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[thirdparty/git.git] / builtin / rebase.c
1 /*
2 * "git rebase" builtin command
3 *
4 * Copyright (c) 2018 Pratik Karki
5 */
6
7 #define USE_THE_INDEX_COMPATIBILITY_MACROS
8 #include "builtin.h"
9 #include "run-command.h"
10 #include "exec-cmd.h"
11 #include "strvec.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"
30 #include "reset.h"
31
32 #define DEFAULT_REFLOG_ACTION "rebase"
33
34 static char const * const builtin_rebase_usage[] = {
35 N_("git rebase [-i] [options] [--exec <cmd>] "
36 "[--onto <newbase> | --keep-base] [<upstream> [<branch>]]"),
37 N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] "
38 "--root [<branch>]"),
39 N_("git rebase --continue | --abort | --skip | --edit-todo"),
40 NULL
41 };
42
43 static GIT_PATH_FUNC(path_squash_onto, "rebase-merge/squash-onto")
44 static GIT_PATH_FUNC(path_interactive, "rebase-merge/interactive")
45 static GIT_PATH_FUNC(apply_dir, "rebase-apply")
46 static GIT_PATH_FUNC(merge_dir, "rebase-merge")
47
48 enum rebase_type {
49 REBASE_UNSPECIFIED = -1,
50 REBASE_APPLY,
51 REBASE_MERGE,
52 REBASE_PRESERVE_MERGES
53 };
54
55 enum empty_type {
56 EMPTY_UNSPECIFIED = -1,
57 EMPTY_DROP,
58 EMPTY_KEEP,
59 EMPTY_ASK
60 };
61
62 struct rebase_options {
63 enum rebase_type type;
64 enum empty_type empty;
65 const char *default_backend;
66 const char *state_dir;
67 struct commit *upstream;
68 const char *upstream_name;
69 const char *upstream_arg;
70 char *head_name;
71 struct object_id orig_head;
72 struct commit *onto;
73 const char *onto_name;
74 const char *revisions;
75 const char *switch_to;
76 int root, root_with_onto;
77 struct object_id *squash_onto;
78 struct commit *restrict_revision;
79 int dont_finish_rebase;
80 enum {
81 REBASE_NO_QUIET = 1<<0,
82 REBASE_VERBOSE = 1<<1,
83 REBASE_DIFFSTAT = 1<<2,
84 REBASE_FORCE = 1<<3,
85 REBASE_INTERACTIVE_EXPLICIT = 1<<4,
86 } flags;
87 struct strvec git_am_opts;
88 const char *action;
89 int signoff;
90 int allow_rerere_autoupdate;
91 int keep_empty;
92 int autosquash;
93 char *gpg_sign_opt;
94 int autostash;
95 int committer_date_is_author_date;
96 int ignore_date;
97 char *cmd;
98 int allow_empty_message;
99 int rebase_merges, rebase_cousins;
100 char *strategy, *strategy_opts;
101 struct strbuf git_format_patch_opt;
102 int reschedule_failed_exec;
103 int use_legacy_rebase;
104 int reapply_cherry_picks;
105 };
106
107 #define REBASE_OPTIONS_INIT { \
108 .type = REBASE_UNSPECIFIED, \
109 .empty = EMPTY_UNSPECIFIED, \
110 .keep_empty = 1, \
111 .default_backend = "merge", \
112 .flags = REBASE_NO_QUIET, \
113 .git_am_opts = STRVEC_INIT, \
114 .git_format_patch_opt = STRBUF_INIT \
115 }
116
117 static struct replay_opts get_replay_opts(const struct rebase_options *opts)
118 {
119 struct replay_opts replay = REPLAY_OPTS_INIT;
120
121 replay.action = REPLAY_INTERACTIVE_REBASE;
122 replay.strategy = NULL;
123 sequencer_init_config(&replay);
124
125 replay.signoff = opts->signoff;
126 replay.allow_ff = !(opts->flags & REBASE_FORCE);
127 if (opts->allow_rerere_autoupdate)
128 replay.allow_rerere_auto = opts->allow_rerere_autoupdate;
129 replay.allow_empty = 1;
130 replay.allow_empty_message = opts->allow_empty_message;
131 replay.drop_redundant_commits = (opts->empty == EMPTY_DROP);
132 replay.keep_redundant_commits = (opts->empty == EMPTY_KEEP);
133 replay.quiet = !(opts->flags & REBASE_NO_QUIET);
134 replay.verbose = opts->flags & REBASE_VERBOSE;
135 replay.reschedule_failed_exec = opts->reschedule_failed_exec;
136 replay.committer_date_is_author_date =
137 opts->committer_date_is_author_date;
138 replay.ignore_date = opts->ignore_date;
139 replay.gpg_sign = xstrdup_or_null(opts->gpg_sign_opt);
140 if (opts->strategy)
141 replay.strategy = opts->strategy;
142 else if (!replay.strategy && replay.default_strategy) {
143 replay.strategy = replay.default_strategy;
144 replay.default_strategy = NULL;
145 }
146
147 if (opts->strategy_opts)
148 parse_strategy_opts(&replay, opts->strategy_opts);
149
150 if (opts->squash_onto) {
151 oidcpy(&replay.squash_onto, opts->squash_onto);
152 replay.have_squash_onto = 1;
153 }
154
155 return replay;
156 }
157
158 enum action {
159 ACTION_NONE = 0,
160 ACTION_CONTINUE,
161 ACTION_SKIP,
162 ACTION_ABORT,
163 ACTION_QUIT,
164 ACTION_EDIT_TODO,
165 ACTION_SHOW_CURRENT_PATCH,
166 ACTION_SHORTEN_OIDS,
167 ACTION_EXPAND_OIDS,
168 ACTION_CHECK_TODO_LIST,
169 ACTION_REARRANGE_SQUASH,
170 ACTION_ADD_EXEC
171 };
172
173 static const char *action_names[] = { "undefined",
174 "continue",
175 "skip",
176 "abort",
177 "quit",
178 "edit_todo",
179 "show_current_patch" };
180
181 static int add_exec_commands(struct string_list *commands)
182 {
183 const char *todo_file = rebase_path_todo();
184 struct todo_list todo_list = TODO_LIST_INIT;
185 int res;
186
187 if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
188 return error_errno(_("could not read '%s'."), todo_file);
189
190 if (todo_list_parse_insn_buffer(the_repository, todo_list.buf.buf,
191 &todo_list)) {
192 todo_list_release(&todo_list);
193 return error(_("unusable todo list: '%s'"), todo_file);
194 }
195
196 todo_list_add_exec_commands(&todo_list, commands);
197 res = todo_list_write_to_file(the_repository, &todo_list,
198 todo_file, NULL, NULL, -1, 0);
199 todo_list_release(&todo_list);
200
201 if (res)
202 return error_errno(_("could not write '%s'."), todo_file);
203 return 0;
204 }
205
206 static int rearrange_squash_in_todo_file(void)
207 {
208 const char *todo_file = rebase_path_todo();
209 struct todo_list todo_list = TODO_LIST_INIT;
210 int res = 0;
211
212 if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
213 return error_errno(_("could not read '%s'."), todo_file);
214 if (todo_list_parse_insn_buffer(the_repository, todo_list.buf.buf,
215 &todo_list)) {
216 todo_list_release(&todo_list);
217 return error(_("unusable todo list: '%s'"), todo_file);
218 }
219
220 res = todo_list_rearrange_squash(&todo_list);
221 if (!res)
222 res = todo_list_write_to_file(the_repository, &todo_list,
223 todo_file, NULL, NULL, -1, 0);
224
225 todo_list_release(&todo_list);
226
227 if (res)
228 return error_errno(_("could not write '%s'."), todo_file);
229 return 0;
230 }
231
232 static int transform_todo_file(unsigned flags)
233 {
234 const char *todo_file = rebase_path_todo();
235 struct todo_list todo_list = TODO_LIST_INIT;
236 int res;
237
238 if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
239 return error_errno(_("could not read '%s'."), todo_file);
240
241 if (todo_list_parse_insn_buffer(the_repository, todo_list.buf.buf,
242 &todo_list)) {
243 todo_list_release(&todo_list);
244 return error(_("unusable todo list: '%s'"), todo_file);
245 }
246
247 res = todo_list_write_to_file(the_repository, &todo_list, todo_file,
248 NULL, NULL, -1, flags);
249 todo_list_release(&todo_list);
250
251 if (res)
252 return error_errno(_("could not write '%s'."), todo_file);
253 return 0;
254 }
255
256 static int edit_todo_file(unsigned flags)
257 {
258 const char *todo_file = rebase_path_todo();
259 struct todo_list todo_list = TODO_LIST_INIT,
260 new_todo = TODO_LIST_INIT;
261 int res = 0;
262
263 if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
264 return error_errno(_("could not read '%s'."), todo_file);
265
266 strbuf_stripspace(&todo_list.buf, 1);
267 res = edit_todo_list(the_repository, &todo_list, &new_todo, NULL, NULL, flags);
268 if (!res && todo_list_write_to_file(the_repository, &new_todo, todo_file,
269 NULL, NULL, -1, flags & ~(TODO_LIST_SHORTEN_IDS)))
270 res = error_errno(_("could not write '%s'"), todo_file);
271
272 todo_list_release(&todo_list);
273 todo_list_release(&new_todo);
274
275 return res;
276 }
277
278 static int get_revision_ranges(struct commit *upstream, struct commit *onto,
279 struct object_id *orig_head, char **revisions,
280 char **shortrevisions)
281 {
282 struct commit *base_rev = upstream ? upstream : onto;
283 const char *shorthead;
284
285 *revisions = xstrfmt("%s...%s", oid_to_hex(&base_rev->object.oid),
286 oid_to_hex(orig_head));
287
288 shorthead = find_unique_abbrev(orig_head, DEFAULT_ABBREV);
289
290 if (upstream) {
291 const char *shortrev;
292
293 shortrev = find_unique_abbrev(&base_rev->object.oid,
294 DEFAULT_ABBREV);
295
296 *shortrevisions = xstrfmt("%s..%s", shortrev, shorthead);
297 } else
298 *shortrevisions = xstrdup(shorthead);
299
300 return 0;
301 }
302
303 static int init_basic_state(struct replay_opts *opts, const char *head_name,
304 struct commit *onto,
305 const struct object_id *orig_head)
306 {
307 FILE *interactive;
308
309 if (!is_directory(merge_dir()) && mkdir_in_gitdir(merge_dir()))
310 return error_errno(_("could not create temporary %s"), merge_dir());
311
312 delete_reflog("REBASE_HEAD");
313
314 interactive = fopen(path_interactive(), "w");
315 if (!interactive)
316 return error_errno(_("could not mark as interactive"));
317 fclose(interactive);
318
319 return write_basic_state(opts, head_name, onto, orig_head);
320 }
321
322 static void split_exec_commands(const char *cmd, struct string_list *commands)
323 {
324 if (cmd && *cmd) {
325 string_list_split(commands, cmd, '\n', -1);
326
327 /* rebase.c adds a new line to cmd after every command,
328 * so here the last command is always empty */
329 string_list_remove_empty_items(commands, 0);
330 }
331 }
332
333 static int do_interactive_rebase(struct rebase_options *opts, unsigned flags)
334 {
335 int ret;
336 char *revisions = NULL, *shortrevisions = NULL;
337 struct strvec make_script_args = STRVEC_INIT;
338 struct todo_list todo_list = TODO_LIST_INIT;
339 struct replay_opts replay = get_replay_opts(opts);
340 struct string_list commands = STRING_LIST_INIT_DUP;
