_EXPLICIT;
956 } else
957 options.type = REBASE_MERGE;
958 }
959 options.state_dir = merge_dir();
960 }
961 if (options.type != REBASE_UNSPECIFIED)
963 in_progress = 1;
964 total_argc = argc;
966 argc = parse_options(argc, argv, prefix,
967 builtin_rebase_options,
968 builtin_rebase_usage, 0);
969 if (action != NO_ACTION && total_argc != 2) {
971 usage_with_options(builtin_rebase_usage,
972 builtin_rebase_options);
973 }
974 if (argc > 2)
976 usage_with_options(builtin_rebase_usage,
977 builtin_rebase_options);
978 if (action != NO_ACTION && !in_progress)
980 die(_("No rebase in progress?"));
981 if (action == ACTION_EDIT_TODO && !is_interactive(&options))
983 die(_("The --edit-todo action can only be used during "
984 "interactive rebase."));
985 switch (action) {
987 case ACTION_CONTINUE: {
988 struct object_id head;
989 struct lock_file lock_file = LOCK_INIT;
990 int fd;
991 options.action = "continue";
993 /* Sanity check */
995 if (get_oid("HEAD", &head))
996 die(_("Cannot read HEAD"));
997 fd = hold_locked_index(&lock_file, 0);
999 if (read_index(the_repository->index) < 0)
1000 die(_("could not read index"));
1001 refresh_index(the_repository->index, REFRESH_QUIET, NULL, NULL,
1002 NULL);
1003 if (0 <= fd)
1004 update_index_if_able(the_repository->index,
1005 &lock_file);
1006 rollback_lock_file(&lock_file);
1007 if (has_unstaged_changes(1)) {
1009 puts(_("You must edit all merge conflicts and then\n"
1010 "mark them as resolved using git add"));
1011 exit(1);
1012 }
1013 if (read_basic_state(&options))
1014 exit(1);
1015 goto run_rebase;
1016 }
1017 case ACTION_SKIP: {
1018 struct string_list merge_rr = STRING_LIST_INIT_DUP;
1019 options.action = "skip";
1021 rerere_clear(&merge_rr);
1023 string_list_clear(&merge_rr, 1);
1024 if (reset_head(NULL, "reset", NULL, RESET_HEAD_HARD,
1026 NULL, NULL) < 0)
1027 die(_("could not discard worktree changes"));
1028 remove_branch_state();
1029 if (read_basic_state(&options))
1030 exit(1);
1031 goto run_rebase;
1032 }
1033 case ACTION_ABORT: {
1034 struct string_list merge_rr = STRING_LIST_INIT_DUP;
1035 options.action = "abort";
1036 rerere_clear(&merge_rr);
1038 string_list_clear(&merge_rr, 1);
1039 if (read_basic_state(&options))
1041 exit(1);
1042 if (reset_head(&options.orig_head, "reset",
1043 options.head_name, RESET_HEAD_HARD,
1044 NULL, NULL) < 0)
1045 die(_("could not move back to %s"),
1046 oid_to_hex(&options.orig_head));
1047 remove_branch_state();
1048 ret = finish_rebase(&options);
1049 goto cleanup;
1050 }
1051 case ACTION_QUIT: {
1052 strbuf_reset(&buf);
1053 strbuf_addstr(&buf, options.state_dir);
1054 ret = !!remove_dir_recursively(&buf, 0);
1055 if (ret)
1056 die(_("could not remove '%s'"), options.state_dir);
1057 goto cleanup;
1058 }
1059 case ACTION_EDIT_TODO:
1060 options.action = "edit-todo";
1061 options.dont_finish_rebase = 1;
1062 goto run_rebase;
1063 case ACTION_SHOW_CURRENT_PATCH:
1064 options.action = "show-current-patch";
1065 options.dont_finish_rebase = 1;
1066 goto run_rebase;
1067 case NO_ACTION:
1068 break;
1069 default:
1070 BUG("action: %d", action);
1071 }
1072 /* Make sure no rebase is in progress */
1074 if (in_progress) {
1075 const char *last_slash = strrchr(options.state_dir, '/');
1076 const char *state_dir_base =
1077 last_slash ? last_slash + 1 : options.state_dir;
1078 const char *cmd_live_rebase =
1079 "git rebase (--continue | --abort | --skip)";
1080 strbuf_reset(&buf);
1081 strbuf_addf(&buf, "rm -fr \"%s\"", options.state_dir);
1082 die(_("It seems that there is already a %s directory, and\n"
1083 "I wonder if you are in the middle of another rebase. "
