Code

commit-tree: teach -m/-F options to read logs from elsewhere
[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"
11 static const char bundle_signature[] = "# v2 git bundle\n";
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 }
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");
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;
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 }
72 static int list_refs(struct ref_list *r, int argc, const char **argv)
73 {
74         int i;
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 }
91 #define PREREQ_MARK (1u<<16)
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:";
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);
125         refs = revs.pending;
126         revs.leak_pending = 1;
128         if (prepare_revision_walk(&revs))
129                 die("revision walk setup failed");
131         i = req_nr;
132         while (i && (commit = get_revision(&revs)))
133                 if (commit->object.flags & PREREQ_MARK)
134                         i--;
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                 }
144         clear_commit_marks_for_object_array(&refs, ALL_REV_FLAGS);
145         free(refs.objects);
147         if (verbose) {
148                 struct ref_list *r;
150                 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;
162 int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
164         return list_refs(&header->references, argc, argv);
167 static int is_tag_in_date_range(struct object *tag, struct rev_info *revs)
169         unsigned long size;
170         enum object_type type;
171         char *buf, *line, *lineend;
172         unsigned long date;
174         if (revs->max_age == -1 && revs->min_age == -1)
175                 return 1;
177         buf = read_sha1_file(tag->sha1, &type, &size);
178         if (!buf)
179                 return 1;
180         line = memmem(buf, size, "\ntagger ", 8);
181         if (!line++)
182                 return 1;
183         lineend = memchr(line, buf + size - line, '\n');
184         line = memchr(line, lineend ? lineend - line : buf + size - line, '>');
185         if (!line++)
186                 return 1;
187         date = strtoul(line, NULL, 10);
188         free(buf);
189         return (revs->max_age == -1 || revs->max_age < date) &&
190                 (revs->min_age == -1 || revs->min_age > date);
193 int create_bundle(struct bundle_header *header, const char *path,
194                 int argc, const char **argv)
196         static struct lock_file lock;
197         int bundle_fd = -1;
198         int bundle_to_stdout;
199         const char **argv_boundary = xmalloc((argc + 4) * sizeof(const char *));
200         const char **argv_pack = xmalloc(6 * sizeof(const char *));
201         int i, ref_count = 0;
202         char buffer[1024];
203         struct rev_info revs;
204         struct child_process rls;
205         FILE *rls_fout;
207         bundle_to_stdout = !strcmp(path, "-");
208         if (bundle_to_stdout)
209                 bundle_fd = 1;
210         else
211                 bundle_fd = hold_lock_file_for_update(&lock, path,
212                                                       LOCK_DIE_ON_ERROR);
214         /* write signature */
215         write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
217         /* init revs to list objects for pack-objects later */
218         save_commit_buffer = 0;
219         init_revisions(&revs, NULL);
221         /* write prerequisites */
222         memcpy(argv_boundary + 3, argv + 1, argc * sizeof(const char *));
223         argv_boundary[0] = "rev-list";
224         argv_boundary[1] = "--boundary";
225         argv_boundary[2] = "--pretty=oneline";
226         argv_boundary[argc + 2] = NULL;
227         memset(&rls, 0, sizeof(rls));
228         rls.argv = argv_boundary;
229         rls.out = -1;
230         rls.git_cmd = 1;
231         if (start_command(&rls))
232                 return -1;
233         rls_fout = xfdopen(rls.out, "r");
234         while (fgets(buffer, sizeof(buffer), rls_fout)) {
235                 unsigned char sha1[20];
236                 if (buffer[0] == '-') {
237                         write_or_die(bundle_fd, buffer, strlen(buffer));
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);
242                         }
243                 } else if (!get_sha1_hex(buffer, sha1)) {
244                         struct object *object = parse_object(sha1);
245                         object->flags |= SHOWN;
246                 }
247         }
248         fclose(rls_fout);
249         if (finish_command(&rls))
250                 return error("rev-list died");
252         /* write references */
253         argc = setup_revisions(argc, argv, &revs, NULL);
255         if (argc > 1)
256                 return error("unrecognized argument: %s'", argv[1]);
258         object_array_remove_duplicates(&revs.pending);
260         for (i = 0; i < revs.pending.nr; i++) {
261                 struct object_array_entry *e = revs.pending.objects + i;
262                 unsigned char sha1[20];
263                 char *ref;
264                 const char *display_ref;
265                 int flag;
267                 if (e->item->flags & UNINTERESTING)
268                         continue;
269                 if (dwim_ref(e->name, strlen(e->name), sha1, &ref) != 1)
270                         continue;
271                 if (!resolve_ref(e->name, sha1, 1, &flag))
272                         flag = 0;
273                 display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
275                 if (e->item->type == OBJ_TAG &&
276                                 !is_tag_in_date_range(e->item, &revs)) {
277                         e->item->flags |= UNINTERESTING;
278                         continue;
279                 }
281                 /*
282                  * Make sure the refs we wrote out is correct; --max-count and
283                  * other limiting options could have prevented all the tips
284                  * from getting output.
