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f2dc849e JS |
1 | /* |
2 | * "git fast-export" builtin command | |
3 | * | |
4 | * Copyright (C) 2007 Johannes E. Schindelin | |
5 | */ | |
6 | #include "builtin.h" | |
7 | #include "cache.h" | |
8 | #include "commit.h" | |
9 | #include "object.h" | |
10 | #include "tag.h" | |
11 | #include "diff.h" | |
12 | #include "diffcore.h" | |
13 | #include "log-tree.h" | |
14 | #include "revision.h" | |
15 | #include "decorate.h" | |
16 | #include "path-list.h" | |
17 | #include "utf8.h" | |
18 | #include "parse-options.h" | |
19 | ||
20 | static const char *fast_export_usage[] = { | |
21 | "git-fast-export [rev-list-opts]", | |
22 | NULL | |
23 | }; | |
24 | ||
25 | static int progress; | |
ee4bc371 | 26 | static enum { VERBATIM, WARN, STRIP, ABORT } signed_tag_mode = ABORT; |
f2dc849e JS |
27 | |
28 | static int parse_opt_signed_tag_mode(const struct option *opt, | |
29 | const char *arg, int unset) | |
30 | { | |
31 | if (unset || !strcmp(arg, "abort")) | |
32 | signed_tag_mode = ABORT; | |
ee4bc371 JS |
33 | else if (!strcmp(arg, "verbatim") || !strcmp(arg, "ignore")) |
34 | signed_tag_mode = VERBATIM; | |
f2dc849e JS |
35 | else if (!strcmp(arg, "warn")) |
36 | signed_tag_mode = WARN; | |
37 | else if (!strcmp(arg, "strip")) | |
38 | signed_tag_mode = STRIP; | |
39 | else | |
40 | return error("Unknown signed-tag mode: %s", arg); | |
41 | return 0; | |
42 | } | |
43 | ||
44 | static struct decoration idnums; | |
45 | static uint32_t last_idnum; | |
46 | ||
47 | static int has_unshown_parent(struct commit *commit) | |
48 | { | |
49 | struct commit_list *parent; | |
50 | ||
51 | for (parent = commit->parents; parent; parent = parent->next) | |
52 | if (!(parent->item->object.flags & SHOWN) && | |
53 | !(parent->item->object.flags & UNINTERESTING)) | |
54 | return 1; | |
55 | return 0; | |
56 | } | |
57 | ||
58 | /* Since intptr_t is C99, we do not use it here */ | |
59 | static void mark_object(struct object *object) | |
60 | { | |
61 | last_idnum++; | |
62 | add_decoration(&idnums, object, ((uint32_t *)NULL) + last_idnum); | |
63 | } | |
64 | ||
65 | static int get_object_mark(struct object *object) | |
66 | { | |
67 | void *decoration = lookup_decoration(&idnums, object); | |
68 | if (!decoration) | |
69 | return 0; | |
70 | return (uint32_t *)decoration - (uint32_t *)NULL; | |
71 | } | |
72 | ||
73 | static void show_progress(void) | |
74 | { | |
75 | static int counter = 0; | |
76 | if (!progress) | |
77 | return; | |
78 | if ((++counter % progress) == 0) | |
79 | printf("progress %d objects\n", counter); | |
80 | } | |
81 | ||
82 | static void handle_object(const unsigned char *sha1) | |
83 | { | |
84 | unsigned long size; | |
85 | enum object_type type; | |
86 | char *buf; | |
87 | struct object *object; | |
88 | ||
89 | if (is_null_sha1(sha1)) | |
90 | return; | |
91 | ||
92 | object = parse_object(sha1); | |
93 | if (!object) | |
94 | die ("Could not read blob %s", sha1_to_hex(sha1)); | |
95 | ||
96 | if (object->flags & SHOWN) | |
97 | return; | |
98 | ||
99 | buf = read_sha1_file(sha1, &type, &size); | |
100 | if (!buf) | |
101 | die ("Could not read blob %s", sha1_to_hex(sha1)); | |
102 | ||
103 | mark_object(object); | |
104 | ||
105 | printf("blob\nmark :%d\ndata %lu\n", last_idnum, size); | |
b0fe0d72 | 106 | if (size && fwrite(buf, size, 1, stdout) != 1) |
f2dc849e JS |
107 | die ("Could not write blob %s", sha1_to_hex(sha1)); |
