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Commit | Line | Data |
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782c2d65 DB |
1 | #include "cache.h" |
2 | #include "builtin.h" | |
3 | #include "parse-options.h" | |
4 | #include "refs.h" | |
5 | #include "commit.h" | |
6 | #include "tree.h" | |
7 | #include "tree-walk.h" | |
b9d37a54 | 8 | #include "cache-tree.h" |
782c2d65 DB |
9 | #include "unpack-trees.h" |
10 | #include "dir.h" | |
11 | #include "run-command.h" | |
12 | #include "merge-recursive.h" | |
13 | #include "branch.h" | |
14 | #include "diff.h" | |
15 | #include "revision.h" | |
79a1e6b4 | 16 | #include "remote.h" |
0cf8581e JH |
17 | #include "blob.h" |
18 | #include "xdiff-interface.h" | |
19 | #include "ll-merge.h" | |
cfc5789a | 20 | #include "resolve-undo.h" |
175f6e59 | 21 | #include "submodule.h" |
782c2d65 DB |
22 | |
23 | static const char * const checkout_usage[] = { | |
24 | "git checkout [options] <branch>", | |
25 | "git checkout [options] [<branch>] -- <file>...", | |
26 | NULL, | |
27 | }; | |
28 | ||
db941099 JH |
29 | struct checkout_opts { |
30 | int quiet; | |
31 | int merge; | |
32 | int force; | |
38901a48 | 33 | int writeout_stage; |
db941099 JH |
34 | int writeout_error; |
35 | ||
02ac9837 TRC |
36 | /* not set by parse_options */ |
37 | int branch_exists; | |
38 | ||
db941099 | 39 | const char *new_branch; |
02ac9837 | 40 | const char *new_branch_force; |
9db5ebf4 | 41 | const char *new_orphan_branch; |
db941099 JH |
42 | int new_branch_log; |
43 | enum branch_track track; | |
175f6e59 | 44 | struct diff_options diff_options; |
db941099 JH |
45 | }; |
46 | ||
782c2d65 DB |
47 | static int post_checkout_hook(struct commit *old, struct commit *new, |
48 | int changed) | |
49 | { | |
ae98a008 SB |
50 | return run_hook(NULL, "post-checkout", |
51 | sha1_to_hex(old ? old->object.sha1 : null_sha1), | |
52 | sha1_to_hex(new ? new->object.sha1 : null_sha1), | |
53 | changed ? "1" : "0", NULL); | |
2292ce47 SB |
54 | /* "new" can be NULL when checking out from the index before |
55 | a commit exists. */ | |
ae98a008 | 56 | |
782c2d65 DB |
57 | } |
58 | ||
59 | static int update_some(const unsigned char *sha1, const char *base, int baselen, | |
671f0707 | 60 | const char *pathname, unsigned mode, int stage, void *context) |
782c2d65 DB |
61 | { |
62 | int len; | |
63 | struct cache_entry *ce; | |
64 | ||
782c2d65 DB |
65 | if (S_ISDIR(mode)) |
66 | return READ_TREE_RECURSIVE; | |
67 | ||
68 | len = baselen + strlen(pathname); | |
69 | ce = xcalloc(1, cache_entry_size(len)); | |
70 | hashcpy(ce->sha1, sha1); | |
71 | memcpy(ce->name, base, baselen); | |
72 | memcpy(ce->name + baselen, pathname, len - baselen); | |
73 | ce->ce_flags = create_ce_flags(len, 0); | |
74 | ce->ce_mode = create_ce_mode(mode); | |
75 | add_cache_entry(ce, ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE); | |
76 | return 0; | |
77 | } | |
78 | ||
79 | static int read_tree_some(struct tree *tree, const char **pathspec) | |
80 | { | |
671f0707 | 81 | read_tree_recursive(tree, "", 0, 0, pathspec, update_some, NULL); |
782c2d65 | 82 | |
782c2d65 DB |
83 | /* update the index with the given tree's info |
84 | * for all args, expanding wildcards, and exit | |
85 | * with any non-zero return code. | |
86 | */ | |
87 | return 0; | |
88 | } | |
89 | ||
8fdcf312 JH |
90 | static int skip_same_name(struct cache_entry *ce, int pos) |
91 | { | |
92 | while (++pos < active_nr && | |
93 | !strcmp(active_cache[pos]->name, ce->name)) | |
94 | ; /* skip */ | |
95 | return pos; | |
96 | } | |
97 | ||
38901a48 JH |
98 | static int check_stage(int stage, struct cache_entry *ce, int pos) |
99 | { | |
100 | while (pos < active_nr && | |
101 | !strcmp(active_cache[pos]->name, ce->name)) { | |
102 | if (ce_stage(active_cache[pos]) == stage) | |
103 | return 0; | |
104 | pos++; | |
105 | } | |
106 | return error("path '%s' does not have %s version", | |
107 | ce->name, | |
108 | (stage == 2) ? "our" : "their"); | |
109 | } | |
110 | ||
0cf8581e JH |
111 | static int check_all_stages(struct cache_entry *ce, int pos) |
112 | { | |
113 | if (ce_stage(ce) != 1 || | |
114 | active_nr <= pos + 2 || | |
115 | strcmp(active_cache[pos+1]->name, ce->name) || | |
116 | ce_stage(active_cache[pos+1]) != 2 || | |
117 | strcmp(active_cache[pos+2]->name, ce->name) || | |
118 | ce_stage(active_cache[pos+2]) != 3) | |
119 | return error("path '%s' does not have all three versions", | |
120 | ce->name); | |
121 | return 0; | |
122 | } | |
123 | ||
38901a48 JH |
124 | static int checkout_stage(int stage, struct cache_entry *ce, int pos, |
