lib/fetch.c

   1 /*
   2  * Copyright (c) 2018, 2019 Ori Bernstein <ori@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 <sys/types.h>
  18 #include <sys/stat.h>
  19 #include <sys/queue.h>
  20 #include <sys/tree.h>
  21 #include <sys/uio.h>
  22 #include <sys/socket.h>
  23 #include <sys/wait.h>
  24 #include <sys/resource.h>
  25 #include <sys/socket.h>
  26
  27 #include <errno.h>
  28 #include <err.h>
  29 #include <fcntl.h>
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <stdint.h>
  34 #include <unistd.h>
  35 #include <zlib.h>
  36 #include <ctype.h>
  37 #include <limits.h>
  38 #include <time.h>
  39 #include <uuid.h>
  40
  41 #include "got_error.h"
  42 #include "got_reference.h"
  43 #include "got_repository.h"
  44 #include "got_path.h"
  45 #include "got_cancel.h"
  46 #include "got_worktree.h"
  47 #include "got_object.h"
  48 #include "got_opentemp.h"
  49 #include "got_fetch.h"
  50
  51 #include "got_lib_delta.h"
  52 #include "got_lib_inflate.h"
  53 #include "got_lib_object.h"
  54 #include "got_lib_object_parse.h"
  55 #include "got_lib_object_create.h"
  56 #include "got_lib_pack.h"
  57 #include "got_lib_sha1.h"
  58 #include "got_lib_privsep.h"
  59 #include "got_lib_object_cache.h"
  60 #include "got_lib_repository.h"
  61 #include "got_lib_dial.h"
  62 #include "got_lib_pkt.h"
  63
  64 #ifndef nitems
  65 #define nitems(_a)      (sizeof((_a)) / sizeof((_a)[0]))
  66 #endif
  67
  68 #ifndef ssizeof
  69 #define ssizeof(_x) ((ssize_t)(sizeof(_x)))
  70 #endif
  71
  72 #ifndef MIN
  73 #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
  74 #endif
  75
  76 const struct got_error *
  77 got_fetch_connect(pid_t *fetchpid, int *fetchfd, const char *proto,
  78     const char *host, const char *port, const char *server_path, int verbosity)
  79 {
  80         const struct got_error *err = NULL;
  81
  82         *fetchpid = -1;
  83         *fetchfd = -1;
  84
  85         if (strcmp(proto, "ssh") == 0 || strcmp(proto, "git+ssh") == 0)
  86                 err = got_dial_ssh(fetchpid, fetchfd, host, port,
  87                     server_path, GOT_DIAL_DIRECTION_FETCH, verbosity);
  88         else if (strcmp(proto, "git") == 0)
  89                 err = got_dial_git(fetchfd, host, port, server_path,
  90                     GOT_DIAL_DIRECTION_FETCH);
  91         else if (strcmp(proto, "http") == 0 || strcmp(proto, "git+http") == 0)
  92                 err = got_error_path(proto, GOT_ERR_NOT_IMPL);
  93         else
  94                 err = got_error_path(proto, GOT_ERR_BAD_PROTO);
  95         return err;
  96 }
  97
  98 const struct got_error*
  99 got_fetch_pack(struct got_object_id **pack_hash, struct got_pathlist_head *refs,
 100     struct got_pathlist_head *symrefs, const char *remote_name,
 101     int mirror_references, int fetch_all_branches,
 102     struct got_pathlist_head *wanted_branches,
 103     struct got_pathlist_head *wanted_refs, int list_refs_only, int verbosity,
 104     int fetchfd, struct got_repository *repo,
 105     got_fetch_progress_cb progress_cb, void *progress_arg)
 106 {
 107         size_t i;
 108         int imsg_fetchfds[2], imsg_idxfds[2];
 109         int packfd = -1, npackfd = -1, idxfd = -1, nidxfd = -1, nfetchfd = -1;
 110         int tmpfds[3];
 111         int fetchstatus, idxstatus, done = 0;
 112         const struct got_error *err;
 113         struct imsgbuf fetchibuf, idxibuf;
 114         pid_t fetchpid, idxpid;
 115         char *tmppackpath = NULL, *tmpidxpath = NULL;
 116         char *packpath = NULL, *idxpath = NULL, *id_str = NULL;
 117         const char *repo_path = NULL;
 118         struct got_pathlist_head have_refs;
 119         struct got_pathlist_entry *pe;
 120         struct got_reflist_head my_refs;
 121         struct got_reflist_entry *re;
 122         off_t packfile_size = 0;
 123         struct got_packfile_hdr pack_hdr;
 124         uint32_t nobj = 0;
 125         char *path;
 126         char *progress = NULL;
 127
 128         *pack_hash = NULL;
 129
 130         /*
 131          * Prevent fetching of references that won't make any
 132          * sense outside of the remote repository's context.