108 | printf("\n"); | |
109 | ||
110 | show_progress(); | |
111 | ||
112 | object->flags |= SHOWN; | |
113 | free(buf); | |
114 | } | |
115 | ||
116 | static void show_filemodify(struct diff_queue_struct *q, | |
117 | struct diff_options *options, void *data) | |
118 | { | |
119 | int i; | |
120 | for (i = 0; i < q->nr; i++) { | |
121 | struct diff_filespec *spec = q->queue[i]->two; | |
122 | if (is_null_sha1(spec->sha1)) | |
123 | printf("D %s\n", spec->path); | |
124 | else { | |
125 | struct object *object = lookup_object(spec->sha1); | |
ce4a7bff | 126 | printf("M %06o :%d %s\n", spec->mode, |
f2dc849e JS |
127 | get_object_mark(object), spec->path); |
128 | } | |
129 | } | |
130 | } | |
131 | ||
132 | static const char *find_encoding(const char *begin, const char *end) | |
133 | { | |
134 | const char *needle = "\nencoding "; | |
135 | char *bol, *eol; | |
136 | ||
137 | bol = memmem(begin, end ? end - begin : strlen(begin), | |
138 | needle, strlen(needle)); | |
139 | if (!bol) | |
140 | return git_commit_encoding; | |
141 | bol += strlen(needle); | |
142 | eol = strchrnul(bol, '\n'); | |
143 | *eol = '\0'; | |
144 | return bol; | |
145 | } | |
146 | ||
147 | static void handle_commit(struct commit *commit, struct rev_info *rev) | |
148 | { | |
149 | int saved_output_format = rev->diffopt.output_format; | |
150 | const char *author, *author_end, *committer, *committer_end; | |
151 | const char *encoding, *message; | |
152 | char *reencoded = NULL; | |
153 | struct commit_list *p; | |
154 | int i; | |
155 | ||
156 | rev->diffopt.output_format = DIFF_FORMAT_CALLBACK; | |
157 | ||
158 | parse_commit(commit); | |
159 | author = strstr(commit->buffer, "\nauthor "); | |
160 | if (!author) | |
161 | die ("Could not find author in commit %s", | |
162 | sha1_to_hex(commit->object.sha1)); | |
163 | author++; | |
164 | author_end = strchrnul(author, '\n'); | |
165 | committer = strstr(author_end, "\ncommitter "); | |
166 | if (!committer) | |
167 | die ("Could not find committer in commit %s", | |
168 | sha1_to_hex(commit->object.sha1)); | |
169 | committer++; | |
170 | committer_end = strchrnul(committer, '\n'); | |
171 | message = strstr(committer_end, "\n\n"); | |
172 | encoding = find_encoding(committer_end, message); | |
173 | if (message) | |
174 | message += 2; | |
175 | ||
176 | if (commit->parents) { | |
177 | parse_commit(commit->parents->item); | |
178 | diff_tree_sha1(commit->parents->item->tree->object.sha1, | |
179 | commit->tree->object.sha1, "", &rev->diffopt); | |
180 | } | |
181 | else | |
182 | diff_root_tree_sha1(commit->tree->object.sha1, | |
183 | "", &rev->diffopt); | |
184 | ||
185 | for (i = 0; i < diff_queued_diff.nr; i++) | |
186 | handle_object(diff_queued_diff.queue[i]->two->sha1); | |
187 | ||
188 | mark_object(&commit->object); | |
189 | if (!is_encoding_utf8(encoding)) | |
190 | reencoded = reencode_string(message, "UTF-8", encoding); | |
191 | printf("commit %s\nmark :%d\n%.*s\n%.*s\ndata %u\n%s", | |
192 | (const char *)commit->util, last_idnum, | |
193 | (int)(author_end - author), author, | |
194 | (int)(committer_end - committer), committer, | |
195 | (unsigned)(reencoded | |
196 | ? strlen(reencoded) : message | |
197 | ? strlen(message) : 0), | |
198 | reencoded ? reencoded : message ? message : ""); | |
8e0f7003 | 199 | free(reencoded); |
f2dc849e JS |
200 | |
201 | for (i = 0, p = commit->parents; p; p = p->next) { | |