125 | struct checkout *state) | |
126 | { | |
127 | while (pos < active_nr && | |
128 | !strcmp(active_cache[pos]->name, ce->name)) { | |
129 | if (ce_stage(active_cache[pos]) == stage) | |
130 | return checkout_entry(active_cache[pos], state, NULL); | |
131 | pos++; | |
132 | } | |
133 | return error("path '%s' does not have %s version", | |
134 | ce->name, | |
135 | (stage == 2) ? "our" : "their"); | |
136 | } | |
8fdcf312 | 137 | |
0cf8581e JH |
138 | static int checkout_merged(int pos, struct checkout *state) |
139 | { | |
140 | struct cache_entry *ce = active_cache[pos]; | |
141 | const char *path = ce->name; | |
142 | mmfile_t ancestor, ours, theirs; | |
143 | int status; | |
144 | unsigned char sha1[20]; | |
145 | mmbuffer_t result_buf; | |
146 | ||
147 | if (ce_stage(ce) != 1 || | |
148 | active_nr <= pos + 2 || | |
149 | strcmp(active_cache[pos+1]->name, path) || | |
150 | ce_stage(active_cache[pos+1]) != 2 || | |
151 | strcmp(active_cache[pos+2]->name, path) || | |
152 | ce_stage(active_cache[pos+2]) != 3) | |
153 | return error("path '%s' does not have all 3 versions", path); | |
154 | ||
06b65939 ML |
155 | read_mmblob(&ancestor, active_cache[pos]->sha1); |
156 | read_mmblob(&ours, active_cache[pos+1]->sha1); | |
157 | read_mmblob(&theirs, active_cache[pos+2]->sha1); | |
0cf8581e | 158 | |
18b037a5 JN |
159 | /* |
160 | * NEEDSWORK: re-create conflicts from merges with | |
161 | * merge.renormalize set, too | |
162 | */ | |
f0531a29 | 163 | status = ll_merge(&result_buf, path, &ancestor, "base", |
6d6f9acc | 164 | &ours, "ours", &theirs, "theirs", 0); |
0cf8581e JH |
165 | free(ancestor.ptr); |
166 | free(ours.ptr); | |
167 | free(theirs.ptr); | |
168 | if (status < 0 || !result_buf.ptr) { | |
169 | free(result_buf.ptr); | |
170 | return error("path '%s': cannot merge", path); | |
171 | } | |
172 | ||
173 | /* | |
174 | * NEEDSWORK: | |
175 | * There is absolutely no reason to write this as a blob object | |
3ea3c215 | 176 | * and create a phony cache entry just to leak. This hack is |
0cf8581e JH |
177 | * primarily to get to the write_entry() machinery that massages |
178 | * the contents to work-tree format and writes out which only | |
179 | * allows it for a cache entry. The code in write_entry() needs | |
180 | * to be refactored to allow us to feed a <buffer, size, mode> | |
181 | * instead of a cache entry. Such a refactoring would help | |
182 | * merge_recursive as well (it also writes the merge result to the | |
183 | * object database even when it may contain conflicts). | |
184 | */ | |
185 | if (write_sha1_file(result_buf.ptr, result_buf.size, | |
186 | blob_type, sha1)) | |
187 | die("Unable to add merge result for '%s'", path); | |
188 | ce = make_cache_entry(create_ce_mode(active_cache[pos+1]->ce_mode), | |
189 | sha1, | |
190 | path, 2, 0); | |
048f2762 DP |
191 | if (!ce) |
192 | die("make_cache_entry failed for path '%s'", path); | |
0cf8581e JH |
193 | status = checkout_entry(ce, state, NULL); |
194 | return status; | |
195 | } | |
8fdcf312 | 196 | |
db941099 JH |
197 | static int checkout_paths(struct tree *source_tree, const char **pathspec, |
198 | struct checkout_opts *opts) | |
782c2d65 DB |
199 | { |
200 | int pos; | |
201 | struct checkout state; | |
202 | static char *ps_matched; | |
203 | unsigned char rev[20]; | |
204 | int flag; | |
205 | struct commit *head; | |
d2b3691b | 206 | int errs = 0; |
38901a48 | 207 | int stage = opts->writeout_stage; |
0cf8581e | 208 | int merge = opts->merge; |
75336878 DB |
209 | int newfd; |
210 | struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file)); | |
211 | ||
212 | newfd = hold_locked_index(lock_file, 1); | |
53996fe5 | 213 | if (read_cache_preload(pathspec) < 0) |
b96524f8 | 214 | return error("corrupt index file"); |
75336878 DB |
215 | |
216 | if (source_tree) | |
217 | read_tree_some(source_tree, pathspec); | |
218 | ||
782c2d65 DB |
219 | for (pos = 0; pathspec[pos]; pos++) |
220 | ; | |
221 | ps_matched = xcalloc(1, pos); | |
222 | ||
223 | for (pos = 0; pos < active_nr; pos++) { | |
224 | struct cache_entry *ce = active_cache[pos]; | |
0b50922a | 225 | match_pathspec(pathspec, ce->name, ce_namelen(ce), 0, ps_matched); |
782c2d65 DB |
226 | } |
227 | ||
228 | if (report_path_error(ps_matched, pathspec, 0)) | |
229 | return 1; | |
230 | ||
4421a823 JH |
231 | /* "checkout -m path" to recreate conflicted state */ |
232 | if (opts->merge) | |
233 | unmerge_cache(pathspec); | |
234 | ||
8fdcf312 JH |
235 | /* Any unmerged paths? */ |
236 | for (pos = 0; pos < active_nr; pos++) { | |
237 | struct cache_entry *ce = active_cache[pos]; | |
