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 int reschedule_failed_exec;
108};
109static int is_interactive(struct rebase_options *opts)
111{
112 return opts->type == REBASE_INTERACTIVE ||
113 opts->type == REBASE_PRESERVE_MERGES;
114}
115static void imply_interactive(struct rebase_options *opts, const char *option)
117{
118 switch (opts->type) {
119 case REBASE_AM:
120 die(_("%s requires an interactive rebase"), option);
121 break;
122 case REBASE_INTERACTIVE:
123 case REBASE_PRESERVE_MERGES:
124 break;
125 case REBASE_MERGE:
126 /* we now implement --merge via --interactive */
127 default:
128 opts->type = REBASE_INTERACTIVE; /* implied */
129 break;
130 }
131}
132/* Returns the filename prefixed by the state_dir */
134static const char *state_dir_path(const char *filename, struct rebase_options *opts)
135{
136 static struct strbuf path = STRBUF_INIT;
137 static size_t prefix_len;
138 if (!prefix_len) {
140 strbuf_addf(&path, "%s/", opts->state_dir);
141 prefix_len = path.len;
142 }
143 strbuf_setlen(&path, prefix_len);
145 strbuf_addstr(&path, filename);
146 return path.buf;
147}
148/* Read one file, then strip line endings */
150static int read_one(const char *path, struct strbuf *buf)
151{
152 if (strbuf_read_file(buf, path, 0) < 0)
153 return error_errno(_("could not read '%s'"), path);
154 strbuf_trim_trailing_newline(buf);
155 return 0;
156}
157/* Initialize the rebase options from the state directory. */
159static int read_basic_state(struct rebase_options *opts)
160{
161 struct strbuf head_name = STRBUF_INIT;
162 struct strbuf buf = STRBUF_INIT;
163 struct object_id oid;
164 if (read_one(state_dir_path("head-name", opts), &head_name) ||
166 read_one(state_dir_path("onto", opts), &buf))
167 return -1;
168 opts->head_name = starts_with(head_name.buf, "refs/") ?
169 xstrdup(head_name.buf) : NULL;
170 strbuf_release(&head_name);
171 if (get_oid(buf.buf, &oid))
172 return error(_("could not get 'onto': '%s'"), buf.buf);
173 opts->onto = lookup_commit_or_die(&oid, buf.buf);
174 /*
176 * We always write to orig-head, but interactive rebase used to write to
177 * head. Fall back to reading from head to cover for the case that the
178 * user upgraded git with an ongoing interactive rebase.
179 */
180 strbuf_reset(&buf);
181 if (file_exists(state_dir_path("orig-head", opts))) {
182 if (read_one(state_dir_path("orig-head", opts), &buf))
183 return -1;
184 } else if (read_one(state_dir_path("head", opts), &buf))
185 return -1;
186 if (get_oid(buf.buf, &opts->orig_head))
187 return error(_("invalid orig-head: '%s'"), buf.buf);
188 if (file_exists(state_dir_path("quiet", opts)))
190 opts->flags &= ~REBASE_NO_QUIET;
191 else
192 opts->flags |= REBASE_NO_QUIET;
193 if (file_exists(state_dir_path("verbose", opts)))
195 opts->flags |= REBASE_VERBOSE;
196 if (file_exists(state_dir_path("signoff", opts))) {
198 opts->signoff = 1;
199 opts->flags |= REBASE_FORCE;
200 }
201 if (file_exists(state_dir_path("allow_rerere_autoupdate", opts))) {
203 strbuf_reset(&buf);
204 if (read_one(state_dir_path("allow_rerere_autoupdate", opts),
205 &buf))
206 return -1;
207 if (!strcmp(buf.buf, "--rerere-autoupdate"))
208 opts->allow_rerere_autoupdate = 1;
209 else if (!strcmp(buf.buf, "--no-rerere-autoupdate"))
210 opts->allow_rerere_autoupdate = 0;
211 else
212 warning(_("ignoring invalid allow_rerere_autoupdate: "
213 "'%s'"), buf.buf);
214 } else
215 opts->allow_rerere_autoupdate = -1;
216 if (file_exists(state_dir_path("gpg_sign_opt", opts))) {
218 strbuf_reset(&buf);
219 if (read_one(state_dir_path("gpg_sign_opt", opts),
220 &buf))
221 return -1;
222 free(opts->gpg_sign_opt);
223 opts->gpg_sign_opt = xstrdup(buf.buf);
224 }
225 if (file_exists(state_dir_path("strategy", opts))) {
227 strbuf_reset(&buf);
228 if (read_one(state_dir_path("strategy", opts), &buf))
229 return -1;
230 free(opts->strategy);
231 opts->strategy = xstrdup(buf.buf);
232 }
233 if (file_exists(state_dir_path("strategy_opts", opts))) {
235 strbuf_reset(&buf);
236 if (read_one(state_dir_path("strategy_opts", opts), &buf))
237 return -1;
238 free(opts->strategy_opts);
239 opts->strategy_opts = xstrdup(buf.buf);
240 }
241 strbuf_release(&buf);
243 return 0;
245}
246static int apply_autostash(struct rebase_options *opts)
248{
249 const char *path = state_dir_path("autostash", opts);
250 struct strbuf autostash = STRBUF_INIT;
251 struct child_process stash_apply = CHILD_PROCESS_INIT;
252 if (!file_exists(path))
254 return 0;
255 if (read_one(path, &autostash))
257 return error(_("Could not read '%s'"), path);
258 /* Ensure that the hash is not mistaken for a number */
259 strbuf_addstr(&autostash, "^0");
260 argv_array_pushl(&stash_apply.args,
261 "stash", "apply", autostash.buf, NULL);
262 stash_apply.git_cmd = 1;
263 stash_apply.no_stderr = stash_apply.no_stdout =
264 stash_apply.no_stdin = 1;
265 if (!run_command(&stash_apply))
266 printf(_("Applied autostash.\n"));
267 else {
268 struct argv_array args = ARGV_ARRAY_INIT;
269 int res = 0;
270 argv_array_pushl(&args,
272 "stash", "store", "-m", "autostash", "-q",
273 autostash.buf, NULL);
274 if (run_command_v_opt(args.argv, RUN_GIT_CMD))
275 res = error(_("Cannot store %s"), autostash.buf);
276 argv_array_clear(&args);
277 strbuf_release(&autostash);
278 if (res)
279 return res;
280 fprintf(stderr,
282 _("Applying autostash resulted in conflicts.\n"
283 "Your changes are safe in the stash.\n"
284 "You can run \"git stash pop\" or \"git stash drop\" "
285 "at any time.\n"));
286 }
287 strbuf_release(&autostash);
289 return 0;
290}
291static int finish_rebase(struct rebase_options *opts)
293{
294 struct strbuf dir = STRBUF_INIT;
295 const char *argv_gc_auto[] = { "gc", "--auto", NULL };
296 delete_ref(NULL, "REBASE_HEAD", NULL, REF_NO_DEREF);
298 apply_autostash(opts);
299 close_all_packs(the_repository->objects);
300 /*
301 * We ignore errors in 'gc --auto', since the
302 * user should see them.
