rebase: replace incorrect logical negation by correct bitwise one
[git/git.git] / builtin / rebase.c
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"
12 #include "packfile.h"
13 #include "refs.h"
14 #include "quote.h"
15 #include "config.h"
16 #include "cache-tree.h"
17 #include "unpack-trees.h"
18 #include "lockfile.h"
19 #include "parse-options.h"
20 #include "commit.h"
21 #include "diff.h"
22 #include "wt-status.h"
23 #include "revision.h"
24 #include "commit-reach.h"
25 #include "rerere.h"
26 #include "branch.h"
27
28 static char const * const builtin_rebase_usage[] = {
29 N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] "
30 "[<upstream>] [<branch>]"),
31 N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] "
32 "--root [<branch>]"),
33 N_("git rebase --continue | --abort | --skip | --edit-todo"),
34 NULL
35 };
36
37 static GIT_PATH_FUNC(apply_dir, "rebase-apply")
38 static GIT_PATH_FUNC(merge_dir, "rebase-merge")
39
40 enum rebase_type {
41 REBASE_UNSPECIFIED = -1,
42 REBASE_AM,
43 REBASE_MERGE,
44 REBASE_INTERACTIVE,
45 REBASE_PRESERVE_MERGES
46 };
47
48 static int use_builtin_rebase(void)
49 {
50 struct child_process cp = CHILD_PROCESS_INIT;
51 struct strbuf out = STRBUF_INIT;
52 int ret, env = git_env_bool("GIT_TEST_REBASE_USE_BUILTIN", -1);
53
54 if (env != -1)
55 return env;
56
57 argv_array_pushl(&cp.args,
58 "config", "--bool", "rebase.usebuiltin", NULL);
59 cp.git_cmd = 1;
60 if (capture_command(&cp, &out, 6)) {
61 strbuf_release(&out);
62 return 1;
63 }
64
65 strbuf_trim(&out);
66 ret = !strcmp("true", out.buf);
67 strbuf_release(&out);
68 return ret;
69 }
70
71 struct rebase_options {
72 enum rebase_type type;
73 const char *state_dir;
74 struct commit *upstream;
75 const char *upstream_name;
76 const char *upstream_arg;
77 char *head_name;
78 struct object_id orig_head;
79 struct commit *onto;
80 const char *onto_name;
81 const char *revisions;
82 const char *switch_to;
83 int root;
84 struct object_id *squash_onto;
85 struct commit *restrict_revision;
86 int dont_finish_rebase;
87 enum {
88 REBASE_NO_QUIET = 1<<0,
89 REBASE_VERBOSE = 1<<1,
90 REBASE_DIFFSTAT = 1<<2,
91 REBASE_FORCE = 1<<3,
92 REBASE_INTERACTIVE_EXPLICIT = 1<<4,
93 } flags;
94 struct argv_array git_am_opts;
95 const char *action;
96 int signoff;
97 int allow_rerere_autoupdate;
98 int keep_empty;
99 int autosquash;
100 char *gpg_sign_opt;
101 int autostash;
102 char *cmd;
103 int allow_empty_message;
104 int rebase_merges, rebase_cousins;
105 char *strategy, *strategy_opts;
106 struct strbuf git_format_patch_opt;
107 };
108
109 static int is_interactive(struct rebase_options *opts)
110 {
111 return opts->type == REBASE_INTERACTIVE ||
112 opts->type == REBASE_PRESERVE_MERGES;
113 }
114
115 static void imply_interactive(struct rebase_options *opts, const char *option)
116 {
117 switch (opts->type) {
118 case REBASE_AM:
119 die(_("%s requires an interactive rebase"), option);
120 break;
121 case REBASE_INTERACTIVE:
122 case REBASE_PRESERVE_MERGES:
123 break;
124 case REBASE_MERGE:
125 /* we silently *upgrade* --merge to --interactive if needed */
126 default:
127 opts->type = REBASE_INTERACTIVE; /* implied */
128 break;
129 }
130 }
131
132 /* Returns the filename prefixed by the state_dir */
133 static const char *state_dir_path(const char *filename, struct rebase_options *opts)
134 {
135 static struct strbuf path = STRBUF_INIT;
136 static size_t prefix_len;
137
138 if (!prefix_len) {
139 strbuf_addf(&path, "%s/", opts->state_dir);
140 prefix_len = path.len;
141 }
142
143 strbuf_setlen(&path, prefix_len);
144 strbuf_addstr(&path, filename);
145 return path.buf;
146 }
147
148 /* Read one file, then strip line endings */
149 static int read_one(const char *path, struct strbuf *buf)
150 {
151 if (strbuf_read_file(buf, path, 0) < 0)
152 return error_errno(_("could not read '%s'"), path);
153 strbuf_trim_trailing_newline(buf);
154 return 0;
155 }
156
157 /* Initialize the rebase options from the state directory. */
158 static int read_basic_state(struct rebase_options *opts)
159 {
160 struct strbuf head_name = STRBUF_INIT;
161 struct strbuf buf = STRBUF_INIT;
162 struct object_id oid;
163
164 if (read_one(state_dir_path("head-name", opts), &head_name) ||
165 read_one(state_dir_path("onto", opts), &buf))
166 return -1;
167 opts->head_name = starts_with(head_name.buf, "refs/") ?
168 xstrdup(head_name.buf) : NULL;
169 strbuf_release(&head_name);
170 if (get_oid(buf.buf, &oid))
171 return error(_("could not get 'onto': '%s'"), buf.buf);
172 opts->onto = lookup_commit_or_die(&oid, buf.buf);
173
174 /*
175 * We always write to orig-head, but interactive rebase used to write to
176 * head. Fall back to reading from head to cover for the case that the
177 * user upgraded git with an ongoing interactive rebase.
