f023fb4339c3add658c452789acc4025c7821497
1/*
2 * "git rebase" builtin command
3 *
4 * Copyright (c) 2018 Pratik Karki
5 */
6#include "builtin.h"
8#include "run-command.h"
9#include "exec-cmd.h"
10#include "argv-array.h"
11#include "dir.h"
12#include "packfile.h"
13#include "refs.h"
14#include "quote.h"
15#include "config.h"
16#include "cache-tree.h"
17#include "unpack-trees.h"
18#include "lockfile.h"
19#include "parse-options.h"
20#include "commit.h"
21#include "diff.h"
22#include "wt-status.h"
23#include "revision.h"
24#include "rerere.h"
25static char const * const builtin_rebase_usage[] = {
27 N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] "
28 "[<upstream>] [<branch>]"),
29 N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] "
30 "--root [<branch>]"),
31 N_("git rebase --continue | --abort | --skip | --edit-todo"),
32 NULL
33};
34static GIT_PATH_FUNC(apply_dir, "rebase-apply")
36static GIT_PATH_FUNC(merge_dir, "rebase-merge")
37enum rebase_type {
39 REBASE_UNSPECIFIED = -1,
40 REBASE_AM,
41 REBASE_MERGE,
42 REBASE_INTERACTIVE,
43 REBASE_PRESERVE_MERGES
44};
45static int use_builtin_rebase(void)
47{
48 struct child_process cp = CHILD_PROCESS_INIT;
49 struct strbuf out = STRBUF_INIT;
50 int ret;
51 argv_array_pushl(&cp.args,
53 "config", "--bool", "rebase.usebuiltin", NULL);
54 cp.git_cmd = 1;
55 if (capture_command(&cp, &out, 6)) {
56 strbuf_release(&out);
57 return 0;
58 }
59 strbuf_trim(&out);
61 ret = !strcmp("true", out.buf);
62 strbuf_release(&out);
63 return ret;
64}
65static int apply_autostash(void)
67{
68 warning("TODO");
69 return 0;
70}
71struct rebase_options {
73 enum rebase_type type;
74 const char *state_dir;
75 struct commit *upstream;
76 const char *upstream_name;
77 const char *upstream_arg;
78 char *head_name;
79 struct object_id orig_head;
80 struct commit *onto;
81 const char *onto_name;
82 const char *revisions;
83 const char *switch_to;
84 int root;
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 strbuf git_am_opt;
95 const char *action;
96 int signoff;
97 int allow_rerere_autoupdate;
98};
99static int is_interactive(struct rebase_options *opts)
101{
102 return opts->type == REBASE_INTERACTIVE ||
103 opts->type == REBASE_PRESERVE_MERGES;
104}
105/* Returns the filename prefixed by the state_dir */
107static const char *state_dir_path(const char *filename, struct rebase_options *opts)
108{
109 static struct strbuf path = STRBUF_INIT;
110 static size_t prefix_len;
111 if (!prefix_len) {
113 strbuf_addf(&path, "%s/", opts->state_dir);
114 prefix_len = path.len;
115 }
116 strbuf_setlen(&path, prefix_len);
118 strbuf_addstr(&path, filename);
119 return path.buf;
120}
121/* Read one file, then strip line endings */
123static int read_one(const char *path, struct strbuf *buf)
124{
125 if (strbuf_read_file(buf, path, 0) < 0)
126 return error_errno(_("could not read '%s'"), path);
127 strbuf_trim_trailing_newline(buf);
128 return 0;
129}
130/* Initialize the rebase options from the state directory. */
132static int read_basic_state(struct rebase_options *opts)
133{
134 struct strbuf head_name = STRBUF_INIT;
135 struct strbuf buf = STRBUF_INIT;
136 struct object_id oid;
137 if (read_one(state_dir_path("head-name", opts), &head_name) ||
139 read_one(state_dir_path("onto", opts), &buf))
140 return -1;
141 opts->head_name = starts_with(head_name.buf, "refs/") ?
142 xstrdup(head_name.buf) : NULL;
143 strbuf_release(&head_name);
144 if (get_oid(buf.buf, &oid))
145 return error(_("could not get 'onto': '%s'"), buf.buf);
146 opts->onto = lookup_commit_or_die(&oid, buf.buf);
147 /*
149 * We always write to orig-head, but interactive rebase used to write to
150 * head. Fall back to reading from head to cover for the case that the
151 * user upgraded git with an ongoing interactive rebase.
