1/*
2 * "git rebase" builtin command
3 *
4 * Copyright (c) 2018 Pratik Karki
5 */
6#define USE_THE_INDEX_COMPATIBILITY_MACROS
8#include "builtin.h"
9#include "run-command.h"
10#include "exec-cmd.h"
11#include "argv-array.h"
12#include "dir.h"
13#include "packfile.h"
14#include "refs.h"
15#include "quote.h"
16#include "config.h"
17#include "cache-tree.h"
18#include "unpack-trees.h"
19#include "lockfile.h"
20#include "parse-options.h"
21#include "commit.h"
22#include "diff.h"
23#include "wt-status.h"
24#include "revision.h"
25#include "commit-reach.h"
26#include "rerere.h"
27#include "branch.h"
28#include "sequencer.h"
29#include "rebase-interactive.h"
30static char const * const builtin_rebase_usage[] = {
32 N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] "
33 "[<upstream>] [<branch>]"),
34 N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] "
35 "--root [<branch>]"),
36 N_("git rebase --continue | --abort | --skip | --edit-todo"),
37 NULL
38};
39static GIT_PATH_FUNC(path_squash_onto, "rebase-merge/squash-onto")
41static GIT_PATH_FUNC(path_interactive, "rebase-merge/interactive")
42static GIT_PATH_FUNC(apply_dir, "rebase-apply")
43static GIT_PATH_FUNC(merge_dir, "rebase-merge")
44enum rebase_type {
46 REBASE_UNSPECIFIED = -1,
47 REBASE_AM,
48 REBASE_MERGE,
49 REBASE_INTERACTIVE,
50 REBASE_PRESERVE_MERGES
51};
52struct rebase_options {
54 enum rebase_type type;
55 const char *state_dir;
56 struct commit *upstream;
57 const char *upstream_name;
58 const char *upstream_arg;
59 char *head_name;
60 struct object_id orig_head;
61 struct commit *onto;
62 const char *onto_name;
63 const char *revisions;
64 const char *switch_to;
65 int root;
66 struct object_id *squash_onto;
67 struct commit *restrict_revision;
68 int dont_finish_rebase;
69 enum {
70 REBASE_NO_QUIET = 1<<0,
71 REBASE_VERBOSE = 1<<1,
72 REBASE_DIFFSTAT = 1<<2,
73 REBASE_FORCE = 1<<3,
74 REBASE_INTERACTIVE_EXPLICIT = 1<<4,
75 } flags;
76 struct argv_array git_am_opts;
77 const char *action;
78 int signoff;
79 int allow_rerere_autoupdate;
80 int keep_empty;
81 int autosquash;
82 char *gpg_sign_opt;
83 int autostash;
84 char *cmd;
85 int allow_empty_message;
86 int rebase_merges, rebase_cousins;
87 char *strategy, *strategy_opts;
88 struct strbuf git_format_patch_opt;
89 int reschedule_failed_exec;
90};
91#define REBASE_OPTIONS_INIT { \
93 .type = REBASE_UNSPECIFIED, \
94 .flags = REBASE_NO_QUIET, \
95 .git_am_opts = ARGV_ARRAY_INIT, \
96 .git_format_patch_opt = STRBUF_INIT \
97 }
98static struct replay_opts get_replay_opts(const struct rebase_options *opts)
100{
101 struct replay_opts replay = REPLAY_OPTS_INIT;
102 replay.action = REPLAY_INTERACTIVE_REBASE;
104 sequencer_init_config(&replay);
105 replay.signoff = opts->signoff;
107 replay.allow_ff = !(opts->flags & REBASE_FORCE);
108 if (opts->allow_rerere_autoupdate)
109 replay.allow_rerere_auto = opts->allow_rerere_autoupdate;
110 replay.allow_empty = 1;
111 replay.allow_empty_message = opts->allow_empty_message;
112 replay.verbose = opts->flags & REBASE_VERBOSE;
113 replay.reschedule_failed_exec = opts->reschedule_failed_exec;
114 replay.gpg_sign = xstrdup_or_null(opts->gpg_sign_opt);
115 replay.strategy = opts->strategy;
116 if (opts->strategy_opts)
117 parse_strategy_opts(&replay, opts->strategy_opts);
118 return replay;
120}
121enum action {
123 ACTION_NONE = 0,
124 ACTION_CONTINUE,
125 ACTION_SKIP,
126 ACTION_ABORT,
127 ACTION_QUIT,
128 ACTION_EDIT_TODO,
129 ACTION_SHOW_CURRENT_PATCH,
130 ACTION_SHORTEN_OIDS,
131 ACTION_EXPAND_OIDS,
132 ACTION_CHECK_TODO_LIST,
133 ACTION_REARRANGE_SQUASH,
134 ACTION_ADD_EXEC
135};
136static const char *action_names[] = { "undefined",
138 "continue",
139 "skip",
140 "abort",
141 "quit",
142 "edit_todo",
143 "show_current_patch" };
144static int add_exec_commands(struct string_list *commands)
146{
147 const char *todo_file = rebase_path_todo();
148 struct todo_list todo_list = TODO_LIST_INIT;
149 int res;
150 if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
152 return error_errno(_("could not read '%s'."), todo_file);
153 if (todo_list_parse_insn_buffer(the_repository, todo_list.buf.buf,
155 &todo_list)) {
156 todo_list_release(&todo_list);
157 return error(_("unusable todo list: '%s'"), todo_file);
158 }
159 todo_list_add_exec_commands(&todo_list, commands);
161 res = todo_list_write_to_file(the_repository, &todo_list,
162 todo_file, NULL, NULL, -1, 0);
163 todo_list_release(&todo_list);
164 if (res)
166 return error_errno(_("could not write '%s'."), todo_file);
167 return 0;
168}
169static int rearrange_squash_in_todo_file(void)
171{
172 const char *todo_file = rebase_path_todo();
173 struct todo_list todo_list = TODO_LIST_INIT;
174 int res = 0;
175 if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
177 return error_errno(_("could not read '%s'."), todo_file);
178 if (todo_list_parse_insn_buffer(the_repository, todo_list.buf.buf,
179 &todo_list)) {
180 todo_list_release(&todo_list);
181 return error(_("unusable todo list: '%s'"), todo_file);
182 }
183 res = todo_list_rearrange_squash(&todo_list);
185 if (!res)
186 res = todo_list_write_to_file(the_repository, &todo_list,
187 todo_file, NULL, NULL, -1, 0);
188 todo_list_release(&todo_list);
190 if (res)
192 return error_errno(_("could not write '%s'."), todo_file);
193 return 0;
194}
195static int transform_todo_file(unsigned flags)
197{
198 const char *todo_file = rebase_path_todo();
199 struct todo_list todo_list = TODO_LIST_INIT;
200 int res;
201 if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
203 return error_errno(_("could not read '%s'."), todo_file);
204 if (todo_list_parse_insn_buffer(the_repository, todo_list.buf.buf,
206 &todo_list)) {
207 todo_list_release(&todo_list);
208 return error(_("unusable todo list: '%s'"), todo_file);
209 }
210 res = todo_list_write_to_file(the_repository, &todo_list, todo_file,
212 NULL, NULL, -1, flags);
213 todo_list_release(&todo_list);
214 if (res)
216 return error_errno(_("could not write '%s'."), todo_file);
217 return 0;
218}
219static int edit_todo_file(unsigned flags)
221{
222 const char *todo_file = rebase_path_todo();
223 struct todo_list todo_list = TODO_LIST_INIT,
224 new_todo = TODO_LIST_INIT;
225 int res = 0;
226 if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
228 return error_errno(_("could not read '%s'."), todo_file);
229 strbuf_stripspace(&todo_list.buf, 1);
231 res = edit_todo_list(the_repository, &todo_list, &new_todo, NULL, NULL, flags);
232 if (!res && todo_list_write_to_file(the_repository, &new_todo, todo_file,
233 NULL, NULL, -1, flags & ~(TODO_LIST_SHORTEN_IDS)))
234 res = error_errno(_("could not write '%s'"), todo_file);
235 todo_list_release(&todo_list);
237 todo_list_release(&new_todo);
238 return res;
240}
241static int get_revision_ranges(struct commit *upstream, struct commit *onto,
243 const char **head_hash,
244 char **revisions, char **shortrevisions)
245{
246 struct commit *base_rev = upstream ? upstream : onto;
247 const char *shorthead;
248 struct object_id orig_head;
249 if (get_oid("HEAD", &orig_head))
251 return error(_("no HEAD?"));
252 *head_hash = find_unique_abbrev(&orig_head, GIT_MAX_HEXSZ);
254 *revisions = xstrfmt("%s...%s", oid_to_hex(&base_rev->object.oid),
255 *head_hash);
256 shorthead = find_unique_abbrev(&orig_head, DEFAULT_ABBREV);
258 if (upstream) {
260 const char *shortrev;
261 shortrev = find_unique_abbrev(&base_rev->object.oid,
263 DEFAULT_ABBREV);
264 *shortrevisions = xstrfmt("%s..%s", shortrev, shorthead);
266 } else
267 *shortrevisions = xstrdup(shorthead);
268 return 0;
270}
271static int init_basic_state(struct replay_opts *opts, const char *head_name,
273 struct commit *onto, const char *orig_head)
274{
275 FILE *interactive;
276 if (!is_directory(merge_dir()) && mkdir_in_gitdir(merge_dir()))
278 return error_errno(_("could not create temporary %s"), merge_dir());
279 delete_reflog("REBASE_HEAD");
281 interactive = fopen(path_interactive(), "w");
283 if (!interactive)
284 return error_errno(_("could not mark as interactive"));
285 fclose(interactive);
286 return write_basic_state(opts, head_name, onto, orig_head);
288}
289static void split_exec_commands(const char *cmd, struct string_list *commands)
291{
292 if (cmd && *cmd) {
293 string_list_split(commands, cmd, '\n', -1);
294 /* rebase.c adds a new line to cmd after every command,
296 * so here the last command is always empty */
297 string_list_remove_empty_items(commands, 0);
298 }
299}
300static int do_interactive_rebase(struct rebase_options *opts, unsigned flags)
302{
303 int ret;
304 const char *head_hash = NULL;
305 char *revisions = NULL, *shortrevisions = NULL;
306 struct argv_array make_script_args = ARGV_ARRAY_INIT;
307 struct todo_list todo_list = TODO_LIST_INIT;
308 struct replay_opts replay = get_replay_opts(opts);
309 struct string_list commands = STRING_LIST_INIT_DUP;
310 if (prepare_branch_to_be_rebased(the_repository, &replay,
312 opts->switch_to))
313 return -1;
314 if (get_revision_ranges(opts->upstream, opts->onto, &head_hash,
316 &revisions, &shortrevisions))
317 return -1;
318 if (init_basic_state(&replay,
320 opts->head_name ? opts->head_name : "detached HEAD",
321 opts->onto, head_hash)) {
322 free(revisions);
323 free(shortrevisions);
324 return -1;
326 }
327 if (!opts->upstream && opts->squash_onto)