341
342 if (get_revision_ranges(opts->upstream, opts->onto, &opts->orig_head,
343 &revisions, &shortrevisions))
344 return -1;
345
346 if (init_basic_state(&replay,
347 opts->head_name ? opts->head_name : "detached HEAD",
348 opts->onto, &opts->orig_head)) {
349 free(revisions);
350 free(shortrevisions);
351
352 return -1;
353 }
354
355 if (!opts->upstream && opts->squash_onto)
356 write_file(path_squash_onto(), "%s\n",
357 oid_to_hex(opts->squash_onto));
358
359 strvec_pushl(&make_script_args, "", revisions, NULL);
360 if (opts->restrict_revision)
361 strvec_pushf(&make_script_args, "^%s",
362 oid_to_hex(&opts->restrict_revision->object.oid));
363
364 ret = sequencer_make_script(the_repository, &todo_list.buf,
365 make_script_args.nr, make_script_args.v,
366 flags);
367
368 if (ret)
369 error(_("could not generate todo list"));
370 else {
371 discard_cache();
372 if (todo_list_parse_insn_buffer(the_repository, todo_list.buf.buf,
373 &todo_list))
374 BUG("unusable todo list");
375
376 split_exec_commands(opts->cmd, &commands);
377 ret = complete_action(the_repository, &replay, flags,
378 shortrevisions, opts->onto_name, opts->onto,
379 &opts->orig_head, &commands, opts->autosquash,
380 &todo_list);
381 }
382
383 string_list_clear(&commands, 0);
384 free(revisions);
385 free(shortrevisions);
386 todo_list_release(&todo_list);
387 strvec_clear(&make_script_args);
388
389 return ret;
390 }
391
392 static int run_sequencer_rebase(struct rebase_options *opts,
393 enum action command)
394 {
395 unsigned flags = 0;
396 int abbreviate_commands = 0, ret = 0;
397
398 git_config_get_bool("rebase.abbreviatecommands", &abbreviate_commands);
399
400 flags |= opts->keep_empty ? TODO_LIST_KEEP_EMPTY : 0;
401 flags |= abbreviate_commands ? TODO_LIST_ABBREVIATE_CMDS : 0;
402 flags |= opts->rebase_merges ? TODO_LIST_REBASE_MERGES : 0;
403 flags |= opts->rebase_cousins > 0 ? TODO_LIST_REBASE_COUSINS : 0;
404 flags |= opts->root_with_onto ? TODO_LIST_ROOT_WITH_ONTO : 0;
405 flags |= command == ACTION_SHORTEN_OIDS ? TODO_LIST_SHORTEN_IDS : 0;
406 flags |= opts->reapply_cherry_picks ? TODO_LIST_REAPPLY_CHERRY_PICKS : 0;
407
408 switch (command) {
409 case ACTION_NONE: {
410 if (!opts->onto && !opts->upstream)
411 die(_("a base commit must be provided with --upstream or --onto"));
412
413 ret = do_interactive_rebase(opts, flags);
414 break;
415 }
416 case ACTION_SKIP: {
417 struct string_list merge_rr = STRING_LIST_INIT_DUP;
418
419 rerere_clear(the_repository, &merge_rr);
420 }
421 /* fallthrough */
422 case ACTION_CONTINUE: {
423 struct replay_opts replay_opts = get_replay_opts(opts);
424
425 ret = sequencer_continue(the_repository, &replay_opts);
426 break;
427 }
428 case ACTION_EDIT_TODO:
429 ret = edit_todo_file(flags);
430 break;
431 case ACTION_SHOW_CURRENT_PATCH: {
432 struct child_process cmd = CHILD_PROCESS_INIT;
433
434 cmd.git_cmd = 1;
435 strvec_pushl(&cmd.args, "show", "REBASE_HEAD", "--", NULL);
436 ret = run_command(&cmd);
437
438 break;
439 }
440 case ACTION_SHORTEN_OIDS:
441 case ACTION_EXPAND_OIDS:
442 ret = transform_todo_file(flags);
443 break;
444 case ACTION_CHECK_TODO_LIST:
445 ret = check_todo_list_from_file(the_repository);
446 break;
447 case ACTION_REARRANGE_SQUASH:
448 ret = rearrange_squash_in_todo_file();
449 break;
450 case ACTION_ADD_EXEC: {
451 struct string_list commands = STRING_LIST_INIT_DUP;
452
453 split_exec_commands(opts->cmd, &commands);
454 ret = add_exec_commands(&commands);
455 string_list_clear(&commands, 0);
456 break;
457 }
458 default:
459 BUG("invalid command '%d'", command);
460 }
461
462 return ret;
463 }
464
465 static void imply_merge(struct rebase_options *opts, const char *option);
466 static int parse_opt_keep_empty(const struct option *opt, const char *arg,
467 int unset)
468 {
469 struct rebase_options *opts = opt->value;
470
471 BUG_ON_OPT_ARG(arg);
472
473 imply_merge(opts, unset ? "--no-keep-empty" : "--keep-empty");
474 opts->keep_empty = !unset;
475 opts->type = REBASE_MERGE;
476 return 0;
477 }
478
479 static const char * const builtin_rebase_interactive_usage[] = {
480 N_("git rebase--interactive [<options>]"),
481 NULL
482 };
483
484 int cmd_rebase__interactive(int argc, const char **argv, const char *prefix)
485 {
486 struct rebase_options opts = REBASE_OPTIONS_INIT;
487 struct object_id squash_onto = null_oid;
488 enum action command = ACTION_NONE;
489 struct option options[] = {
490 OPT_NEGBIT(0, "ff", &opts.flags, N_("allow fast-forward"),
491 REBASE_FORCE),
492 OPT_CALLBACK_F('k', "keep-empty", &options, NULL,
493 N_("keep commits which start empty"),
494 PARSE_OPT_NOARG | PARSE_OPT_HIDDEN,
495 parse_opt_keep_empty),
496 OPT_BOOL_F(0, "allow-empty-message", &opts.allow_empty_message,
497 N_("allow commits with empty messages"),
498 PARSE_OPT_HIDDEN),
499 OPT_BOOL(0, "rebase-merges", &opts.rebase_merges, N_("rebase merge commits")),
500 OPT_BOOL(0, "rebase-cousins", &opts.rebase_cousins,
501 N_("keep original branch points of cousins")),
502 OPT_BOOL(0, "autosquash", &opts.autosquash,
503 N_("move commits that begin with squash!/fixup!")),
504 OPT_BOOL(0, "signoff", &opts.signoff, N_("sign commits")),
505 OPT_BIT('v', "verbose", &opts.flags,
506 N_("display a diffstat of what changed upstream"),
507 REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT),
508 OPT_CMDMODE(0, "continue", &command, N_("continue rebase"),
509 ACTION_CONTINUE),
510 OPT_CMDMODE(0, "skip", &command, N_("skip commit"), ACTION_SKIP),
511 OPT_CMDMODE(0, "edit-todo", &command, N_("edit the todo list"),
512 ACTION_EDIT_TODO),
513 OPT_CMDMODE(0, "show-current-patch", &command, N_("show the current patch"),
514 ACTION_SHOW_CURRENT_PATCH),
515 OPT_CMDMODE(0, "shorten-ids", &command,
516 N_("shorten commit ids in the todo list"), ACTION_SHORTEN_OIDS),
517 OPT_CMDMODE(0, "expand-ids", &command,
518 N_("expand commit ids in the todo list"), ACTION_EXPAND_OIDS),
519 OPT_CMDMODE(0, "check-todo-list", &command,
520 N_("check the todo list"), ACTION_CHECK_TODO_LIST),
521 OPT_CMDMODE(0, "rearrange-squash", &command,
522 N_("rearrange fixup/squash lines"), ACTION_REARRANGE_SQUASH),
523 OPT_CMDMODE(0, "add-exec-commands", &command,
524 N_("insert exec commands in todo list"), ACTION_ADD_EXEC),
525 { OPTION_CALLBACK, 0, "onto", &opts.onto, N_("onto"), N_("onto"),
526 PARSE_OPT_NONEG, parse_opt_commit, 0 },
527 { OPTION_CALLBACK, 0, "restrict-revision", &opts.restrict_revision,
528 N_("restrict-revision"), N_("restrict revision"),
529 PARSE_OPT_NONEG, parse_opt_commit, 0 },
530 { OPTION_CALLBACK, 0, "squash-onto", &squash_onto, N_("squash-onto"),
531 N_("squash onto"), PARSE_OPT_NONEG, parse_opt_object_id, 0 },
532 { OPTION_CALLBACK, 0, "upstream", &opts.upstream, N_("upstream"),
533 N_("the upstream commit"), PARSE_OPT_NONEG, parse_opt_commit,
534 0 },
535 OPT_STRING(0, "head-name", &opts.head_name, N_("head-name"), N_("head name")),
536 { OPTION_STRING, 'S', "gpg-sign", &opts.gpg_sign_opt, N_("key-id"),
537 N_("GPG-sign commits"),
538 PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
539 OPT_STRING(0, "strategy", &opts.strategy, N_("strategy"),
540 N_("rebase strategy")),
541 OPT_STRING(0, "strategy-opts", &opts.strategy_opts, N_("strategy-opts"),
542 N_("strategy options")),
543 OPT_STRING(0, "switch-to", &opts.switch_to, N_("switch-to"),
544 N_("the branch or commit to checkout")),
545 OPT_STRING(0, "onto-name", &opts.onto_name, N_("onto-name"), N_("onto name")),
546 OPT_STRING(0, "cmd", &opts.cmd, N_("cmd"), N_("the command to run")),
547 OPT_RERERE_AUTOUPDATE(&opts.allow_rerere_autoupdate),
548 OPT_BOOL(0, "reschedule-failed-exec", &opts.reschedule_failed_exec,
549 N_("automatically re-schedule any `exec` that fails")),
550 OPT_END()
551 };
552
553 opts.rebase_cousins = -1;
554
555 if (argc == 1)
556 usage_with_options(builtin_rebase_interactive_usage, options);
557
558 argc = parse_options(argc, argv, prefix, options,
559 builtin_rebase_interactive_usage, PARSE_OPT_KEEP_ARGV0);
560
561 if (!is_null_oid(&squash_onto))
562 opts.squash_onto = &squash_onto;
563
564 if (opts.rebase_cousins >= 0 && !opts.rebase_merges)
565 warning(_("--[no-]rebase-cousins has no effect without "
566 "--rebase-merges"));
567
568 return !!run_sequencer_rebase(&opts, command);
569 }
570
571 static int is_merge(struct rebase_options *opts)
572 {
573 return opts->type == REBASE_MERGE ||
574 opts->type == REBASE_PRESERVE_MERGES;
575 }
576
577 static void imply_merge(struct rebase_options *opts, const char *option)
578 {
579 switch (opts->type) {
580 case REBASE_APPLY:
581 die(_("%s requires the merge backend"), option);
582 break;
583 case REBASE_MERGE:
584 case REBASE_PRESERVE_MERGES:
585 break;
586 default:
587 opts->type = REBASE_MERGE; /* implied */
588 break;
589 }
590 }
591
592 /* Returns the filename prefixed by the state_dir */
593 static const char *state_dir_path(const char *filename, struct rebase_options *opts)
594 {
595 static struct strbuf path = STRBUF_INIT;
596 static size_t prefix_len;
597
598 if (!prefix_len) {
599 strbuf_addf(&path, "%s/", opts->state_dir);
600 prefix_len = path.len;
601 }
602
603 strbuf_setlen(&path, prefix_len);
604 strbuf_addstr(&path, filename);
605 return path.buf;
606 }
607
608 /* Initialize the rebase options from the state directory. */
609 static int read_basic_state(struct rebase_options *opts)
610 {
611 struct strbuf head_name = STRBUF_INIT;
612 struct strbuf buf = STRBUF_INIT;
613 struct object_id oid;
614
615 if (!read_oneliner(&head_name, state_dir_path("head-name", opts),
616 READ_ONELINER_WARN_MISSING) ||
617 !read_oneliner(&buf, state_dir_path("onto", opts),
618 READ_ONELINER_WARN_MISSING))
619 return -1;
620 opts->head_name = starts_with(head_name.buf, "refs/") ?
