gotd/repo_read.c

   1 /*
   2  * Copyright (c) 2022 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 <sys/queue.h>
  18 #include <sys/types.h>
  19
  20 #include <event.h>
  21 #include <errno.h>
  22 #include <imsg.h>
  23 #include <signal.h>
  24 #include <stdlib.h>
  25 #include <limits.h>
  26 #include <poll.h>
  27 #include <siphash.h>
  28 #include <stdio.h>
  29 #include <string.h>
  30 #include <unistd.h>
  31
  32 #include "got_error.h"
  33 #include "got_cancel.h"
  34 #include "got_object.h"
  35 #include "got_repository.h"
  36 #include "got_reference.h"
  37 #include "got_repository_admin.h"
  38 #include "got_path.h"
  39
  40 #include "got_lib_delta.h"
  41 #include "got_lib_object.h"
  42 #include "got_lib_object_idset.h"
  43 #include "got_lib_hash.h"
  44 #include "got_lib_pack.h"
  45 #include "got_lib_ratelimit.h"
  46 #include "got_lib_pack_create.h"
  47 #include "got_lib_poll.h"
  48
  49 #include "log.h"
  50 #include "gotd.h"
  51 #include "repo_read.h"
  52
  53 #ifndef nitems
  54 #define nitems(_a)      (sizeof((_a)) / sizeof((_a)[0]))
  55 #endif
  56
  57 static struct repo_read {
  58         pid_t pid;
  59         const char *title;
  60         struct got_repository *repo;
  61         int *pack_fds;
  62         int *temp_fds;
  63         int session_fd;
  64         struct gotd_imsgev session_iev;
  65 } repo_read;
  66
  67 static struct repo_read_client {
  68         uint32_t                         id;
  69         int                              fd;
  70         int                              delta_cache_fd;
  71         int                              report_progress;
  72         int                              pack_pipe;
  73         struct got_object_idset         *want_ids;
  74         struct got_object_idset         *have_ids;
  75 } repo_read_client;
  76
  77 static volatile sig_atomic_t sigint_received;
  78 static volatile sig_atomic_t sigterm_received;
  79
  80 static void
  81 catch_sigint(int signo)
  82 {
  83         sigint_received = 1;
  84 }
  85
  86 static void
  87 catch_sigterm(int signo)
  88 {
  89         sigterm_received = 1;
  90 }
  91
  92 static const struct got_error *
  93 check_cancelled(void *arg)
  94 {
  95         if (sigint_received || sigterm_received)
  96                 return got_error(GOT_ERR_CANCELLED);
  97
  98         return NULL;
  99 }
 100
 101 static const struct got_error *
 102 send_symref(struct got_reference *symref, struct got_object_id *target_id,
 103     struct imsgbuf *ibuf)
 104 {
 105         const struct got_error *err = NULL;
 106         struct gotd_imsg_symref isymref;
 107         const char *refname = got_ref_get_name(symref);
 108         const char *target = got_ref_get_symref_target(symref);
 109         size_t len;
 110         struct ibuf *wbuf;
 111
 112         memset(&isymref, 0, sizeof(isymref));
 113         isymref.name_len = strlen(refname);
 114         isymref.target_len = strlen(target);
 115         memcpy(isymref.target_id, target_id->sha1, sizeof(isymref.target_id));
 116
 117         len = sizeof(isymref) + isymref.name_len + isymref.target_len;
 118         if (len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
 119                 err = got_error(GOT_ERR_NO_SPACE);
 120                 goto done;
 121         }
 122
 123         wbuf = imsg_create(ibuf, GOTD_IMSG_SYMREF, 0, 0, len);
 124         if (wbuf == NULL) {
 125                 err = got_error_from_errno("imsg_create SYMREF");
 126                 goto done;
 127         }
 128
 129         if (imsg_add(wbuf, &isymref, sizeof(isymref)) == -1) {
 130                 err = got_error_from_errno("imsg_add SYMREF");
 131                 goto done;
 132         }
 133         if (imsg_add(wbuf, refname, isymref.name_len) == -1) {
 134                 err = got_error_from_errno("imsg_add SYMREF");
 135                 goto done;
 136         }
 137         if (imsg_add(wbuf, target, isymref.target_len) == -1) {
 138                 err = got_error_from_errno("imsg_add SYMREF");
