Merge branch 'jt/fast-export-copy-modify-fix' into maint
[git/git.git] / builtin / fast-export.c
CommitLineData
f2dc849e
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1/*
2 * "git fast-export" builtin command
3 *
4 * Copyright (C) 2007 Johannes E. Schindelin
5 */
6#include "builtin.h"
7#include "cache.h"
b2141fc1 8#include "config.h"
fb58c8d5 9#include "refs.h"
f2dc849e
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10#include "commit.h"
11#include "object.h"
12#include "tag.h"
13#include "diff.h"
14#include "diffcore.h"
15#include "log-tree.h"
16#include "revision.h"
17#include "decorate.h"
c455c87c 18#include "string-list.h"
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19#include "utf8.h"
20#include "parse-options.h"
6280dfdc 21#include "quote.h"
03e9010c 22#include "remote.h"
a8722750 23#include "blob.h"
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24
25static const char *fast_export_usage[] = {
3b787b96 26 N_("git fast-export [rev-list-opts]"),
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27 NULL
28};
29
30static int progress;
cd16c59b 31static enum { ABORT, VERBATIM, WARN, WARN_STRIP, STRIP } signed_tag_mode = ABORT;
d7a10c31 32static enum { ERROR, DROP, REWRITE } tag_of_filtered_mode = ERROR;
4e46a8d6 33static int fake_missing_tagger;
82670a5c 34static int use_done_feature;
79559f27 35static int no_data;
7f40ab09 36static int full_tree;
1d844ee7 37static struct string_list extra_refs = STRING_LIST_INIT_NODUP;
03e9010c
FC
38static struct refspec *refspecs;
39static int refspecs_nr;
a8722750 40static int anonymize;
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41
42static int parse_opt_signed_tag_mode(const struct option *opt,
43 const char *arg, int unset)
44{
45 if (unset || !strcmp(arg, "abort"))
46 signed_tag_mode = ABORT;
ee4bc371
JS
47 else if (!strcmp(arg, "verbatim") || !strcmp(arg, "ignore"))
48 signed_tag_mode = VERBATIM;
f2dc849e
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49 else if (!strcmp(arg, "warn"))
50 signed_tag_mode = WARN;
cd16c59b
JK
51 else if (!strcmp(arg, "warn-strip"))
52 signed_tag_mode = WARN_STRIP;
f2dc849e
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53 else if (!strcmp(arg, "strip"))
54 signed_tag_mode = STRIP;
55 else
04a74b6c 56 return error("Unknown signed-tags mode: %s", arg);
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57 return 0;
58}
59
2d8ad469
EN
60static int parse_opt_tag_of_filtered_mode(const struct option *opt,
61 const char *arg, int unset)
62{
63 if (unset || !strcmp(arg, "abort"))
d7a10c31 64 tag_of_filtered_mode = ERROR;
2d8ad469
EN
65 else if (!strcmp(arg, "drop"))
66 tag_of_filtered_mode = DROP;
67 else if (!strcmp(arg, "rewrite"))
68 tag_of_filtered_mode = REWRITE;
69 else
70 return error("Unknown tag-of-filtered mode: %s", arg);
71 return 0;
72}
73
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74static struct decoration idnums;
75static uint32_t last_idnum;
76
77static int has_unshown_parent(struct commit *commit)
78{
79 struct commit_list *parent;
80
81 for (parent = commit->parents; parent; parent = parent->next)
82 if (!(parent->item->object.flags & SHOWN) &&
83 !(parent->item->object.flags & UNINTERESTING))
84 return 1;
85 return 0;
86}
87
a8722750
JK
88struct anonymized_entry {
89 struct hashmap_entry hash;
90 const char *orig;
91 size_t orig_len;
92 const char *anon;
93 size_t anon_len;
94};
95
7663cdc8
SB
96static int anonymized_entry_cmp(const void *unused_cmp_data,
97 const void *va, const void *vb,
98 const void *unused_keydata)
a8722750
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99{
100 const struct anonymized_entry *a = va, *b = vb;
101 return a->orig_len != b->orig_len ||
102 memcmp(a->orig, b->orig, a->orig_len);
103}
104
105/*
106 * Basically keep a cache of X->Y so that we can repeatedly replace
107 * the same anonymized string with another. The actual generation
108 * is farmed out to the generate function.
109 */
110static const void *anonymize_mem(struct hashmap *map,
111 void *(*generate)(const void *, size_t *),
112 const void *orig, size_t *len)
113{
114 struct anonymized_entry key, *ret;
115
116 if (!map->cmpfn)
7663cdc8 117 hashmap_init(map, anonymized_entry_cmp, NULL, 0);
a8722750
JK
118
119 hashmap_entry_init(&key, memhash(orig, *len));
120 key.orig = orig;
121 key.orig_len = *len;
122 ret = hashmap_get(map, &key, NULL);
123
124 if (!ret) {
125 ret = xmalloc(sizeof(*ret));
126 hashmap_entry_init(&ret->hash, key.hash.hash);
127 ret->orig = xstrdup(orig);
128 ret->orig_len = *len;
129 ret->anon = generate(orig, len);
130 ret->anon_len = *len;
131 hashmap_put(map, ret);
132 }
133
134 *len = ret->anon_len;
135 return ret->anon;
136}
137
138/*
139 * We anonymize each component of a path individually,
140 * so that paths a/b and a/c will share a common root.
141 * The paths are cached via anonymize_mem so that repeated
142 * lookups for "a" will yield the same value.
