doc/git-fsck: change the way for getting heads' SHA1s
[git/git.git] / bundle.c
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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"
fa303836 9#include "refs.h"
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10
11static const char bundle_signature[] = "# v2 git bundle\n";
12
13static 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 */
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27int read_bundle_header(const char *path, struct bundle_header *header)
28{
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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
872c930d 51 if (len && buffer[len - 1] == '\n')
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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
72static 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
93int 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"};
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)
9db56f71 117 error("%s", message);
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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 memset(&refs, 0, sizeof(struct object_array));
126 for (i = 0; i < revs.pending.nr; i++) {
127 struct object_array_entry *e = revs.pending.objects + i;
128 add_object_array(e->item, e->name, &refs);
129 }
130
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131 if (prepare_revision_walk(&revs))
132 die("revision walk setup failed");
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133
134 i = req_nr;
135 while (i && (commit = get_revision(&revs)))
136 if (commit->object.flags & PREREQ_MARK)
137 i--;
138
139 for (i = 0; i < req_nr; i++)
140 if (!(refs.objects[i].item->flags & SHOWN)) {
141 if (++ret == 1)
9db56f71 142 error("%s", message);
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143 error("%s %s", sha1_to_hex(refs.objects[i].item->sha1),
144 refs.objects[i].name);
145 }
146
147 for (i = 0; i < refs.nr; i++)
148 clear_commit_marks((struct commit *)refs.objects[i].item, -1);
149
150 if (verbose) {
151 struct ref_list *r;
152
153 r = &header->references;
154 printf("The bundle contains %d ref%s\n",
155 r->nr, (1 < r->nr) ? "s" : "");
156 list_refs(r, 0, NULL);
157 r = &header->prerequisites;
158 printf("The bundle requires these %d ref%s\n",
159 r->nr, (1 < r->nr) ? "s" : "");
160 list_refs(r, 0, NULL);
161 }
162 return ret;
163}
164
165int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
166{
167 return list_refs(&header->references, argc, argv);
168}
169
170int create_bundle(struct bundle_header *header, const char *path,
171 int argc, const char **argv)
172{
173 static struct lock_file lock;
174 int bundle_fd = -1;
175 int bundle_to_stdout;
176 const char **argv_boundary = xmalloc((argc + 4) * sizeof(const char *));
177 const char **argv_pack = xmalloc(5 * sizeof(const char *));
178 int i, ref_count = 0;
179 char buffer[1024];
180 struct rev_info revs;
22568f0a 181 int read_from_stdin = 0;
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182 struct child_process rls;
183 FILE *rls_fout;
184
185 bundle_to_stdout = !strcmp(path, "-");
186 if (bundle_to_stdout)
187 bundle_fd = 1;
188 else
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189 bundle_fd = hold_lock_file_for_update(&lock, path,
190 LOCK_DIE_ON_ERROR);
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191
192 /* write signature */
193 write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
194
195 /* init revs to list objects for pack-objects later */
196 save_commit_buffer = 0;
197 init_revisions(&revs, NULL);
198
199 /* write prerequisites */
200 memcpy(argv_boundary + 3, argv + 1, argc * sizeof(const char *));
201 argv_boundary[0] = "rev-list";
202 argv_boundary[1] = "--boundary";
203 argv_boundary[2] = "--pretty=oneline";
204 argv_boundary[argc + 2] = NULL;
205 memset(&rls, 0, sizeof(rls));
206 rls.argv = argv_boundary;
207 rls.out = -1;
208 rls.git_cmd = 1;
209 if (start_command(&rls))
210 return -1;
211 rls_fout = fdopen(rls.out, "r");
212 while (fgets(buffer, sizeof(buffer), rls_fout)) {
213 unsigned char sha1[20];
214 if (buffer[0] == '-') {
215 write_or_die(bundle_fd, buffer, strlen(buffer));
216 if (!get_sha1_hex(buffer + 1, sha1)) {
217 struct object *object = parse_object(sha1);
218 object->flags |= UNINTERESTING;
219 add_pending_object(&revs, object, buffer);
220 }
221 } else if (!get_sha1_hex(buffer, sha1)) {
222 struct object *object = parse_object(sha1);
223 object->flags |= SHOWN;
224 }
225 }
226 fclose(rls_fout);
227 if (finish_command(&rls))
228 return error("rev-list died");
229
230 /* write references */
231 argc = setup_revisions(argc, argv, &revs, NULL);
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232
233 for (i = 1; i < argc; i++) {
234 if (!strcmp(argv[i], "--stdin")) {
235 if (read_from_stdin++)
236 die("--stdin given twice?");
237 read_revisions_from_stdin(&revs);
238 continue;
239 }
240 return error("unrecognized argument: %s'", argv[i]);
241 }
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242
243 for (i = 0; i < revs.pending.nr; i++) {
244 struct object_array_entry *e = revs.pending.objects + i;
245 unsigned char sha1[20];
246 char *ref;
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247 const char *display_ref;
248 int flag;
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249
250 if (e->item->flags & UNINTERESTING)
251 continue;
252 if (dwim_ref(e->name, strlen(e->name), sha1, &ref) != 1)
253 continue;
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254 if (!resolve_ref(e->name, sha1, 1, &flag))
255 flag = 0;
256 display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
257
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258 /*
259 * Make sure the refs we wrote out is correct; --max-count and
260 * other limiting options could have prevented all the tips
261 * from getting output.