178 */
179 strbuf_reset(&buf);
180 if (file_exists(state_dir_path("orig-head", opts))) {
181 if (read_one(state_dir_path("orig-head", opts), &buf))
182 return -1;
183 } else if (read_one(state_dir_path("head", opts), &buf))
184 return -1;
185 if (get_oid(buf.buf, &opts->orig_head))
186 return error(_("invalid orig-head: '%s'"), buf.buf);
187
188 strbuf_reset(&buf);
189 if (read_one(state_dir_path("quiet", opts), &buf))
190 return -1;
191 if (buf.len)
192 opts->flags &= ~REBASE_NO_QUIET;
193 else
194 opts->flags |= REBASE_NO_QUIET;
195
196 if (file_exists(state_dir_path("verbose", opts)))
197 opts->flags |= REBASE_VERBOSE;
198
199 if (file_exists(state_dir_path("signoff", opts))) {
200 opts->signoff = 1;
201 opts->flags |= REBASE_FORCE;
202 }
203
204 if (file_exists(state_dir_path("allow_rerere_autoupdate", opts))) {
205 strbuf_reset(&buf);
206 if (read_one(state_dir_path("allow_rerere_autoupdate", opts),
207 &buf))
208 return -1;
209 if (!strcmp(buf.buf, "--rerere-autoupdate"))
210 opts->allow_rerere_autoupdate = 1;
211 else if (!strcmp(buf.buf, "--no-rerere-autoupdate"))
212 opts->allow_rerere_autoupdate = 0;
213 else
214 warning(_("ignoring invalid allow_rerere_autoupdate: "
215 "'%s'"), buf.buf);
216 } else
217 opts->allow_rerere_autoupdate = -1;
218
219 if (file_exists(state_dir_path("gpg_sign_opt", opts))) {
220 strbuf_reset(&buf);
221 if (read_one(state_dir_path("gpg_sign_opt", opts),
222 &buf))
223 return -1;
224 free(opts->gpg_sign_opt);
225 opts->gpg_sign_opt = xstrdup(buf.buf);
226 }
227
228 if (file_exists(state_dir_path("strategy", opts))) {
229 strbuf_reset(&buf);
230 if (read_one(state_dir_path("strategy", opts), &buf))
231 return -1;
232 free(opts->strategy);
233 opts->strategy = xstrdup(buf.buf);
234 }
235
236 if (file_exists(state_dir_path("strategy_opts", opts))) {
237 strbuf_reset(&buf);
238 if (read_one(state_dir_path("strategy_opts", opts), &buf))
239 return -1;
240 free(opts->strategy_opts);
241 opts->strategy_opts = xstrdup(buf.buf);
242 }
243
244 strbuf_release(&buf);
245
246 return 0;
247 }
248
249 static int apply_autostash(struct rebase_options *opts)
250 {
251 const char *path = state_dir_path("autostash", opts);
252 struct strbuf autostash = STRBUF_INIT;
253 struct child_process stash_apply = CHILD_PROCESS_INIT;
254
255 if (!file_exists(path))
256 return 0;
257
258 if (read_one(path, &autostash))
259 return error(_("Could not read '%s'"), path);
260 /* Ensure that the hash is not mistaken for a number */
261 strbuf_addstr(&autostash, "^0");
262 argv_array_pushl(&stash_apply.args,
263 "stash", "apply", autostash.buf, NULL);
264 stash_apply.git_cmd = 1;
265 stash_apply.no_stderr = stash_apply.no_stdout =
266 stash_apply.no_stdin = 1;
267 if (!run_command(&stash_apply))
268 printf(_("Applied autostash.\n"));
269 else {
270 struct argv_array args = ARGV_ARRAY_INIT;
271 int res = 0;
272
273 argv_array_pushl(&args,
274 "stash", "store", "-m", "autostash", "-q",
275 autostash.buf, NULL);
276 if (run_command_v_opt(args.argv, RUN_GIT_CMD))
277 res = error(_("Cannot store %s"), autostash.buf);
278 argv_array_clear(&args);
279 strbuf_release(&autostash);
280 if (res)
281 return res;
282
283 fprintf(stderr,
284 _("Applying autostash resulted in conflicts.\n"
285 "Your changes are safe in the stash.\n"
286 "You can run \"git stash pop\" or \"git stash drop\" "
287 "at any time.\n"));
288 }
289
290 strbuf_release(&autostash);
291 return 0;
292 }
293
294 static int finish_rebase(struct rebase_options *opts)
295 {
296 struct strbuf dir = STRBUF_INIT;
297 const char *argv_gc_auto[] = { "gc", "--auto", NULL };
298
299 delete_ref(NULL, "REBASE_HEAD", NULL, REF_NO_DEREF);
300 apply_autostash(opts);
301 close_all_packs(the_repository->objects);
302 /*
303 * We ignore errors in 'gc --auto', since the
304 * user should see them.
305 */
306 run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
307 strbuf_addstr(&dir, opts->state_dir);
308 remove_dir_recursively(&dir, 0);
309 strbuf_release(&dir);
310
311 return 0;
312 }
313
314 static struct commit *peel_committish(const char *name)
315 {
316 struct object *obj;
317 struct object_id oid;
318
319 if (get_oid(name, &oid))
320 return NULL;
321 obj = parse_object(the_repository, &oid);
322 return (struct commit *)peel_to_type(name, 0, obj, OBJ_COMMIT);
323 }
324
325 static void add_var(struct strbuf *buf, const char *name, const char *value)
326 {
327 if (!value)
328 strbuf_addf(buf, "unset %s; ", name);
329 else {
330 strbuf_addf(buf, "%s=", name);
331 sq_quote_buf(buf, value);
332 strbuf_addstr(buf, "; ");
333 }
334 }
335
336 static const char *resolvemsg =
337 N_("Resolve all conflicts manually, mark them as resolved with\n"
338 "\"git add/rm <conflicted_files>\", then run \"git rebase --continue\".\n"
339 "You can instead skip this commit: run \"git rebase --skip\".\n"
340 "To abort and get back to the state before \"git rebase\", run "
341 "\"git rebase --abort\".");
342
343 static int run_specific_rebase(struct rebase_options *opts)
344 {
345 const char *argv[] = { NULL, NULL };
346 struct strbuf script_snippet = STRBUF_INIT, buf = STRBUF_INIT;
347 int status;
348 const char *backend, *backend_func;
349
350 if (opts->type == REBASE_INTERACTIVE) {
351 /* Run builtin interactive rebase */
352 struct child_process child = CHILD_PROCESS_INIT;
353
354 argv_array_pushf(&child.env_array, "GIT_CHERRY_PICK_HELP=%s",
355 resolvemsg);
356 if (!(opts->flags & REBASE_INTERACTIVE_EXPLICIT)) {
357 argv_array_push(&child.env_array, "GIT_EDITOR=:");
358 opts->autosquash = 0;
359 }
360
361 child.git_cmd = 1;
362 argv_array_push(&child.args, "rebase--interactive");
363
364 if (opts->action)
365 argv_array_pushf(&child.args, "--%s", opts->action);
366 if (opts->keep_empty)
367 argv_array_push(&child.args, "--keep-empty");
368 if (opts->rebase_merges)
369 argv_array_push(&child.args, "--rebase-merges");
370 if (opts->rebase_cousins)
371 argv_array_push(&child.args, "--rebase-cousins");
372 if (opts->autosquash)
373 argv_array_push(&child.args, "--autosquash");
374 if (opts->flags & REBASE_VERBOSE)
375 argv_array_push(&child.args, "--verbose");
376 if (opts->flags & REBASE_FORCE)
377 argv_array_push(&child.args, "--no-ff");
378 if (opts->restrict_revision)
379 argv_array_pushf(&child.args,
380 "--restrict-revision=^%s",
381 oid_to_hex(&opts->restrict_revision->object.oid));
382 if (opts->upstream)
383 argv_array_pushf(&child.args, "--upstream=%s",
384 oid_to_hex(&opts->upstream->object.oid));
385 if (opts->onto)
386 argv_array_pushf(&child.args, "--onto=%s",
387 oid_to_hex(&opts->onto->object.oid));
388 if (opts->squash_onto)
389 argv_array_pushf(&child.args, "--squash-onto=%s",
390 oid_to_hex(opts->squash_onto));
391 if (opts->onto_name)
392 argv_array_pushf(&child.args, "--onto-name=%s",
393 opts->onto_name);
394 argv_array_pushf(&child.args, "--head-name=%s",
395 opts->head_name ?
396 opts->head_name : "detached HEAD");
397 if (opts->strategy)
398 argv_array_pushf(&child.args, "--strategy=%s",
399 opts->strategy);
400 if (opts->strategy_opts)
401 argv_array_pushf(&child.args, "--strategy-opts=%s",
402 opts->strategy_opts);
403 if (opts->switch_to)
404 argv_array_pushf(&child.args, "--switch-to=%s",
405 opts->switch_to);
406 if (opts->cmd)
407 argv_array_pushf(&child.args, "--cmd=%s", opts->cmd);
408 if (opts->allow_empty_message)
409 argv_array_push(&child.args, "--allow-empty-message");
410 if (opts->allow_rerere_autoupdate > 0)
411 argv_array_push(&child.args, "--rerere-autoupdate");
412 else if (opts->allow_rerere_autoupdate == 0)
413 argv_array_push(&child.args, "--no-rerere-autoupdate");
414 if (opts->gpg_sign_opt)
415 argv_array_push(&child.args, opts->gpg_sign_opt);
416 if (opts->signoff)
417 argv_array_push(&child.args, "--signoff");
418
419 status = run_command(&child);
420 goto finished_rebase;
421 }
422
423 add_var(&script_snippet, "GIT_DIR", absolute_path(get_git_dir()));
424 add_var(&script_snippet, "state_dir", opts->state_dir);
425
426 add_var(&script_snippet, "upstream_name", opts->upstream_name);
427 add_var(&script_snippet, "upstream", opts->upstream ?
