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
  10 static const char bundle_signature[] = "# v2 git bundle\n";
  11
  12 static 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
  25 /* returns an fd */
  26 int read_bundle_header(const char *path, struct bundle_header *header)
  27 {
  28         char buffer[1024];
  29         int fd;
  30         long fpos;
  31         FILE *ffd = fopen(path, "rb");
  32
  33         if (!ffd)
  34                 return error("could not open '%s'", path);
  35         if (!fgets(buffer, sizeof(buffer), ffd) ||
  36                         strcmp(buffer, bundle_signature)) {
  37                 fclose(ffd);
  38                 return error("'%s' does not look like a v2 bundle file", path);
  39         }
  40         while (fgets(buffer, sizeof(buffer), ffd)
  41                         && buffer[0] != '\n') {
  42                 int is_prereq = buffer[0] == '-';
  43                 int offset = is_prereq ? 1 : 0;
  44                 int len = strlen(buffer);
  45                 unsigned char sha1[20];
  46                 struct ref_list *list = is_prereq ? &header->prerequisites
  47                         : &header->references;
  48                 char delim;
  49
  50                 if (buffer[len - 1] == '\n')
  51                         buffer[len - 1] = '\0';
  52                 if (get_sha1_hex(buffer + offset, sha1)) {
  53                         warning("unrecognized header: %s", buffer);
  54                         continue;
  55                 }
  56                 delim = buffer[40 + offset];
  57                 if (!isspace(delim) && (delim != '\0' || !is_prereq))
  58                         die ("invalid header: %s", buffer);
  59                 add_to_ref_list(sha1, isspace(delim) ?
  60                                 buffer + 41 + offset : "", list);
  61         }
  62         fpos = ftell(ffd);
  63         fclose(ffd);
  64         fd = open(path, O_RDONLY);
  65         if (fd < 0)
  66                 return error("could not open '%s'", path);
  67         lseek(fd, fpos, SEEK_SET);
  68         return fd;
  69 }
  70
  71 static int list_refs(struct ref_list *r, int argc, const char **argv)
  72 {
  73         int i;
  74
  75         for (i = 0; i < r->nr; i++) {
  76                 if (argc > 1) {
  77                         int j;
  78                         for (j = 1; j < argc; j++)
  79                                 if (!strcmp(r->list[i].name, argv[j]))
  80                                         break;
  81                         if (j == argc)
  82                                 continue;
  83                 }
  84                 printf("%s %s\n", sha1_to_hex(r->list[i].sha1),
  85                                 r->list[i].name);
  86         }
  87         return 0;
  88 }
  89
  90 #define PREREQ_MARK (1u<<16)
  91
  92 int verify_bundle(struct bundle_header *header, int verbose)
  93 {
  94         /*
  95          * Do fast check, then if any prereqs are missing then go line by line
  96          * to be verbose about the errors
  97          */
  98         struct ref_list *p = &header->prerequisites;
  99         struct rev_info revs;
 100         const char *argv[] = {NULL, "--all"};
 101         struct object_array refs;
 102         struct commit *commit;
 103         int i, ret = 0, req_nr;
 104         const char *message = "Repository lacks these prerequisite commits:";
 105
 106         init_revisions(&revs, NULL);
 107         for (i = 0; i < p->nr; i++) {
 108                 struct ref_list_entry *e = p->list + i;
 109                 struct object *o = parse_object(e->sha1);
 110                 if (o) {
 111                         o->flags |= PREREQ_MARK;
 112                         add_pending_object(&revs, o, e->name);
 113                         continue;
 114                 }
 115                 if (++ret == 1)
 116                         error(message);
 117                 error("%s %s", sha1_to_hex(e->sha1), e->name);
 118         }
 119         if (revs.pending.nr != p->nr)
 120                 return ret;
 121         req_nr = revs.pending.nr;
 122         setup_revisions(2, argv, &revs, NULL);
 123
 124         memset(&refs, 0, sizeof(struct object_array));
 125         for (i = 0; i < revs.pending.nr; i++) {
 126                 struct object_array_entry *e = revs.pending.objects + i;
 127                 add_object_array(e->item, e->name, &refs);
 128         }
 129
 130         prepare_revision_walk(&revs);
 131
 132         i = req_nr;
 133         while (i && (commit = get_revision(&revs)))
 134                 if (commit->object.flags & PREREQ_MARK)
