Sync with 1.7.12.3
[git/jnareb-git.git] / builtin / fast-export.c
blob12220ad8dac65acaa556c6524310d5540709f324
1 /*
2 * "git fast-export" builtin command
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 "string-list.h"
17 #include "utf8.h"
18 #include "parse-options.h"
19 #include "quote.h"
21 static const char *fast_export_usage[] = {
22 N_("git fast-export [rev-list-opts]"),
23 NULL
26 static int progress;
27 static enum { ABORT, VERBATIM, WARN, STRIP } signed_tag_mode = ABORT;
28 static enum { ERROR, DROP, REWRITE } tag_of_filtered_mode = ERROR;
29 static int fake_missing_tagger;
30 static int use_done_feature;
31 static int no_data;
32 static int full_tree;
34 static int parse_opt_signed_tag_mode(const struct option *opt,
35 const char *arg, int unset)
37 if (unset || !strcmp(arg, "abort"))
38 signed_tag_mode = ABORT;
39 else if (!strcmp(arg, "verbatim") || !strcmp(arg, "ignore"))
40 signed_tag_mode = VERBATIM;
41 else if (!strcmp(arg, "warn"))
42 signed_tag_mode = WARN;
43 else if (!strcmp(arg, "strip"))
44 signed_tag_mode = STRIP;
45 else
46 return error("Unknown signed-tag mode: %s", arg);
47 return 0;
50 static int parse_opt_tag_of_filtered_mode(const struct option *opt,
51 const char *arg, int unset)
53 if (unset || !strcmp(arg, "abort"))
54 tag_of_filtered_mode = ERROR;
55 else if (!strcmp(arg, "drop"))
56 tag_of_filtered_mode = DROP;
57 else if (!strcmp(arg, "rewrite"))
58 tag_of_filtered_mode = REWRITE;
59 else
60 return error("Unknown tag-of-filtered mode: %s", arg);
61 return 0;
64 static struct decoration idnums;
65 static uint32_t last_idnum;
67 static int has_unshown_parent(struct commit *commit)
69 struct commit_list *parent;
71 for (parent = commit->parents; parent; parent = parent->next)
72 if (!(parent->item->object.flags & SHOWN) &&
73 !(parent->item->object.flags & UNINTERESTING))
74 return 1;
75 return 0;
78 /* Since intptr_t is C99, we do not use it here */
79 static inline uint32_t *mark_to_ptr(uint32_t mark)
81 return ((uint32_t *)NULL) + mark;
84 static inline uint32_t ptr_to_mark(void * mark)
86 return (uint32_t *)mark - (uint32_t *)NULL;
89 static inline void mark_object(struct object *object, uint32_t mark)
91 add_decoration(&idnums, object, mark_to_ptr(mark));
94 static inline void mark_next_object(struct object *object)
96 mark_object(object, ++last_idnum);
99 static int get_object_mark(struct object *object)
101 void *decoration = lookup_decoration(&idnums, object);
102 if (!decoration)
103 return 0;
104 return ptr_to_mark(decoration);
107 static void show_progress(void)
109 static int counter = 0;
110 if (!progress)
111 return;
112 if ((++counter % progress) == 0)
113 printf("progress %d objects\n", counter);
116 static void handle_object(const unsigned char *sha1)
118 unsigned long size;
119 enum object_type type;
120 char *buf;
121 struct object *object;
123 if (no_data)
124 return;
126 if (is_null_sha1(sha1))
127 return;
129 object = parse_object(sha1);
130 if (!object)
131 die ("Could not read blob %s", sha1_to_hex(sha1));
133 if (object->flags & SHOWN)
134 return;
136 buf = read_sha1_file(sha1, &type, &size);
137 if (!buf)
138 die ("Could not read blob %s", sha1_to_hex(sha1));
140 mark_next_object(object);
142 printf("blob\nmark :%"PRIu32"\ndata %lu\n", last_idnum, size);
143 if (size && fwrite(buf, size, 1, stdout) != 1)
144 die_errno ("Could not write blob '%s'", sha1_to_hex(sha1));
145 printf("\n");
147 show_progress();
149 object->flags |= SHOWN;
150 free(buf);
153 static int depth_first(const void *a_, const void *b_)
155 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
156 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
157 const char *name_a, *name_b;
158 int len_a, len_b, len;
159 int cmp;
161 name_a = a->one ? a->one->path : a->two->path;
162 name_b = b->one ? b->one->path : b->two->path;
164 len_a = strlen(name_a);
165 len_b = strlen(name_b);
166 len = (len_a < len_b) ? len_a : len_b;
168 /* strcmp will sort 'd' before 'd/e', we want 'd/e' before 'd' */
169 cmp = memcmp(name_a, name_b, len);
170 if (cmp)
171 return cmp;
172 cmp = len_b - len_a;
173 if (cmp)
174 return cmp;
176 * Move 'R'ename entries last so that all references of the file
177 * appear in the output before it is renamed (e.g., when a file
178 * was copied and renamed in the same commit).
