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"
10#include "argv-array.h"
11static const char bundle_signature[] = "# v2 git bundle\n";
13static void add_to_ref_list(const unsigned char *sha1, const char *name,
15 struct ref_list *list)
16{
17 if (list->nr + 1 >= list->alloc) {
18 list->alloc = alloc_nr(list->nr + 1);
19 list->list = xrealloc(list->list,
20 list->alloc * sizeof(list->list[0]));
21 }
22 memcpy(list->list[list->nr].sha1, sha1, 20);
23 list->list[list->nr].name = xstrdup(name);
24 list->nr++;
25}
26static int parse_bundle_header(int fd, struct bundle_header *header,
28 const char *report_path)
29{
30 struct strbuf buf = STRBUF_INIT;
31 int status = 0;
32 /* The bundle header begins with the signature */
34 if (strbuf_getwholeline_fd(&buf, fd, '\n') ||
35 strcmp(buf.buf, bundle_signature)) {
36 if (report_path)
37 error(_("'%s' does not look like a v2 bundle file"),
38 report_path);
39 status = -1;
40 goto abort;
41 }
42 /* The bundle header ends with an empty line */
44 while (!strbuf_getwholeline_fd(&buf, fd, '\n') &&
45 buf.len && buf.buf[0] != '\n') {
46 unsigned char sha1[20];
47 int is_prereq = 0;
48 if (*buf.buf == '-') {
50 is_prereq = 1;
51 strbuf_remove(&buf, 0, 1);
52 }
53 strbuf_rtrim(&buf);
54 /*
56 * Tip lines have object name, SP, and refname.
57 * Prerequisites have object name that is optionally
58 * followed by SP and subject line.
59 */
60 if (get_sha1_hex(buf.buf, sha1) ||
61 (buf.len > 40 && !isspace(buf.buf[40])) ||
62 (!is_prereq && buf.len <= 40)) {
63 if (report_path)
64 error(_("unrecognized header: %s%s (%d)"),
65 (is_prereq ? "-" : ""), buf.buf, (int)buf.len);
66 status = -1;
67 break;
68 } else {
69 if (is_prereq)
70 add_to_ref_list(sha1, "", &header->prerequisites);
71 else
72 add_to_ref_list(sha1, buf.buf + 41, &header->references);
73 }
74 }
75 abort:
77 if (status) {
78 close(fd);
79 fd = -1;
80 }
81 strbuf_release(&buf);
82 return fd;
83}
84int read_bundle_header(const char *path, struct bundle_header *header)
86{
87 int fd = open(path, O_RDONLY);
88 if (fd < 0)
90 return error(_("could not open '%s'"), path);
91 return parse_bundle_header(fd, header, path);
92}
93int is_bundle(const char *path, int quiet)
95{
96 struct bundle_header header;
97 int fd = open(path, O_RDONLY);
98 if (fd < 0)
100 return 0;
101 memset(&header, 0, sizeof(header));
102 fd = parse_bundle_header(fd, &header, quiet ? NULL : path);
103 if (fd >= 0)
104 close(fd);
105 return (fd >= 0);
106}
107static int list_refs(struct ref_list *r, int argc, const char **argv)
109{
110 int i;
111 for (i = 0; i < r->nr; i++) {
113 if (argc > 1) {
114 int j;
115 for (j = 1; j < argc; j++)
116 if (!strcmp(r->list[i].name, argv[j]))
117 break;
118 if (j == argc)
119 continue;
120 }
121 printf("%s %s\n", sha1_to_hex(r->list[i].sha1),
122 r->list[i].name);
123 }
124 return 0;
125}
126#define PREREQ_MARK (1u<<16)
128int verify_bundle(struct bundle_header *header, int verbose)
130{
131 /*
132 * Do fast check, then if any prereqs are missing then go line by line
133 * to be verbose about the errors
134 */
135 struct ref_list *p = &header->prerequisites;
136 struct rev_info revs;
137 const char *argv[] = {NULL, "--all", NULL};
138 struct object_array refs;
139 struct commit *commit;
140 int i, ret = 0, req_nr;
141 const char *message = _("Repository lacks these prerequisite commits:");
142 init_revisions(&revs, NULL);
144 for (i = 0; i < p->nr; i++) {
145 struct ref_list_entry *e = p->list + i;
