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Commit | Line | Data |
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9509af68 JS |
1 | #include "cache.h" |
2 | #include "builtin.h" | |
3 | #include "object.h" | |
4 | #include "commit.h" | |
5 | #include "tag.h" | |
6 | #include "wt-status.h" | |
7 | #include "run-command.h" | |
8 | #include "exec_cmd.h" | |
9 | #include "utf8.h" | |
f8103794 | 10 | #include "parse-options.h" |
45525bd0 | 11 | #include "cache-tree.h" |
0f2d4476 JK |
12 | #include "diff.h" |
13 | #include "revision.h" | |
9509af68 JS |
14 | |
15 | /* | |
16 | * This implements the builtins revert and cherry-pick. | |
17 | * | |
18 | * Copyright (c) 2007 Johannes E. Schindelin | |
19 | * | |
20 | * Based on git-revert.sh, which is | |
21 | * | |
22 | * Copyright (c) 2005 Linus Torvalds | |
23 | * Copyright (c) 2005 Junio C Hamano | |
24 | */ | |
25 | ||
f8103794 PH |
26 | static const char * const revert_usage[] = { |
27 | "git-revert [options] <commit-ish>", | |
28 | NULL | |
29 | }; | |
9509af68 | 30 | |
f8103794 PH |
31 | static const char * const cherry_pick_usage[] = { |
32 | "git-cherry-pick [options] <commit-ish>", | |
33 | NULL | |
34 | }; | |
9509af68 | 35 | |
cfd9c277 | 36 | static int edit, no_replay, no_commit, mainline, signoff; |
4175e9e3 | 37 | static enum { REVERT, CHERRY_PICK } action; |
9509af68 | 38 | static struct commit *commit; |
9509af68 JS |
39 | |
40 | static const char *me; | |
41 | ||
42 | #define GIT_REFLOG_ACTION "GIT_REFLOG_ACTION" | |
43 | ||
f8103794 | 44 | static void parse_args(int argc, const char **argv) |
9509af68 | 45 | { |
f8103794 PH |
46 | const char * const * usage_str = |
47 | action == REVERT ? revert_usage : cherry_pick_usage; | |
9509af68 JS |
48 | unsigned char sha1[20]; |
49 | const char *arg; | |
f8103794 PH |
50 | int noop; |
51 | struct option options[] = { | |
52 | OPT_BOOLEAN('n', "no-commit", &no_commit, "don't automatically commit"), | |
53 | OPT_BOOLEAN('e', "edit", &edit, "edit the commit message"), | |
54 | OPT_BOOLEAN('x', NULL, &no_replay, "append commit name when cherry-picking"), | |
55 | OPT_BOOLEAN('r', NULL, &noop, "no-op (backward compatibility)"), | |
cfd9c277 | 56 | OPT_BOOLEAN('s', "signoff", &signoff, "add Signed-off-by:"), |
02273fdb | 57 | OPT_INTEGER('m', "mainline", &mainline, "parent number"), |
f8103794 PH |
58 | OPT_END(), |
59 | }; | |
60 | ||
61 | if (parse_options(argc, argv, options, usage_str, 0) != 1) | |
62 | usage_with_options(usage_str, options); | |
63 | arg = argv[0]; | |
9509af68 | 64 | |
9509af68 JS |
65 | if (get_sha1(arg, sha1)) |
66 | die ("Cannot find '%s'", arg); | |
67 | commit = (struct commit *)parse_object(sha1); | |
68 | if (!commit) | |
69 | die ("Could not find %s", sha1_to_hex(sha1)); | |
70 | if (commit->object.type == OBJ_TAG) { | |
71 | commit = (struct commit *) | |
72 | deref_tag((struct object *)commit, arg, strlen(arg)); | |
9509af68 JS |
73 | } |
74 | if (commit->object.type != OBJ_COMMIT) | |
75 | die ("'%s' does not point to a commit", arg); | |
76 | } | |
77 | ||
78 | static char *get_oneline(const char *message) | |
79 | { | |
80 | char *result; | |
81 | const char *p = message, *abbrev, *eol; | |
82 | int abbrev_len, oneline_len; | |
