lib/repository_admin.c

   1 /*
   2  * Copyright (c) 2020 Stefan Sperling <stsp@openbsd.org>
   3  *
   4  * Permission to use, copy, modify, and distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include "got_compat.h"
  18
  19 #include <sys/types.h>
  20 #include <sys/queue.h>
  21 #include <sys/uio.h>
  22 #include <sys/stat.h>
  23 #include <sys/socket.h>
  24 #include <sys/wait.h>
  25
  26 #include <dirent.h>
  27 #include <errno.h>
  28 #include <fcntl.h>
  29 #include <stdint.h>
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <limits.h>
  34 #include <unistd.h>
  35
  36 #include "got_error.h"
  37 #include "got_cancel.h"
  38 #include "got_object.h"
  39 #include "got_reference.h"
  40 #include "got_repository.h"
  41 #include "got_repository_admin.h"
  42 #include "got_opentemp.h"
  43 #include "got_path.h"
  44
  45 #include "got_lib_delta.h"
  46 #include "got_lib_object.h"
  47 #include "got_lib_object_idset.h"
  48 #include "got_lib_object_cache.h"
  49 #include "got_lib_pack.h"
  50 #include "got_lib_privsep.h"
  51 #include "got_lib_repository.h"
  52 #include "got_lib_ratelimit.h"
  53 #include "got_lib_pack_create.h"
  54 #include "got_lib_hash.h"
  55 #include "got_lib_lockfile.h"
  56
  57 #ifndef nitems
  58 #define nitems(_a)      (sizeof((_a)) / sizeof((_a)[0]))
  59 #endif
  60
  61 static const struct got_error *
  62 get_reflist_object_ids(struct got_object_id ***ids, int *nobjects,
  63     unsigned int wanted_obj_type_mask, struct got_reflist_head *refs,
  64     struct got_repository *repo,
  65     got_cancel_cb cancel_cb, void *cancel_arg)
  66 {
  67         const struct got_error *err = NULL;
  68         const size_t alloc_chunksz = 256;
  69         size_t nalloc;
  70         struct got_reflist_entry *re;
  71         int i;
  72
  73         *ids = NULL;
  74         *nobjects = 0;
  75
  76         err = got_reflist_sort(refs,
  77             got_ref_cmp_by_commit_timestamp_descending, repo);
  78         if (err)
  79                 return err;
  80
  81         *ids = reallocarray(NULL, alloc_chunksz, sizeof(struct got_object_id *));
  82         if (*ids == NULL)
  83                 return got_error_from_errno("reallocarray");
  84         nalloc = alloc_chunksz;
  85
  86         TAILQ_FOREACH(re, refs, entry) {
  87                 struct got_object_id *id;
  88
  89                 if (cancel_cb) {
  90                         err = cancel_cb(cancel_arg);
  91                         if (err)
  92                                 goto done;
  93                 }
  94
  95                 err = got_ref_resolve(&id, repo, re->ref);
  96                 if (err)
  97                         goto done;
  98
  99                 if (wanted_obj_type_mask != GOT_OBJ_TYPE_ANY) {
 100                         int obj_type;
 101                         err = got_object_get_type(&obj_type, repo, id);
 102                         if (err)
 103                                 goto done;
 104                         if ((wanted_obj_type_mask & (1 << obj_type)) == 0) {
 105                                 free(id);
 106                                 id = NULL;
 107                                 continue;
 108                         }
 109                 }
 110
 111                 if (nalloc <= *nobjects) {
 112                         struct got_object_id **new;
 113                         new = recallocarray(*ids, nalloc,
 114                             nalloc + alloc_chunksz,
 115                             sizeof(struct got_object_id *));
 116                         if (new == NULL) {
 117                                 err = got_error_from_errno(
 118                                     "recallocarray");
 119                                 goto done;
 120                         }
 121                         *ids = new;
 122                         nalloc += alloc_chunksz;
 123                 }
 124                 (*ids)[*nobjects] = id;
 125                 if ((*ids)[*nobjects] == NULL) {
 126                         err = got_error_from_errno("got_object_id_dup");
 127                         goto done;
 128                 }
 129                 (*nobjects)++;
 130         }
 131 done:
 132         if (err) {
 133                 for (i = 0; i < *nobjects; i++)
 134                         free((*ids)[i]);
 135                 free(*ids);
 136                 *ids = NULL;
 137                 *nobjects = 0;
 138         }
 139         return err;
 140 }
 141
 142 const struct got_error *
 143 got_repo_pack_objects(FILE **packfile, struct got_object_id **pack_hash,
 144     struct got_reflist_head *include_refs,
 145     struct got_reflist_head *exclude_refs, struct got_repository *repo,
 146     int loose_obj_only, int force_refdelta,
 147     got_pack_progress_cb progress_cb, void *progress_arg,
 148     got_cancel_cb cancel_cb, void *cancel_arg)
 149 {
 150         const struct got_error *err = NULL;
 151         struct got_object_id **ours = NULL, **theirs = NULL;
 152         int nours = 0, ntheirs = 0, packfd = -1, i;
 153         char *tmpfile_path = NULL, *path = NULL, *packfile_path = NULL;
 154         char *sha1_str = NULL;
 155         FILE *delta_cache = NULL;
 156         struct got_ratelimit rl;
 157
 158         *packfile = NULL;
 159         *pack_hash = NULL;
 160
 161         got_ratelimit_init(&rl, 0, 500);
 162
 163         if (asprintf(&path, "%s/%s/packing.pack",
 164             got_repo_get_path_git_dir(repo), GOT_OBJECTS_PACK_DIR) == -1) {
 165                 err = got_error_from_errno("asprintf");
 166                 goto done;
 167         }
 168         err = got_opentemp_named_fd(&tmpfile_path, &packfd, path, "");
 169         if (err)
 170                 goto done;
 171
 172         if (fchmod(packfd, GOT_DEFAULT_PACK_MODE) == -1) {
 173                 err = got_error_from_errno2("fchmod", tmpfile_path);
 174                 goto done;
 175         }
 176
 177         delta_cache = got_opentemp();
 178         if (delta_cache == NULL) {
 179                 err = got_error_from_errno("got_opentemp");
 180                 goto done;
 181         }
 182
 183         err = get_reflist_object_ids(&ours, &nours,
 184             (1 << GOT_OBJ_TYPE_COMMIT) | (1 << GOT_OBJ_TYPE_TAG),
 185             include_refs, repo, cancel_cb, cancel_arg);
 186         if (err)
 187                 goto done;
 188
 189         if (nours == 0) {
