git-send-email: Add --thread option
[git/aroben.git] / builtin-bundle.c
blob306ad29597dbf9002a44ba509c2e9d7a737b159d
1 #include "cache.h"
2 #include "object.h"
3 #include "commit.h"
4 #include "diff.h"
5 #include "revision.h"
6 #include "list-objects.h"
7 #include "run-command.h"
9 /*
10 * Basic handler for bundle files to connect repositories via sneakernet.
11 * Invocation must include action.
12 * This function can create a bundle or provide information on an existing
13 * bundle supporting git-fetch, git-pull, and git-ls-remote
16 static const char *bundle_usage="git-bundle (create <bundle> <git-rev-list args> | verify <bundle> | list-heads <bundle> [refname]... | unbundle <bundle> [refname]... )";
18 static const char bundle_signature[] = "# v2 git bundle\n";
20 struct ref_list {
21 unsigned int nr, alloc;
22 struct ref_list_entry {
23 unsigned char sha1[20];
24 char *name;
25 } *list;
28 static void add_to_ref_list(const unsigned char *sha1, const char *name,
29 struct ref_list *list)
31 if (list->nr + 1 >= list->alloc) {
32 list->alloc = alloc_nr(list->nr + 1);
33 list->list = xrealloc(list->list,
34 list->alloc * sizeof(list->list[0]));
36 memcpy(list->list[list->nr].sha1, sha1, 20);
37 list->list[list->nr].name = xstrdup(name);
38 list->nr++;
41 struct bundle_header {
42 struct ref_list prerequisites;
43 struct ref_list references;
46 /* this function returns the length of the string */
47 static int read_string(int fd, char *buffer, int size)
49 int i;
50 for (i = 0; i < size - 1; i++) {
51 ssize_t count = xread(fd, buffer + i, 1);
52 if (count < 0)
53 return error("Read error: %s", strerror(errno));
54 if (count == 0) {
55 i--;
56 break;
58 if (buffer[i] == '\n')
59 break;
61 buffer[i + 1] = '\0';
62 return i + 1;
65 /* returns an fd */
66 static int read_header(const char *path, struct bundle_header *header) {
67 char buffer[1024];
68 int fd = open(path, O_RDONLY);
70 if (fd < 0)
71 return error("could not open '%s'", path);
72 if (read_string(fd, buffer, sizeof(buffer)) < 0 ||
73 strcmp(buffer, bundle_signature)) {
74 close(fd);
75 return error("'%s' does not look like a v2 bundle file", path);
77 while (read_string(fd, buffer, sizeof(buffer)) > 0
78 && buffer[0] != '\n') {
79 int is_prereq = buffer[0] == '-';
80 int offset = is_prereq ? 1 : 0;
81 int len = strlen(buffer);
82 unsigned char sha1[20];
83 struct ref_list *list = is_prereq ? &header->prerequisites
84 : &header->references;
85 char delim;
87 if (buffer[len - 1] == '\n')
88 buffer[len - 1] = '\0';
89 if (get_sha1_hex(buffer + offset, sha1)) {
90 warning("unrecognized header: %s", buffer);
91 continue;
93 delim = buffer[40 + offset];
94 if (!isspace(delim) && (delim != '\0' || !is_prereq))
95 die ("invalid header: %s", buffer);
96 add_to_ref_list(sha1, isspace(delim) ?