 135                         i--;
 136
 137         for (i = 0; i < req_nr; i++)
 138                 if (!(refs.objects[i].item->flags & SHOWN)) {
 139                         if (++ret == 1)
 140                                 error(message);
 141                         error("%s %s", sha1_to_hex(refs.objects[i].item->sha1),
 142                                 refs.objects[i].name);
 143                 }
 144
 145         for (i = 0; i < refs.nr; i++)
 146                 clear_commit_marks((struct commit *)refs.objects[i].item, -1);
 147
 148         if (verbose) {
 149                 struct ref_list *r;
 150
 151                 r = &header->references;
 152                 printf("The bundle contains %d ref%s\n",
 153                        r->nr, (1 < r->nr) ? "s" : "");
 154                 list_refs(r, 0, NULL);
 155                 r = &header->prerequisites;
 156                 printf("The bundle requires these %d ref%s\n",
 157                        r->nr, (1 < r->nr) ? "s" : "");
 158                 list_refs(r, 0, NULL);
 159         }
 160         return ret;
 161 }
 162
 163 int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
 164 {
 165         return list_refs(&header->references, argc, argv);
 166 }
 167
 168 int create_bundle(struct bundle_header *header, const char *path,
 169                 int argc, const char **argv)
 170 {
 171         static struct lock_file lock;
 172         int bundle_fd = -1;
 173         int bundle_to_stdout;
 174         const char **argv_boundary = xmalloc((argc + 4) * sizeof(const char *));
 175         const char **argv_pack = xmalloc(5 * sizeof(const char *));
 176         int i, ref_count = 0;
 177         char buffer[1024];
 178         struct rev_info revs;
 179         struct child_process rls;
 180         FILE *rls_fout;
 181
 182         bundle_to_stdout = !strcmp(path, "-");
 183         if (bundle_to_stdout)
 184                 bundle_fd = 1;
 185         else
 186                 bundle_fd = hold_lock_file_for_update(&lock, path, 1);
 187
 188         /* write signature */
 189         write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
 190
 191         /* init revs to list objects for pack-objects later */
 192         save_commit_buffer = 0;
 193         init_revisions(&revs, NULL);
 194
 195         /* write prerequisites */
 196         memcpy(argv_boundary + 3, argv + 1, argc * sizeof(const char *));
 197         argv_boundary[0] = "rev-list";
 198         argv_boundary[1] = "--boundary";
 199         argv_boundary[2] = "--pretty=oneline";
 200         argv_boundary[argc + 2] = NULL;
 201         memset(&rls, 0, sizeof(rls));
 202         rls.argv = argv_boundary;
 203         rls.out = -1;
 204         rls.git_cmd = 1;
 205         if (start_command(&rls))
 206                 return -1;
 207         rls_fout = fdopen(rls.out, "r");
 208         while (fgets(buffer, sizeof(buffer), rls_fout)) {
 209                 unsigned char sha1[20];
 210                 if (buffer[0] == '-') {
 211                         write_or_die(bundle_fd, buffer, strlen(buffer));
 212                         if (!get_sha1_hex(buffer + 1, sha1)) {
 213                                 struct object *object = parse_object(sha1);
 214                                 object->flags |= UNINTERESTING;
 215                                 add_pending_object(&revs, object, buffer);
 216                         }
 217                 } else if (!get_sha1_hex(buffer, sha1)) {
 218                         struct object *object = parse_object(sha1);
 219                         object->flags |= SHOWN;
 220                 }
 221         }
 222         fclose(rls_fout);
 223         if (finish_command(&rls))
 224                 return error("rev-list died");
 225
 226         /* write references */
 227         argc = setup_revisions(argc, argv, &revs, NULL);
 228         if (argc > 1)
 229                 return error("unrecognized argument: %s'", argv[1]);
 230
 231         for (i = 0; i < revs.pending.nr; i++) {
 232                 struct object_array_entry *e = revs.pending.objects + i;
 233                 unsigned char sha1[20];
 234                 char *ref;
 235
 236                 if (e->item->flags & UNINTERESTING)
 237                         continue;
 238                 if (dwim_ref(e->name, strlen(e->name), sha1, &ref) != 1)
 239                         continue;
 240                 /*
 241                  * Make sure the refs we wrote out is correct; --max-count and
 242                  * other limiting options could have prevented all the tips
 243                  * from getting output.