428 oid_to_hex(&opts->upstream->object.oid) : NULL);
429 add_var(&script_snippet, "head_name",
430 opts->head_name ? opts->head_name : "detached HEAD");
431 add_var(&script_snippet, "orig_head", oid_to_hex(&opts->orig_head));
432 add_var(&script_snippet, "onto", opts->onto ?
433 oid_to_hex(&opts->onto->object.oid) : NULL);
434 add_var(&script_snippet, "onto_name", opts->onto_name);
435 add_var(&script_snippet, "revisions", opts->revisions);
436 add_var(&script_snippet, "restrict_revision", opts->restrict_revision ?
437 oid_to_hex(&opts->restrict_revision->object.oid) : NULL);
438 add_var(&script_snippet, "GIT_QUIET",
439 opts->flags & REBASE_NO_QUIET ? "" : "t");
440 sq_quote_argv_pretty(&buf, opts->git_am_opts.argv);
441 add_var(&script_snippet, "git_am_opt", buf.buf);
442 strbuf_release(&buf);
443 add_var(&script_snippet, "verbose",
444 opts->flags & REBASE_VERBOSE ? "t" : "");
445 add_var(&script_snippet, "diffstat",
446 opts->flags & REBASE_DIFFSTAT ? "t" : "");
447 add_var(&script_snippet, "force_rebase",
448 opts->flags & REBASE_FORCE ? "t" : "");
449 if (opts->switch_to)
450 add_var(&script_snippet, "switch_to", opts->switch_to);
451 add_var(&script_snippet, "action", opts->action ? opts->action : "");
452 add_var(&script_snippet, "signoff", opts->signoff ? "--signoff" : "");
453 add_var(&script_snippet, "allow_rerere_autoupdate",
454 opts->allow_rerere_autoupdate < 0 ? "" :
455 opts->allow_rerere_autoupdate ?
456 "--rerere-autoupdate" : "--no-rerere-autoupdate");
457 add_var(&script_snippet, "keep_empty", opts->keep_empty ? "yes" : "");
458 add_var(&script_snippet, "autosquash", opts->autosquash ? "t" : "");
459 add_var(&script_snippet, "gpg_sign_opt", opts->gpg_sign_opt);
460 add_var(&script_snippet, "cmd", opts->cmd);
461 add_var(&script_snippet, "allow_empty_message",
462 opts->allow_empty_message ? "--allow-empty-message" : "");
463 add_var(&script_snippet, "rebase_merges",
464 opts->rebase_merges ? "t" : "");
465 add_var(&script_snippet, "rebase_cousins",
466 opts->rebase_cousins ? "t" : "");
467 add_var(&script_snippet, "strategy", opts->strategy);
468 add_var(&script_snippet, "strategy_opts", opts->strategy_opts);
469 add_var(&script_snippet, "rebase_root", opts->root ? "t" : "");
470 add_var(&script_snippet, "squash_onto",
471 opts->squash_onto ? oid_to_hex(opts->squash_onto) : "");
472 add_var(&script_snippet, "git_format_patch_opt",
473 opts->git_format_patch_opt.buf);
474
475 if (is_interactive(opts) &&
476 !(opts->flags & REBASE_INTERACTIVE_EXPLICIT)) {
477 strbuf_addstr(&script_snippet,
478 "GIT_EDITOR=:; export GIT_EDITOR; ");
479 opts->autosquash = 0;
480 }
481
482 switch (opts->type) {
483 case REBASE_AM:
484 backend = "git-rebase--am";
485 backend_func = "git_rebase__am";
486 break;
487 case REBASE_MERGE:
488 backend = "git-rebase--merge";
489 backend_func = "git_rebase__merge";
490 break;
491 case REBASE_PRESERVE_MERGES:
492 backend = "git-rebase--preserve-merges";
493 backend_func = "git_rebase__preserve_merges";
494 break;
495 default:
496 BUG("Unhandled rebase type %d", opts->type);
497 break;
498 }
499
500 strbuf_addf(&script_snippet,
501 ". git-sh-setup && . git-rebase--common &&"
502 " . %s && %s", backend, backend_func);
503 argv[0] = script_snippet.buf;
504
505 status = run_command_v_opt(argv, RUN_USING_SHELL);
506 finished_rebase:
507 if (opts->dont_finish_rebase)
508 ; /* do nothing */
509 else if (opts->type == REBASE_INTERACTIVE)
510 ; /* interactive rebase cleans up after itself */
511 else if (status == 0) {
512 if (!file_exists(state_dir_path("stopped-sha", opts)))
513 finish_rebase(opts);
514 } else if (status == 2) {
515 struct strbuf dir = STRBUF_INIT;
516
517 apply_autostash(opts);
518 strbuf_addstr(&dir, opts->state_dir);
519 remove_dir_recursively(&dir, 0);
520 strbuf_release(&dir);
521 die("Nothing to do");
522 }
523
524 strbuf_release(&script_snippet);
525
526 return status ? -1 : 0;
527 }
528
529 #define GIT_REFLOG_ACTION_ENVIRONMENT "GIT_REFLOG_ACTION"
530
531 #define RESET_HEAD_DETACH (1<<0)
532 #define RESET_HEAD_HARD (1<<1)
533
534 static int reset_head(struct object_id *oid, const char *action,
535 const char *switch_to_branch, unsigned flags,
536 const char *reflog_orig_head, const char *reflog_head)
537 {
538 unsigned detach_head = flags & RESET_HEAD_DETACH;
539 unsigned reset_hard = flags & RESET_HEAD_HARD;
540 struct object_id head_oid;
541 struct tree_desc desc[2] = { { NULL }, { NULL } };
542 struct lock_file lock = LOCK_INIT;
543 struct unpack_trees_options unpack_tree_opts;
544 struct tree *tree;
545 const char *reflog_action;
546 struct strbuf msg = STRBUF_INIT;
547 size_t prefix_len;
548 struct object_id *orig = NULL, oid_orig,
549 *old_orig = NULL, oid_old_orig;
550 int ret = 0, nr = 0;
551
552 if (switch_to_branch && !starts_with(switch_to_branch, "refs/"))
553 BUG("Not a fully qualified branch: '%s'", switch_to_branch);
554
555 if (hold_locked_index(&lock, LOCK_REPORT_ON_ERROR) < 0) {
556 ret = -1;
557 goto leave_reset_head;
558 }
559
560 if ((!oid || !reset_hard) && get_oid("HEAD", &head_oid)) {
561 ret = error(_("could not determine HEAD revision"));
562 goto leave_reset_head;
563 }
564
565 if (!oid)
566 oid = &head_oid;
567
568 memset(&unpack_tree_opts, 0, sizeof(unpack_tree_opts));
569 setup_unpack_trees_porcelain(&unpack_tree_opts, action);
570 unpack_tree_opts.head_idx = 1;
571 unpack_tree_opts.src_index = the_repository->index;
572 unpack_tree_opts.dst_index = the_repository->index;
573 unpack_tree_opts.fn = reset_hard ? oneway_merge : twoway_merge;
574 unpack_tree_opts.update = 1;
575 unpack_tree_opts.merge = 1;
576 if (!detach_head)
577 unpack_tree_opts.reset = 1;
578
579 if (read_index_unmerged(the_repository->index) < 0) {