303 */
304 run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
305 strbuf_addstr(&dir, opts->state_dir);
306 remove_dir_recursively(&dir, 0);
307 strbuf_release(&dir);
308 return 0;
310}
311static struct commit *peel_committish(const char *name)
313{
314 struct object *obj;
315 struct object_id oid;
316 if (get_oid(name, &oid))
318 return NULL;
319 obj = parse_object(the_repository, &oid);
320 return (struct commit *)peel_to_type(name, 0, obj, OBJ_COMMIT);
321}
322static void add_var(struct strbuf *buf, const char *name, const char *value)
324{
325 if (!value)
326 strbuf_addf(buf, "unset %s; ", name);
327 else {
328 strbuf_addf(buf, "%s=", name);
329 sq_quote_buf(buf, value);
330 strbuf_addstr(buf, "; ");
331 }
332}
333static const char *resolvemsg =
335N_("Resolve all conflicts manually, mark them as resolved with\n"
336"\"git add/rm <conflicted_files>\", then run \"git rebase --continue\".\n"
337"You can instead skip this commit: run \"git rebase --skip\".\n"
338"To abort and get back to the state before \"git rebase\", run "
339"\"git rebase --abort\".");
340static int run_specific_rebase(struct rebase_options *opts)
342{
343 const char *argv[] = { NULL, NULL };
344 struct strbuf script_snippet = STRBUF_INIT, buf = STRBUF_INIT;
345 int status;
346 const char *backend, *backend_func;
347 if (opts->type == REBASE_INTERACTIVE) {
349 /* Run builtin interactive rebase */
350 struct child_process child = CHILD_PROCESS_INIT;
351 argv_array_pushf(&child.env_array, "GIT_CHERRY_PICK_HELP=%s",
353 resolvemsg);
354 if (!(opts->flags & REBASE_INTERACTIVE_EXPLICIT)) {
355 argv_array_push(&child.env_array,
356 "GIT_SEQUENCE_EDITOR=:");
357 opts->autosquash = 0;
358 }
359 child.git_cmd = 1;
361 argv_array_push(&child.args, "rebase--interactive");
362 if (opts->action)
364 argv_array_pushf(&child.args, "--%s", opts->action);
365 if (opts->keep_empty)
366 argv_array_push(&child.args, "--keep-empty");
367 if (opts->rebase_merges)
368 argv_array_push(&child.args, "--rebase-merges");
369 if (opts->rebase_cousins)
370 argv_array_push(&child.args, "--rebase-cousins");
371 if (opts->autosquash)
372 argv_array_push(&child.args, "--autosquash");
373 if (opts->flags & REBASE_VERBOSE)
374 argv_array_push(&child.args, "--verbose");
375 if (opts->flags & REBASE_FORCE)
376 argv_array_push(&child.args, "--no-ff");
377 if (opts->restrict_revision)
378 argv_array_pushf(&child.args,
379 "--restrict-revision=^%s",
380 oid_to_hex(&opts->restrict_revision->object.oid));
381 if (opts->upstream)
382 argv_array_pushf(&child.args, "--upstream=%s",
383 oid_to_hex(&opts->upstream->object.oid));
384 if (opts->onto)
385 argv_array_pushf(&child.args, "--onto=%s",
386 oid_to_hex(&opts->onto->object.oid));
387 if (opts->squash_onto)
388 argv_array_pushf(&child.args, "--squash-onto=%s",
389 oid_to_hex(opts->squash_onto));
390 if (opts->onto_name)
391 argv_array_pushf(&child.args, "--onto-name=%s",
392 opts->onto_name);
393 argv_array_pushf(&child.args, "--head-name=%s",
394 opts->head_name ?
395 opts->head_name : "detached HEAD");
396 if (opts->strategy)
397 argv_array_pushf(&child.args, "--strategy=%s",
398 opts->strategy);
399 if (opts->strategy_opts)
400 argv_array_pushf(&child.args, "--strategy-opts=%s",
401 opts->strategy_opts);
402 if (opts->switch_to)
403 argv_array_pushf(&child.args, "--switch-to=%s",
404 opts->switch_to);
405 if (opts->cmd)
406 argv_array_pushf(&child.args, "--cmd=%s", opts->cmd);
407 if (opts->allow_empty_message)
408 argv_array_push(&child.args, "--allow-empty-message");
409 if (opts->allow_rerere_autoupdate > 0)
410 argv_array_push(&child.args, "--rerere-autoupdate");
411 else if (opts->allow_rerere_autoupdate == 0)
412 argv_array_push(&child.args, "--no-rerere-autoupdate");
413 if (opts->gpg_sign_opt)
414 argv_array_push(&child.args, opts->gpg_sign_opt);
415 if (opts->signoff)
416 argv_array_push(&child.args, "--signoff");
417 if (opts->reschedule_failed_exec)
418 argv_array_push(&child.args, "--reschedule-failed-exec");
419 status = run_command(&child);
421 goto finished_rebase;
422 }
423 add_var(&script_snippet, "GIT_DIR", absolute_path(get_git_dir()));
425 add_var(&script_snippet, "state_dir", opts->state_dir);
426 add_var(&script_snippet, "upstream_name", opts->upstream_name);
428 add_var(&script_snippet, "upstream", opts->upstream ?
429 oid_to_hex(&opts->upstream->object.oid) : NULL);
430 add_var(&script_snippet, "head_name",
431 opts->head_name ? opts->head_name : "detached HEAD");
432 add_var(&script_snippet, "orig_head", oid_to_hex(&opts->orig_head));
433 add_var(&script_snippet, "onto", opts->onto ?
434 oid_to_hex(&opts->onto->object.oid) : NULL);
435 add_var(&script_snippet, "onto_name", opts->onto_name);
436 add_var(&script_snippet, "revisions", opts->revisions);
437 add_var(&script_snippet, "restrict_revision", opts->restrict_revision ?
438 oid_to_hex(&opts->restrict_revision->object.oid) : NULL);
439 add_var(&script_snippet, "GIT_QUIET",
440 opts->flags & REBASE_NO_QUIET ? "" : "t");
441 sq_quote_argv_pretty(&buf, opts->git_am_opts.argv);
442 add_var(&script_snippet, "git_am_opt", buf.buf);
443 strbuf_release(&buf);
444 add_var(&script_snippet, "verbose",
445 opts->flags & REBASE_VERBOSE ? "t" : "");
446 add_var(&script_snippet, "diffstat",
447 opts->flags & REBASE_DIFFSTAT ? "t" : "");
448 add_var(&script_snippet, "force_rebase",
449 opts->flags & REBASE_FORCE ? "t" : "");
450 if (opts->switch_to)
451 add_var(&script_snippet, "switch_to", opts->switch_to);
452 add_var(&script_snippet, "action", opts->action ? opts->action : "");
453 add_var(&script_snippet, "signoff", opts->signoff ? "--signoff" : "");
454 add_var(&script_snippet, "allow_rerere_autoupdate",
455 opts->allow_rerere_autoupdate < 0 ? "" :
456 opts->allow_rerere_autoupdate ?
