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 "got_compat.h"
  18
  19 #include <sys/queue.h>
  20 #include <sys/types.h>
  21
  22 #include <event.h>
  23 #include <errno.h>
  24 #include <imsg.h>
  25 #include <signal.h>
  26 #include <stdlib.h>
  27 #include <limits.h>
  28 #include <poll.h>
  29 #include <stdio.h>
  30 #include <string.h>
  31 #include <unistd.h>
  32
  33 #include "got_error.h"
  34 #include "got_cancel.h"
  35 #include "got_object.h"
  36 #include "got_repository.h"
  37 #include "got_reference.h"
  38 #include "got_repository_admin.h"
  39 #include "got_path.h"
  40
  41 #include "got_lib_delta.h"
  42 #include "got_lib_object.h"
  43 #include "got_lib_object_idset.h"
  44 #include "got_lib_hash.h"
  45 #include "got_lib_pack.h"
  46 #include "got_lib_ratelimit.h"
  47 #include "got_lib_pack_create.h"
  48 #include "got_lib_poll.h"
  49
  50 #include "log.h"
  51 #include "gotd.h"
  52 #include "repo_read.h"
  53
  54 #ifndef nitems
  55 #define nitems(_a)      (sizeof((_a)) / sizeof((_a)[0]))
  56 #endif
  57
  58 static struct repo_read {
  59         pid_t pid;
  60         const char *title;
  61         struct got_repository *repo;
  62         int *pack_fds;
  63         int *temp_fds;
  64         int session_fd;
  65         struct gotd_imsgev session_iev;
  66         int refs_listed;
  67 } repo_read;
  68
  69 static struct repo_read_client {
  70         uint32_t                         id;
  71         int                              fd;
  72         int                              delta_cache_fd;
  73         int                              report_progress;
  74         int                              pack_pipe;
  75         struct got_object_idset         *want_ids;
  76         struct got_object_idset         *have_ids;
  77 } repo_read_client;
  78
  79 static volatile sig_atomic_t sigint_received;
  80 static volatile sig_atomic_t sigterm_received;
  81
  82 static void
  83 catch_sigint(int signo)
  84 {
  85         sigint_received = 1;
  86 }
  87
  88 static void
  89 catch_sigterm(int signo)
  90 {
  91         sigterm_received = 1;
  92 }
  93
  94 static const struct got_error *
  95 check_cancelled(void *arg)
  96 {
  97         if (sigint_received || sigterm_received)
  98                 return got_error(GOT_ERR_CANCELLED);
  99
 100         return NULL;
 101 }
 102
 103 static const struct got_error *
 104 send_symref(struct got_reference *symref, struct got_object_id *target_id,
 105     struct imsgbuf *ibuf)
 106 {
 107         const struct got_error *err = NULL;
 108         struct gotd_imsg_symref isymref;
 109         const char *refname = got_ref_get_name(symref);
 110         const char *target = got_ref_get_symref_target(symref);
 111         size_t len;
 112         struct ibuf *wbuf;
 113
 114         memset(&isymref, 0, sizeof(isymref));
 115         isymref.name_len = strlen(refname);
 116         isymref.target_len = strlen(target);
 117         memcpy(isymref.target_id, target_id->hash, sizeof(isymref.target_id));
 118
 119         len = sizeof(isymref) + isymref.name_len + isymref.target_len;
 120         if (len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
 121                 err = got_error(GOT_ERR_NO_SPACE);
 122                 goto done;
 123         }
 124
 125         wbuf = imsg_create(ibuf, GOTD_IMSG_SYMREF, 0, 0, len);
 126         if (wbuf == NULL) {
 127                 err = got_error_from_errno("imsg_create SYMREF");
 128                 goto done;
 129         }
 130
 131         if (imsg_add(wbuf, &isymref, sizeof(isymref)) == -1) {
 132                 err = got_error_from_errno("imsg_add SYMREF");
 133                 goto done;
 134         }
 135         if (imsg_add(wbuf, refname, isymref.name_len) == -1) {
 136                 err = got_error_from_errno("imsg_add SYMREF");
 137                 goto done;
 138         }
 139         if (imsg_add(wbuf, target, isymref.target_len) == -1) {
 140                 err = got_error_from_errno("imsg_add SYMREF");
 141                 goto done;
 142         }
 143
 144         imsg_close(ibuf, wbuf);
 145 done:
 146         free(target_id);
 147         return err;
 148 }
 149
 150 static const struct got_error *
 151 send_peeled_tag_ref(struct got_reference *ref, struct got_object *obj,
 152     struct imsgbuf *ibuf)
 153 {
 154         const struct got_error *err = NULL;
 155         struct got_tag_object *tag;
