Merge branch 'dl/rebase-i-keep-base'
[git/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 "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"
30
31 static char const * const builtin_rebase_usage[] = {
32 N_("git rebase [-i] [options] [--exec <cmd>] "
33 "[--onto <newbase> | --keep-base] [<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 };
39
40 static GIT_PATH_FUNC(path_squash_onto, "rebase-merge/squash-onto")
41 static GIT_PATH_FUNC(path_interactive, "rebase-merge/interactive")
42 static GIT_PATH_FUNC(apply_dir, "rebase-apply")
43 static GIT_PATH_FUNC(merge_dir, "rebase-merge")
44
45 enum rebase_type {
46 REBASE_UNSPECIFIED = -1,
47 REBASE_AM,
48 REBASE_MERGE,
49 REBASE_INTERACTIVE,
50 REBASE_PRESERVE_MERGES
51 };
52
53 struct 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, root_with_onto;
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 int use_legacy_rebase;
91 };
92
93 #define REBASE_OPTIONS_INIT { \
94 .type = REBASE_UNSPECIFIED, \
95 .flags = REBASE_NO_QUIET, \
96 .git_am_opts = ARGV_ARRAY_INIT, \
97 .git_format_patch_opt = STRBUF_INIT \
98 }
99
100 static struct replay_opts get_replay_opts(const struct rebase_options *opts)
101 {
102 struct replay_opts replay = REPLAY_OPTS_INIT;
103
104 replay.action = REPLAY_INTERACTIVE_REBASE;
105 sequencer_init_config(&replay);
106
107 replay.signoff = opts->signoff;
108 replay.allow_ff = !(opts->flags & REBASE_FORCE);
109 if (opts->allow_rerere_autoupdate)
110 replay.allow_rerere_auto = opts->allow_rerere_autoupdate;
111 replay.allow_empty = 1;
112 replay.allow_empty_message = opts->allow_empty_message;
113 replay.verbose = opts->flags & REBASE_VERBOSE;
114 replay.reschedule_failed_exec = opts->reschedule_failed_exec;
115 replay.gpg_sign = xstrdup_or_null(opts->gpg_sign_opt);
116 replay.strategy = opts->strategy;
117 if (opts->strategy_opts)
118 parse_strategy_opts(&replay, opts->strategy_opts);
119
120 return replay;
121 }
122
123 enum action {
124 ACTION_NONE = 0,
125 ACTION_CONTINUE,
126 ACTION_SKIP,
127 ACTION_ABORT,
128 ACTION_QUIT,
129 ACTION_EDIT_TODO,
130 ACTION_SHOW_CURRENT_PATCH,
131 ACTION_SHORTEN_OIDS,
132 ACTION_EXPAND_OIDS,
133 ACTION_CHECK_TODO_LIST,
134 ACTION_REARRANGE_SQUASH,
135 ACTION_ADD_EXEC
136 };
137
138 static const char *action_names[] = { "undefined",
139 "continue",
140 "skip",
141 "abort",
142 "quit",
143 "edit_todo",
144 "show_current_patch" };
145
146 static int add_exec_commands(struct string_list *commands)
147 {
148 const char *todo_file = rebase_path_todo();
149 struct todo_list todo_list = TODO_LIST_INIT;
150 int res;
151
152 if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
153 return error_errno(_("could not read '%s'."), todo_file);
154
155 if (todo_list_parse_insn_buffer(the_repository, todo_list.buf.buf,
156 &todo_list)) {
157 todo_list_release(&todo_list);
158 return error(_("unusable todo list: '%s'"), todo_file);
159 }
160
161 todo_list_add_exec_commands(&todo_list, commands);
162 res = todo_list_write_to_file(the_repository, &todo_list,
163 todo_file, NULL, NULL, -1, 0);
164 todo_list_release(&todo_list);
165
166 if (res)
167 return error_errno(_("could not write '%s'."), todo_file);
168 return 0;
169 }
170
171 static int rearrange_squash_in_todo_file(void)
172 {
173 const char *todo_file = rebase_path_todo();
174 struct todo_list todo_list = TODO_LIST_INIT;
175 int res = 0;
176
177 if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
178 return error_errno(_("could not read '%s'."), todo_file);
179 if (todo_list_parse_insn_buffer(the_repository, todo_list.buf.buf,
180 &todo_list)) {
181 todo_list_release(&todo_list);
182 return error(_("unusable todo list: '%s'"), todo_file);
183 }
184
185 res = todo_list_rearrange_squash(&todo_list);
186 if (!res)
187 res = todo_list_write_to_file(the_repository, &todo_list,
188 todo_file, NULL, NULL, -1, 0);
189
190 todo_list_release(&todo_list);
191
192 if (res)
193 return error_errno(_("could not write '%s'."), todo_file);
194 return 0;
195 }
196
197 static int transform_todo_file(unsigned flags)
198 {
199 const char *todo_file = rebase_path_todo();
200 struct todo_list todo_list = TODO_LIST_INIT;
201 int res;
202
203 if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
204 return error_errno(_("could not read '%s'."), todo_file);
205
206 if (todo_list_parse_insn_buffer(the_repository, todo_list.buf.buf,
207 &todo_list)) {
208 todo_list_release(&todo_list);
209 return error(_("unusable todo list: '%s'"), todo_file);
210 }
211
212 res = todo_list_write_to_file(the_repository, &todo_list, todo_file,
213 NULL, NULL, -1, flags);
214 todo_list_release(&todo_list);
215
216 if (res)
217 return error_errno(_("could not write '%s'."), todo_file);
218 return 0;
219 }
220
221 static int edit_todo_file(unsigned flags)
222 {
223 const char *todo_file = rebase_path_todo();
224 struct todo_list todo_list = TODO_LIST_INIT,
225 new_todo = TODO_LIST_INIT;
226 int res = 0;
227
228 if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
229 return error_errno(_("could not read '%s'."), todo_file);
230
231 strbuf_stripspace(&todo_list.buf, 1);
232 res = edit_todo_list(the_repository, &todo_list, &new_todo, NULL, NULL, flags);
233 if (!res && todo_list_write_to_file(the_repository, &new_todo, todo_file,
234 NULL, NULL, -1, flags & ~(TODO_LIST_SHORTEN_IDS)))
235 res = error_errno(_("could not write '%s'"), todo_file);
236
237 todo_list_release(&todo_list);
238 todo_list_release(&new_todo);
239
240 return res;
241 }
242
243 static int get_revision_ranges(struct commit *upstream, struct commit *onto,
244 const char **head_hash,
245 char **revisions, char **shortrevisions)
246 {
247 struct commit *base_rev = upstream ? upstream : onto;
248 const char *shorthead;
249 struct object_id orig_head;
250
251 if (get_oid("HEAD", &orig_head))
252 return error(_("no HEAD?"));
253
254 *head_hash = find_unique_abbrev(&orig_head, GIT_MAX_HEXSZ);
255 *revisions = xstrfmt("%s...%s", oid_to_hex(&base_rev->object.oid),
256 *head_hash);
257
258 shorthead = find_unique_abbrev(&orig_head, DEFAULT_ABBREV);
259
260 if (upstream) {
261 const char *shortrev;
262
263 shortrev = find_unique_abbrev(&base_rev->object.oid,
264 DEFAULT_ABBREV);
265
266 *shortrevisions = xstrfmt("%s..%s", shortrev, shorthead);
267 } else
268 *shortrevisions = xstrdup(shorthead);
269
270 return 0;
271 }
272
273 static int init_basic_state(struct replay_opts *opts, const char *head_name,
274 struct commit *onto, const char *orig_head)
275 {
276 FILE *interactive;
277
278 if (!is_directory(merge_dir()) && mkdir_in_gitdir(merge_dir()))
279 return error_errno(_("could not create temporary %s"), merge_dir());
280
281 delete_reflog("REBASE_HEAD");
282
283 interactive = fopen(path_interactive(), "w");
284 if (!interactive)
285 return error_errno(_("could not mark as interactive"));
286 fclose(interactive);
287
288 return write_basic_state(opts, head_name, onto, orig_head);
289 }
290
291 static void split_exec_commands(const char *cmd, struct string_list *commands)
292 {
293 if (cmd && *cmd) {
294 string_list_split(commands, cmd, '\n', -1);
295
296 /* rebase.c adds a new line to cmd after every command,
297 * so here the last command is always empty */
298 string_list_remove_empty_items(commands, 0);
299 }
300 }
301
302 static int do_interactive_rebase(struct rebase_options *opts, unsigned flags)
303 {
304 int ret;
305 const char *head_hash = NULL;
306 char *revisions = NULL, *shortrevisions = NULL;
307 struct argv_array make_script_args = ARGV_ARRAY_INIT;
308 struct todo_list todo_list = TODO_LIST_INIT;
309 struct replay_opts replay = get_replay_opts(opts);
310 struct string_list commands = STRING_LIST_INIT_DUP;
311
312 if (prepare_branch_to_be_rebased(the_repository, &replay,
313 opts->switch_to))
314 return -1;
315
316 if (get_revision_ranges(opts->upstream, opts->onto, &head_hash,
317 &revisions, &shortrevisions))
318 return -1;
319
320 if (init_basic_state(&replay,
321 opts->head_name ? opts->head_name : "detached HEAD",
322 opts->onto, head_hash)) {
323 free(revisions);
324 free(shortrevisions);
325
326 return -1;
327 }
328
329 if (!opts->upstream && opts->squash_onto)
330 write_file(path_squash_onto(), "%s\n",
331 oid_to_hex(opts->squash_onto));
332
333 argv_array_pushl(&make_script_args, "", revisions, NULL);
334 if (opts->restrict_revision)
335 argv_array_push(&make_script_args,
336 oid_to_hex(&opts->restrict_revision->object.oid));
337
338 ret = sequencer_make_script(the_repository, &todo_list.buf,
339 make_script_args.argc, make_script_args.argv,
340 flags);
341
342 if (ret)
343 error(_("could not generate todo list"));
344 else {
345 discard_cache();
346 if (todo_list_parse_insn_buffer(the_repository, todo_list.buf.buf,
347 &todo_list))
348 BUG("unusable todo list");
349
350 split_exec_commands(opts->cmd, &commands);