580 ret = error(_("could not read index"));
581 goto leave_reset_head;
582 }
583
584 if (!reset_hard && !fill_tree_descriptor(&desc[nr++], &head_oid)) {
585 ret = error(_("failed to find tree of %s"),
586 oid_to_hex(&head_oid));
587 goto leave_reset_head;
588 }
589
590 if (!fill_tree_descriptor(&desc[nr++], oid)) {
591 ret = error(_("failed to find tree of %s"), oid_to_hex(oid));
592 goto leave_reset_head;
593 }
594
595 if (unpack_trees(nr, desc, &unpack_tree_opts)) {
596 ret = -1;
597 goto leave_reset_head;
598 }
599
600 tree = parse_tree_indirect(oid);
601 prime_cache_tree(the_repository->index, tree);
602
603 if (write_locked_index(the_repository->index, &lock, COMMIT_LOCK) < 0) {
604 ret = error(_("could not write index"));
605 goto leave_reset_head;
606 }
607
608 reflog_action = getenv(GIT_REFLOG_ACTION_ENVIRONMENT);
609 strbuf_addf(&msg, "%s: ", reflog_action ? reflog_action : "rebase");
610 prefix_len = msg.len;
611
612 if (!get_oid("ORIG_HEAD", &oid_old_orig))
613 old_orig = &oid_old_orig;
614 if (!get_oid("HEAD", &oid_orig)) {
615 orig = &oid_orig;
616 if (!reflog_orig_head) {
617 strbuf_addstr(&msg, "updating ORIG_HEAD");
618 reflog_orig_head = msg.buf;
619 }
620 update_ref(reflog_orig_head, "ORIG_HEAD", orig, old_orig, 0,
621 UPDATE_REFS_MSG_ON_ERR);
622 } else if (old_orig)
623 delete_ref(NULL, "ORIG_HEAD", old_orig, 0);
624 if (!reflog_head) {
625 strbuf_setlen(&msg, prefix_len);
626 strbuf_addstr(&msg, "updating HEAD");
627 reflog_head = msg.buf;
628 }
629 if (!switch_to_branch)
630 ret = update_ref(reflog_head, "HEAD", oid, orig,
631 detach_head ? REF_NO_DEREF : 0,
632 UPDATE_REFS_MSG_ON_ERR);
633 else {
634 ret = create_symref("HEAD", switch_to_branch, msg.buf);
635 if (!ret)
636 ret = update_ref(reflog_head, "HEAD", oid, NULL, 0,
637 UPDATE_REFS_MSG_ON_ERR);
638 }
639
640 leave_reset_head:
641 strbuf_release(&msg);
642 rollback_lock_file(&lock);
643 while (nr)
644 free((void *)desc[--nr].buffer);
645 return ret;
646 }
647
648 static int rebase_config(const char *var, const char *value, void *data)
649 {
650 struct rebase_options *opts = data;
651
652 if (!strcmp(var, "rebase.stat")) {
653 if (git_config_bool(var, value))
654 opts->flags |= REBASE_DIFFSTAT;
655 else
656 opts->flags &= ~REBASE_DIFFSTAT;
657 return 0;
658 }
659
660 if (!strcmp(var, "rebase.autosquash")) {
661 opts->autosquash = git_config_bool(var, value);
662 return 0;
663 }
664
665 if (!strcmp(var, "commit.gpgsign")) {
666 free(opts->gpg_sign_opt);
667 opts->gpg_sign_opt = git_config_bool(var, value) ?
668 xstrdup("-S") : NULL;
669 return 0;
670 }
671
672 if (!strcmp(var, "rebase.autostash")) {
673 opts->autostash = git_config_bool(var, value);
674 return 0;
675 }
676
677 return git_default_config(var, value, data);
678 }
679
680 /*
681 * Determines whether the commits in from..to are linear, i.e. contain
682 * no merge commits. This function *expects* `from` to be an ancestor of
683 * `to`.
684 */
685 static int is_linear_history(struct commit *from, struct commit *to)
686 {
687 while (to && to != from) {
688 parse_commit(to);
689 if (!to->parents)
690 return 1;
691 if (to->parents->next)
692 return 0;
693 to = to->parents->item;
694 }
695 return 1;
696 }
697
698 static int can_fast_forward(struct commit *onto, struct object_id *head_oid,
699 struct object_id *merge_base)
700 {
701 struct commit *head = lookup_commit(the_repository, head_oid);
702 struct commit_list *merge_bases;
703 int res;
704
705 if (!head)
706 return 0;
707
708 merge_bases = get_merge_bases(onto, head);
709 if (merge_bases && !merge_bases->next) {
710 oidcpy(merge_base, &merge_bases->item->object.oid);
711 res = oideq(merge_base, &onto->object.oid);
712 } else {
713 oidcpy(merge_base, &null_oid);
714 res = 0;
715 }
716 free_commit_list(merge_bases);
717 return res && is_linear_history(onto, head);
718 }
719
720 /* -i followed by -m is still -i */
721 static int parse_opt_merge(const struct option *opt, const char *arg, int unset)
722 {
723 struct rebase_options *opts = opt->value;
724
725 BUG_ON_OPT_NEG(unset);
726 BUG_ON_OPT_ARG(arg);
727
728 if (!is_interactive(opts))
729 opts->type = REBASE_MERGE;
730
731 return 0;
732 }
733
734 /* -i followed by -p is still explicitly interactive, but -p alone is not */
735 static int parse_opt_interactive(const struct option *opt, const char *arg,
736 int unset)
737 {
738 struct rebase_options *opts = opt->value;
739
740 BUG_ON_OPT_NEG(unset);
741 BUG_ON_OPT_ARG(arg);
742
743 opts->type = REBASE_INTERACTIVE;
744 opts->flags |= REBASE_INTERACTIVE_EXPLICIT;
745
746 return 0;
747 }
748
749 static void NORETURN error_on_missing_default_upstream(void)
750 {
751 struct branch *current_branch = branch_get(NULL);
752
753 printf(_("%s\n"
754 "Please specify which branch you want to rebase against.\n"
755 "See git-rebase(1) for details.\n"
756 "\n"
757 " git rebase '<branch>'\n"
758 "\n"),
759 current_branch ? _("There is no tracking information for "
760 "the current branch.") :
761 _("You are not currently on a branch."));
762
763 if (current_branch) {
764 const char *remote = current_branch->remote_name;
765
766 if (!remote)
767 remote = _("<remote>");
768
769 printf(_("If you wish to set tracking information for this "
770 "branch you can do so with:\n"
771 "\n"
772 " git branch --set-upstream-to=%s/<branch> %s\n"
773 "\n"),
774 remote, current_branch->name);
775 }
776 exit(1);
777 }
778
779 static void set_reflog_action(struct rebase_options *options)
780 {
781 const char *env;
782 struct strbuf buf = STRBUF_INIT;
783
784 if (!is_interactive(options))
785 return;
786
787 env = getenv(GIT_REFLOG_ACTION_ENVIRONMENT);
788 if (env && strcmp("rebase", env))
789 return; /* only override it if it is "rebase" */