152 */
153 strbuf_reset(&buf);
154 if (file_exists(state_dir_path("orig-head", opts))) {
155 if (read_one(state_dir_path("orig-head", opts), &buf))
156 return -1;
157 } else if (read_one(state_dir_path("head", opts), &buf))
158 return -1;
159 if (get_oid(buf.buf, &opts->orig_head))
160 return error(_("invalid orig-head: '%s'"), buf.buf);
161 strbuf_reset(&buf);
163 if (read_one(state_dir_path("quiet", opts), &buf))
164 return -1;
165 if (buf.len)
166 opts->flags &= ~REBASE_NO_QUIET;
167 else
168 opts->flags |= REBASE_NO_QUIET;
169 if (file_exists(state_dir_path("verbose", opts)))
171 opts->flags |= REBASE_VERBOSE;
172 if (file_exists(state_dir_path("signoff", opts))) {
174 opts->signoff = 1;
175 opts->flags |= REBASE_FORCE;
176 }
177 if (file_exists(state_dir_path("allow_rerere_autoupdate", opts))) {
179 strbuf_reset(&buf);
180 if (read_one(state_dir_path("allow_rerere_autoupdate", opts),
181 &buf))
182 return -1;
183 if (!strcmp(buf.buf, "--rerere-autoupdate"))
184 opts->allow_rerere_autoupdate = 1;
185 else if (!strcmp(buf.buf, "--no-rerere-autoupdate"))
186 opts->allow_rerere_autoupdate = 0;
187 else
188 warning(_("ignoring invalid allow_rerere_autoupdate: "
189 "'%s'"), buf.buf);
190 } else
191 opts->allow_rerere_autoupdate = -1;
192 strbuf_release(&buf);
194 return 0;
196}
197static int finish_rebase(struct rebase_options *opts)
199{
200 struct strbuf dir = STRBUF_INIT;
201 const char *argv_gc_auto[] = { "gc", "--auto", NULL };
202 delete_ref(NULL, "REBASE_HEAD", NULL, REF_NO_DEREF);
204 apply_autostash();
205 close_all_packs(the_repository->objects);
206 /*
207 * We ignore errors in 'gc --auto', since the
208 * user should see them.
209 */
210 run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
211 strbuf_addstr(&dir, opts->state_dir);
212 remove_dir_recursively(&dir, 0);
213 strbuf_release(&dir);
214 return 0;
216}
217static struct commit *peel_committish(const char *name)
219{
220 struct object *obj;
221 struct object_id oid;
222 if (get_oid(name, &oid))
224 return NULL;
225 obj = parse_object(the_repository, &oid);
226 return (struct commit *)peel_to_type(name, 0, obj, OBJ_COMMIT);
227}
228static void add_var(struct strbuf *buf, const char *name, const char *value)
230{
231 if (!value)
232 strbuf_addf(buf, "unset %s; ", name);
233 else {
234 strbuf_addf(buf, "%s=", name);
235 sq_quote_buf(buf, value);
236 strbuf_addstr(buf, "; ");
237 }
238}
239static int run_specific_rebase(struct rebase_options *opts)
241{
242 const char *argv[] = { NULL, NULL };
243 struct strbuf script_snippet = STRBUF_INIT;
244 int status;
245 const char *backend, *backend_func;
246 add_var(&script_snippet, "GIT_DIR", absolute_path(get_git_dir()));
248 add_var(&script_snippet, "state_dir", opts->state_dir);
249 add_var(&script_snippet, "upstream_name", opts->upstream_name);
251 add_var(&script_snippet, "upstream", opts->upstream ?
252 oid_to_hex(&opts->upstream->object.oid) : NULL);
253 add_var(&script_snippet, "head_name",
254 opts->head_name ? opts->head_name : "detached HEAD");
255 add_var(&script_snippet, "orig_head", oid_to_hex(&opts->orig_head));
256 add_var(&script_snippet, "onto", opts->onto ?
257 oid_to_hex(&opts->onto->object.oid) : NULL);
258 add_var(&script_snippet, "onto_name", opts->onto_name);
259 add_var(&script_snippet, "revisions", opts->revisions);
260 add_var(&script_snippet, "restrict_revision", opts->restrict_revision ?
261 oid_to_hex(&opts->restrict_revision->object.oid) : NULL);
262 add_var(&script_snippet, "GIT_QUIET",
263 opts->flags & REBASE_NO_QUIET ? "" : "t");
264 add_var(&script_snippet, "git_am_opt", opts->git_am_opt.buf);
265 add_var(&script_snippet, "verbose",
266 opts->flags & REBASE_VERBOSE ? "t" : "");
267 add_var(&script_snippet, "diffstat",
268 opts->flags & REBASE_DIFFSTAT ? "t" : "");
269 add_var(&script_snippet, "force_rebase",
270 opts->flags & REBASE_FORCE ? "t" : "");
271 if (opts->switch_to)
272 add_var(&script_snippet, "switch_to", opts->switch_to);
273 add_var(&script_snippet, "action", opts->action ? opts->action : "");
274 add_var(&script_snippet, "signoff", opts->signoff ? "--signoff" : "");
275 add_var(&script_snippet, "allow_rerere_autoupdate",
276 opts->allow_rerere_autoupdate < 0 ? "" :
277 opts->allow_rerere_autoupdate ?