329 write_file(path_squash_onto(), "%s\n",
330 oid_to_hex(opts->squash_onto));
331 argv_array_pushl(&make_script_args, "", revisions, NULL);
333 if (opts->restrict_revision)
334 argv_array_push(&make_script_args,
335 oid_to_hex(&opts->restrict_revision->object.oid));
336 ret = sequencer_make_script(the_repository, &todo_list.buf,
338 make_script_args.argc, make_script_args.argv,
339 flags);
340 if (ret)
342 error(_("could not generate todo list"));
343 else {
344 discard_cache();
345 if (todo_list_parse_insn_buffer(the_repository, todo_list.buf.buf,
346 &todo_list))
347 BUG("unusable todo list");
348 split_exec_commands(opts->cmd, &commands);
350 ret = complete_action(the_repository, &replay, flags,
351 shortrevisions, opts->onto_name, opts->onto, head_hash,
352 &commands, opts->autosquash, &todo_list);
353 }
354 string_list_clear(&commands, 0);
356 free(revisions);
357 free(shortrevisions);
358 todo_list_release(&todo_list);
359 argv_array_clear(&make_script_args);
360 return ret;
362}
363static int run_rebase_interactive(struct rebase_options *opts,
365 enum action command)
366{
367 unsigned flags = 0;
368 int abbreviate_commands = 0, ret = 0;
369 git_config_get_bool("rebase.abbreviatecommands", &abbreviate_commands);
371 flags |= opts->keep_empty ? TODO_LIST_KEEP_EMPTY : 0;
373 flags |= abbreviate_commands ? TODO_LIST_ABBREVIATE_CMDS : 0;
374 flags |= opts->rebase_merges ? TODO_LIST_REBASE_MERGES : 0;
375 flags |= opts->rebase_cousins > 0 ? TODO_LIST_REBASE_COUSINS : 0;
376 flags |= command == ACTION_SHORTEN_OIDS ? TODO_LIST_SHORTEN_IDS : 0;
377 switch (command) {
379 case ACTION_NONE: {
380 if (!opts->onto && !opts->upstream)
381 die(_("a base commit must be provided with --upstream or --onto"));
382 ret = do_interactive_rebase(opts, flags);
384 break;
385 }
386 case ACTION_SKIP: {
387 struct string_list merge_rr = STRING_LIST_INIT_DUP;
388 rerere_clear(the_repository, &merge_rr);
390 }
391 /* fallthrough */
392 case ACTION_CONTINUE: {
393 struct replay_opts replay_opts = get_replay_opts(opts);
394 ret = sequencer_continue(the_repository, &replay_opts);
396 break;
397 }
398 case ACTION_EDIT_TODO:
399 ret = edit_todo_file(flags);
400 break;
401 case ACTION_SHOW_CURRENT_PATCH: {
402 struct child_process cmd = CHILD_PROCESS_INIT;
403 cmd.git_cmd = 1;
405 argv_array_pushl(&cmd.args, "show", "REBASE_HEAD", "--", NULL);
406 ret = run_command(&cmd);
407 break;
409 }
410 case ACTION_SHORTEN_OIDS:
411 case ACTION_EXPAND_OIDS:
412 ret = transform_todo_file(flags);
413 break;
414 case ACTION_CHECK_TODO_LIST:
415 ret = check_todo_list_from_file(the_repository);
416 break;
417 case ACTION_REARRANGE_SQUASH:
418 ret = rearrange_squash_in_todo_file();
419 break;
420 case ACTION_ADD_EXEC: {
421 struct string_list commands = STRING_LIST_INIT_DUP;
422 split_exec_commands(opts->cmd, &commands);
424 ret = add_exec_commands(&commands);
425 string_list_clear(&commands, 0);
426 break;
427 }
428 default:
429 BUG("invalid command '%d'", command);
430 }
431 return ret;
433}
434static const char * const builtin_rebase_interactive_usage[] = {
436 N_("git rebase--interactive [<options>]"),
437 NULL
438};
439int cmd_rebase__interactive(int argc, const char **argv, const char *prefix)
441{
442 struct rebase_options opts = REBASE_OPTIONS_INIT;
443 struct object_id squash_onto = null_oid;
444 enum action command = ACTION_NONE;
445 struct option options[] = {
446 OPT_NEGBIT(0, "ff", &opts.flags, N_("allow fast-forward"),
447 REBASE_FORCE),
448 OPT_BOOL(0, "keep-empty", &opts.keep_empty, N_("keep empty commits")),
449 OPT_BOOL(0, "allow-empty-message", &opts.allow_empty_message,
450 N_("allow commits with empty messages")),
451 OPT_BOOL(0, "rebase-merges", &opts.rebase_merges, N_("rebase merge commits")),
452 OPT_BOOL(0, "rebase-cousins", &opts.rebase_cousins,
453 N_("keep original branch points of cousins")),
454 OPT_BOOL(0, "autosquash", &opts.autosquash,
455 N_("move commits that begin with squash!/fixup!")),
456 OPT_BOOL(0, "signoff", &opts.signoff, N_("sign commits")),
457 OPT_BIT('v', "verbose", &opts.flags,
458 N_("display a diffstat of what changed upstream"),
459 REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT),
460 OPT_CMDMODE(0, "continue", &command, N_("continue rebase"),
461 ACTION_CONTINUE),
462 OPT_CMDMODE(0, "skip", &command, N_("skip commit"), ACTION_SKIP),
463 OPT_CMDMODE(0, "edit-todo", &command, N_("edit the todo list"),
464 ACTION_EDIT_TODO),
465 OPT_CMDMODE(0, "show-current-patch", &command, N_("show the current patch"),
466 ACTION_SHOW_CURRENT_PATCH),
467 OPT_CMDMODE(0, "shorten-ids", &command,
468 N_("shorten commit ids in the todo list"), ACTION_SHORTEN_OIDS),
469 OPT_CMDMODE(0, "expand-ids", &command,
470 N_("expand commit ids in the todo list"), ACTION_EXPAND_OIDS),
471 OPT_CMDMODE(0, "check-todo-list", &command,
472 N_("check the todo list"), ACTION_CHECK_TODO_LIST),
473 OPT_CMDMODE(0, "rearrange-squash", &command,
474 N_("rearrange fixup/squash lines"), ACTION_REARRANGE_SQUASH),
475 OPT_CMDMODE(0, "add-exec-commands", &command,
476 N_("insert exec commands in todo list"), ACTION_ADD_EXEC),
477 { OPTION_CALLBACK, 0, "onto", &opts.onto, N_("onto"), N_("onto"),
478 PARSE_OPT_NONEG, parse_opt_commit, 0 },
479 { OPTION_CALLBACK, 0, "restrict-revision", &opts.restrict_revision,
480 N_("restrict-revision"), N_("restrict revision"),
481 PARSE_OPT_NONEG, parse_opt_commit, 0 },
482 { OPTION_CALLBACK, 0, "squash-onto", &squash_onto, N_("squash-onto"),
483 N_("squash onto"), PARSE_OPT_NONEG, parse_opt_object_id, 0 },
484 { OPTION_CALLBACK, 0, "upstream", &opts.upstream, N_("upstream"),
485 N_("the upstream commit"), PARSE_OPT_NONEG, parse_opt_commit,
486 0 },
487 OPT_STRING(0, "head-name", &opts.head_name, N_("head-name"), N_("head name")),
488 { OPTION_STRING, 'S', "gpg-sign", &opts.gpg_sign_opt, N_("key-id"),
489 N_("GPG-sign commits"),
490 PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
491 OPT_STRING(0, "strategy", &opts.strategy, N_("strategy"),
492 N_("rebase strategy")),
493 OPT_STRING(0, "strategy-opts", &opts.strategy_opts, N_("strategy-opts"),
494 N_("strategy options")),
495 OPT_STRING(0, "switch-to", &opts.switch_to, N_("switch-to"),
496 N_("the branch or commit to checkout")),
497 OPT_STRING(0, "onto-name", &opts.onto_name, N_("onto-name"), N_("onto name")),
498 OPT_STRING(0, "cmd", &opts.cmd, N_("cmd"), N_("the command to run")),
499 OPT_RERERE_AUTOUPDATE(&opts.allow_rerere_autoupdate),
500 OPT_BOOL(0, "reschedule-failed-exec", &opts.reschedule_failed_exec,
501 N_("automatically re-schedule any `exec` that fails")),
502 OPT_END()
503 };
504 opts.rebase_cousins = -1;
506 if (argc == 1)
508 usage_with_options(builtin_rebase_interactive_usage, options);
509 argc = parse_options(argc, argv, NULL, options,
511 builtin_rebase_interactive_usage, PARSE_OPT_KEEP_ARGV0);
512 if (!is_null_oid(&squash_onto))
514 opts.squash_onto = &squash_onto;
515 if (opts.rebase_cousins >= 0 && !opts.rebase_merges)
517 warning(_("--[no-]rebase-cousins has no effect without "
518 "--rebase-merges"));
519 return !!run_rebase_interactive(&opts, command);
521}
522static int use_builtin_rebase(void)
524{
525 struct child_process cp = CHILD_PROCESS_INIT;
526 struct strbuf out = STRBUF_INIT;
527 int ret, env = git_env_bool("GIT_TEST_REBASE_USE_BUILTIN", -1);
528 if (env != -1)
530 return env;
531 argv_array_pushl(&cp.args,
533 "config", "--bool", "rebase.usebuiltin", NULL);
534 cp.git_cmd = 1;
535 if (capture_command(&cp, &out, 6)) {
536 strbuf_release(&out);
537 return 1;
538 }
539 strbuf_trim(&out);
541 ret = !strcmp("true", out.buf);
542 strbuf_release(&out);
543 return ret;
544}
545static int is_interactive(struct rebase_options *opts)
547{
548 return opts->type == REBASE_INTERACTIVE ||
549 opts->type == REBASE_PRESERVE_MERGES;
550}
551static void imply_interactive(struct rebase_options *opts, const char *option)
553{
554 switch (opts->type) {
555 case REBASE_AM:
556 die(_("%s requires an interactive rebase"), option);
557 break;
558 case REBASE_INTERACTIVE:
559 case REBASE_PRESERVE_MERGES:
560 break;
561 case REBASE_MERGE:
562 /* we now implement --merge via --interactive */
563 default:
564 opts->type = REBASE_INTERACTIVE; /* implied */
565 break;
566 }
567}
568/* Returns the filename prefixed by the state_dir */
570static const char *state_dir_path(const char *filename, struct rebase_options *opts)
571{
572 static struct strbuf path = STRBUF_INIT;
573 static size_t prefix_len;
574 if (!prefix_len) {
576 strbuf_addf(&path, "%s/", opts->state_dir);
577 prefix_len = path.len;
578 }
579 strbuf_setlen(&path, prefix_len);
581 strbuf_addstr(&path, filename);
582 return path.buf;
583}
584/* Read one file, then strip line endings */
586static int read_one(const char *path, struct strbuf *buf)
587{
588 if (strbuf_read_file(buf, path, 0) < 0)
589 return error_errno(_("could not read '%s'"), path);
590 strbuf_trim_trailing_newline(buf);
591 return 0;
592}
593/* Initialize the rebase options from the state directory. */
595static int read_basic_state(struct rebase_options *opts)
596{
597 struct strbuf head_name = STRBUF_INIT;
598 struct strbuf buf = STRBUF_INIT;
599 struct object_id oid;
600 if (read_one(state_dir_path("head-name", opts), &head_name) ||
602 read_one(state_dir_path("onto", opts), &buf))
603 return -1;
604 opts->head_name = starts_with(head_name.buf, "refs/") ?