790
791 strbuf_addf(&buf, "rebase -i (%s)", options->action);
792 setenv(GIT_REFLOG_ACTION_ENVIRONMENT, buf.buf, 1);
793 strbuf_release(&buf);
794 }
795
796 int cmd_rebase(int argc, const char **argv, const char *prefix)
797 {
798 struct rebase_options options = {
799 .type = REBASE_UNSPECIFIED,
800 .flags = REBASE_NO_QUIET,
801 .git_am_opts = ARGV_ARRAY_INIT,
802 .allow_rerere_autoupdate = -1,
803 .allow_empty_message = 1,
804 .git_format_patch_opt = STRBUF_INIT,
805 };
806 const char *branch_name;
807 int ret, flags, total_argc, in_progress = 0;
808 int ok_to_skip_pre_rebase = 0;
809 struct strbuf msg = STRBUF_INIT;
810 struct strbuf revisions = STRBUF_INIT;
811 struct strbuf buf = STRBUF_INIT;
812 struct object_id merge_base;
813 enum {
814 NO_ACTION,
815 ACTION_CONTINUE,
816 ACTION_SKIP,
817 ACTION_ABORT,
818 ACTION_QUIT,
819 ACTION_EDIT_TODO,
820 ACTION_SHOW_CURRENT_PATCH,
821 } action = NO_ACTION;
822 const char *gpg_sign = NULL;
823 struct string_list exec = STRING_LIST_INIT_NODUP;
824 const char *rebase_merges = NULL;
825 int fork_point = -1;
826 struct string_list strategy_options = STRING_LIST_INIT_NODUP;
827 struct object_id squash_onto;
828 char *squash_onto_name = NULL;
829 struct option builtin_rebase_options[] = {
830 OPT_STRING(0, "onto", &options.onto_name,
831 N_("revision"),
832 N_("rebase onto given branch instead of upstream")),
833 OPT_BOOL(0, "no-verify", &ok_to_skip_pre_rebase,
834 N_("allow pre-rebase hook to run")),
835 OPT_NEGBIT('q', "quiet", &options.flags,
836 N_("be quiet. implies --no-stat"),
837 REBASE_NO_QUIET| REBASE_VERBOSE | REBASE_DIFFSTAT),
838 OPT_BIT('v', "verbose", &options.flags,
839 N_("display a diffstat of what changed upstream"),
840 REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT),
841 {OPTION_NEGBIT, 'n', "no-stat", &options.flags, NULL,
842 N_("do not show diffstat of what changed upstream"),
843 PARSE_OPT_NOARG, NULL, REBASE_DIFFSTAT },
844 OPT_BOOL(0, "signoff", &options.signoff,
845 N_("add a Signed-off-by: line to each commit")),
846 OPT_PASSTHRU_ARGV(0, "ignore-whitespace", &options.git_am_opts,
847 NULL, N_("passed to 'git am'"),
848 PARSE_OPT_NOARG),
849 OPT_PASSTHRU_ARGV(0, "committer-date-is-author-date",
850 &options.git_am_opts, NULL,
851 N_("passed to 'git am'"), PARSE_OPT_NOARG),
852 OPT_PASSTHRU_ARGV(0, "ignore-date", &options.git_am_opts, NULL,
853 N_("passed to 'git am'"), PARSE_OPT_NOARG),
854 OPT_PASSTHRU_ARGV('C', NULL, &options.git_am_opts, N_("n"),
855 N_("passed to 'git apply'"), 0),
856 OPT_PASSTHRU_ARGV(0, "whitespace", &options.git_am_opts,
857 N_("action"), N_("passed to 'git apply'"), 0),
858 OPT_BIT('f', "force-rebase", &options.flags,
859 N_("cherry-pick all commits, even if unchanged"),
860 REBASE_FORCE),
861 OPT_BIT(0, "no-ff", &options.flags,
862 N_("cherry-pick all commits, even if unchanged"),
863 REBASE_FORCE),
864 OPT_CMDMODE(0, "continue", &action, N_("continue"),
865 ACTION_CONTINUE),
866 OPT_CMDMODE(0, "skip", &action,
867 N_("skip current patch and continue"), ACTION_SKIP),
868 OPT_CMDMODE(0, "abort", &action,
869 N_("abort and check out the original branch"),
870 ACTION_ABORT),
871 OPT_CMDMODE(0, "quit", &action,
872 N_("abort but keep HEAD where it is"), ACTION_QUIT),
873 OPT_CMDMODE(0, "edit-todo", &action, N_("edit the todo list "
874 "during an interactive rebase"), ACTION_EDIT_TODO),
875 OPT_CMDMODE(0, "show-current-patch", &action,
876 N_("show the patch file being applied or merged"),
877 ACTION_SHOW_CURRENT_PATCH),
878 { OPTION_CALLBACK, 'm', "merge", &options, NULL,
879 N_("use merging strategies to rebase"),
880 PARSE_OPT_NOARG | PARSE_OPT_NONEG,
881 parse_opt_merge },
882 { OPTION_CALLBACK, 'i', "interactive", &options, NULL,
883 N_("let the user edit the list of commits to rebase"),
884 PARSE_OPT_NOARG | PARSE_OPT_NONEG,
885 parse_opt_interactive },
886 OPT_SET_INT('p', "preserve-merges", &options.type,
887 N_("try to recreate merges instead of ignoring "
888 "them"), REBASE_PRESERVE_MERGES),
889 OPT_BOOL(0, "rerere-autoupdate",
890 &options.allow_rerere_autoupdate,
891 N_("allow rerere to update index with resolved "
892 "conflict")),
893 OPT_BOOL('k', "keep-empty", &options.keep_empty,
894 N_("preserve empty commits during rebase")),
895 OPT_BOOL(0, "autosquash", &options.autosquash,
896 N_("move commits that begin with "
897 "squash!/fixup! under -i")),
898 { OPTION_STRING, 'S', "gpg-sign", &gpg_sign, N_("key-id"),
899 N_("GPG-sign commits"),
900 PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
901 OPT_BOOL(0, "autostash", &options.autostash,
902 N_("automatically stash/stash pop before and after")),
903 OPT_STRING_LIST('x', "exec", &exec, N_("exec"),
904 N_("add exec lines after each commit of the "
905 "editable list")),
906 OPT_BOOL(0, "allow-empty-message",
907 &options.allow_empty_message,
908 N_("allow rebasing commits with empty messages")),
909 {OPTION_STRING, 'r', "rebase-merges", &rebase_merges,
910 N_("mode"),
911 N_("try to rebase merges instead of skipping them"),
912 PARSE_OPT_OPTARG, NULL, (intptr_t)""},
913 OPT_BOOL(0, "fork-point", &fork_point,
914 N_("use 'merge-base --fork-point' to refine upstream")),
915 OPT_STRING('s', "strategy", &options.strategy,
916 N_("strategy"), N_("use the given merge strategy")),
917 OPT_STRING_LIST('X', "strategy-option", &strategy_options,
918 N_("option"),
919 N_("pass the argument through to the merge "
920 "strategy")),
921 OPT_BOOL(0, "root", &options.root,
922 N_("rebase all reachable commits up to the root(s)")),
923 OPT_END(),
924 };
925 int i;
926
927 /*
928 * NEEDSWORK: Once the builtin rebase has been tested enough
929 * and git-legacy-rebase.sh is retired to contrib/, this preamble
930 * can be removed.