0b50922a | 238 | if (match_pathspec(pathspec, ce->name, ce_namelen(ce), 0, NULL)) { |
8fdcf312 JH |
239 | if (!ce_stage(ce)) |
240 | continue; | |
db941099 JH |
241 | if (opts->force) { |
242 | warning("path '%s' is unmerged", ce->name); | |
38901a48 JH |
243 | } else if (stage) { |
244 | errs |= check_stage(stage, ce, pos); | |
0cf8581e JH |
245 | } else if (opts->merge) { |
246 | errs |= check_all_stages(ce, pos); | |
db941099 JH |
247 | } else { |
248 | errs = 1; | |
249 | error("path '%s' is unmerged", ce->name); | |
250 | } | |
8fdcf312 JH |
251 | pos = skip_same_name(ce, pos) - 1; |
252 | } | |
253 | } | |
254 | if (errs) | |
255 | return 1; | |
256 | ||
d2b3691b | 257 | /* Now we are committed to check them out */ |
782c2d65 DB |
258 | memset(&state, 0, sizeof(state)); |
259 | state.force = 1; | |
260 | state.refresh_cache = 1; | |
261 | for (pos = 0; pos < active_nr; pos++) { | |
262 | struct cache_entry *ce = active_cache[pos]; | |
0b50922a | 263 | if (match_pathspec(pathspec, ce->name, ce_namelen(ce), 0, NULL)) { |
8fdcf312 JH |
264 | if (!ce_stage(ce)) { |
265 | errs |= checkout_entry(ce, &state, NULL); | |
266 | continue; | |
267 | } | |
38901a48 JH |
268 | if (stage) |
269 | errs |= checkout_stage(stage, ce, pos, &state); | |
0cf8581e JH |
270 | else if (merge) |
271 | errs |= checkout_merged(pos, &state); | |
8fdcf312 | 272 | pos = skip_same_name(ce, pos) - 1; |
782c2d65 DB |
273 | } |
274 | } | |
275 | ||
75336878 DB |
276 | if (write_cache(newfd, active_cache, active_nr) || |
277 | commit_locked_index(lock_file)) | |
278 | die("unable to write new index file"); | |
279 | ||
782c2d65 DB |
280 | resolve_ref("HEAD", rev, 0, &flag); |
281 | head = lookup_commit_reference_gently(rev, 1); | |
282 | ||
d2b3691b JH |
283 | errs |= post_checkout_hook(head, head, 0); |
284 | return errs; | |
782c2d65 DB |
285 | } |
286 | ||
175f6e59 | 287 | static void show_local_changes(struct object *head, struct diff_options *opts) |
782c2d65 DB |
288 | { |
289 | struct rev_info rev; | |
290 | /* I think we want full paths, even if we're in a subdirectory. */ | |
291 | init_revisions(&rev, NULL); | |
175f6e59 | 292 | rev.diffopt.flags = opts->flags; |
782c2d65 | 293 | rev.diffopt.output_format |= DIFF_FORMAT_NAME_STATUS; |
e752f4bb KC |
294 | if (diff_setup_done(&rev.diffopt) < 0) |
295 | die("diff_setup_done failed"); | |
782c2d65 DB |
296 | add_pending_object(&rev, head, NULL); |
297 | run_diff_index(&rev, 0); | |
298 | } | |
299 | ||
300 | static void describe_detached_head(char *msg, struct commit *commit) | |
301 | { | |
f285a2d7 | 302 | struct strbuf sb = STRBUF_INIT; |
dd2e794a | 303 | struct pretty_print_context ctx = {0}; |
782c2d65 | 304 | parse_commit(commit); |
dd2e794a | 305 | pretty_print_commit(CMIT_FMT_ONELINE, commit, &sb, &ctx); |
782c2d65 DB |
306 | fprintf(stderr, "%s %s... %s\n", msg, |
307 | find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV), sb.buf); | |
308 | strbuf_release(&sb); | |
309 | } | |
310 | ||
6286a08d | 311 | static int reset_tree(struct tree *tree, struct checkout_opts *o, int worktree) |
782c2d65 DB |
312 | { |
313 | struct unpack_trees_options opts; | |
314 | struct tree_desc tree_desc; | |
bc052d7f | 315 | |
782c2d65 DB |
316 | memset(&opts, 0, sizeof(opts)); |
317 | opts.head_idx = -1; | |
6286a08d JH |
318 | opts.update = worktree; |
319 | opts.skip_unmerged = !worktree; | |
782c2d65 DB |
320 | opts.reset = 1; |
321 | opts.merge = 1; | |
322 | opts.fn = oneway_merge; | |
6286a08d | 323 | opts.verbose_update = !o->quiet; |
34110cd4 LT |
324 | opts.src_index = &the_index; |
325 | opts.dst_index = &the_index; | |
782c2d65 DB |
326 | parse_tree(tree); |
327 | init_tree_desc(&tree_desc, tree->buffer, tree->size); | |
291d823e JH |
328 | switch (unpack_trees(1, &tree_desc, &opts)) { |
329 | case -2: | |
330 | o->writeout_error = 1; | |
331 | /* | |
332 | * We return 0 nevertheless, as the index is all right | |
333 | * and more importantly we have made best efforts to | |
334 | * update paths in the work tree, and we cannot revert | |
335 | * them. | |
336 | */ | |
337 | case 0: | |
338 | return 0; | |
339 | default: | |
84a5750b | 340 | return 128; |
291d823e | 341 | } |
782c2d65 DB |
342 | } |
343 | ||
782c2d65 DB |
344 | struct branch_info { |
345 | const char *name; /* The short name used */ | |
346 | const char *path; /* The full name of a real branch */ | |
347 | struct commit *commit; /* The named commit */ | |
348 | }; | |
349 | ||
350 | static void setup_branch_path(struct branch_info *branch) | |
351 | { | |
f285a2d7 | 352 | struct strbuf buf = STRBUF_INIT; |
