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->sha1, 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->sha1, 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->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         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         int client_fd;
 267         struct got_object_id *head_target_id = NULL;
 268
 269         TAILQ_INIT(&refs);
 270
 271         client_fd = imsg_get_fd(imsg);
 272         if (client_fd == -1)
 273                 return got_error(GOT_ERR_PRIVSEP_NO_FD);
 274
 275         datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 276         if (datalen != 0)
 277                 return got_error(GOT_ERR_PRIVSEP_LEN);
 278
 279         if (repo_read.refs_listed) {
 280                 return got_error_msg(GOT_ERR_CLIENT_ID,
 281                     "duplicate list-refs request");
 282         }
 283         repo_read.refs_listed = 1;
 284
 285         client->fd = client_fd;
 286
 287         imsg_init(&ibuf, client_fd);
 288
 289         err = got_ref_list(&refs, repo_read.repo, "",
 290             got_ref_cmp_by_name, NULL);
 291         if (err)
 292                 return err;
 293
 294         memset(&irefs, 0, sizeof(irefs));
 295         TAILQ_FOREACH(re, &refs, entry) {
 296                 struct got_object_id *id;
 297                 int obj_type;
 298
 299                 if (got_ref_is_symbolic(re->ref)) {
 300                         const char *refname = got_ref_get_name(re->ref);
 301                         if (strcmp(refname, GOT_REF_HEAD) != 0)
 302                                 continue;
 303                         err = got_ref_resolve(&head_target_id, repo_read.repo,
 304                             re->ref);
 305                         if (err) {
 306                                 if (err->code != GOT_ERR_NOT_REF)
 307                                         return err;
 308                                 /*
 309                                  * HEAD points to a non-existent branch.
 310                                  * Do not advertise it.
 311                                  * Matches git-daemon's behaviour.
 312                                  */
 313                                 head_target_id = NULL;
 314                                 err = NULL;
 315                         } else
 316                                 irefs.nrefs++;
 317                         continue;
 318                 }
 319
 320                 irefs.nrefs++;
 321
 322                 /* Account for a peeled tag refs. */
 323                 err = got_ref_resolve(&id, repo_read.repo, re->ref);
 324                 if (err)
 325                         goto done;
 326                 err = got_object_get_type(&obj_type, repo_read.repo, id);
 327                 free(id);
 328                 if (err)
 329                         goto done;
 330                 if (obj_type == GOT_OBJ_TYPE_TAG)
 331                         irefs.nrefs++;
 332         }
 333
 334         if (imsg_compose(&ibuf, GOTD_IMSG_REFLIST, PROC_REPO_READ,
 335             repo_read.pid, -1, &irefs, sizeof(irefs)) == -1) {
 336                 err = got_error_from_errno("imsg_compose REFLIST");
 337                 goto done;
 338         }
 339
 340         /*
 341          * Send the HEAD symref first. In Git-protocol versions < 2
 342          * the HEAD symref must be announced on the initial line of
 343          * the server's ref advertisement.
 344          * For now, we do not advertise symrefs other than HEAD.
 345          */
 346         TAILQ_FOREACH(re, &refs, entry) {
 347                 if (!got_ref_is_symbolic(re->ref) ||
 348                     strcmp(got_ref_get_name(re->ref), GOT_REF_HEAD) != 0 ||
 349                     head_target_id == NULL)
 350                         continue;
 351                 err = send_symref(re->ref, head_target_id, &ibuf);
 352                 if (err)
 353                         goto done;
 354                 break;
 355         }
 356         TAILQ_FOREACH(re, &refs, entry) {
 357                 if (got_ref_is_symbolic(re->ref))
 358                         continue;
 359                 err = send_ref(re->ref, &ibuf);
 360                 if (err)
 361                         goto done;
 362         }
 363
 364         err = gotd_imsg_flush(&ibuf);
 365 done:
 366         got_ref_list_free(&refs);
 367         imsg_clear(&ibuf);
 368         return err;
 369 }
 370
 371 static const struct got_error *
 372 append_object_id(struct got_object_id *id, void *data, void *arg)
 373 {
 374         struct gotd_object_id_array *array = arg;
 375         const size_t alloc_chunksz = 256;
 376
 377         if (array->ids == NULL) {