83 | ||
84 | if (!p) | |
85 | die ("Could not read commit message of %s", | |
86 | sha1_to_hex(commit->object.sha1)); | |
87 | while (*p && (*p != '\n' || p[1] != '\n')) | |
88 | p++; | |
89 | ||
90 | if (*p) { | |
91 | p += 2; | |
92 | for (eol = p + 1; *eol && *eol != '\n'; eol++) | |
93 | ; /* do nothing */ | |
94 | } else | |
95 | eol = p; | |
96 | abbrev = find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV); | |
97 | abbrev_len = strlen(abbrev); | |
98 | oneline_len = eol - p; | |
99 | result = xmalloc(abbrev_len + 5 + oneline_len); | |
100 | memcpy(result, abbrev, abbrev_len); | |
101 | memcpy(result + abbrev_len, "... ", 4); | |
102 | memcpy(result + abbrev_len + 4, p, oneline_len); | |
103 | result[abbrev_len + 4 + oneline_len] = '\0'; | |
104 | return result; | |
105 | } | |
106 | ||
52fae7de | 107 | static char *get_encoding(const char *message) |
9509af68 JS |
108 | { |
109 | const char *p = message, *eol; | |
110 | ||
111 | if (!p) | |
112 | die ("Could not read commit message of %s", | |
113 | sha1_to_hex(commit->object.sha1)); | |
114 | while (*p && *p != '\n') { | |
115 | for (eol = p + 1; *eol && *eol != '\n'; eol++) | |
116 | ; /* do nothing */ | |
117 | if (!prefixcmp(p, "encoding ")) { | |
118 | char *result = xmalloc(eol - 8 - p); | |
119 | strlcpy(result, p + 9, eol - 8 - p); | |
120 | return result; | |
121 | } | |
122 | p = eol; | |
123 | if (*p == '\n') | |
124 | p++; | |
125 | } | |
126 | return NULL; | |
127 | } | |
128 | ||
4175e9e3 | 129 | static struct lock_file msg_file; |
9509af68 JS |
130 | static int msg_fd; |
131 | ||
132 | static void add_to_msg(const char *string) | |
133 | { | |
134 | int len = strlen(string); | |
135 | if (write_in_full(msg_fd, string, len) < 0) | |
1dcb3b64 | 136 | die ("Could not write to MERGE_MSG"); |
9509af68 JS |
137 | } |
138 | ||
139 | static void add_message_to_msg(const char *message) | |
140 | { | |
141 | const char *p = message; | |
142 | while (*p && (*p != '\n' || p[1] != '\n')) | |
143 | p++; | |
144 | ||
145 | if (!*p) | |
146 | add_to_msg(sha1_to_hex(commit->object.sha1)); | |
147 | ||
148 | p += 2; | |
149 | add_to_msg(p); | |
150 | return; | |
151 | } | |
152 | ||
153 | static void set_author_ident_env(const char *message) | |
154 | { | |
155 | const char *p = message; | |
156 | if (!p) | |
157 | die ("Could not read commit message of %s", | |
158 | sha1_to_hex(commit->object.sha1)); | |
159 | while (*p && *p != '\n') { | |
160 | const char *eol; | |
161 | ||
162 | for (eol = p; *eol && *eol != '\n'; eol++) | |
163 | ; /* do nothing */ | |
164 | if (!prefixcmp(p, "author ")) { | |
165 | char *line, *pend, *email, *timestamp; | |
166 | ||
167 | p += 7; | |
182af834 | 168 | line = xmemdupz(p, eol - p); |
9509af68 JS |
169 | email = strchr(line, '<'); |
170 | if (!email) | |
171 | die ("Could not extract author email from %s", | |
172 | sha1_to_hex(commit->object.sha1)); | |
173 | if (email == line) | |
174 | pend = line; | |
175 | else | |
176 | for (pend = email; pend != line + 1 && | |
177 | isspace(pend[-1]); pend--); | |
178 | ; /* do nothing */ | |
179 | *pend = '\0'; | |
180 | email++; | |
181 | timestamp = strchr(email, '>'); | |
182 | if (!timestamp) | |