351 ret = complete_action(the_repository, &replay, flags,
352 shortrevisions, opts->onto_name, opts->onto, head_hash,
353 &commands, opts->autosquash, &todo_list);
354 }
355
356 string_list_clear(&commands, 0);
357 free(revisions);
358 free(shortrevisions);
359 todo_list_release(&todo_list);
360 argv_array_clear(&make_script_args);
361
362 return ret;
363 }
364
365 static int run_rebase_interactive(struct rebase_options *opts,
366 enum action command)
367 {
368 unsigned flags = 0;
369 int abbreviate_commands = 0, ret = 0;
370
371 git_config_get_bool("rebase.abbreviatecommands", &abbreviate_commands);
372
373 flags |= opts->keep_empty ? TODO_LIST_KEEP_EMPTY : 0;
374 flags |= abbreviate_commands ? TODO_LIST_ABBREVIATE_CMDS : 0;
375 flags |= opts->rebase_merges ? TODO_LIST_REBASE_MERGES : 0;
376 flags |= opts->rebase_cousins > 0 ? TODO_LIST_REBASE_COUSINS : 0;
377 flags |= opts->root_with_onto ? TODO_LIST_ROOT_WITH_ONTO : 0;
378 flags |= command == ACTION_SHORTEN_OIDS ? TODO_LIST_SHORTEN_IDS : 0;
379
380 switch (command) {
381 case ACTION_NONE: {
382 if (!opts->onto && !opts->upstream)
383 die(_("a base commit must be provided with --upstream or --onto"));
384
385 ret = do_interactive_rebase(opts, flags);
386 break;
387 }
388 case ACTION_SKIP: {
389 struct string_list merge_rr = STRING_LIST_INIT_DUP;
390
391 rerere_clear(the_repository, &merge_rr);
392 }
393 /* fallthrough */
394 case ACTION_CONTINUE: {
395 struct replay_opts replay_opts = get_replay_opts(opts);
396
397 ret = sequencer_continue(the_repository, &replay_opts);
398 break;
399 }
400 case ACTION_EDIT_TODO:
401 ret = edit_todo_file(flags);
402 break;
403 case ACTION_SHOW_CURRENT_PATCH: {
404 struct child_process cmd = CHILD_PROCESS_INIT;
405
406 cmd.git_cmd = 1;
407 argv_array_pushl(&cmd.args, "show", "REBASE_HEAD", "--", NULL);
408 ret = run_command(&cmd);
409
410 break;
411 }
412 case ACTION_SHORTEN_OIDS:
413 case ACTION_EXPAND_OIDS:
414 ret = transform_todo_file(flags);
415 break;
416 case ACTION_CHECK_TODO_LIST:
417 ret = check_todo_list_from_file(the_repository);
418 break;
419 case ACTION_REARRANGE_SQUASH:
420 ret = rearrange_squash_in_todo_file();
421 break;
422 case ACTION_ADD_EXEC: {
423 struct string_list commands = STRING_LIST_INIT_DUP;
424
425 split_exec_commands(opts->cmd, &commands);
426 ret = add_exec_commands(&commands);
427 string_list_clear(&commands, 0);
428 break;
429 }
430 default:
431 BUG("invalid command '%d'", command);
432 }
433
434 return ret;
435 }
436
437 static const char * const builtin_rebase_interactive_usage[] = {
438 N_("git rebase--interactive [<options>]"),
439 NULL
440 };
441
442 int cmd_rebase__interactive(int argc, const char **argv, const char *prefix)
443 {
444 struct rebase_options opts = REBASE_OPTIONS_INIT;
445 struct object_id squash_onto = null_oid;
446 enum action command = ACTION_NONE;
447 struct option options[] = {
448 OPT_NEGBIT(0, "ff", &opts.flags, N_("allow fast-forward"),
449 REBASE_FORCE),
450 OPT_BOOL(0, "keep-empty", &opts.keep_empty, N_("keep empty commits")),
451 OPT_BOOL(0, "allow-empty-message", &opts.allow_empty_message,
452 N_("allow commits with empty messages")),
453 OPT_BOOL(0, "rebase-merges", &opts.rebase_merges, N_("rebase merge commits")),
454 OPT_BOOL(0, "rebase-cousins", &opts.rebase_cousins,
455 N_("keep original branch points of cousins")),
456 OPT_BOOL(0, "autosquash", &opts.autosquash,
457 N_("move commits that begin with squash!/fixup!")),
458 OPT_BOOL(0, "signoff", &opts.signoff, N_("sign commits")),
459 OPT_BIT('v', "verbose", &opts.flags,
460 N_("display a diffstat of what changed upstream"),
461 REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT),
462 OPT_CMDMODE(0, "continue", &command, N_("continue rebase"),
463 ACTION_CONTINUE),
464 OPT_CMDMODE(0, "skip", &command, N_("skip commit"), ACTION_SKIP),
465 OPT_CMDMODE(0, "edit-todo", &command, N_("edit the todo list"),
466 ACTION_EDIT_TODO),
467 OPT_CMDMODE(0, "show-current-patch", &command, N_("show the current patch"),
468 ACTION_SHOW_CURRENT_PATCH),
469 OPT_CMDMODE(0, "shorten-ids", &command,
470 N_("shorten commit ids in the todo list"), ACTION_SHORTEN_OIDS),
471 OPT_CMDMODE(0, "expand-ids", &command,
472 N_("expand commit ids in the todo list"), ACTION_EXPAND_OIDS),
473 OPT_CMDMODE(0, "check-todo-list", &command,
474 N_("check the todo list"), ACTION_CHECK_TODO_LIST),
475 OPT_CMDMODE(0, "rearrange-squash", &command,
476 N_("rearrange fixup/squash lines"), ACTION_REARRANGE_SQUASH),
477 OPT_CMDMODE(0, "add-exec-commands", &command,
478 N_("insert exec commands in todo list"), ACTION_ADD_EXEC),
479 { OPTION_CALLBACK, 0, "onto", &opts.onto, N_("onto"), N_("onto"),
480 PARSE_OPT_NONEG, parse_opt_commit, 0 },
481 { OPTION_CALLBACK, 0, "restrict-revision", &opts.restrict_revision,
482 N_("restrict-revision"), N_("restrict revision"),
483 PARSE_OPT_NONEG, parse_opt_commit, 0 },
484 { OPTION_CALLBACK, 0, "squash-onto", &squash_onto, N_("squash-onto"),
485 N_("squash onto"), PARSE_OPT_NONEG, parse_opt_object_id, 0 },
486 { OPTION_CALLBACK, 0, "upstream", &opts.upstream, N_("upstream"),
487 N_("the upstream commit"), PARSE_OPT_NONEG, parse_opt_commit,
488 0 },
489 OPT_STRING(0, "head-name", &opts.head_name, N_("head-name"), N_("head name")),
490 { OPTION_STRING, 'S', "gpg-sign", &opts.gpg_sign_opt, N_("key-id"),
491 N_("GPG-sign commits"),
492 PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
493 OPT_STRING(0, "strategy", &opts.strategy, N_("strategy"),
494 N_("rebase strategy")),
495 OPT_STRING(0, "strategy-opts", &opts.strategy_opts, N_("strategy-opts"),
496 N_("strategy options")),
497 OPT_STRING(0, "switch-to", &opts.switch_to, N_("switch-to"),
498 N_("the branch or commit to checkout")),
499 OPT_STRING(0, "onto-name", &opts.onto_name, N_("onto-name"), N_("onto name")),
500 OPT_STRING(0, "cmd", &opts.cmd, N_("cmd"), N_("the command to run")),
501 OPT_RERERE_AUTOUPDATE(&opts.allow_rerere_autoupdate),
502 OPT_BOOL(0, "reschedule-failed-exec", &opts.reschedule_failed_exec,
503 N_("automatically re-schedule any `exec` that fails")),
504 OPT_END()
505 };
506
507 opts.rebase_cousins = -1;
508
509 if (argc == 1)
510 usage_with_options(builtin_rebase_interactive_usage, options);
511
512 argc = parse_options(argc, argv, prefix, options,
513 builtin_rebase_interactive_usage, PARSE_OPT_KEEP_ARGV0);
514
515 if (!is_null_oid(&squash_onto))
516 opts.squash_onto = &squash_onto;
517
518 if (opts.rebase_cousins >= 0 && !opts.rebase_merges)
519 warning(_("--[no-]rebase-cousins has no effect without "
520 "--rebase-merges"));
521
522 return !!run_rebase_interactive(&opts, command);
523 }
524
525 static int is_interactive(struct rebase_options *opts)
526 {
527 return opts->type == REBASE_INTERACTIVE ||
528 opts->type == REBASE_PRESERVE_MERGES;
529 }
530
531 static void imply_interactive(struct rebase_options *opts, const char *option)
532 {
533 switch (opts->type) {
534 case REBASE_AM:
535 die(_("%s requires an interactive rebase"), option);
536 break;
537 case REBASE_INTERACTIVE:
538 case REBASE_PRESERVE_MERGES:
539 break;
540 case REBASE_MERGE:
541 /* we now implement --merge via --interactive */
542 default:
543 opts->type = REBASE_INTERACTIVE; /* implied */
544 break;
545 }
546 }
547
548 /* Returns the filename prefixed by the state_dir */
549 static const char *state_dir_path(const char *filename, struct rebase_options *opts)
550 {
551 static struct strbuf path = STRBUF_INIT;
552 static size_t prefix_len;
553
554 if (!prefix_len) {
555 strbuf_addf(&path, "%s/", opts->state_dir);
556 prefix_len = path.len;
557 }
558
559 strbuf_setlen(&path, prefix_len);
560 strbuf_addstr(&path, filename);
561 return path.buf;
562 }
563
564 /* Read one file, then strip line endings */
565 static int read_one(const char *path, struct strbuf *buf)
566 {
567 if (strbuf_read_file(buf, path, 0) < 0)
568 return error_errno(_("could not read '%s'"), path);
569 strbuf_trim_trailing_newline(buf);
570 return 0;
571 }
572
573 /* Initialize the rebase options from the state directory. */
574 static int read_basic_state(struct rebase_options *opts)
575 {
576 struct strbuf head_name = STRBUF_INIT;
577 struct strbuf buf = STRBUF_INIT;
578 struct object_id oid;
579
580 if (read_one(state_dir_path("head-name", opts), &head_name) ||
581 read_one(state_dir_path("onto", opts), &buf))
582 return -1;
583 opts->head_name = starts_with(head_name.buf, "refs/") ?
584 xstrdup(head_name.buf) : NULL;
585 strbuf_release(&head_name);
586 if (get_oid(buf.buf, &oid))
587 return error(_("could not get 'onto': '%s'"), buf.buf);
588 opts->onto = lookup_commit_or_die(&oid, buf.buf);
589
590 /*
591 * We always write to orig-head, but interactive rebase used to write to
592 * head. Fall back to reading from head to cover for the case that the
593 * user upgraded git with an ongoing interactive rebase.
