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