 190                 err = got_error(GOT_ERR_CANNOT_PACK);
 191                 goto done;
 192         }
 193
 194         if (!TAILQ_EMPTY(exclude_refs)) {
 195                 err = get_reflist_object_ids(&theirs, &ntheirs,
 196                     (1 << GOT_OBJ_TYPE_COMMIT) | (1 << GOT_OBJ_TYPE_TAG),
 197                     exclude_refs, repo,
 198                     cancel_cb, cancel_arg);
 199                 if (err)
 200                         goto done;
 201         }
 202
 203         *pack_hash = calloc(1, sizeof(**pack_hash));
 204         if (*pack_hash == NULL) {
 205                 err = got_error_from_errno("calloc");
 206                 goto done;
 207         }
 208
 209         err = got_pack_create((*pack_hash)->sha1, packfd, delta_cache,
 210             theirs, ntheirs, ours, nours, repo, loose_obj_only,
 211             0, force_refdelta, progress_cb, progress_arg, &rl,
 212             cancel_cb, cancel_arg);
 213         if (err)
 214                 goto done;
 215
 216         err = got_object_id_str(&sha1_str, *pack_hash);
 217         if (err)
 218                 goto done;
 219         if (asprintf(&packfile_path, "%s/%s/pack-%s.pack",
 220             got_repo_get_path_git_dir(repo), GOT_OBJECTS_PACK_DIR,
 221             sha1_str) == -1) {
 222                 err = got_error_from_errno("asprintf");
 223                 goto done;
 224         }
 225
 226         if (lseek(packfd, 0L, SEEK_SET) == -1) {
 227                 err = got_error_from_errno("lseek");
 228                 goto done;
 229         }
 230         if (rename(tmpfile_path, packfile_path) == -1) {
 231                 err = got_error_from_errno3("rename", tmpfile_path,
 232                     packfile_path);
 233                 goto done;
 234         }
 235         free(tmpfile_path);
 236         tmpfile_path = NULL;
 237
 238         *packfile = fdopen(packfd, "w");
 239         if (*packfile == NULL) {
 240                 err = got_error_from_errno2("fdopen", tmpfile_path);
 241                 goto done;
 242         }
 243         packfd = -1;
 244 done:
 245         for (i = 0; i < nours; i++)
 246                 free(ours[i]);
 247         free(ours);
 248         for (i = 0; i < ntheirs; i++)
 249                 free(theirs[i]);
 250         free(theirs);
 251         if (packfd != -1 && close(packfd) == -1 && err == NULL)
 252                 err = got_error_from_errno2("close", packfile_path);
 253         if (delta_cache && fclose(delta_cache) == EOF && err == NULL)
 254                 err = got_error_from_errno("fclose");
 255         if (tmpfile_path && unlink(tmpfile_path) == -1 && err == NULL)
 256                 err = got_error_from_errno2("unlink", tmpfile_path);
 257         free(tmpfile_path);
 258         free(packfile_path);
 259         free(sha1_str);
 260         free(path);
 261         if (err) {
 262                 free(*pack_hash);
 263                 *pack_hash = NULL;
 264                 if (*packfile)
 265                         fclose(*packfile);
 266                 *packfile = NULL;
 267         }
 268         return err;
 269 }
 270
 271 const struct got_error *
 272 got_repo_index_pack(FILE *packfile, struct got_object_id *pack_hash,
 273     struct got_repository *repo,
 274     got_pack_index_progress_cb progress_cb, void *progress_arg,
 275     got_cancel_cb cancel_cb, void *cancel_arg)
 276 {
 277         size_t i;
 278         char *path;
 279         int imsg_idxfds[2];
 280         int npackfd = -1, idxfd = -1, nidxfd = -1;
 281         int tmpfds[3];
 282         int idxstatus, done = 0;
 283         const struct got_error *err;
 284         struct imsgbuf idxibuf;
 285         pid_t idxpid;
 286         char *tmpidxpath = NULL;
 287         char *packfile_path = NULL, *idxpath = NULL, *id_str = NULL;
 288         const char *repo_path = got_repo_get_path_git_dir(repo);
 289         struct stat sb;
 290
 291         for (i = 0; i < nitems(tmpfds); i++)
 292                 tmpfds[i] = -1;
 293
 294         if (asprintf(&path, "%s/%s/indexing.idx",
 295             repo_path, GOT_OBJECTS_PACK_DIR) == -1) {
 296                 err = got_error_from_errno("asprintf");
 297                 goto done;
 298         }
 299         err = got_opentemp_named_fd(&tmpidxpath, &idxfd, path, "");
 300         free(path);
 301         if (err)
 302                 goto done;
 303         if (fchmod(idxfd, GOT_DEFAULT_PACK_MODE) == -1) {
 304                 err = got_error_from_errno2("fchmod", tmpidxpath);
 305                 goto done;
 306         }
 307
 308         nidxfd = dup(idxfd);
 309         if (nidxfd == -1) {
 310                 err = got_error_from_errno("dup");
 311                 goto done;
 312         }
 313
 314         for (i = 0; i < nitems(tmpfds); i++) {
 315                 tmpfds[i] = got_opentempfd();
 316                 if (tmpfds[i] == -1) {
 317                         err = got_error_from_errno("got_opentempfd");
 318                         goto done;
 319                 }
 320         }
 321
 322         err = got_object_id_str(&id_str, pack_hash);
 323         if (err)
 324                 goto done;
 325
 326         if (asprintf(&packfile_path, "%s/%s/pack-%s.pack",
 327             repo_path, GOT_OBJECTS_PACK_DIR, id_str) == -1) {
 328                 err = got_error_from_errno("asprintf");
 329                 goto done;
 330         }
 331
 332         if (fstat(fileno(packfile), &sb) == -1) {
 333                 err = got_error_from_errno2("fstat", packfile_path);
 334                 goto done;
 335         }
 336
 337         if (asprintf(&idxpath, "%s/%s/pack-%s.idx",
 338             repo_path, GOT_OBJECTS_PACK_DIR, id_str) == -1) {
 339                 err = got_error_from_errno("asprintf");
 340                 goto done;
 341         }
 342
 343         if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_idxfds) == -1) {
 344                 err = got_error_from_errno("socketpair");
 345                 goto done;
 346         }
 347         idxpid = fork();
 348         if (idxpid == -1) {
 349                 err= got_error_from_errno("fork");
 350                 goto done;
 351         } else if (idxpid == 0)
 352                 got_privsep_exec_child(imsg_idxfds,
 353                     GOT_PATH_PROG_INDEX_PACK, packfile_path);
 354         if (close(imsg_idxfds[1]) == -1) {
 355                 err = got_error_from_errno("close");
