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 #include "argv-array.h"
  11
  12 static const char bundle_signature[] = "# v2 git bundle\n";
  13
  14 static void add_to_ref_list(const unsigned char *sha1, const char *name,
  15                 struct ref_list *list)
  16 {
  17         ALLOC_GROW(list->list, list->nr + 1, list->alloc);
  18         hashcpy(list->list[list->nr].sha1, sha1);
  19         list->list[list->nr].name = xstrdup(name);
  20         list->nr++;
  21 }
  22
  23 static int parse_bundle_header(int fd, struct bundle_header *header,
  24                                const char *report_path)
  25 {
  26         struct strbuf buf = STRBUF_INIT;
  27         int status = 0;
  28
  29         /* The bundle header begins with the signature */
  30         if (strbuf_getwholeline_fd(&buf, fd, '\n') ||
  31             strcmp(buf.buf, bundle_signature)) {
  32                 if (report_path)
  33                         error(_("'%s' does not look like a v2 bundle file"),
  34                               report_path);
  35                 status = -1;
  36                 goto abort;
  37         }
  38
  39         /* The bundle header ends with an empty line */
  40         while (!strbuf_getwholeline_fd(&buf, fd, '\n') &&
  41                buf.len && buf.buf[0] != '\n') {
  42                 unsigned char sha1[20];
  43                 int is_prereq = 0;
  44
  45                 if (*buf.buf == '-') {
  46                         is_prereq = 1;
  47                         strbuf_remove(&buf, 0, 1);
  48                 }
  49                 strbuf_rtrim(&buf);
  50
  51                 /*
  52                  * Tip lines have object name, SP, and refname.
  53                  * Prerequisites have object name that is optionally
  54                  * followed by SP and subject line.
  55                  */
  56                 if (get_sha1_hex(buf.buf, sha1) ||
  57                     (buf.len > 40 && !isspace(buf.buf[40])) ||
  58                     (!is_prereq && buf.len <= 40)) {
  59                         if (report_path)
  60                                 error(_("unrecognized header: %s%s (%d)"),
  61                                       (is_prereq ? "-" : ""), buf.buf, (int)buf.len);
  62                         status = -1;
  63                         break;
  64                 } else {
  65                         if (is_prereq)
  66                                 add_to_ref_list(sha1, "", &header->prerequisites);
  67                         else
  68                                 add_to_ref_list(sha1, buf.buf + 41, &header->references);
  69                 }
  70         }
  71
  72  abort:
  73         if (status) {
  74                 close(fd);
  75                 fd = -1;
  76         }
  77         strbuf_release(&buf);
  78         return fd;
  79 }
  80
  81 int read_bundle_header(const char *path, struct bundle_header *header)
  82 {
  83         int fd = open(path, O_RDONLY);
  84
  85         if (fd < 0)
  86                 return error(_("could not open '%s'"), path);
  87         return parse_bundle_header(fd, header, path);
  88 }
  89
  90 int is_bundle(const char *path, int quiet)
  91 {
  92         struct bundle_header header;
  93         int fd = open(path, O_RDONLY);
  94
  95         if (fd < 0)
  96                 return 0;
  97         memset(&header, 0, sizeof(header));
  98         fd = parse_bundle_header(fd, &header, quiet ? NULL : path);
  99         if (fd >= 0)
 100                 close(fd);
 101         return (fd >= 0);
 102 }
 103
 104 static int list_refs(struct ref_list *r, int argc, const char **argv)
 105 {
 106         int i;
 107
 108         for (i = 0; i < r->nr; i++) {
 109                 if (argc > 1) {
 110                         int j;
 111                         for (j = 1; j < argc; j++)
 112                                 if (!strcmp(r->list[i].name, argv[j]))
 113                                         break;
 114                         if (j == argc)
 115                                 continue;
 116                 }
 117                 printf("%s %s\n", sha1_to_hex(r->list[i].sha1),
 118                                 r->list[i].name);
 119         }
 120         return 0;
 121 }
 122
 123 #define PREREQ_MARK (1u<<16)
 124