 156         size_t namelen, len;
 157         char *peeled_refname = NULL;
 158         struct got_object_id *id;
 159         struct ibuf *wbuf;
 160
 161         err = got_object_tag_open(&tag, repo_read.repo, obj);
 162         if (err)
 163                 return err;
 164
 165         if (asprintf(&peeled_refname, "%s^{}", got_ref_get_name(ref)) == -1) {
 166                 err = got_error_from_errno("asprintf");
 167                 goto done;
 168         }
 169
 170         id = got_object_tag_get_object_id(tag);
 171         namelen = strlen(peeled_refname);
 172
 173         len = sizeof(struct gotd_imsg_ref) + namelen;
 174         if (len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
 175                 err = got_error(GOT_ERR_NO_SPACE);
 176                 goto done;
 177         }
 178
 179         wbuf = imsg_create(ibuf, GOTD_IMSG_REF, PROC_REPO_READ,
 180             repo_read.pid, len);
 181         if (wbuf == NULL) {
 182                 err = got_error_from_errno("imsg_create MREF");
 183                 goto done;
 184         }
 185
 186         /* Keep in sync with struct gotd_imsg_ref definition. */
 187         if (imsg_add(wbuf, id->hash, SHA1_DIGEST_LENGTH) == -1) {
 188                 err = got_error_from_errno("imsg_add REF");
 189                 goto done;
 190         }
 191         if (imsg_add(wbuf, &namelen, sizeof(namelen)) == -1) {
 192                 err = got_error_from_errno("imsg_add REF");
 193                 goto done;
 194         }
 195         if (imsg_add(wbuf, peeled_refname, namelen) == -1) {
 196                 err = got_error_from_errno("imsg_add REF");
 197                 goto done;
 198         }
 199
 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->hash, 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         imsg_close(ibuf, wbuf);
 243
 244         err = got_object_open(&obj, repo_read.repo, id);
 245         if (err)
 246                 goto done;
 247         if (obj->type == GOT_OBJ_TYPE_TAG)
 248                 err = send_peeled_tag_ref(ref, obj, ibuf);
 249 done:
 250         if (obj)
 251                 got_object_close(obj);
 252         free(id);
 253         return err;
 254 }
 255
 256 static const struct got_error *
 257 list_refs(struct imsg *imsg)
 258 {
 259         const struct got_error *err;
 260         struct repo_read_client *client = &repo_read_client;
 261         struct got_reflist_head refs;
 262         struct got_reflist_entry *re;
 263         size_t datalen;
 264         struct gotd_imsg_reflist irefs;
 265         struct imsgbuf ibuf;
 266         struct got_object_id *head_target_id = NULL;
 267
 268         TAILQ_INIT(&refs);
 269
 270         datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 271         if (datalen != 0)
 272                 return got_error(GOT_ERR_PRIVSEP_LEN);
 273
 274         if (repo_read.refs_listed) {
 275                 return got_error_msg(GOT_ERR_CLIENT_ID,
 276                     "duplicate list-refs request");
 277         }
 278         repo_read.refs_listed = 1;
 279
 280         client->fd = imsg_get_fd(imsg);
 281         if (client->fd == -1)
 282                 return got_error(GOT_ERR_PRIVSEP_NO_FD);
 283
 284         if (imsgbuf_init(&ibuf, client->fd) == -1)
 285                 return got_error_from_errno("imsgbuf_init");
 286         imsgbuf_allow_fdpass(&ibuf);
 287
 288         err = got_ref_list(&refs, repo_read.repo, "",
 289             got_ref_cmp_by_name, NULL);
 290         if (err)
 291                 return err;
 292
 293         memset(&irefs, 0, sizeof(irefs));
 294         TAILQ_FOREACH(re, &refs, entry) {
 295                 struct got_object_id *id;
 296                 int obj_type;
 297
 298                 if (got_ref_is_symbolic(re->ref)) {
 299                         const char *refname = got_ref_get_name(re->ref);
 300                         if (strcmp(refname, GOT_REF_HEAD) != 0)
 301                                 continue;
 302                         err = got_ref_resolve(&head_target_id, repo_read.repo,
 303                             re->ref);
 304                         if (err) {
 305                                 if (err->code != GOT_ERR_NOT_REF)
 306                                         return err;
 307                                 /*
 308                                  * HEAD points to a non-existent branch.