 356                 goto done;
 357         }
 358         imsg_init(&idxibuf, imsg_idxfds[0]);
 359
 360         npackfd = dup(fileno(packfile));
 361         if (npackfd == -1) {
 362                 err = got_error_from_errno("dup");
 363                 goto done;
 364         }
 365         err = got_privsep_send_index_pack_req(&idxibuf, pack_hash->sha1,
 366             npackfd);
 367         if (err != NULL)
 368                 goto done;
 369         npackfd = -1;
 370         err = got_privsep_send_index_pack_outfd(&idxibuf, nidxfd);
 371         if (err != NULL)
 372                 goto done;
 373         nidxfd = -1;
 374         for (i = 0; i < nitems(tmpfds); i++) {
 375                 err = got_privsep_send_tmpfd(&idxibuf, tmpfds[i]);
 376                 if (err != NULL)
 377                         goto done;
 378                 tmpfds[i] = -1;
 379         }
 380         done = 0;
 381         while (!done) {
 382                 int nobj_total, nobj_indexed, nobj_loose, nobj_resolved;
 383
 384                 if (cancel_cb) {
 385                         err = cancel_cb(cancel_arg);
 386                         if (err)
 387                                 goto done;
 388                 }
 389
 390                 err = got_privsep_recv_index_progress(&done, &nobj_total,
 391                     &nobj_indexed, &nobj_loose, &nobj_resolved,
 392                     &idxibuf);
 393                 if (err != NULL)
 394                         goto done;
 395                 if (nobj_indexed != 0) {
 396                         err = progress_cb(progress_arg, sb.st_size,
 397                             nobj_total, nobj_indexed, nobj_loose,
 398                             nobj_resolved);
 399                         if (err)
 400                                 break;
 401                 }
 402         }
 403         if (close(imsg_idxfds[0]) == -1) {
 404                 err = got_error_from_errno("close");
 405                 goto done;
 406         }
 407         if (waitpid(idxpid, &idxstatus, 0) == -1) {
 408                 err = got_error_from_errno("waitpid");
 409                 goto done;
 410         }
 411
 412         if (rename(tmpidxpath, idxpath) == -1) {
 413                 err = got_error_from_errno3("rename", tmpidxpath, idxpath);
 414                 goto done;
 415         }
 416         free(tmpidxpath);
 417         tmpidxpath = NULL;
 418
 419 done:
 420         if (tmpidxpath && unlink(tmpidxpath) == -1 && err == NULL)
 421                 err = got_error_from_errno2("unlink", tmpidxpath);
 422         if (npackfd != -1 && close(npackfd) == -1 && err == NULL)
 423                 err = got_error_from_errno("close");
 424         if (idxfd != -1 && close(idxfd) == -1 && err == NULL)
 425                 err = got_error_from_errno("close");
 426         for (i = 0; i < nitems(tmpfds); i++) {
 427                 if (tmpfds[i] != -1 && close(tmpfds[i]) == -1 && err == NULL)
 428                         err = got_error_from_errno("close");
 429         }
 430         free(tmpidxpath);
 431         free(idxpath);
 432         free(packfile_path);
 433         return err;
 434 }
 435
 436 const struct got_error *
 437 got_repo_find_pack(FILE **packfile, struct got_object_id **pack_hash,
 438     struct got_repository *repo, const char *packfile_path)
 439 {
 440         const struct got_error *err = NULL;
 441         const char *packdir_path = NULL;
 442         char *packfile_name = NULL, *p, *dot;
 443         struct got_object_id id;
 444         int packfd = -1;
 445
 446         *packfile = NULL;
 447         *pack_hash = NULL;
 448
 449         packdir_path = got_repo_get_path_objects_pack(repo);
 450         if (packdir_path == NULL)
 451                 return got_error_from_errno("got_repo_get_path_objects_pack");
 452
 453         if (!got_path_is_child(packfile_path, packdir_path,
 454             strlen(packdir_path))) {
 455                 err = got_error_path(packfile_path, GOT_ERR_BAD_PATH);
 456                 goto done;
 457
 458         }
 459
 460         err = got_path_basename(&packfile_name, packfile_path);
 461         if (err)
 462                 goto done;
 463         p = packfile_name;
 464
 465         if (strncmp(p, "pack-", 5) != 0) {
 466                 err = got_error_fmt(GOT_ERR_BAD_PATH,
 467                     "'%s' is not a valid pack file name",
 468                     packfile_name);
 469                 goto done;
 470         }
 471         p += 5;
 472         dot = strchr(p, '.');
 473         if (dot == NULL) {
 474                 err = got_error_fmt(GOT_ERR_BAD_PATH,
 475                     "'%s' is not a valid pack file name",
 476                     packfile_name);
 477                 goto done;
 478         }
 479         if (strcmp(dot + 1, "pack") != 0) {
 480                 err = got_error_fmt(GOT_ERR_BAD_PATH,
 481                     "'%s' is not a valid pack file name",
 482                     packfile_name);
 483                 goto done;
 484         }
 485         *dot = '\0';
 486         if (!got_parse_object_id(&id, p, repo->algo)) {
 487                 err = got_error_fmt(GOT_ERR_BAD_PATH,
 488                     "'%s' is not a valid pack file name",
 489                     packfile_name);
 490                 goto done;
 491         }
 492
 493         *pack_hash = got_object_id_dup(&id);
 494         if (*pack_hash == NULL) {
 495                 err = got_error_from_errno("got_object_id_dup");
 496                 goto done;
 497         }
 498
 499         packfd = open(packfile_path, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
 500         if (packfd == -1) {
 501                 err = got_error_from_errno2("open", packfile_path);
 502                 goto done;
 503         }
 504
 505         *packfile = fdopen(packfd, "r");
 506         if (*packfile == NULL) {
 507                 err = got_error_from_errno2("fdopen", packfile_path);
 508                 goto done;
 509         }
 510         packfd = -1;
 511 done:
 512         if (packfd != -1 && close(packfd) == -1 && err == NULL)
 513                 err = got_error_from_errno2("close", packfile_path);
 514         free(packfile_name);
 515         if (err) {
 516                 free(*pack_hash);
 517                 *pack_hash = NULL;
 518         }
 519         return err;
 520 }
 521
 522 const struct got_error *