931 */
932
933 if (!use_builtin_rebase()) {
934 const char *path = mkpath("%s/git-legacy-rebase",
935 git_exec_path());
936
937 if (sane_execvp(path, (char **)argv) < 0)
938 die_errno(_("could not exec %s"), path);
939 else
940 BUG("sane_execvp() returned???");
941 }
942
943 if (argc == 2 && !strcmp(argv[1], "-h"))
944 usage_with_options(builtin_rebase_usage,
945 builtin_rebase_options);
946
947 prefix = setup_git_directory();
948 trace_repo_setup(prefix);
949 setup_work_tree();
950
951 git_config(rebase_config, &options);
952
953 strbuf_reset(&buf);
954 strbuf_addf(&buf, "%s/applying", apply_dir());
955 if(file_exists(buf.buf))
956 die(_("It looks like 'git am' is in progress. Cannot rebase."));
957
958 if (is_directory(apply_dir())) {
959 options.type = REBASE_AM;
960 options.state_dir = apply_dir();
961 } else if (is_directory(merge_dir())) {
962 strbuf_reset(&buf);
963 strbuf_addf(&buf, "%s/rewritten", merge_dir());
964 if (is_directory(buf.buf)) {
965 options.type = REBASE_PRESERVE_MERGES;
966 options.flags |= REBASE_INTERACTIVE_EXPLICIT;
967 } else {
968 strbuf_reset(&buf);
969 strbuf_addf(&buf, "%s/interactive", merge_dir());
970 if(file_exists(buf.buf)) {
971 options.type = REBASE_INTERACTIVE;
972 options.flags |= REBASE_INTERACTIVE_EXPLICIT;
973 } else
974 options.type = REBASE_MERGE;
975 }
976 options.state_dir = merge_dir();
977 }
978
979 if (options.type != REBASE_UNSPECIFIED)
980 in_progress = 1;
981
982 total_argc = argc;
983 argc = parse_options(argc, argv, prefix,
984 builtin_rebase_options,
985 builtin_rebase_usage, 0);
986
987 if (action != NO_ACTION && total_argc != 2) {
988 usage_with_options(builtin_rebase_usage,
989 builtin_rebase_options);
990 }
991
992 if (argc > 2)
993 usage_with_options(builtin_rebase_usage,
994 builtin_rebase_options);
995
996 if (action != NO_ACTION && !in_progress)
997 die(_("No rebase in progress?"));
998 setenv(GIT_REFLOG_ACTION_ENVIRONMENT, "rebase", 0);
999
1000 if (action == ACTION_EDIT_TODO && !is_interactive(&options))
1001 die(_("The --edit-todo action can only be used during "
1002 "interactive rebase."));
1003
1004 switch (action) {
1005 case ACTION_CONTINUE: {
1006 struct object_id head;
1007 struct lock_file lock_file = LOCK_INIT;
1008 int fd;
1009
1010 options.action = "continue";
1011 set_reflog_action(&options);
1012
1013 /* Sanity check */
1014 if (get_oid("HEAD", &head))
1015 die(_("Cannot read HEAD"));
1016
1017 fd = hold_locked_index(&lock_file, 0);
1018 if (read_index(the_repository->index) < 0)
1019 die(_("could not read index"));
1020 refresh_index(the_repository->index, REFRESH_QUIET, NULL, NULL,
1021 NULL);
1022 if (0 <= fd)
1023 update_index_if_able(the_repository->index,
1024 &lock_file);
1025 rollback_lock_file(&lock_file);
1026
1027 if (has_unstaged_changes(1)) {
1028 puts(_("You must edit all merge conflicts and then\n"
1029 "mark them as resolved using git add"));
1030 exit(1);
1031 }
1032 if (read_basic_state(&options))
1033 exit(1);
1034 goto run_rebase;
1035 }
1036 case ACTION_SKIP: {
1037 struct string_list merge_rr = STRING_LIST_INIT_DUP;
1038
1039 options.action = "skip";
1040 set_reflog_action(&options);
1041
1042 rerere_clear(&merge_rr);
1043 string_list_clear(&merge_rr, 1);
1044
1045 if (reset_head(NULL, "reset", NULL, RESET_HEAD_HARD,
1046 NULL, NULL) < 0)
1047 die(_("could not discard worktree changes"));
1048 remove_branch_state();
1049 if (read_basic_state(&options))
1050 exit(1);
1051 goto run_rebase;
1052 }
1053 case ACTION_ABORT: {
1054 struct string_list merge_rr = STRING_LIST_INIT_DUP;
1055 options.action = "abort";
1056 set_reflog_action(&options);
1057
1058 rerere_clear(&merge_rr);
1059 string_list_clear(&merge_rr, 1);
1060
1061 if (read_basic_state(&options))
1062 exit(1);
1063 if (reset_head(&options.orig_head, "reset",
1064 options.head_name, RESET_HEAD_HARD,
1065 NULL, NULL) < 0)
1066 die(_("could not move back to %s"),
1067 oid_to_hex(&options.orig_head));
1068 remove_branch_state();
1069 ret = finish_rebase(&options);
1070 goto cleanup;
1071 }
1072 case ACTION_QUIT: {
1073 strbuf_reset(&buf);
1074 strbuf_addstr(&buf, options.state_dir);
1075 ret = !!remove_dir_recursively(&buf, 0);
1076 if (ret)
1077 die(_("could not remove '%s'"), options.state_dir);
1078 goto cleanup;
1079 }
1080 case ACTION_EDIT_TODO:
1081 options.action = "edit-todo";
1082 options.dont_finish_rebase = 1;
1083 goto run_rebase;
1084 case ACTION_SHOW_CURRENT_PATCH:
1085 options.action = "show-current-patch";
1086 options.dont_finish_rebase = 1;
1087 goto run_rebase;
1088 case NO_ACTION:
1089 break;
1090 default:
1091 BUG("action: %d", action);
1092 }
1093
1094 /* Make sure no rebase is in progress */
1095 if (in_progress) {
1096 const char *last_slash = strrchr(options.state_dir, '/');
1097 const char *state_dir_base =
1098 last_slash ? last_slash + 1 : options.state_dir;
1099 const char *cmd_live_rebase =
1100 "git rebase (--continue | --abort | --skip)";
1101 strbuf_reset(&buf);
1102 strbuf_addf(&buf, "rm -fr \"%s\"", options.state_dir);
1103 die(_("It seems that there is already a %s directory, and\n"
1104 "I wonder if you are in the middle of another rebase. "
1105 "If that is the\n"
1106 "case, please try\n\t%s\n"
1107 "If that is not the case, please\n\t%s\n"
1108 "and run me again. I am stopping in case you still "
1109 "have something\n"
1110 "valuable there.\n"),
1111 state_dir_base, cmd_live_rebase, buf.buf);
1112 }
1113
1114 for (i = 0; i < options.git_am_opts.argc; i++) {
1115 const char *option = options.git_am_opts.argv[i], *p;
1116 if (!strcmp(option, "--committer-date-is-author-date") ||
1117 !strcmp(option, "--ignore-date") ||
1118 !strcmp(option, "--whitespace=fix") ||
1119 !strcmp(option, "--whitespace=strip"))
1120 options.flags |= REBASE_FORCE;
1121 else if (skip_prefix(option, "-C", &p)) {
1122 while (*p)
1123 if (!isdigit(*(p++)))
1124 die(_("switch `C' expects a "
1125 "numerical value"));
1126 } else if (skip_prefix(option, "--whitespace=", &p)) {
1127 if (*p && strcmp(p, "warn") && strcmp(p, "nowarn") &&
1128 strcmp(p, "error") && strcmp(p, "error-all"))
1129 die("Invalid whitespace option: '%s'", p);
1130 }
1131 }
1132
1133 if (!(options.flags & REBASE_NO_QUIET))
1134 argv_array_push(&options.git_am_opts, "-q");
1135
1136 if (options.keep_empty)
1137 imply_interactive(&options, "--keep-empty");
1138
1139 if (gpg_sign) {
1140 free(options.gpg_sign_opt);
1141 options.gpg_sign_opt = xstrfmt("-S%s", gpg_sign);
1142 }
1143
1144 if (exec.nr) {
1145 int i;
1146
1147 imply_interactive(&options, "--exec");
1148
1149 strbuf_reset(&buf);
1150 for (i = 0; i < exec.nr; i++)
1151 strbuf_addf(&buf, "exec %s\n", exec.items[i].string);
1152 options.cmd = xstrdup(buf.buf);
1153 }
1154
1155 if (rebase_merges) {
1156 if (!*rebase_merges)
1157 ; /* default mode; do nothing */
1158 else if (!strcmp("rebase-cousins", rebase_merges))
1159 options.rebase_cousins = 1;
1160 else if (strcmp("no-rebase-cousins", rebase_merges))
1161 die(_("Unknown mode: %s"), rebase_merges);
1162 options.rebase_merges = 1;
1163 imply_interactive(&options, "--rebase-merges");
1164 }
1165
1166 if (strategy_options.nr) {
1167 int i;
1168
1169 if (!options.strategy)
1170 options.strategy = "recursive";
1171
1172 strbuf_reset(&buf);
1173 for (i = 0; i < strategy_options.nr; i++)
1174 strbuf_addf(&buf, " --%s",
1175 strategy_options.items[i].string);
1176 options.strategy_opts = xstrdup(buf.buf);
1177 }
1178
1179 if (options.strategy) {
1180 options.strategy = xstrdup(options.strategy);
1181 switch (options.type) {
1182 case REBASE_AM:
1183 die(_("--strategy requires --merge or --interactive"));
1184 case REBASE_MERGE:
1185 case REBASE_INTERACTIVE:
1186 case REBASE_PRESERVE_MERGES:
1187 /* compatible */
1188 break;
1189 case REBASE_UNSPECIFIED:
1190 options.type = REBASE_MERGE;
1191 break;
1192 default:
1193 BUG("unhandled rebase type (%d)", options.type);
1194 }
1195 }
1196
1197 if (options.root && !options.onto_name)
1198 imply_interactive(&options, "--root without --onto");
