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"
9static const char bundle_signature[] = "# v2 git bundle\n";
11static void add_to_ref_list(const unsigned char *sha1, const char *name,
13 struct ref_list *list)
14{
15 if (list->nr + 1 >= list->alloc) {
16 list->alloc = alloc_nr(list->nr + 1);
17 list->list = xrealloc(list->list,
18 list->alloc * sizeof(list->list[0]));
19 }
20 memcpy(list->list[list->nr].sha1, sha1, 20);
21 list->list[list->nr].name = xstrdup(name);
22 list->nr++;
23}
24/* returns an fd */
26int read_bundle_header(const char *path, struct bundle_header *header) {
27 char buffer[1024];
28 int fd;
29 long fpos;
30 FILE *ffd = fopen(path, "rb");
31 if (!ffd)
33 return error("could not open '%s'", path);
34 if (!fgets(buffer, sizeof(buffer), ffd) ||
35 strcmp(buffer, bundle_signature)) {
36 fclose(ffd);
37 return error("'%s' does not look like a v2 bundle file", path);
38 }
39 while (fgets(buffer, sizeof(buffer), ffd)
40 && buffer[0] != '\n') {
41 int is_prereq = buffer[0] == '-';
42 int offset = is_prereq ? 1 : 0;
43 int len = strlen(buffer);
44 unsigned char sha1[20];
45 struct ref_list *list = is_prereq ? &header->prerequisites
46 : &header->references;
47 char delim;
48 if (buffer[len - 1] == '\n')
50 buffer[len - 1] = '\0';
51 if (get_sha1_hex(buffer + offset, sha1)) {
52 warning("unrecognized header: %s", buffer);
53 continue;
54 }
55 delim = buffer[40 + offset];
56 if (!isspace(delim) && (delim != '\0' || !is_prereq))
57 die ("invalid header: %s", buffer);
58 add_to_ref_list(sha1, isspace(delim) ?
59 buffer + 41 + offset : "", list);
60 }
61 fpos = ftell(ffd);
62 fclose(ffd);
63 fd = open(path, O_RDONLY);
64 if (fd < 0)
65 return error("could not open '%s'", path);
66 lseek(fd, fpos, SEEK_SET);
67 return fd;
68}
69static int list_refs(struct ref_list *r, int argc, const char **argv)
71{
72 int i;
73 for (i = 0; i < r->nr; i++) {
75 if (argc > 1) {
76 int j;
77 for (j = 1; j < argc; j++)
78 if (!strcmp(r->list[i].name, argv[j]))
79 break;
80 if (j == argc)
81 continue;
82 }
83 printf("%s %s\n", sha1_to_hex(r->list[i].sha1),
84 r->list[i].name);
85 }
86 return 0;
87}
88#define PREREQ_MARK (1u<<16)
90int verify_bundle(struct bundle_header *header, int verbose)
92{
93 /*
94 * Do fast check, then if any prereqs are missing then go line by line
95 * to be verbose about the errors
96 */
97 struct ref_list *p = &header->prerequisites;
98 struct rev_info revs;
99 const char *argv[] = {NULL, "--all"};
100 struct object_array refs;
101 struct commit *commit;
102 int i, ret = 0, req_nr;
103 const char *message = "Repository lacks these prerequisite commits:";
104 init_revisions(&revs, NULL);
106 for (i = 0; i < p->nr; i++) {
107 struct ref_list_entry *e = p->list + i;
108 struct object *o = parse_object(e->sha1);
109 if (o) {
110 o->flags |= PREREQ_MARK;
111 add_pending_object(&revs, o, e->name);
112 continue;
113 }
114 if (++ret == 1)
115 error(message);
116 error("%s %s", sha1_to_hex(e->sha1), e->name);
117 }
118 if (revs.pending.nr != p->nr)
119 return ret;
120 req_nr = revs.pending.nr;
121 setup_revisions(2, argv, &revs, NULL);
122 memset(&refs, 0, sizeof(struct object_array));
124 for (i = 0; i < revs.pending.nr; i++) {
125 struct object_array_entry *e = revs.pending.objects + i;
126 add_object_array(e->item, e->name, &refs);
127 }
128 prepare_revision_walk(&revs);
130 i = req_nr;
132 while (i && (commit = get_revision(&revs)))
133 if (commit->object.flags & PREREQ_MARK)
134 i--;
135 for (i = 0; i < req_nr; i++)
137 if (!(refs.objects[i].item->flags & SHOWN)) {
138 if (++ret == 1)
139 error(message);
140 error("%s %s", sha1_to_hex(refs.objects[i].item->sha1),
141 refs.objects[i].name);
142 }
143 for (i = 0; i < refs.nr; i++)
145 clear_commit_marks((struct commit *)refs.objects[i].item, -1);
146 if (verbose) {
148 struct ref_list *r;
149 r = &header->references;
151 printf("The bundle contains %d ref%s\n",
152 r->nr, (1 < r->nr) ? "s" : "");
153 list_refs(r, 0, NULL);
154 r = &header->prerequisites;
155 printf("The bundle requires these %d ref%s\n",
156 r->nr, (1 < r->nr) ? "s" : "");
157 list_refs(r, 0, NULL);
158 }
159 return ret;
160}
161int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
163{
164 return list_refs(&header->references, argc, argv);
165}
166int create_bundle(struct bundle_header *header, const char *path,
168 int argc, const char **argv)
169{
170 static struct lock_file lock;
171 int bundle_fd = -1;
172 int bundle_to_stdout;
173 const char **argv_boundary = xmalloc((argc + 4) * sizeof(const char *));
174 const char **argv_pack = xmalloc(5 * sizeof(const char *));
175 int i, ref_count = 0;
176 char buffer[1024];
177 struct rev_info revs;
178 struct child_process rls;
179 FILE *rls_fout;