ae5a6c36 | 353 | |
a552de75 JH |
354 | strbuf_branchname(&buf, branch->name); |
355 | if (strcmp(buf.buf, branch->name)) | |
ae5a6c36 | 356 | branch->name = xstrdup(buf.buf); |
a552de75 | 357 | strbuf_splice(&buf, 0, 0, "refs/heads/", 11); |
782c2d65 DB |
358 | branch->path = strbuf_detach(&buf, NULL); |
359 | } | |
360 | ||
361 | static int merge_working_tree(struct checkout_opts *opts, | |
75ea38df | 362 | struct branch_info *old, struct branch_info *new) |
782c2d65 DB |
363 | { |
364 | int ret; | |
365 | struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file)); | |
366 | int newfd = hold_locked_index(lock_file, 1); | |
b96524f8 | 367 | |
53996fe5 | 368 | if (read_cache_preload(NULL) < 0) |
b96524f8 | 369 | return error("corrupt index file"); |
782c2d65 | 370 | |
cfc5789a | 371 | resolve_undo_clear(); |
782c2d65 | 372 | if (opts->force) { |
6286a08d | 373 | ret = reset_tree(new->commit->tree, opts, 1); |
782c2d65 DB |
374 | if (ret) |
375 | return ret; | |
376 | } else { | |
377 | struct tree_desc trees[2]; | |
378 | struct tree *tree; | |
379 | struct unpack_trees_options topts; | |
bc052d7f | 380 | |
782c2d65 DB |
381 | memset(&topts, 0, sizeof(topts)); |
382 | topts.head_idx = -1; | |
34110cd4 LT |
383 | topts.src_index = &the_index; |
384 | topts.dst_index = &the_index; | |
782c2d65 | 385 | |
e294030f | 386 | setup_unpack_trees_porcelain(&topts, "checkout"); |
8ccba008 | 387 | |
782c2d65 DB |
388 | refresh_cache(REFRESH_QUIET); |
389 | ||
390 | if (unmerged_cache()) { | |
04c9e11f JH |
391 | error("you need to resolve your current index first"); |
392 | return 1; | |
782c2d65 | 393 | } |
04c9e11f JH |
394 | |
395 | /* 2-way merge to the new branch */ | |
fa7b3c2f | 396 | topts.initial_checkout = is_cache_unborn(); |
04c9e11f JH |
397 | topts.update = 1; |
398 | topts.merge = 1; | |
64da3ae5 | 399 | topts.gently = opts->merge && old->commit; |
04c9e11f JH |
400 | topts.verbose_update = !opts->quiet; |
401 | topts.fn = twoway_merge; | |
402 | topts.dir = xcalloc(1, sizeof(*topts.dir)); | |
7c4c97c0 | 403 | topts.dir->flags |= DIR_SHOW_IGNORED; |
04c9e11f | 404 | topts.dir->exclude_per_dir = ".gitignore"; |
cc580af8 JK |
405 | tree = parse_tree_indirect(old->commit ? |
406 | old->commit->object.sha1 : | |
407 | (unsigned char *)EMPTY_TREE_SHA1_BIN); | |
04c9e11f JH |
408 | init_tree_desc(&trees[0], tree->buffer, tree->size); |
409 | tree = parse_tree_indirect(new->commit->object.sha1); | |
410 | init_tree_desc(&trees[1], tree->buffer, tree->size); | |
411 | ||
291d823e | 412 | ret = unpack_trees(2, trees, &topts); |
49d833dc | 413 | if (ret == -1) { |
782c2d65 DB |
414 | /* |
415 | * Unpack couldn't do a trivial merge; either | |
416 | * give up or do a real merge, depending on | |
417 | * whether the merge flag was used. | |
418 | */ | |
419 | struct tree *result; | |
420 | struct tree *work; | |
8a2fce18 | 421 | struct merge_options o; |
782c2d65 DB |
422 | if (!opts->merge) |
423 | return 1; | |
64da3ae5 JH |
424 | |
425 | /* | |
426 | * Without old->commit, the below is the same as | |
427 | * the two-tree unpack we already tried and failed. | |
428 | */ | |
429 | if (!old->commit) | |
430 | return 1; | |
782c2d65 DB |
431 | |
432 | /* Do more real merge */ | |
433 | ||
434 | /* | |
435 | * We update the index fully, then write the | |
436 | * tree from the index, then merge the new | |
437 | * branch with the current tree, with the old | |
438 | * branch as the base. Then we reset the index | |
439 | * (but not the working tree) to the new | |
440 | * branch, leaving the working tree as the | |
441 | * merged version, but skipping unmerged | |
442 | * entries in the index. | |
443 | */ | |
444 | ||
7ae02a30 | 445 | add_files_to_cache(NULL, NULL, 0); |
7610fa57 JN |
446 | /* |
447 | * NEEDSWORK: carrying over local changes | |
448 | * when branches have different end-of-line | |
449 | * normalization (or clean+smudge rules) is | |
450 | * a pain; plumb in an option to set | |
451 | * o.renormalize? | |
452 | */ | |
8a2fce18 MV |
453 | init_merge_options(&o); |
454 | o.verbosity = 0; | |
455 | work = write_tree_from_memory(&o); | |
782c2d65 | 456 | |
6286a08d | 457 | ret = reset_tree(new->commit->tree, opts, 1); |
782c2d65 DB |
458 | if (ret) |
459 | return ret; | |
c4151629 | 460 | o.ancestor = old->name; |
8a2fce18 MV |
461 | o.branch1 = new->name; |
462 | o.branch2 = "local"; | |
463 | merge_trees(&o, new->commit->tree, work, | |
464 | old->commit->tree, &result); | |
6286a08d | 465 | ret = reset_tree(new->commit->tree, opts, 0); |
84a5750b JH |
466 | if (ret) |
467 | return ret; | |