605 xstrdup(head_name.buf) : NULL;
606 strbuf_release(&head_name);
607 if (get_oid(buf.buf, &oid))
608 return error(_("could not get 'onto': '%s'"), buf.buf);
609 opts->onto = lookup_commit_or_die(&oid, buf.buf);
610 /*
612 * We always write to orig-head, but interactive rebase used to write to
613 * head. Fall back to reading from head to cover for the case that the
614 * user upgraded git with an ongoing interactive rebase.
615 */
616 strbuf_reset(&buf);
617 if (file_exists(state_dir_path("orig-head", opts))) {
618 if (read_one(state_dir_path("orig-head", opts), &buf))
619 return -1;
620 } else if (read_one(state_dir_path("head", opts), &buf))
621 return -1;
622 if (get_oid(buf.buf, &opts->orig_head))
623 return error(_("invalid orig-head: '%s'"), buf.buf);
624 if (file_exists(state_dir_path("quiet", opts)))
626 opts->flags &= ~REBASE_NO_QUIET;
627 else
628 opts->flags |= REBASE_NO_QUIET;
629 if (file_exists(state_dir_path("verbose", opts)))
631 opts->flags |= REBASE_VERBOSE;
632 if (file_exists(state_dir_path("signoff", opts))) {
634 opts->signoff = 1;
635 opts->flags |= REBASE_FORCE;
636 }
637 if (file_exists(state_dir_path("allow_rerere_autoupdate", opts))) {
639 strbuf_reset(&buf);
640 if (read_one(state_dir_path("allow_rerere_autoupdate", opts),
641 &buf))
642 return -1;
643 if (!strcmp(buf.buf, "--rerere-autoupdate"))
644 opts->allow_rerere_autoupdate = RERERE_AUTOUPDATE;
645 else if (!strcmp(buf.buf, "--no-rerere-autoupdate"))
646 opts->allow_rerere_autoupdate = RERERE_NOAUTOUPDATE;
647 else
648 warning(_("ignoring invalid allow_rerere_autoupdate: "
649 "'%s'"), buf.buf);
650 }
651 if (file_exists(state_dir_path("gpg_sign_opt", opts))) {
653 strbuf_reset(&buf);
654 if (read_one(state_dir_path("gpg_sign_opt", opts),
655 &buf))
656 return -1;
657 free(opts->gpg_sign_opt);
658 opts->gpg_sign_opt = xstrdup(buf.buf);
659 }
660 if (file_exists(state_dir_path("strategy", opts))) {
662 strbuf_reset(&buf);
663 if (read_one(state_dir_path("strategy", opts), &buf))
664 return -1;
665 free(opts->strategy);
666 opts->strategy = xstrdup(buf.buf);
667 }
668 if (file_exists(state_dir_path("strategy_opts", opts))) {
670 strbuf_reset(&buf);
671 if (read_one(state_dir_path("strategy_opts", opts), &buf))
672 return -1;
673 free(opts->strategy_opts);
674 opts->strategy_opts = xstrdup(buf.buf);
675 }
676 strbuf_release(&buf);
678 return 0;
680}
681static int rebase_write_basic_state(struct rebase_options *opts)
683{
684 write_file(state_dir_path("head-name", opts), "%s",
685 opts->head_name ? opts->head_name : "detached HEAD");
686 write_file(state_dir_path("onto", opts), "%s",
687 opts->onto ? oid_to_hex(&opts->onto->object.oid) : "");
688 write_file(state_dir_path("orig-head", opts), "%s",
689 oid_to_hex(&opts->orig_head));
690 write_file(state_dir_path("quiet", opts), "%s",
691 opts->flags & REBASE_NO_QUIET ? "" : "t");
692 if (opts->flags & REBASE_VERBOSE)
693 write_file(state_dir_path("verbose", opts), "%s", "");
694 if (opts->strategy)
695 write_file(state_dir_path("strategy", opts), "%s",
696 opts->strategy);
697 if (opts->strategy_opts)
698 write_file(state_dir_path("strategy_opts", opts), "%s",
699 opts->strategy_opts);
700 if (opts->allow_rerere_autoupdate > 0)
701 write_file(state_dir_path("allow_rerere_autoupdate", opts),
702 "-%s-rerere-autoupdate",
703 opts->allow_rerere_autoupdate == RERERE_AUTOUPDATE ?
704 "" : "-no");
705 if (opts->gpg_sign_opt)
706 write_file(state_dir_path("gpg_sign_opt", opts), "%s",
707 opts->gpg_sign_opt);
708 if (opts->signoff)
709 write_file(state_dir_path("strategy", opts), "--signoff");
710 return 0;
712}
713static int apply_autostash(struct rebase_options *opts)
715{
716 const char *path = state_dir_path("autostash", opts);
717 struct strbuf autostash = STRBUF_INIT;
718 struct child_process stash_apply = CHILD_PROCESS_INIT;
719 if (!file_exists(path))
721 return 0;
722 if (read_one(path, &autostash))
724 return error(_("Could not read '%s'"), path);
725 /* Ensure that the hash is not mistaken for a number */
726 strbuf_addstr(&autostash, "^0");
727 argv_array_pushl(&stash_apply.args,
728 "stash", "apply", autostash.buf, NULL);
729 stash_apply.git_cmd = 1;
730 stash_apply.no_stderr = stash_apply.no_stdout =
731 stash_apply.no_stdin = 1;
732 if (!run_command(&stash_apply))
733 printf(_("Applied autostash.\n"));
734 else {
735 struct argv_array args = ARGV_ARRAY_INIT;
736 int res = 0;
737 argv_array_pushl(&args,
739 "stash", "store", "-m", "autostash", "-q",
740 autostash.buf, NULL);
741 if (run_command_v_opt(args.argv, RUN_GIT_CMD))
742 res = error(_("Cannot store %s"), autostash.buf);
743 argv_array_clear(&args);
744 strbuf_release(&autostash);
745 if (res)
746 return res;
747 fprintf(stderr,
749 _("Applying autostash resulted in conflicts.\n"
750 "Your changes are safe in the stash.\n"
751 "You can run \"git stash pop\" or \"git stash drop\" "
752 "at any time.\n"));
753 }
754 strbuf_release(&autostash);
756 return 0;
757}
758static int finish_rebase(struct rebase_options *opts)
760{
761 struct strbuf dir = STRBUF_INIT;
762 const char *argv_gc_auto[] = { "gc", "--auto", NULL };
763 delete_ref(NULL, "REBASE_HEAD", NULL, REF_NO_DEREF);
765 apply_autostash(opts);
766 close_all_packs(the_repository->objects);
767 /*
768 * We ignore errors in 'gc --auto', since the
769 * user should see them.