 523 got_repo_list_pack(FILE *packfile, struct got_object_id *pack_hash,
 524     struct got_repository *repo, got_pack_list_cb list_cb, void *list_arg,
 525     got_cancel_cb cancel_cb, void *cancel_arg)
 526 {
 527         const struct got_error *err = NULL;
 528         char *id_str = NULL, *idxpath = NULL, *packpath = NULL;
 529         struct got_packidx *packidx = NULL;
 530         struct got_pack *pack = NULL;
 531         uint32_t nobj, i;
 532
 533         err = got_object_id_str(&id_str, pack_hash);
 534         if (err)
 535                 goto done;
 536
 537         if (asprintf(&packpath, "%s/pack-%s.pack",
 538             GOT_OBJECTS_PACK_DIR, id_str) == -1) {
 539                 err = got_error_from_errno("asprintf");
 540                 goto done;
 541         }
 542         if (asprintf(&idxpath, "%s/pack-%s.idx",
 543             GOT_OBJECTS_PACK_DIR, id_str) == -1) {
 544                 err = got_error_from_errno("asprintf");
 545                 goto done;
 546         }
 547
 548         err = got_packidx_open(&packidx, got_repo_get_fd(repo), idxpath, 1);
 549         if (err)
 550                 goto done;
 551
 552         err = got_repo_cache_pack(&pack, repo, packpath, packidx);
 553         if (err)
 554                 goto done;
 555
 556         nobj = be32toh(packidx->hdr.fanout_table[0xff]);
 557         for (i = 0; i < nobj; i++) {
 558                 struct got_packidx_object_id *oid;
 559                 struct got_object_id id, base_id;
 560                 off_t offset, base_offset = 0;
 561                 uint8_t type;
 562                 uint64_t size;
 563                 size_t tslen, len;
 564
 565                 if (cancel_cb) {
 566                         err = cancel_cb(cancel_arg);
 567                         if (err)
 568                                 break;
 569                 }
 570                 oid = &packidx->hdr.sorted_ids[i];
 571                 memcpy(id.sha1, oid->sha1, SHA1_DIGEST_LENGTH);
 572
 573                 offset = got_packidx_get_object_offset(packidx, i);
 574                 if (offset == -1) {
 575                         err = got_error(GOT_ERR_BAD_PACKIDX);
 576                         goto done;
 577                 }
 578
 579                 err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
 580                     pack, offset);
 581                 if (err)
 582                         goto done;
 583
 584                 switch (type) {
 585                 case GOT_OBJ_TYPE_OFFSET_DELTA:
 586                         err = got_pack_parse_offset_delta(&base_offset, &len,
 587                             pack, offset, tslen);
 588                         if (err)
 589                                 goto done;
 590                         break;
 591                 case GOT_OBJ_TYPE_REF_DELTA:
 592                         err = got_pack_parse_ref_delta(&base_id,
 593                             pack, offset, tslen);
 594                         if (err)
 595                                 goto done;
 596                         break;
 597                 }
 598                 err = (*list_cb)(list_arg, &id, type, offset, size,
 599                     base_offset, &base_id);
 600                 if (err)
 601                         goto done;
 602         }
 603
 604 done:
 605         free(id_str);
 606         free(idxpath);
 607         free(packpath);
 608         if (packidx)
 609                 got_packidx_close(packidx);
 610         return err;
 611 }
 612
 613 static const struct got_error *
 614 report_cleanup_progress(got_cleanup_progress_cb progress_cb,
 615     void *progress_arg, struct got_ratelimit *rl,
 616     int nloose, int ncommits, int npurged)
 617 {
 618         const struct got_error *err;
 619         int elapsed;
 620
 621         if (progress_cb == NULL)
 622                 return NULL;
 623
 624         err = got_ratelimit_check(&elapsed, rl);
 625         if (err || !elapsed)
 626                 return err;
 627
 628         return progress_cb(progress_arg, nloose, ncommits, npurged);
 629 }
 630
 631 static const struct got_error *
 632 get_loose_object_ids(struct got_object_idset **loose_ids, off_t *ondisk_size,
 633     got_cleanup_progress_cb progress_cb, void *progress_arg,
 634     struct got_ratelimit *rl, struct got_repository *repo)
 635 {
 636         const struct got_error *err = NULL;
 637         char *path_objects = NULL, *path = NULL;
 638         DIR *dir = NULL;
 639         struct got_object *obj = NULL;
 640         struct got_object_id id;
 641         int i, fd = -1;
 642         struct stat sb;
 643
 644         *ondisk_size = 0;
 645         *loose_ids = got_object_idset_alloc();
 646         if (*loose_ids == NULL)
 647                 return got_error_from_errno("got_object_idset_alloc");
 648
 649         path_objects = got_repo_get_path_objects(repo);
 650         if (path_objects == NULL) {
 651                 err = got_error_from_errno("got_repo_get_path_objects");
 652                 goto done;
 653         }
 654
 655         for (i = 0; i <= 0xff; i++) {
 656                 struct dirent *dent;
 657
 658                 if (asprintf(&path, "%s/%.2x", path_objects, i) == -1) {
 659                         err = got_error_from_errno("asprintf");
 660                         break;
 661                 }
 662
 663                 dir = opendir(path);
 664                 if (dir == NULL) {
 665                         if (errno == ENOENT) {
 666                                 err = NULL;
 667                                 continue;
 668                         }
 669                         err = got_error_from_errno2("opendir", path);
 670                         break;
 671                 }
 672
 673                 while ((dent = readdir(dir)) != NULL) {
 674                         char *id_str;
 675
 676                         if (strcmp(dent->d_name, ".") == 0 ||
 677                             strcmp(dent->d_name, "..") == 0)
 678                                 continue;
 679
 680                         if (asprintf(&id_str, "%.2x%s", i, dent->d_name) == -1) {
 681                                 err = got_error_from_errno("asprintf");
 682                                 goto done;
 683                         }
 684
 685                         if (!got_parse_object_id(&id, id_str, repo->algo)) {
 686                                 free(id_str);
 687                                 continue;