143 */
144static void anonymize_path(struct strbuf *out, const char *path,
145 struct hashmap *map,
146 void *(*generate)(const void *, size_t *))
147{
148 while (*path) {
149 const char *end_of_component = strchrnul(path, '/');
150 size_t len = end_of_component - path;
151 const char *c = anonymize_mem(map, generate, path, &len);
152 strbuf_add(out, c, len);
153 path = end_of_component;
154 if (*path)
155 strbuf_addch(out, *path++);
156 }
157}
158
f2dc849e 159/* Since intptr_t is C99, we do not use it here */
df6a7ff7 160static inline uint32_t *mark_to_ptr(uint32_t mark)
f2dc849e 161{
df6a7ff7
PB
162 return ((uint32_t *)NULL) + mark;
163}
164
165static inline uint32_t ptr_to_mark(void * mark)
166{
167 return (uint32_t *)mark - (uint32_t *)NULL;
168}
169
170static inline void mark_object(struct object *object, uint32_t mark)
171{
172 add_decoration(&idnums, object, mark_to_ptr(mark));
173}
174
175static inline void mark_next_object(struct object *object)
176{
177 mark_object(object, ++last_idnum);
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178}
179
180static int get_object_mark(struct object *object)
181{
182 void *decoration = lookup_decoration(&idnums, object);
183 if (!decoration)
184 return 0;
df6a7ff7 185 return ptr_to_mark(decoration);
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186}
187
188static void show_progress(void)
189{
190 static int counter = 0;
191 if (!progress)
192 return;
193 if ((++counter % progress) == 0)
194 printf("progress %d objects\n", counter);
195}
196
a8722750
JK
197/*
198 * Ideally we would want some transformation of the blob data here
199 * that is unreversible, but would still be the same size and have
200 * the same data relationship to other blobs (so that we get the same
201 * delta and packing behavior as the original). But the first and last
202 * requirements there are probably mutually exclusive, so let's take
203 * the easy way out for now, and just generate arbitrary content.
204 *
205 * There's no need to cache this result with anonymize_mem, since
206 * we already handle blob content caching with marks.
207 */
208static char *anonymize_blob(unsigned long *size)
209{
210 static int counter;
211 struct strbuf out = STRBUF_INIT;
212 strbuf_addf(&out, "anonymous blob %d", counter++);
213 *size = out.len;
214 return strbuf_detach(&out, NULL);
215}
216
273f8ee8 217static void export_blob(const struct object_id *oid)
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JS
218{
219 unsigned long size;
220 enum object_type type;
221 char *buf;
222 struct object *object;
30b939c3 223 int eaten;
f2dc849e 224
79559f27
GI
225 if (no_data)
226 return;
227
273f8ee8 228 if (is_null_oid(oid))
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229 return;
230
273f8ee8 231 object = lookup_object(oid->hash);
30b939c3 232 if (object && object->flags & SHOWN)
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233 return;
234
a8722750
JK
235 if (anonymize) {
236 buf = anonymize_blob(&size);
3aca1fc6 237 object = (struct object *)lookup_blob(oid);
a8722750
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238 eaten = 0;
239 } else {
273f8ee8 240 buf = read_sha1_file(oid->hash, &type, &size);
a8722750 241 if (!buf)
273f8ee8 242 die ("Could not read blob %s", oid_to_hex(oid));
243 if (check_sha1_signature(oid->hash, buf, size, typename(type)) < 0)
244 die("sha1 mismatch in blob %s", oid_to_hex(oid));
c251c83d 245 object = parse_object_buffer(oid, type, size, buf, &eaten);
a8722750
JK
246 }
247
30b939c3 248 if (!object)
273f8ee8 249 die("Could not read blob %s", oid_to_hex(oid));
f2dc849e 250
df6a7ff7 251 mark_next_object(object);
f2dc849e 252
6e1c2344 253 printf("blob\nmark :%"PRIu32"\ndata %lu\n", last_idnum, size);
b0fe0d72 254 if (size && fwrite(buf, size, 1, stdout) != 1)
273f8ee8 255 die_errno ("Could not write blob '%s'", oid_to_hex(oid));
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256 printf("\n");
257
258 show_progress();
259
260 object->flags |= SHOWN;
30b939c3
JK
261 if (!eaten)
262 free(buf);
f2dc849e
JS
263}
264
060df624
EN
265static int depth_first(const void *a_, const void *b_)
266{
267 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
268 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
269 const char *name_a, *name_b;
270 int len_a, len_b, len;
271 int cmp;
272
273 name_a = a->one ? a->one->path : a->two->path;
274 name_b = b->one ? b->one->path : b->two->path;
275
276 len_a = strlen(name_a);
277 len_b = strlen(name_b);
278 len = (len_a < len_b) ? len_a : len_b;
279
280 /* strcmp will sort 'd' before 'd/e', we want 'd/e' before 'd' */
281 cmp = memcmp(name_a, name_b, len);
282 if (cmp)
283 return cmp;
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284 cmp = len_b - len_a;
285 if (cmp)
286 return cmp;
287 /*
288 * Move 'R'ename entries last so that all references of the file
289 * appear in the output before it is renamed (e.g., when a file
290 * was copied and renamed in the same commit).
