builtin rebase: support `--allow-empty-message` option
[git/git.git] / builtin / rebase.c
CommitLineData
55071ea2
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1/*
2 * "git rebase" builtin command
3 *
4 * Copyright (c) 2018 Pratik Karki
5 */
6
7#include "builtin.h"
8#include "run-command.h"
9#include "exec-cmd.h"
10#include "argv-array.h"
11#include "dir.h"
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12#include "packfile.h"
13#include "refs.h"
14#include "quote.h"
15#include "config.h"
16#include "cache-tree.h"
17#include "unpack-trees.h"
18#include "lockfile.h"
f28d40d3 19#include "parse-options.h"
075bc852 20#include "commit.h"
bff014da 21#include "diff.h"
e0333e5c 22#include "wt-status.h"
9a48a615 23#include "revision.h"
122420c2 24#include "rerere.h"
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25
26static char const * const builtin_rebase_usage[] = {
27 N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] "
28 "[<upstream>] [<branch>]"),
29 N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] "
30 "--root [<branch>]"),
31 N_("git rebase --continue | --abort | --skip | --edit-todo"),
32 NULL
33};
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34
35static GIT_PATH_FUNC(apply_dir, "rebase-apply")
36static GIT_PATH_FUNC(merge_dir, "rebase-merge")
37
38enum rebase_type {
39 REBASE_UNSPECIFIED = -1,
40 REBASE_AM,
41 REBASE_MERGE,
42 REBASE_INTERACTIVE,
43 REBASE_PRESERVE_MERGES
44};
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45
46static int use_builtin_rebase(void)
47{
48 struct child_process cp = CHILD_PROCESS_INIT;
49 struct strbuf out = STRBUF_INIT;
50 int ret;
51
52 argv_array_pushl(&cp.args,
53 "config", "--bool", "rebase.usebuiltin", NULL);
54 cp.git_cmd = 1;
55 if (capture_command(&cp, &out, 6)) {
56 strbuf_release(&out);
57 return 0;
58 }
59
60 strbuf_trim(&out);
61 ret = !strcmp("true", out.buf);
62 strbuf_release(&out);
63 return ret;
64}
65
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66struct rebase_options {
67 enum rebase_type type;
68 const char *state_dir;
69 struct commit *upstream;
70 const char *upstream_name;
06e4775a 71 const char *upstream_arg;
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72 char *head_name;
73 struct object_id orig_head;
74 struct commit *onto;
75 const char *onto_name;
76 const char *revisions;
e65123a7 77 const char *switch_to;
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78 int root;
79 struct commit *restrict_revision;
80 int dont_finish_rebase;
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81 enum {
82 REBASE_NO_QUIET = 1<<0,
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83 REBASE_VERBOSE = 1<<1,
84 REBASE_DIFFSTAT = 1<<2,
1ed9c14f 85 REBASE_FORCE = 1<<3,
c54dacb5 86 REBASE_INTERACTIVE_EXPLICIT = 1<<4,
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87 } flags;
88 struct strbuf git_am_opt;
f9573628 89 const char *action;
73d51ed0 90 int signoff;
ead98c11 91 int allow_rerere_autoupdate;
002ee2fe 92 int keep_empty;
051910a9 93 int autosquash;
12026a41 94 char *gpg_sign_opt;
6defce2b 95 int autostash;
68e46d78 96 char *cmd;
9b3a448b 97 int allow_empty_message;
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98};
99
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100static int is_interactive(struct rebase_options *opts)
101{
102 return opts->type == REBASE_INTERACTIVE ||
103 opts->type == REBASE_PRESERVE_MERGES;
104}
105
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106static void imply_interactive(struct rebase_options *opts, const char *option)
107{
108 switch (opts->type) {
109 case REBASE_AM:
110 die(_("%s requires an interactive rebase"), option);
111 break;
112 case REBASE_INTERACTIVE:
113 case REBASE_PRESERVE_MERGES:
114 break;
115 case REBASE_MERGE:
116 /* we silently *upgrade* --merge to --interactive if needed */
117 default:
118 opts->type = REBASE_INTERACTIVE; /* implied */
119 break;
120 }
121}
122
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123/* Returns the filename prefixed by the state_dir */
124static const char *state_dir_path(const char *filename, struct rebase_options *opts)
125{
126 static struct strbuf path = STRBUF_INIT;
127 static size_t prefix_len;
128
129 if (!prefix_len) {
130 strbuf_addf(&path, "%s/", opts->state_dir);
131 prefix_len = path.len;
132 }
133
134 strbuf_setlen(&path, prefix_len);
135 strbuf_addstr(&path, filename);
136 return path.buf;
137}
138
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139/* Read one file, then strip line endings */
140static int read_one(const char *path, struct strbuf *buf)
141{
142 if (strbuf_read_file(buf, path, 0) < 0)
143 return error_errno(_("could not read '%s'"), path);
144 strbuf_trim_trailing_newline(buf);
145 return 0;
146}
147
148/* Initialize the rebase options from the state directory. */
149static int read_basic_state(struct rebase_options *opts)
150{
151 struct strbuf head_name = STRBUF_INIT;
152 struct strbuf buf = STRBUF_INIT;
153 struct object_id oid;
154
155 if (read_one(state_dir_path("head-name", opts), &head_name) ||
156 read_one(state_dir_path("onto", opts), &buf))
157 return -1;
158 opts->head_name = starts_with(head_name.buf, "refs/") ?
159 xstrdup(head_name.buf) : NULL;
160 strbuf_release(&head_name);
161 if (get_oid(buf.buf, &oid))
162 return error(_("could not get 'onto': '%s'"), buf.buf);
163 opts->onto = lookup_commit_or_die(&oid, buf.buf);
164
165 /*
166 * We always write to orig-head, but interactive rebase used to write to
167 * head. Fall back to reading from head to cover for the case that the
168 * user upgraded git with an ongoing interactive rebase.