183 | die ("Could not extract author email from %s", | |
184 | sha1_to_hex(commit->object.sha1)); | |
185 | *timestamp = '\0'; | |
186 | for (timestamp++; *timestamp && isspace(*timestamp); | |
187 | timestamp++) | |
188 | ; /* do nothing */ | |
189 | setenv("GIT_AUTHOR_NAME", line, 1); | |
190 | setenv("GIT_AUTHOR_EMAIL", email, 1); | |
191 | setenv("GIT_AUTHOR_DATE", timestamp, 1); | |
192 | free(line); | |
193 | return; | |
194 | } | |
195 | p = eol; | |
196 | if (*p == '\n') | |
197 | p++; | |
198 | } | |
199 | die ("No author information found in %s", | |
200 | sha1_to_hex(commit->object.sha1)); | |
201 | } | |
202 | ||
203 | static int merge_recursive(const char *base_sha1, | |
204 | const char *head_sha1, const char *head_name, | |
205 | const char *next_sha1, const char *next_name) | |
206 | { | |
207 | char buffer[256]; | |
497bdc88 | 208 | const char *argv[6]; |
9509af68 JS |
209 | |
210 | sprintf(buffer, "GITHEAD_%s", head_sha1); | |
211 | setenv(buffer, head_name, 1); | |
212 | sprintf(buffer, "GITHEAD_%s", next_sha1); | |
213 | setenv(buffer, next_name, 1); | |
214 | ||
215 | /* | |
216 | * This three way merge is an interesting one. We are at | |
217 | * $head, and would want to apply the change between $commit | |
218 | * and $prev on top of us (when reverting), or the change between | |
219 | * $prev and $commit on top of us (when cherry-picking or replaying). | |
220 | */ | |
497bdc88 SP |
221 | argv[0] = "merge-recursive"; |
222 | argv[1] = base_sha1; | |
223 | argv[2] = "--"; | |
224 | argv[3] = head_sha1; | |
225 | argv[4] = next_sha1; | |
226 | argv[5] = NULL; | |
227 | ||
228 | return run_command_v_opt(argv, RUN_COMMAND_NO_STDIN | RUN_GIT_CMD); | |
9509af68 JS |
229 | } |
230 | ||
804c7174 WC |
231 | static char *help_msg(const unsigned char *sha1) |
232 | { | |
233 | static char helpbuf[1024]; | |
234 | char *msg = getenv("GIT_CHERRY_PICK_HELP"); | |
235 | ||
236 | if (msg) | |
237 | return msg; | |
238 | ||
239 | strcpy(helpbuf, " After resolving the conflicts,\n" | |
240 | "mark the corrected paths with 'git add <paths>' " | |
0d813589 | 241 | "or 'git rm <paths>' and commit the result."); |
804c7174 WC |
242 | |
243 | if (action == CHERRY_PICK) { | |
244 | sprintf(helpbuf + strlen(helpbuf), | |
245 | "\nWhen commiting, use the option " | |
246 | "'-c %s' to retain authorship and message.", | |
247 | find_unique_abbrev(sha1, DEFAULT_ABBREV)); | |
248 | } | |
249 | return helpbuf; | |
250 | } | |
251 | ||
0f2d4476 JK |
252 | static int index_is_dirty(void) |
253 | { | |
254 | struct rev_info rev; | |
255 | init_revisions(&rev, NULL); | |
256 | setup_revisions(0, NULL, &rev, "HEAD"); | |
257 | DIFF_OPT_SET(&rev.diffopt, QUIET); | |
258 | DIFF_OPT_SET(&rev.diffopt, EXIT_WITH_STATUS); | |
259 | run_diff_index(&rev, 1); | |
260 | return !!DIFF_OPT_TST(&rev.diffopt, HAS_CHANGES); | |
261 | } | |
262 | ||
9509af68 JS |
263 | static int revert_or_cherry_pick(int argc, const char **argv) |
264 | { | |
265 | unsigned char head[20]; | |
7791ecbc | 266 | struct commit *base, *next, *parent; |
9509af68 | 267 | int i; |
1a8f2741 SP |
268 | char *oneline, *reencoded_message = NULL; |
269 | const char *message, *encoding; | |
abda5227 | 270 | const char *defmsg = xstrdup(git_path("MERGE_MSG")); |