202 | int mark = get_object_mark(&p->item->object); | |
203 | if (!mark) | |
204 | continue; | |
205 | if (i == 0) | |
206 | printf("from :%d\n", mark); | |
207 | else if (i == 1) | |
208 | printf("merge :%d", mark); | |
209 | else | |
210 | printf(" :%d", mark); | |
211 | i++; | |
212 | } | |
213 | if (i > 1) | |
214 | printf("\n"); | |
215 | ||
216 | log_tree_diff_flush(rev); | |
217 | rev->diffopt.output_format = saved_output_format; | |
218 | ||
219 | printf("\n"); | |
220 | ||
221 | show_progress(); | |
222 | } | |
223 | ||
224 | static void handle_tail(struct object_array *commits, struct rev_info *revs) | |
225 | { | |
226 | struct commit *commit; | |
227 | while (commits->nr) { | |
228 | commit = (struct commit *)commits->objects[commits->nr - 1].item; | |
229 | if (has_unshown_parent(commit)) | |
230 | return; | |
231 | handle_commit(commit, revs); | |
232 | commits->nr--; | |
233 | } | |
234 | } | |
235 | ||
236 | static void handle_tag(const char *name, struct tag *tag) | |
237 | { | |
238 | unsigned long size; | |
239 | enum object_type type; | |
240 | char *buf; | |
241 | const char *tagger, *tagger_end, *message; | |
242 | size_t message_size = 0; | |
243 | ||
244 | buf = read_sha1_file(tag->object.sha1, &type, &size); | |
245 | if (!buf) | |
246 | die ("Could not read tag %s", sha1_to_hex(tag->object.sha1)); | |
247 | message = memmem(buf, size, "\n\n", 2); | |
248 | if (message) { | |
249 | message += 2; | |
250 | message_size = strlen(message); | |
251 | } | |
252 | tagger = memmem(buf, message ? message - buf : size, "\ntagger ", 8); | |
253 | if (!tagger) | |
254 | die ("No tagger for tag %s", sha1_to_hex(tag->object.sha1)); | |
255 | tagger++; | |
256 | tagger_end = strchrnul(tagger, '\n'); | |
257 | ||
258 | /* handle signed tags */ | |
259 | if (message) { | |
260 | const char *signature = strstr(message, | |
261 | "\n-----BEGIN PGP SIGNATURE-----\n"); | |
262 | if (signature) | |
263 | switch(signed_tag_mode) { | |
264 | case ABORT: | |
265 | die ("Encountered signed tag %s; use " | |
266 | "--signed-tag=<mode> to handle it.", | |
267 | sha1_to_hex(tag->object.sha1)); | |
268 | case WARN: | |
269 | warning ("Exporting signed tag %s", | |
270 | sha1_to_hex(tag->object.sha1)); | |
271 | /* fallthru */ | |
ee4bc371 | 272 | case VERBATIM: |
f2dc849e JS |
273 | break; |
274 | case STRIP: | |
275 | message_size = signature + 1 - message; | |
276 | break; | |
277 | } | |
278 | } | |
279 | ||
280 | if (!prefixcmp(name, "refs/tags/")) | |
281 | name += 10; | |
282 | printf("tag %s\nfrom :%d\n%.*s\ndata %d\n%.*s\n", | |
283 | name, get_object_mark(tag->tagged), | |
284 | (int)(tagger_end - tagger), tagger, | |
285 | (int)message_size, (int)message_size, message ? message : ""); | |
286 | } | |
287 | ||
288 | static void get_tags_and_duplicates(struct object_array *pending, | |
289 | struct path_list *extra_refs) | |
290 | { | |
291 | struct tag *tag; | |
292 | int i; | |
293 | ||
294 | for (i = 0; i < pending->nr; i++) { | |
295 | struct object_array_entry *e = pending->objects + i; | |
296 | unsigned char sha1[20]; | |
297 | struct commit *commit = commit; | |
298 | char *full_name; | |
299 | ||
300 | if (dwim_ref(e->name, strlen(e->name), sha1, &full_name) != 1) | |
301 | continue; | |
302 | ||
303 | switch (e->item->type) { | |
304 | case OBJ_COMMIT: | |
305 | commit = (struct commit *)e->item; | |
306 | break; | |
307 | case OBJ_TAG: | |
308 | tag = (struct tag *)e->item; | |
