bundle: use leak_pending flag
[git/git.git] / bundle.c
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
11 static const char bundle_signature[] = "# v2 git bundle\n";
12
13 static 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 }
25
26 /* returns an fd */
27 int read_bundle_header(const char *path, struct bundle_header *header)
28 {
29 char buffer[1024];
30 int fd;
31 long fpos;
32 FILE *ffd = fopen(path, "rb");
33
34 if (!ffd)
35 return error("could not open '%s'", path);
36 if (!fgets(buffer, sizeof(buffer), ffd) ||
37 strcmp(buffer, bundle_signature)) {
38 fclose(ffd);
39 return error("'%s' does not look like a v2 bundle file", path);
40 }
41 while (fgets(buffer, sizeof(buffer), ffd)
42 && buffer[0] != '\n') {
43 int is_prereq = buffer[0] == '-';
44 int offset = is_prereq ? 1 : 0;
45 int len = strlen(buffer);
46 unsigned char sha1[20];
47 struct ref_list *list = is_prereq ? &header->prerequisites
48 : &header->references;
49 char delim;
50
51 if (len && buffer[len - 1] == '\n')
52 buffer[len - 1] = '\0';
53 if (get_sha1_hex(buffer + offset, sha1)) {
54 warning("unrecognized header: %s", buffer);
55 continue;
56 }
57 delim = buffer[40 + offset];
58 if (!isspace(delim) && (delim != '\0' || !is_prereq))
59 die ("invalid header: %s", buffer);
60 add_to_ref_list(sha1, isspace(delim) ?
61 buffer + 41 + offset : "", list);
62 }
63 fpos = ftell(ffd);
64 fclose(ffd);
65 fd = open(path, O_RDONLY);
66 if (fd < 0)
67 return error("could not open '%s'", path);
68 lseek(fd, fpos, SEEK_SET);
69 return fd;
70 }
71
72 static int list_refs(struct ref_list *r, int argc, const char **argv)
73 {
74 int i;
75
76 for (i = 0; i < r->nr; i++) {
77 if (argc > 1) {
78 int j;
79 for (j = 1; j < argc; j++)
80 if (!strcmp(r->list[i].name, argv[j]))
81 break;
82 if (j == argc)
83 continue;
84 }
85 printf("%s %s\n", sha1_to_hex(r->list[i].sha1),
86 r->list[i].name);
87 }
88 return 0;
89 }
90
91 #define PREREQ_MARK (1u<<16)
92
93 int verify_bundle(struct bundle_header *header, int verbose)
94 {
95 /*
96 * Do fast check, then if any prereqs are missing then go line by line
97 * to be verbose about the errors
98 */
99 struct ref_list *p = &header->prerequisites;
100 struct rev_info revs;
101 const char *argv[] = {NULL, "--all", NULL};
102 struct object_array refs;
103 struct commit *commit;
104 int i, ret = 0, req_nr;
105 const char *message = "Repository lacks these prerequisite commits:";
106
107 init_revisions(&revs, NULL);
108 for (i = 0; i < p->nr; i++) {
109 struct ref_list_entry *e = p->list + i;
110 struct object *o = parse_object(e->sha1);
111 if (o) {
112 o->flags |= PREREQ_MARK;
113 add_pending_object(&revs, o, e->name);
114 continue;
115 }
116 if (++ret == 1)
117 error("%s", message);
118 error("%s %s", sha1_to_hex(e->sha1), e->name);
119 }
120 if (revs.pending.nr != p->nr)
121 return ret;
122 req_nr = revs.pending.nr;
123 setup_revisions(2, argv, &revs, NULL);
124
125 refs = revs.pending;
126 revs.leak_pending = 1;
127
128 if (prepare_revision_walk(&revs))
129 die("revision walk setup failed");
130
131 i = req_nr;
132 while (i && (commit = get_revision(&revs)))
133 if (commit->object.flags & PREREQ_MARK)
134 i--;
135
136 for (i = 0; i < req_nr; i++)
137 if (!(refs.objects[i].item->flags & SHOWN)) {
138 if (++ret == 1)
139 error("%s", message);
140 error("%s %s", sha1_to_hex(refs.objects[i].item->sha1),
141 refs.objects[i].name);
142 }
143
144 for (i = 0; i < refs.nr; i++)
145 clear_commit_marks((struct commit *)refs.objects[i].item, -1);
146 free(refs.objects);
147
148 if (verbose) {
149 struct ref_list *r;
150
151 r = &header->references;
152 printf("The bundle contains %d ref%s\n",
153 r->nr, (1 < r->nr) ? "s" : "");
154 list_refs(r, 0, NULL);
155 r = &header->prerequisites;
156 printf("The bundle requires these %d ref%s\n",