1084 "If that is the\n"
1085 "case, please try\n\t%s\n"
1086 "If that is not the case, please\n\t%s\n"
1087 "and run me again. I am stopping in case you still "
1088 "have something\n"
1089 "valuable there.\n"),
1090 state_dir_base, cmd_live_rebase, buf.buf);
1091 }
1092 for (i = 0; i < options.git_am_opts.argc; i++) {
1094 const char *option = options.git_am_opts.argv[i], *p;
1095 if (!strcmp(option, "--committer-date-is-author-date") ||
1096 !strcmp(option, "--ignore-date") ||
1097 !strcmp(option, "--whitespace=fix") ||
1098 !strcmp(option, "--whitespace=strip"))
1099 options.flags |= REBASE_FORCE;
1100 else if (skip_prefix(option, "-C", &p)) {
1101 while (*p)
1102 if (!isdigit(*(p++)))
1103 die(_("switch `C' expects a "
1104 "numerical value"));
1105 } else if (skip_prefix(option, "--whitespace=", &p)) {
1106 if (*p && strcmp(p, "warn") && strcmp(p, "nowarn") &&
1107 strcmp(p, "error") && strcmp(p, "error-all"))
1108 die("Invalid whitespace option: '%s'", p);
1109 }
1110 }
1111 if (!(options.flags & REBASE_NO_QUIET))
1113 argv_array_push(&options.git_am_opts, "-q");
1114 if (options.keep_empty)
1116 imply_interactive(&options, "--keep-empty");
1117 if (gpg_sign) {
1119 free(options.gpg_sign_opt);
1120 options.gpg_sign_opt = xstrfmt("-S%s", gpg_sign);
1121 }
1122 if (exec.nr) {
1124 int i;
1125 imply_interactive(&options, "--exec");
1127 strbuf_reset(&buf);
1129 for (i = 0; i < exec.nr; i++)
1130 strbuf_addf(&buf, "exec %s\n", exec.items[i].string);
1131 options.cmd = xstrdup(buf.buf);
1132 }
1133 if (rebase_merges) {
1135 if (!*rebase_merges)
1136 ; /* default mode; do nothing */
1137 else if (!strcmp("rebase-cousins", rebase_merges))
1138 options.rebase_cousins = 1;
1139 else if (strcmp("no-rebase-cousins", rebase_merges))
1140 die(_("Unknown mode: %s"), rebase_merges);
1141 options.rebase_merges = 1;
1142 imply_interactive(&options, "--rebase-merges");
1143 }
1144 if (strategy_options.nr) {
1146 int i;
1147 if (!options.strategy)
1149 options.strategy = "recursive";
1150 strbuf_reset(&buf);
1152 for (i = 0; i < strategy_options.nr; i++)
1153 strbuf_addf(&buf, " --%s",
1154 strategy_options.items[i].string);
1155 options.strategy_opts = xstrdup(buf.buf);
1156 }
1157 if (options.strategy) {
1159 options.strategy = xstrdup(options.strategy);
1160 switch (options.type) {
1161 case REBASE_AM:
1162 die(_("--strategy requires --merge or --interactive"));
1163 case REBASE_MERGE:
1164 case REBASE_INTERACTIVE:
1165 case REBASE_PRESERVE_MERGES:
1166 /* compatible */
1167 break;
1168 case REBASE_UNSPECIFIED:
1169 options.type = REBASE_MERGE;
1170 break;
1171 default:
1172 BUG("unhandled rebase type (%d)", options.type);
1173 }
1174 }
1175 if (options.root && !options.onto_name)
1177 imply_interactive(&options, "--root without --onto");
1178 if (isatty(2) && options.flags & REBASE_NO_QUIET)
1180 strbuf_addstr(&options.git_format_patch_opt, " --progress");
1181 switch (options.type) {
1183 case REBASE_MERGE:
1184 case REBASE_INTERACTIVE:
1185 case REBASE_PRESERVE_MERGES:
1186 options.state_dir = merge_dir();
1187 break;
1188 case REBASE_AM:
1189 options.state_dir = apply_dir();
1190 break;
1191 default:
1192 /* the default rebase backend is `--am` */
1193 options.type = REBASE_AM;
1194 options.state_dir = apply_dir();
1195 break;
1196 }
1197 if (options.git_am_opts.argc) {
1199 /* all am options except -q are compatible only with --am */
1200 for (i = options.git_am_opts.argc - 1; i >= 0; i--)
1201 if (strcmp(options.git_am_opts.argv[i], "-q"))
1202 break;
1203 if (is_interactive(&options) && i >= 0)
1205 die(_("error: cannot combine interactive options "