 378                 array->ids = reallocarray(NULL, alloc_chunksz,
 379                     sizeof(*array->ids));
 380                 if (array->ids == NULL)
 381                         return got_error_from_errno("reallocarray");
 382                 array->nalloc = alloc_chunksz;
 383                 array->nids = 0;
 384         } else if (array->nalloc <= array->nids) {
 385                 struct got_object_id **new;
 386                 new = recallocarray(array->ids, array->nalloc,
 387                     array->nalloc + alloc_chunksz, sizeof(*new));
 388                 if (new == NULL)
 389                         return got_error_from_errno("recallocarray");
 390                 array->ids = new;
 391                 array->nalloc += alloc_chunksz;
 392         }
 393
 394         array->ids[array->nids] = id;
 395         array->nids++;
 396         return NULL;
 397 }
 398
 399 static const struct got_error *
 400 recv_want(struct imsg *imsg)
 401 {
 402         const struct got_error *err;
 403         struct repo_read_client *client = &repo_read_client;
 404         struct gotd_imsg_want iwant;
 405         size_t datalen;
 406         char hex[SHA1_DIGEST_STRING_LENGTH];
 407         struct got_object_id id;
 408         int obj_type;
 409         struct imsgbuf ibuf;
 410
 411         datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 412         if (datalen != sizeof(iwant))
 413                 return got_error(GOT_ERR_PRIVSEP_LEN);
 414         memcpy(&iwant, imsg->data, sizeof(iwant));
 415
 416         memset(&id, 0, sizeof(id));
 417         memcpy(id.sha1, iwant.object_id, SHA1_DIGEST_LENGTH);
 418
 419         if (log_getverbose() > 0 &&
 420             got_object_id_hex(&id, hex, sizeof(hex)))
 421                 log_debug("client wants %s", hex);
 422
 423         imsg_init(&ibuf, client->fd);
 424
 425         err = got_object_get_type(&obj_type, repo_read.repo, &id);
 426         if (err)
 427                 return err;
 428
 429         if (obj_type != GOT_OBJ_TYPE_COMMIT &&
 430             obj_type != GOT_OBJ_TYPE_TAG)
 431                 return got_error(GOT_ERR_OBJ_TYPE);
 432
 433         if (!got_object_idset_contains(client->want_ids, &id)) {
 434                 err = got_object_idset_add(client->want_ids, &id, NULL);
 435                 if (err)
 436                         return err;
 437         }
 438
 439         gotd_imsg_send_ack(&id, &ibuf, PROC_REPO_READ, repo_read.pid);
 440         imsg_clear(&ibuf);
 441         return err;
 442 }
 443
 444 static const struct got_error *
 445 recv_have(struct imsg *imsg)
 446 {
 447         const struct got_error *err;
 448         struct repo_read_client *client = &repo_read_client;
 449         struct gotd_imsg_have ihave;
 450         size_t datalen;
 451         char hex[SHA1_DIGEST_STRING_LENGTH];
 452         struct got_object_id id;
 453         int obj_type;
 454         struct imsgbuf ibuf;
 455
 456         datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 457         if (datalen != sizeof(ihave))
 458                 return got_error(GOT_ERR_PRIVSEP_LEN);
 459         memcpy(&ihave, imsg->data, sizeof(ihave));
 460
 461         memset(&id, 0, sizeof(id));
 462         memcpy(id.sha1, ihave.object_id, SHA1_DIGEST_LENGTH);
 463
 464         if (log_getverbose() > 0 &&
 465             got_object_id_hex(&id, hex, sizeof(hex)))
 466                 log_debug("client has %s", hex);
 467
 468         imsg_init(&ibuf, client->fd);
 469
 470         err = got_object_get_type(&obj_type, repo_read.repo, &id);
 471         if (err) {
 472                 if (err->code == GOT_ERR_NO_OBJ) {
 473                         gotd_imsg_send_nak(&id, &ibuf,
 474                             PROC_REPO_READ, repo_read.pid);
 475                         err = NULL;
 476                 }
 477                 goto done;
 478         }
 479
 480         if (obj_type != GOT_OBJ_TYPE_COMMIT &&
 481             obj_type != GOT_OBJ_TYPE_TAG) {
 482                 gotd_imsg_send_nak(&id, &ibuf, PROC_REPO_READ, repo_read.pid);
 483                 err = got_error(GOT_ERR_OBJ_TYPE);
 484                 goto done;
 485         }
 486
 487         if (!got_object_idset_contains(client->have_ids, &id)) {
 488                 err = got_object_idset_add(client->have_ids, &id, NULL);
 489                 if (err)
 490                         goto done;
 491         }
 492
 493         gotd_imsg_send_ack(&id, &ibuf, PROC_REPO_READ, repo_read.pid);
 494 done:
 495         imsg_clear(&ibuf);
 496         return err;
 497 }
 498
 499 struct repo_read_pack_progress_arg {
 500         int report_progress;
 501         struct imsgbuf *ibuf;
 502         int sent_ready;
 503 };