97 buffer + 41 + offset : "", list);
99 return fd;
102 static int list_refs(struct ref_list *r, int argc, const char **argv)
104 int i;
106 for (i = 0; i < r->nr; i++) {
107 if (argc > 1) {
108 int j;
109 for (j = 1; j < argc; j++)
110 if (!strcmp(r->list[i].name, argv[j]))
111 break;
112 if (j == argc)
113 continue;
115 printf("%s %s\n", sha1_to_hex(r->list[i].sha1),
116 r->list[i].name);
118 return 0;
121 #define PREREQ_MARK (1u<<16)
123 static int verify_bundle(struct bundle_header *header, int verbose)
126 * Do fast check, then if any prereqs are missing then go line by line
127 * to be verbose about the errors
129 struct ref_list *p = &header->prerequisites;
130 struct rev_info revs;
131 const char *argv[] = {NULL, "--all"};
132 struct object_array refs;
133 struct commit *commit;
134 int i, ret = 0, req_nr;
135 const char *message = "Repository lacks these prerequisite commits:";
137 init_revisions(&revs, NULL);
138 for (i = 0; i < p->nr; i++) {
139 struct ref_list_entry *e = p->list + i;
140 struct object *o = parse_object(e->sha1);
141 if (o) {
142 o->flags |= PREREQ_MARK;
143 add_pending_object(&revs, o, e->name);
144 continue;
146 if (++ret == 1)
147 error(message);
148 error("%s %s", sha1_to_hex(e->sha1), e->name);
150 if (revs.pending.nr != p->nr)
151 return ret;
152 req_nr = revs.pending.nr;
153 setup_revisions(2, argv, &revs, NULL);
155 memset(&refs, 0, sizeof(struct object_array));
156 for (i = 0; i < revs.pending.nr; i++) {
157 struct object_array_entry *e = revs.pending.objects + i;
158 add_object_array(e->item, e->name, &refs);
161 prepare_revision_walk(&revs);
163 i = req_nr;
164 while (i && (commit = get_revision(&revs)))
165 if (commit->object.flags & PREREQ_MARK)
166 i--;
168 for (i = 0; i < req_nr; i++)
169 if (!(refs.objects[i].item->flags & SHOWN)) {
170 if (++ret == 1)
171 error(message);
172 error("%s %s", sha1_to_hex(refs.objects[i].item->sha1),
173 refs.objects[i].name);
176 for (i = 0; i < refs.nr; i++)
177 clear_commit_marks((struct commit *)refs.objects[i].item, -1);
179 if (verbose) {
180 struct ref_list *r;
182 r = &header->references;
183 printf("The bundle contains %d ref%s\n",
184 r->nr, (1 < r->nr) ? "s" : "");
185 list_refs(r, 0, NULL);
186 r = &header->prerequisites;
187 printf("The bundle requires these %d ref%s\n",
188 r->nr, (1 < r->nr) ? "s" : "");
189 list_refs(r, 0, NULL);
191 return ret;
194 static int list_heads(struct bundle_header *header, int argc, const char **argv)
196 return list_refs(&header->references, argc, argv);
199 static int create_bundle(struct bundle_header *header, const char *path,
200 int argc, const char **argv)
202 int bundle_fd = -1;
203 const char **argv_boundary = xmalloc((argc + 4) * sizeof(const char *));
204 const char **argv_pack = xmalloc(5 * sizeof(const char *));
205 int i, ref_count = 0;
206 char buffer[1024];
207 struct rev_info revs;
208 struct child_process rls;
210 bundle_fd = (!strcmp(path, "-") ? 1 :
211 open(path, O_CREAT | O_EXCL | O_WRONLY, 0666));
212 if (bundle_fd < 0)
213 return error("Could not create '%s': %s", path, strerror(errno));
215 /* write signature */
216 write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
218 /* init revs to list objects for pack-objects later */
219 save_commit_buffer = 0;
220 init_revisions(&revs, NULL);
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 while ((i = read_string(rls.out, buffer, sizeof(buffer))) > 0) {
235 unsigned char sha1[20];
236 if (buffer[0] == '-') {
237 write_or_die(bundle_fd, buffer, i);
238 if (!get_sha1_hex(buffer + 1, sha1)) {
239 struct object *object = parse_object(sha1);
240 object->flags |= UNINTERESTING;
241 add_pending_object(&revs, object, buffer);
243 } else if (!get_sha1_hex(buffer, sha1)) {
244 struct object *object = parse_object(sha1);
245 object->flags |= SHOWN;
248 if (finish_command(&rls))
249 return error("rev-list died");
251 /* write references */
252 argc = setup_revisions(argc, argv, &revs, NULL);
253 if (argc > 1)
254 return error("unrecognized argument: %s'", argv[1]);
256 for (i = 0; i < revs.pending.nr; i++) {
257 struct object_array_entry *e = revs.pending.objects + i;
258 unsigned char sha1[20];
259 char *ref;
261 if (e->item->flags & UNINTERESTING)
262 continue;
263 if (dwim_ref(e->name, strlen(e->name), sha1, &ref) != 1)
264 continue;
266 * Make sure the refs we wrote out is correct; --max-count and
267 * other limiting options could have prevented all the tips
268 * from getting output.