 244                  *
 245                  * Non commit objects such as tags and blobs do not have
 246                  * this issue as they are not affected by those extra
 247                  * constraints.
 248                  */
 249                 if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
 250                         warning("ref '%s' is excluded by the rev-list options",
 251                                 e->name);
 252                         free(ref);
 253                         continue;
 254                 }
 255                 /*
 256                  * If you run "git bundle create bndl v1.0..v2.0", the
 257                  * name of the positive ref is "v2.0" but that is the
 258                  * commit that is referenced by the tag, and not the tag
 259                  * itself.
 260                  */
 261                 if (hashcmp(sha1, e->item->sha1)) {
 262                         /*
 263                          * Is this the positive end of a range expressed
 264                          * in terms of a tag (e.g. v2.0 from the range
 265                          * "v1.0..v2.0")?
 266                          */
 267                         struct commit *one = lookup_commit_reference(sha1);
 268                         struct object *obj;
 269
 270                         if (e->item == &(one->object)) {
 271                                 /*
 272                                  * Need to include e->name as an
 273                                  * independent ref to the pack-objects
 274                                  * input, so that the tag is included
 275                                  * in the output; otherwise we would
 276                                  * end up triggering "empty bundle"
 277                                  * error.
 278                                  */
 279                                 obj = parse_object(sha1);
 280                                 obj->flags |= SHOWN;
 281                                 add_pending_object(&revs, obj, e->name);
 282                         }
 283                         free(ref);
 284                         continue;
 285                 }
 286
 287                 ref_count++;
 288                 write_or_die(bundle_fd, sha1_to_hex(e->item->sha1), 40);
 289                 write_or_die(bundle_fd, " ", 1);
 290                 write_or_die(bundle_fd, ref, strlen(ref));
 291                 write_or_die(bundle_fd, "\n", 1);
 292                 free(ref);
 293         }
 294         if (!ref_count)
 295                 die ("Refusing to create empty bundle.");
 296
 297         /* end header */
 298         write_or_die(bundle_fd, "\n", 1);
 299
 300         /* write pack */
 301         argv_pack[0] = "pack-objects";
 302         argv_pack[1] = "--all-progress";
 303         argv_pack[2] = "--stdout";
 304         argv_pack[3] = "--thin";
 305         argv_pack[4] = NULL;
 306         memset(&rls, 0, sizeof(rls));
 307         rls.argv = argv_pack;
 308         rls.in = -1;
 309         rls.out = bundle_fd;
 310         rls.git_cmd = 1;
 311         if (start_command(&rls))
 312                 return error("Could not spawn pack-objects");
 313         for (i = 0; i < revs.pending.nr; i++) {
 314                 struct object *object = revs.pending.objects[i].item;
 315                 if (object->flags & UNINTERESTING)
 316                         write(rls.in, "^", 1);
 317                 write(rls.in, sha1_to_hex(object->sha1), 40);
 318                 write(rls.in, "\n", 1);
 319         }
 320         if (finish_command(&rls))
 321                 return error ("pack-objects died");
 322         close(bundle_fd);
 323         if (!bundle_to_stdout)
 324                 commit_lock_file(&lock);
 325         return 0;
 326 }
 327
 328 int unbundle(struct bundle_header *header, int bundle_fd)
 329 {
 330         const char *argv_index_pack[] = {"index-pack",
 331                 "--fix-thin", "--stdin", NULL};
 332         struct child_process ip;
 333
 334         if (verify_bundle(header, 0))
 335                 return -1;
 336         memset(&ip, 0, sizeof(ip));
 337         ip.argv = argv_index_pack;
 338         ip.in = bundle_fd;
 339         ip.no_stdout = 1;
 340         ip.git_cmd = 1;
 341         if (run_command(&ip))
 342                 return error("index-pack died");
 343         return 0;
 344 }