Merge branch 'cb/maint-merge-recursive-fix' into maint
[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"};
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         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
131         if (prepare_revision_walk(&revs))
132                 die("revision walk setup failed");
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)
142                                 error("%s", message);
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
165 int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
166 {
167         return list_refs(&header->references, argc, argv);
168 }
169
170 int 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;
181         int read_from_stdin = 0;
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
189                 bundle_fd = hold_lock_file_for_update(&lock, path,
190                                                       LOCK_DIE_ON_ERROR);
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);
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         }
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;
247                 const char *display_ref;
248                 int flag;
249
250                 if (e->item->flags & UNINTERESTING)
251                         continue;
252                 if (dwim_ref(e->name, strlen(e->name), sha1, &ref) != 1)
253                         continue;
254                 if (!resolve_ref(e->name, sha1, 1, &flag))
255                         flag = 0;
256                 display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
257
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);
308                 write_or_die(bundle_fd, display_ref, strlen(display_ref));
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");
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
339         for (i = 0; i < revs.pending.nr; i++) {
340                 struct object *object = revs.pending.objects[i].item;
341                 if (object->flags & UNINTERESTING)
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);
345         }
346         close(rls.in);
347         if (finish_command(&rls))
348                 return error ("pack-objects died");
349         if (!bundle_to_stdout)
350                 commit_lock_file(&lock);
351         return 0;
352 }
353
354 int 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 }