 504
 505 static const struct got_error *
 506 pack_progress(void *arg, int ncolored, int nfound, int ntrees,
 507     off_t packfile_size, int ncommits, int nobj_total, int nobj_deltify,
 508     int nobj_written)
 509 {
 510         struct repo_read_pack_progress_arg *a = arg;
 511         struct gotd_imsg_packfile_progress iprog;
 512         int ret;
 513
 514         if (!a->report_progress)
 515                 return NULL;
 516         if (packfile_size > 0 && a->sent_ready)
 517                 return NULL;
 518
 519         memset(&iprog, 0, sizeof(iprog));
 520         iprog.ncolored = ncolored;
 521         iprog.nfound = nfound;
 522         iprog.ntrees = ntrees;
 523         iprog.packfile_size = packfile_size;
 524         iprog.ncommits = ncommits;
 525         iprog.nobj_total = nobj_total;
 526         iprog.nobj_deltify = nobj_deltify;
 527         iprog.nobj_written = nobj_written;
 528
 529         /* Using synchronous writes since we are blocking the event loop. */
 530         if (packfile_size == 0) {
 531                 ret = imsg_compose(a->ibuf, GOTD_IMSG_PACKFILE_PROGRESS,
 532                     PROC_REPO_READ, repo_read.pid, -1, &iprog, sizeof(iprog));
 533                 if (ret == -1) {
 534                         return got_error_from_errno("imsg compose "
 535                             "PACKFILE_PROGRESS");
 536                 }
 537         } else {
 538                 a->sent_ready = 1;
 539                 ret = imsg_compose(a->ibuf, GOTD_IMSG_PACKFILE_READY,
 540                     PROC_REPO_READ, repo_read.pid, -1, &iprog, sizeof(iprog));
 541                 if (ret == -1) {
 542                         return got_error_from_errno("imsg compose "
 543                             "PACKFILE_READY");
 544                 }
 545         }
 546
 547         return gotd_imsg_flush(a->ibuf);
 548 }
 549
 550 static const struct got_error *
 551 receive_delta_cache_fd(struct imsg *imsg,
 552     struct gotd_imsgev *iev)
 553 {
 554         struct repo_read_client *client = &repo_read_client;
 555         struct gotd_imsg_send_packfile ireq;
 556         size_t datalen;
 557
 558         log_debug("receiving delta cache file");
 559
 560         datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 561         if (datalen != sizeof(ireq))
 562                 return got_error(GOT_ERR_PRIVSEP_LEN);
 563         memcpy(&ireq, imsg->data, sizeof(ireq));
 564
 565         if (client->delta_cache_fd != -1)
 566                 return got_error(GOT_ERR_PRIVSEP_MSG);
 567
 568         client->delta_cache_fd = imsg_get_fd(imsg);
 569         if (client->delta_cache_fd == -1)
 570                 return got_error(GOT_ERR_PRIVSEP_NO_FD);
 571
 572         client->report_progress = ireq.report_progress;
 573         return NULL;
 574 }
 575
 576 static const struct got_error *
 577 receive_pack_pipe(struct imsg *imsg, struct gotd_imsgev *iev)
 578 {
 579         struct repo_read_client *client = &repo_read_client;
 580         size_t datalen;
 581
 582         log_debug("receiving pack pipe descriptor");
 583
 584         datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 585         if (datalen != 0)
 586                 return got_error(GOT_ERR_PRIVSEP_LEN);
 587
 588         if (client->pack_pipe != -1)
 589                 return got_error(GOT_ERR_PRIVSEP_MSG);
 590
 591         client->pack_pipe = imsg_get_fd(imsg);
 592         if (client->pack_pipe == -1)
 593                 return got_error(GOT_ERR_PRIVSEP_NO_FD);
 594
 595         return NULL;
 596 }
 597
 598 static const struct got_error *
 599 send_packfile(struct imsg *imsg, struct gotd_imsgev *iev)
 600 {
 601         const struct got_error *err = NULL;
 602         struct repo_read_client *client = &repo_read_client;
 603         uint8_t packsha1[SHA1_DIGEST_LENGTH];
 604         char hex[SHA1_DIGEST_STRING_LENGTH];
 605         FILE *delta_cache = NULL;
 606         struct imsgbuf ibuf;
 607         struct repo_read_pack_progress_arg pa;
 608         struct got_ratelimit rl;
 609         struct gotd_object_id_array want_ids;
 610         struct gotd_object_id_array have_ids;
 611
 612         log_debug("packfile request received");
 613
 614         memset(&want_ids, 0, sizeof(want_ids));
 615         memset(&have_ids, 0, sizeof(have_ids));
 616
 617         got_ratelimit_init(&rl, 2, 0);
 618
 619         if (client->delta_cache_fd == -1 || client->pack_pipe == -1)
 620                 return got_error(GOT_ERR_PRIVSEP_NO_FD);
 621
 622         imsg_init(&ibuf, client->fd);
 623
 624         delta_cache = fdopen(client->delta_cache_fd, "w+");
 625         if (delta_cache == NULL) {
 626                 err = got_error_from_errno("fdopen");