782c2d65 DB |
468 | } |
469 | } | |
470 | ||
471 | if (write_cache(newfd, active_cache, active_nr) || | |
472 | commit_locked_index(lock_file)) | |
473 | die("unable to write new index file"); | |
474 | ||
7fe4a728 | 475 | if (!opts->force && !opts->quiet) |
175f6e59 | 476 | show_local_changes(&new->commit->object, &opts->diff_options); |
782c2d65 DB |
477 | |
478 | return 0; | |
479 | } | |
480 | ||
6d21bf96 | 481 | static void report_tracking(struct branch_info *new) |
79a1e6b4 | 482 | { |
6d21bf96 | 483 | struct strbuf sb = STRBUF_INIT; |
b56fca07 | 484 | struct branch *branch = branch_get(new->name); |
79a1e6b4 | 485 | |
6d21bf96 | 486 | if (!format_tracking_info(branch, &sb)) |
79a1e6b4 | 487 | return; |
6d21bf96 JH |
488 | fputs(sb.buf, stdout); |
489 | strbuf_release(&sb); | |
b0030db3 | 490 | } |
79a1e6b4 | 491 | |
13be3e31 JH |
492 | static void detach_advice(const char *old_path, const char *new_name) |
493 | { | |
494 | const char fmt[] = | |
495 | "Note: checking out '%s'.\n\n" | |
496 | "You are in 'detached HEAD' state. You can look around, make experimental\n" | |
497 | "changes and commit them, and you can discard any commits you make in this\n" | |
498 | "state without impacting any branches by performing another checkout.\n\n" | |
499 | "If you want to create a new branch to retain commits you create, you may\n" | |
500 | "do so (now or later) by using -b with the checkout command again. Example:\n\n" | |
501 | " git checkout -b new_branch_name\n\n"; | |
502 | ||
503 | fprintf(stderr, fmt, new_name); | |
504 | } | |
505 | ||
782c2d65 DB |
506 | static void update_refs_for_switch(struct checkout_opts *opts, |
507 | struct branch_info *old, | |
508 | struct branch_info *new) | |
509 | { | |
f285a2d7 | 510 | struct strbuf msg = STRBUF_INIT; |
782c2d65 DB |
511 | const char *old_desc; |
512 | if (opts->new_branch) { | |
3631bf77 EM |
513 | if (opts->new_orphan_branch) { |
514 | if (opts->new_branch_log && !log_all_ref_updates) { | |
515 | int temp; | |
157aaea5 | 516 | char log_file[PATH_MAX]; |
3631bf77 EM |
517 | char *ref_name = mkpath("refs/heads/%s", opts->new_orphan_branch); |
518 | ||
519 | temp = log_all_ref_updates; | |
520 | log_all_ref_updates = 1; | |
157aaea5 | 521 | if (log_ref_setup(ref_name, log_file, sizeof(log_file))) { |
3631bf77 EM |
522 | fprintf(stderr, "Can not do reflog for '%s'\n", |
523 | opts->new_orphan_branch); | |
524 | log_all_ref_updates = temp; | |
525 | return; | |
526 | } | |
527 | log_all_ref_updates = temp; | |
528 | } | |
529 | } | |
530 | else | |
02ac9837 TRC |
531 | create_branch(old->name, opts->new_branch, new->name, |
532 | opts->new_branch_force ? 1 : 0, | |
9db5ebf4 | 533 | opts->new_branch_log, opts->track); |
782c2d65 DB |
534 | new->name = opts->new_branch; |
535 | setup_branch_path(new); | |
536 | } | |
537 | ||
782c2d65 | 538 | old_desc = old->name; |
323e00fd | 539 | if (!old_desc && old->commit) |
782c2d65 DB |
540 | old_desc = sha1_to_hex(old->commit->object.sha1); |
541 | strbuf_addf(&msg, "checkout: moving from %s to %s", | |
323e00fd | 542 | old_desc ? old_desc : "(invalid)", new->name); |
782c2d65 DB |
543 | |
544 | if (new->path) { | |
545 | create_symref("HEAD", new->path, msg.buf); | |
546 | if (!opts->quiet) { | |
547 | if (old->path && !strcmp(new->path, old->path)) | |
714fddf2 | 548 | fprintf(stderr, "Already on '%s'\n", |
782c2d65 | 549 | new->name); |
09a0ec58 | 550 | else if (opts->new_branch) |
714fddf2 | 551 | fprintf(stderr, "Switched to%s branch '%s'\n", |
02ac9837 | 552 | opts->branch_exists ? " and reset" : " a new", |
782c2d65 | 553 | new->name); |
09a0ec58 RR |
554 | else |
555 | fprintf(stderr, "Switched to branch '%s'\n", | |
556 | new->name); | |
782c2d65 | 557 | } |
3631bf77 EM |
558 | if (old->path && old->name) { |
559 | char log_file[PATH_MAX], ref_file[PATH_MAX]; | |
560 | ||
561 | git_snpath(log_file, sizeof(log_file), "logs/%s", old->path); | |
562 | git_snpath(ref_file, sizeof(ref_file), "%s", old->path); | |
563 | if (!file_exists(ref_file) && file_exists(log_file)) | |
564 | remove_path(log_file); | |
565 | } | |
782c2d65 DB |
566 | } else if (strcmp(new->name, "HEAD")) { |
567 | update_ref(msg.buf, "HEAD", new->commit->object.sha1, NULL, | |
568 | REF_NODEREF, DIE_ON_ERR); | |
569 | if (!opts->quiet) { | |
13be3e31 JH |
570 | if (old->path && advice_detached_head) |
571 | detach_advice(old->path, new->name); | |
782c2d65 DB |
572 | describe_detached_head("HEAD is now at", new->commit); |
573 | } | |
574 | } | |
575 | remove_branch_state(); | |
576 | strbuf_release(&msg); | |
