bundle: split out a helper function to compute and write prerequisites
[git/git.git] / bundle.c
CommitLineData
30415d50 1#include "cache.h"
697cc8ef 2#include "lockfile.h"
30415d50
JS
3#include "bundle.h"
4#include "object.h"
5#include "commit.h"
6#include "diff.h"
7#include "revision.h"
8#include "list-objects.h"
9#include "run-command.h"
fa303836 10#include "refs.h"
1e2371ea 11#include "argv-array.h"
30415d50
JS
12
13static const char bundle_signature[] = "# v2 git bundle\n";
14
15static void add_to_ref_list(const unsigned char *sha1, const char *name,
16 struct ref_list *list)
17{
5cbbe13a 18 ALLOC_GROW(list->list, list->nr + 1, list->alloc);
50546b15 19 hashcpy(list->list[list->nr].sha1, sha1);
30415d50
JS
20 list->list[list->nr].name = xstrdup(name);
21 list->nr++;
22}
23
2727b71f
JH
24static int parse_bundle_header(int fd, struct bundle_header *header,
25 const char *report_path)
f3fa1838 26{
e9ee84cf 27 struct strbuf buf = STRBUF_INIT;
e9ee84cf 28 int status = 0;
30415d50 29
e9ee84cf 30 /* The bundle header begins with the signature */
5e8617f5 31 if (strbuf_getwholeline_fd(&buf, fd, '\n') ||
e9ee84cf 32 strcmp(buf.buf, bundle_signature)) {
2727b71f 33 if (report_path)
8a1e7eac 34 error(_("'%s' does not look like a v2 bundle file"),
2727b71f 35 report_path);
e9ee84cf
JH
36 status = -1;
37 goto abort;
30415d50 38 }
e9ee84cf
JH
39
40 /* The bundle header ends with an empty line */
5e8617f5 41 while (!strbuf_getwholeline_fd(&buf, fd, '\n') &&
e9ee84cf 42 buf.len && buf.buf[0] != '\n') {
30415d50 43 unsigned char sha1[20];
e9ee84cf
JH
44 int is_prereq = 0;
45
46 if (*buf.buf == '-') {
47 is_prereq = 1;
48 strbuf_remove(&buf, 0, 1);
30415d50 49 }
e9ee84cf 50 strbuf_rtrim(&buf);
30415d50 51
e9ee84cf
JH
52 /*
53 * Tip lines have object name, SP, and refname.
54 * Prerequisites have object name that is optionally
55 * followed by SP and subject line.
56 */
57 if (get_sha1_hex(buf.buf, sha1) ||
5446e33f 58 (buf.len > 40 && !isspace(buf.buf[40])) ||
e9ee84cf 59 (!is_prereq && buf.len <= 40)) {
2727b71f 60 if (report_path)
8a1e7eac 61 error(_("unrecognized header: %s%s (%d)"),
2727b71f 62 (is_prereq ? "-" : ""), buf.buf, (int)buf.len);
e9ee84cf
JH
63 status = -1;
64 break;
65 } else {
66 if (is_prereq)
67 add_to_ref_list(sha1, "", &header->prerequisites);
68 else
69 add_to_ref_list(sha1, buf.buf + 41, &header->references);
30415d50 70 }
30415d50 71 }
e9ee84cf
JH
72
73 abort:
74 if (status) {
75 close(fd);
76 fd = -1;
30415d50 77 }
e9ee84cf 78 strbuf_release(&buf);
30415d50
JS
79 return fd;
80}
81
2727b71f
JH
82int read_bundle_header(const char *path, struct bundle_header *header)
83{
84 int fd = open(path, O_RDONLY);
85
30415d50 86 if (fd < 0)
8a1e7eac 87 return error(_("could not open '%s'"), path);
2727b71f
JH
88 return parse_bundle_header(fd, header, path);
89}
90
91int is_bundle(const char *path, int quiet)
92{
93 struct bundle_header header;
94 int fd = open(path, O_RDONLY);
95
96 if (fd < 0)
97 return 0;
98 memset(&header, 0, sizeof(header));
99 fd = parse_bundle_header(fd, &header, quiet ? NULL : path);
100 if (fd >= 0)
101 close(fd);
102 return (fd >= 0);
30415d50
JS
103}
104
105static int list_refs(struct ref_list *r, int argc, const char **argv)
106{
107 int i;
108
109 for (i = 0; i < r->nr; i++) {
110 if (argc > 1) {
111 int j;
112 for (j = 1; j < argc; j++)
113 if (!strcmp(r->list[i].name, argv[j]))
114 break;
115 if (j == argc)
116 continue;
117 }
118 printf("%s %s\n", sha1_to_hex(r->list[i].sha1),
119 r->list[i].name);
120 }
121 return 0;
122}
123
208acbfb 124/* Remember to update object flag allocation in object.h */
30415d50
JS
125#define PREREQ_MARK (1u<<16)
126
127int verify_bundle(struct bundle_header *header, int verbose)
128{
129 /*
130 * Do fast check, then if any prereqs are missing then go line by line
131 * to be verbose about the errors
132 */
133 struct ref_list *p = &header->prerequisites;
