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(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(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, 1);
 190
 191         /* write signature */
 192         write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
 193
 194         /* init revs to list objects for pack-objects later */
 195         save_commit_buffer = 0;
 196         init_revisions(&revs, NULL);
 197
 198         /* write prerequisites */
 199         memcpy(argv_boundary + 3, argv + 1, argc * sizeof(const char *));
 200         argv_boundary[0] = "rev-list";
 201         argv_boundary[1] = "--boundary";
 202         argv_boundary[2] = "--pretty=oneline";
 203         argv_boundary[argc + 2] = NULL;
 204         memset(&rls, 0, sizeof(rls));
 205         rls.argv = argv_boundary;
 206         rls.out = -1;
 207         rls.git_cmd = 1;
 208         if (start_command(&rls))
 209                 return -1;
 210         rls_fout = fdopen(rls.out, "r");
 211         while (fgets(buffer, sizeof(buffer), rls_fout)) {
 212                 unsigned char sha1[20];
 213                 if (buffer[0] == '-') {
 214                         write_or_die(bundle_fd, buffer, strlen(buffer));
 215                         if (!get_sha1_hex(buffer + 1, sha1)) {
 216                                 struct object *object = parse_object(sha1);
 217                                 object->flags |= UNINTERESTING;
 218                                 add_pending_object(&revs, object, buffer);
 219                         }
 220                 } else if (!get_sha1_hex(buffer, sha1)) {
 221                         struct object *object = parse_object(sha1);
 222                         object->flags |= SHOWN;
 223                 }
 224         }
 225         fclose(rls_fout);
 226         if (finish_command(&rls))
 227                 return error("rev-list died");
 228
 229         /* write references */
 230         argc = setup_revisions(argc, argv, &revs, NULL);
 231
 232         for (i = 1; i < argc; i++) {
 233                 if (!strcmp(argv[i], "--stdin")) {
 234                         if (read_from_stdin++)
 235                                 die("--stdin given twice?");
 236                         read_revisions_from_stdin(&revs);
 237                         continue;
 238                 }
 239                 return error("unrecognized argument: %s'", argv[i]);
 240         }
 241
 242         for (i = 0; i < revs.pending.nr; i++) {
 243                 struct object_array_entry *e = revs.pending.objects + i;
 244                 unsigned char sha1[20];
 245                 char *ref;
 246                 const char *display_ref;
 247                 int flag;
 248
 249                 if (e->item->flags & UNINTERESTING)
 250                         continue;
 251                 if (dwim_ref(e->name, strlen(e->name), sha1, &ref) != 1)
 252                         continue;
 253                 if (!resolve_ref(e->name, sha1, 1, &flag))
 254                         flag = 0;
 255                 display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
 256
 257                 /*
 258                  * Make sure the refs we wrote out is correct; --max-count and
 259                  * other limiting options could have prevented all the tips
 260                  * from getting output.
 261                  *
 262                  * Non commit objects such as tags and blobs do not have
 263                  * this issue as they are not affected by those extra
 264                  * constraints.
 265                  */
 266                 if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
 267                         warning("ref '%s' is excluded by the rev-list options",
 268                                 e->name);
 269                         free(ref);
 270                         continue;
 271                 }
 272                 /*
 273                  * If you run "git bundle create bndl v1.0..v2.0", the
 274                  * name of the positive ref is "v2.0" but that is the
 275                  * commit that is referenced by the tag, and not the tag
 276                  * itself.
 277                  */
 278                 if (hashcmp(sha1, e->item->sha1)) {
 279                         /*
 280                          * Is this the positive end of a range expressed
 281                          * in terms of a tag (e.g. v2.0 from the range
 282                          * "v1.0..v2.0")?
 283                          */
 284                         struct commit *one = lookup_commit_reference(sha1);
 285                         struct object *obj;
 286
 287                         if (e->item == &(one->object)) {
 288                                 /*
 289                                  * Need to include e->name as an
 290                                  * independent ref to the pack-objects
 291                                  * input, so that the tag is included
 292                                  * in the output; otherwise we would
 293                                  * end up triggering "empty bundle"
 294                                  * error.
 295                                  */
 296                                 obj = parse_object(sha1);
 297                                 obj->flags |= SHOWN;
 298                                 add_pending_object(&revs, obj, e->name);
 299                         }
 300                         free(ref);
 301                         continue;
 302                 }
 303
 304                 ref_count++;
 305                 write_or_die(bundle_fd, sha1_to_hex(e->item->sha1), 40);
 306                 write_or_die(bundle_fd, " ", 1);
 307                 write_or_die(bundle_fd, display_ref, strlen(display_ref));
 308                 write_or_die(bundle_fd, "\n", 1);
 309                 free(ref);
 310         }
 311         if (!ref_count)
 312                 die ("Refusing to create empty bundle.");
 313
 314         /* end header */
 315         write_or_die(bundle_fd, "\n", 1);
 316
 317         /* write pack */
 318         argv_pack[0] = "pack-objects";
 319         argv_pack[1] = "--all-progress";
 320         argv_pack[2] = "--stdout";
 321         argv_pack[3] = "--thin";
 322         argv_pack[4] = NULL;
 323         memset(&rls, 0, sizeof(rls));
 324         rls.argv = argv_pack;
 325         rls.in = -1;
 326         rls.out = bundle_fd;
 327         rls.git_cmd = 1;
 328         if (start_command(&rls))
 329                 return error("Could not spawn pack-objects");
 330
 331         /*
 332          * start_command closed bundle_fd if it was > 1
 333          * so set the lock fd to -1 so commit_lock_file()
 334          * won't fail trying to close it.
 335          */
 336         lock.fd = -1;
 337
 338         for (i = 0; i < revs.pending.nr; i++) {
 339                 struct object *object = revs.pending.objects[i].item;
 340                 if (object->flags & UNINTERESTING)
 341                         write_or_die(rls.in, "^", 1);
 342                 write_or_die(rls.in, sha1_to_hex(object->sha1), 40);
 343                 write_or_die(rls.in, "\n", 1);
 344         }
 345         close(rls.in);
 346         if (finish_command(&rls))
 347                 return error ("pack-objects died");
 348         if (!bundle_to_stdout)
 349                 commit_lock_file(&lock);
 350         return 0;
 351 }
 352
 353 int unbundle(struct bundle_header *header, int bundle_fd)
 354 {
 355         const char *argv_index_pack[] = {"index-pack",
 356                 "--fix-thin", "--stdin", NULL};
 357         struct child_process ip;
 358
 359         if (verify_bundle(header, 0))
 360                 return -1;
 361         memset(&ip, 0, sizeof(ip));
 362         ip.argv = argv_index_pack;
 363         ip.in = bundle_fd;
 364         ip.no_stdout = 1;
 365         ip.git_cmd = 1;
 366         if (run_command(&ip))
 367                 return error("index-pack died");
 368         return 0;
 369 }