b0030db3 | 577 | if (!opts->quiet && (new->path || !strcmp(new->name, "HEAD"))) |
6d21bf96 | 578 | report_tracking(new); |
782c2d65 DB |
579 | } |
580 | ||
75ea38df | 581 | static int switch_branches(struct checkout_opts *opts, struct branch_info *new) |
782c2d65 DB |
582 | { |
583 | int ret = 0; | |
584 | struct branch_info old; | |
585 | unsigned char rev[20]; | |
586 | int flag; | |
587 | memset(&old, 0, sizeof(old)); | |
588 | old.path = resolve_ref("HEAD", rev, 0, &flag); | |
589 | old.commit = lookup_commit_reference_gently(rev, 1); | |
590 | if (!(flag & REF_ISSYMREF)) | |
591 | old.path = NULL; | |
592 | ||
593 | if (old.path && !prefixcmp(old.path, "refs/heads/")) | |
594 | old.name = old.path + strlen("refs/heads/"); | |
595 | ||
596 | if (!new->name) { | |
597 | new->name = "HEAD"; | |
598 | new->commit = old.commit; | |
599 | if (!new->commit) | |
600 | die("You are on a branch yet to be born"); | |
601 | parse_commit(new->commit); | |
602 | } | |
603 | ||
75ea38df | 604 | ret = merge_working_tree(opts, &old, new); |
782c2d65 DB |
605 | if (ret) |
606 | return ret; | |
607 | ||
77ebd56d DC |
608 | /* |
609 | * If we were on a detached HEAD, but have now moved to | |
610 | * a new commit, we want to mention the old commit once more | |
611 | * to remind the user that it might be lost. | |
612 | */ | |
613 | if (!opts->quiet && !old.path && old.commit && new->commit != old.commit) | |
614 | describe_detached_head("Previous HEAD position was", old.commit); | |
615 | ||
782c2d65 DB |
616 | update_refs_for_switch(opts, &old, new); |
617 | ||
291d823e JH |
618 | ret = post_checkout_hook(old.commit, new->commit, 1); |
619 | return ret || opts->writeout_error; | |
782c2d65 DB |
620 | } |
621 | ||
0cf8581e JH |
622 | static int git_checkout_config(const char *var, const char *value, void *cb) |
623 | { | |
175f6e59 JS |
624 | if (!strcmp(var, "diff.ignoresubmodules")) { |
625 | struct checkout_opts *opts = cb; | |
626 | handle_ignore_submodules_arg(&opts->diff_options, value); | |
627 | return 0; | |
628 | } | |
23b4c7bc JL |
629 | |
630 | if (!prefixcmp(var, "submodule.")) | |
631 | return parse_submodule_config_option(var, value); | |
632 | ||
175f6e59 | 633 | return git_xmerge_config(var, value, NULL); |
0cf8581e JH |
634 | } |
635 | ||
4f353658 TR |
636 | static int interactive_checkout(const char *revision, const char **pathspec, |
637 | struct checkout_opts *opts) | |
638 | { | |
639 | return run_add_interactive(revision, "--patch=checkout", pathspec); | |
640 | } | |
641 | ||
70c9ac2f JH |
642 | struct tracking_name_data { |
643 | const char *name; | |
644 | char *remote; | |
645 | int unique; | |
646 | }; | |
647 | ||
648 | static int check_tracking_name(const char *refname, const unsigned char *sha1, | |
649 | int flags, void *cb_data) | |
650 | { | |
651 | struct tracking_name_data *cb = cb_data; | |
652 | const char *slash; | |
653 | ||
654 | if (prefixcmp(refname, "refs/remotes/")) | |
655 | return 0; | |
656 | slash = strchr(refname + 13, '/'); | |
657 | if (!slash || strcmp(slash + 1, cb->name)) | |
658 | return 0; | |
659 | if (cb->remote) { | |
660 | cb->unique = 0; | |
661 | return 0; | |
662 | } | |
663 | cb->remote = xstrdup(refname); | |
664 | return 0; | |
665 | } | |
666 | ||
667 | static const char *unique_tracking_name(const char *name) | |
668 | { | |
66dbfd55 GV |
669 | struct tracking_name_data cb_data = { NULL, NULL, 1 }; |
670 | cb_data.name = name; | |
70c9ac2f JH |
671 | for_each_ref(check_tracking_name, &cb_data); |
672 | if (cb_data.unique) | |
673 | return cb_data.remote; | |
674 | free(cb_data.remote); | |
675 | return NULL; | |
676 | } | |
4f353658 | 677 | |
782c2d65 DB |
678 | int cmd_checkout(int argc, const char **argv, const char *prefix) |
679 | { | |
680 | struct checkout_opts opts; | |
681 | unsigned char rev[20]; | |
682 | const char *arg; | |
683 | struct branch_info new; | |
684 | struct tree *source_tree = NULL; | |
eac5a401 | 685 | char *conflict_style = NULL; |
4f353658 | 686 | int patch_mode = 0; |
46148dd7 | 687 | int dwim_new_local_branch = 1; |
782c2d65 DB |
688 | struct option options[] = { |
689 | OPT__QUIET(&opts.quiet), | |
4c688751 TRC |
690 | OPT_STRING('b', NULL, &opts.new_branch, "branch", |
691 | "create and checkout a new branch"), | |
02ac9837 TRC |
692 | OPT_STRING('B', NULL, &opts.new_branch_force, "branch", |
693 | "create/reset and checkout a branch"), | |
3695dc0a DKF |
694 | OPT_BOOLEAN('l', NULL, &opts.new_branch_log, "create reflog for new branch"), |
695 | OPT_SET_INT('t', "track", &opts.track, "set upstream info for new branch", | |
9ed36cfa | 696 | BRANCH_TRACK_EXPLICIT), |