 688                         }
 689                         free(id_str);
 690
 691                         err = got_object_open_loose_fd(&fd, &id, repo);
 692                         if (err)
 693                                 goto done;
 694                         if (fstat(fd, &sb) == -1) {
 695                                 err = got_error_from_errno("fstat");
 696                                 goto done;
 697                         }
 698                         err = got_object_read_header_privsep(&obj, &id, repo,
 699                             fd);
 700                         if (err)
 701                                 goto done;
 702                         fd = -1; /* already closed */
 703
 704                         switch (obj->type) {
 705                         case GOT_OBJ_TYPE_COMMIT:
 706                         case GOT_OBJ_TYPE_TREE:
 707                         case GOT_OBJ_TYPE_BLOB:
 708                         case GOT_OBJ_TYPE_TAG:
 709                                 break;
 710                         default:
 711                                 err = got_error_fmt(GOT_ERR_OBJ_TYPE,
 712                                     "%d", obj->type);
 713                                 goto done;
 714                         }
 715                         got_object_close(obj);
 716                         obj = NULL;
 717                         (*ondisk_size) += sb.st_size;
 718                         err = got_object_idset_add(*loose_ids, &id, NULL);
 719                         if (err)
 720                                 goto done;
 721                         err = report_cleanup_progress(progress_cb,
 722                             progress_arg, rl,
 723                             got_object_idset_num_elements(*loose_ids), -1, -1);
 724                         if (err)
 725                                 goto done;
 726                 }
 727
 728                 if (closedir(dir) != 0) {
 729                         err = got_error_from_errno("closedir");
 730                         goto done;
 731                 }
 732                 dir = NULL;
 733
 734                 free(path);
 735                 path = NULL;
 736         }
 737 done:
 738         if (dir && closedir(dir) != 0 && err == NULL)
 739                 err = got_error_from_errno("closedir");
 740         if (fd != -1 && close(fd) == -1 && err == NULL)
 741                 err = got_error_from_errno("close");
 742         if (err) {
 743                 got_object_idset_free(*loose_ids);
 744                 *loose_ids = NULL;
 745         }
 746         if (obj)
 747                 got_object_close(obj);
 748         free(path_objects);
 749         free(path);
 750         return err;
 751 }
 752
 753 static const struct got_error *
 754 preserve_loose_object(struct got_object_idset *loose_ids,
 755     struct got_object_id *id, struct got_repository *repo, int *npacked)
 756 {
 757         const struct got_error *err = NULL;
 758         struct got_object *obj;
 759
 760         if (!got_object_idset_contains(loose_ids, id))
 761                 return NULL;
 762
 763         /*
 764          * Try to open this object from a pack file. This ensures that
 765          * we do in fact have a valid packed copy of the object. Otherwise
 766          * we should not delete the loose representation of this object.
 767          */
 768         err = got_object_open_packed(&obj, id, repo);
 769         if (err == NULL) {
 770                 got_object_close(obj);
 771                 /*
 772                  * The object is referenced and packed.
 773                  * We can purge the redundantly stored loose object.
 774                  */
 775                 (*npacked)++;
 776                 return NULL;
 777         } else if (err->code != GOT_ERR_NO_OBJ)
 778                 return err;
 779
 780         /*
 781          * This object is referenced and not packed.
 782          * Remove it from our purge set.
 783          */
 784         return got_object_idset_remove(NULL, loose_ids, id);
 785 }
 786
 787 static const struct got_error *
 788 load_tree_entries(struct got_object_id_queue *ids,
 789     struct got_object_idset *loose_ids,
 790     struct got_object_idset *traversed_ids, struct got_object_id *tree_id,
 791     const char *dpath, struct got_repository *repo, int *npacked,
 792     got_cancel_cb cancel_cb, void *cancel_arg)
 793 {
 794         const struct got_error *err;
 795         struct got_tree_object *tree;
 796         char *p = NULL;
 797         int i;
 798
 799         err = got_object_open_as_tree(&tree, repo, tree_id);
 800         if (err)
 801                 return err;
 802
 803         for (i = 0; i < got_object_tree_get_nentries(tree); i++) {
 804                 struct got_tree_entry *e = got_object_tree_get_entry(tree, i);
 805                 struct got_object_id *id = got_tree_entry_get_id(e);
 806                 mode_t mode = got_tree_entry_get_mode(e);
 807
 808                 if (cancel_cb) {
 809                         err = (*cancel_cb)(cancel_arg);
 810                         if (err)
 811                                 break;
 812                 }
 813
 814                 if (got_object_tree_entry_is_symlink(e) ||
 815                     got_object_tree_entry_is_submodule(e) ||
 816                     got_object_idset_contains(traversed_ids, id))
 817                         continue;
 818
 819                 if (asprintf(&p, "%s%s%s", dpath, dpath[0] != '\0' ? "/" : "",
 820                     got_tree_entry_get_name(e)) == -1) {
 821                         err = got_error_from_errno("asprintf");
 822                         break;
 823                 }
 824
 825                 if (S_ISDIR(mode)) {
 826                         struct got_object_qid *qid;
 827                         err = got_object_qid_alloc(&qid, id);
 828                         if (err)
 829                                 break;
 830                         STAILQ_INSERT_TAIL(ids, qid, entry);
 831                 } else if (S_ISREG(mode)) {
 832                         /* This blob is referenced. */
 833                         err = preserve_loose_object(loose_ids, id, repo,
 834                             npacked);
 835                         if (err)
 836                                 break;
 837                         err = got_object_idset_add(traversed_ids, id, NULL);