180 return (a->status == 'R') - (b->status == 'R');
183 static void print_path(const char *path)
185 int need_quote = quote_c_style(path, NULL, NULL, 0);
186 if (need_quote)
187 quote_c_style(path, NULL, stdout, 0);
188 else if (strchr(path, ' '))
189 printf("\"%s\"", path);
190 else
191 printf("%s", path);
194 static void show_filemodify(struct diff_queue_struct *q,
195 struct diff_options *options, void *data)
197 int i;
200 * Handle files below a directory first, in case they are all deleted
201 * and the directory changes to a file or symlink.
203 qsort(q->queue, q->nr, sizeof(q->queue[0]), depth_first);
205 for (i = 0; i < q->nr; i++) {
206 struct diff_filespec *ospec = q->queue[i]->one;
207 struct diff_filespec *spec = q->queue[i]->two;
209 switch (q->queue[i]->status) {
210 case DIFF_STATUS_DELETED:
211 printf("D ");
212 print_path(spec->path);
213 putchar('\n');
214 break;
216 case DIFF_STATUS_COPIED:
217 case DIFF_STATUS_RENAMED:
218 printf("%c ", q->queue[i]->status);
219 print_path(ospec->path);
220 putchar(' ');
221 print_path(spec->path);
222 putchar('\n');
224 if (!hashcmp(ospec->sha1, spec->sha1) &&
225 ospec->mode == spec->mode)
226 break;
227 /* fallthrough */
229 case DIFF_STATUS_TYPE_CHANGED:
230 case DIFF_STATUS_MODIFIED:
231 case DIFF_STATUS_ADDED:
233 * Links refer to objects in another repositories;
234 * output the SHA-1 verbatim.
236 if (no_data || S_ISGITLINK(spec->mode))
237 printf("M %06o %s ", spec->mode,
238 sha1_to_hex(spec->sha1));
239 else {
240 struct object *object = lookup_object(spec->sha1);
241 printf("M %06o :%d ", spec->mode,
242 get_object_mark(object));
244 print_path(spec->path);
245 putchar('\n');
246 break;
248 default:
249 die("Unexpected comparison status '%c' for %s, %s",
250 q->queue[i]->status,
251 ospec->path ? ospec->path : "none",
252 spec->path ? spec->path : "none");
257 static const char *find_encoding(const char *begin, const char *end)
259 const char *needle = "\nencoding ";
260 char *bol, *eol;
262 bol = memmem(begin, end ? end - begin : strlen(begin),
263 needle, strlen(needle));
264 if (!bol)
265 return git_commit_encoding;
266 bol += strlen(needle);
267 eol = strchrnul(bol, '\n');
268 *eol = '\0';
269 return bol;
272 static void handle_commit(struct commit *commit, struct rev_info *rev)
274 int saved_output_format = rev->diffopt.output_format;
275 const char *author, *author_end, *committer, *committer_end;
276 const char *encoding, *message;
277 char *reencoded = NULL;
278 struct commit_list *p;
279 int i;
281 rev->diffopt.output_format = DIFF_FORMAT_CALLBACK;
283 parse_commit(commit);
284 author = strstr(commit->buffer, "\nauthor ");
285 if (!author)
286 die ("Could not find author in commit %s",
287 sha1_to_hex(commit->object.sha1));
288 author++;
289 author_end = strchrnul(author, '\n');
290 committer = strstr(author_end, "\ncommitter ");
291 if (!committer)
292 die ("Could not find committer in commit %s",
293 sha1_to_hex(commit->object.sha1));
294 committer++;
295 committer_end = strchrnul(committer, '\n');
296 message = strstr(committer_end, "\n\n");
297 encoding = find_encoding(committer_end, message);
298 if (message)
299 message += 2;
301 if (commit->parents &&
302 get_object_mark(&commit->parents->item->object) != 0 &&
303 !full_tree) {
304 parse_commit(commit->parents->item);
305 diff_tree_sha1(commit->parents->item->tree->object.sha1,
306 commit->tree->object.sha1, "", &rev->diffopt);
308 else
309 diff_root_tree_sha1(commit->tree->object.sha1,
310 "", &rev->diffopt);
312 /* Export the referenced blobs, and remember the marks. */