 139                 goto done;
 140         }
 141
 142         wbuf->fd = -1;
 143         imsg_close(ibuf, wbuf);
 144 done:
 145         free(target_id);
 146         return err;
 147 }
 148
 149 static const struct got_error *
 150 send_peeled_tag_ref(struct got_reference *ref, struct got_object *obj,
 151     struct imsgbuf *ibuf)
 152 {
 153         const struct got_error *err = NULL;
 154         struct got_tag_object *tag;
 155         size_t namelen, len;
 156         char *peeled_refname = NULL;
 157         struct got_object_id *id;
 158         struct ibuf *wbuf;
 159
 160         err = got_object_tag_open(&tag, repo_read.repo, obj);
 161         if (err)
 162                 return err;
 163
 164         if (asprintf(&peeled_refname, "%s^{}", got_ref_get_name(ref)) == -1) {
 165                 err = got_error_from_errno("asprintf");
 166                 goto done;
 167         }
 168
 169         id = got_object_tag_get_object_id(tag);
 170         namelen = strlen(peeled_refname);
 171
 172         len = sizeof(struct gotd_imsg_ref) + namelen;
 173         if (len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
 174                 err = got_error(GOT_ERR_NO_SPACE);
 175                 goto done;
 176         }
 177
 178         wbuf = imsg_create(ibuf, GOTD_IMSG_REF, PROC_REPO_READ,
 179             repo_read.pid, len);
 180         if (wbuf == NULL) {
 181                 err = got_error_from_errno("imsg_create MREF");
 182                 goto done;
 183         }
 184
 185         /* Keep in sync with struct gotd_imsg_ref definition. */
 186         if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1) {
 187                 err = got_error_from_errno("imsg_add REF");
 188                 goto done;
 189         }
 190         if (imsg_add(wbuf, &namelen, sizeof(namelen)) == -1) {
 191                 err = got_error_from_errno("imsg_add REF");
 192                 goto done;
 193         }
 194         if (imsg_add(wbuf, peeled_refname, namelen) == -1) {
 195                 err = got_error_from_errno("imsg_add REF");
 196                 goto done;
 197         }
 198
 199         wbuf->fd = -1;
 200         imsg_close(ibuf, wbuf);
 201 done:
 202         got_object_tag_close(tag);
 203         return err;
 204 }
 205
 206 static const struct got_error *
 207 send_ref(struct got_reference *ref, struct imsgbuf *ibuf)
 208 {
 209         const struct got_error *err;
 210         const char *refname = got_ref_get_name(ref);
 211         size_t namelen;
 212         struct got_object_id *id = NULL;
 213         struct got_object *obj = NULL;
 214         size_t len;
 215         struct ibuf *wbuf;
 216
 217         namelen = strlen(refname);
 218
 219         len = sizeof(struct gotd_imsg_ref) + namelen;
 220         if (len > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
 221                 return got_error(GOT_ERR_NO_SPACE);
 222
 223         err = got_ref_resolve(&id, repo_read.repo, ref);
 224         if (err)
 225                 return err;
 226
 227         wbuf = imsg_create(ibuf, GOTD_IMSG_REF, PROC_REPO_READ,
 228             repo_read.pid, len);
 229         if (wbuf == NULL) {
 230                 err = got_error_from_errno("imsg_create REF");
 231                 goto done;
 232         }
 233
 234         /* Keep in sync with struct gotd_imsg_ref definition. */
 235         if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1)
 236                 return got_error_from_errno("imsg_add REF");
 237         if (imsg_add(wbuf, &namelen, sizeof(namelen)) == -1)
 238                 return got_error_from_errno("imsg_add REF");
 239         if (imsg_add(wbuf, refname, namelen) == -1)
 240                 return got_error_from_errno("imsg_add REF");
 241
 242         wbuf->fd = -1;
 243         imsg_close(ibuf, wbuf);
 244
 245         err = got_object_open(&obj, repo_read.repo, id);
 246         if (err)
 247                 goto done;
 248         if (obj->type == GOT_OBJ_TYPE_TAG)