457 "--rerere-autoupdate" : "--no-rerere-autoupdate");
458 add_var(&script_snippet, "keep_empty", opts->keep_empty ? "yes" : "");
459 add_var(&script_snippet, "autosquash", opts->autosquash ? "t" : "");
460 add_var(&script_snippet, "gpg_sign_opt", opts->gpg_sign_opt);
461 add_var(&script_snippet, "cmd", opts->cmd);
462 add_var(&script_snippet, "allow_empty_message",
463 opts->allow_empty_message ? "--allow-empty-message" : "");
464 add_var(&script_snippet, "rebase_merges",
465 opts->rebase_merges ? "t" : "");
466 add_var(&script_snippet, "rebase_cousins",
467 opts->rebase_cousins ? "t" : "");
468 add_var(&script_snippet, "strategy", opts->strategy);
469 add_var(&script_snippet, "strategy_opts", opts->strategy_opts);
470 add_var(&script_snippet, "rebase_root", opts->root ? "t" : "");
471 add_var(&script_snippet, "squash_onto",
472 opts->squash_onto ? oid_to_hex(opts->squash_onto) : "");
473 add_var(&script_snippet, "git_format_patch_opt",
474 opts->git_format_patch_opt.buf);
475 if (is_interactive(opts) &&
477 !(opts->flags & REBASE_INTERACTIVE_EXPLICIT)) {
478 strbuf_addstr(&script_snippet,
479 "GIT_SEQUENCE_EDITOR=:; export GIT_SEQUENCE_EDITOR; ");
480 opts->autosquash = 0;
481 }
482 switch (opts->type) {
484 case REBASE_AM:
485 backend = "git-rebase--am";
486 backend_func = "git_rebase__am";
487 break;
488 case REBASE_PRESERVE_MERGES:
489 backend = "git-rebase--preserve-merges";
490 backend_func = "git_rebase__preserve_merges";
491 break;
492 default:
493 BUG("Unhandled rebase type %d", opts->type);
494 break;
495 }
496 strbuf_addf(&script_snippet,
498 ". git-sh-setup && . git-rebase--common &&"
499 " . %s && %s", backend, backend_func);
500 argv[0] = script_snippet.buf;
501 status = run_command_v_opt(argv, RUN_USING_SHELL);
503finished_rebase:
504 if (opts->dont_finish_rebase)
505 ; /* do nothing */
506 else if (opts->type == REBASE_INTERACTIVE)
507 ; /* interactive rebase cleans up after itself */
508 else if (status == 0) {
509 if (!file_exists(state_dir_path("stopped-sha", opts)))
510 finish_rebase(opts);
511 } else if (status == 2) {
512 struct strbuf dir = STRBUF_INIT;
513 apply_autostash(opts);
515 strbuf_addstr(&dir, opts->state_dir);
516 remove_dir_recursively(&dir, 0);
517 strbuf_release(&dir);
518 die("Nothing to do");
519 }
520 strbuf_release(&script_snippet);
522 return status ? -1 : 0;
524}
525#define GIT_REFLOG_ACTION_ENVIRONMENT "GIT_REFLOG_ACTION"
527#define RESET_HEAD_DETACH (1<<0)
529#define RESET_HEAD_HARD (1<<1)
530#define RESET_HEAD_RUN_POST_CHECKOUT_HOOK (1<<2)
531static int reset_head(struct object_id *oid, const char *action,
533 const char *switch_to_branch, unsigned flags,
534 const char *reflog_orig_head, const char *reflog_head)
535{
536 unsigned detach_head = flags & RESET_HEAD_DETACH;
537 unsigned reset_hard = flags & RESET_HEAD_HARD;
538 unsigned run_hook = flags & RESET_HEAD_RUN_POST_CHECKOUT_HOOK;
539 struct object_id head_oid;
540 struct tree_desc desc[2] = { { NULL }, { NULL } };
541 struct lock_file lock = LOCK_INIT;
542 struct unpack_trees_options unpack_tree_opts;
543 struct tree *tree;
544 const char *reflog_action;
545 struct strbuf msg = STRBUF_INIT;
546 size_t prefix_len;
547 struct object_id *orig = NULL, oid_orig,
548 *old_orig = NULL, oid_old_orig;
549 int ret = 0, nr = 0;
550 if (switch_to_branch && !starts_with(switch_to_branch, "refs/"))
552 BUG("Not a fully qualified branch: '%s'", switch_to_branch);
553 if (hold_locked_index(&lock, LOCK_REPORT_ON_ERROR) < 0) {
555 ret = -1;
556 goto leave_reset_head;
557 }
558 if ((!oid || !reset_hard) && get_oid("HEAD", &head_oid)) {
560 ret = error(_("could not determine HEAD revision"));
561 goto leave_reset_head;
562 }
563 if (!oid)
565 oid = &head_oid;
566 memset(&unpack_tree_opts, 0, sizeof(unpack_tree_opts));
568 setup_unpack_trees_porcelain(&unpack_tree_opts, action);
569 unpack_tree_opts.head_idx = 1;
570 unpack_tree_opts.src_index = the_repository->index;
571 unpack_tree_opts.dst_index = the_repository->index;
572 unpack_tree_opts.fn = reset_hard ? oneway_merge : twoway_merge;
573 unpack_tree_opts.update = 1;
574 unpack_tree_opts.merge = 1;
575 if (!detach_head)
576 unpack_tree_opts.reset = 1;
577 if (read_index_unmerged(the_repository->index) < 0) {
579 ret = error(_("could not read index"));
580 goto leave_reset_head;
581 }
582 if (!reset_hard && !fill_tree_descriptor(&desc[nr++], &head_oid)) {
584 ret = error(_("failed to find tree of %s"),
585 oid_to_hex(&head_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, 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 }
638 if (run_hook)
639 run_hook_le(NULL, "post-checkout",
640 oid_to_hex(orig ? orig : &null_oid),
641 oid_to_hex(oid), "1", NULL);
642leave_reset_head:
644 strbuf_release(&msg);
645 rollback_lock_file(&lock);
646 while (nr)
647 free((void *)desc[--nr].buffer);
648 return ret;
649}
650static int rebase_config(const char *var, const char *value, void *data)
652{
653 struct rebase_options *opts = data;
654 if (!strcmp(var, "rebase.stat")) {
656 if (git_config_bool(var, value))
657 opts->flags |= REBASE_DIFFSTAT;
658 else
659 opts->flags &= !REBASE_DIFFSTAT;
660 return 0;
661 }
662 if (!strcmp(var, "rebase.autosquash")) {
664 opts->autosquash = git_config_bool(var, value);
665 return 0;
666 }
667 if (!strcmp(var, "commit.gpgsign")) {
669 free(opts->gpg_sign_opt);
670 opts->gpg_sign_opt = git_config_bool(var, value) ?
671 xstrdup("-S") : NULL;
672 return 0;
673 }
674 if (!strcmp(var, "rebase.autostash")) {
676 opts->autostash = git_config_bool(var, value);
677 return 0;
678 }
679 if (!strcmp(var, "rebase.reschedulefailedexec")) {
681 opts->reschedule_failed_exec = git_config_bool(var, value);
682 return 0;
683 }
684 return git_default_config(var, value, data);
686}
687/*
689 * Determines whether the commits in from..to are linear, i.e. contain
690 * no merge commits. This function *expects* `from` to be an ancestor of
691 * `to`.