169 */
170 strbuf_reset(&buf);
171 if (file_exists(state_dir_path("orig-head", opts))) {
172 if (read_one(state_dir_path("orig-head", opts), &buf))
173 return -1;
174 } else if (read_one(state_dir_path("head", opts), &buf))
175 return -1;
176 if (get_oid(buf.buf, &opts->orig_head))
177 return error(_("invalid orig-head: '%s'"), buf.buf);
178
179 strbuf_reset(&buf);
180 if (read_one(state_dir_path("quiet", opts), &buf))
181 return -1;
182 if (buf.len)
183 opts->flags &= ~REBASE_NO_QUIET;
184 else
185 opts->flags |= REBASE_NO_QUIET;
186
187 if (file_exists(state_dir_path("verbose", opts)))
188 opts->flags |= REBASE_VERBOSE;
189
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190 if (file_exists(state_dir_path("signoff", opts))) {
191 opts->signoff = 1;
192 opts->flags |= REBASE_FORCE;
193 }
194
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195 if (file_exists(state_dir_path("allow_rerere_autoupdate", opts))) {
196 strbuf_reset(&buf);
197 if (read_one(state_dir_path("allow_rerere_autoupdate", opts),
198 &buf))
199 return -1;
200 if (!strcmp(buf.buf, "--rerere-autoupdate"))
201 opts->allow_rerere_autoupdate = 1;
202 else if (!strcmp(buf.buf, "--no-rerere-autoupdate"))
203 opts->allow_rerere_autoupdate = 0;
204 else
205 warning(_("ignoring invalid allow_rerere_autoupdate: "
206 "'%s'"), buf.buf);
207 } else
208 opts->allow_rerere_autoupdate = -1;
209
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210 if (file_exists(state_dir_path("gpg_sign_opt", opts))) {
211 strbuf_reset(&buf);
212 if (read_one(state_dir_path("gpg_sign_opt", opts),
213 &buf))
214 return -1;
215 free(opts->gpg_sign_opt);
216 opts->gpg_sign_opt = xstrdup(buf.buf);
217 }
218
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219 strbuf_release(&buf);
220
221 return 0;
222}
223
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224static int apply_autostash(struct rebase_options *opts)
225{
226 const char *path = state_dir_path("autostash", opts);
227 struct strbuf autostash = STRBUF_INIT;
228 struct child_process stash_apply = CHILD_PROCESS_INIT;
229
230 if (!file_exists(path))
231 return 0;
232
233 if (read_one(state_dir_path("autostash", opts), &autostash))
234 return error(_("Could not read '%s'"), path);
235 argv_array_pushl(&stash_apply.args,
236 "stash", "apply", autostash.buf, NULL);
237 stash_apply.git_cmd = 1;
238 stash_apply.no_stderr = stash_apply.no_stdout =
239 stash_apply.no_stdin = 1;
240 if (!run_command(&stash_apply))
241 printf(_("Applied autostash.\n"));
242 else {
243 struct argv_array args = ARGV_ARRAY_INIT;
244 int res = 0;
245
246 argv_array_pushl(&args,
247 "stash", "store", "-m", "autostash", "-q",
248 autostash.buf, NULL);
249 if (run_command_v_opt(args.argv, RUN_GIT_CMD))
250 res = error(_("Cannot store %s"), autostash.buf);
251 argv_array_clear(&args);
252 strbuf_release(&autostash);
253 if (res)
254 return res;
255
256 fprintf(stderr,
257 _("Applying autostash resulted in conflicts.\n"
258 "Your changes are safe in the stash.\n"
259 "You can run \"git stash pop\" or \"git stash drop\" "
260 "at any time.\n"));
261 }
262
263 strbuf_release(&autostash);
264 return 0;
265}
266
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267static int finish_rebase(struct rebase_options *opts)
268{
269 struct strbuf dir = STRBUF_INIT;
270 const char *argv_gc_auto[] = { "gc", "--auto", NULL };
271
272 delete_ref(NULL, "REBASE_HEAD", NULL, REF_NO_DEREF);
6defce2b 273 apply_autostash(opts);
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274 close_all_packs(the_repository->objects);
275 /*
276 * We ignore errors in 'gc --auto', since the
277 * user should see them.
278 */
279 run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
280 strbuf_addstr(&dir, opts->state_dir);
281 remove_dir_recursively(&dir, 0);
282 strbuf_release(&dir);
283
284 return 0;
285}
286
287static struct commit *peel_committish(const char *name)
288{
289 struct object *obj;
290 struct object_id oid;
291
292 if (get_oid(name, &oid))
293 return NULL;
294 obj = parse_object(the_repository, &oid);
295 return (struct commit *)peel_to_type(name, 0, obj, OBJ_COMMIT);
296}
297
298static void add_var(struct strbuf *buf, const char *name, const char *value)
299{
300 if (!value)
301 strbuf_addf(buf, "unset %s; ", name);
302 else {
303 strbuf_addf(buf, "%s=", name);
304 sq_quote_buf(buf, value);
305 strbuf_addstr(buf, "; ");
306 }
307}
308
309static int run_specific_rebase(struct rebase_options *opts)
310{
311 const char *argv[] = { NULL, NULL };
312 struct strbuf script_snippet = STRBUF_INIT;
313 int status;
314 const char *backend, *backend_func;
315
316 add_var(&script_snippet, "GIT_DIR", absolute_path(get_git_dir()));
317 add_var(&script_snippet, "state_dir", opts->state_dir);
318
319 add_var(&script_snippet, "upstream_name", opts->upstream_name);
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320 add_var(&script_snippet, "upstream", opts->upstream ?
321 oid_to_hex(&opts->upstream->object.oid) : NULL);
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322 add_var(&script_snippet, "head_name",
323 opts->head_name ? opts->head_name : "detached HEAD");
ac7f467f 324 add_var(&script_snippet, "orig_head", oid_to_hex(&opts->orig_head));
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325 add_var(&script_snippet, "onto", opts->onto ?
326 oid_to_hex(&opts->onto->object.oid) : NULL);
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327 add_var(&script_snippet, "onto_name", opts->onto_name);
328 add_var(&script_snippet, "revisions", opts->revisions);
329 add_var(&script_snippet, "restrict_revision", opts->restrict_revision ?