 249                 err = send_peeled_tag_ref(ref, obj, ibuf);
 250 done:
 251         if (obj)
 252                 got_object_close(obj);
 253         free(id);
 254         return err;
 255 }
 256
 257 static const struct got_error *
 258 list_refs(struct imsg *imsg)
 259 {
 260         const struct got_error *err;
 261         struct repo_read_client *client = &repo_read_client;
 262         struct got_reflist_head refs;
 263         struct got_reflist_entry *re;
 264         struct gotd_imsg_list_refs_internal ireq;
 265         size_t datalen;
 266         struct gotd_imsg_reflist irefs;
 267         struct imsgbuf ibuf;
 268         int client_fd = imsg->fd;
 269         struct got_object_id *head_target_id = NULL;
 270
 271         TAILQ_INIT(&refs);
 272
 273         if (client_fd == -1)
 274                 return got_error(GOT_ERR_PRIVSEP_NO_FD);
 275
 276         datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 277         if (datalen != sizeof(ireq))
 278                 return got_error(GOT_ERR_PRIVSEP_LEN);
 279         memcpy(&ireq, imsg->data, sizeof(ireq));
 280
 281         if (ireq.client_id == 0)
 282                 return got_error(GOT_ERR_CLIENT_ID);
 283         if (client->id != 0) {
 284                 return got_error_msg(GOT_ERR_CLIENT_ID,
 285                     "duplicate list-refs request");
 286         }
 287         client->id = ireq.client_id;
 288         client->fd = client_fd;
 289
 290         imsg_init(&ibuf, client_fd);
 291
 292         err = got_ref_list(&refs, repo_read.repo, "",
 293             got_ref_cmp_by_name, NULL);
 294         if (err)
 295                 return err;
 296
 297         memset(&irefs, 0, sizeof(irefs));
 298         TAILQ_FOREACH(re, &refs, entry) {
 299                 struct got_object_id *id;
 300                 int obj_type;
 301
 302                 if (got_ref_is_symbolic(re->ref)) {
 303                         const char *refname = got_ref_get_name(re->ref);
 304                         if (strcmp(refname, GOT_REF_HEAD) != 0)
 305                                 continue;
 306                         err = got_ref_resolve(&head_target_id, repo_read.repo,
 307                             re->ref);
 308                         if (err) {
 309                                 if (err->code != GOT_ERR_NOT_REF)
 310                                         return err;
 311                                 /*
 312                                  * HEAD points to a non-existent branch.
 313                                  * Do not advertise it.
 314                                  * Matches git-daemon's behaviour.
 315                                  */
 316                                 head_target_id = NULL;
 317                                 err = NULL;
 318                         } else
 319                                 irefs.nrefs++;
 320                         continue;
 321                 }
 322
 323                 irefs.nrefs++;
 324
 325                 /* Account for a peeled tag refs. */
 326                 err = got_ref_resolve(&id, repo_read.repo, re->ref);
 327                 if (err)
 328                         goto done;
 329                 err = got_object_get_type(&obj_type, repo_read.repo, id);
 330                 free(id);
 331                 if (err)
 332                         goto done;
 333                 if (obj_type == GOT_OBJ_TYPE_TAG)
 334                         irefs.nrefs++;
 335         }
 336
 337         if (imsg_compose(&ibuf, GOTD_IMSG_REFLIST, PROC_REPO_READ,
 338             repo_read.pid, -1, &irefs, sizeof(irefs)) == -1) {
 339                 err = got_error_from_errno("imsg_compose REFLIST");
 340                 goto done;
 341         }
 342
 343         /*
 344          * Send the HEAD symref first. In Git-protocol versions < 2
 345          * the HEAD symref must be announced on the initial line of
 346          * the server's ref advertisement.
 347          * For now, we do not advertise symrefs other than HEAD.