291 */
292 return (a->status == 'R') - (b->status == 'R');
060df624
EN
293}
294
a8722750 295static void print_path_1(const char *path)
6280dfdc
JK
296{
297 int need_quote = quote_c_style(path, NULL, NULL, 0);
298 if (need_quote)
299 quote_c_style(path, NULL, stdout, 0);
ff59f6da
JS
300 else if (strchr(path, ' '))
301 printf("\"%s\"", path);
6280dfdc
JK
302 else
303 printf("%s", path);
304}
305
a8722750
JK
306static void *anonymize_path_component(const void *path, size_t *len)
307{
308 static int counter;
309 struct strbuf out = STRBUF_INIT;
310 strbuf_addf(&out, "path%d", counter++);
311 return strbuf_detach(&out, len);
312}
313
314static void print_path(const char *path)
315{
316 if (!anonymize)
317 print_path_1(path);
318 else {
319 static struct hashmap paths;
320 static struct strbuf anon = STRBUF_INIT;
321
322 anonymize_path(&anon, path, &paths, anonymize_path_component);
323 print_path_1(anon.buf);
324 strbuf_reset(&anon);
325 }
326}
327
273f8ee8 328static void *generate_fake_oid(const void *old, size_t *len)
a8722750
JK
329{
330 static uint32_t counter = 1; /* avoid null sha1 */
273f8ee8 331 unsigned char *out = xcalloc(GIT_SHA1_RAWSZ, 1);
332 put_be32(out + GIT_SHA1_RAWSZ - 4, counter++);
a8722750
JK
333 return out;
334}
335
273f8ee8 336static const unsigned char *anonymize_sha1(const struct object_id *oid)
a8722750
JK
337{
338 static struct hashmap sha1s;
273f8ee8 339 size_t len = GIT_SHA1_RAWSZ;
340 return anonymize_mem(&sha1s, generate_fake_oid, oid, &len);
a8722750
JK
341}
342
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343static void show_filemodify(struct diff_queue_struct *q,
344 struct diff_options *options, void *data)
345{
346 int i;
b3e8ca89 347 struct string_list *changed = data;
060df624
EN
348
349 /*
350 * Handle files below a directory first, in case they are all deleted
351 * and the directory changes to a file or symlink.
352 */
9ed0d8d6 353 QSORT(q->queue, q->nr, depth_first);
060df624 354
f2dc849e 355 for (i = 0; i < q->nr; i++) {
ae7c5dce 356 struct diff_filespec *ospec = q->queue[i]->one;
f2dc849e 357 struct diff_filespec *spec = q->queue[i]->two;
ae7c5dce
AG
358
359 switch (q->queue[i]->status) {
360 case DIFF_STATUS_DELETED:
6280dfdc
JK
361 printf("D ");
362 print_path(spec->path);
b3e8ca89 363 string_list_insert(changed, spec->path);
6280dfdc 364 putchar('\n');
ae7c5dce
AG
365 break;
366
367 case DIFF_STATUS_COPIED:
368 case DIFF_STATUS_RENAMED:
b3e8ca89
JT
369 /*
370 * If a change in the file corresponding to ospec->path
371 * has been observed, we cannot trust its contents
372 * because the diff is calculated based on the prior
373 * contents, not the current contents. So, declare a
374 * copy or rename only if there was no change observed.
375 */
376 if (!string_list_has_string(changed, ospec->path)) {
377 printf("%c ", q->queue[i]->status);
378 print_path(ospec->path);
379 putchar(' ');
380 print_path(spec->path);
381 string_list_insert(changed, spec->path);
382 putchar('\n');
383
384 if (!oidcmp(&ospec->oid, &spec->oid) &&
385 ospec->mode == spec->mode)
386 break;
387 }
ae7c5dce
AG
388 /* fallthrough */
389
390 case DIFF_STATUS_TYPE_CHANGED:
391 case DIFF_STATUS_MODIFIED:
392 case DIFF_STATUS_ADDED:
03db4525
AG
393 /*
394 * Links refer to objects in another repositories;
395 * output the SHA-1 verbatim.
396 */
79559f27 397 if (no_data || S_ISGITLINK(spec->mode))
6280dfdc 398 printf("M %06o %s ", spec->mode,
a8722750 399 sha1_to_hex(anonymize ?
273f8ee8 400 anonymize_sha1(&spec->oid) :
a0d12c44 401 spec->oid.hash));
03db4525 402 else {
a0d12c44 403 struct object *object = lookup_object(spec->oid.hash);
6280dfdc
JK
404 printf("M %06o :%d ", spec->mode,
405 get_object_mark(object));
03db4525 406 }
6280dfdc 407 print_path(spec->path);
b3e8ca89 408 string_list_insert(changed, spec->path);
6280dfdc 409 putchar('\n');
ae7c5dce
AG
410 break;
411
412 default:
413 die("Unexpected comparison status '%c' for %s, %s",
414 q->queue[i]->status,
415 ospec->path ? ospec->path : "none",
416 spec->path ? spec->path : "none");
f2dc849e
JS
417 }
418 }
419}
420
421static const char *find_encoding(const char *begin, const char *end)
422{
423 const char *needle = "\nencoding ";
424 char *bol, *eol;
425
426 bol = memmem(begin, end ? end - begin : strlen(begin),
427 needle, strlen(needle));
428 if (!bol)
429 return git_commit_encoding;
430 bol += strlen(needle);
431 eol = strchrnul(bol, '\n');
432 *eol = '\0';
433 return bol;
434}
435
a8722750
JK
436static void *anonymize_ref_component(const void *old, size_t *len)
437{
438 static int counter;
439 struct strbuf out = STRBUF_INIT;
440 strbuf_addf(&out, "ref%d", counter++);
441 return strbuf_detach(&out, len);
442}
443
444static const char *anonymize_refname(const char *refname)
445{
446 /*
447 * If any of these prefixes is found, we will leave it intact
448 * so that tags remain tags and so forth.