 133          */
 134         TAILQ_FOREACH(pe, wanted_refs, entry) {
 135                 const char *refname = pe->path;
 136                 if (strncmp(refname, "refs/got/", 9) == 0 ||
 137                     strncmp(refname, "got/", 4) == 0 ||
 138                     strncmp(refname, "refs/remotes/", 13) == 0 ||
 139                     strncmp(refname, "remotes/", 8) == 0)
 140                         return got_error_path(refname, GOT_ERR_FETCH_BAD_REF);
 141         }
 142
 143         if (!list_refs_only)
 144                 repo_path = got_repo_get_path_git_dir(repo);
 145
 146         for (i = 0; i < nitems(tmpfds); i++)
 147                 tmpfds[i] = -1;
 148
 149         TAILQ_INIT(&have_refs);
 150         TAILQ_INIT(&my_refs);
 151
 152         if (!list_refs_only) {
 153                 err = got_ref_list(&my_refs, repo, NULL,
 154                     got_ref_cmp_by_name, NULL);
 155                 if (err)
 156                         goto done;
 157         }
 158
 159         TAILQ_FOREACH(re, &my_refs, entry) {
 160                 struct got_object_id *id;
 161                 const char *refname;
 162
 163                 if (got_ref_is_symbolic(re->ref))
 164                         continue;
 165
 166                 err = got_ref_resolve(&id, repo, re->ref);
 167                 if (err)
 168                         goto done;
 169                 refname = strdup(got_ref_get_name(re->ref));
 170                 if (refname == NULL) {
 171                         err = got_error_from_errno("strdup");
 172                         goto done;
 173                 }
 174                 err = got_pathlist_append(&have_refs, refname, id);
 175                 if (err)
 176                         goto done;
 177         }
 178
 179         if (list_refs_only) {
 180                 packfd = got_opentempfd();
 181                 if (packfd == -1) {
 182                         err = got_error_from_errno("got_opentempfd");
 183                         goto done;
 184                 }
 185         } else {
 186                 if (asprintf(&path, "%s/%s/fetching.pack",
 187                     repo_path, GOT_OBJECTS_PACK_DIR) == -1) {
 188                         err = got_error_from_errno("asprintf");
 189                         goto done;
 190                 }
 191                 err = got_opentemp_named_fd(&tmppackpath, &packfd, path);
 192                 free(path);
 193                 if (err)
 194                         goto done;
 195                 if (fchmod(packfd, GOT_DEFAULT_FILE_MODE) != 0) {
 196                         err = got_error_from_errno2("fchmod", tmppackpath);
 197                         goto done;
 198                 }
 199         }
 200         if (list_refs_only) {
 201                 idxfd = got_opentempfd();
 202                 if (idxfd == -1) {
 203                         err = got_error_from_errno("got_opentempfd");
 204                         goto done;
 205                 }
 206         } else {
 207                 if (asprintf(&path, "%s/%s/fetching.idx",
 208                     repo_path, GOT_OBJECTS_PACK_DIR) == -1) {
 209                         err = got_error_from_errno("asprintf");
 210                         goto done;
 211                 }
 212                 err = got_opentemp_named_fd(&tmpidxpath, &idxfd, path);
 213                 free(path);
 214                 if (err)
 215                         goto done;
 216                 if (fchmod(idxfd, GOT_DEFAULT_FILE_MODE) != 0) {
 217                         err = got_error_from_errno2("fchmod", tmpidxpath);
 218                         goto done;
 219                 }
 220         }
 221         nidxfd = dup(idxfd);
 222         if (nidxfd == -1) {