 348          */
 349         TAILQ_FOREACH(re, &refs, entry) {
 350                 if (!got_ref_is_symbolic(re->ref) ||
 351                     strcmp(got_ref_get_name(re->ref), GOT_REF_HEAD) != 0 ||
 352                     head_target_id == NULL)
 353                         continue;
 354                 err = send_symref(re->ref, head_target_id, &ibuf);
 355                 if (err)
 356                         goto done;
 357                 break;
 358         }
 359         TAILQ_FOREACH(re, &refs, entry) {
 360                 if (got_ref_is_symbolic(re->ref))
 361                         continue;
 362                 err = send_ref(re->ref, &ibuf);
 363                 if (err)
 364                         goto done;
 365         }
 366
 367         err = gotd_imsg_flush(&ibuf);
 368 done:
 369         got_ref_list_free(&refs);
 370         imsg_clear(&ibuf);
 371         return err;
 372 }
 373
 374 static const struct got_error *
 375 append_object_id(struct got_object_id *id, void *data, void *arg)
 376 {
 377         struct gotd_object_id_array *array = arg;
 378         const size_t alloc_chunksz = 256;
 379
 380         if (array->ids == NULL) {
 381                 array->ids = reallocarray(NULL, alloc_chunksz,
 382                     sizeof(*array->ids));
 383                 if (array->ids == NULL)
 384                         return got_error_from_errno("reallocarray");
 385                 array->nalloc = alloc_chunksz;
 386                 array->nids = 0;
 387         } else if (array->nalloc <= array->nids) {
 388                 struct got_object_id **new;
 389                 new = recallocarray(array->ids, array->nalloc,
 390                     array->nalloc + alloc_chunksz, sizeof(*new));
 391                 if (new == NULL)
 392                         return got_error_from_errno("recallocarray");
 393                 array->ids = new;
 394                 array->nalloc += alloc_chunksz;
 395         }
 396
 397         array->ids[array->nids] = id;
 398         array->nids++;
 399         return NULL;
 400 }
 401
 402 static const struct got_error *
 403 recv_want(struct imsg *imsg)
 404 {
 405         const struct got_error *err;
 406         struct repo_read_client *client = &repo_read_client;
 407         struct gotd_imsg_want iwant;
 408         size_t datalen;
 409         char hex[SHA1_DIGEST_STRING_LENGTH];
 410         struct got_object_id id;
 411         int obj_type;
 412         struct imsgbuf ibuf;
 413
 414         datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 415         if (datalen != sizeof(iwant))
 416                 return got_error(GOT_ERR_PRIVSEP_LEN);
 417         memcpy(&iwant, imsg->data, sizeof(iwant));
 418
 419         memset(&id, 0, sizeof(id));
 420         memcpy(id.sha1, iwant.object_id, SHA1_DIGEST_LENGTH);
 421
 422         if (log_getverbose() > 0 &&
 423             got_sha1_digest_to_str(id.sha1, hex, sizeof(hex)))
 424                 log_debug("client wants %s", hex);
 425
 426         imsg_init(&ibuf, client->fd);
 427
 428         err = got_object_get_type(&obj_type, repo_read.repo, &id);
 429         if (err)
 430                 return err;
 431
 432         if (obj_type != GOT_OBJ_TYPE_COMMIT &&
 433             obj_type != GOT_OBJ_TYPE_TAG)
 434                 return got_error(GOT_ERR_OBJ_TYPE);
 435
 436         if (!got_object_idset_contains(client->want_ids, &id)) {
 437                 err = got_object_idset_add(client->want_ids, &id, NULL);
 438                 if (err)
 439                         return err;
 440         }
 441
 442         gotd_imsg_send_ack(&id, &ibuf, PROC_REPO_READ, repo_read.pid);
 443         imsg_clear(&ibuf);
 444         return err;
 445 }
 446
 447 static const struct got_error *
 448 recv_have(struct imsg *imsg)
 449 {
 450         const struct got_error *err;
 451         struct repo_read_client *client = &repo_read_client;
 452         struct gotd_imsg_have ihave;
 453         size_t datalen;
 454         char hex[SHA1_DIGEST_STRING_LENGTH];
 455         struct got_object_id id;
 456         int obj_type;
 457         struct imsgbuf ibuf;
 458
 459         datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 460         if (datalen != sizeof(ihave))
 461                 return got_error(GOT_ERR_PRIVSEP_LEN);
 462         memcpy(&ihave, imsg->data, sizeof(ihave));
 463
 464         memset(&id, 0, sizeof(id));
 465         memcpy(id.sha1, ihave.object_id, SHA1_DIGEST_LENGTH);
 466
 467         if (log_getverbose() > 0 &&
 468             got_sha1_digest_to_str(id.sha1, hex, sizeof(hex)))