449 */
450 static const char *prefixes[] = {
451 "refs/heads/",
452 "refs/tags/",
453 "refs/remotes/",
454 "refs/"
455 };
456 static struct hashmap refs;
457 static struct strbuf anon = STRBUF_INIT;
458 int i;
459
460 /*
461 * We also leave "master" as a special case, since it does not reveal
462 * anything interesting.
463 */
464 if (!strcmp(refname, "refs/heads/master"))
465 return refname;
466
467 strbuf_reset(&anon);
468 for (i = 0; i < ARRAY_SIZE(prefixes); i++) {
469 if (skip_prefix(refname, prefixes[i], &refname)) {
470 strbuf_addstr(&anon, prefixes[i]);
471 break;
472 }
473 }
474
475 anonymize_path(&anon, refname, &refs, anonymize_ref_component);
476 return anon.buf;
477}
478
479/*
480 * We do not even bother to cache commit messages, as they are unlikely
481 * to be repeated verbatim, and it is not that interesting when they are.
482 */
483static char *anonymize_commit_message(const char *old)
484{
485 static int counter;
486 return xstrfmt("subject %d\n\nbody\n", counter++);
487}
488
489static struct hashmap idents;
490static void *anonymize_ident(const void *old, size_t *len)
491{
492 static int counter;
493 struct strbuf out = STRBUF_INIT;
494 strbuf_addf(&out, "User %d <user%d@example.com>", counter, counter);
495 counter++;
496 return strbuf_detach(&out, len);
497}
498
499/*
500 * Our strategy here is to anonymize the names and email addresses,
501 * but keep timestamps intact, as they influence things like traversal
502 * order (and by themselves should not be too revealing).
503 */
504static void anonymize_ident_line(const char **beg, const char **end)
505{
506 static struct strbuf buffers[] = { STRBUF_INIT, STRBUF_INIT };
507 static unsigned which_buffer;
508
509 struct strbuf *out;
510 struct ident_split split;
511 const char *end_of_header;
512
513 out = &buffers[which_buffer++];
514 which_buffer %= ARRAY_SIZE(buffers);
515 strbuf_reset(out);
516
517 /* skip "committer", "author", "tagger", etc */
518 end_of_header = strchr(*beg, ' ');
519 if (!end_of_header)
520 die("BUG: malformed line fed to anonymize_ident_line: %.*s",
521 (int)(*end - *beg), *beg);
522 end_of_header++;
523 strbuf_add(out, *beg, end_of_header - *beg);
524
525 if (!split_ident_line(&split, end_of_header, *end - end_of_header) &&
526 split.date_begin) {
527 const char *ident;
528 size_t len;
529
530 len = split.mail_end - split.name_begin;
531 ident = anonymize_mem(&idents, anonymize_ident,
532 split.name_begin, &len);
533 strbuf_add(out, ident, len);
534 strbuf_addch(out, ' ');
535 strbuf_add(out, split.date_begin, split.tz_end - split.date_begin);
536 } else {
537 strbuf_addstr(out, "Malformed Ident <malformed@example.com> 0 -0000");
538 }
539
540 *beg = out->buf;
541 *end = out->buf + out->len;
542}
543
b3e8ca89
JT
544static void handle_commit(struct commit *commit, struct rev_info *rev,
545 struct string_list *paths_of_changed_objects)
f2dc849e
JS
546{
547 int saved_output_format = rev->diffopt.output_format;
bc6b8fc1 548 const char *commit_buffer;
f2dc849e
JS
549 const char *author, *author_end, *committer, *committer_end;
550 const char *encoding, *message;
551 char *reencoded = NULL;
552 struct commit_list *p;
a8722750 553 const char *refname;
f2dc849e
JS
554 int i;
555
556 rev->diffopt.output_format = DIFF_FORMAT_CALLBACK;
557
683ff884 558 parse_commit_or_die(commit);
8597ea3a 559 commit_buffer = get_commit_buffer(commit, NULL);
bc6b8fc1 560 author = strstr(commit_buffer, "\nauthor ");
f2dc849e
JS
561 if (!author)
562 die ("Could not find author in commit %s",
f2fd0760 563 oid_to_hex(&commit->object.oid));
f2dc849e
JS
564 author++;
565 author_end = strchrnul(author, '\n');
566 committer = strstr(author_end, "\ncommitter ");
567 if (!committer)