278 "--rerere-autoupdate" : "--no-rerere-autoupdate");
279 switch (opts->type) {
281 case REBASE_AM:
282 backend = "git-rebase--am";
283 backend_func = "git_rebase__am";
284 break;
285 case REBASE_INTERACTIVE:
286 backend = "git-rebase--interactive";
287 backend_func = "git_rebase__interactive";
288 break;
289 case REBASE_MERGE:
290 backend = "git-rebase--merge";
291 backend_func = "git_rebase__merge";
292 break;
293 case REBASE_PRESERVE_MERGES:
294 backend = "git-rebase--preserve-merges";
295 backend_func = "git_rebase__preserve_merges";
296 break;
297 default:
298 BUG("Unhandled rebase type %d", opts->type);
299 break;
300 }
301 strbuf_addf(&script_snippet,
303 ". git-sh-setup && . git-rebase--common &&"
304 " . %s && %s", backend, backend_func);
305 argv[0] = script_snippet.buf;
306 status = run_command_v_opt(argv, RUN_USING_SHELL);
308 if (opts->dont_finish_rebase)
309 ; /* do nothing */
310 else if (status == 0) {
311 if (!file_exists(state_dir_path("stopped-sha", opts)))
312 finish_rebase(opts);
313 } else if (status == 2) {
314 struct strbuf dir = STRBUF_INIT;
315 apply_autostash();
317 strbuf_addstr(&dir, opts->state_dir);
318 remove_dir_recursively(&dir, 0);
319 strbuf_release(&dir);
320 die("Nothing to do");
321 }
322 strbuf_release(&script_snippet);
324 return status ? -1 : 0;
326}
327#define GIT_REFLOG_ACTION_ENVIRONMENT "GIT_REFLOG_ACTION"
329static int reset_head(struct object_id *oid, const char *action,
331 const char *switch_to_branch, int detach_head)
332{
333 struct object_id head_oid;
334 struct tree_desc desc;
335 struct lock_file lock = LOCK_INIT;
336 struct unpack_trees_options unpack_tree_opts;
337 struct tree *tree;
338 const char *reflog_action;
339 struct strbuf msg = STRBUF_INIT;
340 size_t prefix_len;
341 struct object_id *orig = NULL, oid_orig,
342 *old_orig = NULL, oid_old_orig;
343 int ret = 0;
344 if (switch_to_branch && !starts_with(switch_to_branch, "refs/"))
346 BUG("Not a fully qualified branch: '%s'", switch_to_branch);
347 if (hold_locked_index(&lock, LOCK_REPORT_ON_ERROR) < 0)
349 return -1;
350 if (!oid) {
352 if (get_oid("HEAD", &head_oid)) {
353 rollback_lock_file(&lock);
354 return error(_("could not determine HEAD revision"));
355 }
356 oid = &head_oid;
357 }
358 memset(&unpack_tree_opts, 0, sizeof(unpack_tree_opts));
360 setup_unpack_trees_porcelain(&unpack_tree_opts, action);
361 unpack_tree_opts.head_idx = 1;
362 unpack_tree_opts.src_index = the_repository->index;
363 unpack_tree_opts.dst_index = the_repository->index;
364 unpack_tree_opts.fn = oneway_merge;
365 unpack_tree_opts.update = 1;
366 unpack_tree_opts.merge = 1;
367 if (!detach_head)
368 unpack_tree_opts.reset = 1;
369 if (read_index_unmerged(the_repository->index) < 0) {
371 rollback_lock_file(&lock);
372 return error(_("could not read index"));
373 }
374 if (!fill_tree_descriptor(&desc, oid)) {
376 error(_("failed to find tree of %s"), oid_to_hex(oid));
377 rollback_lock_file(&lock);
378 free((void *)desc.buffer);
379 return -1;
380 }
381 if (unpack_trees(1, &desc, &unpack_tree_opts)) {
383 rollback_lock_file(&lock);
384 free((void *)desc.buffer);
385 return -1;
386 }
387 tree = parse_tree_indirect(oid);
389 prime_cache_tree(the_repository->index, tree);
390 if (write_locked_index(the_repository->index, &lock, COMMIT_LOCK) < 0)