 469                 log_debug("client has %s", hex);
 470
 471         imsg_init(&ibuf, client->fd);
 472
 473         err = got_object_get_type(&obj_type, repo_read.repo, &id);
 474         if (err) {
 475                 if (err->code == GOT_ERR_NO_OBJ) {
 476                         gotd_imsg_send_nak(&id, &ibuf,
 477                             PROC_REPO_READ, repo_read.pid);
 478                         err = NULL;
 479                 }
 480                 goto done;
 481         }
 482
 483         if (obj_type != GOT_OBJ_TYPE_COMMIT &&
 484             obj_type != GOT_OBJ_TYPE_TAG) {
 485                 gotd_imsg_send_nak(&id, &ibuf, PROC_REPO_READ, repo_read.pid);
 486                 err = got_error(GOT_ERR_OBJ_TYPE);
 487                 goto done;
 488         }
 489
 490         if (!got_object_idset_contains(client->have_ids, &id)) {
 491                 err = got_object_idset_add(client->have_ids, &id, NULL);
 492                 if (err)
 493                         goto done;
 494         }
 495
 496         gotd_imsg_send_ack(&id, &ibuf, PROC_REPO_READ, repo_read.pid);
 497 done:
 498         imsg_clear(&ibuf);
 499         return err;
 500 }
 501
 502 struct repo_read_pack_progress_arg {
 503         int report_progress;
 504         struct imsgbuf *ibuf;
 505         int sent_ready;
 506 };
 507
 508 static const struct got_error *
 509 pack_progress(void *arg, int ncolored, int nfound, int ntrees,
 510     off_t packfile_size, int ncommits, int nobj_total, int nobj_deltify,
 511     int nobj_written)
 512 {
 513         struct repo_read_pack_progress_arg *a = arg;
 514         struct gotd_imsg_packfile_progress iprog;
 515         int ret;
 516
 517         if (!a->report_progress)
 518                 return NULL;
 519         if (packfile_size > 0 && a->sent_ready)
 520                 return NULL;
 521
 522         memset(&iprog, 0, sizeof(iprog));
 523         iprog.ncolored = ncolored;
 524         iprog.nfound = nfound;
 525         iprog.ntrees = ntrees;
 526         iprog.packfile_size = packfile_size;
 527         iprog.ncommits = ncommits;
 528         iprog.nobj_total = nobj_total;
 529         iprog.nobj_deltify = nobj_deltify;
 530         iprog.nobj_written = nobj_written;
 531
 532         /* Using synchronous writes since we are blocking the event loop. */
 533         if (packfile_size == 0) {
 534                 ret = imsg_compose(a->ibuf, GOTD_IMSG_PACKFILE_PROGRESS,
 535                     PROC_REPO_READ, repo_read.pid, -1, &iprog, sizeof(iprog));
 536                 if (ret == -1) {
 537                         return got_error_from_errno("imsg compose "
 538                             "PACKFILE_PROGRESS");
 539                 }
 540         } else {
 541                 a->sent_ready = 1;
 542                 ret = imsg_compose(a->ibuf, GOTD_IMSG_PACKFILE_READY,
 543                     PROC_REPO_READ, repo_read.pid, -1, &iprog, sizeof(iprog));
 544                 if (ret == -1) {
 545                         return got_error_from_errno("imsg compose "
 546                             "PACKFILE_READY");
 547                 }
 548         }
 549
 550         return gotd_imsg_flush(a->ibuf);
 551 }
 552
 553 static const struct got_error *
 554 receive_delta_cache_fd(struct imsg *imsg,
 555     struct gotd_imsgev *iev)
 556 {
 557         struct repo_read_client *client = &repo_read_client;
 558         struct gotd_imsg_send_packfile ireq;
 559         size_t datalen;
 560
 561         log_debug("receiving delta cache file");
 562
 563         if (imsg->fd == -1)
 564                 return got_error(GOT_ERR_PRIVSEP_NO_FD);
 565
 566         datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 567         if (datalen != sizeof(ireq))
 568                 return got_error(GOT_ERR_PRIVSEP_LEN);
 569         memcpy(&ireq, imsg->data, sizeof(ireq));
 570
 571         if (client->delta_cache_fd != -1)
 572                 return got_error(GOT_ERR_PRIVSEP_MSG);
 573
 574         client->delta_cache_fd = imsg->fd;
 575         client->report_progress = ireq.report_progress;
 576         return NULL;
 577 }
 578
 579 static const struct got_error *
 580 receive_pack_pipe(struct imsg *imsg, struct gotd_imsgev *iev)
 581 {
 582         struct repo_read_client *client = &repo_read_client;
 583         struct gotd_imsg_packfile_pipe ireq;
 584         size_t datalen;
 585
 586         log_debug("receiving pack pipe descriptor");
 587
 588         if (imsg->fd == -1)
 589                 return got_error(GOT_ERR_PRIVSEP_NO_FD);
 590
 591         datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 592         if (datalen != sizeof(ireq))
