1#include "cache.h"
2#include "lockfile.h"
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"
10#include "refs.h"
11#include "argv-array.h"
12static const char bundle_signature[] = "# v2 git bundle\n";
14static void add_to_ref_list(const unsigned char *sha1, const char *name,
16 struct ref_list *list)
17{
18 ALLOC_GROW(list->list, list->nr + 1, list->alloc);
19 hashcpy(list->list[list->nr].sha1, sha1);
20 list->list[list->nr].name = xstrdup(name);
21 list->nr++;
22}
23static int parse_bundle_header(int fd, struct bundle_header *header,
25 const char *report_path)
26{
27 struct strbuf buf = STRBUF_INIT;
28 int status = 0;
29 /* The bundle header begins with the signature */
31 if (strbuf_getwholeline_fd(&buf, fd, '\n') ||
32 strcmp(buf.buf, bundle_signature)) {
33 if (report_path)
34 error(_("'%s' does not look like a v2 bundle file"),
35 report_path);
36 status = -1;
37 goto abort;
38 }
39 /* The bundle header ends with an empty line */
41 while (!strbuf_getwholeline_fd(&buf, fd, '\n') &&
42 buf.len && buf.buf[0] != '\n') {
43 unsigned char sha1[20];
44 int is_prereq = 0;
45 if (*buf.buf == '-') {
47 is_prereq = 1;
48 strbuf_remove(&buf, 0, 1);
49 }
50 strbuf_rtrim(&buf);
51 /*
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) ||
58 (buf.len > 40 && !isspace(buf.buf[40])) ||
59 (!is_prereq && buf.len <= 40)) {
60 if (report_path)
61 error(_("unrecognized header: %s%s (%d)"),
62 (is_prereq ? "-" : ""), buf.buf, (int)buf.len);
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);
70 }
71 }
72 abort:
74 if (status) {
75 close(fd);
76 fd = -1;
77 }
78 strbuf_release(&buf);
79 return fd;
80}
81int read_bundle_header(const char *path, struct bundle_header *header)
83{
84 int fd = open(path, O_RDONLY);
85 if (fd < 0)
87 return error(_("could not open '%s'"), path);
88 return parse_bundle_header(fd, header, path);
89}
90int is_bundle(const char *path, int quiet)
92{
93 struct bundle_header header;
94 int fd = open(path, O_RDONLY);
95 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);
103}
104static int list_refs(struct ref_list *r, int argc, const char **argv)
106{
107 int i;
108 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/* Remember to update object flag allocation in object.h */
125#define PREREQ_MARK (1u<<16)
126int 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;
135 const char *argv[] = {NULL, "--all", NULL};
136 struct object_array refs;
137 struct commit *commit;
138 int i, ret = 0, req_nr;
139 const char *message = _("Repository lacks these prerequisite commits:");
140 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)
151 error("%s", message);
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 refs = revs.pending;
160 revs.leak_pending = 1;
161 if (prepare_revision_walk(&revs))
163 die(_("revision walk setup failed"));
164 i = req_nr;
166 while (i && (commit = get_revision(&revs)))
167 if (commit->object.flags & PREREQ_MARK)
168 i--;
169 for (i = 0; i < req_nr; i++)
171 if (!(refs.objects[i].item->flags & SHOWN)) {
172 if (++ret == 1)
173 error("%s", message);
174 error("%s %s", sha1_to_hex(refs.objects[i].item->sha1),
175 refs.objects[i].name);
176 }
177 clear_commit_marks_for_object_array(&refs, ALL_REV_FLAGS);
179 free(refs.objects);
180 if (verbose) {
182 struct ref_list *r;
183 r = &header->references;
185 printf_ln(Q_("The bundle contains this ref:",
186 "The bundle contains these %d refs:",
187 r->nr),
188 r->nr);
189 list_refs(r, 0, NULL);
190 r = &header->prerequisites;