770 */
771 run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
772 strbuf_addstr(&dir, opts->state_dir);
773 remove_dir_recursively(&dir, 0);
774 strbuf_release(&dir);
775 return 0;
777}
778static struct commit *peel_committish(const char *name)
780{
781 struct object *obj;
782 struct object_id oid;
783 if (get_oid(name, &oid))
785 return NULL;
786 obj = parse_object(the_repository, &oid);
787 return (struct commit *)peel_to_type(name, 0, obj, OBJ_COMMIT);
788}
789static void add_var(struct strbuf *buf, const char *name, const char *value)
791{
792 if (!value)
793 strbuf_addf(buf, "unset %s; ", name);
794 else {
795 strbuf_addf(buf, "%s=", name);
796 sq_quote_buf(buf, value);
797 strbuf_addstr(buf, "; ");
798 }
799}
800#define GIT_REFLOG_ACTION_ENVIRONMENT "GIT_REFLOG_ACTION"
802#define RESET_HEAD_DETACH (1<<0)
804#define RESET_HEAD_HARD (1<<1)
805#define RESET_HEAD_RUN_POST_CHECKOUT_HOOK (1<<2)
806#define RESET_HEAD_REFS_ONLY (1<<3)
807static int reset_head(struct object_id *oid, const char *action,
809 const char *switch_to_branch, unsigned flags,
810 const char *reflog_orig_head, const char *reflog_head)
811{
812 unsigned detach_head = flags & RESET_HEAD_DETACH;
813 unsigned reset_hard = flags & RESET_HEAD_HARD;
814 unsigned run_hook = flags & RESET_HEAD_RUN_POST_CHECKOUT_HOOK;
815 unsigned refs_only = flags & RESET_HEAD_REFS_ONLY;
816 struct object_id head_oid;
817 struct tree_desc desc[2] = { { NULL }, { NULL } };
818 struct lock_file lock = LOCK_INIT;
819 struct unpack_trees_options unpack_tree_opts;
820 struct tree *tree;
821 const char *reflog_action;
822 struct strbuf msg = STRBUF_INIT;
823 size_t prefix_len;
824 struct object_id *orig = NULL, oid_orig,
825 *old_orig = NULL, oid_old_orig;
826 int ret = 0, nr = 0;
827 if (switch_to_branch && !starts_with(switch_to_branch, "refs/"))
829 BUG("Not a fully qualified branch: '%s'", switch_to_branch);
830 if (!refs_only && hold_locked_index(&lock, LOCK_REPORT_ON_ERROR) < 0) {
832 ret = -1;
833 goto leave_reset_head;
834 }
835 if ((!oid || !reset_hard) && get_oid("HEAD", &head_oid)) {
837 ret = error(_("could not determine HEAD revision"));
838 goto leave_reset_head;
839 }
840 if (!oid)
842 oid = &head_oid;
843 if (refs_only)
845 goto reset_head_refs;
846 memset(&unpack_tree_opts, 0, sizeof(unpack_tree_opts));
848 setup_unpack_trees_porcelain(&unpack_tree_opts, action);
849 unpack_tree_opts.head_idx = 1;
850 unpack_tree_opts.src_index = the_repository->index;
851 unpack_tree_opts.dst_index = the_repository->index;
852 unpack_tree_opts.fn = reset_hard ? oneway_merge : twoway_merge;
853 unpack_tree_opts.update = 1;
854 unpack_tree_opts.merge = 1;
855 if (!detach_head)
856 unpack_tree_opts.reset = 1;
857 if (repo_read_index_unmerged(the_repository) < 0) {
859 ret = error(_("could not read index"));
860 goto leave_reset_head;
861 }
862 if (!reset_hard && !fill_tree_descriptor(&desc[nr++], &head_oid)) {
864 ret = error(_("failed to find tree of %s"),
865 oid_to_hex(&head_oid));
866 goto leave_reset_head;
867 }
868 if (!fill_tree_descriptor(&desc[nr++], oid)) {
870 ret = error(_("failed to find tree of %s"), oid_to_hex(oid));
871 goto leave_reset_head;
872 }
873 if (unpack_trees(nr, desc, &unpack_tree_opts)) {
875 ret = -1;
876 goto leave_reset_head;
877 }
878 tree = parse_tree_indirect(oid);
880 prime_cache_tree(the_repository, the_repository->index, tree);
881 if (write_locked_index(the_repository->index, &lock, COMMIT_LOCK) < 0) {
883 ret = error(_("could not write index"));
884 goto leave_reset_head;
885 }
886reset_head_refs:
888 reflog_action = getenv(GIT_REFLOG_ACTION_ENVIRONMENT);
889 strbuf_addf(&msg, "%s: ", reflog_action ? reflog_action : "rebase");
890 prefix_len = msg.len;
891 if (!get_oid("ORIG_HEAD", &oid_old_orig))
893 old_orig = &oid_old_orig;
894 if (!get_oid("HEAD", &oid_orig)) {
895 orig = &oid_orig;
896 if (!reflog_orig_head) {
897 strbuf_addstr(&msg, "updating ORIG_HEAD");
898 reflog_orig_head = msg.buf;
899 }
900 update_ref(reflog_orig_head, "ORIG_HEAD", orig, old_orig, 0,
901 UPDATE_REFS_MSG_ON_ERR);
902 } else if (old_orig)
903 delete_ref(NULL, "ORIG_HEAD", old_orig, 0);
904 if (!reflog_head) {
905 strbuf_setlen(&msg, prefix_len);
906 strbuf_addstr(&msg, "updating HEAD");
907 reflog_head = msg.buf;
908 }
909 if (!switch_to_branch)
910 ret = update_ref(reflog_head, "HEAD", oid, orig,
911 detach_head ? REF_NO_DEREF : 0,
912 UPDATE_REFS_MSG_ON_ERR);
913 else {
914 ret = update_ref(reflog_orig_head, switch_to_branch, oid,
915 NULL, 0, UPDATE_REFS_MSG_ON_ERR);
916 if (!ret)
917 ret = create_symref("HEAD", switch_to_branch,
918 reflog_head);
919 }
920 if (run_hook)
921 run_hook_le(NULL, "post-checkout",
922 oid_to_hex(orig ? orig : &null_oid),
923 oid_to_hex(oid), "1", NULL);
924leave_reset_head:
926 strbuf_release(&msg);
927 rollback_lock_file(&lock);
928 while (nr)
929 free((void *)desc[--nr].buffer);
930 return ret;
931}
932static int move_to_original_branch(struct rebase_options *opts)
934{
935 struct strbuf orig_head_reflog = STRBUF_INIT, head_reflog = STRBUF_INIT;
936 int ret;
937 if (!opts->head_name)
939 return 0; /* nothing to move back to */
940 if (!opts->onto)
942 BUG("move_to_original_branch without onto");
943 strbuf_addf(&orig_head_reflog, "rebase finished: %s onto %s",
945 opts->head_name, oid_to_hex(&opts->onto->object.oid));
946 strbuf_addf(&head_reflog, "rebase finished: returning to %s",
947 opts->head_name);
948 ret = reset_head(NULL, "", opts->head_name, RESET_HEAD_REFS_ONLY,
949 orig_head_reflog.buf, head_reflog.buf);
950 strbuf_release(&orig_head_reflog);
952 strbuf_release(&head_reflog);
953 return ret;
954}
955static const char *resolvemsg =
957N_("Resolve all conflicts manually, mark them as resolved with\n"
958"\"git add/rm <conflicted_files>\", then run \"git rebase --continue\".\n"
959"You can instead skip this commit: run \"git rebase --skip\".\n"
960"To abort and get back to the state before \"git rebase\", run "
961"\"git rebase --abort\".");
962static int run_am(struct rebase_options *opts)
964{
965 struct child_process am = CHILD_PROCESS_INIT;
966 struct child_process format_patch = CHILD_PROCESS_INIT;
967 struct strbuf revisions = STRBUF_INIT;
968 int status;
969 char *rebased_patches;
970 am.git_cmd = 1;
972 argv_array_push(&am.args, "am");
973 if (opts->action && !strcmp("continue", opts->action)) {
975 argv_array_push(&am.args, "--resolved");
976 argv_array_pushf(&am.args, "--resolvemsg=%s", resolvemsg);
977 if (opts->gpg_sign_opt)
978 argv_array_push(&am.args, opts->gpg_sign_opt);
979 status = run_command(&am);
980 if (status)
981 return status;
982 return move_to_original_branch(opts);
984 }
985 if (opts->action && !strcmp("skip", opts->action)) {
986 argv_array_push(&am.args, "--skip");
987 argv_array_pushf(&am.args, "--resolvemsg=%s", resolvemsg);
988 status = run_command(&am);
989 if (status)
990 return status;
991 return move_to_original_branch(opts);
993 }
994 if (opts->action && !strcmp("show-current-patch", opts->action)) {
995 argv_array_push(&am.args, "--show-current-patch");
996 return run_command(&am);
997 }
998 strbuf_addf(&revisions, "%s...%s",
1000 oid_to_hex(opts->root ?
1001 /* this is now equivalent to !opts->upstream */
1002 &opts->onto->object.oid :
1003 &opts->upstream->object.oid),
1004 oid_to_hex(&opts->orig_head));
1005 rebased_patches = xstrdup(git_path("rebased-patches"));
1007 format_patch.out = open(rebased_patches,
1008 O_WRONLY | O_CREAT | O_TRUNC, 0666);
1009 if (format_patch.out < 0) {
1010 status = error_errno(_("could not open '%s' for writing"),
1011 rebased_patches);
1012 free(rebased_patches);
1013 argv_array_clear(&am.args);
1014 return status;
1015 }
1016 format_patch.git_cmd = 1;
1018 argv_array_pushl(&format_patch.args, "format-patch", "-k", "--stdout",
1019 "--full-index", "--cherry-pick", "--right-only",
1020 "--src-prefix=a/", "--dst-prefix=b/", "--no-renames",
1021 "--no-cover-letter", "--pretty=mboxrd", "--topo-order", NULL);
1022 if (opts->git_format_patch_opt.len)
1023 argv_array_split(&format_patch.args,
1024 opts->git_format_patch_opt.buf);
1025 argv_array_push(&format_patch.args, revisions.buf);
1026 if (opts->restrict_revision)
1027 argv_array_pushf(&format_patch.args, "^%s",
1028 oid_to_hex(&opts->restrict_revision->object.oid));
1029 status = run_command(&format_patch);
1031 if (status) {
1032 unlink(rebased_patches);
1033 free(rebased_patches);
1034 argv_array_clear(&am.args);
1035 reset_head(&opts->orig_head, "checkout", opts->head_name, 0,
1037 "HEAD", NULL);
1038 error(_("\ngit encountered an error while preparing the "
1039 "patches to replay\n"
1040 "these revisions:\n"
1041 "\n %s\n\n"
1042 "As a result, git cannot rebase them."),
1043 opts->revisions);
1044 strbuf_release(&revisions);
1046 return status;
1047 }
1048 strbuf_release(&revisions);
1049 am.in = open(rebased_patches, O_RDONLY);
1051 if (am.in < 0) {
1052 status = error_errno(_("could not open '%s' for reading"),
1053 rebased_patches);
1054 free(rebased_patches);
1055 argv_array_clear(&am.args);
1056 return status;
1057 }
1058 argv_array_pushv(&am.args, opts->git_am_opts.argv);
1060 argv_array_push(&am.args, "--rebasing");
1061 argv_array_pushf(&am.args, "--resolvemsg=%s", resolvemsg);
1062 argv_array_push(&am.args, "--patch-format=mboxrd");
1063 if (opts->allow_rerere_autoupdate == RERERE_AUTOUPDATE)
1064 argv_array_push(&am.args, "--rerere-autoupdate");
1065 else if (opts->allow_rerere_autoupdate == RERERE_NOAUTOUPDATE)
1066 argv_array_push(&am.args, "--no-rerere-autoupdate");
1067 if (opts->gpg_sign_opt)
1068 argv_array_push(&am.args, opts->gpg_sign_opt);
1069 status = run_command(&am);
1070 unlink(rebased_patches);
1071 free(rebased_patches);
1072 if (!status) {
1074 return move_to_original_branch(opts);
1075 }
1076 if (is_directory(opts->state_dir))
1078 rebase_write_basic_state(opts);
1079 return status;
1081}
1082static int run_specific_rebase(struct rebase_options *opts, enum action action)
1084{
1085 const char *argv[] = { NULL, NULL };
1086 struct strbuf script_snippet = STRBUF_INIT, buf = STRBUF_INIT;
1087 int status;
1088 const char *backend, *backend_func;
1089 if (opts->type == REBASE_INTERACTIVE) {
1091 /* Run builtin interactive rebase */
1092 setenv("GIT_CHERRY_PICK_HELP", resolvemsg, 1);
1093 if (!(opts->flags & REBASE_INTERACTIVE_EXPLICIT)) {
1094 setenv("GIT_SEQUENCE_EDITOR", ":", 1);
1095 opts->autosquash = 0;
1096 }
1097 if (opts->gpg_sign_opt) {
1098 /* remove the leading "-S" */
1099 char *tmp = xstrdup(opts->gpg_sign_opt + 2);
1100 free(opts->gpg_sign_opt);
1101 opts->gpg_sign_opt = tmp;
1102 }
1103 status = run_rebase_interactive(opts, action);
1105 goto finished_rebase;
1106 }
1107 if (opts->type == REBASE_AM) {
1109 status = run_am(opts);
1110 goto finished_rebase;
1111 }
1112 add_var(&script_snippet, "GIT_DIR", absolute_path(get_git_dir()));
1114 add_var(&script_snippet, "state_dir", opts->state_dir);
1115 add_var(&script_snippet, "upstream_name", opts->upstream_name);
1117 add_var(&script_snippet, "upstream", opts->upstream ?