692 */
693static int is_linear_history(struct commit *from, struct commit *to)
694{
695 while (to && to != from) {
696 parse_commit(to);
697 if (!to->parents)
698 return 1;
699 if (to->parents->next)
700 return 0;
701 to = to->parents->item;
702 }
703 return 1;
704}
705static int can_fast_forward(struct commit *onto, struct object_id *head_oid,
707 struct object_id *merge_base)
708{
709 struct commit *head = lookup_commit(the_repository, head_oid);
710 struct commit_list *merge_bases;
711 int res;
712 if (!head)
714 return 0;
715 merge_bases = get_merge_bases(onto, head);
717 if (merge_bases && !merge_bases->next) {
718 oidcpy(merge_base, &merge_bases->item->object.oid);
719 res = oideq(merge_base, &onto->object.oid);
720 } else {
721 oidcpy(merge_base, &null_oid);
722 res = 0;
723 }
724 free_commit_list(merge_bases);
725 return res && is_linear_history(onto, head);
726}
727/* -i followed by -m is still -i */
729static int parse_opt_merge(const struct option *opt, const char *arg, int unset)
730{
731 struct rebase_options *opts = opt->value;
732 BUG_ON_OPT_NEG(unset);
734 BUG_ON_OPT_ARG(arg);
735 if (!is_interactive(opts))
737 opts->type = REBASE_MERGE;
738 return 0;
740}
741/* -i followed by -p is still explicitly interactive, but -p alone is not */
743static int parse_opt_interactive(const struct option *opt, const char *arg,
744 int unset)
745{
746 struct rebase_options *opts = opt->value;
747 BUG_ON_OPT_NEG(unset);
749 BUG_ON_OPT_ARG(arg);
750 opts->type = REBASE_INTERACTIVE;
752 opts->flags |= REBASE_INTERACTIVE_EXPLICIT;
753 return 0;
755}
756struct opt_y {
758 struct string_list *list;
759 struct rebase_options *options;
760};
761static int parse_opt_y(const struct option *opt, const char *arg, int unset)
763{
764 struct opt_y *o = opt->value;
765 if (unset || !arg)
767 return -1;
768 o->options->reschedule_failed_exec = 1;
770 string_list_append(o->list, arg);
771 return 0;
772}
773static void NORETURN error_on_missing_default_upstream(void)
775{
776 struct branch *current_branch = branch_get(NULL);
777 printf(_("%s\n"
779 "Please specify which branch you want to rebase against.\n"
780 "See git-rebase(1) for details.\n"
781 "\n"
782 " git rebase '<branch>'\n"
783 "\n"),
784 current_branch ? _("There is no tracking information for "
785 "the current branch.") :
786 _("You are not currently on a branch."));
787 if (current_branch) {
789 const char *remote = current_branch->remote_name;
790 if (!remote)
792 remote = _("<remote>");
793 printf(_("If you wish to set tracking information for this "
795 "branch you can do so with:\n"
796 "\n"
797 " git branch --set-upstream-to=%s/<branch> %s\n"
798 "\n"),
799 remote, current_branch->name);
800 }
801 exit(1);
802}
803static void set_reflog_action(struct rebase_options *options)
805{
806 const char *env;
807 struct strbuf buf = STRBUF_INIT;
808 if (!is_interactive(options))
810 return;
811 env = getenv(GIT_REFLOG_ACTION_ENVIRONMENT);
813 if (env && strcmp("rebase", env))
814 return; /* only override it if it is "rebase" */
815 strbuf_addf(&buf, "rebase -i (%s)", options->action);
817 setenv(GIT_REFLOG_ACTION_ENVIRONMENT, buf.buf, 1);
818 strbuf_release(&buf);
819}
820int cmd_rebase(int argc, const char **argv, const char *prefix)
822{
823 struct rebase_options options = {
824 .type = REBASE_UNSPECIFIED,
825 .flags = REBASE_NO_QUIET,
826 .git_am_opts = ARGV_ARRAY_INIT,
827 .allow_rerere_autoupdate = -1,
828 .allow_empty_message = 1,
829 .git_format_patch_opt = STRBUF_INIT,
830 };
831 const char *branch_name;
832 int ret, flags, total_argc, in_progress = 0;
833 int ok_to_skip_pre_rebase = 0;
834 struct strbuf msg = STRBUF_INIT;
835 struct strbuf revisions = STRBUF_INIT;
836 struct strbuf buf = STRBUF_INIT;
837 struct object_id merge_base;
838 enum {
839 NO_ACTION,
840 ACTION_CONTINUE,
841 ACTION_SKIP,
842 ACTION_ABORT,
843 ACTION_QUIT,
844 ACTION_EDIT_TODO,
845 ACTION_SHOW_CURRENT_PATCH,
846 } action = NO_ACTION;
847 const char *gpg_sign = NULL;
848 struct string_list exec = STRING_LIST_INIT_NODUP;
849 const char *rebase_merges = NULL;
850 int fork_point = -1;
851 struct string_list strategy_options = STRING_LIST_INIT_NODUP;
852 struct object_id squash_onto;
853 char *squash_onto_name = NULL;
854 struct opt_y opt_y = { .list = &exec, .options = &options };
855 struct option builtin_rebase_options[] = {
856 OPT_STRING(0, "onto", &options.onto_name,
857 N_("revision"),
858 N_("rebase onto given branch instead of upstream")),
859 OPT_BOOL(0, "no-verify", &ok_to_skip_pre_rebase,
860 N_("allow pre-rebase hook to run")),
861 OPT_NEGBIT('q', "quiet", &options.flags,
862 N_("be quiet. implies --no-stat"),
863 REBASE_NO_QUIET| REBASE_VERBOSE | REBASE_DIFFSTAT),
864 OPT_BIT('v', "verbose", &options.flags,
865 N_("display a diffstat of what changed upstream"),
866 REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT),
867 {OPTION_NEGBIT, 'n', "no-stat", &options.flags, NULL,
868 N_("do not show diffstat of what changed upstream"),
869 PARSE_OPT_NOARG, NULL, REBASE_DIFFSTAT },
870 OPT_BOOL(0, "signoff", &options.signoff,
871 N_("add a Signed-off-by: line to each commit")),
872 OPT_PASSTHRU_ARGV(0, "ignore-whitespace", &options.git_am_opts,
873 NULL, N_("passed to 'git am'"),
874 PARSE_OPT_NOARG),
875 OPT_PASSTHRU_ARGV(0, "committer-date-is-author-date",
876 &options.git_am_opts, NULL,
877 N_("passed to 'git am'"), PARSE_OPT_NOARG),
878 OPT_PASSTHRU_ARGV(0, "ignore-date", &options.git_am_opts, NULL,
879 N_("passed to 'git am'"), PARSE_OPT_NOARG),
880 OPT_PASSTHRU_ARGV('C', NULL, &options.git_am_opts, N_("n"),
881 N_("passed to 'git apply'"), 0),
882 OPT_PASSTHRU_ARGV(0, "whitespace", &options.git_am_opts,
883 N_("action"), N_("passed to 'git apply'"), 0),
884 OPT_BIT('f', "force-rebase", &options.flags,
885 N_("cherry-pick all commits, even if unchanged"),
886 REBASE_FORCE),
887 OPT_BIT(0, "no-ff", &options.flags,
888 N_("cherry-pick all commits, even if unchanged"),
889 REBASE_FORCE),
890 OPT_CMDMODE(0, "continue", &action, N_("continue"),
891 ACTION_CONTINUE),
892 OPT_CMDMODE(0, "skip", &action,
893 N_("skip current patch and continue"), ACTION_SKIP),
894 OPT_CMDMODE(0, "abort", &action,
895 N_("abort and check out the original branch"),
896 ACTION_ABORT),