594 */
595 strbuf_reset(&buf);
596 if (file_exists(state_dir_path("orig-head", opts))) {
597 if (read_one(state_dir_path("orig-head", opts), &buf))
598 return -1;
599 } else if (read_one(state_dir_path("head", opts), &buf))
600 return -1;
601 if (get_oid(buf.buf, &opts->orig_head))
602 return error(_("invalid orig-head: '%s'"), buf.buf);
603
604 if (file_exists(state_dir_path("quiet", opts)))
605 opts->flags &= ~REBASE_NO_QUIET;
606 else
607 opts->flags |= REBASE_NO_QUIET;
608
609 if (file_exists(state_dir_path("verbose", opts)))
610 opts->flags |= REBASE_VERBOSE;
611
612 if (file_exists(state_dir_path("signoff", opts))) {
613 opts->signoff = 1;
614 opts->flags |= REBASE_FORCE;
615 }
616
617 if (file_exists(state_dir_path("allow_rerere_autoupdate", opts))) {
618 strbuf_reset(&buf);
619 if (read_one(state_dir_path("allow_rerere_autoupdate", opts),
620 &buf))
621 return -1;
622 if (!strcmp(buf.buf, "--rerere-autoupdate"))
623 opts->allow_rerere_autoupdate = RERERE_AUTOUPDATE;
624 else if (!strcmp(buf.buf, "--no-rerere-autoupdate"))
625 opts->allow_rerere_autoupdate = RERERE_NOAUTOUPDATE;
626 else
627 warning(_("ignoring invalid allow_rerere_autoupdate: "
628 "'%s'"), buf.buf);
629 }
630
631 if (file_exists(state_dir_path("gpg_sign_opt", opts))) {
632 strbuf_reset(&buf);
633 if (read_one(state_dir_path("gpg_sign_opt", opts),
634 &buf))
635 return -1;
636 free(opts->gpg_sign_opt);
637 opts->gpg_sign_opt = xstrdup(buf.buf);
638 }
639
640 if (file_exists(state_dir_path("strategy", opts))) {
641 strbuf_reset(&buf);
642 if (read_one(state_dir_path("strategy", opts), &buf))
643 return -1;
644 free(opts->strategy);
645 opts->strategy = xstrdup(buf.buf);
646 }
647
648 if (file_exists(state_dir_path("strategy_opts", opts))) {
649 strbuf_reset(&buf);
650 if (read_one(state_dir_path("strategy_opts", opts), &buf))
651 return -1;
652 free(opts->strategy_opts);
653 opts->strategy_opts = xstrdup(buf.buf);
654 }
655
656 strbuf_release(&buf);
657
658 return 0;
659 }
660
661 static int rebase_write_basic_state(struct rebase_options *opts)
662 {
663 write_file(state_dir_path("head-name", opts), "%s",
664 opts->head_name ? opts->head_name : "detached HEAD");
665 write_file(state_dir_path("onto", opts), "%s",
666 opts->onto ? oid_to_hex(&opts->onto->object.oid) : "");
667 write_file(state_dir_path("orig-head", opts), "%s",
668 oid_to_hex(&opts->orig_head));
669 write_file(state_dir_path("quiet", opts), "%s",
670 opts->flags & REBASE_NO_QUIET ? "" : "t");
671 if (opts->flags & REBASE_VERBOSE)
672 write_file(state_dir_path("verbose", opts), "%s", "");
673 if (opts->strategy)
674 write_file(state_dir_path("strategy", opts), "%s",
675 opts->strategy);
676 if (opts->strategy_opts)
677 write_file(state_dir_path("strategy_opts", opts), "%s",
678 opts->strategy_opts);
679 if (opts->allow_rerere_autoupdate > 0)
680 write_file(state_dir_path("allow_rerere_autoupdate", opts),
681 "-%s-rerere-autoupdate",
682 opts->allow_rerere_autoupdate == RERERE_AUTOUPDATE ?
683 "" : "-no");
684 if (opts->gpg_sign_opt)
685 write_file(state_dir_path("gpg_sign_opt", opts), "%s",
686 opts->gpg_sign_opt);
687 if (opts->signoff)
688 write_file(state_dir_path("strategy", opts), "--signoff");
689
690 return 0;
691 }
692
693 static int apply_autostash(struct rebase_options *opts)
694 {
695 const char *path = state_dir_path("autostash", opts);
696 struct strbuf autostash = STRBUF_INIT;
697 struct child_process stash_apply = CHILD_PROCESS_INIT;
698
699 if (!file_exists(path))
700 return 0;
701
702 if (read_one(path, &autostash))
703 return error(_("Could not read '%s'"), path);
704 /* Ensure that the hash is not mistaken for a number */
705 strbuf_addstr(&autostash, "^0");
706 argv_array_pushl(&stash_apply.args,
707 "stash", "apply", autostash.buf, NULL);
708 stash_apply.git_cmd = 1;
709 stash_apply.no_stderr = stash_apply.no_stdout =
710 stash_apply.no_stdin = 1;
711 if (!run_command(&stash_apply))
712 printf(_("Applied autostash.\n"));
713 else {
714 struct argv_array args = ARGV_ARRAY_INIT;
715 int res = 0;
716
717 argv_array_pushl(&args,
718 "stash", "store", "-m", "autostash", "-q",
719 autostash.buf, NULL);
720 if (run_command_v_opt(args.argv, RUN_GIT_CMD))
721 res = error(_("Cannot store %s"), autostash.buf);
722 argv_array_clear(&args);
723 strbuf_release(&autostash);
724 if (res)
725 return res;
726
727 fprintf(stderr,
728 _("Applying autostash resulted in conflicts.\n"
729 "Your changes are safe in the stash.\n"
730 "You can run \"git stash pop\" or \"git stash drop\" "
731 "at any time.\n"));
732 }
733
734 strbuf_release(&autostash);
735 return 0;
736 }
737
738 static int finish_rebase(struct rebase_options *opts)
739 {
740 struct strbuf dir = STRBUF_INIT;
741 const char *argv_gc_auto[] = { "gc", "--auto", NULL };
742 int ret = 0;
743
744 delete_ref(NULL, "REBASE_HEAD", NULL, REF_NO_DEREF);
745 apply_autostash(opts);
746 close_object_store(the_repository->objects);
747 /*
748 * We ignore errors in 'gc --auto', since the
749 * user should see them.
750 */
751 run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
752 if (opts->type == REBASE_INTERACTIVE) {
753 struct replay_opts replay = REPLAY_OPTS_INIT;
754
755 replay.action = REPLAY_INTERACTIVE_REBASE;
756 ret = sequencer_remove_state(&replay);
757 } else {
758 strbuf_addstr(&dir, opts->state_dir);
759 if (remove_dir_recursively(&dir, 0))
760 ret = error(_("could not remove '%s'"),
761 opts->state_dir);
762 strbuf_release(&dir);
763 }
764
765 return ret;
766 }
767
768 static struct commit *peel_committish(const char *name)
769 {
770 struct object *obj;
771 struct object_id oid;
772
773 if (get_oid(name, &oid))
774 return NULL;
775 obj = parse_object(the_repository, &oid);
776 return (struct commit *)peel_to_type(name, 0, obj, OBJ_COMMIT);
777 }
778
779 static void add_var(struct strbuf *buf, const char *name, const char *value)
780 {
781 if (!value)
782 strbuf_addf(buf, "unset %s; ", name);
783 else {
784 strbuf_addf(buf, "%s=", name);
785 sq_quote_buf(buf, value);
786 strbuf_addstr(buf, "; ");
787 }
788 }
789
790 #define GIT_REFLOG_ACTION_ENVIRONMENT "GIT_REFLOG_ACTION"
791
792 #define RESET_HEAD_DETACH (1<<0)
793 #define RESET_HEAD_HARD (1<<1)
794 #define RESET_HEAD_RUN_POST_CHECKOUT_HOOK (1<<2)
795 #define RESET_HEAD_REFS_ONLY (1<<3)
796 #define RESET_ORIG_HEAD (1<<4)
797
798 static int reset_head(struct object_id *oid, const char *action,
799 const char *switch_to_branch, unsigned flags,
800 const char *reflog_orig_head, const char *reflog_head)
801 {
802 unsigned detach_head = flags & RESET_HEAD_DETACH;
803 unsigned reset_hard = flags & RESET_HEAD_HARD;
804 unsigned run_hook = flags & RESET_HEAD_RUN_POST_CHECKOUT_HOOK;
805 unsigned refs_only = flags & RESET_HEAD_REFS_ONLY;
806 unsigned update_orig_head = flags & RESET_ORIG_HEAD;
807 struct object_id head_oid;
808 struct tree_desc desc[2] = { { NULL }, { NULL } };
809 struct lock_file lock = LOCK_INIT;
810 struct unpack_trees_options unpack_tree_opts;
811 struct tree *tree;
812 const char *reflog_action;
813 struct strbuf msg = STRBUF_INIT;
814 size_t prefix_len;
815 struct object_id *orig = NULL, oid_orig,
816 *old_orig = NULL, oid_old_orig;
817 int ret = 0, nr = 0;
818
819 if (switch_to_branch && !starts_with(switch_to_branch, "refs/"))
820 BUG("Not a fully qualified branch: '%s'", switch_to_branch);
821
822 if (!refs_only && hold_locked_index(&lock, LOCK_REPORT_ON_ERROR) < 0) {
823 ret = -1;
824 goto leave_reset_head;
825 }
826
827 if ((!oid || !reset_hard) && get_oid("HEAD", &head_oid)) {
828 ret = error(_("could not determine HEAD revision"));
829 goto leave_reset_head;
830 }
831
832 if (!oid)
833 oid = &head_oid;
834
835 if (refs_only)
836 goto reset_head_refs;
837
838 memset(&unpack_tree_opts, 0, sizeof(unpack_tree_opts));
839 setup_unpack_trees_porcelain(&unpack_tree_opts, action);
840 unpack_tree_opts.head_idx = 1;
841 unpack_tree_opts.src_index = the_repository->index;
842 unpack_tree_opts.dst_index = the_repository->index;
843 unpack_tree_opts.fn = reset_hard ? oneway_merge : twoway_merge;
844 unpack_tree_opts.update = 1;
845 unpack_tree_opts.merge = 1;
846 if (!detach_head)
847 unpack_tree_opts.reset = 1;
848
849 if (repo_read_index_unmerged(the_repository) < 0) {
850 ret = error(_("could not read index"));
851 goto leave_reset_head;
852 }
853
854 if (!reset_hard && !fill_tree_descriptor(the_repository, &desc[nr++], &head_oid)) {
855 ret = error(_("failed to find tree of %s"),
856 oid_to_hex(&head_oid));
857 goto leave_reset_head;
858 }
859
860 if (!fill_tree_descriptor(the_repository, &desc[nr++], oid)) {
861 ret = error(_("failed to find tree of %s"), oid_to_hex(oid));
862 goto leave_reset_head;
863 }
864
865 if (unpack_trees(nr, desc, &unpack_tree_opts)) {
866 ret = -1;
867 goto leave_reset_head;
868 }
869
870 tree = parse_tree_indirect(oid);
871 prime_cache_tree(the_repository, the_repository->index, tree);
872
873 if (write_locked_index(the_repository->index, &lock, COMMIT_LOCK) < 0) {
874 ret = error(_("could not write index"));
875 goto leave_reset_head;
876 }
877
878 reset_head_refs:
879 reflog_action = getenv(GIT_REFLOG_ACTION_ENVIRONMENT);
880 strbuf_addf(&msg, "%s: ", reflog_action ? reflog_action : "rebase");
881 prefix_len = msg.len;
882
883 if (update_orig_head) {
884 if (!get_oid("ORIG_HEAD", &oid_old_orig))
885 old_orig = &oid_old_orig;
886 if (!get_oid("HEAD", &oid_orig)) {
887 orig = &oid_orig;
888 if (!reflog_orig_head) {
889 strbuf_addstr(&msg, "updating ORIG_HEAD");
890 reflog_orig_head = msg.buf;
891 }
892 update_ref(reflog_orig_head, "ORIG_HEAD", orig,
893 old_orig, 0, UPDATE_REFS_MSG_ON_ERR);
894 } else if (old_orig)
895 delete_ref(NULL, "ORIG_HEAD", old_orig, 0);
896 }
897
898 if (!reflog_head) {
899 strbuf_setlen(&msg, prefix_len);
900 strbuf_addstr(&msg, "updating HEAD");
901 reflog_head = msg.buf;
902 }
903 if (!switch_to_branch)
904 ret = update_ref(reflog_head, "HEAD", oid, orig,
905 detach_head ? REF_NO_DEREF : 0,
906 UPDATE_REFS_MSG_ON_ERR);
907 else {
908 ret = update_ref(reflog_head, switch_to_branch, oid,
909 NULL, 0, UPDATE_REFS_MSG_ON_ERR);
910 if (!ret)
911 ret = create_symref("HEAD", switch_to_branch,
912 reflog_head);
913 }
914 if (run_hook)
915 run_hook_le(NULL, "post-checkout",
916 oid_to_hex(orig ? orig : &null_oid),
917 oid_to_hex(oid), "1", NULL);
918
919 leave_reset_head:
920 strbuf_release(&msg);
921 rollback_lock_file(&lock);
922 while (nr)
923 free((void *)desc[--nr].buffer);
924 return ret;
925 }
926
927 static int move_to_original_branch(struct rebase_options *opts)
928 {
929 struct strbuf orig_head_reflog = STRBUF_INIT, head_reflog = STRBUF_INIT;
930 int ret;
931
932 if (!opts->head_name)
933 return 0; /* nothing to move back to */
934
935 if (!opts->onto)
936 BUG("move_to_original_branch without onto");
937
938 strbuf_addf(&orig_head_reflog, "rebase finished: %s onto %s",
939 opts->head_name, oid_to_hex(&opts->onto->object.oid));
940 strbuf_addf(&head_reflog, "rebase finished: returning to %s",
941 opts->head_name);
942 ret = reset_head(NULL, "", opts->head_name, RESET_HEAD_REFS_ONLY,
943 orig_head_reflog.buf, head_reflog.buf);
944
945 strbuf_release(&orig_head_reflog);
946 strbuf_release(&head_reflog);
947 return ret;
948 }
949
950 static const char *resolvemsg =
951 N_("Resolve all conflicts manually, mark them as resolved with\n"
952 "\"git add/rm <conflicted_files>\", then run \"git rebase --continue\".\n"
953 "You can instead skip this commit: run \"git rebase --skip\".\n"
954 "To abort and get back to the state before \"git rebase\", run "
955 "\"git rebase --abort\".");
956
957 static int run_am(struct rebase_options *opts)
958 {
959 struct child_process am = CHILD_PROCESS_INIT;
960 struct child_process format_patch = CHILD_PROCESS_INIT;
961 struct strbuf revisions = STRBUF_INIT;
962 int status;
963 char *rebased_patches;
964
965 am.git_cmd = 1;
966 argv_array_push(&am.args, "am");
967
968 if (opts->action && !strcmp("continue", opts->action)) {
969 argv_array_push(&am.args, "--resolved");
970 argv_array_pushf(&am.args, "--resolvemsg=%s", resolvemsg);
971 if (opts->gpg_sign_opt)
972 argv_array_push(&am.args, opts->gpg_sign_opt);
973 status = run_command(&am);
974 if (status)
975 return status;
976
977 return move_to_original_branch(opts);
978 }
979 if (opts->action && !strcmp("skip", opts->action)) {
980 argv_array_push(&am.args, "--skip");
981 argv_array_pushf(&am.args, "--resolvemsg=%s", resolvemsg);
982 status = run_command(&am);
983 if (status)
984 return status;
985
986 return move_to_original_branch(opts);
987 }
988 if (opts->action && !strcmp("show-current-patch", opts->action)) {
989 argv_array_push(&am.args, "--show-current-patch");
990 return run_command(&am);
991 }
992
993 strbuf_addf(&revisions, "%s...%s",
994 oid_to_hex(opts->root ?
995 /* this is now equivalent to !opts->upstream */
996 &opts->onto->object.oid :
997 &opts->upstream->object.oid),
998 oid_to_hex(&opts->orig_head));
999
1000 rebased_patches = xstrdup(git_path("rebased-patches"));
1001 format_patch.out = open(rebased_patches,
1002 O_WRONLY | O_CREAT | O_TRUNC, 0666);
1003 if (format_patch.out < 0) {
1004 status = error_errno(_("could not open '%s' for writing"),
1005 rebased_patches);
1006 free(rebased_patches);
1007 argv_array_clear(&am.args);
1008 return status;
1009 }
1010
1011 format_patch.git_cmd = 1;
1012 argv_array_pushl(&format_patch.args, "format-patch", "-k", "--stdout",
1013 "--full-index", "--cherry-pick", "--right-only",
1014 "--src-prefix=a/", "--dst-prefix=b/", "--no-renames",
1015 "--no-cover-letter", "--pretty=mboxrd", "--topo-order", NULL);
1016 if (opts->git_format_patch_opt.len)
1017 argv_array_split(&format_patch.args,
1018 opts->git_format_patch_opt.buf);
1019 argv_array_push(&format_patch.args, revisions.buf);
1020 if (opts->restrict_revision)
1021 argv_array_pushf(&format_patch.args, "^%s",
1022 oid_to_hex(&opts->restrict_revision->object.oid));
1023
1024 status = run_command(&format_patch);
1025 if (status) {
1026 unlink(rebased_patches);
1027 free(rebased_patches);
1028 argv_array_clear(&am.args);
1029
1030 reset_head(&opts->orig_head, "checkout", opts->head_name, 0,
1031 "HEAD", NULL);
1032 error(_("\ngit encountered an error while preparing the "
1033 "patches to replay\n"
1034 "these revisions:\n"
1035 "\n %s\n\n"
1036 "As a result, git cannot rebase them."),
1037 opts->revisions);
1038
1039 strbuf_release(&revisions);
1040 return status;
1041 }
1042 strbuf_release(&revisions);
1043
1044 am.in = open(rebased_patches, O_RDONLY);
1045 if (am.in < 0) {
1046 status = error_errno(_("could not open '%s' for reading"),
1047 rebased_patches);
1048 free(rebased_patches);
1049 argv_array_clear(&am.args);
1050 return status;
1051 }
1052
1053 argv_array_pushv(&am.args, opts->git_am_opts.argv);
1054 argv_array_push(&am.args, "--rebasing");
1055 argv_array_pushf(&am.args, "--resolvemsg=%s", resolvemsg);
1056 argv_array_push(&am.args, "--patch-format=mboxrd");
1057 if (opts->allow_rerere_autoupdate == RERERE_AUTOUPDATE)
1058 argv_array_push(&am.args, "--rerere-autoupdate");
1059 else if (opts->allow_rerere_autoupdate == RERERE_NOAUTOUPDATE)
1060 argv_array_push(&am.args, "--no-rerere-autoupdate");
1061 if (opts->gpg_sign_opt)
1062 argv_array_push(&am.args, opts->gpg_sign_opt);
1063 status = run_command(&am);
1064 unlink(rebased_patches);
1065 free(rebased_patches);
1066
1067 if (!status) {
1068 return move_to_original_branch(opts);
1069 }
1070
1071 if (is_directory(opts->state_dir))
1072 rebase_write_basic_state(opts);
1073
1074 return status;
1075 }
1076
1077 static int run_specific_rebase(struct rebase_options *opts, enum action action)
1078 {
1079 const char *argv[] = { NULL, NULL };
1080 struct strbuf script_snippet = STRBUF_INIT, buf = STRBUF_INIT;
1081 int status;
1082 const char *backend, *backend_func;
1083
1084 if (opts->type == REBASE_INTERACTIVE) {
1085 /* Run builtin interactive rebase */
1086 setenv("GIT_CHERRY_PICK_HELP", resolvemsg, 1);
1087 if (!(opts->flags & REBASE_INTERACTIVE_EXPLICIT)) {
1088 setenv("GIT_SEQUENCE_EDITOR", ":", 1);
1089 opts->autosquash = 0;
1090 }
1091 if (opts->gpg_sign_opt) {
1092 /* remove the leading "-S" */
1093 char *tmp = xstrdup(opts->gpg_sign_opt + 2);
1094 free(opts->gpg_sign_opt);
1095 opts->gpg_sign_opt = tmp;
1096 }
1097
1098 status = run_rebase_interactive(opts, action);
1099 goto finished_rebase;
1100 }
1101
1102 if (opts->type == REBASE_AM) {
1103 status = run_am(opts);
1104 goto finished_rebase;
1105 }
1106
1107 add_var(&script_snippet, "GIT_DIR", absolute_path(get_git_dir()));
1108 add_var(&script_snippet, "state_dir", opts->state_dir);
1109
1110 add_var(&script_snippet, "upstream_name", opts->upstream_name);
1111 add_var(&script_snippet, "upstream", opts->upstream ?
1112 oid_to_hex(&opts->upstream->object.oid) : NULL);
1113 add_var(&script_snippet, "head_name",
1114 opts->head_name ? opts->head_name : "detached HEAD");
1115 add_var(&script_snippet, "orig_head", oid_to_hex(&opts->orig_head));
1116 add_var(&script_snippet, "onto", opts->onto ?
1117 oid_to_hex(&opts->onto->object.oid) : NULL);
1118 add_var(&script_snippet, "onto_name", opts->onto_name);
1119 add_var(&script_snippet, "revisions", opts->revisions);
1120 add_var(&script_snippet, "restrict_revision", opts->restrict_revision ?
1121 oid_to_hex(&opts->restrict_revision->object.oid) : NULL);
1122 add_var(&script_snippet, "GIT_QUIET",
1123 opts->flags & REBASE_NO_QUIET ? "" : "t");
1124 sq_quote_argv_pretty(&buf, opts->git_am_opts.argv);
1125 add_var(&script_snippet, "git_am_opt", buf.buf);
1126 strbuf_release(&buf);
1127 add_var(&script_snippet, "verbose",
1128 opts->flags & REBASE_VERBOSE ? "t" : "");
1129 add_var(&script_snippet, "diffstat",
1130 opts->flags & REBASE_DIFFSTAT ? "t" : "");
1131 add_var(&script_snippet, "force_rebase",
1132 opts->flags & REBASE_FORCE ? "t" : "");
1133 if (opts->switch_to)
1134 add_var(&script_snippet, "switch_to", opts->switch_to);
1135 add_var(&script_snippet, "action", opts->action ? opts->action : "");
1136 add_var(&script_snippet, "signoff", opts->signoff ? "--signoff" : "");
1137 add_var(&script_snippet, "allow_rerere_autoupdate",
1138 opts->allow_rerere_autoupdate ?