313 for (i = 0; i < diff_queued_diff.nr; i++)
314 if (!S_ISGITLINK(diff_queued_diff.queue[i]->two->mode))
315 handle_object(diff_queued_diff.queue[i]->two->sha1);
317 mark_next_object(&commit->object);
318 if (!is_encoding_utf8(encoding))
319 reencoded = reencode_string(message, "UTF-8", encoding);
320 if (!commit->parents)
321 printf("reset %s\n", (const char*)commit->util);
322 printf("commit %s\nmark :%"PRIu32"\n%.*s\n%.*s\ndata %u\n%s",
323 (const char *)commit->util, last_idnum,
324 (int)(author_end - author), author,
325 (int)(committer_end - committer), committer,
326 (unsigned)(reencoded
327 ? strlen(reencoded) : message
328 ? strlen(message) : 0),
329 reencoded ? reencoded : message ? message : "");
330 free(reencoded);
332 for (i = 0, p = commit->parents; p; p = p->next) {
333 int mark = get_object_mark(&p->item->object);
334 if (!mark)
335 continue;
336 if (i == 0)
337 printf("from :%d\n", mark);
338 else
339 printf("merge :%d\n", mark);
340 i++;
343 if (full_tree)
344 printf("deleteall\n");
345 log_tree_diff_flush(rev);
346 rev->diffopt.output_format = saved_output_format;
348 printf("\n");
350 show_progress();
353 static void handle_tail(struct object_array *commits, struct rev_info *revs)
355 struct commit *commit;
356 while (commits->nr) {
357 commit = (struct commit *)commits->objects[commits->nr - 1].item;
358 if (has_unshown_parent(commit))
359 return;
360 handle_commit(commit, revs);
361 commits->nr--;
365 static void handle_tag(const char *name, struct tag *tag)
367 unsigned long size;
368 enum object_type type;
369 char *buf;
370 const char *tagger, *tagger_end, *message;
371 size_t message_size = 0;
372 struct object *tagged;
373 int tagged_mark;
374 struct commit *p;
376 /* Trees have no identifer in fast-export output, thus we have no way
377 * to output tags of trees, tags of tags of trees, etc. Simply omit
378 * such tags.
380 tagged = tag->tagged;
381 while (tagged->type == OBJ_TAG) {
382 tagged = ((struct tag *)tagged)->tagged;
384 if (tagged->type == OBJ_TREE) {
385 warning("Omitting tag %s,\nsince tags of trees (or tags of tags of trees, etc.) are not supported.",
386 sha1_to_hex(tag->object.sha1));
387 return;
390 buf = read_sha1_file(tag->object.sha1, &type, &size);
391 if (!buf)
392 die ("Could not read tag %s", sha1_to_hex(tag->object.sha1));
393 message = memmem(buf, size, "\n\n", 2);
394 if (message) {
395 message += 2;
396 message_size = strlen(message);
398 tagger = memmem(buf, message ? message - buf : size, "\ntagger ", 8);
399 if (!tagger) {
400 if (fake_missing_tagger)
401 tagger = "tagger Unspecified Tagger "
402 "<unspecified-tagger> 0 +0000";
403 else
404 tagger = "";
405 tagger_end = tagger + strlen(tagger);
406 } else {
407 tagger++;
408 tagger_end = strchrnul(tagger, '\n');
411 /* handle signed tags */
412 if (message) {
413 const char *signature = strstr(message,
414 "\n-----BEGIN PGP SIGNATURE-----\n");
415 if (signature)
416 switch(signed_tag_mode) {
417 case ABORT:
418 die ("Encountered signed tag %s; use "
419 "--signed-tag=<mode> to handle it.",
420 sha1_to_hex(tag->object.sha1));
421 case WARN:
422 warning ("Exporting signed tag %s",
423 sha1_to_hex(tag->object.sha1));
424 /* fallthru */
425 case VERBATIM:
426 break;
427 case STRIP:
428 message_size = signature + 1 - message;
429 break;
433 /* handle tag->tagged having been filtered out due to paths specified */
434 tagged = tag->tagged;
435 tagged_mark = get_object_mark(tagged);
436 if (!tagged_mark) {
437 switch(tag_of_filtered_mode) {
438 case ABORT:
439 die ("Tag %s tags unexported object; use "
440 "--tag-of-filtered-object=<mode> to handle it.",
