6ce50eae0f2ea7da89348f40ed5046c18ab8ab29
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 struct option builtin_rebase_options[] = {
531 OPT_STRING(0, "onto", &options.onto_name,
532 N_("revision"),
533 N_("rebase onto given branch instead of upstream")),
534 OPT_BOOL(0, "no-verify", &ok_to_skip_pre_rebase,
535 N_("allow pre-rebase hook to run")),
536 OPT_NEGBIT('q', "quiet", &options.flags,
537 N_("be quiet. implies --no-stat"),
538 REBASE_NO_QUIET| REBASE_VERBOSE | REBASE_DIFFSTAT),
539 OPT_BIT('v', "verbose", &options.flags,
540 N_("display a diffstat of what changed upstream"),
541 REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT),
542 {OPTION_NEGBIT, 'n', "no-stat", &options.flags, NULL,
543 N_("do not show diffstat of what changed upstream"),
544 PARSE_OPT_NOARG, NULL, REBASE_DIFFSTAT },
545 OPT_BOOL(0, "signoff", &options.signoff,
546 N_("add a Signed-off-by: line to each commit")),
547 OPT_BOOL(0, "committer-date-is-author-date",
548 &committer_date_is_author_date,
549 N_("passed to 'git am'")),
550 OPT_BIT('f', "force-rebase", &options.flags,
551 N_("cherry-pick all commits, even if unchanged"),
552 REBASE_FORCE),
553 OPT_BIT(0, "no-ff", &options.flags,
554 N_("cherry-pick all commits, even if unchanged"),
555 REBASE_FORCE),
556 OPT_CMDMODE(0, "continue", &action, N_("continue"),
557 ACTION_CONTINUE),
558 OPT_CMDMODE(0, "skip", &action,
559 N_("skip current patch and continue"), ACTION_SKIP),
560 OPT_CMDMODE(0, "abort", &action,
561 N_("abort and check out the original branch"),
562 ACTION_ABORT),
563 OPT_CMDMODE(0, "quit", &action,
564 N_("abort but keep HEAD where it is"), ACTION_QUIT),
565 OPT_CMDMODE(0, "edit-todo", &action, N_("edit the todo list "
566 "during an interactive rebase"), ACTION_EDIT_TODO),
567 OPT_CMDMODE(0, "show-current-patch", &action,
568 N_("show the patch file being applied or merged"),
569 ACTION_SHOW_CURRENT_PATCH),
570 { OPTION_CALLBACK, 'm', "merge", &options, NULL,
571 N_("use merging strategies to rebase"),
572 PARSE_OPT_NOARG | PARSE_OPT_NONEG,
573 parse_opt_merge },
574 { OPTION_CALLBACK, 'i', "interactive", &options, NULL,
575 N_("let the user edit the list of commits to rebase"),
576 PARSE_OPT_NOARG | PARSE_OPT_NONEG,
577 parse_opt_interactive },
578 OPT_SET_INT('p', "preserve-merges", &options.type,
579 N_("try to recreate merges instead of ignoring "
580 "them"), REBASE_PRESERVE_MERGES),
581 OPT_BOOL(0, "rerere-autoupdate",
582 &options.allow_rerere_autoupdate,
583 N_("allow rerere to update index with resolved "
584 "conflict")),
585 OPT_END(),
586 };
587 /*
589 * NEEDSWORK: Once the builtin rebase has been tested enough
590 * and git-legacy-rebase.sh is retired to contrib/, this preamble
591 * can be removed.