146 struct object *o = parse_object(e->sha1);
147 if (o) {
148 o->flags |= PREREQ_MARK;
149 add_pending_object(&revs, o, e->name);
150 continue;
151 }
152 if (++ret == 1)
153 error("%s", message);
154 error("%s %s", sha1_to_hex(e->sha1), e->name);
155 }
156 if (revs.pending.nr != p->nr)
157 return ret;
158 req_nr = revs.pending.nr;
159 setup_revisions(2, argv, &revs, NULL);
160 refs = revs.pending;
162 revs.leak_pending = 1;
163 if (prepare_revision_walk(&revs))
165 die(_("revision walk setup failed"));
166 i = req_nr;
168 while (i && (commit = get_revision(&revs)))
169 if (commit->object.flags & PREREQ_MARK)
170 i--;
171 for (i = 0; i < req_nr; i++)
173 if (!(refs.objects[i].item->flags & SHOWN)) {
174 if (++ret == 1)
175 error("%s", message);
176 error("%s %s", sha1_to_hex(refs.objects[i].item->sha1),
177 refs.objects[i].name);
178 }
179 clear_commit_marks_for_object_array(&refs, ALL_REV_FLAGS);
181 free(refs.objects);
182 if (verbose) {
184 struct ref_list *r;
185 r = &header->references;
187 printf_ln(Q_("The bundle contains this ref:",
188 "The bundle contains these %d refs:",
189 r->nr),
190 r->nr);
191 list_refs(r, 0, NULL);
192 r = &header->prerequisites;
193 if (!r->nr) {
194 printf_ln(_("The bundle records a complete history."));
195 } else {
196 printf_ln(Q_("The bundle requires this ref:",
197 "The bundle requires these %d refs:",
198 r->nr),
199 r->nr);
200 list_refs(r, 0, NULL);
201 }
202 }
203 return ret;
204}
205int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
207{
208 return list_refs(&header->references, argc, argv);
209}
210static int is_tag_in_date_range(struct object *tag, struct rev_info *revs)
212{
213 unsigned long size;
214 enum object_type type;
215 char *buf, *line, *lineend;
216 unsigned long date;
217 if (revs->max_age == -1 && revs->min_age == -1)
219 return 1;
220 buf = read_sha1_file(tag->sha1, &type, &size);
222 if (!buf)
223 return 1;
224 line = memmem(buf, size, "\ntagger ", 8);
225 if (!line++)
226 return 1;
227 lineend = memchr(line, buf + size - line, '\n');
228 line = memchr(line, lineend ? lineend - line : buf + size - line, '>');
229 if (!line++)
230 return 1;
231 date = strtoul(line, NULL, 10);
232 free(buf);
233 return (revs->max_age == -1 || revs->max_age < date) &&
234 (revs->min_age == -1 || revs->min_age > date);
235}
236int create_bundle(struct bundle_header *header, const char *path,
238 int argc, const char **argv)
239{
240 static struct lock_file lock;
241 int bundle_fd = -1;
242 int bundle_to_stdout;
243 struct argv_array argv_boundary = ARGV_ARRAY_INIT;
244 struct argv_array argv_pack = ARGV_ARRAY_INIT;
245 int i, ref_count = 0;
246 struct strbuf buf = STRBUF_INIT;
247 struct rev_info revs;
248 struct child_process rls;
249 FILE *rls_fout;
250 bundle_to_stdout = !strcmp(path, "-");
252 if (bundle_to_stdout)
253 bundle_fd = 1;
254 else
255 bundle_fd = hold_lock_file_for_update(&lock, path,
256 LOCK_DIE_ON_ERROR);
257 /* write signature */
259 write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
260 /* init revs to list objects for pack-objects later */
262 save_commit_buffer = 0;
263 init_revisions(&revs, NULL);
264 /* write prerequisites */
266 argv_array_pushl(&argv_boundary,
267 "rev-list", "--boundary", "--pretty=oneline",
268 NULL);
269 for (i = 1; i < argc; i++)
270 argv_array_push(&argv_boundary, argv[i]);
271 memset(&rls, 0, sizeof(rls));
273 rls.argv = argv_boundary.argv;
274 rls.out = -1;
275 rls.git_cmd = 1;
276 if (start_command(&rls))
277 return -1;