134 struct rev_info revs;
a80aad7b 135 const char *argv[] = {NULL, "--all", NULL};
30415d50
JS
136 struct object_array refs;
137 struct commit *commit;
138 int i, ret = 0, req_nr;
8a1e7eac 139 const char *message = _("Repository lacks these prerequisite commits:");
30415d50
JS
140
141 init_revisions(&revs, NULL);
142 for (i = 0; i < p->nr; i++) {
143 struct ref_list_entry *e = p->list + i;
144 struct object *o = parse_object(e->sha1);
145 if (o) {
146 o->flags |= PREREQ_MARK;
147 add_pending_object(&revs, o, e->name);
148 continue;
149 }
150 if (++ret == 1)
9db56f71 151 error("%s", message);
30415d50
JS
152 error("%s %s", sha1_to_hex(e->sha1), e->name);
153 }
154 if (revs.pending.nr != p->nr)
155 return ret;
156 req_nr = revs.pending.nr;
157 setup_revisions(2, argv, &revs, NULL);
158
5be78599
RS
159 refs = revs.pending;
160 revs.leak_pending = 1;
30415d50 161
3d51e1b5 162 if (prepare_revision_walk(&revs))
8a1e7eac 163 die(_("revision walk setup failed"));
30415d50
JS
164
165 i = req_nr;
166 while (i && (commit = get_revision(&revs)))
167 if (commit->object.flags & PREREQ_MARK)
168 i--;
169
170 for (i = 0; i < req_nr; i++)
171 if (!(refs.objects[i].item->flags & SHOWN)) {
172 if (++ret == 1)
9db56f71 173 error("%s", message);
30415d50
JS
174 error("%s %s", sha1_to_hex(refs.objects[i].item->sha1),
175 refs.objects[i].name);
176 }
177
86a0a408 178 clear_commit_marks_for_object_array(&refs, ALL_REV_FLAGS);
5be78599 179 free(refs.objects);
30415d50
JS
180
181 if (verbose) {
182 struct ref_list *r;
183
184 r = &header->references;
a02ffe0e
LF
185 printf_ln(Q_("The bundle contains this ref:",
186 "The bundle contains these %d refs:",
8a1e7eac
NTND
187 r->nr),
188 r->nr);
30415d50 189 list_refs(r, 0, NULL);
71ba6b10 190 r = &header->prerequisites;
8c3710fd
JH
191 if (!r->nr) {
192 printf_ln(_("The bundle records a complete history."));
193 } else {
a02ffe0e
LF
194 printf_ln(Q_("The bundle requires this ref:",
195 "The bundle requires these %d refs:",
8c3710fd
JH
196 r->nr),
197 r->nr);
198 list_refs(r, 0, NULL);
199 }
30415d50
JS
200 }
201 return ret;
202}
203
204int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
205{
206 return list_refs(&header->references, argc, argv);
207}
208
c9a42c4a
JS
209static int is_tag_in_date_range(struct object *tag, struct rev_info *revs)
210{
211 unsigned long size;
212 enum object_type type;
64045940 213 char *buf = NULL, *line, *lineend;
c9a42c4a 214 unsigned long date;
64045940 215 int result = 1;
c9a42c4a
JS
216
217 if (revs->max_age == -1 && revs->min_age == -1)
64045940 218 goto out;
c9a42c4a
JS
219
220 buf = read_sha1_file(tag->sha1, &type, &size);
221 if (!buf)
64045940 222 goto out;
c9a42c4a
JS
223 line = memmem(buf, size, "\ntagger ", 8);
224 if (!line++)
64045940 225 goto out;
2c8544ab
LF
226 lineend = memchr(line, '\n', buf + size - line);
227 line = memchr(line, '>', lineend ? lineend - line : buf + size - line);
c9a42c4a 228 if (!line++)
64045940 229 goto out;
c9a42c4a 230 date = strtoul(line, NULL, 10);
64045940 231 result = (revs->max_age == -1 || revs->max_age < date) &&
c9a42c4a 232 (revs->min_age == -1 || revs->min_age > date);
64045940
RS
233out:
234 free(buf);
235 return result;
c9a42c4a
JS
236}
237
5e626b91
JH
238static int write_pack_data(int bundle_fd, struct lock_file *lock, struct rev_info *revs)
239{
240 struct child_process pack_objects = CHILD_PROCESS_INIT;
241 int i;
242
243 argv_array_pushl(&pack_objects.args,
244 "pack-objects", "--all-progress-implied",
245 "--stdout", "--thin", "--delta-base-offset",
246 NULL);
247 pack_objects.in = -1;
248 pack_objects.out = bundle_fd;
249 pack_objects.git_cmd = 1;
250 if (start_command(&pack_objects))
251 return error(_("Could not spawn pack-objects"));
252
253 /*
254 * start_command closed bundle_fd if it was > 1
255 * so set the lock fd to -1 so commit_lock_file()
256 * won't fail trying to close it.