568 die ("Could not find committer in commit %s",
f2fd0760 569 oid_to_hex(&commit->object.oid));
f2dc849e
JS
570 committer++;
571 committer_end = strchrnul(committer, '\n');
572 message = strstr(committer_end, "\n\n");
573 encoding = find_encoding(committer_end, message);
574 if (message)
575 message += 2;
576
ebeec7db 577 if (commit->parents &&
4087a02e
EN
578 get_object_mark(&commit->parents->item->object) != 0 &&
579 !full_tree) {
683ff884 580 parse_commit_or_die(commit->parents->item);
66f414f8
BW
581 diff_tree_oid(&commit->parents->item->tree->object.oid,
582 &commit->tree->object.oid, "", &rev->diffopt);
f2dc849e
JS
583 }
584 else
7b8dea0c
BW
585 diff_root_tree_oid(&commit->tree->object.oid,
586 "", &rev->diffopt);
f2dc849e 587
03db4525 588 /* Export the referenced blobs, and remember the marks. */
f2dc849e 589 for (i = 0; i < diff_queued_diff.nr; i++)
03db4525 590 if (!S_ISGITLINK(diff_queued_diff.queue[i]->two->mode))
273f8ee8 591 export_blob(&diff_queued_diff.queue[i]->two->oid);
f2dc849e 592
a8722750
JK
593 refname = commit->util;
594 if (anonymize) {
595 refname = anonymize_refname(refname);
596 anonymize_ident_line(&committer, &committer_end);
597 anonymize_ident_line(&author, &author_end);
598 }
599
df6a7ff7 600 mark_next_object(&commit->object);
a8722750
JK
601 if (anonymize)
602 reencoded = anonymize_commit_message(message);
603 else if (!is_encoding_utf8(encoding))
f2dc849e 604 reencoded = reencode_string(message, "UTF-8", encoding);
d8933f01 605 if (!commit->parents)
a8722750 606 printf("reset %s\n", refname);
6e1c2344 607 printf("commit %s\nmark :%"PRIu32"\n%.*s\n%.*s\ndata %u\n%s",
a8722750 608 refname, last_idnum,
f2dc849e
JS
609 (int)(author_end - author), author,
610 (int)(committer_end - committer), committer,
611 (unsigned)(reencoded
612 ? strlen(reencoded) : message
613 ? strlen(message) : 0),
614 reencoded ? reencoded : message ? message : "");
8e0f7003 615 free(reencoded);
bc6b8fc1 616 unuse_commit_buffer(commit, commit_buffer);
f2dc849e
JS
617
618 for (i = 0, p = commit->parents; p; p = p->next) {
619 int mark = get_object_mark(&p->item->object);
620 if (!mark)
621 continue;
622 if (i == 0)
623 printf("from :%d\n", mark);
f2dc849e 624 else
5070b49e 625 printf("merge :%d\n", mark);
f2dc849e
JS
626 i++;
627 }
f2dc849e 628
4087a02e
EN
629 if (full_tree)
630 printf("deleteall\n");
f2dc849e 631 log_tree_diff_flush(rev);
b3e8ca89 632 string_list_clear(paths_of_changed_objects, 0);
f2dc849e
JS
633 rev->diffopt.output_format = saved_output_format;
634
635 printf("\n");
636
637 show_progress();
638}
639
a8722750
JK
640static void *anonymize_tag(const void *old, size_t *len)
641{
642 static int counter;
643 struct strbuf out = STRBUF_INIT;
644 strbuf_addf(&out, "tag message %d", counter++);
645 return strbuf_detach(&out, len);
646}
647
b3e8ca89
JT
648static void handle_tail(struct object_array *commits, struct rev_info *revs,
649 struct string_list *paths_of_changed_objects)
f2dc849e
JS
650{
651 struct commit *commit;
652 while (commits->nr) {
653 commit = (struct commit *)commits->objects[commits->nr - 1].item;
654 if (has_unshown_parent(commit))
655 return;
b3e8ca89 656 handle_commit(commit, revs, paths_of_changed_objects);
f2dc849e
JS
657 commits->nr--;
658 }
659}
660
661static void handle_tag(const char *name, struct tag *tag)
662{
663 unsigned long size;
664 enum object_type type;
665 char *buf;
666 const char *tagger, *tagger_end, *message;
667 size_t message_size = 0;
02c48cd6 668 struct object *tagged;
2d8ad469
EN
669 int tagged_mark;
670 struct commit *p;
02c48cd6 671
98e023de 672 /* Trees have no identifier in fast-export output, thus we have no way
02c48cd6
EN
673 * to output tags of trees, tags of tags of trees, etc. Simply omit
674 * such tags.