392 ret = error(_("could not write index"));
393 free((void *)desc.buffer);
394 if (ret)
396 return ret;
397 reflog_action = getenv(GIT_REFLOG_ACTION_ENVIRONMENT);
399 strbuf_addf(&msg, "%s: ", reflog_action ? reflog_action : "rebase");
400 prefix_len = msg.len;
401 if (!get_oid("ORIG_HEAD", &oid_old_orig))
403 old_orig = &oid_old_orig;
404 if (!get_oid("HEAD", &oid_orig)) {
405 orig = &oid_orig;
406 strbuf_addstr(&msg, "updating ORIG_HEAD");
407 update_ref(msg.buf, "ORIG_HEAD", orig, old_orig, 0,
408 UPDATE_REFS_MSG_ON_ERR);
409 } else if (old_orig)
410 delete_ref(NULL, "ORIG_HEAD", old_orig, 0);
411 strbuf_setlen(&msg, prefix_len);
412 strbuf_addstr(&msg, "updating HEAD");
413 if (!switch_to_branch)
414 ret = update_ref(msg.buf, "HEAD", oid, orig, REF_NO_DEREF,
415 UPDATE_REFS_MSG_ON_ERR);
416 else {
417 ret = create_symref("HEAD", switch_to_branch, msg.buf);
418 if (!ret)
419 ret = update_ref(msg.buf, "HEAD", oid, NULL, 0,
420 UPDATE_REFS_MSG_ON_ERR);
421 }
422 strbuf_release(&msg);
424 return ret;
425}
426static int rebase_config(const char *var, const char *value, void *data)
428{
429 struct rebase_options *opts = data;
430 if (!strcmp(var, "rebase.stat")) {
432 if (git_config_bool(var, value))
433 opts->flags |= REBASE_DIFFSTAT;
434 else
435 opts->flags &= !REBASE_DIFFSTAT;
436 return 0;
437 }
438 return git_default_config(var, value, data);
440}
441/*
443 * Determines whether the commits in from..to are linear, i.e. contain
444 * no merge commits. This function *expects* `from` to be an ancestor of
445 * `to`.
446 */
447static int is_linear_history(struct commit *from, struct commit *to)
448{
449 while (to && to != from) {
450 parse_commit(to);
451 if (!to->parents)
452 return 1;
453 if (to->parents->next)
454 return 0;
455 to = to->parents->item;
456 }
457 return 1;
458}
459static int can_fast_forward(struct commit *onto, struct object_id *head_oid,
461 struct object_id *merge_base)
462{
463 struct commit *head = lookup_commit(the_repository, head_oid);
464 struct commit_list *merge_bases;
465 int res;
466 if (!head)
468 return 0;
469 merge_bases = get_merge_bases(onto, head);
471 if (merge_bases && !merge_bases->next) {
472 oidcpy(merge_base, &merge_bases->item->object.oid);
473 res = !oidcmp(merge_base, &onto->object.oid);
474 } else {
475 oidcpy(merge_base, &null_oid);
476 res = 0;
477 }
478 free_commit_list(merge_bases);
479 return res && is_linear_history(onto, head);
480}
481/* -i followed by -m is still -i */
483static int parse_opt_merge(const struct option *opt, const char *arg, int unset)
484{
485 struct rebase_options *opts = opt->value;
486 if (!is_interactive(opts))
488 opts->type = REBASE_MERGE;
489 return 0;
491}
492/* -i followed by -p is still explicitly interactive, but -p alone is not */
494static int parse_opt_interactive(const struct option *opt, const char *arg,
495 int unset)
496{
497 struct rebase_options *opts = opt->value;
498 opts->type = REBASE_INTERACTIVE;
500 opts->flags |= REBASE_INTERACTIVE_EXPLICIT;
501 return 0;
503}
504int cmd_rebase(int argc, const char **argv, const char *prefix)
506{
507 struct rebase_options options = {
508 .type = REBASE_UNSPECIFIED,
509 .flags = REBASE_NO_QUIET,
510 .git_am_opt = STRBUF_INIT,