9509af68 | 271 | |
ef90d6d4 | 272 | git_config(git_default_config, NULL); |
9509af68 JS |
273 | me = action == REVERT ? "revert" : "cherry-pick"; |
274 | setenv(GIT_REFLOG_ACTION, me, 0); | |
f8103794 | 275 | parse_args(argc, argv); |
9509af68 JS |
276 | |
277 | /* this is copied from the shell script, but it's never triggered... */ | |
f8103794 | 278 | if (action == REVERT && !no_replay) |
9509af68 JS |
279 | die("revert is incompatible with replay"); |
280 | ||
281 | if (no_commit) { | |
282 | /* | |
283 | * We do not intend to commit immediately. We just want to | |
71aa2b8f JH |
284 | * merge the differences in, so let's compute the tree |
285 | * that represents the "current" state for merge-recursive | |
286 | * to work on. | |
9509af68 | 287 | */ |
45525bd0 | 288 | if (write_cache_as_tree(head, 0, NULL)) |
9509af68 JS |
289 | die ("Your index file is unmerged."); |
290 | } else { | |
9509af68 JS |
291 | if (get_sha1("HEAD", head)) |
292 | die ("You do not have a valid HEAD"); | |
0f2d4476 JK |
293 | if (read_cache() < 0) |
294 | die("could not read the index"); | |
295 | if (index_is_dirty()) | |
9509af68 JS |
296 | die ("Dirty index: cannot %s", me); |
297 | discard_cache(); | |
298 | } | |
299 | ||
300 | if (!commit->parents) | |
301 | die ("Cannot %s a root commit", me); | |
7791ecbc JH |
302 | if (commit->parents->next) { |
303 | /* Reverting or cherry-picking a merge commit */ | |
304 | int cnt; | |
305 | struct commit_list *p; | |
306 | ||
307 | if (!mainline) | |
308 | die("Commit %s is a merge but no -m option was given.", | |
309 | sha1_to_hex(commit->object.sha1)); | |
310 | ||
311 | for (cnt = 1, p = commit->parents; | |
312 | cnt != mainline && p; | |
313 | cnt++) | |
314 | p = p->next; | |
315 | if (cnt != mainline || !p) | |
316 | die("Commit %s does not have parent %d", | |
317 | sha1_to_hex(commit->object.sha1), mainline); | |
318 | parent = p->item; | |
319 | } else if (0 < mainline) | |
320 | die("Mainline was specified but commit %s is not a merge.", | |
321 | sha1_to_hex(commit->object.sha1)); | |
322 | else | |
323 | parent = commit->parents->item; | |
324 | ||
9509af68 JS |
325 | if (!(message = commit->buffer)) |
326 | die ("Cannot get commit message for %s", | |
327 | sha1_to_hex(commit->object.sha1)); | |
328 | ||
329 | /* | |
330 | * "commit" is an existing commit. We would want to apply | |
331 | * the difference it introduces since its first parent "prev" | |
332 | * on top of the current HEAD if we are cherry-pick. Or the | |
333 | * reverse of it if we are revert. | |
334 | */ | |
335 | ||
abda5227 | 336 | msg_fd = hold_lock_file_for_update(&msg_file, defmsg, 1); |
9509af68 JS |
337 | |
338 | encoding = get_encoding(message); | |
339 | if (!encoding) | |
340 | encoding = "utf-8"; | |
341 | if (!git_commit_encoding) | |
342 | git_commit_encoding = "utf-8"; | |
343 | if ((reencoded_message = reencode_string(message, | |
344 | git_commit_encoding, encoding))) | |
345 | message = reencoded_message; | |
346 | ||
347 | oneline = get_oneline(message); | |
348 | ||
349 | if (action == REVERT) { | |
e43b0105 JS |
350 | char *oneline_body = strchr(oneline, ' '); |
351 | ||
9509af68 | 352 | base = commit; |