 309                                  * Do not advertise it.
 310                                  * Matches git-daemon's behaviour.
 311                                  */
 312                                 head_target_id = NULL;
 313                                 err = NULL;
 314                         } else
 315                                 irefs.nrefs++;
 316                         continue;
 317                 }
 318
 319                 irefs.nrefs++;
 320
 321                 /* Account for a peeled tag refs. */
 322                 err = got_ref_resolve(&id, repo_read.repo, re->ref);
 323                 if (err)
 324                         goto done;
 325                 err = got_object_get_type(&obj_type, repo_read.repo, id);
 326                 free(id);
 327                 if (err)
 328                         goto done;
 329                 if (obj_type == GOT_OBJ_TYPE_TAG)
 330                         irefs.nrefs++;
 331         }
 332
 333         if (imsg_compose(&ibuf, GOTD_IMSG_REFLIST, PROC_REPO_READ,
 334             repo_read.pid, -1, &irefs, sizeof(irefs)) == -1) {
 335                 err = got_error_from_errno("imsg_compose REFLIST");
 336                 goto done;
 337         }
 338
 339         /*
 340          * Send the HEAD symref first. In Git-protocol versions < 2
 341          * the HEAD symref must be announced on the initial line of
 342          * the server's ref advertisement.
 343          * For now, we do not advertise symrefs other than HEAD.
 344          */
 345         TAILQ_FOREACH(re, &refs, entry) {
 346                 if (!got_ref_is_symbolic(re->ref) ||
 347                     strcmp(got_ref_get_name(re->ref), GOT_REF_HEAD) != 0 ||
 348                     head_target_id == NULL)
 349                         continue;
 350                 err = send_symref(re->ref, head_target_id, &ibuf);
 351                 if (err)
 352                         goto done;
 353                 break;
 354         }
 355         TAILQ_FOREACH(re, &refs, entry) {
 356                 if (got_ref_is_symbolic(re->ref))
 357                         continue;
 358                 err = send_ref(re->ref, &ibuf);
 359                 if (err)
 360                         goto done;
 361         }
 362
 363         err = gotd_imsg_flush(&ibuf);
 364 done:
 365         got_ref_list_free(&refs);
 366         imsgbuf_clear(&ibuf);
 367         return err;
 368 }
 369
 370 static const struct got_error *
 371 append_object_id(struct got_object_id *id, void *data, void *arg)
 372 {
 373         struct gotd_object_id_array *array = arg;
 374         const size_t alloc_chunksz = 256;
 375
 376         if (array->ids == NULL) {
 377                 array->ids = reallocarray(NULL, alloc_chunksz,
 378                     sizeof(*array->ids));
 379                 if (array->ids == NULL)
 380                         return got_error_from_errno("reallocarray");
 381                 array->nalloc = alloc_chunksz;
 382                 array->nids = 0;
 383         } else if (array->nalloc <= array->nids) {
 384                 struct got_object_id **new;
 385                 new = recallocarray(array->ids, array->nalloc,
 386                     array->nalloc + alloc_chunksz, sizeof(*new));
 387                 if (new == NULL)
 388                         return got_error_from_errno("recallocarray");
 389                 array->ids = new;
 390                 array->nalloc += alloc_chunksz;
 391         }
 392
 393         array->ids[array->nids] = id;
 394         array->nids++;
 395         return NULL;
 396 }
 397
 398 static const struct got_error *
 399 recv_want(struct imsg *imsg)
 400 {
 401         const struct got_error *err;
 402         struct repo_read_client *client = &repo_read_client;
 403         struct gotd_imsg_want iwant;
 404         size_t datalen;
 405         char hex[SHA1_DIGEST_STRING_LENGTH];
 406         struct got_object_id id;