270 if (!(e->item->flags & SHOWN)) {
271 warning("ref '%s' is excluded by the rev-list options",
272 e->name);
273 continue;
275 ref_count++;
276 write_or_die(bundle_fd, sha1_to_hex(e->item->sha1), 40);
277 write_or_die(bundle_fd, " ", 1);
278 write_or_die(bundle_fd, ref, strlen(ref));
279 write_or_die(bundle_fd, "\n", 1);
280 free(ref);
282 if (!ref_count)
283 die ("Refusing to create empty bundle.");
285 /* end header */
286 write_or_die(bundle_fd, "\n", 1);
288 /* write pack */
289 argv_pack[0] = "pack-objects";
290 argv_pack[1] = "--all-progress";
291 argv_pack[2] = "--stdout";
292 argv_pack[3] = "--thin";
293 argv_pack[4] = NULL;
294 memset(&rls, 0, sizeof(rls));
295 rls.argv = argv_pack;
296 rls.in = -1;
297 rls.out = bundle_fd;
298 rls.git_cmd = 1;
299 if (start_command(&rls))
300 return error("Could not spawn pack-objects");
301 for (i = 0; i < revs.pending.nr; i++) {
302 struct object *object = revs.pending.objects[i].item;
303 if (object->flags & UNINTERESTING)
304 write(rls.in, "^", 1);
305 write(rls.in, sha1_to_hex(object->sha1), 40);
306 write(rls.in, "\n", 1);
308 if (finish_command(&rls))
309 return error ("pack-objects died");
310 return 0;
313 static int unbundle(struct bundle_header *header, int bundle_fd,
314 int argc, const char **argv)
316 const char *argv_index_pack[] = {"index-pack",
317 "--fix-thin", "--stdin", NULL};
318 struct child_process ip;
320 if (verify_bundle(header, 0))
321 return -1;
322 memset(&ip, 0, sizeof(ip));
323 ip.argv = argv_index_pack;
324 ip.in = bundle_fd;
325 ip.no_stdout = 1;
326 ip.git_cmd = 1;
327 if (run_command(&ip))
328 return error("index-pack died");
329 return list_heads(header, argc, argv);
332 int cmd_bundle(int argc, const char **argv, const char *prefix)
334 struct bundle_header header;
335 int nongit = 0;
336 const char *cmd, *bundle_file;
337 int bundle_fd = -1;
338 char buffer[PATH_MAX];
340 if (argc < 3)
341 usage(bundle_usage);
343 cmd = argv[1];
344 bundle_file = argv[2];
345 argc -= 2;
346 argv += 2;
348 prefix = setup_git_directory_gently(&nongit);
349 if (prefix && bundle_file[0] != '/') {
350 snprintf(buffer, sizeof(buffer), "%s/%s", prefix, bundle_file);
351 bundle_file = buffer;
354 memset(&header, 0, sizeof(header));
355 if (strcmp(cmd, "create") &&
356 (bundle_fd = read_header(bundle_file, &header)) < 0)
357 return 1;
359 if (!strcmp(cmd, "verify")) {
360 close(bundle_fd);
361 if (verify_bundle(&header, 1))
362 return 1;
363 fprintf(stderr, "%s is okay\n", bundle_file);
364 return 0;
366 if (!strcmp(cmd, "list-heads")) {
367 close(bundle_fd);
368 return !!list_heads(&header, argc, argv);
370 if (!strcmp(cmd, "create")) {
371 if (nongit)
372 die("Need a repository to create a bundle.");
373 return !!create_bundle(&header, bundle_file, argc, argv);
374 } else if (!strcmp(cmd, "unbundle")) {
375 if (nongit)
376 die("Need a repository to unbundle.");
377 return !!unbundle(&header, bundle_fd, argc, argv);
378 } else
379 usage(bundle_usage);