 838                         if (err)
 839                                 break;
 840                 }
 841                 free(p);
 842                 p = NULL;
 843         }
 844
 845         got_object_tree_close(tree);
 846         free(p);
 847         return err;
 848 }
 849
 850 static const struct got_error *
 851 load_tree(struct got_object_idset *loose_ids,
 852     struct got_object_idset *traversed_ids, struct got_object_id *tree_id,
 853     const char *dpath, struct got_repository *repo, int *npacked,
 854     got_cancel_cb cancel_cb, void *cancel_arg)
 855 {
 856         const struct got_error *err = NULL;
 857         struct got_object_id_queue tree_ids;
 858         struct got_object_qid *qid;
 859
 860         err = got_object_qid_alloc(&qid, tree_id);
 861         if (err)
 862                 return err;
 863
 864         STAILQ_INIT(&tree_ids);
 865         STAILQ_INSERT_TAIL(&tree_ids, qid, entry);
 866
 867         while (!STAILQ_EMPTY(&tree_ids)) {
 868                 if (cancel_cb) {
 869                         err = (*cancel_cb)(cancel_arg);
 870                         if (err)
 871                                 break;
 872                 }
 873
 874                 qid = STAILQ_FIRST(&tree_ids);
 875                 STAILQ_REMOVE_HEAD(&tree_ids, entry);
 876
 877                 if (got_object_idset_contains(traversed_ids, &qid->id)) {
 878                         got_object_qid_free(qid);
 879                         continue;
 880                 }
 881
 882                 err = got_object_idset_add(traversed_ids, &qid->id, NULL);
 883                 if (err) {
 884                         got_object_qid_free(qid);
 885                         break;
 886                 }
 887
 888                 /* This tree is referenced. */
 889                 err = preserve_loose_object(loose_ids, &qid->id, repo, npacked);
 890                 if (err)
 891                         break;
 892
 893                 err = load_tree_entries(&tree_ids, loose_ids, traversed_ids,
 894                     &qid->id, dpath, repo, npacked, cancel_cb, cancel_arg);
 895                 got_object_qid_free(qid);
 896                 if (err)
 897                         break;
 898         }
 899
 900         got_object_id_queue_free(&tree_ids);
 901         return err;
 902 }
 903
 904 static const struct got_error *
 905 load_commit_or_tag(struct got_object_idset *loose_ids, int *ncommits,
 906     int *npacked, struct got_object_idset *traversed_ids,
 907     struct got_object_id *id, struct got_repository *repo,
 908     got_cleanup_progress_cb progress_cb, void *progress_arg,
 909     struct got_ratelimit *rl, int nloose,
 910     got_cancel_cb cancel_cb, void *cancel_arg)
 911 {
 912         const struct got_error *err;
 913         struct got_commit_object *commit = NULL;
 914         struct got_tag_object *tag = NULL;
 915         struct got_object_id *tree_id = NULL;
 916         struct got_object_id_queue ids;
 917         struct got_object_qid *qid;
 918         int obj_type;
 919
 920         err = got_object_qid_alloc(&qid, id);
 921         if (err)
 922                 return err;
 923
 924         STAILQ_INIT(&ids);
 925         STAILQ_INSERT_TAIL(&ids, qid, entry);
 926
 927         while (!STAILQ_EMPTY(&ids)) {
 928                 if (cancel_cb) {
 929                         err = (*cancel_cb)(cancel_arg);
 930                         if (err)
 931                                 break;
 932                 }
 933
 934                 qid = STAILQ_FIRST(&ids);
 935                 STAILQ_REMOVE_HEAD(&ids, entry);
 936
 937                 if (got_object_idset_contains(traversed_ids, &qid->id)) {
 938                         got_object_qid_free(qid);
 939                         qid = NULL;
 940                         continue;
 941                 }
 942
 943                 err = got_object_idset_add(traversed_ids, &qid->id, NULL);
 944                 if (err)
 945                         break;
 946
 947                 /* This commit or tag is referenced. */
 948                 err = preserve_loose_object(loose_ids, &qid->id, repo, npacked);
 949                 if (err)
 950                         break;
 951
 952                 err = got_object_get_type(&obj_type, repo, &qid->id);
 953                 if (err)
 954                         break;
 955                 switch (obj_type) {
 956                 case GOT_OBJ_TYPE_COMMIT:
 957                         err = got_object_open_as_commit(&commit, repo,
 958                             &qid->id);
 959                         if (err)
 960                                 goto done;
 961                         break;
 962                 case GOT_OBJ_TYPE_TAG:
 963                         err = got_object_open_as_tag(&tag, repo, &qid->id);
 964                         if (err)
 965                                 goto done;
 966                         break;
 967                 default:
 968                         /* should not happen */
 969                         err = got_error(GOT_ERR_OBJ_TYPE);
 970                         goto done;
 971                 }
 972
 973                 /* Find a tree object to scan. */
 974                 if (commit) {
 975                         tree_id = got_object_commit_get_tree_id(commit);
 976                 } else if (tag) {
 977                         obj_type = got_object_tag_get_object_type(tag);
 978                         switch (obj_type) {
 979                         case GOT_OBJ_TYPE_COMMIT:
 980                                 err = got_object_open_as_commit(&commit, repo,
 981                                     got_object_tag_get_object_id(tag));
 982                                 if (err)
 983                                         goto done;
 984                                 tree_id = got_object_commit_get_tree_id(commit);
 985                                 break;
 986                         case GOT_OBJ_TYPE_TREE:
 987                                 tree_id = got_object_tag_get_object_id(tag);
 988                                 break;
 989                         default:
 990                                 /*
 991                                  * Tag points at something other than a
 992                                  * commit or tree. Leave this weird tag object
 993                                  * and the object it points to on disk.