511 .allow_rerere_autoupdate = -1,
512 };
513 const char *branch_name;
514 int ret, flags, total_argc, in_progress = 0;
515 int ok_to_skip_pre_rebase = 0;
516 struct strbuf msg = STRBUF_INIT;
517 struct strbuf revisions = STRBUF_INIT;
518 struct strbuf buf = STRBUF_INIT;
519 struct object_id merge_base;
520 enum {
521 NO_ACTION,
522 ACTION_CONTINUE,
523 ACTION_SKIP,
524 ACTION_ABORT,
525 ACTION_QUIT,
526 ACTION_EDIT_TODO,
527 ACTION_SHOW_CURRENT_PATCH,
528 } action = NO_ACTION;
529 int committer_date_is_author_date = 0;
530 int ignore_whitespace = 0;
531 struct option builtin_rebase_options[] = {
532 OPT_STRING(0, "onto", &options.onto_name,
533 N_("revision"),
534 N_("rebase onto given branch instead of upstream")),
535 OPT_BOOL(0, "no-verify", &ok_to_skip_pre_rebase,
536 N_("allow pre-rebase hook to run")),
537 OPT_NEGBIT('q', "quiet", &options.flags,
538 N_("be quiet. implies --no-stat"),
539 REBASE_NO_QUIET| REBASE_VERBOSE | REBASE_DIFFSTAT),
540 OPT_BIT('v', "verbose", &options.flags,
541 N_("display a diffstat of what changed upstream"),
542 REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT),
543 {OPTION_NEGBIT, 'n', "no-stat", &options.flags, NULL,
544 N_("do not show diffstat of what changed upstream"),
545 PARSE_OPT_NOARG, NULL, REBASE_DIFFSTAT },
546 OPT_BOOL(0, "ignore-whitespace", &ignore_whitespace,
547 N_("passed to 'git apply'")),
548 OPT_BOOL(0, "signoff", &options.signoff,
549 N_("add a Signed-off-by: line to each commit")),
550 OPT_BOOL(0, "committer-date-is-author-date",
551 &committer_date_is_author_date,
552 N_("passed to 'git am'")),
553 OPT_BIT('f', "force-rebase", &options.flags,
554 N_("cherry-pick all commits, even if unchanged"),
555 REBASE_FORCE),
556 OPT_BIT(0, "no-ff", &options.flags,
557 N_("cherry-pick all commits, even if unchanged"),
558 REBASE_FORCE),
559 OPT_CMDMODE(0, "continue", &action, N_("continue"),
560 ACTION_CONTINUE),
561 OPT_CMDMODE(0, "skip", &action,
562 N_("skip current patch and continue"), ACTION_SKIP),
563 OPT_CMDMODE(0, "abort", &action,
564 N_("abort and check out the original branch"),
565 ACTION_ABORT),
566 OPT_CMDMODE(0, "quit", &action,
567 N_("abort but keep HEAD where it is"), ACTION_QUIT),
568 OPT_CMDMODE(0, "edit-todo", &action, N_("edit the todo list "
569 "during an interactive rebase"), ACTION_EDIT_TODO),
570 OPT_CMDMODE(0, "show-current-patch", &action,
571 N_("show the patch file being applied or merged"),
572 ACTION_SHOW_CURRENT_PATCH),
573 { OPTION_CALLBACK, 'm', "merge", &options, NULL,
574 N_("use merging strategies to rebase"),
575 PARSE_OPT_NOARG | PARSE_OPT_NONEG,
576 parse_opt_merge },
577 { OPTION_CALLBACK, 'i', "interactive", &options, NULL,
578 N_("let the user edit the list of commits to rebase"),
579 PARSE_OPT_NOARG | PARSE_OPT_NONEG,
580 parse_opt_interactive },
581 OPT_SET_INT('p', "preserve-merges", &options.type,
582 N_("try to recreate merges instead of ignoring "
583 "them"), REBASE_PRESERVE_MERGES),
584 OPT_BOOL(0, "rerere-autoupdate",
585 &options.allow_rerere_autoupdate,
586 N_("allow rerere to update index with resolved "
587 "conflict")),
588 OPT_END(),
589 };
590 /*
592 * NEEDSWORK: Once the builtin rebase has been tested enough
593 * and git-legacy-rebase.sh is retired to contrib/, this preamble
594 * can be removed.