 407         int obj_type;
 408         struct imsgbuf ibuf;
 409
 410         datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 411         if (datalen != sizeof(iwant))
 412                 return got_error(GOT_ERR_PRIVSEP_LEN);
 413         memcpy(&iwant, imsg->data, sizeof(iwant));
 414
 415         memset(&id, 0, sizeof(id));
 416         memcpy(id.hash, iwant.object_id, SHA1_DIGEST_LENGTH);
 417
 418         if (log_getverbose() > 0 &&
 419             got_object_id_hex(&id, hex, sizeof(hex)))
 420                 log_debug("client wants %s", hex);
 421
 422         if (imsgbuf_init(&ibuf, client->fd) == -1)
 423                 return got_error_from_errno("imsgbuf_init");
 424         imsgbuf_allow_fdpass(&ibuf);
 425
 426         err = got_object_get_type(&obj_type, repo_read.repo, &id);
 427         if (err)
 428                 return err;
 429
 430         if (obj_type != GOT_OBJ_TYPE_COMMIT &&
 431             obj_type != GOT_OBJ_TYPE_TAG)
 432                 return got_error(GOT_ERR_OBJ_TYPE);
 433
 434         if (!got_object_idset_contains(client->want_ids, &id)) {
 435                 err = got_object_idset_add(client->want_ids, &id, NULL);
 436                 if (err)
 437                         return err;
 438         }
 439
 440         gotd_imsg_send_ack(&id, &ibuf, PROC_REPO_READ, repo_read.pid);
 441         imsgbuf_clear(&ibuf);
 442         return err;
 443 }
 444
 445 static const struct got_error *
 446 recv_have(struct imsg *imsg)
 447 {
 448         const struct got_error *err;
 449         struct repo_read_client *client = &repo_read_client;
 450         struct gotd_imsg_have ihave;
 451         size_t datalen;
 452         char hex[SHA1_DIGEST_STRING_LENGTH];
 453         struct got_object_id id;
 454         int obj_type;
 455         struct imsgbuf ibuf;
 456
 457         datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 458         if (datalen != sizeof(ihave))
 459                 return got_error(GOT_ERR_PRIVSEP_LEN);
 460         memcpy(&ihave, imsg->data, sizeof(ihave));
 461
 462         memset(&id, 0, sizeof(id));
 463         memcpy(id.hash, ihave.object_id, SHA1_DIGEST_LENGTH);
 464
 465         if (log_getverbose() > 0 &&
 466             got_object_id_hex(&id, hex, sizeof(hex)))
 467                 log_debug("client has %s", hex);
 468
 469         if (imsgbuf_init(&ibuf, client->fd) == -1)
 470                 return got_error_from_errno("imsgbuf_init");
 471         imsgbuf_allow_fdpass(&ibuf);
 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         imsgbuf_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, int pack_done)
 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         datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 564         if (datalen != sizeof(ireq))
 565                 return got_error(GOT_ERR_PRIVSEP_LEN);
 566         memcpy(&ireq, imsg->data, sizeof(ireq));
 567
 568         if (client->delta_cache_fd != -1)
 569                 return got_error(GOT_ERR_PRIVSEP_MSG);
 570
 571         client->delta_cache_fd = imsg_get_fd(imsg);
 572         if (client->delta_cache_fd == -1)
 573                 return got_error(GOT_ERR_PRIVSEP_NO_FD);
 574
 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         size_t datalen;
 584
 585         log_debug("receiving pack pipe descriptor");
 586
 587         datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 588         if (datalen != 0)
 589                 return got_error(GOT_ERR_PRIVSEP_LEN);
 590
 591         if (client->pack_pipe != -1)
 592                 return got_error(GOT_ERR_PRIVSEP_MSG);
 593
 594         client->pack_pipe = imsg_get_fd(imsg);
 595         if (client->pack_pipe == -1)
 596                 return got_error(GOT_ERR_PRIVSEP_NO_FD);
 597
 598         return NULL;
 599 }
 600
 601 static const struct got_error *
 602 send_packfile(struct imsg *imsg, struct gotd_imsgev *iev)
 603 {
 604         const struct got_error *err = NULL;