309 | while (tag && tag->object.type == OBJ_TAG) { | |
310 | path_list_insert(full_name, extra_refs)->util = tag; | |
311 | tag = (struct tag *)tag->tagged; | |
312 | } | |
313 | if (!tag) | |
314 | die ("Tag %s points nowhere?", e->name); | |
315 | switch(tag->object.type) { | |
316 | case OBJ_COMMIT: | |
317 | commit = (struct commit *)tag; | |
318 | break; | |
319 | case OBJ_BLOB: | |
320 | handle_object(tag->object.sha1); | |
321 | continue; | |
322 | } | |
323 | break; | |
324 | default: | |
325 | die ("Unexpected object of type %s", | |
326 | typename(e->item->type)); | |
327 | } | |
328 | if (commit->util) | |
329 | /* more than one name for the same object */ | |
330 | path_list_insert(full_name, extra_refs)->util = commit; | |
331 | else | |
332 | commit->util = full_name; | |
333 | } | |
334 | } | |
335 | ||
336 | static void handle_tags_and_duplicates(struct path_list *extra_refs) | |
337 | { | |
338 | struct commit *commit; | |
339 | int i; | |
340 | ||
341 | for (i = extra_refs->nr - 1; i >= 0; i--) { | |
342 | const char *name = extra_refs->items[i].path; | |
343 | struct object *object = extra_refs->items[i].util; | |
344 | switch (object->type) { | |
345 | case OBJ_TAG: | |
346 | handle_tag(name, (struct tag *)object); | |
347 | break; | |
348 | case OBJ_COMMIT: | |
349 | /* create refs pointing to already seen commits */ | |
350 | commit = (struct commit *)object; | |
351 | printf("reset %s\nfrom :%d\n\n", name, | |
352 | get_object_mark(&commit->object)); | |
353 | show_progress(); | |
354 | break; | |
355 | } | |
356 | } | |
357 | } | |
358 | ||
359 | int cmd_fast_export(int argc, const char **argv, const char *prefix) | |
360 | { | |
361 | struct rev_info revs; | |
362 | struct object_array commits = { 0, 0, NULL }; | |
363 | struct path_list extra_refs = { NULL, 0, 0, 0 }; | |
364 | struct commit *commit; | |
365 | struct option options[] = { | |
366 | OPT_INTEGER(0, "progress", &progress, | |
367 | "show progress after <n> objects"), | |
368 | OPT_CALLBACK(0, "signed-tags", &signed_tag_mode, "mode", | |
369 | "select handling of signed tags", | |
370 | parse_opt_signed_tag_mode), | |
371 | OPT_END() | |
372 | }; | |
373 | ||
374 | /* we handle encodings */ | |
ef90d6d4 | 375 | git_config(git_default_config, NULL); |
f2dc849e JS |
376 | |
377 | init_revisions(&revs, prefix); | |
378 | argc = setup_revisions(argc, argv, &revs, NULL); | |
379 | argc = parse_options(argc, argv, options, fast_export_usage, 0); | |
380 | if (argc > 1) | |
381 | usage_with_options (fast_export_usage, options); | |
382 | ||
383 | get_tags_and_duplicates(&revs.pending, &extra_refs); | |
384 | ||
3d51e1b5 MK |
385 | if (prepare_revision_walk(&revs)) |
386 | die("revision walk setup failed"); | |
f2dc849e JS |
387 | revs.diffopt.format_callback = show_filemodify; |
388 | DIFF_OPT_SET(&revs.diffopt, RECURSIVE); | |
389 | while ((commit = get_revision(&revs))) { | |
390 | if (has_unshown_parent(commit)) { | |
391 | struct commit_list *parent = commit->parents; | |
392 | add_object_array(&commit->object, NULL, &commits); | |
393 | for (; parent; parent = parent->next) | |
394 | if (!parent->item->util) | |
395 | parent->item->util = commit->util; | |
396 | } | |
397 | else { | |
398 | handle_commit(commit, &revs); | |
399 | handle_tail(&commits, &revs); | |
400 | } | |
401 | } | |
402 | ||
403 | handle_tags_and_duplicates(&extra_refs); | |
404 | ||
405 | return 0; | |
406 | } |