 994                                  */
 995                                 err = got_object_idset_remove(NULL, loose_ids,
 996                                     &qid->id);
 997                                 if (err && err->code != GOT_ERR_NO_OBJ)
 998                                         goto done;
 999                                 err = got_object_idset_remove(NULL, loose_ids,
1000                                     got_object_tag_get_object_id(tag));
1001                                 if (err && err->code != GOT_ERR_NO_OBJ)
1002                                         goto done;
1003                                 err = NULL;
1004                                 break;
1005                         }
1006                 }
1007
1008                 if (tree_id) {
1009                         err = load_tree(loose_ids, traversed_ids, tree_id, "",
1010                             repo, npacked, cancel_cb, cancel_arg);
1011                         if (err)
1012                                 break;
1013                 }
1014
1015                 if (commit || tag)
1016                         (*ncommits)++; /* scanned tags are counted as commits */
1017
1018                 err = report_cleanup_progress(progress_cb, progress_arg, rl,
1019                     nloose, *ncommits, -1);
1020                 if (err)
1021                         break;
1022
1023                 if (commit) {
1024                         /* Find parent commits to scan. */
1025                         const struct got_object_id_queue *parent_ids;
1026                         parent_ids = got_object_commit_get_parent_ids(commit);
1027                         err = got_object_id_queue_copy(parent_ids, &ids);
1028                         if (err)
1029                                 break;
1030                         got_object_commit_close(commit);
1031                         commit = NULL;
1032                 }
1033                 if (tag) {
1034                         got_object_tag_close(tag);
1035                         tag = NULL;
1036                 }
1037                 got_object_qid_free(qid);
1038                 qid = NULL;
1039         }
1040 done:
1041         if (qid)
1042                 got_object_qid_free(qid);
1043         if (commit)
1044                 got_object_commit_close(commit);
1045         if (tag)
1046                 got_object_tag_close(tag);
1047         got_object_id_queue_free(&ids);
1048         return err;
1049 }
1050
1051 struct purge_loose_object_arg {
1052         struct got_repository *repo;
1053         got_cleanup_progress_cb progress_cb;
1054         void *progress_arg;
1055         struct got_ratelimit *rl;
1056         int nloose;
1057         int ncommits;
1058         int npurged;
1059         off_t size_purged;
1060         int dry_run;
1061         time_t max_mtime;
1062         int ignore_mtime;
1063 };
1064
1065 static const struct got_error *
1066 purge_loose_object(struct got_object_id *id, void *data, void *arg)
1067 {
1068         struct purge_loose_object_arg *a = arg;
1069         const struct got_error *err, *unlock_err = NULL;
1070         char *path = NULL;
1071         int fd = -1;
1072         struct stat sb;
1073         struct got_lockfile *lf = NULL;
1074
1075         err = got_object_get_path(&path, id, a->repo);
1076         if (err)
1077                 return err;
1078
1079         err = got_object_open_loose_fd(&fd, id, a->repo);
1080         if (err)
1081                 goto done;
1082
1083         if (fstat(fd, &sb) == -1) {
1084                 err = got_error_from_errno("fstat");
1085                 goto done;
1086         }
1087
1088         /*
1089          * Do not delete objects which are younger than our maximum
1090          * modification time threshold. This prevents a race where
1091          * new objects which are being added to the repository
1092          * concurrently would be deleted.
1093          */
1094         if (a->ignore_mtime || sb.st_mtime <= a->max_mtime) {
1095                 if (!a->dry_run) {
1096                         err = got_lockfile_lock(&lf, path, -1);
1097                         if (err)
1098                                 goto done;
1099                         if (unlink(path) == -1) {
1100                                 err = got_error_from_errno2("unlink", path);
1101                                 goto done;
1102                         }
1103                 }
1104
1105                 a->npurged++;
1106                 a->size_purged += sb.st_size;
1107                 err = report_cleanup_progress(a->progress_cb, a->progress_arg,
1108                     a->rl, a->nloose, a->ncommits, a->npurged);
1109                 if (err)
1110                         goto done;
1111         }
1112 done:
1113         if (fd != -1 && close(fd) == -1 && err == NULL)
1114                 err = got_error_from_errno("close");
1115         free(path);
1116         if (lf)
1117                 unlock_err = got_lockfile_unlock(lf, -1);
1118         return err ? err : unlock_err;
1119 }
1120
1121 const struct got_error *
1122 got_repo_purge_unreferenced_loose_objects(struct got_repository *repo,
1123     off_t *size_before, off_t *size_after, int *npacked, int dry_run,
1124     int ignore_mtime, got_cleanup_progress_cb progress_cb, void *progress_arg,
1125     got_cancel_cb cancel_cb, void *cancel_arg)
1126 {
1127         const struct got_error *err;
1128         struct got_object_idset *loose_ids;
1129         struct got_object_idset *traversed_ids;
1130         struct got_object_id **referenced_ids;
1131         int i, nreferenced, nloose, ncommits = 0;
1132         struct got_reflist_head refs;
1133         struct got_reflist_entry *re;
1134         struct purge_loose_object_arg arg;
1135         time_t max_mtime = 0;
1136         struct got_ratelimit rl;
1137
1138         TAILQ_INIT(&refs);
1139         got_ratelimit_init(&rl, 0, 500);
1140
1141         *size_before = 0;
1142         *size_after = 0;
1143         *npacked = 0;
1144
1145         err = get_loose_object_ids(&loose_ids, size_before,
1146             progress_cb, progress_arg, &rl, repo);
1147         if (err)
1148                 return err;
1149         nloose = got_object_idset_num_elements(loose_ids);
1150         if (nloose == 0) {
1151                 got_object_idset_free(loose_ids);
1152                 if (progress_cb) {
1153                         err = progress_cb(progress_arg, 0, 0, 0);
1154                         if (err)
1155                                 return err;
1156                 }
1157                 return NULL;
1158         }
1159
1160         traversed_ids = got_object_idset_alloc();
1161         if (traversed_ids == NULL) {
1162                 err = got_error_from_errno("got_object_idset_alloc");
1163                 goto done;
1164         }
1165
1166         err = got_ref_list(&refs, repo, "", got_ref_cmp_by_name, NULL);
1167         if (err)
1168                 goto done;
1169         if (!ignore_mtime) {
1170                 TAILQ_FOREACH(re, &refs, entry) {
1171                         time_t mtime = got_ref_get_mtime(re->ref);
1172                         if (mtime > max_mtime)
1173                                 max_mtime = mtime;
1174                 }
1175                 /*
1176                  * For safety, keep objects created within 10 minutes
1177                  * before the youngest reference was created.