 223                 err = got_error_from_errno("dup");
 224                 goto done;
 225         }
 226
 227         for (i = 0; i < nitems(tmpfds); i++) {
 228                 tmpfds[i] = got_opentempfd();
 229                 if (tmpfds[i] == -1) {
 230                         err = got_error_from_errno("got_opentempfd");
 231                         goto done;
 232                 }
 233         }
 234
 235         if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fetchfds) == -1) {
 236                 err = got_error_from_errno("socketpair");
 237                 goto done;
 238         }
 239
 240         fetchpid = fork();
 241         if (fetchpid == -1) {
 242                 err = got_error_from_errno("fork");
 243                 goto done;
 244         } else if (fetchpid == 0){
 245                 got_privsep_exec_child(imsg_fetchfds,
 246                     GOT_PATH_PROG_FETCH_PACK, tmppackpath);
 247         }
 248
 249         if (close(imsg_fetchfds[1]) == -1) {
 250                 err = got_error_from_errno("close");
 251                 goto done;
 252         }
 253         imsg_init(&fetchibuf, imsg_fetchfds[0]);
 254         nfetchfd = dup(fetchfd);
 255         if (nfetchfd == -1) {
 256                 err = got_error_from_errno("dup");
 257                 goto done;
 258         }
 259         err = got_privsep_send_fetch_req(&fetchibuf, nfetchfd, &have_refs,
 260             fetch_all_branches, wanted_branches, wanted_refs,
 261             list_refs_only, verbosity);
 262         if (err != NULL)
 263                 goto done;
 264         nfetchfd = -1;
 265         npackfd = dup(packfd);
 266         if (npackfd == -1) {
 267                 err = got_error_from_errno("dup");
 268                 goto done;
 269         }
 270         err = got_privsep_send_fetch_outfd(&fetchibuf, npackfd);
 271         if (err != NULL)
 272                 goto done;
 273         npackfd = -1;
 274
 275         packfile_size = 0;
 276         progress = calloc(GOT_PKT_MAX, 1);
 277         if (progress == NULL) {
 278                 err = got_error_from_errno("calloc");
 279                 goto done;
 280         }
 281
 282         *pack_hash = calloc(1, sizeof(**pack_hash));
 283         if (*pack_hash == NULL) {
 284                 err = got_error_from_errno("calloc");
 285                 goto done;
 286         }
 287
 288         while (!done) {
 289                 struct got_object_id *id = NULL;
 290                 char *refname = NULL;
 291                 char *server_progress = NULL;
 292                 off_t packfile_size_cur = 0;
 293
 294                 err = got_privsep_recv_fetch_progress(&done,
 295                     &id, &refname, symrefs, &server_progress,
 296                     &packfile_size_cur, (*pack_hash)->sha1, &fetchibuf);
 297                 if (err != NULL)
 298                         goto done;
 299                 /* Don't report size progress for an empty pack file. */
 300                 if (packfile_size_cur <= ssizeof(pack_hdr) + SHA1_DIGEST_LENGTH)
 301                         packfile_size_cur = 0;
 302                 if (!done && refname && id) {
 303                         err = got_pathlist_insert(NULL, refs, refname, id);
 304                         if (err)
 305                                 goto done;
 306                 } else if (!done && server_progress) {
 307                         char *p;
 308                         /*
 309                          * XXX git-daemon tends to send batched output with
 310                          * lines spanning separate packets. Buffer progress
 311                          * output until we see a CR or LF to avoid giving
 312                          * partial lines of progress output to the callback.