595 */
596 if (!use_builtin_rebase()) {
598 const char *path = mkpath("%s/git-legacy-rebase",
599 git_exec_path());
600 if (sane_execvp(path, (char **)argv) < 0)
602 die_errno(_("could not exec %s"), path);
603 else
604 BUG("sane_execvp() returned???");
605 }
606 if (argc == 2 && !strcmp(argv[1], "-h"))
608 usage_with_options(builtin_rebase_usage,
609 builtin_rebase_options);
610 prefix = setup_git_directory();
612 trace_repo_setup(prefix);
613 setup_work_tree();
614 git_config(rebase_config, &options);
616 strbuf_reset(&buf);
618 strbuf_addf(&buf, "%s/applying", apply_dir());
619 if(file_exists(buf.buf))
620 die(_("It looks like 'git am' is in progress. Cannot rebase."));
621 if (is_directory(apply_dir())) {
623 options.type = REBASE_AM;
624 options.state_dir = apply_dir();
625 } else if (is_directory(merge_dir())) {
626 strbuf_reset(&buf);
627 strbuf_addf(&buf, "%s/rewritten", merge_dir());
628 if (is_directory(buf.buf)) {
629 options.type = REBASE_PRESERVE_MERGES;
630 options.flags |= REBASE_INTERACTIVE_EXPLICIT;
631 } else {
632 strbuf_reset(&buf);
633 strbuf_addf(&buf, "%s/interactive", merge_dir());
634 if(file_exists(buf.buf)) {
635 options.type = REBASE_INTERACTIVE;
636 options.flags |= REBASE_INTERACTIVE_EXPLICIT;
637 } else
638 options.type = REBASE_MERGE;
639 }
640 options.state_dir = merge_dir();
641 }
642 if (options.type != REBASE_UNSPECIFIED)
644 in_progress = 1;
645 total_argc = argc;
647 argc = parse_options(argc, argv, prefix,
648 builtin_rebase_options,
649 builtin_rebase_usage, 0);
650 if (action != NO_ACTION && total_argc != 2) {
652 usage_with_options(builtin_rebase_usage,
653 builtin_rebase_options);
654 }
655 if (argc > 2)
657 usage_with_options(builtin_rebase_usage,
658 builtin_rebase_options);
659 if (action != NO_ACTION && !in_progress)
661 die(_("No rebase in progress?"));
662 if (action == ACTION_EDIT_TODO && !is_interactive(&options))
664 die(_("The --edit-todo action can only be used during "
665 "interactive rebase."));
666 switch (action) {
668 case ACTION_CONTINUE: {
669 struct object_id head;
670 struct lock_file lock_file = LOCK_INIT;
671 int fd;
672 options.action = "continue";
674 /* Sanity check */
676 if (get_oid("HEAD", &head))
677 die(_("Cannot read HEAD"));
678 fd = hold_locked_index(&lock_file, 0);
680 if (read_index(the_repository->index) < 0)
681 die(_("could not read index"));
682 refresh_index(the_repository->index, REFRESH_QUIET, NULL, NULL,
683 NULL);
684 if (0 <= fd)
685 update_index_if_able(the_repository->index,
686 &lock_file);
687 rollback_lock_file(&lock_file);
688 if (has_unstaged_changes(1)) {
690 puts(_("You must edit all merge conflicts and then\n"
691 "mark them as resolved using git add"));
692 exit(1);
693 }
694 if (read_basic_state(&options))
695 exit(1);
696 goto run_rebase;
697 }
698 case ACTION_SKIP: {
699 struct string_list merge_rr = STRING_LIST_INIT_DUP;
700 options.action = "skip";
702 rerere_clear(&merge_rr);
704 string_list_clear(&merge_rr, 1);
705 if (reset_head(NULL, "reset", NULL, 0) < 0)
707 die(_("could not discard worktree changes"));
708 if (read_basic_state(&options))
709 exit(1);
710 goto run_rebase;
711 }
712 case ACTION_ABORT: {
713 struct string_list merge_rr = STRING_LIST_INIT_DUP;
714 options.action = "abort";
715 rerere_clear(&merge_rr);
717 string_list_clear(&merge_rr, 1);
718 if (read_basic_state(&options))
720 exit(1);
721 if (reset_head(&options.orig_head, "reset",
722 options.head_name, 0) < 0)
723 die(_("could not move back to %s"),
724 oid_to_hex(&options.orig_head));
725 ret = finish_rebase(&options);
726 goto cleanup;
727 }
728 case ACTION_QUIT: {
729 strbuf_reset(&buf);
730 strbuf_addstr(&buf, options.state_dir);
731 ret = !!remove_dir_recursively(&buf, 0);
732 if (ret)
733 die(_("could not remove '%s'"), options.state_dir);
734 goto cleanup;
735 }
736 case ACTION_EDIT_TODO:
737 options.action = "edit-todo";
738 options.dont_finish_rebase = 1;
739 goto run_rebase;
740 case ACTION_SHOW_CURRENT_PATCH:
741 options.action = "show-current-patch";
742 options.dont_finish_rebase = 1;
743 goto run_rebase;
744 case NO_ACTION:
745 break;
746 default:
747 BUG("action: %d", action);
748 }
749 /* Make sure no rebase is in progress */
751 if (in_progress) {
752 const char *last_slash = strrchr(options.state_dir, '/');
753 const char *state_dir_base =
754 last_slash ? last_slash + 1 : options.state_dir;
755 const char *cmd_live_rebase =