441 sha1_to_hex(tag->object.sha1));
442 case DROP:
443 /* Ignore this tag altogether */
444 return;
445 case REWRITE:
446 if (tagged->type != OBJ_COMMIT) {
447 die ("Tag %s tags unexported %s!",
448 sha1_to_hex(tag->object.sha1),
449 typename(tagged->type));
451 p = (struct commit *)tagged;
452 for (;;) {
453 if (p->parents && p->parents->next)
454 break;
455 if (p->object.flags & UNINTERESTING)
456 break;
457 if (!(p->object.flags & TREESAME))
458 break;
459 if (!p->parents)
460 die ("Can't find replacement commit for tag %s\n",
461 sha1_to_hex(tag->object.sha1));
462 p = p->parents->item;
464 tagged_mark = get_object_mark(&p->object);
468 if (!prefixcmp(name, "refs/tags/"))
469 name += 10;
470 printf("tag %s\nfrom :%d\n%.*s%sdata %d\n%.*s\n",
471 name, tagged_mark,
472 (int)(tagger_end - tagger), tagger,
473 tagger == tagger_end ? "" : "\n",
474 (int)message_size, (int)message_size, message ? message : "");
477 static void get_tags_and_duplicates(struct object_array *pending,
478 struct string_list *extra_refs)
480 struct tag *tag;
481 int i;
483 for (i = 0; i < pending->nr; i++) {
484 struct object_array_entry *e = pending->objects + i;
485 unsigned char sha1[20];
486 struct commit *commit = commit;
487 char *full_name;
489 if (dwim_ref(e->name, strlen(e->name), sha1, &full_name) != 1)
490 continue;
492 switch (e->item->type) {
493 case OBJ_COMMIT:
494 commit = (struct commit *)e->item;
495 break;
496 case OBJ_TAG:
497 tag = (struct tag *)e->item;
499 /* handle nested tags */
500 while (tag && tag->object.type == OBJ_TAG) {
501 parse_object(tag->object.sha1);
502 string_list_append(extra_refs, full_name)->util = tag;
503 tag = (struct tag *)tag->tagged;
505 if (!tag)
506 die ("Tag %s points nowhere?", e->name);
507 switch(tag->object.type) {
508 case OBJ_COMMIT:
509 commit = (struct commit *)tag;
510 break;
511 case OBJ_BLOB:
512 handle_object(tag->object.sha1);
513 continue;
514 default: /* OBJ_TAG (nested tags) is already handled */
515 warning("Tag points to object of unexpected type %s, skipping.",
516 typename(tag->object.type));
517 continue;
519 break;
520 default:
521 warning("%s: Unexpected object of type %s, skipping.",
522 e->name,
523 typename(e->item->type));
524 continue;
526 if (commit->util)
527 /* more than one name for the same object */
528 string_list_append(extra_refs, full_name)->util = commit;
529 else
530 commit->util = full_name;
534 static void handle_tags_and_duplicates(struct string_list *extra_refs)
536 struct commit *commit;
537 int i;
539 for (i = extra_refs->nr - 1; i >= 0; i--) {
540 const char *name = extra_refs->items[i].string;
541 struct object *object = extra_refs->items[i].util;
542 switch (object->type) {
543 case OBJ_TAG:
544 handle_tag(name, (struct tag *)object);
545 break;
546 case OBJ_COMMIT:
547 /* create refs pointing to already seen commits */
548 commit = (struct commit *)object;
549 printf("reset %s\nfrom :%d\n\n", name,
550 get_object_mark(&commit->object));
551 show_progress();
552 break;
557 static void export_marks(char *file)
559 unsigned int i;
560 uint32_t mark;
561 struct object_decoration *deco = idnums.hash;
562 FILE *f;
563 int e = 0;
565 f = fopen(file, "w");
566 if (!f)
567 die_errno("Unable to open marks file %s for writing.", file);
569 for (i = 0; i < idnums.size; i++) {
570 if (deco->base && deco->base->type == 1) {
571 mark = ptr_to_mark(deco->decoration);
572 if (fprintf(f, ":%"PRIu32" %s\n", mark,
573 sha1_to_hex(deco->base->sha1)) < 0) {
574 e = 1;
575 break;
578 deco++;
581 e |= ferror(f);
582 e |= fclose(f);
583 if (e)