 125 int verify_bundle(struct bundle_header *header, int verbose)
 126 {
 127         /*
 128          * Do fast check, then if any prereqs are missing then go line by line
 129          * to be verbose about the errors
 130          */
 131         struct ref_list *p = &header->prerequisites;
 132         struct rev_info revs;
 133         const char *argv[] = {NULL, "--all", NULL};
 134         struct object_array refs;
 135         struct commit *commit;
 136         int i, ret = 0, req_nr;
 137         const char *message = _("Repository lacks these prerequisite commits:");
 138
 139         init_revisions(&revs, NULL);
 140         for (i = 0; i < p->nr; i++) {
 141                 struct ref_list_entry *e = p->list + i;
 142                 struct object *o = parse_object(e->sha1);
 143                 if (o) {
 144                         o->flags |= PREREQ_MARK;
 145                         add_pending_object(&revs, o, e->name);
 146                         continue;
 147                 }
 148                 if (++ret == 1)
 149                         error("%s", message);
 150                 error("%s %s", sha1_to_hex(e->sha1), e->name);
 151         }
 152         if (revs.pending.nr != p->nr)
 153                 return ret;
 154         req_nr = revs.pending.nr;
 155         setup_revisions(2, argv, &revs, NULL);
 156
 157         refs = revs.pending;
 158         revs.leak_pending = 1;
 159
 160         if (prepare_revision_walk(&revs))
 161                 die(_("revision walk setup failed"));
 162
 163         i = req_nr;
 164         while (i && (commit = get_revision(&revs)))
 165                 if (commit->object.flags & PREREQ_MARK)
 166                         i--;
 167
 168         for (i = 0; i < req_nr; i++)
 169                 if (!(refs.objects[i].item->flags & SHOWN)) {
 170                         if (++ret == 1)
 171                                 error("%s", message);
 172                         error("%s %s", sha1_to_hex(refs.objects[i].item->sha1),
 173                                 refs.objects[i].name);
 174                 }
 175
 176         clear_commit_marks_for_object_array(&refs, ALL_REV_FLAGS);
 177         free(refs.objects);
 178
 179         if (verbose) {
 180                 struct ref_list *r;
 181
 182                 r = &header->references;
 183                 printf_ln(Q_("The bundle contains this ref:",
 184                              "The bundle contains these %d refs:",
 185                              r->nr),
 186                           r->nr);
 187                 list_refs(r, 0, NULL);
 188                 r = &header->prerequisites;
 189                 if (!r->nr) {
 190                         printf_ln(_("The bundle records a complete history."));
 191                 } else {
 192                         printf_ln(Q_("The bundle requires this ref:",
 193                                      "The bundle requires these %d refs:",
 194                                      r->nr),
 195                                   r->nr);
 196                         list_refs(r, 0, NULL);
 197                 }
 198         }
 199         return ret;
 200 }
 201
 202 int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
 203 {
 204         return list_refs(&header->references, argc, argv);
 205 }
 206
 207 static int is_tag_in_date_range(struct object *tag, struct rev_info *revs)
 208 {
 209         unsigned long size;
 210         enum object_type type;
 211         char *buf, *line, *lineend;
 212         unsigned long date;
 213
 214         if (revs->max_age == -1 && revs->min_age == -1)
 215                 return 1;
 216
 217         buf = read_sha1_file(tag->sha1, &type, &size);
 218         if (!buf)
 219                 return 1;
 220         line = memmem(buf, size, "\ntagger ", 8);
 221         if (!line++)
 222                 return 1;
 223         lineend = memchr(line, buf + size - line, '\n');
 224         line = memchr(line, lineend ? lineend - line : buf + size - line, '>');
 225         if (!line++)
 226                 return 1;
 227         date = strtoul(line, NULL, 10);
 228         free(buf);
 229         return (revs->max_age == -1 || revs->max_age < date) &&
 230                 (revs->min_age == -1 || revs->min_age > date);
 231 }
 232