1199
1200 if (isatty(2) && options.flags & REBASE_NO_QUIET)
1201 strbuf_addstr(&options.git_format_patch_opt, " --progress");
1202
1203 switch (options.type) {
1204 case REBASE_MERGE:
1205 case REBASE_INTERACTIVE:
1206 case REBASE_PRESERVE_MERGES:
1207 options.state_dir = merge_dir();
1208 break;
1209 case REBASE_AM:
1210 options.state_dir = apply_dir();
1211 break;
1212 default:
1213 /* the default rebase backend is `--am` */
1214 options.type = REBASE_AM;
1215 options.state_dir = apply_dir();
1216 break;
1217 }
1218
1219 if (options.git_am_opts.argc) {
1220 /* all am options except -q are compatible only with --am */
1221 for (i = options.git_am_opts.argc - 1; i >= 0; i--)
1222 if (strcmp(options.git_am_opts.argv[i], "-q"))
1223 break;
1224
1225 if (is_interactive(&options) && i >= 0)
1226 die(_("error: cannot combine interactive options "
1227 "(--interactive, --exec, --rebase-merges, "
1228 "--preserve-merges, --keep-empty, --root + "
1229 "--onto) with am options (%s)"), buf.buf);
1230 if (options.type == REBASE_MERGE && i >= 0)
1231 die(_("error: cannot combine merge options (--merge, "
1232 "--strategy, --strategy-option) with am options "
1233 "(%s)"), buf.buf);
1234 }
1235
1236 if (options.signoff) {
1237 if (options.type == REBASE_PRESERVE_MERGES)
1238 die("cannot combine '--signoff' with "
1239 "'--preserve-merges'");
1240 argv_array_push(&options.git_am_opts, "--signoff");
1241 options.flags |= REBASE_FORCE;
1242 }
1243
1244 if (options.type == REBASE_PRESERVE_MERGES)
1245 /*
1246 * Note: incompatibility with --signoff handled in signoff block above
1247 * Note: incompatibility with --interactive is just a strong warning;
1248 * git-rebase.txt caveats with "unless you know what you are doing"
1249 */
1250 if (options.rebase_merges)
1251 die(_("error: cannot combine '--preserve-merges' with "
1252 "'--rebase-merges'"));
1253
1254 if (options.rebase_merges) {
1255 if (strategy_options.nr)
1256 die(_("error: cannot combine '--rebase-merges' with "
1257 "'--strategy-option'"));
1258 if (options.strategy)
1259 die(_("error: cannot combine '--rebase-merges' with "
1260 "'--strategy'"));
1261 }
1262
1263 if (!options.root) {
1264 if (argc < 1) {
1265 struct branch *branch;
1266
1267 branch = branch_get(NULL);
1268 options.upstream_name = branch_get_upstream(branch,
1269 NULL);
1270 if (!options.upstream_name)
1271 error_on_missing_default_upstream();
1272 if (fork_point < 0)
1273 fork_point = 1;
1274 } else {
1275 options.upstream_name = argv[0];
1276 argc--;
1277 argv++;
1278 if (!strcmp(options.upstream_name, "-"))
1279 options.upstream_name = "@{-1}";
1280 }
1281 options.upstream = peel_committish(options.upstream_name);
1282 if (!options.upstream)
1283 die(_("invalid upstream '%s'"), options.upstream_name);
1284 options.upstream_arg = options.upstream_name;
1285 } else {
1286 if (!options.onto_name) {
1287 if (commit_tree("", 0, the_hash_algo->empty_tree, NULL,
1288 &squash_onto, NULL, NULL) < 0)
1289 die(_("Could not create new root commit"));
1290 options.squash_onto = &squash_onto;
1291 options.onto_name = squash_onto_name =
1292 xstrdup(oid_to_hex(&squash_onto));
1293 }
1294 options.upstream_name = NULL;
1295 options.upstream = NULL;
1296 if (argc > 1)
1297 usage_with_options(builtin_rebase_usage,
1298 builtin_rebase_options);
1299 options.upstream_arg = "--root";
1300 }
1301
1302 /* Make sure the branch to rebase onto is valid. */
1303 if (!options.onto_name)
1304 options.onto_name = options.upstream_name;
1305 if (strstr(options.onto_name, "...")) {
1306 if (get_oid_mb(options.onto_name, &merge_base) < 0)
1307 die(_("'%s': need exactly one merge base"),
1308 options.onto_name);
1309 options.onto = lookup_commit_or_die(&merge_base,
1310 options.onto_name);
1311 } else {
1312 options.onto = peel_committish(options.onto_name);
1313 if (!options.onto)
1314 die(_("Does not point to a valid commit '%s'"),
1315 options.onto_name);
1316 }
1317
1318 /*
1319 * If the branch to rebase is given, that is the branch we will rebase
1320 * branch_name -- branch/commit being rebased, or
1321 * HEAD (already detached)
1322 * orig_head -- commit object name of tip of the branch before rebasing
1323 * head_name -- refs/heads/<that-branch> or NULL (detached HEAD)
1324 */
1325 if (argc == 1) {
1326 /* Is it "rebase other branchname" or "rebase other commit"? */
1327 branch_name = argv[0];
1328 options.switch_to = argv[0];
1329
1330 /* Is it a local branch? */
1331 strbuf_reset(&buf);
1332 strbuf_addf(&buf, "refs/heads/%s", branch_name);
1333 if (!read_ref(buf.buf, &options.orig_head))
1334 options.head_name = xstrdup(buf.buf);
1335 /* If not is it a valid ref (branch or commit)? */
1336 else if (!get_oid(branch_name, &options.orig_head))
1337 options.head_name = NULL;
1338 else
1339 die(_("fatal: no such branch/commit '%s'"),
1340 branch_name);
1341 } else if (argc == 0) {
1342 /* Do not need to switch branches, we are already on it. */
1343 options.head_name =
1344 xstrdup_or_null(resolve_ref_unsafe("HEAD", 0, NULL,
1345 &flags));
1346 if (!options.head_name)
1347 die(_("No such ref: %s"), "HEAD");
1348 if (flags & REF_ISSYMREF) {
1349 if (!skip_prefix(options.head_name,
1350 "refs/heads/", &branch_name))
1351 branch_name = options.head_name;
1352
1353 } else {
1354 free(options.head_name);
1355 options.head_name = NULL;
1356 branch_name = "HEAD";
1357 }
1358 if (get_oid("HEAD", &options.orig_head))
1359 die(_("Could not resolve HEAD to a revision"));
1360 } else
1361 BUG("unexpected number of arguments left to parse");
1362
1363 if (fork_point > 0) {
1364 struct commit *head =
1365 lookup_commit_reference(the_repository,
1366 &options.orig_head);
1367 options.restrict_revision =
1368 get_fork_point(options.upstream_name, head);
1369 }
1370
1371 if (read_index(the_repository->index) < 0)
1372 die(_("could not read index"));
1373
1374 if (options.autostash) {
1375 struct lock_file lock_file = LOCK_INIT;
1376 int fd;
1377
1378 fd = hold_locked_index(&lock_file, 0);
1379 refresh_cache(REFRESH_QUIET);
1380 if (0 <= fd)
1381 update_index_if_able(&the_index, &lock_file);
1382 rollback_lock_file(&lock_file);
1383
1384 if (has_unstaged_changes(1) || has_uncommitted_changes(1)) {
1385 const char *autostash =
1386 state_dir_path("autostash", &options);
1387 struct child_process stash = CHILD_PROCESS_INIT;
1388 struct object_id oid;
1389 struct commit *head =
1390 lookup_commit_reference(the_repository,
1391 &options.orig_head);
1392
1393 argv_array_pushl(&stash.args,
1394 "stash", "create", "autostash", NULL);
1395 stash.git_cmd = 1;
1396 stash.no_stdin = 1;
1397 strbuf_reset(&buf);
1398 if (capture_command(&stash, &buf, GIT_MAX_HEXSZ))
1399 die(_("Cannot autostash"));
1400 strbuf_trim_trailing_newline(&buf);
1401 if (get_oid(buf.buf, &oid))
1402 die(_("Unexpected stash response: '%s'"),
1403 buf.buf);
1404 strbuf_reset(&buf);
1405 strbuf_add_unique_abbrev(&buf, &oid, DEFAULT_ABBREV);
1406
1407 if (safe_create_leading_directories_const(autostash))
1408 die(_("Could not create directory for '%s'"),
1409 options.state_dir);
1410 write_file(autostash, "%s", oid_to_hex(&oid));
1411 printf(_("Created autostash: %s\n"), buf.buf);
1412 if (reset_head(&head->object.oid, "reset --hard",
1413 NULL, RESET_HEAD_HARD, NULL, NULL) < 0)
1414 die(_("could not reset --hard"));
1415 printf(_("HEAD is now at %s"),
1416 find_unique_abbrev(&head->object.oid,
1417 DEFAULT_ABBREV));
1418 strbuf_reset(&buf);
1419 pp_commit_easy(CMIT_FMT_ONELINE, head, &buf);
1420 if (buf.len > 0)
1421 printf(" %s", buf.buf);
1422 putchar('\n');
1423
1424 if (discard_index(the_repository->index) < 0 ||
1425 read_index(the_repository->index) < 0)
1426 die(_("could not read index"));
1427 }
1428 }
1429
1430 if (require_clean_work_tree("rebase",
1431 _("Please commit or stash them."), 1, 1)) {
1432 ret = 1;
1433 goto cleanup;
1434 }
1435
1436 /*
1437 * Now we are rebasing commits upstream..orig_head (or with --root,
1438 * everything leading up to orig_head) on top of onto.
