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