Merge branch 'js/export-with-assignment'
[git/git.git] / builtin-fast-export.c
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;
26 static enum { IGNORE, WARN, STRIP, ABORT } signed_tag_mode = ABORT;
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;
33 else if (!strcmp(arg, "ignore"))
34 signed_tag_mode = IGNORE;
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);
106 if (fwrite(buf, size, 1, stdout) != 1)
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);
126 printf("M 0%06o :%d %s\n", spec->mode,
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 : "");
199 if (reencoded)
200 free(reencoded);
201
202 for (i = 0, p = commit->parents; p; p = p->next) {
203 int mark = get_object_mark(&p->item->object);
204 if (!mark)
205 continue;
206 if (i == 0)
207 printf("from :%d\n", mark);
208 else if (i == 1)
209 printf("merge :%d", mark);
210 else
211 printf(" :%d", mark);
212 i++;
213 }
214 if (i > 1)
215 printf("\n");
216
217 log_tree_diff_flush(rev);
218 rev->diffopt.output_format = saved_output_format;
219
220 printf("\n");
221
222 show_progress();
223 }
224
225 static void handle_tail(struct object_array *commits, struct rev_info *revs)
226 {
227 struct commit *commit;
228 while (commits->nr) {
229 commit = (struct commit *)commits->objects[commits->nr - 1].item;
230 if (has_unshown_parent(commit))
231 return;
232 handle_commit(commit, revs);
233 commits->nr--;
234 }
235 }
236
237 static void handle_tag(const char *name, struct tag *tag)
238 {
239 unsigned long size;
240 enum object_type type;
241 char *buf;
242 const char *tagger, *tagger_end, *message;
243 size_t message_size = 0;
244
245 buf = read_sha1_file(tag->object.sha1, &type, &size);
246 if (!buf)
247 die ("Could not read tag %s", sha1_to_hex(tag->object.sha1));
248 message = memmem(buf, size, "\n\n", 2);
249 if (message) {
250 message += 2;
251 message_size = strlen(message);
252 }
253 tagger = memmem(buf, message ? message - buf : size, "\ntagger ", 8);
254 if (!tagger)
255 die ("No tagger for tag %s", sha1_to_hex(tag->object.sha1));
256 tagger++;
257 tagger_end = strchrnul(tagger, '\n');
258
259 /* handle signed tags */
260 if (message) {
261 const char *signature = strstr(message,
262 "\n-----BEGIN PGP SIGNATURE-----\n");
263 if (signature)
264 switch(signed_tag_mode) {
265 case ABORT:
266 die ("Encountered signed tag %s; use "
267 "--signed-tag=<mode> to handle it.",
268 sha1_to_hex(tag->object.sha1));
269 case WARN:
270 warning ("Exporting signed tag %s",
271 sha1_to_hex(tag->object.sha1));
272 /* fallthru */
273 case IGNORE:
274 break;
275 case STRIP:
276 message_size = signature + 1 - message;
277 break;
278 }
279 }
280
281 if (!prefixcmp(name, "refs/tags/"))
282 name += 10;
283 printf("tag %s\nfrom :%d\n%.*s\ndata %d\n%.*s\n",
284 name, get_object_mark(tag->tagged),
285 (int)(tagger_end - tagger), tagger,
286 (int)message_size, (int)message_size, message ? message : "");
287 }
288
289 static void get_tags_and_duplicates(struct object_array *pending,
290 struct path_list *extra_refs)
291 {
292 struct tag *tag;
293 int i;
294
295 for (i = 0; i < pending->nr; i++) {
296 struct object_array_entry *e = pending->objects + i;
297 unsigned char sha1[20];
298 struct commit *commit = commit;
299 char *full_name;
300
301 if (dwim_ref(e->name, strlen(e->name), sha1, &full_name) != 1)
302 continue;
303
304 switch (e->item->type) {
305 case OBJ_COMMIT:
306 commit = (struct commit *)e->item;
307 break;
308 case OBJ_TAG:
309 tag = (struct tag *)e->item;
310 while (tag && tag->object.type == OBJ_TAG) {
311 path_list_insert(full_name, extra_refs)->util = tag;
312 tag = (struct tag *)tag->tagged;
313 }
314 if (!tag)
315 die ("Tag %s points nowhere?", e->name);
316 switch(tag->object.type) {
317 case OBJ_COMMIT:
318 commit = (struct commit *)tag;
319 break;
320 case OBJ_BLOB:
321 handle_object(tag->object.sha1);
322 continue;
323 }
324 break;
325 default:
326 die ("Unexpected object of type %s",
327 typename(e->item->type));
328 }
329 if (commit->util)
330 /* more than one name for the same object */
331 path_list_insert(full_name, extra_refs)->util = commit;
332 else
333 commit->util = full_name;
334 }
335 }
336
337 static void handle_tags_and_duplicates(struct path_list *extra_refs)
338 {
339 struct commit *commit;
340 int i;
341
342 for (i = extra_refs->nr - 1; i >= 0; i--) {
343 const char *name = extra_refs->items[i].path;
344 struct object *object = extra_refs->items[i].util;
345 switch (object->type) {
346 case OBJ_TAG:
347 handle_tag(name, (struct tag *)object);
348 break;
349 case OBJ_COMMIT:
350 /* create refs pointing to already seen commits */
351 commit = (struct commit *)object;
352 printf("reset %s\nfrom :%d\n\n", name,
353 get_object_mark(&commit->object));
354 show_progress();
355 break;
356 }
357 }
358 }
359
360 int cmd_fast_export(int argc, const char **argv, const char *prefix)
361 {
362 struct rev_info revs;
363 struct object_array commits = { 0, 0, NULL };
364 struct path_list extra_refs = { NULL, 0, 0, 0 };
365 struct commit *commit;
366 struct option options[] = {
367 OPT_INTEGER(0, "progress", &progress,
368 "show progress after <n> objects"),
369 OPT_CALLBACK(0, "signed-tags", &signed_tag_mode, "mode",
370 "select handling of signed tags",
371 parse_opt_signed_tag_mode),
372 OPT_END()
373 };
374
375 /* we handle encodings */
376 git_config(git_default_config);
377
378 init_revisions(&revs, prefix);
379 argc = setup_revisions(argc, argv, &revs, NULL);
380 argc = parse_options(argc, argv, options, fast_export_usage, 0);
381 if (argc > 1)
382 usage_with_options (fast_export_usage, options);
383
384 get_tags_and_duplicates(&revs.pending, &extra_refs);
385
386 prepare_revision_walk(&revs);
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 }