330 oid_to_hex(&opts->restrict_revision->object.oid) : NULL);
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331 add_var(&script_snippet, "GIT_QUIET",
332 opts->flags & REBASE_NO_QUIET ? "" : "t");
333 add_var(&script_snippet, "git_am_opt", opts->git_am_opt.buf);
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334 add_var(&script_snippet, "verbose",
335 opts->flags & REBASE_VERBOSE ? "t" : "");
336 add_var(&script_snippet, "diffstat",
337 opts->flags & REBASE_DIFFSTAT ? "t" : "");
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338 add_var(&script_snippet, "force_rebase",
339 opts->flags & REBASE_FORCE ? "t" : "");
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340 if (opts->switch_to)
341 add_var(&script_snippet, "switch_to", opts->switch_to);
f9573628 342 add_var(&script_snippet, "action", opts->action ? opts->action : "");
73d51ed0 343 add_var(&script_snippet, "signoff", opts->signoff ? "--signoff" : "");
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344 add_var(&script_snippet, "allow_rerere_autoupdate",
345 opts->allow_rerere_autoupdate < 0 ? "" :
346 opts->allow_rerere_autoupdate ?
347 "--rerere-autoupdate" : "--no-rerere-autoupdate");
002ee2fe 348 add_var(&script_snippet, "keep_empty", opts->keep_empty ? "yes" : "");
051910a9 349 add_var(&script_snippet, "autosquash", opts->autosquash ? "t" : "");
12026a41 350 add_var(&script_snippet, "gpg_sign_opt", opts->gpg_sign_opt);
68e46d78 351 add_var(&script_snippet, "cmd", opts->cmd);
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352 add_var(&script_snippet, "allow_empty_message",
353 opts->allow_empty_message ? "--allow-empty-message" : "");
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354
355 switch (opts->type) {
356 case REBASE_AM:
357 backend = "git-rebase--am";
358 backend_func = "git_rebase__am";
359 break;
360 case REBASE_INTERACTIVE:
361 backend = "git-rebase--interactive";
362 backend_func = "git_rebase__interactive";
363 break;
364 case REBASE_MERGE:
365 backend = "git-rebase--merge";
366 backend_func = "git_rebase__merge";
367 break;
368 case REBASE_PRESERVE_MERGES:
369 backend = "git-rebase--preserve-merges";
370 backend_func = "git_rebase__preserve_merges";
371 break;
372 default:
373 BUG("Unhandled rebase type %d", opts->type);
374 break;
375 }
376
377 strbuf_addf(&script_snippet,
378 ". git-sh-setup && . git-rebase--common &&"
379 " . %s && %s", backend, backend_func);
380 argv[0] = script_snippet.buf;
381
382 status = run_command_v_opt(argv, RUN_USING_SHELL);
383 if (opts->dont_finish_rebase)
384 ; /* do nothing */
385 else if (status == 0) {
386 if (!file_exists(state_dir_path("stopped-sha", opts)))
387 finish_rebase(opts);
388 } else if (status == 2) {
389 struct strbuf dir = STRBUF_INIT;
390
6defce2b 391 apply_autostash(opts);
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392 strbuf_addstr(&dir, opts->state_dir);
393 remove_dir_recursively(&dir, 0);
394 strbuf_release(&dir);
395 die("Nothing to do");
396 }
397
398 strbuf_release(&script_snippet);
399
400 return status ? -1 : 0;
401}
402
403#define GIT_REFLOG_ACTION_ENVIRONMENT "GIT_REFLOG_ACTION"
404
405static int reset_head(struct object_id *oid, const char *action,
406 const char *switch_to_branch, int detach_head)
407{
408 struct object_id head_oid;
409 struct tree_desc desc;
410 struct lock_file lock = LOCK_INIT;
411 struct unpack_trees_options unpack_tree_opts;
412 struct tree *tree;
413 const char *reflog_action;
414 struct strbuf msg = STRBUF_INIT;
415 size_t prefix_len;
416 struct object_id *orig = NULL, oid_orig,
417 *old_orig = NULL, oid_old_orig;
418 int ret = 0;
419
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420 if (switch_to_branch && !starts_with(switch_to_branch, "refs/"))
421 BUG("Not a fully qualified branch: '%s'", switch_to_branch);
422
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423 if (hold_locked_index(&lock, LOCK_REPORT_ON_ERROR) < 0)
424 return -1;
425
426 if (!oid) {
427 if (get_oid("HEAD", &head_oid)) {
428 rollback_lock_file(&lock);
429 return error(_("could not determine HEAD revision"));
430 }
431 oid = &head_oid;
432 }
433
434 memset(&unpack_tree_opts, 0, sizeof(unpack_tree_opts));
435 setup_unpack_trees_porcelain(&unpack_tree_opts, action);
436 unpack_tree_opts.head_idx = 1;
437 unpack_tree_opts.src_index = the_repository->index;
438 unpack_tree_opts.dst_index = the_repository->index;
439 unpack_tree_opts.fn = oneway_merge;
440 unpack_tree_opts.update = 1;
441 unpack_tree_opts.merge = 1;
442 if (!detach_head)
443 unpack_tree_opts.reset = 1;
444
445 if (read_index_unmerged(the_repository->index) < 0) {
446 rollback_lock_file(&lock);
447 return error(_("could not read index"));
448 }
449
450 if (!fill_tree_descriptor(&desc, oid)) {
451 error(_("failed to find tree of %s"), oid_to_hex(oid));
452 rollback_lock_file(&lock);
453 free((void *)desc.buffer);
454 return -1;
455 }
456
457 if (unpack_trees(1, &desc, &unpack_tree_opts)) {
458 rollback_lock_file(&lock);
459 free((void *)desc.buffer);
460 return -1;
461 }
462
463 tree = parse_tree_indirect(oid);
464 prime_cache_tree(the_repository->index, tree);
465
466 if (write_locked_index(the_repository->index, &lock, COMMIT_LOCK) < 0)
467 ret = error(_("could not write index"));
468 free((void *)desc.buffer);
469
470 if (ret)
471 return ret;
472
473 reflog_action = getenv(GIT_REFLOG_ACTION_ENVIRONMENT);
474 strbuf_addf(&msg, "%s: ", reflog_action ? reflog_action : "rebase");
475 prefix_len = msg.len;
476
477 if (!get_oid("ORIG_HEAD", &oid_old_orig))
478 old_orig = &oid_old_orig;
479 if (!get_oid("HEAD", &oid_orig)) {
480 orig = &oid_orig;
481 strbuf_addstr(&msg, "updating ORIG_HEAD");
482 update_ref(msg.buf, "ORIG_HEAD", orig, old_orig, 0,
483 UPDATE_REFS_MSG_ON_ERR);
484 } else if (old_orig)
485 delete_ref(NULL, "ORIG_HEAD", old_orig, 0);
486 strbuf_setlen(&msg, prefix_len);
487 strbuf_addstr(&msg, "updating HEAD");
488 if (!switch_to_branch)
489 ret = update_ref(msg.buf, "HEAD", oid, orig, REF_NO_DEREF,
490 UPDATE_REFS_MSG_ON_ERR);
491 else {
492 ret = create_symref("HEAD", switch_to_branch, msg.buf);
493 if (!ret)
494 ret = update_ref(msg.buf, "HEAD", oid, NULL, 0,
495 UPDATE_REFS_MSG_ON_ERR);
496 }
497
498 strbuf_release(&msg);
499 return ret;
500}
501
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502static int rebase_config(const char *var, const char *value, void *data)
503{
504 struct rebase_options *opts = data;
505
506 if (!strcmp(var, "rebase.stat")) {
507 if (git_config_bool(var, value))
508 opts->flags |= REBASE_DIFFSTAT;
509 else
510 opts->flags &= !REBASE_DIFFSTAT;
511 return 0;
512 }
513
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514 if (!strcmp(var, "rebase.autosquash")) {
515 opts->autosquash = git_config_bool(var, value);
516 return 0;
517 }
518
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519 if (!strcmp(var, "commit.gpgsign")) {
520 free(opts->gpg_sign_opt);
521 opts->gpg_sign_opt = git_config_bool(var, value) ?