897 OPT_CMDMODE(0, "quit", &action,
898 N_("abort but keep HEAD where it is"), ACTION_QUIT),
899 OPT_CMDMODE(0, "edit-todo", &action, N_("edit the todo list "
900 "during an interactive rebase"), ACTION_EDIT_TODO),
901 OPT_CMDMODE(0, "show-current-patch", &action,
902 N_("show the patch file being applied or merged"),
903 ACTION_SHOW_CURRENT_PATCH),
904 { OPTION_CALLBACK, 'm', "merge", &options, NULL,
905 N_("use merging strategies to rebase"),
906 PARSE_OPT_NOARG | PARSE_OPT_NONEG,
907 parse_opt_merge },
908 { OPTION_CALLBACK, 'i', "interactive", &options, NULL,
909 N_("let the user edit the list of commits to rebase"),
910 PARSE_OPT_NOARG | PARSE_OPT_NONEG,
911 parse_opt_interactive },
912 OPT_SET_INT('p', "preserve-merges", &options.type,
913 N_("try to recreate merges instead of ignoring "
914 "them"), REBASE_PRESERVE_MERGES),
915 OPT_BOOL(0, "rerere-autoupdate",
916 &options.allow_rerere_autoupdate,
917 N_("allow rerere to update index with resolved "
918 "conflict")),
919 OPT_BOOL('k', "keep-empty", &options.keep_empty,
920 N_("preserve empty commits during rebase")),
921 OPT_BOOL(0, "autosquash", &options.autosquash,
922 N_("move commits that begin with "
923 "squash!/fixup! under -i")),
924 { OPTION_STRING, 'S', "gpg-sign", &gpg_sign, N_("key-id"),
925 N_("GPG-sign commits"),
926 PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
927 OPT_BOOL(0, "autostash", &options.autostash,
928 N_("automatically stash/stash pop before and after")),
929 OPT_STRING_LIST('x', "exec", &exec, N_("exec"),
930 N_("add exec lines after each commit of the "
931 "editable list")),
932 { OPTION_CALLBACK, 'y', NULL, &opt_y, N_("<cmd>"),
933 N_("same as --reschedule-failed-exec -x <cmd>"),
934 PARSE_OPT_NONEG, parse_opt_y },
935 OPT_BOOL(0, "allow-empty-message",
936 &options.allow_empty_message,
937 N_("allow rebasing commits with empty messages")),
938 {OPTION_STRING, 'r', "rebase-merges", &rebase_merges,
939 N_("mode"),
940 N_("try to rebase merges instead of skipping them"),
941 PARSE_OPT_OPTARG, NULL, (intptr_t)""},
942 OPT_BOOL(0, "fork-point", &fork_point,
943 N_("use 'merge-base --fork-point' to refine upstream")),
944 OPT_STRING('s', "strategy", &options.strategy,
945 N_("strategy"), N_("use the given merge strategy")),
946 OPT_STRING_LIST('X', "strategy-option", &strategy_options,
947 N_("option"),
948 N_("pass the argument through to the merge "
949 "strategy")),
950 OPT_BOOL(0, "root", &options.root,
951 N_("rebase all reachable commits up to the root(s)")),
952 OPT_BOOL(0, "reschedule-failed-exec",
953 &options.reschedule_failed_exec,
954 N_("automatically re-schedule any `exec` that fails")),
955 OPT_END(),
956 };
957 int i;
958 /*
960 * NEEDSWORK: Once the builtin rebase has been tested enough
961 * and git-legacy-rebase.sh is retired to contrib/, this preamble
962 * can be removed.
963 */
964 if (!use_builtin_rebase()) {
966 const char *path = mkpath("%s/git-legacy-rebase",
967 git_exec_path());
968 if (sane_execvp(path, (char **)argv) < 0)
970 die_errno(_("could not exec %s"), path);
971 else
972 BUG("sane_execvp() returned???");
973 }
974 if (argc == 2 && !strcmp(argv[1], "-h"))
976 usage_with_options(builtin_rebase_usage,
977 builtin_rebase_options);
978 prefix = setup_git_directory();
980 trace_repo_setup(prefix);
981 setup_work_tree();
982 git_config(rebase_config, &options);
984 strbuf_reset(&buf);
986 strbuf_addf(&buf, "%s/applying", apply_dir());
987 if(file_exists(buf.buf))
988 die(_("It looks like 'git am' is in progress. Cannot rebase."));
989 if (is_directory(apply_dir())) {
991 options.type = REBASE_AM;
992 options.state_dir = apply_dir();
993 } else if (is_directory(merge_dir())) {
994 strbuf_reset(&buf);
995 strbuf_addf(&buf, "%s/rewritten", merge_dir());
996 if (is_directory(buf.buf)) {
997 options.type = REBASE_PRESERVE_MERGES;
998 options.flags |= REBASE_INTERACTIVE_EXPLICIT;
999 } else {
1000 strbuf_reset(&buf);
1001 strbuf_addf(&buf, "%s/interactive", merge_dir());
1002 if(file_exists(buf.buf)) {
1003 options.type = REBASE_INTERACTIVE;
1004 options.flags |= REBASE_INTERACTIVE_EXPLICIT;
1005 } else
1006 options.type = REBASE_MERGE;
1007 }
1008 options.state_dir = merge_dir();
1009 }
1010 if (options.type != REBASE_UNSPECIFIED)
1012 in_progress = 1;
1013 total_argc = argc;
1015 argc = parse_options(argc, argv, prefix,
1016 builtin_rebase_options,
1017 builtin_rebase_usage, 0);
1018 if (action != NO_ACTION && total_argc != 2) {
1020 usage_with_options(builtin_rebase_usage,
1021 builtin_rebase_options);
1022 }
1023 if (argc > 2)
1025 usage_with_options(builtin_rebase_usage,
1026 builtin_rebase_options);
1027 if (action != NO_ACTION && !in_progress)
1029 die(_("No rebase in progress?"));
1030 setenv(GIT_REFLOG_ACTION_ENVIRONMENT, "rebase", 0);
1031 if (action == ACTION_EDIT_TODO && !is_interactive(&options))
1033 die(_("The --edit-todo action can only be used during "
1034 "interactive rebase."));
1035 switch (action) {
1037 case ACTION_CONTINUE: {
1038 struct object_id head;
1039 struct lock_file lock_file = LOCK_INIT;
1040 int fd;
1041 options.action = "continue";
1043 set_reflog_action(&options);
1044 /* Sanity check */
1046 if (get_oid("HEAD", &head))
1047 die(_("Cannot read HEAD"));
1048 fd = hold_locked_index(&lock_file, 0);
1050 if (read_index(the_repository->index) < 0)
1051 die(_("could not read index"));
1052 refresh_index(the_repository->index, REFRESH_QUIET, NULL, NULL,
1053 NULL);
1054 if (0 <= fd)
1055 update_index_if_able(the_repository->index,
1056 &lock_file);
1057 rollback_lock_file(&lock_file);
1058 if (has_unstaged_changes(the_repository, 1)) {
1060 puts(_("You must edit all merge conflicts and then\n"
1061 "mark them as resolved using git add"));
1062 exit(1);
1063 }
1064 if (read_basic_state(&options))
1065 exit(1);
1066 goto run_rebase;
1067 }
1068 case ACTION_SKIP: {
1069 struct string_list merge_rr = STRING_LIST_INIT_DUP;
1070 options.action = "skip";
1072 set_reflog_action(&options);
1073 rerere_clear(the_repository, &merge_rr);
1075 string_list_clear(&merge_rr, 1);
1076 if (reset_head(NULL, "reset", NULL, RESET_HEAD_HARD,
1078 NULL, NULL) < 0)
1079 die(_("could not discard worktree changes"));
1080 remove_branch_state(the_repository);
1081 if (read_basic_state(&options))
1082 exit(1);