 593                 return got_error(GOT_ERR_PRIVSEP_LEN);
 594         memcpy(&ireq, imsg->data, sizeof(ireq));
 595
 596         if (client->pack_pipe != -1)
 597                 return got_error(GOT_ERR_PRIVSEP_MSG);
 598
 599         client->pack_pipe = imsg->fd;
 600         return NULL;
 601 }
 602
 603 static const struct got_error *
 604 send_packfile(struct imsg *imsg, struct gotd_imsgev *iev)
 605 {
 606         const struct got_error *err = NULL;
 607         struct repo_read_client *client = &repo_read_client;
 608         struct gotd_imsg_packfile_done idone;
 609         uint8_t packsha1[SHA1_DIGEST_LENGTH];
 610         char hex[SHA1_DIGEST_STRING_LENGTH];
 611         FILE *delta_cache = NULL;
 612         struct imsgbuf ibuf;
 613         struct repo_read_pack_progress_arg pa;
 614         struct got_ratelimit rl;
 615         struct gotd_object_id_array want_ids;
 616         struct gotd_object_id_array have_ids;
 617
 618         log_debug("packfile request received");
 619
 620         memset(&want_ids, 0, sizeof(want_ids));
 621         memset(&have_ids, 0, sizeof(have_ids));
 622
 623         got_ratelimit_init(&rl, 2, 0);
 624
 625         if (client->delta_cache_fd == -1 || client->pack_pipe == -1)
 626                 return got_error(GOT_ERR_PRIVSEP_NO_FD);
 627
 628         imsg_init(&ibuf, client->fd);
 629
 630         delta_cache = fdopen(client->delta_cache_fd, "w+");
 631         if (delta_cache == NULL) {
 632                 err = got_error_from_errno("fdopen");
 633                 goto done;
 634         }
 635         client->delta_cache_fd = -1;
 636
 637         memset(&pa, 0, sizeof(pa));
 638         pa.ibuf = &ibuf;
 639         pa.report_progress = client->report_progress;
 640
 641         err = got_object_idset_for_each(client->want_ids,
 642             append_object_id, &want_ids);
 643         if (err)
 644                 goto done;
 645         err = got_object_idset_for_each(client->have_ids,
 646            append_object_id, &have_ids);
 647         if (err)
 648                 goto done;
 649
 650         err = got_pack_create(packsha1, client->pack_pipe, delta_cache,
 651             have_ids.ids, have_ids.nids, want_ids.ids, want_ids.nids,
 652             repo_read.repo, 0, 1, 0, pack_progress, &pa, &rl,
 653             check_cancelled, NULL);
 654         if (err)
 655                 goto done;
 656
 657         if (log_getverbose() > 0 &&
 658             got_sha1_digest_to_str(packsha1, hex, sizeof(hex)))
 659                 log_debug("sent pack-%s.pack", hex);
 660
 661         memset(&idone, 0, sizeof(idone));
 662         idone.client_id = client->id;
 663         if (gotd_imsg_compose_event(iev, GOTD_IMSG_PACKFILE_DONE,
 664             PROC_REPO_READ, -1, &idone, sizeof(idone)) == -1)
 665                 err = got_error_from_errno("imsg compose PACKFILE_DONE");
 666 done:
 667         if (delta_cache != NULL && fclose(delta_cache) == EOF && err == NULL)
 668                 err = got_error_from_errno("fclose");
 669         imsg_clear(&ibuf);
 670         free(want_ids.ids);
 671         free(have_ids.ids);
 672         return err;
 673 }
 674
 675 static void
 676 repo_read_dispatch_session(int fd, short event, void *arg)
 677 {
 678         const struct got_error *err = NULL;
 679         struct gotd_imsgev *iev = arg;
 680         struct imsgbuf *ibuf = &iev->ibuf;
 681         struct imsg imsg;
 682         ssize_t n;
 683         int shut = 0;
 684         struct repo_read_client *client = &repo_read_client;
 685
 686         if (event & EV_READ) {
 687                 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
 688                         fatal("imsg_read error");
 689                 if (n == 0)     /* Connection closed. */
 690                         shut = 1;
 691         }
 692
 693         if (event & EV_WRITE) {
 694                 n = msgbuf_write(&ibuf->w);
 695                 if (n == -1 && errno != EAGAIN)
 696                         fatal("msgbuf_write");
 697                 if (n == 0)     /* Connection closed. */
 698                         shut = 1;
 699         }
 700
 701         while (err == NULL && check_cancelled(NULL) == NULL) {
 702                 if ((n = imsg_get(ibuf, &imsg)) == -1)
 703                         fatal("%s: imsg_get", __func__);
 704                 if (n == 0)     /* No more messages. */
 705                         break;
 706
 707                 if (imsg.hdr.type != GOTD_IMSG_LIST_REFS_INTERNAL &&
 708                     client->id == 0) {