1139 opts->allow_rerere_autoupdate == RERERE_AUTOUPDATE ?
1140 "--rerere-autoupdate" : "--no-rerere-autoupdate" : "");
1141 add_var(&script_snippet, "keep_empty", opts->keep_empty ? "yes" : "");
1142 add_var(&script_snippet, "autosquash", opts->autosquash ? "t" : "");
1143 add_var(&script_snippet, "gpg_sign_opt", opts->gpg_sign_opt);
1144 add_var(&script_snippet, "cmd", opts->cmd);
1145 add_var(&script_snippet, "allow_empty_message",
1146 opts->allow_empty_message ? "--allow-empty-message" : "");
1147 add_var(&script_snippet, "rebase_merges",
1148 opts->rebase_merges ? "t" : "");
1149 add_var(&script_snippet, "rebase_cousins",
1150 opts->rebase_cousins ? "t" : "");
1151 add_var(&script_snippet, "strategy", opts->strategy);
1152 add_var(&script_snippet, "strategy_opts", opts->strategy_opts);
1153 add_var(&script_snippet, "rebase_root", opts->root ? "t" : "");
1154 add_var(&script_snippet, "squash_onto",
1155 opts->squash_onto ? oid_to_hex(opts->squash_onto) : "");
1156 add_var(&script_snippet, "git_format_patch_opt",
1157 opts->git_format_patch_opt.buf);
1158
1159 if (is_interactive(opts) &&
1160 !(opts->flags & REBASE_INTERACTIVE_EXPLICIT)) {
1161 strbuf_addstr(&script_snippet,
1162 "GIT_SEQUENCE_EDITOR=:; export GIT_SEQUENCE_EDITOR; ");
1163 opts->autosquash = 0;
1164 }
1165
1166 switch (opts->type) {
1167 case REBASE_PRESERVE_MERGES:
1168 backend = "git-rebase--preserve-merges";
1169 backend_func = "git_rebase__preserve_merges";
1170 break;
1171 default:
1172 BUG("Unhandled rebase type %d", opts->type);
1173 break;
1174 }
1175
1176 strbuf_addf(&script_snippet,
1177 ". git-sh-setup && . %s && %s", backend, backend_func);
1178 argv[0] = script_snippet.buf;
1179
1180 status = run_command_v_opt(argv, RUN_USING_SHELL);
1181 finished_rebase:
1182 if (opts->dont_finish_rebase)
1183 ; /* do nothing */
1184 else if (opts->type == REBASE_INTERACTIVE)
1185 ; /* interactive rebase cleans up after itself */
1186 else if (status == 0) {
1187 if (!file_exists(state_dir_path("stopped-sha", opts)))
1188 finish_rebase(opts);
1189 } else if (status == 2) {
1190 struct strbuf dir = STRBUF_INIT;
1191
1192 apply_autostash(opts);
1193 strbuf_addstr(&dir, opts->state_dir);
1194 remove_dir_recursively(&dir, 0);
1195 strbuf_release(&dir);
1196 die("Nothing to do");
1197 }
1198
1199 strbuf_release(&script_snippet);
1200
1201 return status ? -1 : 0;
1202 }
1203
1204 static int rebase_config(const char *var, const char *value, void *data)
1205 {
1206 struct rebase_options *opts = data;
1207
1208 if (!strcmp(var, "rebase.stat")) {
1209 if (git_config_bool(var, value))
1210 opts->flags |= REBASE_DIFFSTAT;
1211 else
1212 opts->flags &= ~REBASE_DIFFSTAT;
1213 return 0;
1214 }
1215
1216 if (!strcmp(var, "rebase.autosquash")) {
1217 opts->autosquash = git_config_bool(var, value);
1218 return 0;
1219 }
1220
1221 if (!strcmp(var, "commit.gpgsign")) {
1222 free(opts->gpg_sign_opt);
1223 opts->gpg_sign_opt = git_config_bool(var, value) ?
1224 xstrdup("-S") : NULL;
1225 return 0;
1226 }
1227
1228 if (!strcmp(var, "rebase.autostash")) {
1229 opts->autostash = git_config_bool(var, value);
1230 return 0;
1231 }
1232
1233 if (!strcmp(var, "rebase.reschedulefailedexec")) {
1234 opts->reschedule_failed_exec = git_config_bool(var, value);
1235 return 0;
1236 }
1237
1238 if (!strcmp(var, "rebase.usebuiltin")) {
1239 opts->use_legacy_rebase = !git_config_bool(var, value);
1240 return 0;
1241 }
1242
1243 return git_default_config(var, value, data);
1244 }
1245
1246 /*
1247 * Determines whether the commits in from..to are linear, i.e. contain
1248 * no merge commits. This function *expects* `from` to be an ancestor of
1249 * `to`.
1250 */
1251 static int is_linear_history(struct commit *from, struct commit *to)
1252 {
1253 while (to && to != from) {
1254 parse_commit(to);
1255 if (!to->parents)
1256 return 1;
1257 if (to->parents->next)
1258 return 0;
1259 to = to->parents->item;
1260 }
1261 return 1;
1262 }
1263
1264 static int can_fast_forward(struct commit *onto, struct commit *upstream,
1265 struct commit *restrict_revision,
1266 struct object_id *head_oid, struct object_id *merge_base)
1267 {
1268 struct commit *head = lookup_commit(the_repository, head_oid);
1269 struct commit_list *merge_bases = NULL;
1270 int res = 0;
1271
1272 if (!head)
1273 goto done;
1274
1275 merge_bases = get_merge_bases(onto, head);
1276 if (!merge_bases || merge_bases->next) {
1277 oidcpy(merge_base, &null_oid);
1278 goto done;
1279 }
1280
1281 oidcpy(merge_base, &merge_bases->item->object.oid);
1282 if (!oideq(merge_base, &onto->object.oid))
1283 goto done;
1284
1285 if (restrict_revision && !oideq(&restrict_revision->object.oid, merge_base))
1286 goto done;
1287
1288 if (!upstream)
1289 goto done;
1290
1291 free_commit_list(merge_bases);
1292 merge_bases = get_merge_bases(upstream, head);
1293 if (!merge_bases || merge_bases->next)
1294 goto done;
1295
1296 if (!oideq(&onto->object.oid, &merge_bases->item->object.oid))
1297 goto done;
1298
1299 res = 1;
1300
1301 done:
1302 free_commit_list(merge_bases);
1303 return res && is_linear_history(onto, head);
1304 }
1305
1306 /* -i followed by -m is still -i */
1307 static int parse_opt_merge(const struct option *opt, const char *arg, int unset)
1308 {
1309 struct rebase_options *opts = opt->value;
1310
1311 BUG_ON_OPT_NEG(unset);
1312 BUG_ON_OPT_ARG(arg);
1313
1314 if (!is_interactive(opts))
1315 opts->type = REBASE_MERGE;
1316
1317 return 0;
1318 }
1319
1320 /* -i followed by -p is still explicitly interactive, but -p alone is not */
1321 static int parse_opt_interactive(const struct option *opt, const char *arg,
1322 int unset)
1323 {
1324 struct rebase_options *opts = opt->value;
1325
1326 BUG_ON_OPT_NEG(unset);
1327 BUG_ON_OPT_ARG(arg);
1328
1329 opts->type = REBASE_INTERACTIVE;
1330 opts->flags |= REBASE_INTERACTIVE_EXPLICIT;
1331
1332 return 0;
1333 }
1334
1335 static void NORETURN error_on_missing_default_upstream(void)
1336 {
1337 struct branch *current_branch = branch_get(NULL);
1338
1339 printf(_("%s\n"
1340 "Please specify which branch you want to rebase against.\n"
1341 "See git-rebase(1) for details.\n"
1342 "\n"
1343 " git rebase '<branch>'\n"
1344 "\n"),
1345 current_branch ? _("There is no tracking information for "
1346 "the current branch.") :
1347 _("You are not currently on a branch."));
1348
1349 if (current_branch) {
1350 const char *remote = current_branch->remote_name;
1351
1352 if (!remote)
1353 remote = _("<remote>");
1354
1355 printf(_("If you wish to set tracking information for this "
1356 "branch you can do so with:\n"
1357 "\n"
1358 " git branch --set-upstream-to=%s/<branch> %s\n"
1359 "\n"),
1360 remote, current_branch->name);
1361 }
1362 exit(1);
1363 }
1364
1365 static void set_reflog_action(struct rebase_options *options)
1366 {
1367 const char *env;
1368 struct strbuf buf = STRBUF_INIT;
1369
1370 if (!is_interactive(options))
1371 return;
1372
1373 env = getenv(GIT_REFLOG_ACTION_ENVIRONMENT);
1374 if (env && strcmp("rebase", env))
1375 return; /* only override it if it is "rebase" */
1376
1377 strbuf_addf(&buf, "rebase -i (%s)", options->action);
1378 setenv(GIT_REFLOG_ACTION_ENVIRONMENT, buf.buf, 1);
1379 strbuf_release(&buf);
1380 }
1381
1382 static int check_exec_cmd(const char *cmd)
1383 {
1384 if (strchr(cmd, '\n'))
1385 return error(_("exec commands cannot contain newlines"));
1386
1387 /* Does the command consist purely of whitespace? */
1388 if (!cmd[strspn(cmd, " \t\r\f\v")])
1389 return error(_("empty exec command"));
1390
1391 return 0;
1392 }
1393
1394
1395 int cmd_rebase(int argc, const char **argv, const char *prefix)
1396 {
1397 struct rebase_options options = REBASE_OPTIONS_INIT;
1398 const char *branch_name;
1399 int ret, flags, total_argc, in_progress = 0;
1400 int keep_base = 0;
1401 int ok_to_skip_pre_rebase = 0;
1402 struct strbuf msg = STRBUF_INIT;
1403 struct strbuf revisions = STRBUF_INIT;
1404 struct strbuf buf = STRBUF_INIT;
1405 struct object_id merge_base;
1406 enum action action = ACTION_NONE;
1407 const char *gpg_sign = NULL;
1408 struct string_list exec = STRING_LIST_INIT_NODUP;
1409 const char *rebase_merges = NULL;
1410 int fork_point = -1;
1411 struct string_list strategy_options = STRING_LIST_INIT_NODUP;
1412 struct object_id squash_onto;
1413 char *squash_onto_name = NULL;
1414 int reschedule_failed_exec = -1;
1415 struct option builtin_rebase_options[] = {
1416 OPT_STRING(0, "onto", &options.onto_name,
1417 N_("revision"),
1418 N_("rebase onto given branch instead of upstream")),
1419 OPT_BOOL(0, "keep-base", &keep_base,
1420 N_("use the merge-base of upstream and branch as the current base")),
1421 OPT_BOOL(0, "no-verify", &ok_to_skip_pre_rebase,
1422 N_("allow pre-rebase hook to run")),
1423 OPT_NEGBIT('q', "quiet", &options.flags,