1118 oid_to_hex(&opts->upstream->object.oid) : NULL);
1119 add_var(&script_snippet, "head_name",
1120 opts->head_name ? opts->head_name : "detached HEAD");
1121 add_var(&script_snippet, "orig_head", oid_to_hex(&opts->orig_head));
1122 add_var(&script_snippet, "onto", opts->onto ?
1123 oid_to_hex(&opts->onto->object.oid) : NULL);
1124 add_var(&script_snippet, "onto_name", opts->onto_name);
1125 add_var(&script_snippet, "revisions", opts->revisions);
1126 add_var(&script_snippet, "restrict_revision", opts->restrict_revision ?
1127 oid_to_hex(&opts->restrict_revision->object.oid) : NULL);
1128 add_var(&script_snippet, "GIT_QUIET",
1129 opts->flags & REBASE_NO_QUIET ? "" : "t");
1130 sq_quote_argv_pretty(&buf, opts->git_am_opts.argv);
1131 add_var(&script_snippet, "git_am_opt", buf.buf);
1132 strbuf_release(&buf);
1133 add_var(&script_snippet, "verbose",
1134 opts->flags & REBASE_VERBOSE ? "t" : "");
1135 add_var(&script_snippet, "diffstat",
1136 opts->flags & REBASE_DIFFSTAT ? "t" : "");
1137 add_var(&script_snippet, "force_rebase",
1138 opts->flags & REBASE_FORCE ? "t" : "");
1139 if (opts->switch_to)
1140 add_var(&script_snippet, "switch_to", opts->switch_to);
1141 add_var(&script_snippet, "action", opts->action ? opts->action : "");
1142 add_var(&script_snippet, "signoff", opts->signoff ? "--signoff" : "");
1143 add_var(&script_snippet, "allow_rerere_autoupdate",
1144 opts->allow_rerere_autoupdate ?
1145 opts->allow_rerere_autoupdate == RERERE_AUTOUPDATE ?
1146 "--rerere-autoupdate" : "--no-rerere-autoupdate" : "");
1147 add_var(&script_snippet, "keep_empty", opts->keep_empty ? "yes" : "");
1148 add_var(&script_snippet, "autosquash", opts->autosquash ? "t" : "");
1149 add_var(&script_snippet, "gpg_sign_opt", opts->gpg_sign_opt);
1150 add_var(&script_snippet, "cmd", opts->cmd);
1151 add_var(&script_snippet, "allow_empty_message",
1152 opts->allow_empty_message ? "--allow-empty-message" : "");
1153 add_var(&script_snippet, "rebase_merges",
1154 opts->rebase_merges ? "t" : "");
1155 add_var(&script_snippet, "rebase_cousins",
1156 opts->rebase_cousins ? "t" : "");
1157 add_var(&script_snippet, "strategy", opts->strategy);
1158 add_var(&script_snippet, "strategy_opts", opts->strategy_opts);
1159 add_var(&script_snippet, "rebase_root", opts->root ? "t" : "");
1160 add_var(&script_snippet, "squash_onto",
1161 opts->squash_onto ? oid_to_hex(opts->squash_onto) : "");
1162 add_var(&script_snippet, "git_format_patch_opt",
1163 opts->git_format_patch_opt.buf);
1164 if (is_interactive(opts) &&
1166 !(opts->flags & REBASE_INTERACTIVE_EXPLICIT)) {
1167 strbuf_addstr(&script_snippet,
1168 "GIT_SEQUENCE_EDITOR=:; export GIT_SEQUENCE_EDITOR; ");
1169 opts->autosquash = 0;
1170 }
1171 switch (opts->type) {
1173 case REBASE_AM:
1174 backend = "git-rebase--am";
1175 backend_func = "git_rebase__am";
1176 break;
1177 case REBASE_PRESERVE_MERGES:
1178 backend = "git-rebase--preserve-merges";
1179 backend_func = "git_rebase__preserve_merges";
1180 break;
1181 default:
1182 BUG("Unhandled rebase type %d", opts->type);
1183 break;
1184 }
1185 strbuf_addf(&script_snippet,
1187 ". git-sh-setup && . git-rebase--common &&"
1188 " . %s && %s", backend, backend_func);
1189 argv[0] = script_snippet.buf;
1190 status = run_command_v_opt(argv, RUN_USING_SHELL);
1192finished_rebase:
1193 if (opts->dont_finish_rebase)
1194 ; /* do nothing */
1195 else if (opts->type == REBASE_INTERACTIVE)
1196 ; /* interactive rebase cleans up after itself */
1197 else if (status == 0) {
1198 if (!file_exists(state_dir_path("stopped-sha", opts)))
1199 finish_rebase(opts);
1200 } else if (status == 2) {
1201 struct strbuf dir = STRBUF_INIT;
1202 apply_autostash(opts);
1204 strbuf_addstr(&dir, opts->state_dir);
1205 remove_dir_recursively(&dir, 0);
1206 strbuf_release(&dir);
1207 die("Nothing to do");
1208 }
1209 strbuf_release(&script_snippet);
1211 return status ? -1 : 0;
1213}
1214static int rebase_config(const char *var, const char *value, void *data)
1216{
1217 struct rebase_options *opts = data;
1218 if (!strcmp(var, "rebase.stat")) {
1220 if (git_config_bool(var, value))
1221 opts->flags |= REBASE_DIFFSTAT;
1222 else
1223 opts->flags &= !REBASE_DIFFSTAT;
1224 return 0;
1225 }
1226 if (!strcmp(var, "rebase.autosquash")) {
1228 opts->autosquash = git_config_bool(var, value);
1229 return 0;
1230 }
1231 if (!strcmp(var, "commit.gpgsign")) {
1233 free(opts->gpg_sign_opt);
1234 opts->gpg_sign_opt = git_config_bool(var, value) ?
1235 xstrdup("-S") : NULL;
1236 return 0;
1237 }
1238 if (!strcmp(var, "rebase.autostash")) {
1240 opts->autostash = git_config_bool(var, value);
1241 return 0;
1242 }
1243 if (!strcmp(var, "rebase.reschedulefailedexec")) {
1245 opts->reschedule_failed_exec = git_config_bool(var, value);
1246 return 0;
1247 }
1248 return git_default_config(var, value, data);
1250}
1251/*
1253 * Determines whether the commits in from..to are linear, i.e. contain
1254 * no merge commits. This function *expects* `from` to be an ancestor of
1255 * `to`.
1256 */
1257static int is_linear_history(struct commit *from, struct commit *to)
1258{
1259 while (to && to != from) {
1260 parse_commit(to);
1261 if (!to->parents)
1262 return 1;
1263 if (to->parents->next)
1264 return 0;
1265 to = to->parents->item;
1266 }
1267 return 1;
1268}
1269static int can_fast_forward(struct commit *onto, struct object_id *head_oid,
1271 struct object_id *merge_base)
1272{
1273 struct commit *head = lookup_commit(the_repository, head_oid);
1274 struct commit_list *merge_bases;
1275 int res;
1276 if (!head)
1278 return 0;
1279 merge_bases = get_merge_bases(onto, head);
1281 if (merge_bases && !merge_bases->next) {
1282 oidcpy(merge_base, &merge_bases->item->object.oid);
1283 res = oideq(merge_base, &onto->object.oid);
1284 } else {
1285 oidcpy(merge_base, &null_oid);
1286 res = 0;
1287 }
1288 free_commit_list(merge_bases);
1289 return res && is_linear_history(onto, head);
1290}
1291/* -i followed by -m is still -i */
1293static int parse_opt_merge(const struct option *opt, const char *arg, int unset)
1294{
1295 struct rebase_options *opts = opt->value;
1296 BUG_ON_OPT_NEG(unset);
1298 BUG_ON_OPT_ARG(arg);
1299 if (!is_interactive(opts))
1301 opts->type = REBASE_MERGE;
1302 return 0;
1304}
1305/* -i followed by -p is still explicitly interactive, but -p alone is not */
1307static int parse_opt_interactive(const struct option *opt, const char *arg,
1308 int unset)
1309{
1310 struct rebase_options *opts = opt->value;
1311 BUG_ON_OPT_NEG(unset);
1313 BUG_ON_OPT_ARG(arg);
1314 opts->type = REBASE_INTERACTIVE;
1316 opts->flags |= REBASE_INTERACTIVE_EXPLICIT;
1317 return 0;
1319}
1320static void NORETURN error_on_missing_default_upstream(void)
1322{
1323 struct branch *current_branch = branch_get(NULL);
1324 printf(_("%s\n"
1326 "Please specify which branch you want to rebase against.\n"
1327 "See git-rebase(1) for details.\n"
1328 "\n"
1329 " git rebase '<branch>'\n"
1330 "\n"),
1331 current_branch ? _("There is no tracking information for "
1332 "the current branch.") :
1333 _("You are not currently on a branch."));
1334 if (current_branch) {
1336 const char *remote = current_branch->remote_name;
1337 if (!remote)
1339 remote = _("<remote>");
1340 printf(_("If you wish to set tracking information for this "
1342 "branch you can do so with:\n"
1343 "\n"
1344 " git branch --set-upstream-to=%s/<branch> %s\n"
1345 "\n"),
1346 remote, current_branch->name);
1347 }
1348 exit(1);
1349}
1350static void set_reflog_action(struct rebase_options *options)
1352{
1353 const char *env;
1354 struct strbuf buf = STRBUF_INIT;
1355 if (!is_interactive(options))
1357 return;
1358 env = getenv(GIT_REFLOG_ACTION_ENVIRONMENT);
1360 if (env && strcmp("rebase", env))
1361 return; /* only override it if it is "rebase" */
1362 strbuf_addf(&buf, "rebase -i (%s)", options->action);
1364 setenv(GIT_REFLOG_ACTION_ENVIRONMENT, buf.buf, 1);
1365 strbuf_release(&buf);
1366}
1367static int check_exec_cmd(const char *cmd)
1369{
1370 if (strchr(cmd, '\n'))
1371 return error(_("exec commands cannot contain newlines"));
1372 /* Does the command consist purely of whitespace? */
1374 if (!cmd[strspn(cmd, " \t\r\f\v")])
1375 return error(_("empty exec command"));
1376 return 0;
1378}
1379int cmd_rebase(int argc, const char **argv, const char *prefix)
1382{
1383 struct rebase_options options = REBASE_OPTIONS_INIT;
1384 const char *branch_name;
1385 int ret, flags, total_argc, in_progress = 0;
1386 int ok_to_skip_pre_rebase = 0;
1387 struct strbuf msg = STRBUF_INIT;
1388 struct strbuf revisions = STRBUF_INIT;
1389 struct strbuf buf = STRBUF_INIT;
1390 struct object_id merge_base;
1391 enum action action = ACTION_NONE;