 709                         err = got_error(GOT_ERR_PRIVSEP_MSG);
 710                         break;
 711                 }
 712
 713                 switch (imsg.hdr.type) {
 714                 case GOTD_IMSG_LIST_REFS_INTERNAL:
 715                         err = list_refs(&imsg);
 716                         if (err)
 717                                 log_warnx("ls-refs: %s", err->msg);
 718                         break;
 719                 case GOTD_IMSG_WANT:
 720                         err = recv_want(&imsg);
 721                         if (err)
 722                                 log_warnx("want-line: %s", err->msg);
 723                         break;
 724                 case GOTD_IMSG_HAVE:
 725                         err = recv_have(&imsg);
 726                         if (err)
 727                                 log_warnx("have-line: %s", err->msg);
 728                         break;
 729                 case GOTD_IMSG_SEND_PACKFILE:
 730                         err = receive_delta_cache_fd(&imsg, iev);
 731                         if (err)
 732                                 log_warnx("receiving delta cache: %s",
 733                                     err->msg);
 734                         break;
 735                 case GOTD_IMSG_PACKFILE_PIPE:
 736                         err = receive_pack_pipe(&imsg, iev);
 737                         if (err) {
 738                                 log_warnx("receiving pack pipe: %s", err->msg);
 739                                 break;
 740                         }
 741                         err = send_packfile(&imsg, iev);
 742                         if (err)
 743                                 log_warnx("sending packfile: %s", err->msg);
 744                         break;
 745                 default:
 746                         log_debug("unexpected imsg %d", imsg.hdr.type);
 747                         break;
 748                 }
 749
 750                 imsg_free(&imsg);
 751         }
 752
 753         if (!shut && check_cancelled(NULL) == NULL) {
 754                 if (err &&
 755                     gotd_imsg_send_error_event(iev, PROC_REPO_READ,
 756                         client->id, err) == -1) {
 757                         log_warnx("could not send error to parent: %s",
 758                             err->msg);
 759                 }
 760                 gotd_imsg_event_add(iev);
 761         } else {
 762                 /* This pipe is dead. Remove its event handler */
 763                 event_del(&iev->ev);
 764                 event_loopexit(NULL);
 765         }
 766 }
 767
 768 static const struct got_error *
 769 recv_connect(struct imsg *imsg)
 770 {
 771         struct gotd_imsgev *iev = &repo_read.session_iev;
 772         size_t datalen;
 773
 774         datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 775         if (datalen != 0)
 776                 return got_error(GOT_ERR_PRIVSEP_LEN);
 777         if (imsg->fd == -1)
 778                 return got_error(GOT_ERR_PRIVSEP_NO_FD);
 779
 780         if (repo_read.session_fd != -1)
 781                 return got_error(GOT_ERR_PRIVSEP_MSG);
 782
 783         repo_read.session_fd = imsg->fd;
 784
 785         imsg_init(&iev->ibuf, repo_read.session_fd);
 786         iev->handler = repo_read_dispatch_session;
 787         iev->events = EV_READ;
 788         iev->handler_arg = NULL;
 789         event_set(&iev->ev, iev->ibuf.fd, EV_READ,
 790             repo_read_dispatch_session, iev);
 791         gotd_imsg_event_add(iev);
 792
 793         return NULL;
 794 }
 795
 796 static void
 797 repo_read_dispatch(int fd, short event, void *arg)
 798 {
 799         const struct got_error *err = NULL;
 800         struct gotd_imsgev *iev = arg;
 801         struct imsgbuf *ibuf = &iev->ibuf;
 802         struct imsg imsg;
 803         ssize_t n;
 804         int shut = 0;
 805         struct repo_read_client *client = &repo_read_client;
 806
 807         if (event & EV_READ) {
 808                 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
 809                         fatal("imsg_read error");
 810                 if (n == 0)     /* Connection closed. */
 811                         shut = 1;
 812         }
 813
 814         if (event & EV_WRITE) {
 815                 n = msgbuf_write(&ibuf->w);
 816                 if (n == -1 && errno != EAGAIN)
 817                         fatal("msgbuf_write");
 818                 if (n == 0)     /* Connection closed. */
 819                         shut = 1;
 820         }
 821
 822         while (err == NULL && check_cancelled(NULL) == NULL) {