 605         struct repo_read_client *client = &repo_read_client;
 606         struct got_object_id packhash;
 607         char hex[GOT_HASH_DIGEST_STRING_MAXLEN];
 608         FILE *delta_cache = NULL;
 609         struct imsgbuf ibuf;
 610         struct repo_read_pack_progress_arg pa;
 611         struct got_ratelimit rl;
 612         struct gotd_object_id_array want_ids;
 613         struct gotd_object_id_array have_ids;
 614
 615         log_debug("packfile request received");
 616
 617         memset(&want_ids, 0, sizeof(want_ids));
 618         memset(&have_ids, 0, sizeof(have_ids));
 619
 620         got_ratelimit_init(&rl, 2, 0);
 621
 622         if (client->delta_cache_fd == -1 || client->pack_pipe == -1)
 623                 return got_error(GOT_ERR_PRIVSEP_NO_FD);
 624
 625         if (imsgbuf_init(&ibuf, client->fd) == -1)
 626                 return got_error_from_errno("imsgbuf_init");
 627         imsgbuf_allow_fdpass(&ibuf);
 628
 629         delta_cache = fdopen(client->delta_cache_fd, "w+");
 630         if (delta_cache == NULL) {
 631                 err = got_error_from_errno("fdopen");
 632                 goto done;
 633         }
 634         client->delta_cache_fd = -1;
 635
 636         memset(&pa, 0, sizeof(pa));
 637         pa.ibuf = &ibuf;
 638         pa.report_progress = client->report_progress;
 639
 640         err = got_object_idset_for_each(client->want_ids,
 641             append_object_id, &want_ids);
 642         if (err)
 643                 goto done;
 644         err = got_object_idset_for_each(client->have_ids,
 645            append_object_id, &have_ids);
 646         if (err)
 647                 goto done;
 648
 649         err = got_pack_create(&packhash, client->pack_pipe, delta_cache,
 650             have_ids.ids, have_ids.nids, want_ids.ids, want_ids.nids,
 651             repo_read.repo, 0, 1, 0, pack_progress, &pa, &rl,
 652             check_cancelled, NULL);
 653         if (err)
 654                 goto done;
 655
 656         if (log_getverbose() > 0 &&
 657             got_hash_digest_to_str(packhash.hash, hex, sizeof(hex),
 658             packhash.algo))
 659                 log_debug("sent pack-%s.pack", hex);
 660
 661         if (gotd_imsg_compose_event(iev, GOTD_IMSG_PACKFILE_DONE,
 662             PROC_REPO_READ, -1, NULL, 0) == -1)
 663                 err = got_error_from_errno("imsg compose PACKFILE_DONE");
 664 done:
 665         if (client->delta_cache_fd != -1 &&
 666             close(client->delta_cache_fd) == -1 && err == NULL)
 667                 err = got_error_from_errno("close");
 668         client->delta_cache_fd = -1;
 669         if (delta_cache != NULL && fclose(delta_cache) == EOF && err == NULL)
 670                 err = got_error_from_errno("fclose");
 671         imsgbuf_clear(&ibuf);
 672         free(want_ids.ids);
 673         free(have_ids.ids);
 674         return err;
 675 }
 676
 677 static void
 678 repo_read_dispatch_session(int fd, short event, void *arg)
 679 {
 680         const struct got_error *err = NULL;
 681         struct gotd_imsgev *iev = arg;
 682         struct imsgbuf *ibuf = &iev->ibuf;
 683         struct imsg imsg;
 684         ssize_t n;
 685         int shut = 0;
 686         struct repo_read_client *client = &repo_read_client;
 687
 688         if (event & EV_READ) {
 689                 if ((n = imsgbuf_read(ibuf)) == -1)
 690                         fatal("imsgbuf_read error");
 691                 if (n == 0)     /* Connection closed. */
 692                         shut = 1;
 693         }
 694
 695         if (event & EV_WRITE) {
 696                 err = gotd_imsg_flush(ibuf);
 697                 if (err)
 698                         fatalx("%s", err->msg);
 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                     !repo_read.refs_listed) {
 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
 778         if (repo_read.session_fd != -1)
