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