 823                 if ((n = imsg_get(ibuf, &imsg)) == -1)
 824                         fatal("%s: imsg_get", __func__);
 825                 if (n == 0)     /* No more messages. */
 826                         break;
 827
 828                 switch (imsg.hdr.type) {
 829                 case GOTD_IMSG_CONNECT_REPO_CHILD:
 830                         err = recv_connect(&imsg);
 831                         break;
 832                 default:
 833                         log_debug("unexpected imsg %d", imsg.hdr.type);
 834                         break;
 835                 }
 836
 837                 imsg_free(&imsg);
 838         }
 839
 840         if (!shut && check_cancelled(NULL) == NULL) {
 841                 if (err &&
 842                     gotd_imsg_send_error_event(iev, PROC_REPO_READ,
 843                         client->id, err) == -1) {
 844                         log_warnx("could not send error to parent: %s",
 845                             err->msg);
 846                 }
 847                 gotd_imsg_event_add(iev);
 848         } else {
 849                 /* This pipe is dead. Remove its event handler */
 850                 event_del(&iev->ev);
 851                 event_loopexit(NULL);
 852         }
 853 }
 854
 855 void
 856 repo_read_main(const char *title, const char *repo_path,
 857     int *pack_fds, int *temp_fds)
 858 {
 859         const struct got_error *err = NULL;
 860         struct repo_read_client *client = &repo_read_client;
 861         struct gotd_imsgev iev;
 862
 863         client->fd = -1;
 864         client->delta_cache_fd = -1;
 865         client->pack_pipe = -1;
 866         client->have_ids = got_object_idset_alloc();
 867         if (client->have_ids == NULL) {
 868                 err = got_error_from_errno("got_object_idset_alloc");
 869                 goto done;
 870         }
 871         client->want_ids = got_object_idset_alloc();
 872         if (client->want_ids == NULL) {
 873                 err = got_error_from_errno("got_object_idset_alloc");
 874                 goto done;
 875         }
 876
 877         repo_read.title = title;
 878         repo_read.pid = getpid();
 879         repo_read.pack_fds = pack_fds;
 880         repo_read.temp_fds = temp_fds;
 881         repo_read.session_fd = -1;
 882         repo_read.session_iev.ibuf.fd = -1;
 883
 884         err = got_repo_open(&repo_read.repo, repo_path, NULL, pack_fds);
 885         if (err)
 886                 goto done;
 887         if (!got_repo_is_bare(repo_read.repo)) {
 888                 err = got_error_msg(GOT_ERR_NOT_GIT_REPO,
 889                     "bare git repository required");
 890                 goto done;
 891         }
 892
 893         got_repo_temp_fds_set(repo_read.repo, temp_fds);
 894
 895         signal(SIGINT, catch_sigint);
 896         signal(SIGTERM, catch_sigterm);
 897         signal(SIGPIPE, SIG_IGN);
 898         signal(SIGHUP, SIG_IGN);
 899
 900         imsg_init(&iev.ibuf, GOTD_FILENO_MSG_PIPE);
 901         iev.handler = repo_read_dispatch;
 902         iev.events = EV_READ;
 903         iev.handler_arg = NULL;
 904         event_set(&iev.ev, iev.ibuf.fd, EV_READ, repo_read_dispatch, &iev);
 905
 906         if (gotd_imsg_compose_event(&iev, GOTD_IMSG_REPO_CHILD_READY,
 907             PROC_REPO_READ, -1, NULL, 0) == -1) {
 908                 err = got_error_from_errno("imsg compose REPO_CHILD_READY");
 909                 goto done;
 910         }
 911
 912         event_dispatch();
 913 done:
 914         if (err)
 915                 log_warnx("%s: %s", title, err->msg);
 916         repo_read_shutdown();
 917 }
 918
 919 void
 920 repo_read_shutdown(void)
 921 {
 922         struct repo_read_client *client = &repo_read_client;
 923
 924         log_debug("shutting down");
 925
 926         if (client->have_ids)
 927                 got_object_idset_free(client->have_ids);
 928         if (client->want_ids)
 929                 got_object_idset_free(client->want_ids);
 930         if (client->fd != -1)
 931                 close(client->fd);
 932         if (client->delta_cache_fd != -1)
 933                 close(client->delta_cache_fd);
 934         if (client->pack_pipe != -1)
 935                 close(client->pack_pipe);
 936
 937         if (repo_read.repo)
 938                 got_repo_close(repo_read.repo);
 939         got_repo_pack_fds_close(repo_read.pack_fds);
 940         got_repo_temp_fds_close(repo_read.temp_fds);
 941         if (repo_read.session_fd != -1)
 942                 close(repo_read.session_fd);
 943         exit(0);
 944 }