 313                          */
 314                         if (strlcat(progress, server_progress,
 315                             GOT_PKT_MAX) >= GOT_PKT_MAX) {
 316                                 progress[0] = '\0'; /* discard */
 317                                 continue;
 318                         }
 319                         while ((p = strchr(progress, '\r')) != NULL ||
 320                             (p = strchr(progress, '\n')) != NULL) {
 321                                 char *s;
 322                                 size_t n;
 323                                 char c = *p;
 324                                 *p = '\0';
 325                                 if (asprintf(&s, "%s%s", progress,
 326                                     c == '\n' ? "\n" : "") == -1) {
 327                                         err = got_error_from_errno("asprintf");
 328                                         goto done;
 329                                 }
 330                                 err = progress_cb(progress_arg, s,
 331                                     packfile_size_cur, 0, 0, 0, 0);
 332                                 free(s);
 333                                 if (err)
 334                                         break;
 335                                 n = strlen(progress);
 336                                 if (n < GOT_PKT_MAX - 1) {
 337                                         memmove(progress, &progress[n + 1],
 338                                             GOT_PKT_MAX - n - 1);
 339                                 } else
 340                                         progress[0] = '\0';
 341                         }
 342                         free(server_progress);
 343                         if (err)
 344                                 goto done;
 345                 } else if (!done && packfile_size_cur != packfile_size) {
 346                         err = progress_cb(progress_arg, NULL,
 347                             packfile_size_cur, 0, 0, 0, 0);
 348                         if (err)
 349                                 break;
 350                         packfile_size = packfile_size_cur;
 351                 }
 352         }
 353         if (waitpid(fetchpid, &fetchstatus, 0) == -1) {
 354                 err = got_error_from_errno("waitpid");
 355                 goto done;
 356         }
 357
 358         if (lseek(packfd, 0, SEEK_SET) == -1) {
 359                 err = got_error_from_errno("lseek");
 360                 goto done;
 361         }
 362
 363         /* If zero data was fetched without error we are already up-to-date. */
 364         if (packfile_size == 0) {
 365                 free(*pack_hash);
 366                 *pack_hash = NULL;
 367                 goto done;
 368         } else if (packfile_size < ssizeof(pack_hdr) + SHA1_DIGEST_LENGTH) {
 369                 err = got_error_msg(GOT_ERR_BAD_PACKFILE, "short pack file");
 370                 goto done;
 371         } else {
 372                 ssize_t n;
 373
 374                 n = read(packfd, &pack_hdr, ssizeof(pack_hdr));
 375                 if (n == -1) {
 376                         err = got_error_from_errno("read");
 377                         goto done;
 378                 }
 379                 if (n != ssizeof(pack_hdr)) {
 380                         err = got_error(GOT_ERR_IO);
 381                         goto done;
 382                 }
 383                 if (pack_hdr.signature != htobe32(GOT_PACKFILE_SIGNATURE)) {
 384                         err = got_error_msg(GOT_ERR_BAD_PACKFILE,
 385                             "bad pack file signature");
 386                         goto done;
 387                 }
 388                 if (pack_hdr.version != htobe32(GOT_PACKFILE_VERSION)) {
 389                         err = got_error_msg(GOT_ERR_BAD_PACKFILE,
 390                             "bad pack file version");
 391                         goto done;
 392                 }
 393                 nobj = be32toh(pack_hdr.nobjects);
 394                 if (nobj == 0 &&
 395                     packfile_size > ssizeof(pack_hdr) + SHA1_DIGEST_LENGTH)
 396                         return got_error_msg(GOT_ERR_BAD_PACKFILE,
 397                             "bad pack file with zero objects");
 398                 if (nobj != 0 &&
 399                     packfile_size <= ssizeof(pack_hdr) + SHA1_DIGEST_LENGTH)
 400                         return got_error_msg(GOT_ERR_BAD_PACKFILE,
 401                             "empty pack file with non-zero object count");
 402         }
 403
 404         /*
 405          * If the pack file contains no objects, we may only need to update
 406          * references in our repository. The caller will take care of that.
 407          */
 408         if (nobj == 0) {
 409                 free(*pack_hash);
 410                 *pack_hash = NULL;
 411                 goto done;
 412         }
 413
 414         if (lseek(packfd, 0, SEEK_SET) == -1) {
 415                 err = got_error_from_errno("lseek");
 416                 goto done;
 417         }
 418
 419         if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_idxfds) == -1) {
 420                 err = got_error_from_errno("socketpair");
 421                 goto done;
 422         }
 423         idxpid = fork();
 424         if (idxpid == -1) {
 425                 err= got_error_from_errno("fork");