191 if (!r->nr) {
192 printf_ln(_("The bundle records a complete history."));
193 } else {
194 printf_ln(Q_("The bundle requires this ref:",
195 "The bundle requires these %d refs:",
196 r->nr),
197 r->nr);
198 list_refs(r, 0, NULL);
199 }
200 }
201 return ret;
202}
203int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
205{
206 return list_refs(&header->references, argc, argv);
207}
208static int is_tag_in_date_range(struct object *tag, struct rev_info *revs)
210{
211 unsigned long size;
212 enum object_type type;
213 char *buf = NULL, *line, *lineend;
214 unsigned long date;
215 int result = 1;
216 if (revs->max_age == -1 && revs->min_age == -1)
218 goto out;
219 buf = read_sha1_file(tag->sha1, &type, &size);
221 if (!buf)
222 goto out;
223 line = memmem(buf, size, "\ntagger ", 8);
224 if (!line++)
225 goto out;
226 lineend = memchr(line, '\n', buf + size - line);
227 line = memchr(line, '>', lineend ? lineend - line : buf + size - line);
228 if (!line++)
229 goto out;
230 date = strtoul(line, NULL, 10);
231 result = (revs->max_age == -1 || revs->max_age < date) &&
232 (revs->min_age == -1 || revs->min_age > date);
233out:
234 free(buf);
235 return result;
236}
237int create_bundle(struct bundle_header *header, const char *path,
239 int argc, const char **argv)
240{
241 static struct lock_file lock;
242 int bundle_fd = -1;
243 int bundle_to_stdout;
244 int i, ref_count = 0;
245 struct strbuf buf = STRBUF_INIT;
246 struct rev_info revs;
247 struct child_process rls = CHILD_PROCESS_INIT;
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 argv_array_pushl(&rls.args,
266 "rev-list", "--boundary", "--pretty=oneline",
267 NULL);
268 for (i = 1; i < argc; i++)
269 argv_array_push(&rls.args, argv[i]);
270 rls.out = -1;
271 rls.git_cmd = 1;
272 if (start_command(&rls))
273 return -1;
274 rls_fout = xfdopen(rls.out, "r");
275 while (strbuf_getwholeline(&buf, rls_fout, '\n') != EOF) {
276 unsigned char sha1[20];
277 if (buf.len > 0 && buf.buf[0] == '-') {
278 write_or_die(bundle_fd, buf.buf, buf.len);
279 if (!get_sha1_hex(buf.buf + 1, sha1)) {
280 struct object *object = parse_object_or_die(sha1, buf.buf);
281 object->flags |= UNINTERESTING;
282 add_pending_object(&revs, object, buf.buf);
283 }
284 } else if (!get_sha1_hex(buf.buf, sha1)) {
285 struct object *object = parse_object_or_die(sha1, buf.buf);
286 object->flags |= SHOWN;
287 }
288 }
289 strbuf_release(&buf);
290 fclose(rls_fout);
291 if (finish_command(&rls))
292 return error(_("rev-list died"));
293 /* write references */
295 argc = setup_revisions(argc, argv, &revs, NULL);
296 if (argc > 1)
298 return error(_("unrecognized argument: %s"), argv[1]);
299 object_array_remove_duplicates(&revs.pending);
301 for (i = 0; i < revs.pending.nr; i++) {
303 struct object_array_entry *e = revs.pending.objects + i;
304 unsigned char sha1[20];
305 char *ref;
306 const char *display_ref;
307 int flag;
308 if (e->item->flags & UNINTERESTING)
310 continue;
311 if (dwim_ref(e->name, strlen(e->name), sha1, &ref) != 1)
312 continue;
313 if (read_ref_full(e->name, RESOLVE_REF_READING, sha1, &flag))
314 flag = 0;
315 display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
316 if (e->item->type == OBJ_TAG &&
318 !is_tag_in_date_range(e->item, &revs)) {
319 e->item->flags |= UNINTERESTING;
320 continue;
321 }
322 /*
324 * Make sure the refs we wrote out is correct; --max-count and
325 * other limiting options could have prevented all the tips
326 * from getting output.