756 "git rebase (--continue | --abort | --skip)";
757 strbuf_reset(&buf);
758 strbuf_addf(&buf, "rm -fr \"%s\"", options.state_dir);
759 die(_("It seems that there is already a %s directory, and\n"
760 "I wonder if you are in the middle of another rebase. "
761 "If that is the\n"
762 "case, please try\n\t%s\n"
763 "If that is not the case, please\n\t%s\n"
764 "and run me again. I am stopping in case you still "
765 "have something\n"
766 "valuable there.\n"),
767 state_dir_base, cmd_live_rebase, buf.buf);
768 }
769 if (!(options.flags & REBASE_NO_QUIET))
771 strbuf_addstr(&options.git_am_opt, " -q");
772 if (committer_date_is_author_date) {
774 strbuf_addstr(&options.git_am_opt,
775 " --committer-date-is-author-date");
776 options.flags |= REBASE_FORCE;
777 }
778 if (ignore_whitespace)
780 strbuf_addstr(&options.git_am_opt, " --ignore-whitespace");
781 switch (options.type) {
783 case REBASE_MERGE:
784 case REBASE_INTERACTIVE:
785 case REBASE_PRESERVE_MERGES:
786 options.state_dir = merge_dir();
787 break;
788 case REBASE_AM:
789 options.state_dir = apply_dir();
790 break;
791 default:
792 /* the default rebase backend is `--am` */
793 options.type = REBASE_AM;
794 options.state_dir = apply_dir();
795 break;
796 }
797 if (options.signoff) {
799 if (options.type == REBASE_PRESERVE_MERGES)
800 die("cannot combine '--signoff' with "
801 "'--preserve-merges'");
802 strbuf_addstr(&options.git_am_opt, " --signoff");
803 options.flags |= REBASE_FORCE;
804 }
805 if (!options.root) {
807 if (argc < 1)
808 die("TODO: handle @{upstream}");
809 else {
810 options.upstream_name = argv[0];
811 argc--;
812 argv++;
813 if (!strcmp(options.upstream_name, "-"))
814 options.upstream_name = "@{-1}";
815 }
816 options.upstream = peel_committish(options.upstream_name);
817 if (!options.upstream)
818 die(_("invalid upstream '%s'"), options.upstream_name);
819 options.upstream_arg = options.upstream_name;
820 } else
821 die("TODO: upstream for --root");
822 /* Make sure the branch to rebase onto is valid. */
824 if (!options.onto_name)
825 options.onto_name = options.upstream_name;
826 if (strstr(options.onto_name, "...")) {
827 if (get_oid_mb(options.onto_name, &merge_base) < 0)
828 die(_("'%s': need exactly one merge base"),
829 options.onto_name);
830 options.onto = lookup_commit_or_die(&merge_base,
831 options.onto_name);
832 } else {
833 options.onto = peel_committish(options.onto_name);
834 if (!options.onto)
835 die(_("Does not point to a valid commit '%s'"),
836 options.onto_name);
837 }
838 /*
840 * If the branch to rebase is given, that is the branch we will rebase
841 * branch_name -- branch/commit being rebased, or
842 * HEAD (already detached)
843 * orig_head -- commit object name of tip of the branch before rebasing
844 * head_name -- refs/heads/<that-branch> or NULL (detached HEAD)
845 */
846 if (argc == 1) {
847 /* Is it "rebase other branchname" or "rebase other commit"? */
848 branch_name = argv[0];
849 options.switch_to = argv[0];
850 /* Is it a local branch? */
852 strbuf_reset(&buf);
853 strbuf_addf(&buf, "refs/heads/%s", branch_name);
854 if (!read_ref(buf.buf, &options.orig_head))
855 options.head_name = xstrdup(buf.buf);
856 /* If not is it a valid ref (branch or commit)? */
857 else if (!get_oid(branch_name, &options.orig_head))
858 options.head_name = NULL;
859 else
860 die(_("fatal: no such branch/commit '%s'"),
861 branch_name);
862 } else if (argc == 0) {
863 /* Do not need to switch branches, we are already on it. */
864 options.head_name =
865 xstrdup_or_null(resolve_ref_unsafe("HEAD", 0, NULL,
866 &flags));
867 if (!options.head_name)
868 die(_("No such ref: %s"), "HEAD");
869 if (flags & REF_ISSYMREF) {
870 if (!skip_prefix(options.head_name,
871 "refs/heads/", &branch_name))
872 branch_name = options.head_name;
873 } else {
875 free(options.head_name);
876 options.head_name = NULL;
877 branch_name = "HEAD";
878 }
879 if (get_oid("HEAD", &options.orig_head))
880 die(_("Could not resolve HEAD to a revision"));
881 } else
882 BUG("unexpected number of arguments left to parse");
883 if (read_index(the_repository->index) < 0)
885 die(_("could not read index"));
886 if (require_clean_work_tree("rebase",
888 _("Please commit or stash them."), 1, 1)) {
889 ret = 1;
890 goto cleanup;
891 }
892 /*
894 * Now we are rebasing commits upstream..orig_head (or with --root,
895 * everything leading up to orig_head) on top of onto.