1392 const char *gpg_sign = NULL;
1393 struct string_list exec = STRING_LIST_INIT_NODUP;
1394 const char *rebase_merges = NULL;
1395 int fork_point = -1;
1396 struct string_list strategy_options = STRING_LIST_INIT_NODUP;
1397 struct object_id squash_onto;
1398 char *squash_onto_name = NULL;
1399 struct option builtin_rebase_options[] = {
1400 OPT_STRING(0, "onto", &options.onto_name,
1401 N_("revision"),
1402 N_("rebase onto given branch instead of upstream")),
1403 OPT_BOOL(0, "no-verify", &ok_to_skip_pre_rebase,
1404 N_("allow pre-rebase hook to run")),
1405 OPT_NEGBIT('q', "quiet", &options.flags,
1406 N_("be quiet. implies --no-stat"),
1407 REBASE_NO_QUIET| REBASE_VERBOSE | REBASE_DIFFSTAT),
1408 OPT_BIT('v', "verbose", &options.flags,
1409 N_("display a diffstat of what changed upstream"),
1410 REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT),
1411 {OPTION_NEGBIT, 'n', "no-stat", &options.flags, NULL,
1412 N_("do not show diffstat of what changed upstream"),
1413 PARSE_OPT_NOARG, NULL, REBASE_DIFFSTAT },
1414 OPT_BOOL(0, "signoff", &options.signoff,
1415 N_("add a Signed-off-by: line to each commit")),
1416 OPT_PASSTHRU_ARGV(0, "ignore-whitespace", &options.git_am_opts,
1417 NULL, N_("passed to 'git am'"),
1418 PARSE_OPT_NOARG),
1419 OPT_PASSTHRU_ARGV(0, "committer-date-is-author-date",
1420 &options.git_am_opts, NULL,
1421 N_("passed to 'git am'"), PARSE_OPT_NOARG),
1422 OPT_PASSTHRU_ARGV(0, "ignore-date", &options.git_am_opts, NULL,
1423 N_("passed to 'git am'"), PARSE_OPT_NOARG),
1424 OPT_PASSTHRU_ARGV('C', NULL, &options.git_am_opts, N_("n"),
1425 N_("passed to 'git apply'"), 0),
1426 OPT_PASSTHRU_ARGV(0, "whitespace", &options.git_am_opts,
1427 N_("action"), N_("passed to 'git apply'"), 0),
1428 OPT_BIT('f', "force-rebase", &options.flags,
1429 N_("cherry-pick all commits, even if unchanged"),
1430 REBASE_FORCE),
1431 OPT_BIT(0, "no-ff", &options.flags,
1432 N_("cherry-pick all commits, even if unchanged"),
1433 REBASE_FORCE),
1434 OPT_CMDMODE(0, "continue", &action, N_("continue"),
1435 ACTION_CONTINUE),
1436 OPT_CMDMODE(0, "skip", &action,
1437 N_("skip current patch and continue"), ACTION_SKIP),
1438 OPT_CMDMODE(0, "abort", &action,
1439 N_("abort and check out the original branch"),
1440 ACTION_ABORT),
1441 OPT_CMDMODE(0, "quit", &action,
1442 N_("abort but keep HEAD where it is"), ACTION_QUIT),
1443 OPT_CMDMODE(0, "edit-todo", &action, N_("edit the todo list "
1444 "during an interactive rebase"), ACTION_EDIT_TODO),
1445 OPT_CMDMODE(0, "show-current-patch", &action,
1446 N_("show the patch file being applied or merged"),
1447 ACTION_SHOW_CURRENT_PATCH),
1448 { OPTION_CALLBACK, 'm', "merge", &options, NULL,
1449 N_("use merging strategies to rebase"),
1450 PARSE_OPT_NOARG | PARSE_OPT_NONEG,
1451 parse_opt_merge },
1452 { OPTION_CALLBACK, 'i', "interactive", &options, NULL,
1453 N_("let the user edit the list of commits to rebase"),
1454 PARSE_OPT_NOARG | PARSE_OPT_NONEG,
1455 parse_opt_interactive },
1456 OPT_SET_INT('p', "preserve-merges", &options.type,
1457 N_("try to recreate merges instead of ignoring "
1458 "them"), REBASE_PRESERVE_MERGES),
1459 OPT_RERERE_AUTOUPDATE(&options.allow_rerere_autoupdate),
1460 OPT_BOOL('k', "keep-empty", &options.keep_empty,
1461 N_("preserve empty commits during rebase")),
1462 OPT_BOOL(0, "autosquash", &options.autosquash,
1463 N_("move commits that begin with "
1464 "squash!/fixup! under -i")),
1465 { OPTION_STRING, 'S', "gpg-sign", &gpg_sign, N_("key-id"),
1466 N_("GPG-sign commits"),
1467 PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
1468 OPT_BOOL(0, "autostash", &options.autostash,
1469 N_("automatically stash/stash pop before and after")),
1470 OPT_STRING_LIST('x', "exec", &exec, N_("exec"),
1471 N_("add exec lines after each commit of the "
1472 "editable list")),
1473 OPT_BOOL(0, "allow-empty-message",
1474 &options.allow_empty_message,
1475 N_("allow rebasing commits with empty messages")),
1476 {OPTION_STRING, 'r', "rebase-merges", &rebase_merges,
1477 N_("mode"),
1478 N_("try to rebase merges instead of skipping them"),
1479 PARSE_OPT_OPTARG, NULL, (intptr_t)""},
1480 OPT_BOOL(0, "fork-point", &fork_point,
1481 N_("use 'merge-base --fork-point' to refine upstream")),
1482 OPT_STRING('s', "strategy", &options.strategy,
1483 N_("strategy"), N_("use the given merge strategy")),
1484 OPT_STRING_LIST('X', "strategy-option", &strategy_options,
1485 N_("option"),
1486 N_("pass the argument through to the merge "
1487 "strategy")),
1488 OPT_BOOL(0, "root", &options.root,
1489 N_("rebase all reachable commits up to the root(s)")),
1490 OPT_BOOL(0, "reschedule-failed-exec",
1491 &options.reschedule_failed_exec,
1492 N_("automatically re-schedule any `exec` that fails")),
1493 OPT_END(),
1494 };
1495 int i;
1496 /*
1498 * NEEDSWORK: Once the builtin rebase has been tested enough
1499 * and git-legacy-rebase.sh is retired to contrib/, this preamble
1500 * can be removed.
1501 */
1502 if (!use_builtin_rebase()) {
1504 const char *path = mkpath("%s/git-legacy-rebase",
1505 git_exec_path());
1506 if (sane_execvp(path, (char **)argv) < 0)
1508 die_errno(_("could not exec %s"), path);
1509 else
1510 BUG("sane_execvp() returned???");
1511 }
1512 if (argc == 2 && !strcmp(argv[1], "-h"))
1514 usage_with_options(builtin_rebase_usage,
1515 builtin_rebase_options);
1516 prefix = setup_git_directory();
1518 trace_repo_setup(prefix);
1519 setup_work_tree();
1520 options.allow_empty_message = 1;
1522 git_config(rebase_config, &options);
1523 strbuf_reset(&buf);
1525 strbuf_addf(&buf, "%s/applying", apply_dir());
1526 if(file_exists(buf.buf))
1527 die(_("It looks like 'git am' is in progress. Cannot rebase."));
1528 if (is_directory(apply_dir())) {
1530 options.type = REBASE_AM;
1531 options.state_dir = apply_dir();
1532 } else if (is_directory(merge_dir())) {
1533 strbuf_reset(&buf);
1534 strbuf_addf(&buf, "%s/rewritten", merge_dir());
1535 if (is_directory(buf.buf)) {
1536 options.type = REBASE_PRESERVE_MERGES;
1537 options.flags |= REBASE_INTERACTIVE_EXPLICIT;
1538 } else {
1539 strbuf_reset(&buf);
1540 strbuf_addf(&buf, "%s/interactive", merge_dir());
1541 if(file_exists(buf.buf)) {
1542 options.type = REBASE_INTERACTIVE;
1543 options.flags |= REBASE_INTERACTIVE_EXPLICIT;
1544 } else
1545 options.type = REBASE_MERGE;
1546 }
1547 options.state_dir = merge_dir();
1548 }
1549 if (options.type != REBASE_UNSPECIFIED)
1551 in_progress = 1;
1552 total_argc = argc;
1554 argc = parse_options(argc, argv, prefix,
1555 builtin_rebase_options,
1556 builtin_rebase_usage, 0);
1557 if (action != ACTION_NONE && total_argc != 2) {
1559 usage_with_options(builtin_rebase_usage,
1560 builtin_rebase_options);
1561 }
1562 if (argc > 2)
1564 usage_with_options(builtin_rebase_usage,
1565 builtin_rebase_options);
1566 if (action != ACTION_NONE && !in_progress)
1568 die(_("No rebase in progress?"));
1569 setenv(GIT_REFLOG_ACTION_ENVIRONMENT, "rebase", 0);
1570 if (action == ACTION_EDIT_TODO && !is_interactive(&options))
1572 die(_("The --edit-todo action can only be used during "
1573 "interactive rebase."));
1574 if (trace2_is_enabled()) {
1576 if (is_interactive(&options))
1577 trace2_cmd_mode("interactive");
1578 else if (exec.nr)
1579 trace2_cmd_mode("interactive-exec");
1580 else
1581 trace2_cmd_mode(action_names[action]);
1582 }
1583 switch (action) {
1585 case ACTION_CONTINUE: {
1586 struct object_id head;
1587 struct lock_file lock_file = LOCK_INIT;
1588 int fd;
1589 options.action = "continue";
1591 set_reflog_action(&options);
1592 /* Sanity check */
1594 if (get_oid("HEAD", &head))
1595 die(_("Cannot read HEAD"));
1596 fd = hold_locked_index(&lock_file, 0);
1598 if (repo_read_index(the_repository) < 0)
1599 die(_("could not read index"));
1600 refresh_index(the_repository->index, REFRESH_QUIET, NULL, NULL,
1601 NULL);
1602 if (0 <= fd)
1603 repo_update_index_if_able(the_repository, &lock_file);
1604 rollback_lock_file(&lock_file);
1605 if (has_unstaged_changes(the_repository, 1)) {
1607 puts(_("You must edit all merge conflicts and then\n"
1608 "mark them as resolved using git add"));
1609 exit(1);
1610 }
1611 if (read_basic_state(&options))
1612 exit(1);
1613 goto run_rebase;
1614 }
1615 case ACTION_SKIP: {
1616 struct string_list merge_rr = STRING_LIST_INIT_DUP;
1617 options.action = "skip";
1619 set_reflog_action(&options);
1620 rerere_clear(the_repository, &merge_rr);
1622 string_list_clear(&merge_rr, 1);
1623 if (reset_head(NULL, "reset", NULL, RESET_HEAD_HARD,
1625 NULL, NULL) < 0)
1626 die(_("could not discard worktree changes"));
1627 remove_branch_state(the_repository);
1628 if (read_basic_state(&options))
1629 exit(1);
1630 goto run_rebase;