1206 "(--interactive, --exec, --rebase-merges, "
1207 "--preserve-merges, --keep-empty, --root + "
1208 "--onto) with am options (%s)"), buf.buf);
1209 if (options.type == REBASE_MERGE && i >= 0)
1210 die(_("error: cannot combine merge options (--merge, "
1211 "--strategy, --strategy-option) with am options "
1212 "(%s)"), buf.buf);
1213 }
1214 if (options.signoff) {
1216 if (options.type == REBASE_PRESERVE_MERGES)
1217 die("cannot combine '--signoff' with "
1218 "'--preserve-merges'");
1219 argv_array_push(&options.git_am_opts, "--signoff");
1220 options.flags |= REBASE_FORCE;
1221 }
1222 if (options.type == REBASE_PRESERVE_MERGES)
1224 /*
1225 * Note: incompatibility with --signoff handled in signoff block above
1226 * Note: incompatibility with --interactive is just a strong warning;
1227 * git-rebase.txt caveats with "unless you know what you are doing"
1228 */
1229 if (options.rebase_merges)
1230 die(_("error: cannot combine '--preserve-merges' with "
1231 "'--rebase-merges'"));
1232 if (options.rebase_merges) {
1234 if (strategy_options.nr)
1235 die(_("error: cannot combine '--rebase-merges' with "
1236 "'--strategy-option'"));
1237 if (options.strategy)
1238 die(_("error: cannot combine '--rebase-merges' with "
1239 "'--strategy'"));
1240 }
1241 if (!options.root) {
1243 if (argc < 1) {
1244 struct branch *branch;
1245 branch = branch_get(NULL);
1247 options.upstream_name = branch_get_upstream(branch,
1248 NULL);
1249 if (!options.upstream_name)
1250 error_on_missing_default_upstream();
1251 if (fork_point < 0)
1252 fork_point = 1;
1253 } else {
1254 options.upstream_name = argv[0];
1255 argc--;
1256 argv++;
1257 if (!strcmp(options.upstream_name, "-"))
1258 options.upstream_name = "@{-1}";
1259 }
1260 options.upstream = peel_committish(options.upstream_name);
1261 if (!options.upstream)
1262 die(_("invalid upstream '%s'"), options.upstream_name);
1263 options.upstream_arg = options.upstream_name;
1264 } else {
1265 if (!options.onto_name) {
1266 if (commit_tree("", 0, the_hash_algo->empty_tree, NULL,
1267 &squash_onto, NULL, NULL) < 0)
1268 die(_("Could not create new root commit"));
1269 options.squash_onto = &squash_onto;
1270 options.onto_name = squash_onto_name =
1271 xstrdup(oid_to_hex(&squash_onto));
1272 }
1273 options.upstream_name = NULL;
1274 options.upstream = NULL;
1275 if (argc > 1)
1276 usage_with_options(builtin_rebase_usage,
1277 builtin_rebase_options);
1278 options.upstream_arg = "--root";
1279 }
1280 /* Make sure the branch to rebase onto is valid. */
1282 if (!options.onto_name)
1283 options.onto_name = options.upstream_name;
1284 if (strstr(options.onto_name, "...")) {
1285 if (get_oid_mb(options.onto_name, &merge_base) < 0)
1286 die(_("'%s': need exactly one merge base"),
1287 options.onto_name);
1288 options.onto = lookup_commit_or_die(&merge_base,
1289 options.onto_name);
1290 } else {
1291 options.onto = peel_committish(options.onto_name);
1292 if (!options.onto)
1293 die(_("Does not point to a valid commit '%s'"),
1294 options.onto_name);
1295 }
1296 /*
1298 * If the branch to rebase is given, that is the branch we will rebase
1299 * branch_name -- branch/commit being rebased, or
1300 * HEAD (already detached)
1301 * orig_head -- commit object name of tip of the branch before rebasing
1302 * head_name -- refs/heads/<that-branch> or NULL (detached HEAD)
1303 */
1304 if (argc == 1) {
1305 /* Is it "rebase other branchname" or "rebase other commit"? */
1306 branch_name = argv[0];
1307 options.switch_to = argv[0];
1308 /* Is it a local branch? */
1310 strbuf_reset(&buf);
1311 strbuf_addf(&buf, "refs/heads/%s", branch_name);