592 */
593 if (!use_builtin_rebase()) {
595 const char *path = mkpath("%s/git-legacy-rebase",
596 git_exec_path());
597 if (sane_execvp(path, (char **)argv) < 0)
599 die_errno(_("could not exec %s"), path);
600 else
601 BUG("sane_execvp() returned???");
602 }
603 if (argc == 2 && !strcmp(argv[1], "-h"))
605 usage_with_options(builtin_rebase_usage,
606 builtin_rebase_options);
607 prefix = setup_git_directory();
609 trace_repo_setup(prefix);
610 setup_work_tree();
611 git_config(rebase_config, &options);
613 strbuf_reset(&buf);
615 strbuf_addf(&buf, "%s/applying", apply_dir());
616 if(file_exists(buf.buf))
617 die(_("It looks like 'git am' is in progress. Cannot rebase."));
618 if (is_directory(apply_dir())) {
620 options.type = REBASE_AM;
621 options.state_dir = apply_dir();
622 } else if (is_directory(merge_dir())) {
623 strbuf_reset(&buf);
624 strbuf_addf(&buf, "%s/rewritten", merge_dir());
625 if (is_directory(buf.buf)) {
626 options.type = REBASE_PRESERVE_MERGES;
627 options.flags |= REBASE_INTERACTIVE_EXPLICIT;
628 } else {
629 strbuf_reset(&buf);
630 strbuf_addf(&buf, "%s/interactive", merge_dir());
631 if(file_exists(buf.buf)) {
632 options.type = REBASE_INTERACTIVE;
633 options.flags |= REBASE_INTERACTIVE_EXPLICIT;
634 } else
635 options.type = REBASE_MERGE;
636 }
637 options.state_dir = merge_dir();
638 }
639 if (options.type != REBASE_UNSPECIFIED)
641 in_progress = 1;
642 total_argc = argc;
644 argc = parse_options(argc, argv, prefix,
645 builtin_rebase_options,
646 builtin_rebase_usage, 0);
647 if (action != NO_ACTION && total_argc != 2) {
649 usage_with_options(builtin_rebase_usage,
650 builtin_rebase_options);
651 }
652 if (argc > 2)
654 usage_with_options(builtin_rebase_usage,
655 builtin_rebase_options);
656 if (action != NO_ACTION && !in_progress)
658 die(_("No rebase in progress?"));
659 if (action == ACTION_EDIT_TODO && !is_interactive(&options))
661 die(_("The --edit-todo action can only be used during "
662 "interactive rebase."));
663 switch (action) {
665 case ACTION_CONTINUE: {
666 struct object_id head;
667 struct lock_file lock_file = LOCK_INIT;
668 int fd;
669 options.action = "continue";
671 /* Sanity check */
673 if (get_oid("HEAD", &head))
674 die(_("Cannot read HEAD"));
675 fd = hold_locked_index(&lock_file, 0);
677 if (read_index(the_repository->index) < 0)
678 die(_("could not read index"));
679 refresh_index(the_repository->index, REFRESH_QUIET, NULL, NULL,
680 NULL);
681 if (0 <= fd)
682 update_index_if_able(the_repository->index,
683 &lock_file);
684 rollback_lock_file(&lock_file);
685 if (has_unstaged_changes(1)) {
687 puts(_("You must edit all merge conflicts and then\n"
688 "mark them as resolved using git add"));
689 exit(1);
690 }
691 if (read_basic_state(&options))
692 exit(1);
693 goto run_rebase;
694 }
695 case ACTION_SKIP: {
696 struct string_list merge_rr = STRING_LIST_INIT_DUP;
697 options.action = "skip";
699 rerere_clear(&merge_rr);
701 string_list_clear(&merge_rr, 1);
702 if (reset_head(NULL, "reset", NULL, 0) < 0)
704 die(_("could not discard worktree changes"));
705 if (read_basic_state(&options))
706 exit(1);
707 goto run_rebase;
708 }
709 case ACTION_ABORT: {
710 struct string_list merge_rr = STRING_LIST_INIT_DUP;
711 options.action = "abort";
712 rerere_clear(&merge_rr);
714 string_list_clear(&merge_rr, 1);
715 if (read_basic_state(&options))
717 exit(1);
718 if (reset_head(&options.orig_head, "reset",
719 options.head_name, 0) < 0)
720 die(_("could not move back to %s"),
721 oid_to_hex(&options.orig_head));
722 ret = finish_rebase(&options);
723 goto cleanup;
724 }
725 case ACTION_QUIT: {
726 strbuf_reset(&buf);
727 strbuf_addstr(&buf, options.state_dir);
728 ret = !!remove_dir_recursively(&buf, 0);
729 if (ret)
730 die(_("could not remove '%s'"), options.state_dir);
731 goto cleanup;
732 }
733 case ACTION_EDIT_TODO:
734 options.action = "edit-todo";
735 options.dont_finish_rebase = 1;
736 goto run_rebase;
737 case ACTION_SHOW_CURRENT_PATCH:
738 options.action = "show-current-patch";
739 options.dont_finish_rebase = 1;
740 goto run_rebase;
741 case NO_ACTION:
742 break;
743 default:
744 BUG("action: %d", action);
745 }
746 /* Make sure no rebase is in progress */
748 if (in_progress) {
749 const char *last_slash = strrchr(options.state_dir, '/');
750 const char *state_dir_base =
751 last_slash ? last_slash + 1 : options.state_dir;