157 r->nr, (1 < r->nr) ? "s" : "");
158 list_refs(r, 0, NULL);
159 }
160 return ret;
161 }
162
163 int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
164 {
165 return list_refs(&header->references, argc, argv);
166 }
167
168 static int is_tag_in_date_range(struct object *tag, struct rev_info *revs)
169 {
170 unsigned long size;
171 enum object_type type;
172 char *buf, *line, *lineend;
173 unsigned long date;
174
175 if (revs->max_age == -1 && revs->min_age == -1)
176 return 1;
177
178 buf = read_sha1_file(tag->sha1, &type, &size);
179 if (!buf)
180 return 1;
181 line = memmem(buf, size, "\ntagger ", 8);
182 if (!line++)
183 return 1;
184 lineend = memchr(line, buf + size - line, '\n');
185 line = memchr(line, lineend ? lineend - line : buf + size - line, '>');
186 if (!line++)
187 return 1;
188 date = strtoul(line, NULL, 10);
189 free(buf);
190 return (revs->max_age == -1 || revs->max_age < date) &&
191 (revs->min_age == -1 || revs->min_age > date);
192 }
193
194 int create_bundle(struct bundle_header *header, const char *path,
195 int argc, const char **argv)
196 {
197 static struct lock_file lock;
198 int bundle_fd = -1;
199 int bundle_to_stdout;
200 const char **argv_boundary = xmalloc((argc + 4) * sizeof(const char *));
201 const char **argv_pack = xmalloc(6 * sizeof(const char *));
202 int i, ref_count = 0;
203 char buffer[1024];
204 struct rev_info revs;
205 struct child_process rls;
206 FILE *rls_fout;
207
208 bundle_to_stdout = !strcmp(path, "-");
209 if (bundle_to_stdout)
210 bundle_fd = 1;
211 else
212 bundle_fd = hold_lock_file_for_update(&lock, path,
213 LOCK_DIE_ON_ERROR);
214
215 /* write signature */
216 write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
217
218 /* init revs to list objects for pack-objects later */
219 save_commit_buffer = 0;
220 init_revisions(&revs, NULL);
221
222 /* write prerequisites */
223 memcpy(argv_boundary + 3, argv + 1, argc * sizeof(const char *));
224 argv_boundary[0] = "rev-list";
225 argv_boundary[1] = "--boundary";
226 argv_boundary[2] = "--pretty=oneline";
227 argv_boundary[argc + 2] = NULL;
228 memset(&rls, 0, sizeof(rls));
229 rls.argv = argv_boundary;
230 rls.out = -1;
231 rls.git_cmd = 1;
232 if (start_command(&rls))
233 return -1;
234 rls_fout = xfdopen(rls.out, "r");
235 while (fgets(buffer, sizeof(buffer), rls_fout)) {
236 unsigned char sha1[20];
237 if (buffer[0] == '-') {
238 write_or_die(bundle_fd, buffer, strlen(buffer));
239 if (!get_sha1_hex(buffer + 1, sha1)) {
240 struct object *object = parse_object(sha1);
241 object->flags |= UNINTERESTING;
242 add_pending_object(&revs, object, buffer);
243 }
244 } else if (!get_sha1_hex(buffer, sha1)) {
245 struct object *object = parse_object(sha1);
246 object->flags |= SHOWN;
247 }
248 }
249 fclose(rls_fout);
250 if (finish_command(&rls))
251 return error("rev-list died");
252
253 /* write references */
254 argc = setup_revisions(argc, argv, &revs, NULL);
255
256 if (argc > 1)
257 return error("unrecognized argument: %s'", argv[1]);
258
259 object_array_remove_duplicates(&revs.pending);
260
261 for (i = 0; i < revs.pending.nr; i++) {
262 struct object_array_entry *e = revs.pending.objects + i;
263 unsigned char sha1[20];
264 char *ref;
265 const char *display_ref;
266 int flag;
267
268 if (e->item->flags & UNINTERESTING)
269 continue;
270 if (dwim_ref(e->name, strlen(e->name), sha1, &ref) != 1)
271 continue;
272 if (!resolve_ref(e->name, sha1, 1, &flag))
273 flag = 0;
274 display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
275
276 if (e->item->type == OBJ_TAG &&
277 !is_tag_in_date_range(e->item, &revs)) {
278 e->item->flags |= UNINTERESTING;
279 continue;
280 }
281
282 /*
283 * Make sure the refs we wrote out is correct; --max-count and
284 * other limiting options could have prevented all the tips
285 * from getting output.