1424 N_("be quiet. implies --no-stat"),
1425 REBASE_NO_QUIET| REBASE_VERBOSE | REBASE_DIFFSTAT),
1426 OPT_BIT('v', "verbose", &options.flags,
1427 N_("display a diffstat of what changed upstream"),
1428 REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT),
1429 {OPTION_NEGBIT, 'n', "no-stat", &options.flags, NULL,
1430 N_("do not show diffstat of what changed upstream"),
1431 PARSE_OPT_NOARG, NULL, REBASE_DIFFSTAT },
1432 OPT_BOOL(0, "signoff", &options.signoff,
1433 N_("add a Signed-off-by: line to each commit")),
1434 OPT_PASSTHRU_ARGV(0, "ignore-whitespace", &options.git_am_opts,
1435 NULL, N_("passed to 'git am'"),
1436 PARSE_OPT_NOARG),
1437 OPT_PASSTHRU_ARGV(0, "committer-date-is-author-date",
1438 &options.git_am_opts, NULL,
1439 N_("passed to 'git am'"), PARSE_OPT_NOARG),
1440 OPT_PASSTHRU_ARGV(0, "ignore-date", &options.git_am_opts, NULL,
1441 N_("passed to 'git am'"), PARSE_OPT_NOARG),
1442 OPT_PASSTHRU_ARGV('C', NULL, &options.git_am_opts, N_("n"),
1443 N_("passed to 'git apply'"), 0),
1444 OPT_PASSTHRU_ARGV(0, "whitespace", &options.git_am_opts,
1445 N_("action"), N_("passed to 'git apply'"), 0),
1446 OPT_BIT('f', "force-rebase", &options.flags,
1447 N_("cherry-pick all commits, even if unchanged"),
1448 REBASE_FORCE),
1449 OPT_BIT(0, "no-ff", &options.flags,
1450 N_("cherry-pick all commits, even if unchanged"),
1451 REBASE_FORCE),
1452 OPT_CMDMODE(0, "continue", &action, N_("continue"),
1453 ACTION_CONTINUE),
1454 OPT_CMDMODE(0, "skip", &action,
1455 N_("skip current patch and continue"), ACTION_SKIP),
1456 OPT_CMDMODE(0, "abort", &action,
1457 N_("abort and check out the original branch"),
1458 ACTION_ABORT),
1459 OPT_CMDMODE(0, "quit", &action,
1460 N_("abort but keep HEAD where it is"), ACTION_QUIT),
1461 OPT_CMDMODE(0, "edit-todo", &action, N_("edit the todo list "
1462 "during an interactive rebase"), ACTION_EDIT_TODO),
1463 OPT_CMDMODE(0, "show-current-patch", &action,
1464 N_("show the patch file being applied or merged"),
1465 ACTION_SHOW_CURRENT_PATCH),
1466 { OPTION_CALLBACK, 'm', "merge", &options, NULL,
1467 N_("use merging strategies to rebase"),
1468 PARSE_OPT_NOARG | PARSE_OPT_NONEG,
1469 parse_opt_merge },
1470 { OPTION_CALLBACK, 'i', "interactive", &options, NULL,
1471 N_("let the user edit the list of commits to rebase"),
1472 PARSE_OPT_NOARG | PARSE_OPT_NONEG,
1473 parse_opt_interactive },
1474 OPT_SET_INT('p', "preserve-merges", &options.type,
1475 N_("(DEPRECATED) try to recreate merges instead of "
1476 "ignoring them"), REBASE_PRESERVE_MERGES),
1477 OPT_RERERE_AUTOUPDATE(&options.allow_rerere_autoupdate),
1478 OPT_BOOL('k', "keep-empty", &options.keep_empty,
1479 N_("preserve empty commits during rebase")),
1480 OPT_BOOL(0, "autosquash", &options.autosquash,
1481 N_("move commits that begin with "
1482 "squash!/fixup! under -i")),
1483 { OPTION_STRING, 'S', "gpg-sign", &gpg_sign, N_("key-id"),
1484 N_("GPG-sign commits"),
1485 PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
1486 OPT_BOOL(0, "autostash", &options.autostash,
1487 N_("automatically stash/stash pop before and after")),
1488 OPT_STRING_LIST('x', "exec", &exec, N_("exec"),
1489 N_("add exec lines after each commit of the "
1490 "editable list")),
1491 OPT_BOOL(0, "allow-empty-message",
1492 &options.allow_empty_message,
1493 N_("allow rebasing commits with empty messages")),
1494 {OPTION_STRING, 'r', "rebase-merges", &rebase_merges,
1495 N_("mode"),
1496 N_("try to rebase merges instead of skipping them"),
1497 PARSE_OPT_OPTARG, NULL, (intptr_t)""},
1498 OPT_BOOL(0, "fork-point", &fork_point,
1499 N_("use 'merge-base --fork-point' to refine upstream")),
1500 OPT_STRING('s', "strategy", &options.strategy,
1501 N_("strategy"), N_("use the given merge strategy")),
1502 OPT_STRING_LIST('X', "strategy-option", &strategy_options,
1503 N_("option"),
1504 N_("pass the argument through to the merge "
1505 "strategy")),
1506 OPT_BOOL(0, "root", &options.root,
1507 N_("rebase all reachable commits up to the root(s)")),
1508 OPT_BOOL(0, "reschedule-failed-exec",
1509 &reschedule_failed_exec,
1510 N_("automatically re-schedule any `exec` that fails")),
1511 OPT_END(),
1512 };
1513 int i;
1514
1515 if (argc == 2 && !strcmp(argv[1], "-h"))
1516 usage_with_options(builtin_rebase_usage,
1517 builtin_rebase_options);
1518
1519 options.allow_empty_message = 1;
1520 git_config(rebase_config, &options);
1521
1522 if (options.use_legacy_rebase ||
1523 !git_env_bool("GIT_TEST_REBASE_USE_BUILTIN", -1))
1524 warning(_("the rebase.useBuiltin support has been removed!\n"
1525 "See its entry in 'git help config' for details."));
1526
1527 strbuf_reset(&buf);
1528 strbuf_addf(&buf, "%s/applying", apply_dir());
1529 if(file_exists(buf.buf))
1530 die(_("It looks like 'git am' is in progress. Cannot rebase."));
1531
1532 if (is_directory(apply_dir())) {
1533 options.type = REBASE_AM;
1534 options.state_dir = apply_dir();
1535 } else if (is_directory(merge_dir())) {
1536 strbuf_reset(&buf);
1537 strbuf_addf(&buf, "%s/rewritten", merge_dir());
1538 if (is_directory(buf.buf)) {
1539 options.type = REBASE_PRESERVE_MERGES;
1540 options.flags |= REBASE_INTERACTIVE_EXPLICIT;
1541 } else {
1542 strbuf_reset(&buf);
1543 strbuf_addf(&buf, "%s/interactive", merge_dir());
1544 if(file_exists(buf.buf)) {
1545 options.type = REBASE_INTERACTIVE;
1546 options.flags |= REBASE_INTERACTIVE_EXPLICIT;
1547 } else
1548 options.type = REBASE_MERGE;
1549 }
1550 options.state_dir = merge_dir();
1551 }
1552
1553 if (options.type != REBASE_UNSPECIFIED)
1554 in_progress = 1;
1555
1556 total_argc = argc;
1557 argc = parse_options(argc, argv, prefix,
1558 builtin_rebase_options,
1559 builtin_rebase_usage, 0);
1560
1561 if (action != ACTION_NONE && total_argc != 2) {
1562 usage_with_options(builtin_rebase_usage,
1563 builtin_rebase_options);
1564 }
1565
1566 if (argc > 2)
1567 usage_with_options(builtin_rebase_usage,
1568 builtin_rebase_options);
1569
1570 if (options.type == REBASE_PRESERVE_MERGES)
1571 warning(_("git rebase --preserve-merges is deprecated. "
1572 "Use --rebase-merges instead."));
1573
1574 if (keep_base) {
1575 if (options.onto_name)
1576 die(_("cannot combine '--keep-base' with '--onto'"));
1577 if (options.root)
1578 die(_("cannot combine '--keep-base' with '--root'"));
1579 }
1580
1581 if (action != ACTION_NONE && !in_progress)
1582 die(_("No rebase in progress?"));
1583 setenv(GIT_REFLOG_ACTION_ENVIRONMENT, "rebase", 0);
1584
1585 if (action == ACTION_EDIT_TODO && !is_interactive(&options))
1586 die(_("The --edit-todo action can only be used during "
1587 "interactive rebase."));
1588
1589 if (trace2_is_enabled()) {
1590 if (is_interactive(&options))
1591 trace2_cmd_mode("interactive");
1592 else if (exec.nr)
1593 trace2_cmd_mode("interactive-exec");
1594 else
1595 trace2_cmd_mode(action_names[action]);
1596 }
1597
1598 switch (action) {
1599 case ACTION_CONTINUE: {
1600 struct object_id head;
1601 struct lock_file lock_file = LOCK_INIT;
1602 int fd;
1603
1604 options.action = "continue";
1605 set_reflog_action(&options);
1606
1607 /* Sanity check */
1608 if (get_oid("HEAD", &head))
1609 die(_("Cannot read HEAD"));
1610
1611 fd = hold_locked_index(&lock_file, 0);
1612 if (repo_read_index(the_repository) < 0)
1613 die(_("could not read index"));
1614 refresh_index(the_repository->index, REFRESH_QUIET, NULL, NULL,
1615 NULL);
1616 if (0 <= fd)
1617 repo_update_index_if_able(the_repository, &lock_file);
1618 rollback_lock_file(&lock_file);
1619
1620 if (has_unstaged_changes(the_repository, 1)) {
1621 puts(_("You must edit all merge conflicts and then\n"
1622 "mark them as resolved using git add"));
1623 exit(1);
1624 }
1625 if (read_basic_state(&options))
1626 exit(1);
1627 goto run_rebase;
1628 }
1629 case ACTION_SKIP: {
1630 struct string_list merge_rr = STRING_LIST_INIT_DUP;
1631
1632 options.action = "skip";
1633 set_reflog_action(&options);
1634
1635 rerere_clear(the_repository, &merge_rr);
1636 string_list_clear(&merge_rr, 1);
1637
1638 if (reset_head(NULL, "reset", NULL, RESET_HEAD_HARD,
1639 NULL, NULL) < 0)
1640 die(_("could not discard worktree changes"));
1641 remove_branch_state(the_repository, 0);
1642 if (read_basic_state(&options))
1643 exit(1);
1644 goto run_rebase;
1645 }
1646 case ACTION_ABORT: {
1647 struct string_list merge_rr = STRING_LIST_INIT_DUP;
1648 options.action = "abort";
1649 set_reflog_action(&options);
1650
1651 rerere_clear(the_repository, &merge_rr);
1652 string_list_clear(&merge_rr, 1);
1653
1654 if (read_basic_state(&options))
1655 exit(1);
1656 if (reset_head(&options.orig_head, "reset",
1657 options.head_name, RESET_HEAD_HARD,
1658 NULL, NULL) < 0)
1659 die(_("could not move back to %s"),
1660 oid_to_hex(&options.orig_head));
1661 remove_branch_state(the_repository, 0);