752 const char *cmd_live_rebase =
753 "git rebase (--continue | --abort | --skip)";
754 strbuf_reset(&buf);
755 strbuf_addf(&buf, "rm -fr \"%s\"", options.state_dir);
756 die(_("It seems that there is already a %s directory, and\n"
757 "I wonder if you are in the middle of another rebase. "
758 "If that is the\n"
759 "case, please try\n\t%s\n"
760 "If that is not the case, please\n\t%s\n"
761 "and run me again. I am stopping in case you still "
762 "have something\n"
763 "valuable there.\n"),
764 state_dir_base, cmd_live_rebase, buf.buf);
765 }
766 if (!(options.flags & REBASE_NO_QUIET))
768 strbuf_addstr(&options.git_am_opt, " -q");
769 if (committer_date_is_author_date) {
771 strbuf_addstr(&options.git_am_opt,
772 " --committer-date-is-author-date");
773 options.flags |= REBASE_FORCE;
774 }
775 switch (options.type) {
777 case REBASE_MERGE:
778 case REBASE_INTERACTIVE:
779 case REBASE_PRESERVE_MERGES:
780 options.state_dir = merge_dir();
781 break;
782 case REBASE_AM:
783 options.state_dir = apply_dir();
784 break;
785 default:
786 /* the default rebase backend is `--am` */
787 options.type = REBASE_AM;
788 options.state_dir = apply_dir();
789 break;
790 }
791 if (options.signoff) {
793 if (options.type == REBASE_PRESERVE_MERGES)
794 die("cannot combine '--signoff' with "
795 "'--preserve-merges'");
796 strbuf_addstr(&options.git_am_opt, " --signoff");
797 options.flags |= REBASE_FORCE;
798 }
799 if (!options.root) {
801 if (argc < 1)
802 die("TODO: handle @{upstream}");
803 else {
804 options.upstream_name = argv[0];
805 argc--;
806 argv++;
807 if (!strcmp(options.upstream_name, "-"))
808 options.upstream_name = "@{-1}";
809 }
810 options.upstream = peel_committish(options.upstream_name);
811 if (!options.upstream)
812 die(_("invalid upstream '%s'"), options.upstream_name);
813 options.upstream_arg = options.upstream_name;
814 } else
815 die("TODO: upstream for --root");
816 /* Make sure the branch to rebase onto is valid. */
818 if (!options.onto_name)
819 options.onto_name = options.upstream_name;
820 if (strstr(options.onto_name, "...")) {
821 if (get_oid_mb(options.onto_name, &merge_base) < 0)
822 die(_("'%s': need exactly one merge base"),
823 options.onto_name);
824 options.onto = lookup_commit_or_die(&merge_base,
825 options.onto_name);
826 } else {
827 options.onto = peel_committish(options.onto_name);
828 if (!options.onto)
829 die(_("Does not point to a valid commit '%s'"),
830 options.onto_name);
831 }
832 /*
834 * If the branch to rebase is given, that is the branch we will rebase
835 * branch_name -- branch/commit being rebased, or
836 * HEAD (already detached)
837 * orig_head -- commit object name of tip of the branch before rebasing
838 * head_name -- refs/heads/<that-branch> or NULL (detached HEAD)
839 */
840 if (argc == 1) {
841 /* Is it "rebase other branchname" or "rebase other commit"? */
842 branch_name = argv[0];
843 options.switch_to = argv[0];
844 /* Is it a local branch? */
846 strbuf_reset(&buf);
847 strbuf_addf(&buf, "refs/heads/%s", branch_name);
848 if (!read_ref(buf.buf, &options.orig_head))
849 options.head_name = xstrdup(buf.buf);
850 /* If not is it a valid ref (branch or commit)? */
851 else if (!get_oid(branch_name, &options.orig_head))
852 options.head_name = NULL;
853 else
854 die(_("fatal: no such branch/commit '%s'"),
855 branch_name);
856 } else if (argc == 0) {
857 /* Do not need to switch branches, we are already on it. */
858 options.head_name =
859 xstrdup_or_null(resolve_ref_unsafe("HEAD", 0, NULL,
860 &flags));
861 if (!options.head_name)
862 die(_("No such ref: %s"), "HEAD");
863 if (flags & REF_ISSYMREF) {
864 if (!skip_prefix(options.head_name,
865 "refs/heads/", &branch_name))
866 branch_name = options.head_name;
867 } else {
869 free(options.head_name);
870 options.head_name = NULL;
871 branch_name = "HEAD";
872 }
873 if (get_oid("HEAD", &options.orig_head))
874 die(_("Could not resolve HEAD to a revision"));
875 } else
876 BUG("unexpected number of arguments left to parse");
877 if (read_index(the_repository->index) < 0)
879 die(_("could not read index"));
880 if (require_clean_work_tree("rebase",
882 _("Please commit or stash them."), 1, 1)) {
883 ret = 1;
884 goto cleanup;
885 }
886 /*
888 * Now we are rebasing commits upstream..orig_head (or with --root,
889 * everything leading up to orig_head) on top of onto.