286 *
287 * Non commit objects such as tags and blobs do not have
288 * this issue as they are not affected by those extra
289 * constraints.
290 */
291 if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
292 warning("ref '%s' is excluded by the rev-list options",
293 e->name);
294 free(ref);
295 continue;
296 }
297 /*
298 * If you run "git bundle create bndl v1.0..v2.0", the
299 * name of the positive ref is "v2.0" but that is the
300 * commit that is referenced by the tag, and not the tag
301 * itself.
302 */
303 if (hashcmp(sha1, e->item->sha1)) {
304 /*
305 * Is this the positive end of a range expressed
306 * in terms of a tag (e.g. v2.0 from the range
307 * "v1.0..v2.0")?
308 */
309 struct commit *one = lookup_commit_reference(sha1);
310 struct object *obj;
311
312 if (e->item == &(one->object)) {
313 /*
314 * Need to include e->name as an
315 * independent ref to the pack-objects
316 * input, so that the tag is included
317 * in the output; otherwise we would
318 * end up triggering "empty bundle"
319 * error.
320 */
321 obj = parse_object(sha1);
322 obj->flags |= SHOWN;
323 add_pending_object(&revs, obj, e->name);
324 }
325 free(ref);
326 continue;
327 }
328
329 ref_count++;
330 write_or_die(bundle_fd, sha1_to_hex(e->item->sha1), 40);
331 write_or_die(bundle_fd, " ", 1);
332 write_or_die(bundle_fd, display_ref, strlen(display_ref));
333 write_or_die(bundle_fd, "\n", 1);
334 free(ref);
335 }
336 if (!ref_count)
337 die ("Refusing to create empty bundle.");
338
339 /* end header */
340 write_or_die(bundle_fd, "\n", 1);
341
342 /* write pack */
343 argv_pack[0] = "pack-objects";
344 argv_pack[1] = "--all-progress-implied";
345 argv_pack[2] = "--stdout";
346 argv_pack[3] = "--thin";
347 argv_pack[4] = "--delta-base-offset";
348 argv_pack[5] = NULL;
349 memset(&rls, 0, sizeof(rls));
350 rls.argv = argv_pack;
351 rls.in = -1;
352 rls.out = bundle_fd;
353 rls.git_cmd = 1;
354 if (start_command(&rls))
355 return error("Could not spawn pack-objects");
356
357 /*
358 * start_command closed bundle_fd if it was > 1
359 * so set the lock fd to -1 so commit_lock_file()
360 * won't fail trying to close it.
361 */
362 lock.fd = -1;
363
364 for (i = 0; i < revs.pending.nr; i++) {
365 struct object *object = revs.pending.objects[i].item;
366 if (object->flags & UNINTERESTING)
367 write_or_die(rls.in, "^", 1);
368 write_or_die(rls.in, sha1_to_hex(object->sha1), 40);
369 write_or_die(rls.in, "\n", 1);
370 }
371 close(rls.in);
372 if (finish_command(&rls))
373 return error ("pack-objects died");
374 if (!bundle_to_stdout) {
375 if (commit_lock_file(&lock))
376 die_errno("cannot create '%s'", path);
377 }
378 return 0;
379 }
380
381 int unbundle(struct bundle_header *header, int bundle_fd)
382 {
383 const char *argv_index_pack[] = {"index-pack",
384 "--fix-thin", "--stdin", NULL};
385 struct child_process ip;
386
387 if (verify_bundle(header, 0))
388 return -1;
389 memset(&ip, 0, sizeof(ip));
390 ip.argv = argv_index_pack;
391 ip.in = bundle_fd;
392 ip.no_stdout = 1;
393 ip.git_cmd = 1;
394 if (run_command(&ip))
395 return error("index-pack died");
396 return 0;
397 }