675 */
676 tagged = tag->tagged;
677 while (tagged->type == OBJ_TAG) {
678 tagged = ((struct tag *)tagged)->tagged;
679 }
680 if (tagged->type == OBJ_TREE) {
681 warning("Omitting tag %s,\nsince tags of trees (or tags of tags of trees, etc.) are not supported.",
f2fd0760 682 oid_to_hex(&tag->object.oid));
02c48cd6
EN
683 return;
684 }
f2dc849e 685
ed1c9977 686 buf = read_sha1_file(tag->object.oid.hash, &type, &size);
f2dc849e 687 if (!buf)
f2fd0760 688 die ("Could not read tag %s", oid_to_hex(&tag->object.oid));
f2dc849e
JS
689 message = memmem(buf, size, "\n\n", 2);
690 if (message) {
691 message += 2;
692 message_size = strlen(message);
693 }
694 tagger = memmem(buf, message ? message - buf : size, "\ntagger ", 8);
4e46a8d6
JS
695 if (!tagger) {
696 if (fake_missing_tagger)
697 tagger = "tagger Unspecified Tagger "
698 "<unspecified-tagger> 0 +0000";
699 else
700 tagger = "";
701 tagger_end = tagger + strlen(tagger);
702 } else {
703 tagger++;
704 tagger_end = strchrnul(tagger, '\n');
a8722750
JK
705 if (anonymize)
706 anonymize_ident_line(&tagger, &tagger_end);
707 }
708
709 if (anonymize) {
710 name = anonymize_refname(name);
711 if (message) {
712 static struct hashmap tags;
713 message = anonymize_mem(&tags, anonymize_tag,
714 message, &message_size);
715 }
4e46a8d6 716 }
f2dc849e
JS
717
718 /* handle signed tags */
719 if (message) {
720 const char *signature = strstr(message,
721 "\n-----BEGIN PGP SIGNATURE-----\n");
722 if (signature)
723 switch(signed_tag_mode) {
724 case ABORT:
725 die ("Encountered signed tag %s; use "
04a74b6c 726 "--signed-tags=<mode> to handle it.",
f2fd0760 727 oid_to_hex(&tag->object.oid));
f2dc849e
JS
728 case WARN:
729 warning ("Exporting signed tag %s",
f2fd0760 730 oid_to_hex(&tag->object.oid));
f2dc849e 731 /* fallthru */
ee4bc371 732 case VERBATIM:
f2dc849e 733 break;
cd16c59b
JK
734 case WARN_STRIP:
735 warning ("Stripping signature from tag %s",
f2fd0760 736 oid_to_hex(&tag->object.oid));
cd16c59b 737 /* fallthru */
f2dc849e
JS
738 case STRIP:
739 message_size = signature + 1 - message;
740 break;
741 }
742 }
743
2d8ad469
EN
744 /* handle tag->tagged having been filtered out due to paths specified */
745 tagged = tag->tagged;
746 tagged_mark = get_object_mark(tagged);
747 if (!tagged_mark) {
748 switch(tag_of_filtered_mode) {
749 case ABORT:
750 die ("Tag %s tags unexported object; use "
751 "--tag-of-filtered-object=<mode> to handle it.",
f2fd0760 752 oid_to_hex(&tag->object.oid));
2d8ad469
EN
753 case DROP:
754 /* Ignore this tag altogether */
1efb1e9a 755 free(buf);
2d8ad469
EN
756 return;
757 case REWRITE:
758 if (tagged->type != OBJ_COMMIT) {
759 die ("Tag %s tags unexported %s!",
f2fd0760 760 oid_to_hex(&tag->object.oid),
2d8ad469
EN
761 typename(tagged->type));
762 }
763 p = (struct commit *)tagged;
764 for (;;) {
765 if (p->parents && p->parents->next)
766 break;
767 if (p->object.flags & UNINTERESTING)
768 break;
769 if (!(p->object.flags & TREESAME))
770 break;
771 if (!p->parents)
772 die ("Can't find replacement commit for tag %s\n",
f2fd0760 773 oid_to_hex(&tag->object.oid));
2d8ad469
EN
774 p = p->parents->item;
775 }
776 tagged_mark = get_object_mark(&p->object);
777 }
778 }
779
59556548 780 if (starts_with(name, "refs/tags/"))
f2dc849e 781 name += 10;
4e46a8d6 782 printf("tag %s\nfrom :%d\n%.*s%sdata %d\n%.*s\n",
2d8ad469 783 name, tagged_mark,
f2dc849e 784 (int)(tagger_end - tagger), tagger,
4e46a8d6 785 tagger == tagger_end ? "" : "\n",
f2dc849e 786 (int)message_size, (int)message_size, message ? message : "");
1efb1e9a 787 free(buf);
f2dc849e
JS
788}
789
3e9b9cb1
FC
790static struct commit *get_commit(struct rev_cmdline_entry *e, char *full_name)
791{
792 switch (e->item->type) {
793 case OBJ_COMMIT:
794 return (struct commit *)e->item;
795 case OBJ_TAG: {
796 struct tag *tag = (struct tag *)e->item;
797
798 /* handle nested tags */
799 while (tag && tag->object.type == OBJ_TAG) {
c251c83d 800 parse_object(&tag->object.oid);
3e9b9cb1
FC
801 string_list_append(&extra_refs, full_name)->util = tag;
802 tag = (struct tag *)tag->tagged;
803 }
804 if (!tag)
805 die("Tag %s points nowhere?", e->name);
806 return (struct commit *)tag;
807 break;
808 }
809 default:
810 return NULL;
811 }
812}
813
1d844ee7 814static void get_tags_and_duplicates(struct rev_cmdline_info *info)
f2dc849e 815{
f2dc849e
JS
816 int i;
817
49266e8a
FC
818 for (i = 0; i < info->nr; i++) {
819 struct rev_cmdline_entry *e = info->rev + i;
273f8ee8 820 struct object_id oid;
2d242de4 821 struct commit *commit;
f2dc849e
JS
822 char *full_name;
823
49266e8a
FC
824 if (e->flags & UNINTERESTING)
825 continue;
826
273f8ee8 827 if (dwim_ref(e->name, strlen(e->name), oid.hash, &full_name) != 1)
f2dc849e
JS
828 continue;
829
03e9010c
FC
830 if (refspecs) {
831 char *private;
832 private = apply_refspecs(refspecs, refspecs_nr, full_name);
833 if (private) {
834 free(full_name);
835 full_name = private;
836 }
837 }
838
3e9b9cb1
FC
839 commit = get_commit(e, full_name);
840 if (!commit) {
2d07f6d4
EFL
841 warning("%s: Unexpected object of type %s, skipping.",
842 e->name,
843 typename(e->item->type));
844 continue;
f2dc849e 845 }
f28e7c90 846
3e9b9cb1
FC
847 switch(commit->object.type) {
848 case OBJ_COMMIT:
849 break;
850 case OBJ_BLOB:
273f8ee8 851 export_blob(&commit->object.oid);
3e9b9cb1
FC
852 continue;
853 default: /* OBJ_TAG (nested tags) is already handled */
854 warning("Tag points to object of unexpected type %s, skipping.",
855 typename(commit->object.type));
856 continue;
857 }
858
f28e7c90
FC
859 /*
860 * This ref will not be updated through a commit, lets make
861 * sure it gets properly updated eventually.