180 bundle_to_stdout = !strcmp(path, "-");
182 if (bundle_to_stdout)
183 bundle_fd = 1;
184 else
185 bundle_fd = hold_lock_file_for_update(&lock, path, 1);
186 /* write signature */
188 write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
189 /* init revs to list objects for pack-objects later */
191 save_commit_buffer = 0;
192 init_revisions(&revs, NULL);
193 /* write prerequisites */
195 memcpy(argv_boundary + 3, argv + 1, argc * sizeof(const char *));
196 argv_boundary[0] = "rev-list";
197 argv_boundary[1] = "--boundary";
198 argv_boundary[2] = "--pretty=oneline";
199 argv_boundary[argc + 2] = NULL;
200 memset(&rls, 0, sizeof(rls));
201 rls.argv = argv_boundary;
202 rls.out = -1;
203 rls.git_cmd = 1;
204 if (start_command(&rls))
205 return -1;
206 rls_fout = fdopen(rls.out, "r");
207 while (fgets(buffer, sizeof(buffer), rls_fout)) {
208 unsigned char sha1[20];
209 if (buffer[0] == '-') {
210 write_or_die(bundle_fd, buffer, strlen(buffer));
211 if (!get_sha1_hex(buffer + 1, sha1)) {
212 struct object *object = parse_object(sha1);
213 object->flags |= UNINTERESTING;
214 add_pending_object(&revs, object, buffer);
215 }
216 } else if (!get_sha1_hex(buffer, sha1)) {
217 struct object *object = parse_object(sha1);
218 object->flags |= SHOWN;
219 }
220 }
221 fclose(rls_fout);
222 if (finish_command(&rls))
223 return error("rev-list died");
224 /* write references */
226 argc = setup_revisions(argc, argv, &revs, NULL);
227 if (argc > 1)
228 return error("unrecognized argument: %s'", argv[1]);
229 for (i = 0; i < revs.pending.nr; i++) {
231 struct object_array_entry *e = revs.pending.objects + i;
232 unsigned char sha1[20];
233 char *ref;
234 if (e->item->flags & UNINTERESTING)
236 continue;
237 if (dwim_ref(e->name, strlen(e->name), sha1, &ref) != 1)
238 continue;
239 /*
240 * Make sure the refs we wrote out is correct; --max-count and
241 * other limiting options could have prevented all the tips
242 * from getting output.
243 *
244 * Non commit objects such as tags and blobs do not have
245 * this issue as they are not affected by those extra
246 * constraints.
247 */
248 if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
249 warning("ref '%s' is excluded by the rev-list options",
250 e->name);
251 free(ref);
252 continue;
253 }
254 /*
255 * If you run "git bundle create bndl v1.0..v2.0", the
256 * name of the positive ref is "v2.0" but that is the
257 * commit that is referenced by the tag, and not the tag
258 * itself.
259 */
260 if (hashcmp(sha1, e->item->sha1)) {
261 /*
262 * Is this the positive end of a range expressed
263 * in terms of a tag (e.g. v2.0 from the range
264 * "v1.0..v2.0")?
265 */
266 struct commit *one = lookup_commit_reference(sha1);
267 struct object *obj;
268 if (e->item == &(one->object)) {
270 /*
271 * Need to include e->name as an
272 * independent ref to the pack-objects
273 * input, so that the tag is included
274 * in the output; otherwise we would
275 * end up triggering "empty bundle"
276 * error.
277 */
278 obj = parse_object(sha1);
279 obj->flags |= SHOWN;
280 add_pending_object(&revs, obj, e->name);
281 }
282 free(ref);
283 continue;
284 }
285 ref_count++;
287 write_or_die(bundle_fd, sha1_to_hex(e->item->sha1), 40);
288 write_or_die(bundle_fd, " ", 1);
289 write_or_die(bundle_fd, ref, strlen(ref));
290 write_or_die(bundle_fd, "\n", 1);
291 free(ref);
292 }
293 if (!ref_count)
294 die ("Refusing to create empty bundle.");
295 /* end header */
297 write_or_die(bundle_fd, "\n", 1);
298 /* write pack */
300 argv_pack[0] = "pack-objects";
301 argv_pack[1] = "--all-progress";
302 argv_pack[2] = "--stdout";
303 argv_pack[3] = "--thin";
304 argv_pack[4] = NULL;
305 memset(&rls, 0, sizeof(rls));
306 rls.argv = argv_pack;
307 rls.in = -1;
308 rls.out = bundle_fd;
309 rls.git_cmd = 1;
310 if (start_command(&rls))
311 return error("Could not spawn pack-objects");
312 for (i = 0; i < revs.pending.nr; i++) {
313 struct object *object = revs.pending.objects[i].item;
314 if (object->flags & UNINTERESTING)
315 write(rls.in, "^", 1);
316 write(rls.in, sha1_to_hex(object->sha1), 40);
317 write(rls.in, "\n", 1);
318 }
319 if (finish_command(&rls))
320 return error ("pack-objects died");
321 close(bundle_fd);
322 if (!bundle_to_stdout)
323 commit_lock_file(&lock);
324 return 0;
325}
326int unbundle(struct bundle_header *header, int bundle_fd)
328{
329 const char *argv_index_pack[] = {"index-pack",
330 "--fix-thin", "--stdin", NULL};
331 struct child_process ip;
332 if (verify_bundle(header, 0))
334 return -1;
335 memset(&ip, 0, sizeof(ip));
336 ip.argv = argv_index_pack;
337 ip.in = bundle_fd;
338 ip.no_stdout = 1;
339 ip.git_cmd = 1;
340 if (run_command(&ip))
341 return error("index-pack died");
342 return 0;
343}