1662 ret = !!finish_rebase(&options);
1663 goto cleanup;
1664 }
1665 case ACTION_QUIT: {
1666 if (options.type == REBASE_INTERACTIVE) {
1667 struct replay_opts replay = REPLAY_OPTS_INIT;
1668
1669 replay.action = REPLAY_INTERACTIVE_REBASE;
1670 ret = !!sequencer_remove_state(&replay);
1671 } else {
1672 strbuf_reset(&buf);
1673 strbuf_addstr(&buf, options.state_dir);
1674 ret = !!remove_dir_recursively(&buf, 0);
1675 if (ret)
1676 error(_("could not remove '%s'"),
1677 options.state_dir);
1678 }
1679 goto cleanup;
1680 }
1681 case ACTION_EDIT_TODO:
1682 options.action = "edit-todo";
1683 options.dont_finish_rebase = 1;
1684 goto run_rebase;
1685 case ACTION_SHOW_CURRENT_PATCH:
1686 options.action = "show-current-patch";
1687 options.dont_finish_rebase = 1;
1688 goto run_rebase;
1689 case ACTION_NONE:
1690 break;
1691 default:
1692 BUG("action: %d", action);
1693 }
1694
1695 /* Make sure no rebase is in progress */
1696 if (in_progress) {
1697 const char *last_slash = strrchr(options.state_dir, '/');
1698 const char *state_dir_base =
1699 last_slash ? last_slash + 1 : options.state_dir;
1700 const char *cmd_live_rebase =
1701 "git rebase (--continue | --abort | --skip)";
1702 strbuf_reset(&buf);
1703 strbuf_addf(&buf, "rm -fr \"%s\"", options.state_dir);
1704 die(_("It seems that there is already a %s directory, and\n"
1705 "I wonder if you are in the middle of another rebase. "
1706 "If that is the\n"
1707 "case, please try\n\t%s\n"
1708 "If that is not the case, please\n\t%s\n"
1709 "and run me again. I am stopping in case you still "
1710 "have something\n"
1711 "valuable there.\n"),
1712 state_dir_base, cmd_live_rebase, buf.buf);
1713 }
1714
1715 for (i = 0; i < options.git_am_opts.argc; i++) {
1716 const char *option = options.git_am_opts.argv[i], *p;
1717 if (!strcmp(option, "--committer-date-is-author-date") ||
1718 !strcmp(option, "--ignore-date") ||
1719 !strcmp(option, "--whitespace=fix") ||
1720 !strcmp(option, "--whitespace=strip"))
1721 options.flags |= REBASE_FORCE;
1722 else if (skip_prefix(option, "-C", &p)) {
1723 while (*p)
1724 if (!isdigit(*(p++)))
1725 die(_("switch `C' expects a "
1726 "numerical value"));
1727 } else if (skip_prefix(option, "--whitespace=", &p)) {
1728 if (*p && strcmp(p, "warn") && strcmp(p, "nowarn") &&
1729 strcmp(p, "error") && strcmp(p, "error-all"))
1730 die("Invalid whitespace option: '%s'", p);
1731 }
1732 }
1733
1734 for (i = 0; i < exec.nr; i++)
1735 if (check_exec_cmd(exec.items[i].string))
1736 exit(1);
1737
1738 if (!(options.flags & REBASE_NO_QUIET))
1739 argv_array_push(&options.git_am_opts, "-q");
1740
1741 if (options.keep_empty)
1742 imply_interactive(&options, "--keep-empty");
1743
1744 if (gpg_sign) {
1745 free(options.gpg_sign_opt);
1746 options.gpg_sign_opt = xstrfmt("-S%s", gpg_sign);
1747 }
1748
1749 if (exec.nr) {
1750 int i;
1751
1752 imply_interactive(&options, "--exec");
1753
1754 strbuf_reset(&buf);
1755 for (i = 0; i < exec.nr; i++)
1756 strbuf_addf(&buf, "exec %s\n", exec.items[i].string);
1757 options.cmd = xstrdup(buf.buf);
1758 }
1759
1760 if (rebase_merges) {
1761 if (!*rebase_merges)
1762 ; /* default mode; do nothing */
1763 else if (!strcmp("rebase-cousins", rebase_merges))
1764 options.rebase_cousins = 1;
1765 else if (strcmp("no-rebase-cousins", rebase_merges))
1766 die(_("Unknown mode: %s"), rebase_merges);
1767 options.rebase_merges = 1;
1768 imply_interactive(&options, "--rebase-merges");
1769 }
1770
1771 if (strategy_options.nr) {
1772 int i;
1773
1774 if (!options.strategy)
1775 options.strategy = "recursive";
1776
1777 strbuf_reset(&buf);
1778 for (i = 0; i < strategy_options.nr; i++)
1779 strbuf_addf(&buf, " --%s",
1780 strategy_options.items[i].string);
1781 options.strategy_opts = xstrdup(buf.buf);
1782 }
1783
1784 if (options.strategy) {
1785 options.strategy = xstrdup(options.strategy);
1786 switch (options.type) {
1787 case REBASE_AM:
1788 die(_("--strategy requires --merge or --interactive"));
1789 case REBASE_MERGE:
1790 case REBASE_INTERACTIVE:
1791 case REBASE_PRESERVE_MERGES:
1792 /* compatible */
1793 break;
1794 case REBASE_UNSPECIFIED:
1795 options.type = REBASE_MERGE;
1796 break;
1797 default:
1798 BUG("unhandled rebase type (%d)", options.type);
1799 }
1800 }
1801
1802 if (options.type == REBASE_MERGE)
1803 imply_interactive(&options, "--merge");
1804
1805 if (options.root && !options.onto_name)
1806 imply_interactive(&options, "--root without --onto");
1807
1808 if (isatty(2) && options.flags & REBASE_NO_QUIET)
1809 strbuf_addstr(&options.git_format_patch_opt, " --progress");
1810
1811 switch (options.type) {
1812 case REBASE_MERGE:
1813 case REBASE_INTERACTIVE:
1814 case REBASE_PRESERVE_MERGES:
1815 options.state_dir = merge_dir();
1816 break;
1817 case REBASE_AM:
1818 options.state_dir = apply_dir();
1819 break;
1820 default:
1821 /* the default rebase backend is `--am` */
1822 options.type = REBASE_AM;
1823 options.state_dir = apply_dir();
1824 break;
1825 }
1826
1827 if (reschedule_failed_exec > 0 && !is_interactive(&options))
1828 die(_("--reschedule-failed-exec requires "
1829 "--exec or --interactive"));
1830 if (reschedule_failed_exec >= 0)
1831 options.reschedule_failed_exec = reschedule_failed_exec;
1832
1833 if (options.git_am_opts.argc) {
1834 /* all am options except -q are compatible only with --am */
1835 for (i = options.git_am_opts.argc - 1; i >= 0; i--)
1836 if (strcmp(options.git_am_opts.argv[i], "-q"))
1837 break;
1838
1839 if (is_interactive(&options) && i >= 0)
1840 die(_("cannot combine am options with either "
1841 "interactive or merge options"));
1842 }
1843
1844 if (options.signoff) {
1845 if (options.type == REBASE_PRESERVE_MERGES)
1846 die("cannot combine '--signoff' with "
1847 "'--preserve-merges'");
1848 argv_array_push(&options.git_am_opts, "--signoff");
1849 options.flags |= REBASE_FORCE;
1850 }
1851
1852 if (options.type == REBASE_PRESERVE_MERGES) {
1853 /*
1854 * Note: incompatibility with --signoff handled in signoff block above
1855 * Note: incompatibility with --interactive is just a strong warning;
1856 * git-rebase.txt caveats with "unless you know what you are doing"
1857 */
1858 if (options.rebase_merges)
1859 die(_("cannot combine '--preserve-merges' with "
1860 "'--rebase-merges'"));
1861
1862 if (options.reschedule_failed_exec)
1863 die(_("error: cannot combine '--preserve-merges' with "
1864 "'--reschedule-failed-exec'"));
1865 }
1866
1867 if (!options.root) {
1868 if (argc < 1) {
1869 struct branch *branch;
1870
1871 branch = branch_get(NULL);
1872 options.upstream_name = branch_get_upstream(branch,
1873 NULL);
1874 if (!options.upstream_name)
1875 error_on_missing_default_upstream();
1876 if (fork_point < 0)
1877 fork_point = 1;
1878 } else {
1879 options.upstream_name = argv[0];
1880 argc--;
1881 argv++;
1882 if (!strcmp(options.upstream_name, "-"))
1883 options.upstream_name = "@{-1}";
1884 }
1885 options.upstream = peel_committish(options.upstream_name);
1886 if (!options.upstream)
1887 die(_("invalid upstream '%s'"), options.upstream_name);
1888 options.upstream_arg = options.upstream_name;
1889 } else {
1890 if (!options.onto_name) {
1891 if (commit_tree("", 0, the_hash_algo->empty_tree, NULL,
1892 &squash_onto, NULL, NULL) < 0)
1893 die(_("Could not create new root commit"));
1894 options.squash_onto = &squash_onto;
1895 options.onto_name = squash_onto_name =
1896 xstrdup(oid_to_hex(&squash_onto));
1897 } else
1898 options.root_with_onto = 1;
1899
1900 options.upstream_name = NULL;
1901 options.upstream = NULL;
1902 if (argc > 1)
1903 usage_with_options(builtin_rebase_usage,
1904 builtin_rebase_options);
1905 options.upstream_arg = "--root";
1906 }
1907
1908 /* Make sure the branch to rebase onto is valid. */
1909 if (keep_base) {
1910 strbuf_reset(&buf);
1911 strbuf_addstr(&buf, options.upstream_name);
1912 strbuf_addstr(&buf, "...");
1913 options.onto_name = xstrdup(buf.buf);
1914 } else if (!options.onto_name)
1915 options.onto_name = options.upstream_name;
1916 if (strstr(options.onto_name, "...")) {
1917 if (get_oid_mb(options.onto_name, &merge_base) < 0) {
1918 if (keep_base)
1919 die(_("'%s': need exactly one merge base with branch"),
1920 options.upstream_name);
1921 else
1922 die(_("'%s': need exactly one merge base"),
1923 options.onto_name);
1924 }
1925 options.onto = lookup_commit_or_die(&merge_base,
1926 options.onto_name);
1927 } else {
1928 options.onto = peel_committish(options.onto_name);
1929 if (!options.onto)
1930 die(_("Does not point to a valid commit '%s'"),
1931 options.onto_name);
1932 }
1933
1934 /*
1935 * If the branch to rebase is given, that is the branch we will rebase
1936 * branch_name -- branch/commit being rebased, or
1937 * HEAD (already detached)
1938 * orig_head -- commit object name of tip of the branch before rebasing