 233 int create_bundle(struct bundle_header *header, const char *path,
 234                   int argc, const char **argv)
 235 {
 236         static struct lock_file lock;
 237         int bundle_fd = -1;
 238         int bundle_to_stdout;
 239         struct argv_array argv_boundary = ARGV_ARRAY_INIT;
 240         struct argv_array argv_pack = ARGV_ARRAY_INIT;
 241         int i, ref_count = 0;
 242         struct strbuf buf = STRBUF_INIT;
 243         struct rev_info revs;
 244         struct child_process rls;
 245         FILE *rls_fout;
 246
 247         bundle_to_stdout = !strcmp(path, "-");
 248         if (bundle_to_stdout)
 249                 bundle_fd = 1;
 250         else
 251                 bundle_fd = hold_lock_file_for_update(&lock, path,
 252                                                       LOCK_DIE_ON_ERROR);
 253
 254         /* write signature */
 255         write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
 256
 257         /* init revs to list objects for pack-objects later */
 258         save_commit_buffer = 0;
 259         init_revisions(&revs, NULL);
 260
 261         /* write prerequisites */
 262         argv_array_pushl(&argv_boundary,
 263                          "rev-list", "--boundary", "--pretty=oneline",
 264                          NULL);
 265         for (i = 1; i < argc; i++)
 266                 argv_array_push(&argv_boundary, argv[i]);
 267
 268         memset(&rls, 0, sizeof(rls));
 269         rls.argv = argv_boundary.argv;
 270         rls.out = -1;
 271         rls.git_cmd = 1;
 272         if (start_command(&rls))
 273                 return -1;
 274         rls_fout = xfdopen(rls.out, "r");
 275         while (strbuf_getwholeline(&buf, rls_fout, '\n') != EOF) {
 276                 unsigned char sha1[20];
 277                 if (buf.len > 0 && buf.buf[0] == '-') {
 278                         write_or_die(bundle_fd, buf.buf, buf.len);
 279                         if (!get_sha1_hex(buf.buf + 1, sha1)) {
 280                                 struct object *object = parse_object_or_die(sha1, buf.buf);
 281                                 object->flags |= UNINTERESTING;
 282                                 add_pending_object(&revs, object, buf.buf);
 283                         }
 284                 } else if (!get_sha1_hex(buf.buf, sha1)) {
 285                         struct object *object = parse_object_or_die(sha1, buf.buf);
 286                         object->flags |= SHOWN;
 287                 }
 288         }
 289         strbuf_release(&buf);
 290         fclose(rls_fout);
 291         if (finish_command(&rls))
 292                 return error(_("rev-list died"));
 293
 294         /* write references */
 295         argc = setup_revisions(argc, argv, &revs, NULL);
 296
 297         if (argc > 1)
 298                 return error(_("unrecognized argument: %s"), argv[1]);
 299
 300         object_array_remove_duplicates(&revs.pending);
 301
 302         for (i = 0; i < revs.pending.nr; i++) {
 303                 struct object_array_entry *e = revs.pending.objects + i;
 304                 unsigned char sha1[20];
 305                 char *ref;
 306                 const char *display_ref;
 307                 int flag;
 308
 309                 if (e->item->flags & UNINTERESTING)
 310                         continue;
 311                 if (dwim_ref(e->name, strlen(e->name), sha1, &ref) != 1)
 312                         continue;
 313                 if (read_ref_full(e->name, sha1, 1, &flag))
 314                         flag = 0;
 315                 display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
 316
 317                 if (e->item->type == OBJ_TAG &&
 318                                 !is_tag_in_date_range(e->item, &revs)) {
 319                         e->item->flags |= UNINTERESTING;
 320                         continue;
 321                 }
 322
 323                 /*
 324                  * Make sure the refs we wrote out is correct; --max-count and
 325                  * other limiting options could have prevented all the tips
 326                  * from getting output.
 327                  *
 328                  * Non commit objects such as tags and blobs do not have
 329                  * this issue as they are not affected by those extra
 330                  * constraints.
