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         char buffer[1024];
  28         int fd;
  29         long fpos;
  30         FILE *ffd = fopen(path, "rb");
  31
  32         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
  49                 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 }
  69
  70 static int list_refs(struct ref_list *r, int argc, const char **argv)
  71 {
  72         int i;
  73
  74         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
  89 #define PREREQ_MARK (1u<<16)
  90
  91 int 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
 105         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
 123         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
 129         prepare_revision_walk(&revs);
 130
 131         i = req_nr;
 132         while (i && (commit = get_revision(&revs)))
 133                 if (commit->object.flags & PREREQ_MARK)
 134                         i--;
 135
 136         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
 144         for (i = 0; i < refs.nr; i++)
 145                 clear_commit_marks((struct commit *)refs.objects[i].item, -1);
 146
 147         if (verbose) {
 148                 struct ref_list *r;
 149
 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;
 160 }
 161
 162 int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
 163 {
 164         return list_refs(&header->references, argc, argv);
 165 }
 166
 167 int 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
 181         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
 187         /* write signature */
 188         write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
 189
 190         /* init revs to list objects for pack-objects later */
 191         save_commit_buffer = 0;
 192         init_revisions(&revs, NULL);
 193
 194         /* 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
 225         /* write references */
 226         argc = setup_revisions(argc, argv, &revs, NULL);
 227         if (argc > 1)
 228                 return error("unrecognized argument: %s'", argv[1]);
 229
 230         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
 235                 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
 269                         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
 286                 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
 296         /* end header */
 297         write_or_die(bundle_fd, "\n", 1);
 298
 299         /* 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 }
 326
 327 int 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
 333         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 }