7791ecbc | 353 | next = parent; |
e43b0105 JS |
354 | add_to_msg("Revert \""); |
355 | add_to_msg(oneline_body + 1); | |
356 | add_to_msg("\"\n\nThis reverts commit "); | |
9509af68 JS |
357 | add_to_msg(sha1_to_hex(commit->object.sha1)); |
358 | add_to_msg(".\n"); | |
359 | } else { | |
7791ecbc | 360 | base = parent; |
9509af68 JS |
361 | next = commit; |
362 | set_author_ident_env(message); | |
363 | add_message_to_msg(message); | |
f8103794 | 364 | if (no_replay) { |
0e624044 | 365 | add_to_msg("(cherry picked from commit "); |
9509af68 JS |
366 | add_to_msg(sha1_to_hex(commit->object.sha1)); |
367 | add_to_msg(")\n"); | |
368 | } | |
369 | } | |
9509af68 JS |
370 | |
371 | if (merge_recursive(sha1_to_hex(base->object.sha1), | |
372 | sha1_to_hex(head), "HEAD", | |
f52463a5 | 373 | sha1_to_hex(next->object.sha1), oneline) || |
45525bd0 | 374 | write_cache_as_tree(head, 0, NULL)) { |
9509af68 JS |
375 | add_to_msg("\nConflicts:\n\n"); |
376 | read_cache(); | |
377 | for (i = 0; i < active_nr;) { | |
378 | struct cache_entry *ce = active_cache[i++]; | |
379 | if (ce_stage(ce)) { | |
380 | add_to_msg("\t"); | |
381 | add_to_msg(ce->name); | |
382 | add_to_msg("\n"); | |
383 | while (i < active_nr && !strcmp(ce->name, | |
384 | active_cache[i]->name)) | |
385 | i++; | |
386 | } | |
387 | } | |
4ed7cd3a | 388 | if (commit_lock_file(&msg_file) < 0) |
abda5227 | 389 | die ("Error wrapping up %s", defmsg); |
804c7174 WC |
390 | fprintf(stderr, "Automatic %s failed.%s\n", |
391 | me, help_msg(commit->object.sha1)); | |
9509af68 JS |
392 | exit(1); |
393 | } | |
4ed7cd3a | 394 | if (commit_lock_file(&msg_file) < 0) |
abda5227 | 395 | die ("Error wrapping up %s", defmsg); |
9509af68 JS |
396 | fprintf(stderr, "Finished one %s.\n", me); |
397 | ||
398 | /* | |
399 | * | |
400 | * If we are cherry-pick, and if the merge did not result in | |
401 | * hand-editing, we will hit this commit and inherit the original | |
402 | * author date and name. | |
403 | * If we are revert, or if our cherry-pick results in a hand merge, | |
404 | * we had better say that the current user is responsible for that. | |
405 | */ | |
406 | ||
407 | if (!no_commit) { | |
cfd9c277 DM |
408 | /* 6 is max possible length of our args array including NULL */ |
409 | const char *args[6]; | |
410 | int i = 0; | |
411 | args[i++] = "commit"; | |
412 | args[i++] = "-n"; | |
413 | if (signoff) | |
414 | args[i++] = "-s"; | |
415 | if (!edit) { | |
416 | args[i++] = "-F"; | |
417 | args[i++] = defmsg; | |
418 | } | |
419 | args[i] = NULL; | |
420 | return execv_git_cmd(args); | |
9509af68 | 421 | } |
8e0f7003 | 422 | free(reencoded_message); |
9509af68 JS |
423 | |
424 | return 0; | |
425 | } | |
426 | ||
427 | int cmd_revert(int argc, const char **argv, const char *prefix) | |
428 | { | |
429 | if (isatty(0)) | |
430 | edit = 1; | |
f8103794 | 431 | no_replay = 1; |
9509af68 JS |
432 | action = REVERT; |
433 | return revert_or_cherry_pick(argc, argv); | |
434 | } | |
435 | ||
436 | int cmd_cherry_pick(int argc, const char **argv, const char *prefix) | |
437 | { | |
f8103794 | 438 | no_replay = 0; |
9509af68 JS |
439 | action = CHERRY_PICK; |
440 | return revert_or_cherry_pick(argc, argv); | |
441 | } |