1083 goto run_rebase;
1084 }
1085 case ACTION_ABORT: {
1086 struct string_list merge_rr = STRING_LIST_INIT_DUP;
1087 options.action = "abort";
1088 set_reflog_action(&options);
1089 rerere_clear(the_repository, &merge_rr);
1091 string_list_clear(&merge_rr, 1);
1092 if (read_basic_state(&options))
1094 exit(1);
1095 if (reset_head(&options.orig_head, "reset",
1096 options.head_name, RESET_HEAD_HARD,
1097 NULL, NULL) < 0)
1098 die(_("could not move back to %s"),
1099 oid_to_hex(&options.orig_head));
1100 remove_branch_state(the_repository);
1101 ret = finish_rebase(&options);
1102 goto cleanup;
1103 }
1104 case ACTION_QUIT: {
1105 strbuf_reset(&buf);
1106 strbuf_addstr(&buf, options.state_dir);
1107 ret = !!remove_dir_recursively(&buf, 0);
1108 if (ret)
1109 die(_("could not remove '%s'"), options.state_dir);
1110 goto cleanup;
1111 }
1112 case ACTION_EDIT_TODO:
1113 options.action = "edit-todo";
1114 options.dont_finish_rebase = 1;
1115 goto run_rebase;
1116 case ACTION_SHOW_CURRENT_PATCH:
1117 options.action = "show-current-patch";
1118 options.dont_finish_rebase = 1;
1119 goto run_rebase;
1120 case NO_ACTION:
1121 break;
1122 default:
1123 BUG("action: %d", action);
1124 }
1125 /* Make sure no rebase is in progress */
1127 if (in_progress) {
1128 const char *last_slash = strrchr(options.state_dir, '/');
1129 const char *state_dir_base =
1130 last_slash ? last_slash + 1 : options.state_dir;
1131 const char *cmd_live_rebase =
1132 "git rebase (--continue | --abort | --skip)";
1133 strbuf_reset(&buf);
1134 strbuf_addf(&buf, "rm -fr \"%s\"", options.state_dir);
1135 die(_("It seems that there is already a %s directory, and\n"
1136 "I wonder if you are in the middle of another rebase. "
1137 "If that is the\n"
1138 "case, please try\n\t%s\n"
1139 "If that is not the case, please\n\t%s\n"
1140 "and run me again. I am stopping in case you still "
1141 "have something\n"
1142 "valuable there.\n"),
1143 state_dir_base, cmd_live_rebase, buf.buf);
1144 }
1145 for (i = 0; i < options.git_am_opts.argc; i++) {
1147 const char *option = options.git_am_opts.argv[i], *p;
1148 if (!strcmp(option, "--committer-date-is-author-date") ||
1149 !strcmp(option, "--ignore-date") ||
1150 !strcmp(option, "--whitespace=fix") ||
1151 !strcmp(option, "--whitespace=strip"))
1152 options.flags |= REBASE_FORCE;
1153 else if (skip_prefix(option, "-C", &p)) {
1154 while (*p)
1155 if (!isdigit(*(p++)))
1156 die(_("switch `C' expects a "
1157 "numerical value"));
1158 } else if (skip_prefix(option, "--whitespace=", &p)) {
1159 if (*p && strcmp(p, "warn") && strcmp(p, "nowarn") &&
1160 strcmp(p, "error") && strcmp(p, "error-all"))
1161 die("Invalid whitespace option: '%s'", p);
1162 }
1163 }
1164 if (!(options.flags & REBASE_NO_QUIET))
1166 argv_array_push(&options.git_am_opts, "-q");
1167 if (options.keep_empty)
1169 imply_interactive(&options, "--keep-empty");
1170 if (gpg_sign) {
1172 free(options.gpg_sign_opt);
1173 options.gpg_sign_opt = xstrfmt("-S%s", gpg_sign);
1174 }
1175 if (exec.nr) {
1177 int i;
1178 imply_interactive(&options, "--exec");
1180 strbuf_reset(&buf);
1182 for (i = 0; i < exec.nr; i++)
1183 strbuf_addf(&buf, "exec %s\n", exec.items[i].string);
1184 options.cmd = xstrdup(buf.buf);
1185 }
1186 if (rebase_merges) {
1188 if (!*rebase_merges)
1189 ; /* default mode; do nothing */
1190 else if (!strcmp("rebase-cousins", rebase_merges))
1191 options.rebase_cousins = 1;
1192 else if (strcmp("no-rebase-cousins", rebase_merges))
1193 die(_("Unknown mode: %s"), rebase_merges);
1194 options.rebase_merges = 1;
1195 imply_interactive(&options, "--rebase-merges");
1196 }
1197 if (strategy_options.nr) {
1199 int i;
1200 if (!options.strategy)
1202 options.strategy = "recursive";
1203 strbuf_reset(&buf);
1205 for (i = 0; i < strategy_options.nr; i++)
1206 strbuf_addf(&buf, " --%s",
1207 strategy_options.items[i].string);
1208 options.strategy_opts = xstrdup(buf.buf);
1209 }
1210 if (options.strategy) {
1212 options.strategy = xstrdup(options.strategy);
1213 switch (options.type) {
1214 case REBASE_AM:
1215 die(_("--strategy requires --merge or --interactive"));
1216 case REBASE_MERGE:
1217 case REBASE_INTERACTIVE:
1218 case REBASE_PRESERVE_MERGES:
1219 /* compatible */
1220 break;
1221 case REBASE_UNSPECIFIED:
1222 options.type = REBASE_MERGE;
1223 break;
1224 default:
1225 BUG("unhandled rebase type (%d)", options.type);
1226 }
1227 }
1228 if (options.type == REBASE_MERGE)
1230 imply_interactive(&options, "--merge");
1231 if (options.root && !options.onto_name)
1233 imply_interactive(&options, "--root without --onto");
1234 if (isatty(2) && options.flags & REBASE_NO_QUIET)
1236 strbuf_addstr(&options.git_format_patch_opt, " --progress");
1237 switch (options.type) {
1239 case REBASE_MERGE:
1240 case REBASE_INTERACTIVE:
1241 case REBASE_PRESERVE_MERGES:
1242 options.state_dir = merge_dir();
1243 break;
1244 case REBASE_AM:
1245 options.state_dir = apply_dir();
1246 break;
1247 default:
1248 /* the default rebase backend is `--am` */
1249 options.type = REBASE_AM;
1250 options.state_dir = apply_dir();
1251 break;
1252 }
1253 if (options.reschedule_failed_exec && !is_interactive(&options))
1255 die(_("--reschedule-failed-exec requires an interactive rebase"));
1256 if (options.git_am_opts.argc) {
1258 /* all am options except -q are compatible only with --am */
1259 for (i = options.git_am_opts.argc - 1; i >= 0; i--)
1260 if (strcmp(options.git_am_opts.argv[i], "-q"))
1261 break;
1262 if (is_interactive(&options) && i >= 0)
1264 die(_("cannot combine am options with either "
1265 "interactive or merge options"));
1266 }
1267 if (options.signoff) {
1269 if (options.type == REBASE_PRESERVE_MERGES)
1270 die("cannot combine '--signoff' with "
1271 "'--preserve-merges'");
1272 argv_array_push(&options.git_am_opts, "--signoff");
1273 options.flags |= REBASE_FORCE;
1274 }
1275 if (options.type == REBASE_PRESERVE_MERGES) {
1277 /*
1278 * Note: incompatibility with --signoff handled in signoff block above
1279 * Note: incompatibility with --interactive is just a strong warning;
1280 * git-rebase.txt caveats with "unless you know what you are doing"
1281 */
1282 if (options.rebase_merges)
1283 die(_("cannot combine '--preserve-merges' with "