257 */
258 lock->fd = -1;
259
260 for (i = 0; i < revs->pending.nr; i++) {
261 struct object *object = revs->pending.objects[i].item;
262 if (object->flags & UNINTERESTING)
263 write_or_die(pack_objects.in, "^", 1);
264 write_or_die(pack_objects.in, sha1_to_hex(object->sha1), 40);
265 write_or_die(pack_objects.in, "\n", 1);
266 }
267 close(pack_objects.in);
268 if (finish_command(&pack_objects))
269 return error(_("pack-objects died"));
270 return 0;
271}
272
e8eb2512
JH
273static int compute_and_write_prerequisites(int bundle_fd,
274 struct rev_info *revs,
275 int argc, const char **argv)
30415d50 276{
d3180279 277 struct child_process rls = CHILD_PROCESS_INIT;
e8eb2512 278 struct strbuf buf = STRBUF_INIT;
30415d50 279 FILE *rls_fout;
e8eb2512 280 int i;
30415d50 281
92859f3a 282 argv_array_pushl(&rls.args,
1e2371ea
JH
283 "rev-list", "--boundary", "--pretty=oneline",
284 NULL);
285 for (i = 1; i < argc; i++)
92859f3a 286 argv_array_push(&rls.args, argv[i]);
30415d50
JS
287 rls.out = -1;
288 rls.git_cmd = 1;
289 if (start_command(&rls))
290 return -1;
41698375 291 rls_fout = xfdopen(rls.out, "r");
bc2fed49 292 while (strbuf_getwholeline(&buf, rls_fout, '\n') != EOF) {
30415d50 293 unsigned char sha1[20];
bc2fed49
TR
294 if (buf.len > 0 && buf.buf[0] == '-') {
295 write_or_die(bundle_fd, buf.buf, buf.len);
296 if (!get_sha1_hex(buf.buf + 1, sha1)) {
75a95490 297 struct object *object = parse_object_or_die(sha1, buf.buf);
30415d50 298 object->flags |= UNINTERESTING;
e8eb2512 299 add_pending_object(revs, object, buf.buf);
30415d50 300 }
bc2fed49 301 } else if (!get_sha1_hex(buf.buf, sha1)) {
75a95490 302 struct object *object = parse_object_or_die(sha1, buf.buf);
30415d50
JS
303 object->flags |= SHOWN;
304 }
305 }
bc2fed49 306 strbuf_release(&buf);
30415d50
JS
307 fclose(rls_fout);
308 if (finish_command(&rls))
8a1e7eac 309 return error(_("rev-list died"));
e8eb2512
JH
310 return 0;
311}
312
313int create_bundle(struct bundle_header *header, const char *path,
314 int argc, const char **argv)
315{
316 static struct lock_file lock;
317 int bundle_fd = -1;
318 int bundle_to_stdout;
319 int i, ref_count = 0;
320 struct rev_info revs;
321
322 bundle_to_stdout = !strcmp(path, "-");
323 if (bundle_to_stdout)
324 bundle_fd = 1;
325 else
326 bundle_fd = hold_lock_file_for_update(&lock, path,
327 LOCK_DIE_ON_ERROR);
328
329 /* write signature */
330 write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
331
332 /* init revs to list objects for pack-objects later */
333 save_commit_buffer = 0;
334 init_revisions(&revs, NULL);
335
336 /* write prerequisites */
337 if (compute_and_write_prerequisites(bundle_fd, &revs, argc, argv))
338 return -1;
30415d50
JS
339
340 /* write references */
341 argc = setup_revisions(argc, argv, &revs, NULL);
22568f0a 342
8b3dce56 343 if (argc > 1)
1be65eda 344 return error(_("unrecognized argument: %s"), argv[1]);
30415d50 345
b2a6d1c6
JH
346 object_array_remove_duplicates(&revs.pending);
347
30415d50
JS
348 for (i = 0; i < revs.pending.nr; i++) {
349 struct object_array_entry *e = revs.pending.objects + i;
350 unsigned char sha1[20];
351 char *ref;
fa303836
JH
352 const char *display_ref;
353 int flag;
30415d50
JS
354
355 if (e->item->flags & UNINTERESTING)
356 continue;
357 if (dwim_ref(e->name, strlen(e->name), sha1, &ref) != 1)
358 continue;
7695d118 359 if (read_ref_full(e->name, RESOLVE_REF_READING, sha1, &flag))
fa303836
JH
360 flag = 0;
361 display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
362
c9a42c4a
JS
363 if (e->item->type == OBJ_TAG &&
364 !is_tag_in_date_range(e->item, &revs)) {
365 e->item->flags |= UNINTERESTING;
366 continue;
367 }
368
30415d50
JS
369 /*
370 * Make sure the refs we wrote out is correct; --max-count and
371 * other limiting options could have prevented all the tips
372 * from getting output.