278 rls_fout = xfdopen(rls.out, "r");
279 while (strbuf_getwholeline(&buf, rls_fout, '\n') != EOF) {
280 unsigned char sha1[20];
281 if (buf.len > 0 && buf.buf[0] == '-') {
282 write_or_die(bundle_fd, buf.buf, buf.len);
283 if (!get_sha1_hex(buf.buf + 1, sha1)) {
284 struct object *object = parse_object_or_die(sha1, buf.buf);
285 object->flags |= UNINTERESTING;
286 add_pending_object(&revs, object, buf.buf);
287 }
288 } else if (!get_sha1_hex(buf.buf, sha1)) {
289 struct object *object = parse_object_or_die(sha1, buf.buf);
290 object->flags |= SHOWN;
291 }
292 }
293 strbuf_release(&buf);
294 fclose(rls_fout);
295 if (finish_command(&rls))
296 return error(_("rev-list died"));
297 /* write references */
299 argc = setup_revisions(argc, argv, &revs, NULL);
300 if (argc > 1)
302 return error(_("unrecognized argument: %s"), argv[1]);
303 object_array_remove_duplicates(&revs.pending);
305 for (i = 0; i < revs.pending.nr; i++) {
307 struct object_array_entry *e = revs.pending.objects + i;
308 unsigned char sha1[20];
309 char *ref;
310 const char *display_ref;
311 int flag;
312 if (e->item->flags & UNINTERESTING)
314 continue;
315 if (dwim_ref(e->name, strlen(e->name), sha1, &ref) != 1)
316 continue;
317 if (read_ref_full(e->name, sha1, 1, &flag))
318 flag = 0;
319 display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
320 if (e->item->type == OBJ_TAG &&
322 !is_tag_in_date_range(e->item, &revs)) {
323 e->item->flags |= UNINTERESTING;
324 continue;
325 }
326 /*
328 * Make sure the refs we wrote out is correct; --max-count and
329 * other limiting options could have prevented all the tips
330 * from getting output.
331 *
332 * Non commit objects such as tags and blobs do not have
333 * this issue as they are not affected by those extra
334 * constraints.
335 */
336 if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
337 warning(_("ref '%s' is excluded by the rev-list options"),
338 e->name);
339 free(ref);
340 continue;
341 }
342 /*
343 * If you run "git bundle create bndl v1.0..v2.0", the
344 * name of the positive ref is "v2.0" but that is the
345 * commit that is referenced by the tag, and not the tag
346 * itself.
347 */
348 if (hashcmp(sha1, e->item->sha1)) {
349 /*
350 * Is this the positive end of a range expressed
351 * in terms of a tag (e.g. v2.0 from the range
352 * "v1.0..v2.0")?
353 */
354 struct commit *one = lookup_commit_reference(sha1);
355 struct object *obj;
356 if (e->item == &(one->object)) {
358 /*
359 * Need to include e->name as an
360 * independent ref to the pack-objects
361 * input, so that the tag is included
362 * in the output; otherwise we would
363 * end up triggering "empty bundle"
364 * error.
365 */
366 obj = parse_object_or_die(sha1, e->name);
367 obj->flags |= SHOWN;
368 add_pending_object(&revs, obj, e->name);
369 }
370 free(ref);
371 continue;
372 }
373 ref_count++;
375 write_or_die(bundle_fd, sha1_to_hex(e->item->sha1), 40);
376 write_or_die(bundle_fd, " ", 1);
377 write_or_die(bundle_fd, display_ref, strlen(display_ref));
378 write_or_die(bundle_fd, "\n", 1);
379 free(ref);
380 }
381 if (!ref_count)
382 die(_("Refusing to create empty bundle."));
383 /* end header */
385 write_or_die(bundle_fd, "\n", 1);
386 /* write pack */
388 argv_array_pushl(&argv_pack,
389 "pack-objects", "--all-progress-implied",
390 "--stdout", "--thin", "--delta-base-offset",
391 NULL);
392 memset(&rls, 0, sizeof(rls));
393 rls.argv = argv_pack.argv;
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}