621 xstrdup(head_name.buf) : NULL;
622 strbuf_release(&head_name);
623 if (get_oid(buf.buf, &oid))
624 return error(_("could not get 'onto': '%s'"), buf.buf);
625 opts->onto = lookup_commit_or_die(&oid, buf.buf);
626
627 /*
628 * We always write to orig-head, but interactive rebase used to write to
629 * head. Fall back to reading from head to cover for the case that the
630 * user upgraded git with an ongoing interactive rebase.
631 */
632 strbuf_reset(&buf);
633 if (file_exists(state_dir_path("orig-head", opts))) {
634 if (!read_oneliner(&buf, state_dir_path("orig-head", opts),
635 READ_ONELINER_WARN_MISSING))
636 return -1;
637 } else if (!read_oneliner(&buf, state_dir_path("head", opts),
638 READ_ONELINER_WARN_MISSING))
639 return -1;
640 if (get_oid(buf.buf, &opts->orig_head))
641 return error(_("invalid orig-head: '%s'"), buf.buf);
642
643 if (file_exists(state_dir_path("quiet", opts)))
644 opts->flags &= ~REBASE_NO_QUIET;
645 else
646 opts->flags |= REBASE_NO_QUIET;
647
648 if (file_exists(state_dir_path("verbose", opts)))
649 opts->flags |= REBASE_VERBOSE;
650
651 if (file_exists(state_dir_path("signoff", opts))) {
652 opts->signoff = 1;
653 opts->flags |= REBASE_FORCE;
654 }
655
656 if (file_exists(state_dir_path("allow_rerere_autoupdate", opts))) {
657 strbuf_reset(&buf);
658 if (!read_oneliner(&buf, state_dir_path("allow_rerere_autoupdate", opts),
659 READ_ONELINER_WARN_MISSING))
660 return -1;
661 if (!strcmp(buf.buf, "--rerere-autoupdate"))
662 opts->allow_rerere_autoupdate = RERERE_AUTOUPDATE;
663 else if (!strcmp(buf.buf, "--no-rerere-autoupdate"))
664 opts->allow_rerere_autoupdate = RERERE_NOAUTOUPDATE;
665 else
666 warning(_("ignoring invalid allow_rerere_autoupdate: "
667 "'%s'"), buf.buf);
668 }
669
670 if (file_exists(state_dir_path("gpg_sign_opt", opts))) {
671 strbuf_reset(&buf);
672 if (!read_oneliner(&buf, state_dir_path("gpg_sign_opt", opts),
673 READ_ONELINER_WARN_MISSING))
674 return -1;
675 free(opts->gpg_sign_opt);
676 opts->gpg_sign_opt = xstrdup(buf.buf);
677 }
678
679 if (file_exists(state_dir_path("strategy", opts))) {
680 strbuf_reset(&buf);
681 if (!read_oneliner(&buf, state_dir_path("strategy", opts),
682 READ_ONELINER_WARN_MISSING))
683 return -1;
684 free(opts->strategy);
685 opts->strategy = xstrdup(buf.buf);
686 }
687
688 if (file_exists(state_dir_path("strategy_opts", opts))) {
689 strbuf_reset(&buf);
690 if (!read_oneliner(&buf, state_dir_path("strategy_opts", opts),
691 READ_ONELINER_WARN_MISSING))
692 return -1;
693 free(opts->strategy_opts);
694 opts->strategy_opts = xstrdup(buf.buf);
695 }
696
697 strbuf_release(&buf);
698
699 return 0;
700 }
701
702 static int rebase_write_basic_state(struct rebase_options *opts)
703 {
704 write_file(state_dir_path("head-name", opts), "%s",
705 opts->head_name ? opts->head_name : "detached HEAD");
706 write_file(state_dir_path("onto", opts), "%s",
707 opts->onto ? oid_to_hex(&opts->onto->object.oid) : "");
708 write_file(state_dir_path("orig-head", opts), "%s",
709 oid_to_hex(&opts->orig_head));
710 if (!(opts->flags & REBASE_NO_QUIET))
711 write_file(state_dir_path("quiet", opts), "%s", "");
712 if (opts->flags & REBASE_VERBOSE)
713 write_file(state_dir_path("verbose", opts), "%s", "");
714 if (opts->strategy)
715 write_file(state_dir_path("strategy", opts), "%s",
716 opts->strategy);
717 if (opts->strategy_opts)
718 write_file(state_dir_path("strategy_opts", opts), "%s",
719 opts->strategy_opts);
720 if (opts->allow_rerere_autoupdate > 0)
721 write_file(state_dir_path("allow_rerere_autoupdate", opts),
722 "-%s-rerere-autoupdate",
723 opts->allow_rerere_autoupdate == RERERE_AUTOUPDATE ?
724 "" : "-no");
725 if (opts->gpg_sign_opt)
726 write_file(state_dir_path("gpg_sign_opt", opts), "%s",
727 opts->gpg_sign_opt);
728 if (opts->signoff)
729 write_file(state_dir_path("signoff", opts), "--signoff");
730
731 return 0;
732 }
733
734 static int finish_rebase(struct rebase_options *opts)
735 {
736 struct strbuf dir = STRBUF_INIT;
737 int ret = 0;
738
739 delete_ref(NULL, "REBASE_HEAD", NULL, REF_NO_DEREF);
740 apply_autostash(state_dir_path("autostash", opts));
741 close_object_store(the_repository->objects);
742 /*
743 * We ignore errors in 'git maintenance run --auto', since the
744 * user should see them.
745 */
746 run_auto_maintenance(!(opts->flags & (REBASE_NO_QUIET|REBASE_VERBOSE)));
747 if (opts->type == REBASE_MERGE) {
748 struct replay_opts replay = REPLAY_OPTS_INIT;
749
750 replay.action = REPLAY_INTERACTIVE_REBASE;
751 ret = sequencer_remove_state(&replay);
752 } else {
753 strbuf_addstr(&dir, opts->state_dir);
754 if (remove_dir_recursively(&dir, 0))
755 ret = error(_("could not remove '%s'"),
756 opts->state_dir);
757 strbuf_release(&dir);
758 }
759
760 return ret;
761 }
762
763 static struct commit *peel_committish(const char *name)
764 {
765 struct object *obj;
766 struct object_id oid;
767
768 if (get_oid(name, &oid))
769 return NULL;
770 obj = parse_object(the_repository, &oid);
771 return (struct commit *)peel_to_type(name, 0, obj, OBJ_COMMIT);
772 }
773
774 static void add_var(struct strbuf *buf, const char *name, const char *value)
775 {
776 if (!value)
777 strbuf_addf(buf, "unset %s; ", name);
778 else {
779 strbuf_addf(buf, "%s=", name);
780 sq_quote_buf(buf, value);
781 strbuf_addstr(buf, "; ");
782 }
783 }
784
785 static int move_to_original_branch(struct rebase_options *opts)
786 {
787 struct strbuf orig_head_reflog = STRBUF_INIT, head_reflog = STRBUF_INIT;
788 int ret;
789
790 if (!opts->head_name)
791 return 0; /* nothing to move back to */
792
793 if (!opts->onto)
794 BUG("move_to_original_branch without onto");
795
796 strbuf_addf(&orig_head_reflog, "rebase finished: %s onto %s",
797 opts->head_name, oid_to_hex(&opts->onto->object.oid));
798 strbuf_addf(&head_reflog, "rebase finished: returning to %s",
799 opts->head_name);
800 ret = reset_head(the_repository, NULL, "", opts->head_name,
801 RESET_HEAD_REFS_ONLY,
802 orig_head_reflog.buf, head_reflog.buf,
803 DEFAULT_REFLOG_ACTION);
804
805 strbuf_release(&orig_head_reflog);
806 strbuf_release(&head_reflog);
807 return ret;
808 }
809
810 static const char *resolvemsg =
811 N_("Resolve all conflicts manually, mark them as resolved with\n"
812 "\"git add/rm <conflicted_files>\", then run \"git rebase --continue\".\n"
813 "You can instead skip this commit: run \"git rebase --skip\".\n"
814 "To abort and get back to the state before \"git rebase\", run "
815 "\"git rebase --abort\".");
816
817 static int run_am(struct rebase_options *opts)
818 {
819 struct child_process am = CHILD_PROCESS_INIT;
820 struct child_process format_patch = CHILD_PROCESS_INIT;
821 struct strbuf revisions = STRBUF_INIT;
822 int status;
823 char *rebased_patches;
824
825 am.git_cmd = 1;
826 strvec_push(&am.args, "am");
827
828 if (opts->action && !strcmp("continue", opts->action)) {
829 strvec_push(&am.args, "--resolved");
830 strvec_pushf(&am.args, "--resolvemsg=%s", resolvemsg);
831 if (opts->gpg_sign_opt)
832 strvec_push(&am.args, opts->gpg_sign_opt);
833 status = run_command(&am);
834 if (status)
835 return status;
836
837 return move_to_original_branch(opts);
838 }
839 if (opts->action && !strcmp("skip", opts->action)) {
840 strvec_push(&am.args, "--skip");
841 strvec_pushf(&am.args, "--resolvemsg=%s", resolvemsg);
842 status = run_command(&am);
843 if (status)
844 return status;
845
846 return move_to_original_branch(opts);
847 }
848 if (opts->action && !strcmp("show-current-patch", opts->action)) {
849 strvec_push(&am.args, "--show-current-patch");
850 return run_command(&am);
851 }
852
853 strbuf_addf(&revisions, "%s...%s",
854 oid_to_hex(opts->root ?