373 *
374 * Non commit objects such as tags and blobs do not have
375 * this issue as they are not affected by those extra
376 * constraints.
377 */
378 if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
8a1e7eac 379 warning(_("ref '%s' is excluded by the rev-list options"),
30415d50
JS
380 e->name);
381 free(ref);
382 continue;
383 }
384 /*
385 * If you run "git bundle create bndl v1.0..v2.0", the
386 * name of the positive ref is "v2.0" but that is the
387 * commit that is referenced by the tag, and not the tag
388 * itself.
389 */
390 if (hashcmp(sha1, e->item->sha1)) {
391 /*
392 * Is this the positive end of a range expressed
393 * in terms of a tag (e.g. v2.0 from the range
394 * "v1.0..v2.0")?
395 */
396 struct commit *one = lookup_commit_reference(sha1);
397 struct object *obj;
398
399 if (e->item == &(one->object)) {
400 /*
401 * Need to include e->name as an
402 * independent ref to the pack-objects
403 * input, so that the tag is included
404 * in the output; otherwise we would
405 * end up triggering "empty bundle"
406 * error.
407 */
75a95490 408 obj = parse_object_or_die(sha1, e->name);
30415d50
JS
409 obj->flags |= SHOWN;
410 add_pending_object(&revs, obj, e->name);
411 }
412 free(ref);
413 continue;
414 }
415
416 ref_count++;
417 write_or_die(bundle_fd, sha1_to_hex(e->item->sha1), 40);
418 write_or_die(bundle_fd, " ", 1);
fa303836 419 write_or_die(bundle_fd, display_ref, strlen(display_ref));
30415d50
JS
420 write_or_die(bundle_fd, "\n", 1);
421 free(ref);
422 }
423 if (!ref_count)
8a1e7eac 424 die(_("Refusing to create empty bundle."));
30415d50
JS
425
426 /* end header */
427 write_or_die(bundle_fd, "\n", 1);
428
429 /* write pack */
5e626b91
JH
430 if (write_pack_data(bundle_fd, &lock, &revs))
431 return -1;
4ed7cd3a 432
0f5cdf65
CH
433 if (!bundle_to_stdout) {
434 if (commit_lock_file(&lock))
8a1e7eac 435 die_errno(_("cannot create '%s'"), path);
0f5cdf65 436 }
c20181e3 437 return 0;
30415d50
JS
438}
439
be042aff 440int unbundle(struct bundle_header *header, int bundle_fd, int flags)
30415d50
JS
441{
442 const char *argv_index_pack[] = {"index-pack",
be042aff 443 "--fix-thin", "--stdin", NULL, NULL};
d3180279 444 struct child_process ip = CHILD_PROCESS_INIT;
30415d50 445
be042aff
JH
446 if (flags & BUNDLE_VERBOSE)
447 argv_index_pack[3] = "-v";
448
30415d50
JS
449 if (verify_bundle(header, 0))
450 return -1;
30415d50
JS
451 ip.argv = argv_index_pack;
452 ip.in = bundle_fd;
453 ip.no_stdout = 1;
454 ip.git_cmd = 1;
455 if (run_command(&ip))
8a1e7eac 456 return error(_("index-pack died"));
30415d50
JS
457 return 0;
458}