584 error("Unable to write marks file %s.", file);
587 static void import_marks(char *input_file)
589 char line[512];
590 FILE *f = fopen(input_file, "r");
591 if (!f)
592 die_errno("cannot read '%s'", input_file);
594 while (fgets(line, sizeof(line), f)) {
595 uint32_t mark;
596 char *line_end, *mark_end;
597 unsigned char sha1[20];
598 struct object *object;
600 line_end = strchr(line, '\n');
601 if (line[0] != ':' || !line_end)
602 die("corrupt mark line: %s", line);
603 *line_end = '\0';
605 mark = strtoumax(line + 1, &mark_end, 10);
606 if (!mark || mark_end == line + 1
607 || *mark_end != ' ' || get_sha1(mark_end + 1, sha1))
608 die("corrupt mark line: %s", line);
610 object = parse_object(sha1);
611 if (!object)
612 die ("Could not read blob %s", sha1_to_hex(sha1));
614 if (object->flags & SHOWN)
615 error("Object %s already has a mark", sha1_to_hex(sha1));
617 mark_object(object, mark);
618 if (last_idnum < mark)
619 last_idnum = mark;
621 object->flags |= SHOWN;
623 fclose(f);
626 int cmd_fast_export(int argc, const char **argv, const char *prefix)
628 struct rev_info revs;
629 struct object_array commits = OBJECT_ARRAY_INIT;
630 struct string_list extra_refs = STRING_LIST_INIT_NODUP;
631 struct commit *commit;
632 char *export_filename = NULL, *import_filename = NULL;
633 struct option options[] = {
634 OPT_INTEGER(0, "progress", &progress,
635 N_("show progress after <n> objects")),
636 OPT_CALLBACK(0, "signed-tags", &signed_tag_mode, N_("mode"),
637 N_("select handling of signed tags"),
638 parse_opt_signed_tag_mode),
639 OPT_CALLBACK(0, "tag-of-filtered-object", &tag_of_filtered_mode, N_("mode"),
640 N_("select handling of tags that tag filtered objects"),
641 parse_opt_tag_of_filtered_mode),
642 OPT_STRING(0, "export-marks", &export_filename, N_("file"),
643 N_("Dump marks to this file")),
644 OPT_STRING(0, "import-marks", &import_filename, N_("file"),
645 N_("Import marks from this file")),
646 OPT_BOOLEAN(0, "fake-missing-tagger", &fake_missing_tagger,
647 N_("Fake a tagger when tags lack one")),
648 OPT_BOOLEAN(0, "full-tree", &full_tree,
649 N_("Output full tree for each commit")),
650 OPT_BOOLEAN(0, "use-done-feature", &use_done_feature,
651 N_("Use the done feature to terminate the stream")),
652 OPT_BOOL(0, "no-data", &no_data, N_("Skip output of blob data")),
653 OPT_END()
656 if (argc == 1)
657 usage_with_options (fast_export_usage, options);
659 /* we handle encodings */
660 git_config(git_default_config, NULL);
662 init_revisions(&revs, prefix);
663 revs.topo_order = 1;
664 revs.show_source = 1;
665 revs.rewrite_parents = 1;
666 argc = setup_revisions(argc, argv, &revs, NULL);
667 argc = parse_options(argc, argv, prefix, options, fast_export_usage, 0);
668 if (argc > 1)
669 usage_with_options (fast_export_usage, options);
671 if (use_done_feature)
672 printf("feature done\n");
674 if (import_filename)
675 import_marks(import_filename);
677 if (import_filename && revs.prune_data.nr)
678 full_tree = 1;
680 get_tags_and_duplicates(&revs.pending, &extra_refs);
682 if (prepare_revision_walk(&revs))
683 die("revision walk setup failed");
684 revs.diffopt.format_callback = show_filemodify;
685 DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
686 while ((commit = get_revision(&revs))) {
687 if (has_unshown_parent(commit)) {
688 add_object_array(&commit->object, NULL, &commits);
690 else {
691 handle_commit(commit, &revs);
692 handle_tail(&commits, &revs);
696 handle_tags_and_duplicates(&extra_refs);
698 if (export_filename)
699 export_marks(export_filename);
701 if (use_done_feature)
702 printf("done\n");
704 return 0;