1439 */
1440
1441 /*
1442 * Check if we are already based on onto with linear history,
1443 * but this should be done only when upstream and onto are the same
1444 * and if this is not an interactive rebase.
1445 */
1446 if (can_fast_forward(options.onto, &options.orig_head, &merge_base) &&
1447 !is_interactive(&options) && !options.restrict_revision &&
1448 options.upstream &&
1449 !oidcmp(&options.upstream->object.oid, &options.onto->object.oid)) {
1450 int flag;
1451
1452 if (!(options.flags & REBASE_FORCE)) {
1453 /* Lazily switch to the target branch if needed... */
1454 if (options.switch_to) {
1455 struct object_id oid;
1456
1457 if (get_oid(options.switch_to, &oid) < 0) {
1458 ret = !!error(_("could not parse '%s'"),
1459 options.switch_to);
1460 goto cleanup;
1461 }
1462
1463 strbuf_reset(&buf);
1464 strbuf_addf(&buf, "%s: checkout %s",
1465 getenv(GIT_REFLOG_ACTION_ENVIRONMENT),
1466 options.switch_to);
1467 if (reset_head(&oid, "checkout",
1468 options.head_name, 0,
1469 NULL, buf.buf) < 0) {
1470 ret = !!error(_("could not switch to "
1471 "%s"),
1472 options.switch_to);
1473 goto cleanup;
1474 }
1475 }
1476
1477 if (!(options.flags & REBASE_NO_QUIET))
1478 ; /* be quiet */
1479 else if (!strcmp(branch_name, "HEAD") &&
1480 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
1481 puts(_("HEAD is up to date."));
1482 else
1483 printf(_("Current branch %s is up to date.\n"),
1484 branch_name);
1485 ret = !!finish_rebase(&options);
1486 goto cleanup;
1487 } else if (!(options.flags & REBASE_NO_QUIET))
1488 ; /* be quiet */
1489 else if (!strcmp(branch_name, "HEAD") &&
1490 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
1491 puts(_("HEAD is up to date, rebase forced."));
1492 else
1493 printf(_("Current branch %s is up to date, rebase "
1494 "forced.\n"), branch_name);
1495 }
1496
1497 /* If a hook exists, give it a chance to interrupt*/
1498 if (!ok_to_skip_pre_rebase &&
1499 run_hook_le(NULL, "pre-rebase", options.upstream_arg,
1500 argc ? argv[0] : NULL, NULL))
1501 die(_("The pre-rebase hook refused to rebase."));
1502
1503 if (options.flags & REBASE_DIFFSTAT) {
1504 struct diff_options opts;
1505
1506 if (options.flags & REBASE_VERBOSE) {
1507 if (is_null_oid(&merge_base))
1508 printf(_("Changes to %s:\n"),
1509 oid_to_hex(&options.onto->object.oid));
1510 else
1511 printf(_("Changes from %s to %s:\n"),
1512 oid_to_hex(&merge_base),
1513 oid_to_hex(&options.onto->object.oid));
1514 }
1515
1516 /* We want color (if set), but no pager */
1517 diff_setup(&opts);
1518 opts.stat_width = -1; /* use full terminal width */
1519 opts.stat_graph_width = -1; /* respect statGraphWidth config */
1520 opts.output_format |=
1521 DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
1522 opts.detect_rename = DIFF_DETECT_RENAME;
1523 diff_setup_done(&opts);
1524 diff_tree_oid(is_null_oid(&merge_base) ?
1525 the_hash_algo->empty_tree : &merge_base,
1526 &options.onto->object.oid, "", &opts);
1527 diffcore_std(&opts);
1528 diff_flush(&opts);
1529 }
1530
1531 if (is_interactive(&options))
1532 goto run_rebase;
1533
1534 /* Detach HEAD and reset the tree */
1535 if (options.flags & REBASE_NO_QUIET)
1536 printf(_("First, rewinding head to replay your work on top of "
1537 "it...\n"));
1538
1539 strbuf_addf(&msg, "%s: checkout %s",
1540 getenv(GIT_REFLOG_ACTION_ENVIRONMENT), options.onto_name);
1541 if (reset_head(&options.onto->object.oid, "checkout", NULL,
1542 RESET_HEAD_DETACH, NULL, msg.buf))
1543 die(_("Could not detach HEAD"));
1544 strbuf_release(&msg);
1545
1546 /*
1547 * If the onto is a proper descendant of the tip of the branch, then
1548 * we just fast-forwarded.
1549 */
1550 strbuf_reset(&msg);
1551 if (!oidcmp(&merge_base, &options.orig_head)) {
1552 printf(_("Fast-forwarded %s to %s.\n"),
1553 branch_name, options.onto_name);
1554 strbuf_addf(&msg, "rebase finished: %s onto %s",
1555 options.head_name ? options.head_name : "detached HEAD",
1556 oid_to_hex(&options.onto->object.oid));
1557 reset_head(NULL, "Fast-forwarded", options.head_name, 0,
1558 "HEAD", msg.buf);
1559 strbuf_release(&msg);
1560 ret = !!finish_rebase(&options);
1561 goto cleanup;
1562 }
1563
1564 strbuf_addf(&revisions, "%s..%s",
1565 options.root ? oid_to_hex(&options.onto->object.oid) :
1566 (options.restrict_revision ?
1567 oid_to_hex(&options.restrict_revision->object.oid) :
1568 oid_to_hex(&options.upstream->object.oid)),
1569 oid_to_hex(&options.orig_head));
1570
1571 options.revisions = revisions.buf;
1572
1573 run_rebase:
1574 ret = !!run_specific_rebase(&options);
1575
1576 cleanup:
1577 strbuf_release(&revisions);
1578 free(options.head_name);
1579 free(options.gpg_sign_opt);
1580 free(options.cmd);
1581 free(squash_onto_name);
1582 return ret;
1583 }