285                  *
286                  * Non commit objects such as tags and blobs do not have
287                  * this issue as they are not affected by those extra
288                  * constraints.
289                  */
290                 if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
291                         warning("ref '%s' is excluded by the rev-list options",
292                                 e->name);
293                         free(ref);
294                         continue;
295                 }
296                 /*
297                  * If you run "git bundle create bndl v1.0..v2.0", the
298                  * name of the positive ref is "v2.0" but that is the
299                  * commit that is referenced by the tag, and not the tag
300                  * itself.
301                  */
302                 if (hashcmp(sha1, e->item->sha1)) {
303                         /*
304                          * Is this the positive end of a range expressed
305                          * in terms of a tag (e.g. v2.0 from the range
306                          * "v1.0..v2.0")?
307                          */
308                         struct commit *one = lookup_commit_reference(sha1);
309                         struct object *obj;
311                         if (e->item == &(one->object)) {
312                                 /*
313                                  * Need to include e->name as an
314                                  * independent ref to the pack-objects
315                                  * input, so that the tag is included
316                                  * in the output; otherwise we would
317                                  * end up triggering "empty bundle"
318                                  * error.
319                                  */
320                                 obj = parse_object(sha1);
321                                 obj->flags |= SHOWN;
322                                 add_pending_object(&revs, obj, e->name);
323                         }
324                         free(ref);
325                         continue;
326                 }
328                 ref_count++;
329                 write_or_die(bundle_fd, sha1_to_hex(e->item->sha1), 40);
330                 write_or_die(bundle_fd, " ", 1);
331                 write_or_die(bundle_fd, display_ref, strlen(display_ref));
332                 write_or_die(bundle_fd, "\n", 1);
333                 free(ref);
334         }
335         if (!ref_count)
336                 die ("Refusing to create empty bundle.");
338         /* end header */
339         write_or_die(bundle_fd, "\n", 1);
341         /* write pack */
342         argv_pack[0] = "pack-objects";
343         argv_pack[1] = "--all-progress-implied";
344         argv_pack[2] = "--stdout";
345         argv_pack[3] = "--thin";
346         argv_pack[4] = "--delta-base-offset";
347         argv_pack[5] = NULL;
348         memset(&rls, 0, sizeof(rls));
349         rls.argv = argv_pack;
350         rls.in = -1;
351         rls.out = bundle_fd;
352         rls.git_cmd = 1;
353         if (start_command(&rls))
354                 return error("Could not spawn pack-objects");
356         /*
357          * start_command closed bundle_fd if it was > 1
358          * so set the lock fd to -1 so commit_lock_file()
359          * won't fail trying to close it.
360          */
361         lock.fd = -1;
363         for (i = 0; i < revs.pending.nr; i++) {
364                 struct object *object = revs.pending.objects[i].item;
365                 if (object->flags & UNINTERESTING)
366                         write_or_die(rls.in, "^", 1);
367                 write_or_die(rls.in, sha1_to_hex(object->sha1), 40);
368                 write_or_die(rls.in, "\n", 1);
369         }
370         close(rls.in);
371         if (finish_command(&rls))
372                 return error ("pack-objects died");
373         if (!bundle_to_stdout) {
374                 if (commit_lock_file(&lock))
375                         die_errno("cannot create '%s'", path);
376         }
377         return 0;
380 int unbundle(struct bundle_header *header, int bundle_fd, int flags)
382         const char *argv_index_pack[] = {"index-pack",
383                                          "--fix-thin", "--stdin", NULL, NULL};
384         struct child_process ip;
386         if (flags & BUNDLE_VERBOSE)
387                 argv_index_pack[3] = "-v";
389         if (verify_bundle(header, 0))
390                 return -1;
391         memset(&ip, 0, sizeof(ip));
392         ip.argv = argv_index_pack;
393         ip.in = bundle_fd;
394         ip.no_stdout = 1;
395         ip.git_cmd = 1;
396         if (run_command(&ip))
397                 return error("index-pack died");
398         return 0;