1939 * head_name -- refs/heads/<that-branch> or NULL (detached HEAD)
1940 */
1941 if (argc == 1) {
1942 /* Is it "rebase other branchname" or "rebase other commit"? */
1943 branch_name = argv[0];
1944 options.switch_to = argv[0];
1945
1946 /* Is it a local branch? */
1947 strbuf_reset(&buf);
1948 strbuf_addf(&buf, "refs/heads/%s", branch_name);
1949 if (!read_ref(buf.buf, &options.orig_head))
1950 options.head_name = xstrdup(buf.buf);
1951 /* If not is it a valid ref (branch or commit)? */
1952 else if (!get_oid(branch_name, &options.orig_head))
1953 options.head_name = NULL;
1954 else
1955 die(_("fatal: no such branch/commit '%s'"),
1956 branch_name);
1957 } else if (argc == 0) {
1958 /* Do not need to switch branches, we are already on it. */
1959 options.head_name =
1960 xstrdup_or_null(resolve_ref_unsafe("HEAD", 0, NULL,
1961 &flags));
1962 if (!options.head_name)
1963 die(_("No such ref: %s"), "HEAD");
1964 if (flags & REF_ISSYMREF) {
1965 if (!skip_prefix(options.head_name,
1966 "refs/heads/", &branch_name))
1967 branch_name = options.head_name;
1968
1969 } else {
1970 FREE_AND_NULL(options.head_name);
1971 branch_name = "HEAD";
1972 }
1973 if (get_oid("HEAD", &options.orig_head))
1974 die(_("Could not resolve HEAD to a revision"));
1975 } else
1976 BUG("unexpected number of arguments left to parse");
1977
1978 if (fork_point > 0) {
1979 struct commit *head =
1980 lookup_commit_reference(the_repository,
1981 &options.orig_head);
1982 options.restrict_revision =
1983 get_fork_point(options.upstream_name, head);
1984 }
1985
1986 if (repo_read_index(the_repository) < 0)
1987 die(_("could not read index"));
1988
1989 if (options.autostash) {
1990 struct lock_file lock_file = LOCK_INIT;
1991 int fd;
1992
1993 fd = hold_locked_index(&lock_file, 0);
1994 refresh_cache(REFRESH_QUIET);
1995 if (0 <= fd)
1996 repo_update_index_if_able(the_repository, &lock_file);
1997 rollback_lock_file(&lock_file);
1998
1999 if (has_unstaged_changes(the_repository, 1) ||
2000 has_uncommitted_changes(the_repository, 1)) {
2001 const char *autostash =
2002 state_dir_path("autostash", &options);
2003 struct child_process stash = CHILD_PROCESS_INIT;
2004 struct object_id oid;
2005 struct commit *head =
2006 lookup_commit_reference(the_repository,
2007 &options.orig_head);
2008
2009 argv_array_pushl(&stash.args,
2010 "stash", "create", "autostash", NULL);
2011 stash.git_cmd = 1;
2012 stash.no_stdin = 1;
2013 strbuf_reset(&buf);
2014 if (capture_command(&stash, &buf, GIT_MAX_HEXSZ))
2015 die(_("Cannot autostash"));
2016 strbuf_trim_trailing_newline(&buf);
2017 if (get_oid(buf.buf, &oid))
2018 die(_("Unexpected stash response: '%s'"),
2019 buf.buf);
2020 strbuf_reset(&buf);
2021 strbuf_add_unique_abbrev(&buf, &oid, DEFAULT_ABBREV);
2022
2023 if (safe_create_leading_directories_const(autostash))
2024 die(_("Could not create directory for '%s'"),
2025 options.state_dir);
2026 write_file(autostash, "%s", oid_to_hex(&oid));
2027 printf(_("Created autostash: %s\n"), buf.buf);
2028 if (reset_head(&head->object.oid, "reset --hard",
2029 NULL, RESET_HEAD_HARD, NULL, NULL) < 0)
2030 die(_("could not reset --hard"));
2031 printf(_("HEAD is now at %s"),
2032 find_unique_abbrev(&head->object.oid,
2033 DEFAULT_ABBREV));
2034 strbuf_reset(&buf);
2035 pp_commit_easy(CMIT_FMT_ONELINE, head, &buf);
2036 if (buf.len > 0)
2037 printf(" %s", buf.buf);
2038 putchar('\n');
2039
2040 if (discard_index(the_repository->index) < 0 ||
2041 repo_read_index(the_repository) < 0)
2042 die(_("could not read index"));
2043 }
2044 }
2045
2046 if (require_clean_work_tree(the_repository, "rebase",
2047 _("Please commit or stash them."), 1, 1)) {
2048 ret = 1;
2049 goto cleanup;
2050 }
2051
2052 /*
2053 * Now we are rebasing commits upstream..orig_head (or with --root,
2054 * everything leading up to orig_head) on top of onto.
2055 */
2056
2057 /*
2058 * Check if we are already based on onto with linear history,
2059 * in which case we could fast-forward without replacing the commits
2060 * with new commits recreated by replaying their changes. This
2061 * optimization must not be done if this is an interactive rebase.
2062 */
2063 if (can_fast_forward(options.onto, options.upstream, options.restrict_revision,
2064 &options.orig_head, &merge_base) &&
2065 !is_interactive(&options)) {
2066 int flag;
2067
2068 if (!(options.flags & REBASE_FORCE)) {
2069 /* Lazily switch to the target branch if needed... */
2070 if (options.switch_to) {
2071 struct object_id oid;
2072
2073 if (get_oid(options.switch_to, &oid) < 0) {
2074 ret = !!error(_("could not parse '%s'"),
2075 options.switch_to);
2076 goto cleanup;
2077 }
2078
2079 strbuf_reset(&buf);
2080 strbuf_addf(&buf, "%s: checkout %s",
2081 getenv(GIT_REFLOG_ACTION_ENVIRONMENT),
2082 options.switch_to);
2083 if (reset_head(&oid, "checkout",
2084 options.head_name,
2085 RESET_HEAD_RUN_POST_CHECKOUT_HOOK,
2086 NULL, buf.buf) < 0) {
2087 ret = !!error(_("could not switch to "
2088 "%s"),
2089 options.switch_to);
2090 goto cleanup;
2091 }
2092 }
2093
2094 if (!(options.flags & REBASE_NO_QUIET))
2095 ; /* be quiet */
2096 else if (!strcmp(branch_name, "HEAD") &&
2097 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
2098 puts(_("HEAD is up to date."));
2099 else
2100 printf(_("Current branch %s is up to date.\n"),
2101 branch_name);
2102 ret = !!finish_rebase(&options);
2103 goto cleanup;
2104 } else if (!(options.flags & REBASE_NO_QUIET))
2105 ; /* be quiet */
2106 else if (!strcmp(branch_name, "HEAD") &&
2107 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
2108 puts(_("HEAD is up to date, rebase forced."));
2109 else
2110 printf(_("Current branch %s is up to date, rebase "
2111 "forced.\n"), branch_name);
2112 }
2113
2114 /* If a hook exists, give it a chance to interrupt*/
2115 if (!ok_to_skip_pre_rebase &&
2116 run_hook_le(NULL, "pre-rebase", options.upstream_arg,
2117 argc ? argv[0] : NULL, NULL))
2118 die(_("The pre-rebase hook refused to rebase."));
2119
2120 if (options.flags & REBASE_DIFFSTAT) {
2121 struct diff_options opts;
2122
2123 if (options.flags & REBASE_VERBOSE) {
2124 if (is_null_oid(&merge_base))
2125 printf(_("Changes to %s:\n"),
2126 oid_to_hex(&options.onto->object.oid));
2127 else
2128 printf(_("Changes from %s to %s:\n"),
2129 oid_to_hex(&merge_base),
2130 oid_to_hex(&options.onto->object.oid));
2131 }
2132
2133 /* We want color (if set), but no pager */
2134 diff_setup(&opts);
2135 opts.stat_width = -1; /* use full terminal width */
2136 opts.stat_graph_width = -1; /* respect statGraphWidth config */
2137 opts.output_format |=
2138 DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
2139 opts.detect_rename = DIFF_DETECT_RENAME;
2140 diff_setup_done(&opts);
2141 diff_tree_oid(is_null_oid(&merge_base) ?
2142 the_hash_algo->empty_tree : &merge_base,
2143 &options.onto->object.oid, "", &opts);
2144 diffcore_std(&opts);
2145 diff_flush(&opts);
2146 }
2147
2148 if (is_interactive(&options))
2149 goto run_rebase;
2150
2151 /* Detach HEAD and reset the tree */
2152 if (options.flags & REBASE_NO_QUIET)
2153 printf(_("First, rewinding head to replay your work on top of "
2154 "it...\n"));
2155
2156 strbuf_addf(&msg, "%s: checkout %s",
2157 getenv(GIT_REFLOG_ACTION_ENVIRONMENT), options.onto_name);
2158 if (reset_head(&options.onto->object.oid, "checkout", NULL,
2159 RESET_HEAD_DETACH | RESET_ORIG_HEAD |
2160 RESET_HEAD_RUN_POST_CHECKOUT_HOOK,
2161 NULL, msg.buf))
2162 die(_("Could not detach HEAD"));
2163 strbuf_release(&msg);
2164
2165 /*
2166 * If the onto is a proper descendant of the tip of the branch, then
2167 * we just fast-forwarded.
2168 */
2169 strbuf_reset(&msg);
2170 if (oideq(&merge_base, &options.orig_head)) {
2171 printf(_("Fast-forwarded %s to %s.\n"),
2172 branch_name, options.onto_name);
2173 strbuf_addf(&msg, "rebase finished: %s onto %s",
2174 options.head_name ? options.head_name : "detached HEAD",
2175 oid_to_hex(&options.onto->object.oid));
2176 reset_head(NULL, "Fast-forwarded", options.head_name,
2177 RESET_HEAD_REFS_ONLY, "HEAD", msg.buf);
2178 strbuf_release(&msg);
2179 ret = !!finish_rebase(&options);
2180 goto cleanup;
2181 }
2182
2183 strbuf_addf(&revisions, "%s..%s",
2184 options.root ? oid_to_hex(&options.onto->object.oid) :
2185 (options.restrict_revision ?
2186 oid_to_hex(&options.restrict_revision->object.oid) :
2187 oid_to_hex(&options.upstream->object.oid)),
2188 oid_to_hex(&options.orig_head));
2189
2190 options.revisions = revisions.buf;
2191
2192 run_rebase:
2193 ret = !!run_specific_rebase(&options, action);
2194
2195 cleanup:
2196 strbuf_release(&buf);
2197 strbuf_release(&revisions);
2198 free(options.head_name);
2199 free(options.gpg_sign_opt);
2200 free(options.cmd);
2201 free(squash_onto_name);
2202 return ret;
2203 }