1284 "'--rebase-merges'"));
1285 if (options.reschedule_failed_exec)
1287 die(_("error: cannot combine '--preserve-merges' with "
1288 "'--reschedule-failed-exec'"));
1289 }
1290 if (options.rebase_merges) {
1292 if (strategy_options.nr)
1293 die(_("cannot combine '--rebase-merges' with "
1294 "'--strategy-option'"));
1295 if (options.strategy)
1296 die(_("cannot combine '--rebase-merges' with "
1297 "'--strategy'"));
1298 }
1299 if (!options.root) {
1301 if (argc < 1) {
1302 struct branch *branch;
1303 branch = branch_get(NULL);
1305 options.upstream_name = branch_get_upstream(branch,
1306 NULL);
1307 if (!options.upstream_name)
1308 error_on_missing_default_upstream();
1309 if (fork_point < 0)
1310 fork_point = 1;
1311 } else {
1312 options.upstream_name = argv[0];
1313 argc--;
1314 argv++;
1315 if (!strcmp(options.upstream_name, "-"))
1316 options.upstream_name = "@{-1}";
1317 }
1318 options.upstream = peel_committish(options.upstream_name);
1319 if (!options.upstream)
1320 die(_("invalid upstream '%s'"), options.upstream_name);
1321 options.upstream_arg = options.upstream_name;
1322 } else {
1323 if (!options.onto_name) {
1324 if (commit_tree("", 0, the_hash_algo->empty_tree, NULL,
1325 &squash_onto, NULL, NULL) < 0)
1326 die(_("Could not create new root commit"));
1327 options.squash_onto = &squash_onto;
1328 options.onto_name = squash_onto_name =
1329 xstrdup(oid_to_hex(&squash_onto));
1330 }
1331 options.upstream_name = NULL;
1332 options.upstream = NULL;
1333 if (argc > 1)
1334 usage_with_options(builtin_rebase_usage,
1335 builtin_rebase_options);
1336 options.upstream_arg = "--root";
1337 }
1338 /* Make sure the branch to rebase onto is valid. */
1340 if (!options.onto_name)
1341 options.onto_name = options.upstream_name;
1342 if (strstr(options.onto_name, "...")) {
1343 if (get_oid_mb(options.onto_name, &merge_base) < 0)
1344 die(_("'%s': need exactly one merge base"),
1345 options.onto_name);
1346 options.onto = lookup_commit_or_die(&merge_base,
1347 options.onto_name);
1348 } else {
1349 options.onto = peel_committish(options.onto_name);
1350 if (!options.onto)
1351 die(_("Does not point to a valid commit '%s'"),
1352 options.onto_name);
1353 }
1354 /*
1356 * If the branch to rebase is given, that is the branch we will rebase
1357 * branch_name -- branch/commit being rebased, or
1358 * HEAD (already detached)
1359 * orig_head -- commit object name of tip of the branch before rebasing
1360 * head_name -- refs/heads/<that-branch> or NULL (detached HEAD)
1361 */
1362 if (argc == 1) {
1363 /* Is it "rebase other branchname" or "rebase other commit"? */
1364 branch_name = argv[0];
1365 options.switch_to = argv[0];
1366 /* Is it a local branch? */
1368 strbuf_reset(&buf);
1369 strbuf_addf(&buf, "refs/heads/%s", branch_name);
1370 if (!read_ref(buf.buf, &options.orig_head))
1371 options.head_name = xstrdup(buf.buf);
1372 /* If not is it a valid ref (branch or commit)? */
1373 else if (!get_oid(branch_name, &options.orig_head))
1374 options.head_name = NULL;
1375 else
1376 die(_("fatal: no such branch/commit '%s'"),
1377 branch_name);
1378 } else if (argc == 0) {
1379 /* Do not need to switch branches, we are already on it. */
1380 options.head_name =
1381 xstrdup_or_null(resolve_ref_unsafe("HEAD", 0, NULL,
1382 &flags));
1383 if (!options.head_name)
1384 die(_("No such ref: %s"), "HEAD");
1385 if (flags & REF_ISSYMREF) {
1386 if (!skip_prefix(options.head_name,
1387 "refs/heads/", &branch_name))
1388 branch_name = options.head_name;
1389 } else {
1391 free(options.head_name);
1392 options.head_name = NULL;
1393 branch_name = "HEAD";
1394 }
1395 if (get_oid("HEAD", &options.orig_head))
1396 die(_("Could not resolve HEAD to a revision"));
1397 } else
1398 BUG("unexpected number of arguments left to parse");
1399 if (fork_point > 0) {
1401 struct commit *head =
1402 lookup_commit_reference(the_repository,
1403 &options.orig_head);
1404 options.restrict_revision =
1405 get_fork_point(options.upstream_name, head);
1406 }
1407 if (read_index(the_repository->index) < 0)
1409 die(_("could not read index"));
1410 if (options.autostash) {
1412 struct lock_file lock_file = LOCK_INIT;
1413 int fd;
1414 fd = hold_locked_index(&lock_file, 0);
1416 refresh_cache(REFRESH_QUIET);
1417 if (0 <= fd)
1418 update_index_if_able(&the_index, &lock_file);
1419 rollback_lock_file(&lock_file);
1420 if (has_unstaged_changes(the_repository, 1) ||
1422 has_uncommitted_changes(the_repository, 1)) {
1423 const char *autostash =
1424 state_dir_path("autostash", &options);
1425 struct child_process stash = CHILD_PROCESS_INIT;
1426 struct object_id oid;
1427 struct commit *head =
1428 lookup_commit_reference(the_repository,
1429 &options.orig_head);
1430 argv_array_pushl(&stash.args,
1432 "stash", "create", "autostash", NULL);
1433 stash.git_cmd = 1;
1434 stash.no_stdin = 1;
1435 strbuf_reset(&buf);
1436 if (capture_command(&stash, &buf, GIT_MAX_HEXSZ))
1437 die(_("Cannot autostash"));
1438 strbuf_trim_trailing_newline(&buf);
1439 if (get_oid(buf.buf, &oid))
1440 die(_("Unexpected stash response: '%s'"),
1441 buf.buf);
1442 strbuf_reset(&buf);
1443 strbuf_add_unique_abbrev(&buf, &oid, DEFAULT_ABBREV);
1444 if (safe_create_leading_directories_const(autostash))
1446 die(_("Could not create directory for '%s'"),
1447 options.state_dir);
1448 write_file(autostash, "%s", oid_to_hex(&oid));
1449 printf(_("Created autostash: %s\n"), buf.buf);
1450 if (reset_head(&head->object.oid, "reset --hard",
1451 NULL, RESET_HEAD_HARD, NULL, NULL) < 0)
1452 die(_("could not reset --hard"));
1453 printf(_("HEAD is now at %s"),
1454 find_unique_abbrev(&head->object.oid,
1455 DEFAULT_ABBREV));
1456 strbuf_reset(&buf);
1457 pp_commit_easy(CMIT_FMT_ONELINE, head, &buf);
1458 if (buf.len > 0)
1459 printf(" %s", buf.buf);
1460 putchar('\n');
1461 if (discard_index(the_repository->index) < 0 ||
1463 read_index(the_repository->index) < 0)
1464 die(_("could not read index"));
1465 }
1466 }
1467 if (require_clean_work_tree(the_repository, "rebase",
1469 _("Please commit or stash them."), 1, 1)) {
1470 ret = 1;
1471 goto cleanup;
1472 }
1473 /*
1475 * Now we are rebasing commits upstream..orig_head (or with --root,
1476 * everything leading up to orig_head) on top of onto.