522 xstrdup("-S") : NULL;
523 return 0;
524 }
525
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526 if (!strcmp(var, "rebase.autostash")) {
527 opts->autostash = git_config_bool(var, value);
528 return 0;
529 }
530
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531 return git_default_config(var, value, data);
532}
533
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534/*
535 * Determines whether the commits in from..to are linear, i.e. contain
536 * no merge commits. This function *expects* `from` to be an ancestor of
537 * `to`.
538 */
539static int is_linear_history(struct commit *from, struct commit *to)
540{
541 while (to && to != from) {
542 parse_commit(to);
543 if (!to->parents)
544 return 1;
545 if (to->parents->next)
546 return 0;
547 to = to->parents->item;
548 }
549 return 1;
550}
551
552static int can_fast_forward(struct commit *onto, struct object_id *head_oid,
553 struct object_id *merge_base)
554{
555 struct commit *head = lookup_commit(the_repository, head_oid);
556 struct commit_list *merge_bases;
557 int res;
558
559 if (!head)
560 return 0;
561
562 merge_bases = get_merge_bases(onto, head);
563 if (merge_bases && !merge_bases->next) {
564 oidcpy(merge_base, &merge_bases->item->object.oid);
565 res = !oidcmp(merge_base, &onto->object.oid);
566 } else {
567 oidcpy(merge_base, &null_oid);
568 res = 0;
569 }
570 free_commit_list(merge_bases);
571 return res && is_linear_history(onto, head);
572}
573
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574/* -i followed by -m is still -i */
575static int parse_opt_merge(const struct option *opt, const char *arg, int unset)
576{
577 struct rebase_options *opts = opt->value;
578
579 if (!is_interactive(opts))
580 opts->type = REBASE_MERGE;
581
582 return 0;
583}
584
585/* -i followed by -p is still explicitly interactive, but -p alone is not */
586static int parse_opt_interactive(const struct option *opt, const char *arg,
587 int unset)
588{
589 struct rebase_options *opts = opt->value;
590
591 opts->type = REBASE_INTERACTIVE;
592 opts->flags |= REBASE_INTERACTIVE_EXPLICIT;
593
594 return 0;
595}
596
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597int cmd_rebase(int argc, const char **argv, const char *prefix)
598{
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599 struct rebase_options options = {
600 .type = REBASE_UNSPECIFIED,
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601 .flags = REBASE_NO_QUIET,
602 .git_am_opt = STRBUF_INIT,
ead98c11 603 .allow_rerere_autoupdate = -1,
9b3a448b 604 .allow_empty_message = 1,
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605 };
606 const char *branch_name;
f9573628 607 int ret, flags, total_argc, in_progress = 0;
06e4775a 608 int ok_to_skip_pre_rebase = 0;
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609 struct strbuf msg = STRBUF_INIT;
610 struct strbuf revisions = STRBUF_INIT;
c54dacb5 611 struct strbuf buf = STRBUF_INIT;
075bc852 612 struct object_id merge_base;
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613 enum {
614 NO_ACTION,
615 ACTION_CONTINUE,
122420c2 616 ACTION_SKIP,
5e5d9619 617 ACTION_ABORT,
5a614945 618 ACTION_QUIT,
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619 ACTION_EDIT_TODO,
620 ACTION_SHOW_CURRENT_PATCH,
f9573628 621 } action = NO_ACTION;
38dbcef2 622 int committer_date_is_author_date = 0;
53f9e5be 623 int ignore_date = 0;
99d8cc7c 624 int ignore_whitespace = 0;
12026a41 625 const char *gpg_sign = NULL;
7998dbe1
PK
626 int opt_c = -1;
627 struct string_list whitespace = STRING_LIST_INIT_NODUP;
68e46d78 628 struct string_list exec = STRING_LIST_INIT_NODUP;
f28d40d3
PK
629 struct option builtin_rebase_options[] = {
630 OPT_STRING(0, "onto", &options.onto_name,
631 N_("revision"),
632 N_("rebase onto given branch instead of upstream")),
06e4775a
PK
633 OPT_BOOL(0, "no-verify", &ok_to_skip_pre_rebase,
634 N_("allow pre-rebase hook to run")),
b4c8eb02
PK
635 OPT_NEGBIT('q', "quiet", &options.flags,
636 N_("be quiet. implies --no-stat"),
bff014da
PK
637 REBASE_NO_QUIET| REBASE_VERBOSE | REBASE_DIFFSTAT),
638 OPT_BIT('v', "verbose", &options.flags,
639 N_("display a diffstat of what changed upstream"),
640 REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT),
641 {OPTION_NEGBIT, 'n', "no-stat", &options.flags, NULL,
642 N_("do not show diffstat of what changed upstream"),
643 PARSE_OPT_NOARG, NULL, REBASE_DIFFSTAT },
99d8cc7c
PK
644 OPT_BOOL(0, "ignore-whitespace", &ignore_whitespace,
645 N_("passed to 'git apply'")),
73d51ed0
PK
646 OPT_BOOL(0, "signoff", &options.signoff,
647 N_("add a Signed-off-by: line to each commit")),
38dbcef2
PK
648 OPT_BOOL(0, "committer-date-is-author-date",
649 &committer_date_is_author_date,
650 N_("passed to 'git am'")),
53f9e5be
PK
651 OPT_BOOL(0, "ignore-date", &ignore_date,
652 N_("passed to 'git am'")),
1ed9c14f
PK
653 OPT_BIT('f', "force-rebase", &options.flags,
654 N_("cherry-pick all commits, even if unchanged"),
655 REBASE_FORCE),
656 OPT_BIT(0, "no-ff", &options.flags,
657 N_("cherry-pick all commits, even if unchanged"),
658 REBASE_FORCE),
f9573628
PK
659 OPT_CMDMODE(0, "continue", &action, N_("continue"),
660 ACTION_CONTINUE),
122420c2
PK
661 OPT_CMDMODE(0, "skip", &action,
662 N_("skip current patch and continue"), ACTION_SKIP),
5e5d9619
PK
663 OPT_CMDMODE(0, "abort", &action,
664 N_("abort and check out the original branch"),
665 ACTION_ABORT),
5a614945
PK
666 OPT_CMDMODE(0, "quit", &action,
667 N_("abort but keep HEAD where it is"), ACTION_QUIT),
51e9ea6d
PK
668 OPT_CMDMODE(0, "edit-todo", &action, N_("edit the todo list "
669 "during an interactive rebase"), ACTION_EDIT_TODO),
670 OPT_CMDMODE(0, "show-current-patch", &action,
671 N_("show the patch file being applied or merged"),
672 ACTION_SHOW_CURRENT_PATCH),
361badd3
PK
673 { OPTION_CALLBACK, 'm', "merge", &options, NULL,
674 N_("use merging strategies to rebase"),
675 PARSE_OPT_NOARG | PARSE_OPT_NONEG,
676 parse_opt_merge },
677 { OPTION_CALLBACK, 'i', "interactive", &options, NULL,
678 N_("let the user edit the list of commits to rebase"),
679 PARSE_OPT_NOARG | PARSE_OPT_NONEG,
680 parse_opt_interactive },
681 OPT_SET_INT('p', "preserve-merges", &options.type,
682 N_("try to recreate merges instead of ignoring "
683 "them"), REBASE_PRESERVE_MERGES),
ead98c11
PK
684 OPT_BOOL(0, "rerere-autoupdate",
685 &options.allow_rerere_autoupdate,
686 N_("allow rerere to update index with resolved "
687 "conflict")),
002ee2fe
PK
688 OPT_BOOL('k', "keep-empty", &options.keep_empty,
689 N_("preserve empty commits during rebase")),
051910a9
PK
690 OPT_BOOL(0, "autosquash", &options.autosquash,
691 N_("move commits that begin with "
692 "squash!/fixup! under -i")),
12026a41
PK
693 { OPTION_STRING, 'S', "gpg-sign", &gpg_sign, N_("key-id"),
694 N_("GPG-sign commits"),
695 PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
7998dbe1
PK
696 OPT_STRING_LIST(0, "whitespace", &whitespace,
697 N_("whitespace"), N_("passed to 'git apply'")),
698 OPT_SET_INT('C', NULL, &opt_c, N_("passed to 'git apply'"),
699 REBASE_AM),
6defce2b
PK
700 OPT_BOOL(0, "autostash", &options.autostash,
701 N_("automatically stash/stash pop before and after")),
68e46d78
PK
702 OPT_STRING_LIST('x', "exec", &exec, N_("exec"),
703 N_("add exec lines after each commit of the "
704 "editable list")),
9b3a448b
PK
705 OPT_BOOL(0, "allow-empty-message",
706 &options.allow_empty_message,
707 N_("allow rebasing commits with empty messages")),
f28d40d3
PK
708 OPT_END(),
709 };
ac7f467f 710
55071ea2
PK
711 /*
712 * NEEDSWORK: Once the builtin rebase has been tested enough
713 * and git-legacy-rebase.sh is retired to contrib/, this preamble
714 * can be removed.