855 /* this is now equivalent to !opts->upstream */
856 &opts->onto->object.oid :
857 &opts->upstream->object.oid),
858 oid_to_hex(&opts->orig_head));
859
860 rebased_patches = xstrdup(git_path("rebased-patches"));
861 format_patch.out = open(rebased_patches,
862 O_WRONLY | O_CREAT | O_TRUNC, 0666);
863 if (format_patch.out < 0) {
864 status = error_errno(_("could not open '%s' for writing"),
865 rebased_patches);
866 free(rebased_patches);
867 strvec_clear(&am.args);
868 return status;
869 }
870
871 format_patch.git_cmd = 1;
872 strvec_pushl(&format_patch.args, "format-patch", "-k", "--stdout",
873 "--full-index", "--cherry-pick", "--right-only",
874 "--src-prefix=a/", "--dst-prefix=b/", "--no-renames",
875 "--no-cover-letter", "--pretty=mboxrd", "--topo-order",
876 "--no-base", NULL);
877 if (opts->git_format_patch_opt.len)
878 strvec_split(&format_patch.args,
879 opts->git_format_patch_opt.buf);
880 strvec_push(&format_patch.args, revisions.buf);
881 if (opts->restrict_revision)
882 strvec_pushf(&format_patch.args, "^%s",
883 oid_to_hex(&opts->restrict_revision->object.oid));
884
885 status = run_command(&format_patch);
886 if (status) {
887 unlink(rebased_patches);
888 free(rebased_patches);
889 strvec_clear(&am.args);
890
891 reset_head(the_repository, &opts->orig_head, "checkout",
892 opts->head_name, 0,
893 "HEAD", NULL, DEFAULT_REFLOG_ACTION);
894 error(_("\ngit encountered an error while preparing the "
895 "patches to replay\n"
896 "these revisions:\n"
897 "\n %s\n\n"
898 "As a result, git cannot rebase them."),
899 opts->revisions);
900
901 strbuf_release(&revisions);
902 return status;
903 }
904 strbuf_release(&revisions);
905
906 am.in = open(rebased_patches, O_RDONLY);
907 if (am.in < 0) {
908 status = error_errno(_("could not open '%s' for reading"),
909 rebased_patches);
910 free(rebased_patches);
911 strvec_clear(&am.args);
912 return status;
913 }
914
915 strvec_pushv(&am.args, opts->git_am_opts.v);
916 strvec_push(&am.args, "--rebasing");
917 strvec_pushf(&am.args, "--resolvemsg=%s", resolvemsg);
918 strvec_push(&am.args, "--patch-format=mboxrd");
919 if (opts->allow_rerere_autoupdate == RERERE_AUTOUPDATE)
920 strvec_push(&am.args, "--rerere-autoupdate");
921 else if (opts->allow_rerere_autoupdate == RERERE_NOAUTOUPDATE)
922 strvec_push(&am.args, "--no-rerere-autoupdate");
923 if (opts->gpg_sign_opt)
924 strvec_push(&am.args, opts->gpg_sign_opt);
925 status = run_command(&am);
926 unlink(rebased_patches);
927 free(rebased_patches);
928
929 if (!status) {
930 return move_to_original_branch(opts);
931 }
932
933 if (is_directory(opts->state_dir))
934 rebase_write_basic_state(opts);
935
936 return status;
937 }
938
939 static int run_specific_rebase(struct rebase_options *opts, enum action action)
940 {
941 const char *argv[] = { NULL, NULL };
942 struct strbuf script_snippet = STRBUF_INIT, buf = STRBUF_INIT;
943 int status;
944 const char *backend, *backend_func;
945
946 if (opts->type == REBASE_MERGE) {
947 /* Run sequencer-based rebase */
948 setenv("GIT_CHERRY_PICK_HELP", resolvemsg, 1);
949 if (!(opts->flags & REBASE_INTERACTIVE_EXPLICIT)) {
950 setenv("GIT_SEQUENCE_EDITOR", ":", 1);
951 opts->autosquash = 0;
952 }
953 if (opts->gpg_sign_opt) {
954 /* remove the leading "-S" */
955 char *tmp = xstrdup(opts->gpg_sign_opt + 2);
956 free(opts->gpg_sign_opt);
957 opts->gpg_sign_opt = tmp;
958 }
959
960 status = run_sequencer_rebase(opts, action);
961 goto finished_rebase;
962 }
963
964 if (opts->type == REBASE_APPLY) {
965 status = run_am(opts);
966 goto finished_rebase;
967 }
968
969 add_var(&script_snippet, "GIT_DIR", absolute_path(get_git_dir()));
970 add_var(&script_snippet, "state_dir", opts->state_dir);
971
972 add_var(&script_snippet, "upstream_name", opts->upstream_name);
973 add_var(&script_snippet, "upstream", opts->upstream ?
974 oid_to_hex(&opts->upstream->object.oid) : NULL);
975 add_var(&script_snippet, "head_name",
976 opts->head_name ? opts->head_name : "detached HEAD");
977 add_var(&script_snippet, "orig_head", oid_to_hex(&opts->orig_head));
978 add_var(&script_snippet, "onto", opts->onto ?
979 oid_to_hex(&opts->onto->object.oid) : NULL);
980 add_var(&script_snippet, "onto_name", opts->onto_name);
981 add_var(&script_snippet, "revisions", opts->revisions);
982 add_var(&script_snippet, "restrict_revision", opts->restrict_revision ?
983 oid_to_hex(&opts->restrict_revision->object.oid) : NULL);
984 sq_quote_argv_pretty(&buf, opts->git_am_opts.v);
985 add_var(&script_snippet, "git_am_opt", buf.buf);
986 strbuf_release(&buf);
987 add_var(&script_snippet, "verbose",
988 opts->flags & REBASE_VERBOSE ? "t" : "");
989 add_var(&script_snippet, "diffstat",
990 opts->flags & REBASE_DIFFSTAT ? "t" : "");
991 add_var(&script_snippet, "force_rebase",
992 opts->flags & REBASE_FORCE ? "t" : "");
993 if (opts->switch_to)
994 add_var(&script_snippet, "switch_to", opts->switch_to);
995 add_var(&script_snippet, "action", opts->action ? opts->action : "");
996 add_var(&script_snippet, "signoff", opts->signoff ? "--signoff" : "");
997 add_var(&script_snippet, "allow_rerere_autoupdate",
998 opts->allow_rerere_autoupdate ?
999 opts->allow_rerere_autoupdate == RERERE_AUTOUPDATE ?
1000 "--rerere-autoupdate" : "--no-rerere-autoupdate" : "");
1001 add_var(&script_snippet, "keep_empty", opts->keep_empty ? "yes" : "");
1002 add_var(&script_snippet, "autosquash", opts->autosquash ? "t" : "");
1003 add_var(&script_snippet, "gpg_sign_opt", opts->gpg_sign_opt);
1004 add_var(&script_snippet, "cmd", opts->cmd);
1005 add_var(&script_snippet, "allow_empty_message",
1006 opts->allow_empty_message ? "--allow-empty-message" : "");
1007 add_var(&script_snippet, "rebase_merges",
1008 opts->rebase_merges ? "t" : "");
1009 add_var(&script_snippet, "rebase_cousins",
1010 opts->rebase_cousins ? "t" : "");
1011 add_var(&script_snippet, "strategy", opts->strategy);
1012 add_var(&script_snippet, "strategy_opts", opts->strategy_opts);
1013 add_var(&script_snippet, "rebase_root", opts->root ? "t" : "");
1014 add_var(&script_snippet, "squash_onto",
1015 opts->squash_onto ? oid_to_hex(opts->squash_onto) : "");
1016 add_var(&script_snippet, "git_format_patch_opt",
1017 opts->git_format_patch_opt.buf);
1018
1019 if (is_merge(opts) &&
1020 !(opts->flags & REBASE_INTERACTIVE_EXPLICIT)) {
1021 strbuf_addstr(&script_snippet,
1022 "GIT_SEQUENCE_EDITOR=:; export GIT_SEQUENCE_EDITOR; ");
1023 opts->autosquash = 0;
1024 }
1025
1026 switch (opts->type) {
1027 case REBASE_PRESERVE_MERGES:
1028 backend = "git-rebase--preserve-merges";
1029 backend_func = "git_rebase__preserve_merges";
1030 break;
1031 default:
1032 BUG("Unhandled rebase type %d", opts->type);
1033 break;
1034 }
1035
1036 strbuf_addf(&script_snippet,
1037 ". git-sh-setup && . %s && %s", backend, backend_func);
1038 argv[0] = script_snippet.buf;
1039
1040 status = run_command_v_opt(argv, RUN_USING_SHELL);
1041 finished_rebase:
1042 if (opts->dont_finish_rebase)
1043 ; /* do nothing */
1044 else if (opts->type == REBASE_MERGE)
1045 ; /* merge backend cleans up after itself */
1046 else if (status == 0) {
1047 if (!file_exists(state_dir_path("stopped-sha", opts)))
1048 finish_rebase(opts);
1049 } else if (status == 2) {
1050 struct strbuf dir = STRBUF_INIT;
1051
1052 apply_autostash(state_dir_path("autostash", opts));
1053 strbuf_addstr(&dir, opts->state_dir);
1054 remove_dir_recursively(&dir, 0);
1055 strbuf_release(&dir);
1056 die("Nothing to do");
1057 }
1058
1059 strbuf_release(&script_snippet);
1060
1061 return status ? -1 : 0;
1062 }
1063
1064 static int rebase_config(const char *var, const char *value, void *data)
1065 {
1066 struct rebase_options *opts = data;
1067
1068 if (!strcmp(var, "rebase.stat")) {
1069 if (git_config_bool(var, value))
1070 opts->flags |= REBASE_DIFFSTAT;
1071 else
1072 opts->flags &= ~REBASE_DIFFSTAT;
1073 return 0;
1074 }
1075
1076 if (!strcmp(var, "rebase.autosquash")) {
1077 opts->autosquash = git_config_bool(var, value);
1078 return 0;
1079 }
1080
1081 if (!strcmp(var, "commit.gpgsign")) {
1082 free(opts->gpg_sign_opt);
1083 opts->gpg_sign_opt = git_config_bool(var, value) ?