1312 if (!read_ref(buf.buf, &options.orig_head))
1313 options.head_name = xstrdup(buf.buf);
1314 /* If not is it a valid ref (branch or commit)? */
1315 else if (!get_oid(branch_name, &options.orig_head))
1316 options.head_name = NULL;
1317 else
1318 die(_("fatal: no such branch/commit '%s'"),
1319 branch_name);
1320 } else if (argc == 0) {
1321 /* Do not need to switch branches, we are already on it. */
1322 options.head_name =
1323 xstrdup_or_null(resolve_ref_unsafe("HEAD", 0, NULL,
1324 &flags));
1325 if (!options.head_name)
1326 die(_("No such ref: %s"), "HEAD");
1327 if (flags & REF_ISSYMREF) {
1328 if (!skip_prefix(options.head_name,
1329 "refs/heads/", &branch_name))
1330 branch_name = options.head_name;
1331 } else {
1333 free(options.head_name);
1334 options.head_name = NULL;
1335 branch_name = "HEAD";
1336 }
1337 if (get_oid("HEAD", &options.orig_head))
1338 die(_("Could not resolve HEAD to a revision"));
1339 } else
1340 BUG("unexpected number of arguments left to parse");
1341 if (fork_point > 0) {
1343 struct commit *head =
1344 lookup_commit_reference(the_repository,
1345 &options.orig_head);
1346 options.restrict_revision =
1347 get_fork_point(options.upstream_name, head);
1348 }
1349 if (read_index(the_repository->index) < 0)
1351 die(_("could not read index"));
1352 if (options.autostash) {
1354 struct lock_file lock_file = LOCK_INIT;
1355 int fd;
1356 fd = hold_locked_index(&lock_file, 0);
1358 refresh_cache(REFRESH_QUIET);
1359 if (0 <= fd)
1360 update_index_if_able(&the_index, &lock_file);
1361 rollback_lock_file(&lock_file);
1362 if (has_unstaged_changes(1) || has_uncommitted_changes(1)) {
1364 const char *autostash =
1365 state_dir_path("autostash", &options);
1366 struct child_process stash = CHILD_PROCESS_INIT;
1367 struct object_id oid;
1368 struct commit *head =
1369 lookup_commit_reference(the_repository,
1370 &options.orig_head);
1371 argv_array_pushl(&stash.args,
1373 "stash", "create", "autostash", NULL);
1374 stash.git_cmd = 1;
1375 stash.no_stdin = 1;
1376 strbuf_reset(&buf);
1377 if (capture_command(&stash, &buf, GIT_MAX_HEXSZ))
1378 die(_("Cannot autostash"));
1379 strbuf_trim_trailing_newline(&buf);
1380 if (get_oid(buf.buf, &oid))
1381 die(_("Unexpected stash response: '%s'"),
1382 buf.buf);
1383 strbuf_reset(&buf);
1384 strbuf_add_unique_abbrev(&buf, &oid, DEFAULT_ABBREV);
1385 if (safe_create_leading_directories_const(autostash))
1387 die(_("Could not create directory for '%s'"),
1388 options.state_dir);
1389 write_file(autostash, "%s", oid_to_hex(&oid));
1390 printf(_("Created autostash: %s\n"), buf.buf);
1391 if (reset_head(&head->object.oid, "reset --hard",
1392 NULL, RESET_HEAD_HARD, NULL, NULL) < 0)
1393 die(_("could not reset --hard"));
1394 printf(_("HEAD is now at %s"),
1395 find_unique_abbrev(&head->object.oid,
1396 DEFAULT_ABBREV));
1397 strbuf_reset(&buf);
1398 pp_commit_easy(CMIT_FMT_ONELINE, head, &buf);
1399 if (buf.len > 0)
1400 printf(" %s", buf.buf);
1401 putchar('\n');
1402 if (discard_index(the_repository->index) < 0 ||
1404 read_index(the_repository->index) < 0)
1405 die(_("could not read index"));
1406 }
1407 }
1408 if (require_clean_work_tree("rebase",
1410 _("Please commit or stash them."), 1, 1)) {
1411 ret = 1;
1412 goto cleanup;
1413 }
1414 /*
1416 * Now we are rebasing commits upstream..orig_head (or with --root,
1417 * everything leading up to orig_head) on top of onto.
1418 */
1419 /*
1421 * Check if we are already based on onto with linear history,
1422 * but this should be done only when upstream and onto are the same
1423 * and if this is not an interactive rebase.