715 */
716
717 if (!use_builtin_rebase()) {
718 const char *path = mkpath("%s/git-legacy-rebase",
719 git_exec_path());
720
721 if (sane_execvp(path, (char **)argv) < 0)
722 die_errno(_("could not exec %s"), path);
723 else
724 BUG("sane_execvp() returned???");
725 }
726
f28d40d3
PK
727 if (argc == 2 && !strcmp(argv[1], "-h"))
728 usage_with_options(builtin_rebase_usage,
729 builtin_rebase_options);
730
55071ea2
PK
731 prefix = setup_git_directory();
732 trace_repo_setup(prefix);
733 setup_work_tree();
734
bff014da
PK
735 git_config(rebase_config, &options);
736
0eabf4b9
PK
737 strbuf_reset(&buf);
738 strbuf_addf(&buf, "%s/applying", apply_dir());
739 if(file_exists(buf.buf))
740 die(_("It looks like 'git am' is in progress. Cannot rebase."));
741
c54dacb5
PK
742 if (is_directory(apply_dir())) {
743 options.type = REBASE_AM;
744 options.state_dir = apply_dir();
745 } else if (is_directory(merge_dir())) {
746 strbuf_reset(&buf);
747 strbuf_addf(&buf, "%s/rewritten", merge_dir());
748 if (is_directory(buf.buf)) {
749 options.type = REBASE_PRESERVE_MERGES;
750 options.flags |= REBASE_INTERACTIVE_EXPLICIT;
751 } else {
752 strbuf_reset(&buf);
753 strbuf_addf(&buf, "%s/interactive", merge_dir());
754 if(file_exists(buf.buf)) {
755 options.type = REBASE_INTERACTIVE;
756 options.flags |= REBASE_INTERACTIVE_EXPLICIT;
757 } else
758 options.type = REBASE_MERGE;
759 }
760 options.state_dir = merge_dir();
761 }
762
763 if (options.type != REBASE_UNSPECIFIED)
764 in_progress = 1;
765
f9573628 766 total_argc = argc;
f28d40d3
PK
767 argc = parse_options(argc, argv, prefix,
768 builtin_rebase_options,
769 builtin_rebase_usage, 0);
770
f9573628
PK
771 if (action != NO_ACTION && total_argc != 2) {
772 usage_with_options(builtin_rebase_usage,
773 builtin_rebase_options);
774 }
775
f28d40d3
PK
776 if (argc > 2)
777 usage_with_options(builtin_rebase_usage,
778 builtin_rebase_options);
ac7f467f 779
d732a570
PK
780 if (action != NO_ACTION && !in_progress)
781 die(_("No rebase in progress?"));
782
51e9ea6d
PK
783 if (action == ACTION_EDIT_TODO && !is_interactive(&options))
784 die(_("The --edit-todo action can only be used during "
785 "interactive rebase."));
786
f9573628
PK
787 switch (action) {
788 case ACTION_CONTINUE: {
789 struct object_id head;
790 struct lock_file lock_file = LOCK_INIT;
791 int fd;
792
793 options.action = "continue";
794
795 /* Sanity check */
796 if (get_oid("HEAD", &head))
797 die(_("Cannot read HEAD"));
798
799 fd = hold_locked_index(&lock_file, 0);
800 if (read_index(the_repository->index) < 0)
801 die(_("could not read index"));
802 refresh_index(the_repository->index, REFRESH_QUIET, NULL, NULL,
803 NULL);
804 if (0 <= fd)
805 update_index_if_able(the_repository->index,
806 &lock_file);
807 rollback_lock_file(&lock_file);
808
809 if (has_unstaged_changes(1)) {
810 puts(_("You must edit all merge conflicts and then\n"
811 "mark them as resolved using git add"));
812 exit(1);
813 }
814 if (read_basic_state(&options))
815 exit(1);
816 goto run_rebase;
817 }
122420c2
PK
818 case ACTION_SKIP: {
819 struct string_list merge_rr = STRING_LIST_INIT_DUP;
820
821 options.action = "skip";
822
823 rerere_clear(&merge_rr);
824 string_list_clear(&merge_rr, 1);
825
826 if (reset_head(NULL, "reset", NULL, 0) < 0)
827 die(_("could not discard worktree changes"));
828 if (read_basic_state(&options))
829 exit(1);
830 goto run_rebase;
831 }
5e5d9619
PK
832 case ACTION_ABORT: {
833 struct string_list merge_rr = STRING_LIST_INIT_DUP;
834 options.action = "abort";
835
836 rerere_clear(&merge_rr);
837 string_list_clear(&merge_rr, 1);
838
839 if (read_basic_state(&options))
840 exit(1);
841 if (reset_head(&options.orig_head, "reset",
842 options.head_name, 0) < 0)
843 die(_("could not move back to %s"),
844 oid_to_hex(&options.orig_head));
845 ret = finish_rebase(&options);
846 goto cleanup;
847 }
5a614945
PK
848 case ACTION_QUIT: {
849 strbuf_reset(&buf);
850 strbuf_addstr(&buf, options.state_dir);
851 ret = !!remove_dir_recursively(&buf, 0);
852 if (ret)
853 die(_("could not remove '%s'"), options.state_dir);
854 goto cleanup;
855 }
51e9ea6d
PK
856 case ACTION_EDIT_TODO:
857 options.action = "edit-todo";
858 options.dont_finish_rebase = 1;
859 goto run_rebase;
860 case ACTION_SHOW_CURRENT_PATCH:
861 options.action = "show-current-patch";
862 options.dont_finish_rebase = 1;
863 goto run_rebase;
864 case NO_ACTION:
865 break;
f9573628 866 default:
51e9ea6d 867 BUG("action: %d", action);
f9573628
PK
868 }
869
c54dacb5
PK
870 /* Make sure no rebase is in progress */
871 if (in_progress) {
872 const char *last_slash = strrchr(options.state_dir, '/');
873 const char *state_dir_base =
874 last_slash ? last_slash + 1 : options.state_dir;
875 const char *cmd_live_rebase =
876 "git rebase (--continue | --abort | --skip)";
877 strbuf_reset(&buf);
878 strbuf_addf(&buf, "rm -fr \"%s\"", options.state_dir);
879 die(_("It seems that there is already a %s directory, and\n"
880 "I wonder if you are in the middle of another rebase. "
881 "If that is the\n"
882 "case, please try\n\t%s\n"
883 "If that is not the case, please\n\t%s\n"
884 "and run me again. I am stopping in case you still "
885 "have something\n"
886 "valuable there.\n"),
887 state_dir_base, cmd_live_rebase, buf.buf);
888 }
889
b4c8eb02
PK
890 if (!(options.flags & REBASE_NO_QUIET))
891 strbuf_addstr(&options.git_am_opt, " -q");
892
38dbcef2
PK
893 if (committer_date_is_author_date) {
894 strbuf_addstr(&options.git_am_opt,
895 " --committer-date-is-author-date");
896 options.flags |= REBASE_FORCE;
897 }
898
99d8cc7c
PK
899 if (ignore_whitespace)
900 strbuf_addstr(&options.git_am_opt, " --ignore-whitespace");
901
53f9e5be
PK
902 if (ignore_date) {
903 strbuf_addstr(&options.git_am_opt, " --ignore-date");
904 options.flags |= REBASE_FORCE;
905 }
906
002ee2fe
PK
907 if (options.keep_empty)
908 imply_interactive(&options, "--keep-empty");
909
12026a41
PK
910 if (gpg_sign) {
911 free(options.gpg_sign_opt);
912 options.gpg_sign_opt = xstrfmt("-S%s", gpg_sign);
913 }
914
7998dbe1
PK
915 if (opt_c >= 0)
916 strbuf_addf(&options.git_am_opt, " -C%d", opt_c);
917
918 if (whitespace.nr) {
919 int i;
920
921 for (i = 0; i < whitespace.nr; i++) {
922 const char *item = whitespace.items[i].string;
923
924 strbuf_addf(&options.git_am_opt, " --whitespace=%s",
925 item);
926
927 if ((!strcmp(item, "fix")) || (!strcmp(item, "strip")))
928 options.flags |= REBASE_FORCE;
929 }
930 }
931
68e46d78
PK
932 if (exec.nr) {
933 int i;
934
935 imply_interactive(&options, "--exec");
936
937 strbuf_reset(&buf);
938 for (i = 0; i < exec.nr; i++)
939 strbuf_addf(&buf, "exec %s\n", exec.items[i].string);
940 options.cmd = xstrdup(buf.buf);
941 }
942
ac7f467f
PK
943 switch (options.type) {
944 case REBASE_MERGE:
945 case REBASE_INTERACTIVE:
946 case REBASE_PRESERVE_MERGES:
947 options.state_dir = merge_dir();
948 break;
949 case REBASE_AM:
950 options.state_dir = apply_dir();
951 break;
952 default:
953 /* the default rebase backend is `--am` */
954 options.type = REBASE_AM;
955 options.state_dir = apply_dir();
956 break;
957 }
958
73d51ed0
PK
959 if (options.signoff) {
960 if (options.type == REBASE_PRESERVE_MERGES)
961 die("cannot combine '--signoff' with "
962 "'--preserve-merges'");
963 strbuf_addstr(&options.git_am_opt, " --signoff");
964 options.flags |= REBASE_FORCE;
965 }
966
ac7f467f 967 if (!options.root) {
f28d40d3 968 if (argc < 1)
ac7f467f
PK
969 die("TODO: handle @{upstream}");
970 else {
f28d40d3 971 options.upstream_name = argv[0];
ac7f467f
PK
972 argc--;
973 argv++;
974 if (!strcmp(options.upstream_name, "-"))
975 options.upstream_name = "@{-1}";
976 }
977 options.upstream = peel_committish(options.upstream_name);
978 if (!options.upstream)
979 die(_("invalid upstream '%s'"), options.upstream_name);
06e4775a 980 options.upstream_arg = options.upstream_name;
ac7f467f
PK
981 } else
982 die("TODO: upstream for --root");
983
984 /* Make sure the branch to rebase onto is valid. */
985 if (!options.onto_name)
986 options.onto_name = options.upstream_name;
987 if (strstr(options.onto_name, "...")) {
075bc852
PK
988 if (get_oid_mb(options.onto_name, &merge_base) < 0)
989 die(_("'%s': need exactly one merge base"),
990 options.onto_name);
991 options.onto = lookup_commit_or_die(&merge_base,