896 */
897 /*
899 * Check if we are already based on onto with linear history,
900 * but this should be done only when upstream and onto are the same
901 * and if this is not an interactive rebase.
902 */
903 if (can_fast_forward(options.onto, &options.orig_head, &merge_base) &&
904 !is_interactive(&options) && !options.restrict_revision &&
905 !oidcmp(&options.upstream->object.oid, &options.onto->object.oid)) {
906 int flag;
907 if (!(options.flags & REBASE_FORCE)) {
909 /* Lazily switch to the target branch if needed... */
910 if (options.switch_to) {
911 struct object_id oid;
912 if (get_oid(options.switch_to, &oid) < 0) {
914 ret = !!error(_("could not parse '%s'"),
915 options.switch_to);
916 goto cleanup;
917 }
918 strbuf_reset(&buf);
920 strbuf_addf(&buf, "rebase: checkout %s",
921 options.switch_to);
922 if (reset_head(&oid, "checkout",
923 options.head_name, 0) < 0) {
924 ret = !!error(_("could not switch to "
925 "%s"),
926 options.switch_to);
927 goto cleanup;
928 }
929 }
930 if (!(options.flags & REBASE_NO_QUIET))
932 ; /* be quiet */
933 else if (!strcmp(branch_name, "HEAD") &&
934 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
935 puts(_("HEAD is up to date."));
936 else
937 printf(_("Current branch %s is up to date.\n"),
938 branch_name);
939 ret = !!finish_rebase(&options);
940 goto cleanup;
941 } else if (!(options.flags & REBASE_NO_QUIET))
942 ; /* be quiet */
943 else if (!strcmp(branch_name, "HEAD") &&
944 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
945 puts(_("HEAD is up to date, rebase forced."));
946 else
947 printf(_("Current branch %s is up to date, rebase "
948 "forced.\n"), branch_name);
949 }
950 /* If a hook exists, give it a chance to interrupt*/
952 if (!ok_to_skip_pre_rebase &&
953 run_hook_le(NULL, "pre-rebase", options.upstream_arg,
954 argc ? argv[0] : NULL, NULL))
955 die(_("The pre-rebase hook refused to rebase."));
956 if (options.flags & REBASE_DIFFSTAT) {
958 struct diff_options opts;
959 if (options.flags & REBASE_VERBOSE)
961 printf(_("Changes from %s to %s:\n"),
962 oid_to_hex(&merge_base),
963 oid_to_hex(&options.onto->object.oid));
964 /* We want color (if set), but no pager */
966 diff_setup(&opts);
967 opts.stat_width = -1; /* use full terminal width */
968 opts.stat_graph_width = -1; /* respect statGraphWidth config */
969 opts.output_format |=
970 DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
971 opts.detect_rename = DIFF_DETECT_RENAME;
972 diff_setup_done(&opts);
973 diff_tree_oid(&merge_base, &options.onto->object.oid,
974 "", &opts);
975 diffcore_std(&opts);
976 diff_flush(&opts);
977 }
978 if (is_interactive(&options))
980 goto run_rebase;
981 /* Detach HEAD and reset the tree */
983 if (options.flags & REBASE_NO_QUIET)
984 printf(_("First, rewinding head to replay your work on top of "
985 "it...\n"));
986 strbuf_addf(&msg, "rebase: checkout %s", options.onto_name);
988 if (reset_head(&options.onto->object.oid, "checkout", NULL, 1))
989 die(_("Could not detach HEAD"));
990 strbuf_release(&msg);
991 strbuf_addf(&revisions, "%s..%s",
993 options.root ? oid_to_hex(&options.onto->object.oid) :
994 (options.restrict_revision ?
995 oid_to_hex(&options.restrict_revision->object.oid) :
996 oid_to_hex(&options.upstream->object.oid)),
997 oid_to_hex(&options.orig_head));
998 options.revisions = revisions.buf;
1000run_rebase:
1002 ret = !!run_specific_rebase(&options);
1003cleanup:
1005 strbuf_release(&revisions);
1006 free(options.head_name);
1007 return ret;
1008}