327 *
328 * Non commit objects such as tags and blobs do not have
329 * this issue as they are not affected by those extra
330 * constraints.
331 */
332 if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
333 warning(_("ref '%s' is excluded by the rev-list options"),
334 e->name);
335 free(ref);
336 continue;
337 }
338 /*
339 * If you run "git bundle create bndl v1.0..v2.0", the
340 * name of the positive ref is "v2.0" but that is the
341 * commit that is referenced by the tag, and not the tag
342 * itself.
343 */
344 if (hashcmp(sha1, e->item->sha1)) {
345 /*
346 * Is this the positive end of a range expressed
347 * in terms of a tag (e.g. v2.0 from the range
348 * "v1.0..v2.0")?
349 */
350 struct commit *one = lookup_commit_reference(sha1);
351 struct object *obj;
352 if (e->item == &(one->object)) {
354 /*
355 * Need to include e->name as an
356 * independent ref to the pack-objects
357 * input, so that the tag is included
358 * in the output; otherwise we would
359 * end up triggering "empty bundle"
360 * error.
361 */
362 obj = parse_object_or_die(sha1, e->name);
363 obj->flags |= SHOWN;
364 add_pending_object(&revs, obj, e->name);
365 }
366 free(ref);
367 continue;
368 }
369 ref_count++;
371 write_or_die(bundle_fd, sha1_to_hex(e->item->sha1), 40);
372 write_or_die(bundle_fd, " ", 1);
373 write_or_die(bundle_fd, display_ref, strlen(display_ref));
374 write_or_die(bundle_fd, "\n", 1);
375 free(ref);
376 }
377 if (!ref_count)
378 die(_("Refusing to create empty bundle."));
379 /* end header */
381 write_or_die(bundle_fd, "\n", 1);
382 /* write pack */
384 memset(&rls, 0, sizeof(rls));
385 argv_array_pushl(&rls.args,
386 "pack-objects", "--all-progress-implied",
387 "--stdout", "--thin", "--delta-base-offset",
388 NULL);
389 rls.in = -1;
390 rls.out = bundle_fd;
391 rls.git_cmd = 1;
392 if (start_command(&rls))
393 return error(_("Could not spawn pack-objects"));
394 /*
396 * start_command closed bundle_fd if it was > 1
397 * so set the lock fd to -1 so commit_lock_file()
398 * won't fail trying to close it.
399 */
400 lock.fd = -1;
401 for (i = 0; i < revs.pending.nr; i++) {
403 struct object *object = revs.pending.objects[i].item;
404 if (object->flags & UNINTERESTING)
405 write_or_die(rls.in, "^", 1);
406 write_or_die(rls.in, sha1_to_hex(object->sha1), 40);
407 write_or_die(rls.in, "\n", 1);
408 }
409 close(rls.in);
410 if (finish_command(&rls))
411 return error(_("pack-objects died"));
412 if (!bundle_to_stdout) {
413 if (commit_lock_file(&lock))
414 die_errno(_("cannot create '%s'"), path);
415 }
416 return 0;
417}
418int unbundle(struct bundle_header *header, int bundle_fd, int flags)
420{
421 const char *argv_index_pack[] = {"index-pack",
422 "--fix-thin", "--stdin", NULL, NULL};
423 struct child_process ip = CHILD_PROCESS_INIT;
424 if (flags & BUNDLE_VERBOSE)
426 argv_index_pack[3] = "-v";
427 if (verify_bundle(header, 0))
429 return -1;
430 ip.argv = argv_index_pack;
431 ip.in = bundle_fd;
432 ip.no_stdout = 1;
433 ip.git_cmd = 1;
434 if (run_command(&ip))
435 return error(_("index-pack died"));
436 return 0;
437}