1631 }
1632 case ACTION_ABORT: {
1633 struct string_list merge_rr = STRING_LIST_INIT_DUP;
1634 options.action = "abort";
1635 set_reflog_action(&options);
1636 rerere_clear(the_repository, &merge_rr);
1638 string_list_clear(&merge_rr, 1);
1639 if (read_basic_state(&options))
1641 exit(1);
1642 if (reset_head(&options.orig_head, "reset",
1643 options.head_name, RESET_HEAD_HARD,
1644 NULL, NULL) < 0)
1645 die(_("could not move back to %s"),
1646 oid_to_hex(&options.orig_head));
1647 remove_branch_state(the_repository);
1648 ret = finish_rebase(&options);
1649 goto cleanup;
1650 }
1651 case ACTION_QUIT: {
1652 strbuf_reset(&buf);
1653 strbuf_addstr(&buf, options.state_dir);
1654 ret = !!remove_dir_recursively(&buf, 0);
1655 if (ret)
1656 die(_("could not remove '%s'"), options.state_dir);
1657 goto cleanup;
1658 }
1659 case ACTION_EDIT_TODO:
1660 options.action = "edit-todo";
1661 options.dont_finish_rebase = 1;
1662 goto run_rebase;
1663 case ACTION_SHOW_CURRENT_PATCH:
1664 options.action = "show-current-patch";
1665 options.dont_finish_rebase = 1;
1666 goto run_rebase;
1667 case ACTION_NONE:
1668 break;
1669 default:
1670 BUG("action: %d", action);
1671 }
1672 /* Make sure no rebase is in progress */
1674 if (in_progress) {
1675 const char *last_slash = strrchr(options.state_dir, '/');
1676 const char *state_dir_base =
1677 last_slash ? last_slash + 1 : options.state_dir;
1678 const char *cmd_live_rebase =
1679 "git rebase (--continue | --abort | --skip)";
1680 strbuf_reset(&buf);
1681 strbuf_addf(&buf, "rm -fr \"%s\"", options.state_dir);
1682 die(_("It seems that there is already a %s directory, and\n"
1683 "I wonder if you are in the middle of another rebase. "
1684 "If that is the\n"
1685 "case, please try\n\t%s\n"
1686 "If that is not the case, please\n\t%s\n"
1687 "and run me again. I am stopping in case you still "
1688 "have something\n"
1689 "valuable there.\n"),
1690 state_dir_base, cmd_live_rebase, buf.buf);
1691 }
1692 for (i = 0; i < options.git_am_opts.argc; i++) {
1694 const char *option = options.git_am_opts.argv[i], *p;
1695 if (!strcmp(option, "--committer-date-is-author-date") ||
1696 !strcmp(option, "--ignore-date") ||
1697 !strcmp(option, "--whitespace=fix") ||
1698 !strcmp(option, "--whitespace=strip"))
1699 options.flags |= REBASE_FORCE;
1700 else if (skip_prefix(option, "-C", &p)) {
1701 while (*p)
1702 if (!isdigit(*(p++)))
1703 die(_("switch `C' expects a "
1704 "numerical value"));
1705 } else if (skip_prefix(option, "--whitespace=", &p)) {
1706 if (*p && strcmp(p, "warn") && strcmp(p, "nowarn") &&
1707 strcmp(p, "error") && strcmp(p, "error-all"))
1708 die("Invalid whitespace option: '%s'", p);
1709 }
1710 }
1711 for (i = 0; i < exec.nr; i++)
1713 if (check_exec_cmd(exec.items[i].string))
1714 exit(1);
1715 if (!(options.flags & REBASE_NO_QUIET))
1717 argv_array_push(&options.git_am_opts, "-q");
1718 if (options.keep_empty)
1720 imply_interactive(&options, "--keep-empty");
1721 if (gpg_sign) {
1723 free(options.gpg_sign_opt);
1724 options.gpg_sign_opt = xstrfmt("-S%s", gpg_sign);
1725 }
1726 if (exec.nr) {
1728 int i;
1729 imply_interactive(&options, "--exec");
1731 strbuf_reset(&buf);
1733 for (i = 0; i < exec.nr; i++)
1734 strbuf_addf(&buf, "exec %s\n", exec.items[i].string);
1735 options.cmd = xstrdup(buf.buf);
1736 }
1737 if (rebase_merges) {
1739 if (!*rebase_merges)
1740 ; /* default mode; do nothing */
1741 else if (!strcmp("rebase-cousins", rebase_merges))
1742 options.rebase_cousins = 1;
1743 else if (strcmp("no-rebase-cousins", rebase_merges))
1744 die(_("Unknown mode: %s"), rebase_merges);
1745 options.rebase_merges = 1;
1746 imply_interactive(&options, "--rebase-merges");
1747 }
1748 if (strategy_options.nr) {
1750 int i;
1751 if (!options.strategy)
1753 options.strategy = "recursive";
1754 strbuf_reset(&buf);
1756 for (i = 0; i < strategy_options.nr; i++)
1757 strbuf_addf(&buf, " --%s",
1758 strategy_options.items[i].string);
1759 options.strategy_opts = xstrdup(buf.buf);
1760 }
1761 if (options.strategy) {
1763 options.strategy = xstrdup(options.strategy);
1764 switch (options.type) {
1765 case REBASE_AM:
1766 die(_("--strategy requires --merge or --interactive"));
1767 case REBASE_MERGE:
1768 case REBASE_INTERACTIVE:
1769 case REBASE_PRESERVE_MERGES:
1770 /* compatible */
1771 break;
1772 case REBASE_UNSPECIFIED:
1773 options.type = REBASE_MERGE;
1774 break;
1775 default:
1776 BUG("unhandled rebase type (%d)", options.type);
1777 }
1778 }
1779 if (options.type == REBASE_MERGE)
1781 imply_interactive(&options, "--merge");
1782 if (options.root && !options.onto_name)
1784 imply_interactive(&options, "--root without --onto");
1785 if (isatty(2) && options.flags & REBASE_NO_QUIET)
1787 strbuf_addstr(&options.git_format_patch_opt, " --progress");
1788 switch (options.type) {
1790 case REBASE_MERGE:
1791 case REBASE_INTERACTIVE:
1792 case REBASE_PRESERVE_MERGES:
1793 options.state_dir = merge_dir();
1794 break;
1795 case REBASE_AM:
1796 options.state_dir = apply_dir();
1797 break;
1798 default:
1799 /* the default rebase backend is `--am` */
1800 options.type = REBASE_AM;
1801 options.state_dir = apply_dir();
1802 break;
1803 }
1804 if (options.reschedule_failed_exec && !is_interactive(&options))
1806 die(_("%s requires an interactive rebase"), "--reschedule-failed-exec");
1807 if (options.git_am_opts.argc) {
1809 /* all am options except -q are compatible only with --am */
1810 for (i = options.git_am_opts.argc - 1; i >= 0; i--)
1811 if (strcmp(options.git_am_opts.argv[i], "-q"))
1812 break;
1813 if (is_interactive(&options) && i >= 0)
1815 die(_("cannot combine am options with either "
1816 "interactive or merge options"));
1817 }
1818 if (options.signoff) {
1820 if (options.type == REBASE_PRESERVE_MERGES)
1821 die("cannot combine '--signoff' with "
1822 "'--preserve-merges'");
1823 argv_array_push(&options.git_am_opts, "--signoff");
1824 options.flags |= REBASE_FORCE;
1825 }
1826 if (options.type == REBASE_PRESERVE_MERGES) {
1828 /*
1829 * Note: incompatibility with --signoff handled in signoff block above
1830 * Note: incompatibility with --interactive is just a strong warning;
1831 * git-rebase.txt caveats with "unless you know what you are doing"
1832 */
1833 if (options.rebase_merges)
1834 die(_("cannot combine '--preserve-merges' with "
1835 "'--rebase-merges'"));
1836 if (options.reschedule_failed_exec)
1838 die(_("error: cannot combine '--preserve-merges' with "
1839 "'--reschedule-failed-exec'"));
1840 }
1841 if (options.rebase_merges) {
1843 if (strategy_options.nr)
1844 die(_("cannot combine '--rebase-merges' with "
1845 "'--strategy-option'"));
1846 if (options.strategy)
1847 die(_("cannot combine '--rebase-merges' with "
1848 "'--strategy'"));
1849 }
1850 if (!options.root) {
1852 if (argc < 1) {
1853 struct branch *branch;
1854 branch = branch_get(NULL);
1856 options.upstream_name = branch_get_upstream(branch,
1857 NULL);
1858 if (!options.upstream_name)
1859 error_on_missing_default_upstream();
1860 if (fork_point < 0)
1861 fork_point = 1;
1862 } else {
1863 options.upstream_name = argv[0];
1864 argc--;
1865 argv++;
1866 if (!strcmp(options.upstream_name, "-"))
1867 options.upstream_name = "@{-1}";
1868 }
1869 options.upstream = peel_committish(options.upstream_name);
1870 if (!options.upstream)
1871 die(_("invalid upstream '%s'"), options.upstream_name);
1872 options.upstream_arg = options.upstream_name;
1873 } else {
1874 if (!options.onto_name) {
1875 if (commit_tree("", 0, the_hash_algo->empty_tree, NULL,
1876 &squash_onto, NULL, NULL) < 0)
1877 die(_("Could not create new root commit"));
1878 options.squash_onto = &squash_onto;
1879 options.onto_name = squash_onto_name =
1880 xstrdup(oid_to_hex(&squash_onto));
1881 }
1882 options.upstream_name = NULL;
1883 options.upstream = NULL;
1884 if (argc > 1)
1885 usage_with_options(builtin_rebase_usage,
1886 builtin_rebase_options);
1887 options.upstream_arg = "--root";
1888 }
1889 /* Make sure the branch to rebase onto is valid. */
1891 if (!options.onto_name)
1892 options.onto_name = options.upstream_name;
1893 if (strstr(options.onto_name, "...")) {
1894 if (get_oid_mb(options.onto_name, &merge_base) < 0)
1895 die(_("'%s': need exactly one merge base"),
1896 options.onto_name);
1897 options.onto = lookup_commit_or_die(&merge_base,
1898 options.onto_name);
1899 } else {
1900 options.onto = peel_committish(options.onto_name);
1901 if (!options.onto)
1902 die(_("Does not point to a valid commit '%s'"),
1903 options.onto_name);
1904 }
1905 /*
1907 * If the branch to rebase is given, that is the branch we will rebase
1908 * branch_name -- branch/commit being rebased, or