9db5ebf4 | 697 | OPT_STRING(0, "orphan", &opts.new_orphan_branch, "new branch", "new unparented branch"), |
3695dc0a | 698 | OPT_SET_INT('2', "ours", &opts.writeout_stage, "checkout our version for unmerged files", |
38901a48 | 699 | 2), |
3695dc0a | 700 | OPT_SET_INT('3', "theirs", &opts.writeout_stage, "checkout their version for unmerged files", |
38901a48 | 701 | 3), |
3695dc0a DKF |
702 | OPT_BOOLEAN('f', "force", &opts.force, "force checkout (throw away local modifications)"), |
703 | OPT_BOOLEAN('m', "merge", &opts.merge, "perform a 3-way merge with the new branch"), | |
eac5a401 JH |
704 | OPT_STRING(0, "conflict", &conflict_style, "style", |
705 | "conflict style (merge or diff3)"), | |
4f353658 | 706 | OPT_BOOLEAN('p', "patch", &patch_mode, "select hunks interactively"), |
46148dd7 JH |
707 | { OPTION_BOOLEAN, 0, "guess", &dwim_new_local_branch, NULL, |
708 | "second guess 'git checkout no-such-branch'", | |
709 | PARSE_OPT_NOARG | PARSE_OPT_HIDDEN }, | |
b249b552 | 710 | OPT_END(), |
782c2d65 | 711 | }; |
859fdaba | 712 | int has_dash_dash; |
782c2d65 DB |
713 | |
714 | memset(&opts, 0, sizeof(opts)); | |
715 | memset(&new, 0, sizeof(new)); | |
716 | ||
23b4c7bc | 717 | gitmodules_config(); |
175f6e59 | 718 | git_config(git_checkout_config, &opts); |
782c2d65 | 719 | |
9188ed89 | 720 | opts.track = BRANCH_TRACK_UNSPECIFIED; |
782c2d65 | 721 | |
37782920 | 722 | argc = parse_options(argc, argv, prefix, options, checkout_usage, |
f5242ebf | 723 | PARSE_OPT_KEEP_DASHDASH); |
859fdaba | 724 | |
02ac9837 TRC |
725 | /* we can assume from now on new_branch = !new_branch_force */ |
726 | if (opts.new_branch && opts.new_branch_force) | |
727 | die("-B cannot be used with -b"); | |
728 | ||
729 | /* copy -B over to -b, so that we can just check the latter */ | |
730 | if (opts.new_branch_force) | |
731 | opts.new_branch = opts.new_branch_force; | |
732 | ||
4f353658 TR |
733 | if (patch_mode && (opts.track > 0 || opts.new_branch |
734 | || opts.new_branch_log || opts.merge || opts.force)) | |
735 | die ("--patch is incompatible with all other options"); | |
736 | ||
bb0ceb62 | 737 | /* --track without -b should DWIM */ |
9188ed89 AR |
738 | if (0 < opts.track && !opts.new_branch) { |
739 | const char *argv0 = argv[0]; | |
740 | if (!argc || !strcmp(argv0, "--")) | |
bb0ceb62 | 741 | die ("--track needs a branch name"); |
9188ed89 AR |
742 | if (!prefixcmp(argv0, "refs/")) |
743 | argv0 += 5; | |
744 | if (!prefixcmp(argv0, "remotes/")) | |
745 | argv0 += 8; | |
746 | argv0 = strchr(argv0, '/'); | |
747 | if (!argv0 || !argv0[1]) | |
bb0ceb62 | 748 | die ("Missing branch name; try -b"); |
9188ed89 | 749 | opts.new_branch = argv0 + 1; |
bb0ceb62 JS |
750 | } |
751 | ||
9db5ebf4 EM |
752 | if (opts.new_orphan_branch) { |
753 | if (opts.new_branch) | |
02ac9837 | 754 | die("--orphan and -b|-B are mutually exclusive"); |
3631bf77 EM |
755 | if (opts.track > 0) |
756 | die("--orphan cannot be used with -t"); | |
9db5ebf4 EM |
757 | opts.new_branch = opts.new_orphan_branch; |
758 | } | |
759 | ||
eac5a401 JH |
760 | if (conflict_style) { |
761 | opts.merge = 1; /* implied */ | |
762 | git_xmerge_config("merge.conflictstyle", conflict_style, NULL); | |
763 | } | |
764 | ||
859fdaba PH |
765 | if (opts.force && opts.merge) |
766 | die("git checkout: -f and -m are incompatible"); | |
767 | ||
768 | /* | |
769 | * case 1: git checkout <ref> -- [<paths>] | |
770 | * | |
771 | * <ref> must be a valid tree, everything after the '--' must be | |
772 | * a path. | |
773 | * | |
774 | * case 2: git checkout -- [<paths>] | |
775 | * | |
776 | * everything after the '--' must be paths. | |
777 | * | |
778 | * case 3: git checkout <something> [<paths>] | |
779 | * | |
780 | * With no paths, if <something> is a commit, that is to | |
619a644d JH |
781 | * switch to the branch or detach HEAD at it. As a special case, |
782 | * if <something> is A...B (missing A or B means HEAD but you can | |
783 | * omit at most one side), and if there is a unique merge base | |
784 | * between A and B, A...B names that merge base. | |
859fdaba | 785 | * |
70c9ac2f JH |
786 | * With no paths, if <something> is _not_ a commit, no -t nor -b |
787 | * was given, and there is a tracking branch whose name is | |
788 | * <something> in one and only one remote, then this is a short-hand | |
789 | * to fork local <something> from that remote tracking branch. | |
790 | * | |
859fdaba PH |
791 | * Otherwise <something> shall not be ambiguous. |
792 | * - If it's *only* a reference, treat it like case (1). | |
793 | * - If it's only a path, treat it like case (2). | |