992 options.onto_name);
ac7f467f
PK
993 } else {
994 options.onto = peel_committish(options.onto_name);
995 if (!options.onto)
996 die(_("Does not point to a valid commit '%s'"),
997 options.onto_name);
998 }
999
1000 /*
1001 * If the branch to rebase is given, that is the branch we will rebase
1002 * branch_name -- branch/commit being rebased, or
1003 * HEAD (already detached)
1004 * orig_head -- commit object name of tip of the branch before rebasing
d4c569f8 1005 * head_name -- refs/heads/<that-branch> or NULL (detached HEAD)
ac7f467f 1006 */
e65123a7
PK
1007 if (argc == 1) {
1008 /* Is it "rebase other branchname" or "rebase other commit"? */
1009 branch_name = argv[0];
1010 options.switch_to = argv[0];
1011
1012 /* Is it a local branch? */
1013 strbuf_reset(&buf);
1014 strbuf_addf(&buf, "refs/heads/%s", branch_name);
1015 if (!read_ref(buf.buf, &options.orig_head))
1016 options.head_name = xstrdup(buf.buf);
1017 /* If not is it a valid ref (branch or commit)? */
1018 else if (!get_oid(branch_name, &options.orig_head))
1019 options.head_name = NULL;
1020 else
1021 die(_("fatal: no such branch/commit '%s'"),
1022 branch_name);
1023 } else if (argc == 0) {
ac7f467f
PK
1024 /* Do not need to switch branches, we are already on it. */
1025 options.head_name =
1026 xstrdup_or_null(resolve_ref_unsafe("HEAD", 0, NULL,
1027 &flags));
1028 if (!options.head_name)
1029 die(_("No such ref: %s"), "HEAD");
1030 if (flags & REF_ISSYMREF) {
1031 if (!skip_prefix(options.head_name,
1032 "refs/heads/", &branch_name))
1033 branch_name = options.head_name;
1034
1035 } else {
d4c569f8
PK
1036 free(options.head_name);
1037 options.head_name = NULL;
ac7f467f
PK
1038 branch_name = "HEAD";
1039 }
1040 if (get_oid("HEAD", &options.orig_head))
1041 die(_("Could not resolve HEAD to a revision"));
e65123a7
PK
1042 } else
1043 BUG("unexpected number of arguments left to parse");
ac7f467f 1044
e0333e5c
PK
1045 if (read_index(the_repository->index) < 0)
1046 die(_("could not read index"));
1047
6defce2b
PK
1048 if (options.autostash) {
1049 struct lock_file lock_file = LOCK_INIT;
1050 int fd;
1051
1052 fd = hold_locked_index(&lock_file, 0);
1053 refresh_cache(REFRESH_QUIET);
1054 if (0 <= fd)
1055 update_index_if_able(&the_index, &lock_file);
1056 rollback_lock_file(&lock_file);
1057
1058 if (has_unstaged_changes(0) || has_uncommitted_changes(0)) {
1059 const char *autostash =
1060 state_dir_path("autostash", &options);
1061 struct child_process stash = CHILD_PROCESS_INIT;
1062 struct object_id oid;
1063 struct commit *head =
1064 lookup_commit_reference(the_repository,
1065 &options.orig_head);
1066
1067 argv_array_pushl(&stash.args,
1068 "stash", "create", "autostash", NULL);
1069 stash.git_cmd = 1;
1070 stash.no_stdin = 1;
1071 strbuf_reset(&buf);
1072 if (capture_command(&stash, &buf, GIT_MAX_HEXSZ))
1073 die(_("Cannot autostash"));
1074 strbuf_trim_trailing_newline(&buf);
1075 if (get_oid(buf.buf, &oid))
1076 die(_("Unexpected stash response: '%s'"),
1077 buf.buf);
1078 strbuf_reset(&buf);
1079 strbuf_add_unique_abbrev(&buf, &oid, DEFAULT_ABBREV);
1080
1081 if (safe_create_leading_directories_const(autostash))
1082 die(_("Could not create directory for '%s'"),
1083 options.state_dir);
1084 write_file(autostash, "%s", buf.buf);
1085 printf(_("Created autostash: %s\n"), buf.buf);
1086 if (reset_head(&head->object.oid, "reset --hard",
1087 NULL, 0) < 0)
1088 die(_("could not reset --hard"));
1089 printf(_("HEAD is now at %s"),
1090 find_unique_abbrev(&head->object.oid,
1091 DEFAULT_ABBREV));
1092 strbuf_reset(&buf);
1093 pp_commit_easy(CMIT_FMT_ONELINE, head, &buf);
1094 if (buf.len > 0)
1095 printf(" %s", buf.buf);
1096 putchar('\n');
1097
1098 if (discard_index(the_repository->index) < 0 ||
1099 read_index(the_repository->index) < 0)
1100 die(_("could not read index"));
1101 }
1102 }
1103
e0333e5c
PK
1104 if (require_clean_work_tree("rebase",
1105 _("Please commit or stash them."), 1, 1)) {
1106 ret = 1;
1107 goto cleanup;
1108 }
1109
9a48a615
PK
1110 /*
1111 * Now we are rebasing commits upstream..orig_head (or with --root,
1112 * everything leading up to orig_head) on top of onto.