1909 * HEAD (already detached)
1910 * orig_head -- commit object name of tip of the branch before rebasing
1911 * head_name -- refs/heads/<that-branch> or NULL (detached HEAD)
1912 */
1913 if (argc == 1) {
1914 /* Is it "rebase other branchname" or "rebase other commit"? */
1915 branch_name = argv[0];
1916 options.switch_to = argv[0];
1917 /* Is it a local branch? */
1919 strbuf_reset(&buf);
1920 strbuf_addf(&buf, "refs/heads/%s", branch_name);
1921 if (!read_ref(buf.buf, &options.orig_head))
1922 options.head_name = xstrdup(buf.buf);
1923 /* If not is it a valid ref (branch or commit)? */
1924 else if (!get_oid(branch_name, &options.orig_head))
1925 options.head_name = NULL;
1926 else
1927 die(_("fatal: no such branch/commit '%s'"),
1928 branch_name);
1929 } else if (argc == 0) {
1930 /* Do not need to switch branches, we are already on it. */
1931 options.head_name =
1932 xstrdup_or_null(resolve_ref_unsafe("HEAD", 0, NULL,
1933 &flags));
1934 if (!options.head_name)
1935 die(_("No such ref: %s"), "HEAD");
1936 if (flags & REF_ISSYMREF) {
1937 if (!skip_prefix(options.head_name,
1938 "refs/heads/", &branch_name))
1939 branch_name = options.head_name;
1940 } else {
1942 free(options.head_name);
1943 options.head_name = NULL;
1944 branch_name = "HEAD";
1945 }
1946 if (get_oid("HEAD", &options.orig_head))
1947 die(_("Could not resolve HEAD to a revision"));
1948 } else
1949 BUG("unexpected number of arguments left to parse");
1950 if (fork_point > 0) {
1952 struct commit *head =
1953 lookup_commit_reference(the_repository,
1954 &options.orig_head);
1955 options.restrict_revision =
1956 get_fork_point(options.upstream_name, head);
1957 }
1958 if (repo_read_index(the_repository) < 0)
1960 die(_("could not read index"));
1961 if (options.autostash) {
1963 struct lock_file lock_file = LOCK_INIT;
1964 int fd;
1965 fd = hold_locked_index(&lock_file, 0);
1967 refresh_cache(REFRESH_QUIET);
1968 if (0 <= fd)
1969 repo_update_index_if_able(the_repository, &lock_file);
1970 rollback_lock_file(&lock_file);
1971 if (has_unstaged_changes(the_repository, 1) ||
1973 has_uncommitted_changes(the_repository, 1)) {
1974 const char *autostash =
1975 state_dir_path("autostash", &options);
1976 struct child_process stash = CHILD_PROCESS_INIT;
1977 struct object_id oid;
1978 struct commit *head =
1979 lookup_commit_reference(the_repository,
1980 &options.orig_head);
1981 argv_array_pushl(&stash.args,
1983 "stash", "create", "autostash", NULL);
1984 stash.git_cmd = 1;
1985 stash.no_stdin = 1;
1986 strbuf_reset(&buf);
1987 if (capture_command(&stash, &buf, GIT_MAX_HEXSZ))
1988 die(_("Cannot autostash"));
1989 strbuf_trim_trailing_newline(&buf);
1990 if (get_oid(buf.buf, &oid))
1991 die(_("Unexpected stash response: '%s'"),
1992 buf.buf);
1993 strbuf_reset(&buf);
1994 strbuf_add_unique_abbrev(&buf, &oid, DEFAULT_ABBREV);
1995 if (safe_create_leading_directories_const(autostash))
1997 die(_("Could not create directory for '%s'"),
1998 options.state_dir);
1999 write_file(autostash, "%s", oid_to_hex(&oid));
2000 printf(_("Created autostash: %s\n"), buf.buf);
2001 if (reset_head(&head->object.oid, "reset --hard",
2002 NULL, RESET_HEAD_HARD, NULL, NULL) < 0)
2003 die(_("could not reset --hard"));
2004 printf(_("HEAD is now at %s"),
2005 find_unique_abbrev(&head->object.oid,
2006 DEFAULT_ABBREV));
2007 strbuf_reset(&buf);
2008 pp_commit_easy(CMIT_FMT_ONELINE, head, &buf);
2009 if (buf.len > 0)
2010 printf(" %s", buf.buf);
2011 putchar('\n');
2012 if (discard_index(the_repository->index) < 0 ||
2014 repo_read_index(the_repository) < 0)
2015 die(_("could not read index"));
2016 }
2017 }
2018 if (require_clean_work_tree(the_repository, "rebase",
2020 _("Please commit or stash them."), 1, 1)) {
2021 ret = 1;
2022 goto cleanup;
2023 }
2024 /*
2026 * Now we are rebasing commits upstream..orig_head (or with --root,
2027 * everything leading up to orig_head) on top of onto.
2028 */
2029 /*
2031 * Check if we are already based on onto with linear history,
2032 * but this should be done only when upstream and onto are the same
2033 * and if this is not an interactive rebase.
2034 */
2035 if (can_fast_forward(options.onto, &options.orig_head, &merge_base) &&
2036 !is_interactive(&options) && !options.restrict_revision &&
2037 options.upstream &&
2038 !oidcmp(&options.upstream->object.oid, &options.onto->object.oid)) {
2039 int flag;
2040 if (!(options.flags & REBASE_FORCE)) {
2042 /* Lazily switch to the target branch if needed... */
2043 if (options.switch_to) {
2044 struct object_id oid;
2045 if (get_oid(options.switch_to, &oid) < 0) {
2047 ret = !!error(_("could not parse '%s'"),
2048 options.switch_to);
2049 goto cleanup;
2050 }
2051 strbuf_reset(&buf);
2053 strbuf_addf(&buf, "%s: checkout %s",
2054 getenv(GIT_REFLOG_ACTION_ENVIRONMENT),
2055 options.switch_to);
2056 if (reset_head(&oid, "checkout",
2057 options.head_name,
2058 RESET_HEAD_RUN_POST_CHECKOUT_HOOK,
2059 NULL, buf.buf) < 0) {
2060 ret = !!error(_("could not switch to "
2061 "%s"),
2062 options.switch_to);
2063 goto cleanup;
2064 }
2065 }
2066 if (!(options.flags & REBASE_NO_QUIET))
2068 ; /* be quiet */
2069 else if (!strcmp(branch_name, "HEAD") &&
2070 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
2071 puts(_("HEAD is up to date."));
2072 else
2073 printf(_("Current branch %s is up to date.\n"),
2074 branch_name);
2075 ret = !!finish_rebase(&options);
2076 goto cleanup;
2077 } else if (!(options.flags & REBASE_NO_QUIET))
2078 ; /* be quiet */
2079 else if (!strcmp(branch_name, "HEAD") &&
2080 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
2081 puts(_("HEAD is up to date, rebase forced."));
2082 else
2083 printf(_("Current branch %s is up to date, rebase "
2084 "forced.\n"), branch_name);
2085 }
2086 /* If a hook exists, give it a chance to interrupt*/
2088 if (!ok_to_skip_pre_rebase &&
2089 run_hook_le(NULL, "pre-rebase", options.upstream_arg,
2090 argc ? argv[0] : NULL, NULL))
2091 die(_("The pre-rebase hook refused to rebase."));
2092 if (options.flags & REBASE_DIFFSTAT) {
2094 struct diff_options opts;
2095 if (options.flags & REBASE_VERBOSE) {
2097 if (is_null_oid(&merge_base))
2098 printf(_("Changes to %s:\n"),
2099 oid_to_hex(&options.onto->object.oid));
2100 else
2101 printf(_("Changes from %s to %s:\n"),
2102 oid_to_hex(&merge_base),
2103 oid_to_hex(&options.onto->object.oid));
2104 }
2105 /* We want color (if set), but no pager */
2107 diff_setup(&opts);
2108 opts.stat_width = -1; /* use full terminal width */
2109 opts.stat_graph_width = -1; /* respect statGraphWidth config */
2110 opts.output_format |=
2111 DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
2112 opts.detect_rename = DIFF_DETECT_RENAME;
2113 diff_setup_done(&opts);
2114 diff_tree_oid(is_null_oid(&merge_base) ?
2115 the_hash_algo->empty_tree : &merge_base,
2116 &options.onto->object.oid, "", &opts);
2117 diffcore_std(&opts);
2118 diff_flush(&opts);
2119 }
2120 if (is_interactive(&options))
2122 goto run_rebase;
2123 /* Detach HEAD and reset the tree */
2125 if (options.flags & REBASE_NO_QUIET)
2126 printf(_("First, rewinding head to replay your work on top of "
2127 "it...\n"));
2128 strbuf_addf(&msg, "%s: checkout %s",
2130 getenv(GIT_REFLOG_ACTION_ENVIRONMENT), options.onto_name);
2131 if (reset_head(&options.onto->object.oid, "checkout", NULL,
2132 RESET_HEAD_DETACH | RESET_HEAD_RUN_POST_CHECKOUT_HOOK,
2133 NULL, msg.buf))
2134 die(_("Could not detach HEAD"));
2135 strbuf_release(&msg);
2136 /*
2138 * If the onto is a proper descendant of the tip of the branch, then
2139 * we just fast-forwarded.
2140 */
2141 strbuf_reset(&msg);
2142 if (!oidcmp(&merge_base, &options.orig_head)) {
2143 printf(_("Fast-forwarded %s to %s.\n"),
2144 branch_name, options.onto_name);
2145 strbuf_addf(&msg, "rebase finished: %s onto %s",
2146 options.head_name ? options.head_name : "detached HEAD",
2147 oid_to_hex(&options.onto->object.oid));
2148 reset_head(NULL, "Fast-forwarded", options.head_name, 0,
2149 "HEAD", msg.buf);
2150 strbuf_release(&msg);
2151 ret = !!finish_rebase(&options);
2152 goto cleanup;
2153 }
2154 strbuf_addf(&revisions, "%s..%s",
2156 options.root ? oid_to_hex(&options.onto->object.oid) :
2157 (options.restrict_revision ?
2158 oid_to_hex(&options.restrict_revision->object.oid) :
2159 oid_to_hex(&options.upstream->object.oid)),
2160 oid_to_hex(&options.orig_head));
2161 options.revisions = revisions.buf;
2163run_rebase:
2165 ret = !!run_specific_rebase(&options, action);
2166cleanup:
2168 strbuf_release(&buf);
2169 strbuf_release(&revisions);
2170 free(options.head_name);
2171 free(options.gpg_sign_opt);
2172 free(options.cmd);
2173 free(squash_onto_name);
2174 return ret;
2175}