794 | * - else: fail. | |
795 | * | |
796 | */ | |
782c2d65 | 797 | if (argc) { |
859fdaba PH |
798 | if (!strcmp(argv[0], "--")) { /* case (2) */ |
799 | argv++; | |
800 | argc--; | |
801 | goto no_reference; | |
802 | } | |
803 | ||
782c2d65 | 804 | arg = argv[0]; |
859fdaba PH |
805 | has_dash_dash = (argc > 1) && !strcmp(argv[1], "--"); |
806 | ||
696acf45 TR |
807 | if (!strcmp(arg, "-")) |
808 | arg = "@{-1}"; | |
809 | ||
619a644d | 810 | if (get_sha1_mb(arg, rev)) { |
859fdaba PH |
811 | if (has_dash_dash) /* case (1) */ |
812 | die("invalid reference: %s", arg); | |
70c9ac2f | 813 | if (!patch_mode && |
46148dd7 | 814 | dwim_new_local_branch && |
70c9ac2f JH |
815 | opts.track == BRANCH_TRACK_UNSPECIFIED && |
816 | !opts.new_branch && | |
817 | !check_filename(NULL, arg) && | |
818 | argc == 1) { | |
819 | const char *remote = unique_tracking_name(arg); | |
820 | if (!remote || get_sha1(remote, rev)) | |
821 | goto no_reference; | |
822 | opts.new_branch = arg; | |
823 | arg = remote; | |
824 | /* DWIMmed to create local branch */ | |
825 | } | |
826 | else | |
827 | goto no_reference; | |
859fdaba PH |
828 | } |
829 | ||
830 | /* we can't end up being in (2) anymore, eat the argument */ | |
831 | argv++; | |
832 | argc--; | |
833 | ||
3442ea4a | 834 | new.name = arg; |
859fdaba | 835 | if ((new.commit = lookup_commit_reference_gently(rev, 1))) { |
782c2d65 | 836 | setup_branch_path(&new); |
72a144e2 JH |
837 | |
838 | if ((check_ref_format(new.path) == CHECK_REF_FORMAT_OK) && | |
839 | resolve_ref(new.path, rev, 1, NULL)) | |
840 | ; | |
782c2d65 DB |
841 | else |
842 | new.path = NULL; | |
843 | parse_commit(new.commit); | |
844 | source_tree = new.commit->tree; | |
859fdaba PH |
845 | } else |
846 | source_tree = parse_tree_indirect(rev); | |
847 | ||
848 | if (!source_tree) /* case (1): want a tree */ | |
849 | die("reference is not a tree: %s", arg); | |
850 | if (!has_dash_dash) {/* case (3 -> 1) */ | |
851 | /* | |
852 | * Do not complain the most common case | |
853 | * git checkout branch | |
854 | * even if there happen to be a file called 'branch'; | |
855 | * it would be extremely annoying. | |
856 | */ | |
857 | if (argc) | |
858 | verify_non_filename(NULL, arg); | |
859 | } | |
860 | else { | |
782c2d65 DB |
861 | argv++; |
862 | argc--; | |
863 | } | |
864 | } | |
865 | ||
859fdaba | 866 | no_reference: |
70c9ac2f JH |
867 | |
868 | if (opts.track == BRANCH_TRACK_UNSPECIFIED) | |
869 | opts.track = git_branch_track; | |
870 | ||
782c2d65 DB |
871 | if (argc) { |
872 | const char **pathspec = get_pathspec(prefix, argv); | |
301e42ed AR |
873 | |
874 | if (!pathspec) | |
875 | die("invalid path specification"); | |
876 | ||
4f353658 TR |
877 | if (patch_mode) |
878 | return interactive_checkout(new.name, pathspec, &opts); | |
879 | ||
782c2d65 | 880 | /* Checkout paths */ |
0cf8581e | 881 | if (opts.new_branch) { |
782c2d65 | 882 | if (argc == 1) { |
db941099 | 883 | die("git checkout: updating paths is incompatible with switching branches.\nDid you intend to checkout '%s' which can not be resolved as commit?", argv[0]); |
782c2d65 | 884 | } else { |
db941099 | 885 | die("git checkout: updating paths is incompatible with switching branches."); |
782c2d65 DB |
886 | } |
887 | } | |
888 | ||
0cf8581e JH |
889 | if (1 < !!opts.writeout_stage + !!opts.force + !!opts.merge) |
890 | die("git checkout: --ours/--theirs, --force and --merge are incompatible when\nchecking out of the index."); | |
891 | ||
db941099 | 892 | return checkout_paths(source_tree, pathspec, &opts); |
782c2d65 DB |
893 | } |
894 | ||
4f353658 TR |
895 | if (patch_mode) |
896 | return interactive_checkout(new.name, NULL, &opts); | |
897 | ||
352eadc4 | 898 | if (opts.new_branch) { |
f285a2d7 | 899 | struct strbuf buf = STRBUF_INIT; |
a2fab531 JH |
900 | if (strbuf_check_branch_ref(&buf, opts.new_branch)) |
901 | die("git checkout: we do not like '%s' as a branch name.", | |
902 | opts.new_branch); | |
02ac9837 TRC |
903 | if (!get_sha1(buf.buf, rev)) { |
904 | opts.branch_exists = 1; | |
905 | if (!opts.new_branch_force) | |
906 | die("git checkout: branch %s already exists", | |
907 | opts.new_branch); | |
908 | } | |
352eadc4 DB |
909 | strbuf_release(&buf); |
910 | } | |
911 | ||
782c2d65 DB |
912 | if (new.name && !new.commit) { |
913 | die("Cannot switch branch to a non-commit."); | |
914 | } | |
38901a48 JH |
915 | if (opts.writeout_stage) |
916 | die("--ours/--theirs is incompatible with switching branches."); | |
782c2d65 | 917 | |
75ea38df | 918 | return switch_branches(&opts, &new); |
782c2d65 | 919 | } |