862 */
863 if (commit->util || commit->object.flags & SHOWN)
1d844ee7 864 string_list_append(&extra_refs, full_name)->util = commit;
f28e7c90 865 if (!commit->util)
f2dc849e
JS
866 commit->util = full_name;
867 }
868}
869
1d844ee7 870static void handle_tags_and_duplicates(void)
f2dc849e
JS
871{
872 struct commit *commit;
873 int i;
874
1d844ee7
FC
875 for (i = extra_refs.nr - 1; i >= 0; i--) {
876 const char *name = extra_refs.items[i].string;
877 struct object *object = extra_refs.items[i].util;
f2dc849e
JS
878 switch (object->type) {
879 case OBJ_TAG:
880 handle_tag(name, (struct tag *)object);
881 break;
882 case OBJ_COMMIT:
a8722750
JK
883 if (anonymize)
884 name = anonymize_refname(name);
f2dc849e
JS
885 /* create refs pointing to already seen commits */
886 commit = (struct commit *)object;
887 printf("reset %s\nfrom :%d\n\n", name,
888 get_object_mark(&commit->object));
889 show_progress();
890 break;
891 }
892 }
893}
894
df6a7ff7
PB
895static void export_marks(char *file)
896{
897 unsigned int i;
898 uint32_t mark;
899 struct object_decoration *deco = idnums.hash;
900 FILE *f;
96d69b55 901 int e = 0;
df6a7ff7 902
ea56518d 903 f = fopen_for_writing(file);
df6a7ff7 904 if (!f)
bb6ad28c 905 die_errno("Unable to open marks file %s for writing.", file);
df6a7ff7 906
69913575
JH
907 for (i = 0; i < idnums.size; i++) {
908 if (deco->base && deco->base->type == 1) {
df6a7ff7 909 mark = ptr_to_mark(deco->decoration);
96d69b55 910 if (fprintf(f, ":%"PRIu32" %s\n", mark,
f2fd0760 911 oid_to_hex(&deco->base->oid)) < 0) {
96d69b55
MA
912 e = 1;
913 break;
914 }
df6a7ff7 915 }
69913575 916 deco++;
df6a7ff7
PB
917 }
918
96d69b55
MA
919 e |= ferror(f);
920 e |= fclose(f);
921 if (e)
df6a7ff7
PB
922 error("Unable to write marks file %s.", file);
923}
924
69913575 925static void import_marks(char *input_file)
df6a7ff7
PB
926{
927 char line[512];
23a9e071 928 FILE *f = xfopen(input_file, "r");
df6a7ff7
PB
929
930 while (fgets(line, sizeof(line), f)) {
931 uint32_t mark;
932 char *line_end, *mark_end;
273f8ee8 933 struct object_id oid;
df6a7ff7 934 struct object *object;
47bd9bf8 935 struct commit *commit;
e6812cfa 936 enum object_type type;
df6a7ff7
PB
937
938 line_end = strchr(line, '\n');
939 if (line[0] != ':' || !line_end)
940 die("corrupt mark line: %s", line);
69913575 941 *line_end = '\0';
df6a7ff7
PB
942
943 mark = strtoumax(line + 1, &mark_end, 10);
944 if (!mark || mark_end == line + 1
273f8ee8 945 || *mark_end != ' ' || get_oid_hex(mark_end + 1, &oid))
df6a7ff7
PB
946 die("corrupt mark line: %s", line);
947
c4458ecd
AP
948 if (last_idnum < mark)
949 last_idnum = mark;
950
273f8ee8 951 type = sha1_object_info(oid.hash, NULL);
e6812cfa 952 if (type < 0)
273f8ee8 953 die("object not found: %s", oid_to_hex(&oid));
e6812cfa
FC
954
955 if (type != OBJ_COMMIT)
956 /* only commits */
c4458ecd 957 continue;
df6a7ff7 958
bc83266a 959 commit = lookup_commit(&oid);
47bd9bf8 960 if (!commit)
273f8ee8 961 die("not a commit? can't happen: %s", oid_to_hex(&oid));
47bd9bf8
FC
962
963 object = &commit->object;
e6812cfa 964
df6a7ff7 965 if (object->flags & SHOWN)
273f8ee8 966 error("Object %s already has a mark", oid_to_hex(&oid));
df6a7ff7
PB
967
968 mark_object(object, mark);
df6a7ff7
PB
969
970 object->flags |= SHOWN;
971 }
972 fclose(f);
973}
974
60ed2643
FC
975static void handle_deletes(void)
976{
977 int i;
978 for (i = 0; i < refspecs_nr; i++) {
979 struct refspec *refspec = &refspecs[i];
980 if (*refspec->src)
981 continue;
982
983 printf("reset %s\nfrom %s\n\n",
984 refspec->dst, sha1_to_hex(null_sha1));
985 }
986}
987
f2dc849e
JS
988int cmd_fast_export(int argc, const char **argv, const char *prefix)
989{
990 struct rev_info revs;
3cd47459 991 struct object_array commits = OBJECT_ARRAY_INIT;
f2dc849e 992 struct commit *commit;
df6a7ff7 993 char *export_filename = NULL, *import_filename = NULL;
c4458ecd 994 uint32_t lastimportid;
03e9010c 995 struct string_list refspecs_list = STRING_LIST_INIT_NODUP;