890 */
891 /*
893 * Check if we are already based on onto with linear history,
894 * but this should be done only when upstream and onto are the same
895 * and if this is not an interactive rebase.
896 */
897 if (can_fast_forward(options.onto, &options.orig_head, &merge_base) &&
898 !is_interactive(&options) && !options.restrict_revision &&
899 !oidcmp(&options.upstream->object.oid, &options.onto->object.oid)) {
900 int flag;
901 if (!(options.flags & REBASE_FORCE)) {
903 /* Lazily switch to the target branch if needed... */
904 if (options.switch_to) {
905 struct object_id oid;
906 if (get_oid(options.switch_to, &oid) < 0) {
908 ret = !!error(_("could not parse '%s'"),
909 options.switch_to);
910 goto cleanup;
911 }
912 strbuf_reset(&buf);
914 strbuf_addf(&buf, "rebase: checkout %s",
915 options.switch_to);
916 if (reset_head(&oid, "checkout",
917 options.head_name, 0) < 0) {
918 ret = !!error(_("could not switch to "
919 "%s"),
920 options.switch_to);
921 goto cleanup;
922 }
923 }
924 if (!(options.flags & REBASE_NO_QUIET))
926 ; /* be quiet */
927 else if (!strcmp(branch_name, "HEAD") &&
928 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
929 puts(_("HEAD is up to date."));
930 else
931 printf(_("Current branch %s is up to date.\n"),
932 branch_name);
933 ret = !!finish_rebase(&options);
934 goto cleanup;
935 } else if (!(options.flags & REBASE_NO_QUIET))
936 ; /* be quiet */
937 else if (!strcmp(branch_name, "HEAD") &&
938 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
939 puts(_("HEAD is up to date, rebase forced."));
940 else
941 printf(_("Current branch %s is up to date, rebase "
942 "forced.\n"), branch_name);
943 }
944 /* If a hook exists, give it a chance to interrupt*/
946 if (!ok_to_skip_pre_rebase &&
947 run_hook_le(NULL, "pre-rebase", options.upstream_arg,
948 argc ? argv[0] : NULL, NULL))
949 die(_("The pre-rebase hook refused to rebase."));
950 if (options.flags & REBASE_DIFFSTAT) {
952 struct diff_options opts;
953 if (options.flags & REBASE_VERBOSE)
955 printf(_("Changes from %s to %s:\n"),
956 oid_to_hex(&merge_base),
957 oid_to_hex(&options.onto->object.oid));
958 /* We want color (if set), but no pager */
960 diff_setup(&opts);
961 opts.stat_width = -1; /* use full terminal width */
962 opts.stat_graph_width = -1; /* respect statGraphWidth config */
963 opts.output_format |=
964 DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
965 opts.detect_rename = DIFF_DETECT_RENAME;
966 diff_setup_done(&opts);
967 diff_tree_oid(&merge_base, &options.onto->object.oid,
968 "", &opts);
969 diffcore_std(&opts);
970 diff_flush(&opts);
971 }
972 if (is_interactive(&options))
974 goto run_rebase;
975 /* Detach HEAD and reset the tree */
977 if (options.flags & REBASE_NO_QUIET)
978 printf(_("First, rewinding head to replay your work on top of "
979 "it...\n"));
980 strbuf_addf(&msg, "rebase: checkout %s", options.onto_name);
982 if (reset_head(&options.onto->object.oid, "checkout", NULL, 1))
983 die(_("Could not detach HEAD"));
984 strbuf_release(&msg);
985 strbuf_addf(&revisions, "%s..%s",
987 options.root ? oid_to_hex(&options.onto->object.oid) :
988 (options.restrict_revision ?
989 oid_to_hex(&options.restrict_revision->object.oid) :
990 oid_to_hex(&options.upstream->object.oid)),
991 oid_to_hex(&options.orig_head));
992 options.revisions = revisions.buf;
994run_rebase:
996 ret = !!run_specific_rebase(&options);
997cleanup:
999 strbuf_release(&revisions);
1000 free(options.head_name);
1001 return ret;
1002}