262 *
263 * Non commit objects such as tags and blobs do not have
264 * this issue as they are not affected by those extra
265 * constraints.
266 */
267 if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
268 warning("ref '%s' is excluded by the rev-list options",
269 e->name);
270 free(ref);
271 continue;
272 }
273 /*
274 * If you run "git bundle create bndl v1.0..v2.0", the
275 * name of the positive ref is "v2.0" but that is the
276 * commit that is referenced by the tag, and not the tag
277 * itself.
278 */
279 if (hashcmp(sha1, e->item->sha1)) {
280 /*
281 * Is this the positive end of a range expressed
282 * in terms of a tag (e.g. v2.0 from the range
283 * "v1.0..v2.0")?
284 */
285 struct commit *one = lookup_commit_reference(sha1);
286 struct object *obj;
287
288 if (e->item == &(one->object)) {
289 /*
290 * Need to include e->name as an
291 * independent ref to the pack-objects
292 * input, so that the tag is included
293 * in the output; otherwise we would
294 * end up triggering "empty bundle"
295 * error.
296 */
297 obj = parse_object(sha1);
298 obj->flags |= SHOWN;
299 add_pending_object(&revs, obj, e->name);
300 }
301 free(ref);
302 continue;
303 }
304
305 ref_count++;
306 write_or_die(bundle_fd, sha1_to_hex(e->item->sha1), 40);
307 write_or_die(bundle_fd, " ", 1);
fa303836 308 write_or_die(bundle_fd, display_ref, strlen(display_ref));
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309 write_or_die(bundle_fd, "\n", 1);
310 free(ref);
311 }
312 if (!ref_count)
313 die ("Refusing to create empty bundle.");
314
315 /* end header */
316 write_or_die(bundle_fd, "\n", 1);
317
318 /* write pack */
319 argv_pack[0] = "pack-objects";
320 argv_pack[1] = "--all-progress";
321 argv_pack[2] = "--stdout";
322 argv_pack[3] = "--thin";
323 argv_pack[4] = NULL;
324 memset(&rls, 0, sizeof(rls));
325 rls.argv = argv_pack;
326 rls.in = -1;
327 rls.out = bundle_fd;
328 rls.git_cmd = 1;
329 if (start_command(&rls))
330 return error("Could not spawn pack-objects");
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331
332 /*
333 * start_command closed bundle_fd if it was > 1
334 * so set the lock fd to -1 so commit_lock_file()
335 * won't fail trying to close it.
336 */
337 lock.fd = -1;
338
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339 for (i = 0; i < revs.pending.nr; i++) {
340 struct object *object = revs.pending.objects[i].item;
341 if (object->flags & UNINTERESTING)
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342 write_or_die(rls.in, "^", 1);
343 write_or_die(rls.in, sha1_to_hex(object->sha1), 40);
344 write_or_die(rls.in, "\n", 1);
30415d50 345 }
e72ae288 346 close(rls.in);
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347 if (finish_command(&rls))
348 return error ("pack-objects died");
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349 if (!bundle_to_stdout)
350 commit_lock_file(&lock);
351 return 0;
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352}
353
354int unbundle(struct bundle_header *header, int bundle_fd)
355{
356 const char *argv_index_pack[] = {"index-pack",
357 "--fix-thin", "--stdin", NULL};
358 struct child_process ip;
359
360 if (verify_bundle(header, 0))
361 return -1;
362 memset(&ip, 0, sizeof(ip));
363 ip.argv = argv_index_pack;
364 ip.in = bundle_fd;
365 ip.no_stdout = 1;
366 ip.git_cmd = 1;
367 if (run_command(&ip))
368 return error("index-pack died");
369 return 0;
370}