1178                  */
1179                 if (max_mtime >= 600)
1180                         max_mtime -= 600;
1181         }
1182
1183         err = get_reflist_object_ids(&referenced_ids, &nreferenced,
1184             (1 << GOT_OBJ_TYPE_COMMIT) | (1 << GOT_OBJ_TYPE_TAG),
1185             &refs, repo, cancel_cb, cancel_arg);
1186         if (err)
1187                 goto done;
1188
1189         for (i = 0; i < nreferenced; i++) {
1190                 struct got_object_id *id = referenced_ids[i];
1191                 err = load_commit_or_tag(loose_ids, &ncommits, npacked,
1192                     traversed_ids, id, repo, progress_cb, progress_arg, &rl,
1193                     nloose, cancel_cb, cancel_arg);
1194                 if (err)
1195                         goto done;
1196         }
1197
1198         /* Any remaining loose objects are unreferenced and can be purged. */
1199         arg.repo = repo;
1200         arg.progress_arg = progress_arg;
1201         arg.progress_cb = progress_cb;
1202         arg.rl = &rl;
1203         arg.nloose = nloose;
1204         arg.npurged = 0;
1205         arg.size_purged = 0;
1206         arg.ncommits = ncommits;
1207         arg.dry_run = dry_run;
1208         arg.max_mtime = max_mtime;
1209         arg.ignore_mtime = ignore_mtime;
1210         err = got_object_idset_for_each(loose_ids, purge_loose_object, &arg);
1211         if (err)
1212                 goto done;
1213         *size_after = *size_before - arg.size_purged;
1214
1215         /* Produce a final progress report. */
1216         if (progress_cb) {
1217                 err = progress_cb(progress_arg, nloose, ncommits, arg.npurged);
1218                 if (err)
1219                         goto done;
1220         }
1221 done:
1222         got_object_idset_free(loose_ids);
1223         got_object_idset_free(traversed_ids);
1224         return err;
1225 }
1226
1227 static const struct got_error *
1228 remove_packidx(int dir_fd, const char *relpath)
1229 {
1230         const struct got_error *err, *unlock_err;
1231         struct got_lockfile *lf;
1232
1233         err = got_lockfile_lock(&lf, relpath, dir_fd);
1234         if (err)
1235                 return err;
1236         if (unlinkat(dir_fd, relpath, 0) == -1)
1237                 err = got_error_from_errno("unlinkat");
1238         unlock_err = got_lockfile_unlock(lf, dir_fd);
1239         return err ? err : unlock_err;
1240 }
1241
1242 const struct got_error *
1243 got_repo_remove_lonely_packidx(struct got_repository *repo, int dry_run,
1244     got_lonely_packidx_progress_cb progress_cb, void *progress_arg,
1245     got_cancel_cb cancel_cb, void *cancel_arg)
1246 {
1247         const struct got_error *err = NULL;
1248         DIR *packdir = NULL;
1249         struct dirent *dent;
1250         char *pack_relpath = NULL;
1251         int packdir_fd;
1252         struct stat sb;
1253
1254         packdir_fd = openat(got_repo_get_fd(repo),
1255             GOT_OBJECTS_PACK_DIR, O_DIRECTORY | O_CLOEXEC);
1256         if (packdir_fd == -1) {
1257                 if (errno == ENOENT)
1258                         return NULL;
1259                 return got_error_from_errno_fmt("openat: %s/%s",
1260                     got_repo_get_path_git_dir(repo),
1261                     GOT_OBJECTS_PACK_DIR);
1262         }
1263
1264         packdir = fdopendir(packdir_fd);
1265         if (packdir == NULL) {
1266                 err = got_error_from_errno("fdopendir");
1267                 goto done;
1268         }
1269
1270         while ((dent = readdir(packdir)) != NULL) {
1271                 if (cancel_cb) {
1272                         err = cancel_cb(cancel_arg);
1273                         if (err)
1274                                 goto done;
1275                 }
1276
1277                 if (!got_repo_is_packidx_filename(dent->d_name,
1278                     strlen(dent->d_name)))
1279                         continue;
1280
1281                 err = got_packidx_get_packfile_path(&pack_relpath,
1282                     dent->d_name);
1283                 if (err)
1284                         goto done;
1285
1286                 if (fstatat(packdir_fd, pack_relpath, &sb, 0) != -1) {
1287                         free(pack_relpath);
1288                         pack_relpath = NULL;
1289                         continue;
1290                 }
1291                 if (errno != ENOENT) {
1292                         err = got_error_from_errno_fmt("fstatat: %s/%s/%s",
1293                             got_repo_get_path_git_dir(repo),
1294                             GOT_OBJECTS_PACK_DIR,
1295                             pack_relpath);
1296                         goto done;
1297                 }
1298
1299                 if (!dry_run) {
1300                         err = remove_packidx(packdir_fd, dent->d_name);
1301                         if (err)
1302                                 goto done;
1303                 }
1304                 if (progress_cb) {
1305                         char *path;
1306                         if (asprintf(&path, "%s/%s/%s",
1307                             got_repo_get_path_git_dir(repo),
1308                             GOT_OBJECTS_PACK_DIR,
1309                             dent->d_name) == -1) {
1310                                 err = got_error_from_errno("asprintf");
1311                                 goto done;
1312                         }
1313                         err = progress_cb(progress_arg, path);
1314                         free(path);
1315                         if (err)
1316                                 goto done;
1317                 }
1318                 free(pack_relpath);
1319                 pack_relpath = NULL;
1320         }
1321 done:
1322         if (packdir && closedir(packdir) != 0 && err == NULL)
1323                 err = got_error_from_errno("closedir");
1324         free(pack_relpath);
1325         return err;
1326 }