1084 xstrdup("-S") : NULL;
1085 return 0;
1086 }
1087
1088 if (!strcmp(var, "rebase.autostash")) {
1089 opts->autostash = git_config_bool(var, value);
1090 return 0;
1091 }
1092
1093 if (!strcmp(var, "rebase.reschedulefailedexec")) {
1094 opts->reschedule_failed_exec = git_config_bool(var, value);
1095 return 0;
1096 }
1097
1098 if (!strcmp(var, "rebase.usebuiltin")) {
1099 opts->use_legacy_rebase = !git_config_bool(var, value);
1100 return 0;
1101 }
1102
1103 if (!strcmp(var, "rebase.backend")) {
1104 return git_config_string(&opts->default_backend, var, value);
1105 }
1106
1107 return git_default_config(var, value, data);
1108 }
1109
1110 /*
1111 * Determines whether the commits in from..to are linear, i.e. contain
1112 * no merge commits. This function *expects* `from` to be an ancestor of
1113 * `to`.
1114 */
1115 static int is_linear_history(struct commit *from, struct commit *to)
1116 {
1117 while (to && to != from) {
1118 parse_commit(to);
1119 if (!to->parents)
1120 return 1;
1121 if (to->parents->next)
1122 return 0;
1123 to = to->parents->item;
1124 }
1125 return 1;
1126 }
1127
1128 static int can_fast_forward(struct commit *onto, struct commit *upstream,
1129 struct commit *restrict_revision,
1130 struct object_id *head_oid, struct object_id *merge_base)
1131 {
1132 struct commit *head = lookup_commit(the_repository, head_oid);
1133 struct commit_list *merge_bases = NULL;
1134 int res = 0;
1135
1136 if (!head)
1137 goto done;
1138
1139 merge_bases = get_merge_bases(onto, head);
1140 if (!merge_bases || merge_bases->next) {
1141 oidcpy(merge_base, &null_oid);
1142 goto done;
1143 }
1144
1145 oidcpy(merge_base, &merge_bases->item->object.oid);
1146 if (!oideq(merge_base, &onto->object.oid))
1147 goto done;
1148
1149 if (restrict_revision && !oideq(&restrict_revision->object.oid, merge_base))
1150 goto done;
1151
1152 if (!upstream)
1153 goto done;
1154
1155 free_commit_list(merge_bases);
1156 merge_bases = get_merge_bases(upstream, head);
1157 if (!merge_bases || merge_bases->next)
1158 goto done;
1159
1160 if (!oideq(&onto->object.oid, &merge_bases->item->object.oid))
1161 goto done;
1162
1163 res = 1;
1164
1165 done:
1166 free_commit_list(merge_bases);
1167 return res && is_linear_history(onto, head);
1168 }
1169
1170 static int parse_opt_am(const struct option *opt, const char *arg, int unset)
1171 {
1172 struct rebase_options *opts = opt->value;
1173
1174 BUG_ON_OPT_NEG(unset);
1175 BUG_ON_OPT_ARG(arg);
1176
1177 opts->type = REBASE_APPLY;
1178
1179 return 0;
1180 }
1181
1182 /* -i followed by -m is still -i */
1183 static int parse_opt_merge(const struct option *opt, const char *arg, int unset)
1184 {
1185 struct rebase_options *opts = opt->value;
1186
1187 BUG_ON_OPT_NEG(unset);
1188 BUG_ON_OPT_ARG(arg);
1189
1190 if (!is_merge(opts))
1191 opts->type = REBASE_MERGE;
1192
1193 return 0;
1194 }
1195
1196 /* -i followed by -p is still explicitly interactive, but -p alone is not */
1197 static int parse_opt_interactive(const struct option *opt, const char *arg,
1198 int unset)
1199 {
1200 struct rebase_options *opts = opt->value;
1201
1202 BUG_ON_OPT_NEG(unset);
1203 BUG_ON_OPT_ARG(arg);
1204
1205 opts->type = REBASE_MERGE;
1206 opts->flags |= REBASE_INTERACTIVE_EXPLICIT;
1207
1208 return 0;
1209 }
1210
1211 static enum empty_type parse_empty_value(const char *value)
1212 {
1213 if (!strcasecmp(value, "drop"))
1214 return EMPTY_DROP;
1215 else if (!strcasecmp(value, "keep"))
1216 return EMPTY_KEEP;
1217 else if (!strcasecmp(value, "ask"))
1218 return EMPTY_ASK;
1219
1220 die(_("unrecognized empty type '%s'; valid values are \"drop\", \"keep\", and \"ask\"."), value);
1221 }
1222
1223 static int parse_opt_empty(const struct option *opt, const char *arg, int unset)
1224 {
1225 struct rebase_options *options = opt->value;
1226 enum empty_type value = parse_empty_value(arg);
1227
1228 BUG_ON_OPT_NEG(unset);
1229
1230 options->empty = value;
1231 return 0;
1232 }
1233
1234 static void NORETURN error_on_missing_default_upstream(void)
1235 {
1236 struct branch *current_branch = branch_get(NULL);
1237
1238 printf(_("%s\n"
1239 "Please specify which branch you want to rebase against.\n"
1240 "See git-rebase(1) for details.\n"
1241 "\n"
1242 " git rebase '<branch>'\n"
1243 "\n"),
1244 current_branch ? _("There is no tracking information for "
1245 "the current branch.") :
1246 _("You are not currently on a branch."));
1247
1248 if (current_branch) {
1249 const char *remote = current_branch->remote_name;
1250
1251 if (!remote)
1252 remote = _("<remote>");
1253
1254 printf(_("If you wish to set tracking information for this "
1255 "branch you can do so with:\n"
1256 "\n"
1257 " git branch --set-upstream-to=%s/<branch> %s\n"
1258 "\n"),
1259 remote, current_branch->name);
1260 }
1261 exit(1);
1262 }
1263
1264 static void set_reflog_action(struct rebase_options *options)
1265 {
1266 const char *env;
1267 struct strbuf buf = STRBUF_INIT;
1268
1269 if (!is_merge(options))
1270 return;
1271
1272 env = getenv(GIT_REFLOG_ACTION_ENVIRONMENT);
1273 if (env && strcmp("rebase", env))
1274 return; /* only override it if it is "rebase" */
1275
1276 strbuf_addf(&buf, "rebase (%s)", options->action);
1277 setenv(GIT_REFLOG_ACTION_ENVIRONMENT, buf.buf, 1);
1278 strbuf_release(&buf);
1279 }
1280
1281 static int check_exec_cmd(const char *cmd)
1282 {
1283 if (strchr(cmd, '\n'))
1284 return error(_("exec commands cannot contain newlines"));
1285
1286 /* Does the command consist purely of whitespace? */
1287 if (!cmd[strspn(cmd, " \t\r\f\v")])
1288 return error(_("empty exec command"));
1289
1290 return 0;
1291 }
1292
1293 int cmd_rebase(int argc, const char **argv, const char *prefix)
1294 {
1295 struct rebase_options options = REBASE_OPTIONS_INIT;
1296 const char *branch_name;
1297 int ret, flags, total_argc, in_progress = 0;
1298 int keep_base = 0;
1299 int ok_to_skip_pre_rebase = 0;
1300 struct strbuf msg = STRBUF_INIT;
1301 struct strbuf revisions = STRBUF_INIT;
1302 struct strbuf buf = STRBUF_INIT;
1303 struct object_id merge_base;
1304 int ignore_whitespace = 0;
1305 enum action action = ACTION_NONE;
1306 const char *gpg_sign = NULL;
1307 struct string_list exec = STRING_LIST_INIT_NODUP;
1308 const char *rebase_merges = NULL;
1309 int fork_point = -1;
1310 struct string_list strategy_options = STRING_LIST_INIT_NODUP;
1311 struct object_id squash_onto;
1312 char *squash_onto_name = NULL;
1313 int reschedule_failed_exec = -1;
1314 int allow_preemptive_ff = 1;
1315 struct option builtin_rebase_options[] = {
1316 OPT_STRING(0, "onto", &options.onto_name,
1317 N_("revision"),
1318 N_("rebase onto given branch instead of upstream")),
1319 OPT_BOOL(0, "keep-base", &keep_base,
1320 N_("use the merge-base of upstream and branch as the current base")),
1321 OPT_BOOL(0, "no-verify", &ok_to_skip_pre_rebase,
1322 N_("allow pre-rebase hook to run")),
1323 OPT_NEGBIT('q', "quiet", &options.flags,
1324 N_("be quiet. implies --no-stat"),
1325 REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT),
1326 OPT_BIT('v', "verbose", &options.flags,
1327 N_("display a diffstat of what changed upstream"),
1328 REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT),
1329 {OPTION_NEGBIT, 'n', "no-stat", &options.flags, NULL,
1330 N_("do not show diffstat of what changed upstream"),
1331 PARSE_OPT_NOARG, NULL, REBASE_DIFFSTAT },
1332 OPT_BOOL(0, "signoff", &options.signoff,
1333 N_("add a Signed-off-by trailer to each commit")),
1334 OPT_BOOL(0, "committer-date-is-author-date",
1335 &options.committer_date_is_author_date,
1336 N_("make committer date match author date")),
1337 OPT_BOOL(0, "reset-author-date", &options.ignore_date,
1338 N_("ignore author date and use current date")),
1339 OPT_HIDDEN_BOOL(0, "ignore-date", &options.ignore_date,
1340 N_("synonym of --reset-author-date")),
1341 OPT_PASSTHRU_ARGV('C', NULL, &options.git_am_opts, N_("n"),
1342 N_("passed to 'git apply'"), 0),
1343 OPT_BOOL(0, "ignore-whitespace", &ignore_whitespace,
1344 N_("ignore changes in whitespace")),
1345 OPT_PASSTHRU_ARGV(0, "whitespace", &options.git_am_opts,
1346 N_("action"), N_("passed to 'git apply'"), 0),
1347 OPT_BIT('f', "force-rebase", &options.flags,
1348 N_("cherry-pick all commits, even if unchanged"),
1349 REBASE_FORCE),
1350 OPT_BIT(0, "no-ff", &options.flags,
1351 N_("cherry-pick all commits, even if unchanged"),
1352 REBASE_FORCE),
1353 OPT_CMDMODE(0, "continue", &action, N_("continue"),
1354 ACTION_CONTINUE),
1355 OPT_CMDMODE(0, "skip", &action,