 426                 goto done;
 427         } else if (idxpid == 0)
 428                 got_privsep_exec_child(imsg_idxfds,
 429                     GOT_PATH_PROG_INDEX_PACK, tmppackpath);
 430         if (close(imsg_idxfds[1]) == -1) {
 431                 err = got_error_from_errno("close");
 432                 goto done;
 433         }
 434         imsg_init(&idxibuf, imsg_idxfds[0]);
 435
 436         npackfd = dup(packfd);
 437         if (npackfd == -1) {
 438                 err = got_error_from_errno("dup");
 439                 goto done;
 440         }
 441         err = got_privsep_send_index_pack_req(&idxibuf, (*pack_hash)->sha1,
 442             npackfd);
 443         if (err != NULL)
 444                 goto done;
 445         npackfd = -1;
 446         err = got_privsep_send_index_pack_outfd(&idxibuf, nidxfd);
 447         if (err != NULL)
 448                 goto done;
 449         nidxfd = -1;
 450         for (i = 0; i < nitems(tmpfds); i++) {
 451                 err = got_privsep_send_tmpfd(&idxibuf, tmpfds[i]);
 452                 if (err != NULL)
 453                         goto done;
 454                 tmpfds[i] = -1;
 455         }
 456         done = 0;
 457         while (!done) {
 458                 int nobj_total, nobj_indexed, nobj_loose, nobj_resolved;
 459
 460                 err = got_privsep_recv_index_progress(&done, &nobj_total,
 461                     &nobj_indexed, &nobj_loose, &nobj_resolved,
 462                     &idxibuf);
 463                 if (err != NULL)
 464                         goto done;
 465                 if (nobj_indexed != 0) {
 466                         err = progress_cb(progress_arg, NULL,
 467                             packfile_size, nobj_total,
 468                             nobj_indexed, nobj_loose, nobj_resolved);
 469                         if (err)
 470                                 break;
 471                 }
 472                 imsg_clear(&idxibuf);
 473         }
 474         if (close(imsg_idxfds[0]) == -1) {
 475                 err = got_error_from_errno("close");
 476                 goto done;
 477         }
 478         if (waitpid(idxpid, &idxstatus, 0) == -1) {
 479                 err = got_error_from_errno("waitpid");
 480                 goto done;
 481         }
 482
 483         err = got_object_id_str(&id_str, *pack_hash);
 484         if (err)
 485                 goto done;
 486         if (asprintf(&packpath, "%s/%s/pack-%s.pack",
 487             repo_path, GOT_OBJECTS_PACK_DIR, id_str) == -1) {
 488                 err = got_error_from_errno("asprintf");
 489                 goto done;
 490         }
 491
 492         if (asprintf(&idxpath, "%s/%s/pack-%s.idx",
 493             repo_path, GOT_OBJECTS_PACK_DIR, id_str) == -1) {
 494                 err = got_error_from_errno("asprintf");
 495                 goto done;
 496         }
 497
 498         if (rename(tmppackpath, packpath) == -1) {
 499                 err = got_error_from_errno3("rename", tmppackpath, packpath);
 500                 goto done;
 501         }
 502         free(tmppackpath);
 503         tmppackpath = NULL;
 504         if (rename(tmpidxpath, idxpath) == -1) {
 505                 err = got_error_from_errno3("rename", tmpidxpath, idxpath);
 506                 goto done;
 507         }
 508         free(tmpidxpath);
 509         tmpidxpath = NULL;
 510
 511 done:
 512         if (tmppackpath && unlink(tmppackpath) == -1 && err == NULL)
 513                 err = got_error_from_errno2("unlink", tmppackpath);
 514         if (tmpidxpath && unlink(tmpidxpath) == -1 && err == NULL)
 515                 err = got_error_from_errno2("unlink", tmpidxpath);
 516         if (nfetchfd != -1 && close(nfetchfd) == -1 && err == NULL)
 517                 err = got_error_from_errno("close");
 518         if (npackfd != -1 && close(npackfd) == -1 && err == NULL)
 519                 err = got_error_from_errno("close");
 520         if (packfd != -1 && close(packfd) == -1 && err == NULL)
 521                 err = got_error_from_errno("close");
 522         if (idxfd != -1 && close(idxfd) == -1 && err == NULL)
 523                 err = got_error_from_errno("close");
 524         for (i = 0; i < nitems(tmpfds); i++) {
 525                 if (tmpfds[i] != -1 && close(tmpfds[i]) == -1 && err == NULL)
 526                         err = got_error_from_errno("close");
 527         }
 528         free(tmppackpath);
 529         free(tmpidxpath);
 530         free(idxpath);
 531         free(packpath);
 532         free(progress);
 533
 534         TAILQ_FOREACH(pe, &have_refs, entry) {
 535                 free((char *)pe->path);
 536                 free(pe->data);
 537         }
 538         got_pathlist_free(&have_refs);
 539         got_ref_list_free(&my_refs);
 540         if (err) {
 541                 free(*pack_hash);
 542                 *pack_hash = NULL;
 543                 TAILQ_FOREACH(pe, refs, entry) {
 544                         free((void *)pe->path);
 545                         free(pe->data);
 546                 }
 547                 got_pathlist_free(refs);
 548                 TAILQ_FOREACH(pe, symrefs, entry) {
 549                         free((void *)pe->path);
 550                         free(pe->data);
 551                 }
 552                 got_pathlist_free(symrefs);
 553         }
 554         return err;
 555 }