1424 */
1425 if (can_fast_forward(options.onto, &options.orig_head, &merge_base) &&
1426 !is_interactive(&options) && !options.restrict_revision &&
1427 options.upstream &&
1428 !oidcmp(&options.upstream->object.oid, &options.onto->object.oid)) {
1429 int flag;
1430 if (!(options.flags & REBASE_FORCE)) {
1432 /* Lazily switch to the target branch if needed... */
1433 if (options.switch_to) {
1434 struct object_id oid;
1435 if (get_oid(options.switch_to, &oid) < 0) {
1437 ret = !!error(_("could not parse '%s'"),
1438 options.switch_to);
1439 goto cleanup;
1440 }
1441 strbuf_reset(&buf);
1443 strbuf_addf(&buf, "rebase: checkout %s",
1444 options.switch_to);
1445 if (reset_head(&oid, "checkout",
1446 options.head_name, 0,
1447 NULL, NULL) < 0) {
1448 ret = !!error(_("could not switch to "
1449 "%s"),
1450 options.switch_to);
1451 goto cleanup;
1452 }
1453 }
1454 if (!(options.flags & REBASE_NO_QUIET))
1456 ; /* be quiet */
1457 else if (!strcmp(branch_name, "HEAD") &&
1458 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
1459 puts(_("HEAD is up to date."));
1460 else
1461 printf(_("Current branch %s is up to date.\n"),
1462 branch_name);
1463 ret = !!finish_rebase(&options);
1464 goto cleanup;
1465 } else if (!(options.flags & REBASE_NO_QUIET))
1466 ; /* be quiet */
1467 else if (!strcmp(branch_name, "HEAD") &&
1468 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
1469 puts(_("HEAD is up to date, rebase forced."));
1470 else
1471 printf(_("Current branch %s is up to date, rebase "
1472 "forced.\n"), branch_name);
1473 }
1474 /* If a hook exists, give it a chance to interrupt*/
1476 if (!ok_to_skip_pre_rebase &&
1477 run_hook_le(NULL, "pre-rebase", options.upstream_arg,
1478 argc ? argv[0] : NULL, NULL))
1479 die(_("The pre-rebase hook refused to rebase."));
1480 if (options.flags & REBASE_DIFFSTAT) {
1482 struct diff_options opts;
1483 if (options.flags & REBASE_VERBOSE)
1485 printf(_("Changes from %s to %s:\n"),
1486 oid_to_hex(&merge_base),
1487 oid_to_hex(&options.onto->object.oid));
1488 /* We want color (if set), but no pager */
1490 diff_setup(&opts);
1491 opts.stat_width = -1; /* use full terminal width */
1492 opts.stat_graph_width = -1; /* respect statGraphWidth config */
1493 opts.output_format |=
1494 DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
1495 opts.detect_rename = DIFF_DETECT_RENAME;
1496 diff_setup_done(&opts);
1497 diff_tree_oid(&merge_base, &options.onto->object.oid,
1498 "", &opts);
1499 diffcore_std(&opts);
1500 diff_flush(&opts);
1501 }
1502 if (is_interactive(&options))
1504 goto run_rebase;
1505 /* Detach HEAD and reset the tree */
1507 if (options.flags & REBASE_NO_QUIET)
1508 printf(_("First, rewinding head to replay your work on top of "
1509 "it...\n"));
1510 strbuf_addf(&msg, "rebase: checkout %s", options.onto_name);
1512 if (reset_head(&options.onto->object.oid, "checkout", NULL,
1513 RESET_HEAD_DETACH, NULL, msg.buf))
1514 die(_("Could not detach HEAD"));
1515 strbuf_release(&msg);
1516 /*
1518 * If the onto is a proper descendant of the tip of the branch, then
1519 * we just fast-forwarded.
1520 */
1521 strbuf_reset(&msg);
1522 if (!oidcmp(&merge_base, &options.orig_head)) {
1523 printf(_("Fast-forwarded %s to %s. \n"),
1524 branch_name, options.onto_name);
1525 strbuf_addf(&msg, "rebase finished: %s onto %s",
1526 options.head_name ? options.head_name : "detached HEAD",
1527 oid_to_hex(&options.onto->object.oid));
1528 reset_head(NULL, "Fast-forwarded", options.head_name, 0,
1529 "HEAD", msg.buf);
1530 strbuf_release(&msg);
1531 ret = !!finish_rebase(&options);
1532 goto cleanup;
1533 }
1534 strbuf_addf(&revisions, "%s..%s",
1536 options.root ? oid_to_hex(&options.onto->object.oid) :
1537 (options.restrict_revision ?
1538 oid_to_hex(&options.restrict_revision->object.oid) :
1539 oid_to_hex(&options.upstream->object.oid)),
1540 oid_to_hex(&options.orig_head));
1541 options.revisions = revisions.buf;
1543run_rebase:
1545 ret = !!run_specific_rebase(&options);
1546cleanup:
1548 strbuf_release(&revisions);
1549 free(options.head_name);
1550 free(options.gpg_sign_opt);
1551 free(options.cmd);
1552 free(squash_onto_name);
1553 return ret;
1554}