1356 N_("skip current patch and continue"), ACTION_SKIP),
1357 OPT_CMDMODE(0, "abort", &action,
1358 N_("abort and check out the original branch"),
1359 ACTION_ABORT),
1360 OPT_CMDMODE(0, "quit", &action,
1361 N_("abort but keep HEAD where it is"), ACTION_QUIT),
1362 OPT_CMDMODE(0, "edit-todo", &action, N_("edit the todo list "
1363 "during an interactive rebase"), ACTION_EDIT_TODO),
1364 OPT_CMDMODE(0, "show-current-patch", &action,
1365 N_("show the patch file being applied or merged"),
1366 ACTION_SHOW_CURRENT_PATCH),
1367 OPT_CALLBACK_F(0, "apply", &options, NULL,
1368 N_("use apply strategies to rebase"),
1369 PARSE_OPT_NOARG | PARSE_OPT_NONEG,
1370 parse_opt_am),
1371 OPT_CALLBACK_F('m', "merge", &options, NULL,
1372 N_("use merging strategies to rebase"),
1373 PARSE_OPT_NOARG | PARSE_OPT_NONEG,
1374 parse_opt_merge),
1375 OPT_CALLBACK_F('i', "interactive", &options, NULL,
1376 N_("let the user edit the list of commits to rebase"),
1377 PARSE_OPT_NOARG | PARSE_OPT_NONEG,
1378 parse_opt_interactive),
1379 OPT_SET_INT_F('p', "preserve-merges", &options.type,
1380 N_("(DEPRECATED) try to recreate merges instead of "
1381 "ignoring them"),
1382 REBASE_PRESERVE_MERGES, PARSE_OPT_HIDDEN),
1383 OPT_RERERE_AUTOUPDATE(&options.allow_rerere_autoupdate),
1384 OPT_CALLBACK_F(0, "empty", &options, "{drop,keep,ask}",
1385 N_("how to handle commits that become empty"),
1386 PARSE_OPT_NONEG, parse_opt_empty),
1387 OPT_CALLBACK_F('k', "keep-empty", &options, NULL,
1388 N_("keep commits which start empty"),
1389 PARSE_OPT_NOARG | PARSE_OPT_HIDDEN,
1390 parse_opt_keep_empty),
1391 OPT_BOOL(0, "autosquash", &options.autosquash,
1392 N_("move commits that begin with "
1393 "squash!/fixup! under -i")),
1394 { OPTION_STRING, 'S', "gpg-sign", &gpg_sign, N_("key-id"),
1395 N_("GPG-sign commits"),
1396 PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
1397 OPT_AUTOSTASH(&options.autostash),
1398 OPT_STRING_LIST('x', "exec", &exec, N_("exec"),
1399 N_("add exec lines after each commit of the "
1400 "editable list")),
1401 OPT_BOOL_F(0, "allow-empty-message",
1402 &options.allow_empty_message,
1403 N_("allow rebasing commits with empty messages"),
1404 PARSE_OPT_HIDDEN),
1405 {OPTION_STRING, 'r', "rebase-merges", &rebase_merges,
1406 N_("mode"),
1407 N_("try to rebase merges instead of skipping them"),
1408 PARSE_OPT_OPTARG, NULL, (intptr_t)""},
1409 OPT_BOOL(0, "fork-point", &fork_point,
1410 N_("use 'merge-base --fork-point' to refine upstream")),
1411 OPT_STRING('s', "strategy", &options.strategy,
1412 N_("strategy"), N_("use the given merge strategy")),
1413 OPT_STRING_LIST('X', "strategy-option", &strategy_options,
1414 N_("option"),
1415 N_("pass the argument through to the merge "
1416 "strategy")),
1417 OPT_BOOL(0, "root", &options.root,
1418 N_("rebase all reachable commits up to the root(s)")),
1419 OPT_BOOL(0, "reschedule-failed-exec",
1420 &reschedule_failed_exec,
1421 N_("automatically re-schedule any `exec` that fails")),
1422 OPT_BOOL(0, "reapply-cherry-picks", &options.reapply_cherry_picks,
1423 N_("apply all changes, even those already present upstream")),
1424 OPT_END(),
1425 };
1426 int i;
1427
1428 if (argc == 2 && !strcmp(argv[1], "-h"))
1429 usage_with_options(builtin_rebase_usage,
1430 builtin_rebase_options);
1431
1432 options.allow_empty_message = 1;
1433 git_config(rebase_config, &options);
1434 /* options.gpg_sign_opt will be either "-S" or NULL */
1435 gpg_sign = options.gpg_sign_opt ? "" : NULL;
1436 FREE_AND_NULL(options.gpg_sign_opt);
1437
1438 if (options.use_legacy_rebase ||
1439 !git_env_bool("GIT_TEST_REBASE_USE_BUILTIN", -1))
1440 warning(_("the rebase.useBuiltin support has been removed!\n"
1441 "See its entry in 'git help config' for details."));
1442
1443 strbuf_reset(&buf);
1444 strbuf_addf(&buf, "%s/applying", apply_dir());
1445 if(file_exists(buf.buf))
1446 die(_("It looks like 'git am' is in progress. Cannot rebase."));
1447
1448 if (is_directory(apply_dir())) {
1449 options.type = REBASE_APPLY;
1450 options.state_dir = apply_dir();
1451 } else if (is_directory(merge_dir())) {
1452 strbuf_reset(&buf);
1453 strbuf_addf(&buf, "%s/rewritten", merge_dir());
1454 if (is_directory(buf.buf)) {
1455 options.type = REBASE_PRESERVE_MERGES;
1456 options.flags |= REBASE_INTERACTIVE_EXPLICIT;
1457 } else {
1458 strbuf_reset(&buf);
1459 strbuf_addf(&buf, "%s/interactive", merge_dir());
1460 if(file_exists(buf.buf)) {
1461 options.type = REBASE_MERGE;
1462 options.flags |= REBASE_INTERACTIVE_EXPLICIT;
1463 } else
1464 options.type = REBASE_MERGE;
1465 }
1466 options.state_dir = merge_dir();
1467 }
1468
1469 if (options.type != REBASE_UNSPECIFIED)
1470 in_progress = 1;
1471
1472 total_argc = argc;
1473 argc = parse_options(argc, argv, prefix,
1474 builtin_rebase_options,
1475 builtin_rebase_usage, 0);
1476
1477 if (action != ACTION_NONE && total_argc != 2) {
1478 usage_with_options(builtin_rebase_usage,
1479 builtin_rebase_options);
1480 }
1481
1482 if (argc > 2)
1483 usage_with_options(builtin_rebase_usage,
1484 builtin_rebase_options);
1485
1486 if (options.type == REBASE_PRESERVE_MERGES)
1487 warning(_("git rebase --preserve-merges is deprecated. "
1488 "Use --rebase-merges instead."));
1489
1490 if (keep_base) {
1491 if (options.onto_name)
1492 die(_("cannot combine '--keep-base' with '--onto'"));
1493 if (options.root)
1494 die(_("cannot combine '--keep-base' with '--root'"));
1495 }
1496
1497 if (options.root && fork_point > 0)
1498 die(_("cannot combine '--root' with '--fork-point'"));
1499
1500 if (action != ACTION_NONE && !in_progress)
1501 die(_("No rebase in progress?"));
1502 setenv(GIT_REFLOG_ACTION_ENVIRONMENT, "rebase", 0);
1503
1504 if (action == ACTION_EDIT_TODO && !is_merge(&options))
1505 die(_("The --edit-todo action can only be used during "
1506 "interactive rebase."));
1507
1508 if (trace2_is_enabled()) {
1509 if (is_merge(&options))
1510 trace2_cmd_mode("interactive");
1511 else if (exec.nr)
1512 trace2_cmd_mode("interactive-exec");
1513 else
1514 trace2_cmd_mode(action_names[action]);
1515 }
1516
1517 switch (action) {
1518 case ACTION_CONTINUE: {
1519 struct object_id head;
1520 struct lock_file lock_file = LOCK_INIT;
1521 int fd;
1522
1523 options.action = "continue";
1524 set_reflog_action(&options);
1525
1526 /* Sanity check */
1527 if (get_oid("HEAD", &head))
1528 die(_("Cannot read HEAD"));
1529
1530 fd = hold_locked_index(&lock_file, 0);
1531 if (repo_read_index(the_repository) < 0)
1532 die(_("could not read index"));
1533 refresh_index(the_repository->index, REFRESH_QUIET, NULL, NULL,
1534 NULL);
1535 if (0 <= fd)
1536 repo_update_index_if_able(the_repository, &lock_file);
1537 rollback_lock_file(&lock_file);
1538
1539 if (has_unstaged_changes(the_repository, 1)) {
1540 puts(_("You must edit all merge conflicts and then\n"
1541 "mark them as resolved using git add"));
1542 exit(1);
1543 }
1544 if (read_basic_state(&options))
1545 exit(1);
1546 goto run_rebase;
1547 }
1548 case ACTION_SKIP: {
1549 struct string_list merge_rr = STRING_LIST_INIT_DUP;
1550
1551 options.action = "skip";
1552 set_reflog_action(&options);
1553
1554 rerere_clear(the_repository, &merge_rr);
1555 string_list_clear(&merge_rr, 1);
1556
1557 if (reset_head(the_repository, NULL, "reset", NULL, RESET_HEAD_HARD,
1558 NULL, NULL, DEFAULT_REFLOG_ACTION) < 0)
1559 die(_("could not discard worktree changes"));
1560 remove_branch_state(the_repository, 0);
1561 if (read_basic_state(&options))
1562 exit(1);
1563 goto run_rebase;
1564 }
1565 case ACTION_ABORT: {
1566 struct string_list merge_rr = STRING_LIST_INIT_DUP;
1567 options.action = "abort";
1568 set_reflog_action(&options);
1569
1570 rerere_clear(the_repository, &merge_rr);
1571 string_list_clear(&merge_rr, 1);
1572
1573 if (read_basic_state(&options))
1574 exit(1);
1575 if (reset_head(the_repository, &options.orig_head, "reset",
1576 options.head_name, RESET_HEAD_HARD,
1577 NULL, NULL, DEFAULT_REFLOG_ACTION) < 0)
1578 die(_("could not move back to %s"),
1579 oid_to_hex(&options.orig_head));
1580 remove_branch_state(the_repository, 0);
1581 ret = !!finish_rebase(&options);
1582 goto cleanup;
1583 }
1584 case ACTION_QUIT: {
1585 save_autostash(state_dir_path("autostash", &options));
1586 if (options.type == REBASE_MERGE) {
1587 struct replay_opts replay = REPLAY_OPTS_INIT;
1588
1589 replay.action = REPLAY_INTERACTIVE_REBASE;
1590 ret = !!sequencer_remove_state(&replay);
1591 } else {
1592 strbuf_reset(&buf);
1593 strbuf_addstr(&buf, options.state_dir);
1594 ret = !!remove_dir_recursively(&buf, 0);