b3e8ca89 996 struct string_list paths_of_changed_objects = STRING_LIST_INIT_DUP;
f2dc849e
JS
997 struct option options[] = {
998 OPT_INTEGER(0, "progress", &progress,
3b787b96
NTND
999 N_("show progress after <n> objects")),
1000 OPT_CALLBACK(0, "signed-tags", &signed_tag_mode, N_("mode"),
1001 N_("select handling of signed tags"),
f2dc849e 1002 parse_opt_signed_tag_mode),
3b787b96
NTND
1003 OPT_CALLBACK(0, "tag-of-filtered-object", &tag_of_filtered_mode, N_("mode"),
1004 N_("select handling of tags that tag filtered objects"),
2d8ad469 1005 parse_opt_tag_of_filtered_mode),
3b787b96
NTND
1006 OPT_STRING(0, "export-marks", &export_filename, N_("file"),
1007 N_("Dump marks to this file")),
1008 OPT_STRING(0, "import-marks", &import_filename, N_("file"),
1009 N_("Import marks from this file")),
d5d09d47
SB
1010 OPT_BOOL(0, "fake-missing-tagger", &fake_missing_tagger,
1011 N_("Fake a tagger when tags lack one")),
1012 OPT_BOOL(0, "full-tree", &full_tree,
1013 N_("Output full tree for each commit")),
1014 OPT_BOOL(0, "use-done-feature", &use_done_feature,
3b787b96
NTND
1015 N_("Use the done feature to terminate the stream")),
1016 OPT_BOOL(0, "no-data", &no_data, N_("Skip output of blob data")),
03e9010c
FC
1017 OPT_STRING_LIST(0, "refspec", &refspecs_list, N_("refspec"),
1018 N_("Apply refspec to exported refs")),
a8722750 1019 OPT_BOOL(0, "anonymize", &anonymize, N_("anonymize output")),
f2dc849e
JS
1020 OPT_END()
1021 };
1022
dcfdbdf0
MV
1023 if (argc == 1)
1024 usage_with_options (fast_export_usage, options);
1025
f2dc849e 1026 /* we handle encodings */
ef90d6d4 1027 git_config(git_default_config, NULL);
f2dc849e
JS
1028
1029 init_revisions(&revs, prefix);
668f3aa7 1030 revs.topo_order = 1;
2374502c 1031 revs.show_source = 1;
32164131 1032 revs.rewrite_parents = 1;
8b2f86a7
FC
1033 argc = parse_options(argc, argv, prefix, options, fast_export_usage,
1034 PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN);
f2dc849e 1035 argc = setup_revisions(argc, argv, &revs, NULL);
f2dc849e
JS
1036 if (argc > 1)
1037 usage_with_options (fast_export_usage, options);
1038
03e9010c
FC
1039 if (refspecs_list.nr) {
1040 const char **refspecs_str;
1041 int i;
1042
b32fa95f 1043 ALLOC_ARRAY(refspecs_str, refspecs_list.nr);
03e9010c
FC
1044 for (i = 0; i < refspecs_list.nr; i++)
1045 refspecs_str[i] = refspecs_list.items[i].string;
1046
1047 refspecs_nr = refspecs_list.nr;
1048 refspecs = parse_fetch_refspec(refspecs_nr, refspecs_str);
1049
1050 string_list_clear(&refspecs_list, 1);
1051 free(refspecs_str);
1052 }
1053
82670a5c
SR
1054 if (use_done_feature)
1055 printf("feature done\n");
1056
df6a7ff7
PB
1057 if (import_filename)
1058 import_marks(import_filename);
c4458ecd 1059 lastimportid = last_idnum;
df6a7ff7 1060
afe069d1 1061 if (import_filename && revs.prune_data.nr)
4087a02e
EN
1062 full_tree = 1;
1063
1d844ee7 1064 get_tags_and_duplicates(&revs.cmdline);
f2dc849e 1065
3d51e1b5
MK
1066 if (prepare_revision_walk(&revs))
1067 die("revision walk setup failed");
f2dc849e 1068 revs.diffopt.format_callback = show_filemodify;
b3e8ca89 1069 revs.diffopt.format_callback_data = &paths_of_changed_objects;
f2dc849e
JS
1070 DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
1071 while ((commit = get_revision(&revs))) {
1072 if (has_unshown_parent(commit)) {
f2dc849e 1073 add_object_array(&commit->object, NULL, &commits);
f2dc849e
JS
1074 }
1075 else {
b3e8ca89
JT
1076 handle_commit(commit, &revs, &paths_of_changed_objects);
1077 handle_tail(&commits, &revs, &paths_of_changed_objects);
f2dc849e
JS
1078 }
1079 }
1080
1d844ee7 1081 handle_tags_and_duplicates();
60ed2643 1082 handle_deletes();
f2dc849e 1083
c4458ecd 1084 if (export_filename && lastimportid != last_idnum)
df6a7ff7
PB
1085 export_marks(export_filename);
1086
82670a5c
SR
1087 if (use_done_feature)
1088 printf("done\n");
1089
03e9010c
FC
1090 free_refspec(refspecs_nr, refspecs);
1091
f2dc849e
JS
1092 return 0;
1093}