1477 */
1478 /*
1480 * Check if we are already based on onto with linear history,
1481 * but this should be done only when upstream and onto are the same
1482 * and if this is not an interactive rebase.
1483 */
1484 if (can_fast_forward(options.onto, &options.orig_head, &merge_base) &&
1485 !is_interactive(&options) && !options.restrict_revision &&
1486 options.upstream &&
1487 !oidcmp(&options.upstream->object.oid, &options.onto->object.oid)) {
1488 int flag;
1489 if (!(options.flags & REBASE_FORCE)) {
1491 /* Lazily switch to the target branch if needed... */
1492 if (options.switch_to) {
1493 struct object_id oid;
1494 if (get_oid(options.switch_to, &oid) < 0) {
1496 ret = !!error(_("could not parse '%s'"),
1497 options.switch_to);
1498 goto cleanup;
1499 }
1500 strbuf_reset(&buf);
1502 strbuf_addf(&buf, "%s: checkout %s",
1503 getenv(GIT_REFLOG_ACTION_ENVIRONMENT),
1504 options.switch_to);
1505 if (reset_head(&oid, "checkout",
1506 options.head_name,
1507 RESET_HEAD_RUN_POST_CHECKOUT_HOOK,
1508 NULL, buf.buf) < 0) {
1509 ret = !!error(_("could not switch to "
1510 "%s"),
1511 options.switch_to);
1512 goto cleanup;
1513 }
1514 }
1515 if (!(options.flags & REBASE_NO_QUIET))
1517 ; /* be quiet */
1518 else if (!strcmp(branch_name, "HEAD") &&
1519 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
1520 puts(_("HEAD is up to date."));
1521 else
1522 printf(_("Current branch %s is up to date.\n"),
1523 branch_name);
1524 ret = !!finish_rebase(&options);
1525 goto cleanup;
1526 } else if (!(options.flags & REBASE_NO_QUIET))
1527 ; /* be quiet */
1528 else if (!strcmp(branch_name, "HEAD") &&
1529 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
1530 puts(_("HEAD is up to date, rebase forced."));
1531 else
1532 printf(_("Current branch %s is up to date, rebase "
1533 "forced.\n"), branch_name);
1534 }
1535 /* If a hook exists, give it a chance to interrupt*/
1537 if (!ok_to_skip_pre_rebase &&
1538 run_hook_le(NULL, "pre-rebase", options.upstream_arg,
1539 argc ? argv[0] : NULL, NULL))
1540 die(_("The pre-rebase hook refused to rebase."));
1541 if (options.flags & REBASE_DIFFSTAT) {
1543 struct diff_options opts;
1544 if (options.flags & REBASE_VERBOSE) {
1546 if (is_null_oid(&merge_base))
1547 printf(_("Changes to %s:\n"),
1548 oid_to_hex(&options.onto->object.oid));
1549 else
1550 printf(_("Changes from %s to %s:\n"),
1551 oid_to_hex(&merge_base),
1552 oid_to_hex(&options.onto->object.oid));
1553 }
1554 /* We want color (if set), but no pager */
1556 diff_setup(&opts);
1557 opts.stat_width = -1; /* use full terminal width */
1558 opts.stat_graph_width = -1; /* respect statGraphWidth config */
1559 opts.output_format |=
1560 DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
1561 opts.detect_rename = DIFF_DETECT_RENAME;
1562 diff_setup_done(&opts);
1563 diff_tree_oid(is_null_oid(&merge_base) ?
1564 the_hash_algo->empty_tree : &merge_base,
1565 &options.onto->object.oid, "", &opts);
1566 diffcore_std(&opts);
1567 diff_flush(&opts);
1568 }
1569 if (is_interactive(&options))
1571 goto run_rebase;
1572 /* Detach HEAD and reset the tree */
1574 if (options.flags & REBASE_NO_QUIET)
1575 printf(_("First, rewinding head to replay your work on top of "
1576 "it...\n"));
1577 strbuf_addf(&msg, "%s: checkout %s",
1579 getenv(GIT_REFLOG_ACTION_ENVIRONMENT), options.onto_name);
1580 if (reset_head(&options.onto->object.oid, "checkout", NULL,
1581 RESET_HEAD_DETACH | RESET_HEAD_RUN_POST_CHECKOUT_HOOK,
1582 NULL, msg.buf))
1583 die(_("Could not detach HEAD"));
1584 strbuf_release(&msg);
1585 /*
1587 * If the onto is a proper descendant of the tip of the branch, then
1588 * we just fast-forwarded.
1589 */
1590 strbuf_reset(&msg);
1591 if (!oidcmp(&merge_base, &options.orig_head)) {
1592 printf(_("Fast-forwarded %s to %s.\n"),
1593 branch_name, options.onto_name);
1594 strbuf_addf(&msg, "rebase finished: %s onto %s",
1595 options.head_name ? options.head_name : "detached HEAD",
1596 oid_to_hex(&options.onto->object.oid));
1597 reset_head(NULL, "Fast-forwarded", options.head_name, 0,
1598 "HEAD", msg.buf);
1599 strbuf_release(&msg);
1600 ret = !!finish_rebase(&options);
1601 goto cleanup;
1602 }
1603 strbuf_addf(&revisions, "%s..%s",
1605 options.root ? oid_to_hex(&options.onto->object.oid) :
1606 (options.restrict_revision ?
1607 oid_to_hex(&options.restrict_revision->object.oid) :
1608 oid_to_hex(&options.upstream->object.oid)),
1609 oid_to_hex(&options.orig_head));
1610 options.revisions = revisions.buf;
1612run_rebase:
1614 ret = !!run_specific_rebase(&options);
1615cleanup:
1617 strbuf_release(&revisions);
1618 free(options.head_name);
1619 free(options.gpg_sign_opt);
1620 free(options.cmd);
1621 free(squash_onto_name);
1622 return ret;
1623}