1595 if (ret)
1596 error(_("could not remove '%s'"),
1597 options.state_dir);
1598 }
1599 goto cleanup;
1600 }
1601 case ACTION_EDIT_TODO:
1602 options.action = "edit-todo";
1603 options.dont_finish_rebase = 1;
1604 goto run_rebase;
1605 case ACTION_SHOW_CURRENT_PATCH:
1606 options.action = "show-current-patch";
1607 options.dont_finish_rebase = 1;
1608 goto run_rebase;
1609 case ACTION_NONE:
1610 break;
1611 default:
1612 BUG("action: %d", action);
1613 }
1614
1615 /* Make sure no rebase is in progress */
1616 if (in_progress) {
1617 const char *last_slash = strrchr(options.state_dir, '/');
1618 const char *state_dir_base =
1619 last_slash ? last_slash + 1 : options.state_dir;
1620 const char *cmd_live_rebase =
1621 "git rebase (--continue | --abort | --skip)";
1622 strbuf_reset(&buf);
1623 strbuf_addf(&buf, "rm -fr \"%s\"", options.state_dir);
1624 die(_("It seems that there is already a %s directory, and\n"
1625 "I wonder if you are in the middle of another rebase. "
1626 "If that is the\n"
1627 "case, please try\n\t%s\n"
1628 "If that is not the case, please\n\t%s\n"
1629 "and run me again. I am stopping in case you still "
1630 "have something\n"
1631 "valuable there.\n"),
1632 state_dir_base, cmd_live_rebase, buf.buf);
1633 }
1634
1635 if ((options.flags & REBASE_INTERACTIVE_EXPLICIT) ||
1636 (action != ACTION_NONE) ||
1637 (exec.nr > 0) ||
1638 options.autosquash) {
1639 allow_preemptive_ff = 0;
1640 }
1641 if (options.committer_date_is_author_date || options.ignore_date)
1642 options.flags |= REBASE_FORCE;
1643
1644 for (i = 0; i < options.git_am_opts.nr; i++) {
1645 const char *option = options.git_am_opts.v[i], *p;
1646 if (!strcmp(option, "--whitespace=fix") ||
1647 !strcmp(option, "--whitespace=strip"))
1648 allow_preemptive_ff = 0;
1649 else if (skip_prefix(option, "-C", &p)) {
1650 while (*p)
1651 if (!isdigit(*(p++)))
1652 die(_("switch `C' expects a "
1653 "numerical value"));
1654 } else if (skip_prefix(option, "--whitespace=", &p)) {
1655 if (*p && strcmp(p, "warn") && strcmp(p, "nowarn") &&
1656 strcmp(p, "error") && strcmp(p, "error-all"))
1657 die("Invalid whitespace option: '%s'", p);
1658 }
1659 }
1660
1661 for (i = 0; i < exec.nr; i++)
1662 if (check_exec_cmd(exec.items[i].string))
1663 exit(1);
1664
1665 if (!(options.flags & REBASE_NO_QUIET))
1666 strvec_push(&options.git_am_opts, "-q");
1667
1668 if (options.empty != EMPTY_UNSPECIFIED)
1669 imply_merge(&options, "--empty");
1670
1671 if (options.reapply_cherry_picks)
1672 imply_merge(&options, "--reapply-cherry-picks");
1673
1674 if (gpg_sign)
1675 options.gpg_sign_opt = xstrfmt("-S%s", gpg_sign);
1676
1677 if (exec.nr) {
1678 int i;
1679
1680 imply_merge(&options, "--exec");
1681
1682 strbuf_reset(&buf);
1683 for (i = 0; i < exec.nr; i++)
1684 strbuf_addf(&buf, "exec %s\n", exec.items[i].string);
1685 options.cmd = xstrdup(buf.buf);
1686 }
1687
1688 if (rebase_merges) {
1689 if (!*rebase_merges)
1690 ; /* default mode; do nothing */
1691 else if (!strcmp("rebase-cousins", rebase_merges))
1692 options.rebase_cousins = 1;
1693 else if (strcmp("no-rebase-cousins", rebase_merges))
1694 die(_("Unknown mode: %s"), rebase_merges);
1695 options.rebase_merges = 1;
1696 imply_merge(&options, "--rebase-merges");
1697 }
1698
1699 if (options.type == REBASE_APPLY) {
1700 if (ignore_whitespace)
1701 strvec_push(&options.git_am_opts,
1702 "--ignore-whitespace");
1703 if (options.committer_date_is_author_date)
1704 strvec_push(&options.git_am_opts,
1705 "--committer-date-is-author-date");
1706 if (options.ignore_date)
1707 strvec_push(&options.git_am_opts, "--ignore-date");
1708 } else {
1709 /* REBASE_MERGE and PRESERVE_MERGES */
1710 if (ignore_whitespace) {
1711 string_list_append(&strategy_options,
1712 "ignore-space-change");
1713 }
1714 }
1715
1716 if (strategy_options.nr) {
1717 int i;
1718
1719 if (!options.strategy)
1720 options.strategy = "recursive";
1721
1722 strbuf_reset(&buf);
1723 for (i = 0; i < strategy_options.nr; i++)
1724 strbuf_addf(&buf, " --%s",
1725 strategy_options.items[i].string);
1726 options.strategy_opts = xstrdup(buf.buf);
1727 }
1728
1729 if (options.strategy) {
1730 options.strategy = xstrdup(options.strategy);
1731 switch (options.type) {
1732 case REBASE_APPLY:
1733 die(_("--strategy requires --merge or --interactive"));
1734 case REBASE_MERGE:
1735 case REBASE_PRESERVE_MERGES:
1736 /* compatible */
1737 break;
1738 case REBASE_UNSPECIFIED:
1739 options.type = REBASE_MERGE;
1740 break;
1741 default:
1742 BUG("unhandled rebase type (%d)", options.type);
1743 }
1744 }
1745
1746 if (options.type == REBASE_MERGE)
1747 imply_merge(&options, "--merge");
1748
1749 if (options.root && !options.onto_name)
1750 imply_merge(&options, "--root without --onto");
1751
1752 if (isatty(2) && options.flags & REBASE_NO_QUIET)
1753 strbuf_addstr(&options.git_format_patch_opt, " --progress");
1754
1755 if (options.git_am_opts.nr || options.type == REBASE_APPLY) {
1756 /* all am options except -q are compatible only with --apply */
1757 for (i = options.git_am_opts.nr - 1; i >= 0; i--)
1758 if (strcmp(options.git_am_opts.v[i], "-q"))
1759 break;
1760
1761 if (i >= 0) {
1762 if (is_merge(&options))
1763 die(_("cannot combine apply options with "
1764 "merge options"));
1765 else
1766 options.type = REBASE_APPLY;
1767 }
1768 }
1769
1770 if (options.type == REBASE_UNSPECIFIED) {
1771 if (!strcmp(options.default_backend, "merge"))
1772 imply_merge(&options, "--merge");
1773 else if (!strcmp(options.default_backend, "apply"))
1774 options.type = REBASE_APPLY;
1775 else
1776 die(_("Unknown rebase backend: %s"),
1777 options.default_backend);
1778 }
1779
1780 if (options.type == REBASE_MERGE &&
1781 !options.strategy &&
1782 getenv("GIT_TEST_MERGE_ALGORITHM"))
1783 options.strategy = xstrdup(getenv("GIT_TEST_MERGE_ALGORITHM"));
1784
1785 switch (options.type) {
1786 case REBASE_MERGE:
1787 case REBASE_PRESERVE_MERGES:
1788 options.state_dir = merge_dir();
1789 break;
1790 case REBASE_APPLY:
1791 options.state_dir = apply_dir();
1792 break;
1793 default:
1794 BUG("options.type was just set above; should be unreachable.");
1795 }
1796
1797 if (options.empty == EMPTY_UNSPECIFIED) {
1798 if (options.flags & REBASE_INTERACTIVE_EXPLICIT)
1799 options.empty = EMPTY_ASK;
1800 else if (exec.nr > 0)
1801 options.empty = EMPTY_KEEP;
1802 else
1803 options.empty = EMPTY_DROP;
1804 }
1805 if (reschedule_failed_exec > 0 && !is_merge(&options))
1806 die(_("--reschedule-failed-exec requires "
1807 "--exec or --interactive"));
1808 if (reschedule_failed_exec >= 0)
1809 options.reschedule_failed_exec = reschedule_failed_exec;
1810
1811 if (options.signoff) {
1812 if (options.type == REBASE_PRESERVE_MERGES)
1813 die("cannot combine '--signoff' with "
1814 "'--preserve-merges'");
1815 strvec_push(&options.git_am_opts, "--signoff");
1816 options.flags |= REBASE_FORCE;
1817 }
1818
1819 if (options.type == REBASE_PRESERVE_MERGES) {
1820 /*
1821 * Note: incompatibility with --signoff handled in signoff block above
1822 * Note: incompatibility with --interactive is just a strong warning;
1823 * git-rebase.txt caveats with "unless you know what you are doing"
1824 */
1825 if (options.rebase_merges)
1826 die(_("cannot combine '--preserve-merges' with "
1827 "'--rebase-merges'"));
1828
1829 if (options.reschedule_failed_exec)
1830 die(_("error: cannot combine '--preserve-merges' with "
1831 "'--reschedule-failed-exec'"));
1832 }
1833
1834 if (!options.root) {
1835 if (argc < 1) {
1836 struct branch *branch;
1837
1838 branch = branch_get(NULL);
1839 options.upstream_name = branch_get_upstream(branch,
1840 NULL);
1841 if (!options.upstream_name)
1842 error_on_missing_default_upstream();
1843 if (fork_point < 0)
1844 fork_point = 1;
1845 } else {
1846 options.upstream_name = argv[0];
1847 argc--;
1848 argv++;
1849 if (!strcmp(options.upstream_name, "-"))
1850 options.upstream_name = "@{-1}";
1851 }
1852 options.upstream = peel_committish(options.upstream_name);
1853 if (!options.upstream)
1854 die(_("invalid upstream '%s'"), options.upstream_name);
1855 options.upstream_arg = options.upstream_name;
1856 } else {
1857 if (!options.onto_name) {
1858 if (commit_tree("", 0, the_hash_algo->empty_tree, NULL,
1859 &squash_onto, NULL, NULL) < 0)
1860 die(_("Could not create new root commit"));
1861 options.squash_onto = &squash_onto;
1862 options.onto_name = squash_onto_name =
1863 xstrdup(oid_to_hex(&squash_onto));
1864 } else
1865 options.root_with_onto = 1;
1866
1867 options.upstream_name = NULL;