 779                 return got_error(GOT_ERR_PRIVSEP_MSG);
 780
 781         repo_read.session_fd = imsg_get_fd(imsg);
 782         if (repo_read.session_fd == -1)
 783                 return got_error(GOT_ERR_PRIVSEP_NO_FD);
 784
 785         if (imsgbuf_init(&iev->ibuf, repo_read.session_fd) == -1)
 786                 return got_error_from_errno("imsgbuf_init");
 787         imsgbuf_allow_fdpass(&iev->ibuf);
 788         iev->handler = repo_read_dispatch_session;
 789         iev->events = EV_READ;
 790         iev->handler_arg = NULL;
 791         event_set(&iev->ev, iev->ibuf.fd, EV_READ,
 792             repo_read_dispatch_session, iev);
 793         gotd_imsg_event_add(iev);
 794
 795         return NULL;
 796 }
 797
 798 static void
 799 repo_read_dispatch(int fd, short event, void *arg)
 800 {
 801         const struct got_error *err = NULL;
 802         struct gotd_imsgev *iev = arg;
 803         struct imsgbuf *ibuf = &iev->ibuf;
 804         struct imsg imsg;
 805         ssize_t n;
 806         int shut = 0;
 807         struct repo_read_client *client = &repo_read_client;
 808
 809         if (event & EV_READ) {
 810                 if ((n = imsgbuf_read(ibuf)) == -1)
 811                         fatal("imsgbuf_read error");
 812                 if (n == 0)     /* Connection closed. */
 813                         shut = 1;
 814         }
 815
 816         if (event & EV_WRITE) {
 817                 err = gotd_imsg_flush(ibuf);
 818                 if (err)
 819                         fatalx("%s", err->msg);
 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         if (got_repo_get_object_format(repo_read.repo) != GOT_HASH_SHA1) {
 893                 err = got_error_msg(GOT_ERR_NOT_IMPL,
 894                     "sha256 object IDs unsupported in network protocol");
 895                 goto done;
 896         }
 897
 898         got_repo_temp_fds_set(repo_read.repo, temp_fds);
 899
 900         signal(SIGINT, catch_sigint);
 901         signal(SIGTERM, catch_sigterm);
 902         signal(SIGPIPE, SIG_IGN);
 903         signal(SIGHUP, SIG_IGN);
 904
 905         if (imsgbuf_init(&iev.ibuf, GOTD_FILENO_MSG_PIPE) == -1) {
 906                 err = got_error_from_errno("imsgbuf_init");
 907                 goto done;
 908         }
 909         imsgbuf_allow_fdpass(&iev.ibuf);
 910         iev.handler = repo_read_dispatch;
 911         iev.events = EV_READ;
 912         iev.handler_arg = NULL;
 913         event_set(&iev.ev, iev.ibuf.fd, EV_READ, repo_read_dispatch, &iev);
 914
 915         if (gotd_imsg_compose_event(&iev, GOTD_IMSG_REPO_CHILD_READY,
 916             PROC_REPO_READ, -1, NULL, 0) == -1) {
 917                 err = got_error_from_errno("imsg compose REPO_CHILD_READY");
 918                 goto done;
 919         }
 920
 921         event_dispatch();
 922 done:
 923         if (err)
 924                 log_warnx("%s: %s", title, err->msg);
 925         repo_read_shutdown();
 926 }
 927
 928 void
 929 repo_read_shutdown(void)
 930 {
 931         struct repo_read_client *client = &repo_read_client;
 932
 933         log_debug("%s: shutting down", repo_read.title);
 934
 935         if (client->have_ids)
 936                 got_object_idset_free(client->have_ids);
 937         if (client->want_ids)
 938                 got_object_idset_free(client->want_ids);
 939         if (client->fd != -1)
 940                 close(client->fd);
 941         if (client->delta_cache_fd != -1)
 942                 close(client->delta_cache_fd);
 943         if (client->pack_pipe != -1)
 944                 close(client->pack_pipe);
 945
 946         if (repo_read.repo)
 947                 got_repo_close(repo_read.repo);
 948         got_repo_pack_fds_close(repo_read.pack_fds);
 949         got_repo_temp_fds_close(repo_read.temp_fds);
 950         if (repo_read.session_fd != -1)
 951                 close(repo_read.session_fd);
 952         exit(0);
 953 }