1113 */
1114
1115 /*
1116 * Check if we are already based on onto with linear history,
1117 * but this should be done only when upstream and onto are the same
1118 * and if this is not an interactive rebase.
1119 */
1120 if (can_fast_forward(options.onto, &options.orig_head, &merge_base) &&
1121 !is_interactive(&options) && !options.restrict_revision &&
1122 !oidcmp(&options.upstream->object.oid, &options.onto->object.oid)) {
1123 int flag;
1124
1ed9c14f 1125 if (!(options.flags & REBASE_FORCE)) {
e65123a7
PK
1126 /* Lazily switch to the target branch if needed... */
1127 if (options.switch_to) {
1128 struct object_id oid;
1129
1130 if (get_oid(options.switch_to, &oid) < 0) {
1131 ret = !!error(_("could not parse '%s'"),
1132 options.switch_to);
1133 goto cleanup;
1134 }
1135
1136 strbuf_reset(&buf);
1137 strbuf_addf(&buf, "rebase: checkout %s",
1138 options.switch_to);
1139 if (reset_head(&oid, "checkout",
1140 options.head_name, 0) < 0) {
1141 ret = !!error(_("could not switch to "
1142 "%s"),
1143 options.switch_to);
1144 goto cleanup;
1145 }
1146 }
1147
1ed9c14f
PK
1148 if (!(options.flags & REBASE_NO_QUIET))
1149 ; /* be quiet */
1150 else if (!strcmp(branch_name, "HEAD") &&
1151 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
1152 puts(_("HEAD is up to date."));
1153 else
1154 printf(_("Current branch %s is up to date.\n"),
1155 branch_name);
1156 ret = !!finish_rebase(&options);
1157 goto cleanup;
1158 } else if (!(options.flags & REBASE_NO_QUIET))
9a48a615
PK
1159 ; /* be quiet */
1160 else if (!strcmp(branch_name, "HEAD") &&
1161 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
1162 puts(_("HEAD is up to date, rebase forced."));
1163 else
1164 printf(_("Current branch %s is up to date, rebase "
1165 "forced.\n"), branch_name);
1166 }
1167
06e4775a
PK
1168 /* If a hook exists, give it a chance to interrupt*/
1169 if (!ok_to_skip_pre_rebase &&
1170 run_hook_le(NULL, "pre-rebase", options.upstream_arg,
1171 argc ? argv[0] : NULL, NULL))
1172 die(_("The pre-rebase hook refused to rebase."));
1173
bff014da
PK
1174 if (options.flags & REBASE_DIFFSTAT) {
1175 struct diff_options opts;
1176
1177 if (options.flags & REBASE_VERBOSE)
1178 printf(_("Changes from %s to %s:\n"),
1179 oid_to_hex(&merge_base),
1180 oid_to_hex(&options.onto->object.oid));
1181
1182 /* We want color (if set), but no pager */
1183 diff_setup(&opts);
1184 opts.stat_width = -1; /* use full terminal width */
1185 opts.stat_graph_width = -1; /* respect statGraphWidth config */
1186 opts.output_format |=
1187 DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
1188 opts.detect_rename = DIFF_DETECT_RENAME;
1189 diff_setup_done(&opts);
1190 diff_tree_oid(&merge_base, &options.onto->object.oid,
1191 "", &opts);
1192 diffcore_std(&opts);
1193 diff_flush(&opts);
1194 }
1195
361badd3
PK
1196 if (is_interactive(&options))
1197 goto run_rebase;
1198
bff014da
PK
1199 /* Detach HEAD and reset the tree */
1200 if (options.flags & REBASE_NO_QUIET)
1201 printf(_("First, rewinding head to replay your work on top of "
1202 "it...\n"));
1203
ac7f467f
PK
1204 strbuf_addf(&msg, "rebase: checkout %s", options.onto_name);
1205 if (reset_head(&options.onto->object.oid, "checkout", NULL, 1))
1206 die(_("Could not detach HEAD"));
1207 strbuf_release(&msg);
1208
1209 strbuf_addf(&revisions, "%s..%s",
1210 options.root ? oid_to_hex(&options.onto->object.oid) :
1211 (options.restrict_revision ?
1212 oid_to_hex(&options.restrict_revision->object.oid) :
1213 oid_to_hex(&options.upstream->object.oid)),
1214 oid_to_hex(&options.orig_head));
1215
1216 options.revisions = revisions.buf;
1217
f9573628 1218run_rebase:
ac7f467f
PK
1219 ret = !!run_specific_rebase(&options);
1220
e0333e5c 1221cleanup:
ac7f467f
PK
1222 strbuf_release(&revisions);
1223 free(options.head_name);
12026a41 1224 free(options.gpg_sign_opt);
68e46d78 1225 free(options.cmd);
ac7f467f 1226 return ret;
55071ea2 1227}