1868 options.upstream = NULL;
1869 if (argc > 1)
1870 usage_with_options(builtin_rebase_usage,
1871 builtin_rebase_options);
1872 options.upstream_arg = "--root";
1873 }
1874
1875 /* Make sure the branch to rebase onto is valid. */
1876 if (keep_base) {
1877 strbuf_reset(&buf);
1878 strbuf_addstr(&buf, options.upstream_name);
1879 strbuf_addstr(&buf, "...");
1880 options.onto_name = xstrdup(buf.buf);
1881 } else if (!options.onto_name)
1882 options.onto_name = options.upstream_name;
1883 if (strstr(options.onto_name, "...")) {
1884 if (get_oid_mb(options.onto_name, &merge_base) < 0) {
1885 if (keep_base)
1886 die(_("'%s': need exactly one merge base with branch"),
1887 options.upstream_name);
1888 else
1889 die(_("'%s': need exactly one merge base"),
1890 options.onto_name);
1891 }
1892 options.onto = lookup_commit_or_die(&merge_base,
1893 options.onto_name);
1894 } else {
1895 options.onto = peel_committish(options.onto_name);
1896 if (!options.onto)
1897 die(_("Does not point to a valid commit '%s'"),
1898 options.onto_name);
1899 }
1900
1901 /*
1902 * If the branch to rebase is given, that is the branch we will rebase
1903 * branch_name -- branch/commit being rebased, or
1904 * HEAD (already detached)
1905 * orig_head -- commit object name of tip of the branch before rebasing
1906 * head_name -- refs/heads/<that-branch> or NULL (detached HEAD)
1907 */
1908 if (argc == 1) {
1909 /* Is it "rebase other branchname" or "rebase other commit"? */
1910 branch_name = argv[0];
1911 options.switch_to = argv[0];
1912
1913 /* Is it a local branch? */
1914 strbuf_reset(&buf);
1915 strbuf_addf(&buf, "refs/heads/%s", branch_name);
1916 if (!read_ref(buf.buf, &options.orig_head)) {
1917 die_if_checked_out(buf.buf, 1);
1918 options.head_name = xstrdup(buf.buf);
1919 /* If not is it a valid ref (branch or commit)? */
1920 } else if (!get_oid(branch_name, &options.orig_head) &&
1921 lookup_commit_reference(the_repository,
1922 &options.orig_head))
1923 options.head_name = NULL;
1924 else
1925 die(_("fatal: no such branch/commit '%s'"),
1926 branch_name);
1927 } else if (argc == 0) {
1928 /* Do not need to switch branches, we are already on it. */
1929 options.head_name =
1930 xstrdup_or_null(resolve_ref_unsafe("HEAD", 0, NULL,
1931 &flags));
1932 if (!options.head_name)
1933 die(_("No such ref: %s"), "HEAD");
1934 if (flags & REF_ISSYMREF) {
1935 if (!skip_prefix(options.head_name,
1936 "refs/heads/", &branch_name))
1937 branch_name = options.head_name;
1938
1939 } else {
1940 FREE_AND_NULL(options.head_name);
1941 branch_name = "HEAD";
1942 }
1943 if (get_oid("HEAD", &options.orig_head))
1944 die(_("Could not resolve HEAD to a revision"));
1945 } else
1946 BUG("unexpected number of arguments left to parse");
1947
1948 if (fork_point > 0) {
1949 struct commit *head =
1950 lookup_commit_reference(the_repository,
1951 &options.orig_head);
1952 options.restrict_revision =
1953 get_fork_point(options.upstream_name, head);
1954 }
1955
1956 if (repo_read_index(the_repository) < 0)
1957 die(_("could not read index"));
1958
1959 if (options.autostash) {
1960 create_autostash(the_repository, state_dir_path("autostash", &options),
1961 DEFAULT_REFLOG_ACTION);
1962 }
1963
1964 if (require_clean_work_tree(the_repository, "rebase",
1965 _("Please commit or stash them."), 1, 1)) {
1966 ret = 1;
1967 goto cleanup;
1968 }
1969
1970 /*
1971 * Now we are rebasing commits upstream..orig_head (or with --root,
1972 * everything leading up to orig_head) on top of onto.
1973 */
1974
1975 /*
1976 * Check if we are already based on onto with linear history,
1977 * in which case we could fast-forward without replacing the commits
1978 * with new commits recreated by replaying their changes.
1979 *
1980 * Note that can_fast_forward() initializes merge_base, so we have to
1981 * call it before checking allow_preemptive_ff.
1982 */
1983 if (can_fast_forward(options.onto, options.upstream, options.restrict_revision,
1984 &options.orig_head, &merge_base) &&
1985 allow_preemptive_ff) {
1986 int flag;
1987
1988 if (!(options.flags & REBASE_FORCE)) {
1989 /* Lazily switch to the target branch if needed... */
1990 if (options.switch_to) {
1991 strbuf_reset(&buf);
1992 strbuf_addf(&buf, "%s: checkout %s",
1993 getenv(GIT_REFLOG_ACTION_ENVIRONMENT),
1994 options.switch_to);
1995 if (reset_head(the_repository,
1996 &options.orig_head, "checkout",
1997 options.head_name,
1998 RESET_HEAD_RUN_POST_CHECKOUT_HOOK,
1999 NULL, buf.buf,
2000 DEFAULT_REFLOG_ACTION) < 0) {
2001 ret = !!error(_("could not switch to "
2002 "%s"),
2003 options.switch_to);
2004 goto cleanup;
2005 }
2006 }
2007
2008 if (!(options.flags & REBASE_NO_QUIET))
2009 ; /* be quiet */
2010 else if (!strcmp(branch_name, "HEAD") &&
2011 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
2012 puts(_("HEAD is up to date."));
2013 else
2014 printf(_("Current branch %s is up to date.\n"),
2015 branch_name);
2016 ret = !!finish_rebase(&options);
2017 goto cleanup;
2018 } else if (!(options.flags & REBASE_NO_QUIET))
2019 ; /* be quiet */
2020 else if (!strcmp(branch_name, "HEAD") &&
2021 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
2022 puts(_("HEAD is up to date, rebase forced."));
2023 else
2024 printf(_("Current branch %s is up to date, rebase "
2025 "forced.\n"), branch_name);
2026 }
2027
2028 /* If a hook exists, give it a chance to interrupt*/
2029 if (!ok_to_skip_pre_rebase &&
2030 run_hook_le(NULL, "pre-rebase", options.upstream_arg,
2031 argc ? argv[0] : NULL, NULL))
2032 die(_("The pre-rebase hook refused to rebase."));
2033
2034 if (options.flags & REBASE_DIFFSTAT) {
2035 struct diff_options opts;
2036
2037 if (options.flags & REBASE_VERBOSE) {
2038 if (is_null_oid(&merge_base))
2039 printf(_("Changes to %s:\n"),
2040 oid_to_hex(&options.onto->object.oid));
2041 else
2042 printf(_("Changes from %s to %s:\n"),
2043 oid_to_hex(&merge_base),
2044 oid_to_hex(&options.onto->object.oid));
2045 }
2046
2047 /* We want color (if set), but no pager */
2048 diff_setup(&opts);
2049 opts.stat_width = -1; /* use full terminal width */
2050 opts.stat_graph_width = -1; /* respect statGraphWidth config */
2051 opts.output_format |=
2052 DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
2053 opts.detect_rename = DIFF_DETECT_RENAME;
2054 diff_setup_done(&opts);
2055 diff_tree_oid(is_null_oid(&merge_base) ?
2056 the_hash_algo->empty_tree : &merge_base,
2057 &options.onto->object.oid, "", &opts);
2058 diffcore_std(&opts);
2059 diff_flush(&opts);
2060 }
2061
2062 if (is_merge(&options))
2063 goto run_rebase;
2064
2065 /* Detach HEAD and reset the tree */
2066 if (options.flags & REBASE_NO_QUIET)
2067 printf(_("First, rewinding head to replay your work on top of "
2068 "it...\n"));
2069
2070 strbuf_addf(&msg, "%s: checkout %s",
2071 getenv(GIT_REFLOG_ACTION_ENVIRONMENT), options.onto_name);
2072 if (reset_head(the_repository, &options.onto->object.oid, "checkout", NULL,
2073 RESET_HEAD_DETACH | RESET_ORIG_HEAD |
2074 RESET_HEAD_RUN_POST_CHECKOUT_HOOK,
2075 NULL, msg.buf, DEFAULT_REFLOG_ACTION))
2076 die(_("Could not detach HEAD"));
2077 strbuf_release(&msg);
2078
2079 /*
2080 * If the onto is a proper descendant of the tip of the branch, then
2081 * we just fast-forwarded.
2082 */
2083 strbuf_reset(&msg);
2084 if (oideq(&merge_base, &options.orig_head)) {
2085 printf(_("Fast-forwarded %s to %s.\n"),
2086 branch_name, options.onto_name);
2087 strbuf_addf(&msg, "rebase finished: %s onto %s",
2088 options.head_name ? options.head_name : "detached HEAD",
2089 oid_to_hex(&options.onto->object.oid));
2090 reset_head(the_repository, NULL, "Fast-forwarded", options.head_name,
2091 RESET_HEAD_REFS_ONLY, "HEAD", msg.buf,
2092 DEFAULT_REFLOG_ACTION);
2093 strbuf_release(&msg);
2094 ret = !!finish_rebase(&options);
2095 goto cleanup;
2096 }
2097
2098 strbuf_addf(&revisions, "%s..%s",
2099 options.root ? oid_to_hex(&options.onto->object.oid) :
2100 (options.restrict_revision ?
2101 oid_to_hex(&options.restrict_revision->object.oid) :
2102 oid_to_hex(&options.upstream->object.oid)),
2103 oid_to_hex(&options.orig_head));
2104
2105 options.revisions = revisions.buf;
2106
2107 run_rebase:
2108 ret = !!run_specific_rebase(&options, action);
2109
2110 cleanup:
2111 strbuf_release(&buf);
2112 strbuf_release(&revisions);
2113 free(options.head_name);
2114 free(options.gpg_sign_opt);
2115 free(options.cmd);
2116 free(squash_onto_name);
2117 return ret;
2118 }
Unnamed repository; edit this file 'description' to name the repository.