 331                  */
 332                 if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
 333                         warning(_("ref '%s' is excluded by the rev-list options"),
 334                                 e->name);
 335                         free(ref);
 336                         continue;
 337                 }
 338                 /*
 339                  * If you run "git bundle create bndl v1.0..v2.0", the
 340                  * name of the positive ref is "v2.0" but that is the
 341                  * commit that is referenced by the tag, and not the tag
 342                  * itself.
 343                  */
 344                 if (hashcmp(sha1, e->item->sha1)) {
 345                         /*
 346                          * Is this the positive end of a range expressed
 347                          * in terms of a tag (e.g. v2.0 from the range
 348                          * "v1.0..v2.0")?
 349                          */
 350                         struct commit *one = lookup_commit_reference(sha1);
 351                         struct object *obj;
 352
 353                         if (e->item == &(one->object)) {
 354                                 /*
 355                                  * Need to include e->name as an
 356                                  * independent ref to the pack-objects
 357                                  * input, so that the tag is included
 358                                  * in the output; otherwise we would
 359                                  * end up triggering "empty bundle"
 360                                  * error.
 361                                  */
 362                                 obj = parse_object_or_die(sha1, e->name);
 363                                 obj->flags |= SHOWN;
 364                                 add_pending_object(&revs, obj, e->name);
 365                         }
 366                         free(ref);
 367                         continue;
 368                 }
 369
 370                 ref_count++;
 371                 write_or_die(bundle_fd, sha1_to_hex(e->item->sha1), 40);
 372                 write_or_die(bundle_fd, " ", 1);
 373                 write_or_die(bundle_fd, display_ref, strlen(display_ref));
 374                 write_or_die(bundle_fd, "\n", 1);
 375                 free(ref);
 376         }
 377         if (!ref_count)
 378                 die(_("Refusing to create empty bundle."));
 379
 380         /* end header */
 381         write_or_die(bundle_fd, "\n", 1);
 382
 383         /* write pack */
 384         argv_array_pushl(&argv_pack,
 385                          "pack-objects", "--all-progress-implied",
 386                          "--stdout", "--thin", "--delta-base-offset",
 387                          NULL);
 388         memset(&rls, 0, sizeof(rls));
 389         rls.argv = argv_pack.argv;
 390         rls.in = -1;
 391         rls.out = bundle_fd;
 392         rls.git_cmd = 1;
 393         if (start_command(&rls))
 394                 return error(_("Could not spawn pack-objects"));
 395
 396         /*
 397          * start_command closed bundle_fd if it was > 1
 398          * so set the lock fd to -1 so commit_lock_file()
 399          * won't fail trying to close it.
 400          */
 401         lock.fd = -1;
 402
 403         for (i = 0; i < revs.pending.nr; i++) {
 404                 struct object *object = revs.pending.objects[i].item;
 405                 if (object->flags & UNINTERESTING)
 406                         write_or_die(rls.in, "^", 1);
 407                 write_or_die(rls.in, sha1_to_hex(object->sha1), 40);
 408                 write_or_die(rls.in, "\n", 1);
 409         }
 410         close(rls.in);
 411         if (finish_command(&rls))
 412                 return error(_("pack-objects died"));
 413         if (!bundle_to_stdout) {
 414                 if (commit_lock_file(&lock))
 415                         die_errno(_("cannot create '%s'"), path);
 416         }
 417         return 0;
 418 }
 419
 420 int unbundle(struct bundle_header *header, int bundle_fd, int flags)
 421 {
 422         const char *argv_index_pack[] = {"index-pack",
 423                                          "--fix-thin", "--stdin", NULL, NULL};
 424         struct child_process ip;
 425
 426         if (flags & BUNDLE_VERBOSE)
 427                 argv_index_pack[3] = "-v";
 428
 429         if (verify_bundle(header, 0))
 430                 return -1;
 431         memset(&ip, 0, sizeof(ip));
 432         ip.argv = argv_index_pack;
 433         ip.in = bundle_fd;
 434         ip.no_stdout = 1;
 435         ip.git_cmd = 1;
 436         if (run_command(&ip))
 437                 return error(_("index-pack died"));
 438         return 0;
 439 }