 627                 goto done;
 628         }
 629         client->delta_cache_fd = -1;
 630
 631         memset(&pa, 0, sizeof(pa));
 632         pa.ibuf = &ibuf;
 633         pa.report_progress = client->report_progress;
 634
 635         err = got_object_idset_for_each(client->want_ids,
 636             append_object_id, &want_ids);
 637         if (err)
 638                 goto done;
 639         err = got_object_idset_for_each(client->have_ids,
 640            append_object_id, &have_ids);
 641         if (err)
 642                 goto done;
 643
 644         err = got_pack_create(packsha1, client->pack_pipe, delta_cache,
 645             have_ids.ids, have_ids.nids, want_ids.ids, want_ids.nids,
 646             repo_read.repo, 0, 1, 0, pack_progress, &pa, &rl,
 647             check_cancelled, NULL);
 648         if (err)
 649                 goto done;
 650
 651         if (log_getverbose() > 0 &&
 652             got_sha1_digest_to_str(packsha1, hex, sizeof(hex)))
 653                 log_debug("sent pack-%s.pack", hex);
 654
 655         if (gotd_imsg_compose_event(iev, GOTD_IMSG_PACKFILE_DONE,
 656             PROC_REPO_READ, -1, NULL, 0) == -1)
 657                 err = got_error_from_errno("imsg compose PACKFILE_DONE");
 658 done:
 659         if (client->delta_cache_fd != -1 &&
 660             close(client->delta_cache_fd) == -1 && err == NULL)
 661                 err = got_error_from_errno("close");
 662         client->delta_cache_fd = -1;
 663         if (delta_cache != NULL && fclose(delta_cache) == EOF && err == NULL)
 664                 err = got_error_from_errno("fclose");
 665         imsg_clear(&ibuf);
 666         free(want_ids.ids);
 667         free(have_ids.ids);
 668         return err;
 669 }
 670
 671 static void
 672 repo_read_dispatch_session(int fd, short event, void *arg)
 673 {
 674         const struct got_error *err = NULL;
 675         struct gotd_imsgev *iev = arg;
 676         struct imsgbuf *ibuf = &iev->ibuf;
 677         struct imsg imsg;
 678         ssize_t n;
 679         int shut = 0;
 680         struct repo_read_client *client = &repo_read_client;
 681
 682         if (event & EV_READ) {
 683                 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
 684                         fatal("imsg_read error");
 685                 if (n == 0)     /* Connection closed. */
 686                         shut = 1;
 687         }
 688
 689         if (event & EV_WRITE) {
 690                 n = msgbuf_write(&ibuf->w);
 691                 if (n == -1 && errno != EAGAIN)
 692                         fatal("msgbuf_write");
 693                 if (n == 0)     /* Connection closed. */
 694                         shut = 1;
 695         }
 696
 697         while (err == NULL && check_cancelled(NULL) == NULL) {
 698                 if ((n = imsg_get(ibuf, &imsg)) == -1)
 699                         fatal("%s: imsg_get", __func__);
 700                 if (n == 0)     /* No more messages. */
 701                         break;
 702
 703                 if (imsg.hdr.type != GOTD_IMSG_LIST_REFS_INTERNAL &&
 704                     !repo_read.refs_listed) {
 705                         err = got_error(GOT_ERR_PRIVSEP_MSG);
 706                         break;
 707                 }
 708
 709                 switch (imsg.hdr.type) {
 710                 case GOTD_IMSG_LIST_REFS_INTERNAL:
 711                         err = list_refs(&imsg);
 712                         if (err)
 713                                 log_warnx("ls-refs: %s", err->msg);
 714                         break;
 715                 case GOTD_IMSG_WANT:
 716                         err = recv_want(&imsg);
 717                         if (err)
 718                                 log_warnx("want-line: %s", err->msg);
 719                         break;
 720                 case GOTD_IMSG_HAVE:
 721                         err = recv_have(&imsg);
 722                         if (err)
 723                                 log_warnx("have-line: %s", err->msg);
 724                         break;
 725                 case GOTD_IMSG_SEND_PACKFILE:
 726                         err = receive_delta_cache_fd(&imsg, iev);
 727                         if (err)
 728                                 log_warnx("receiving delta cache: %s",
 729                                     err->msg);
 730                         break;
 731                 case GOTD_IMSG_PACKFILE_PIPE:
 732                         err = receive_pack_pipe(&imsg, iev);
 733                         if (err) {
 734                                 log_warnx("receiving pack pipe: %s", err->msg);
 735                                 break;
 736                         }
 737                         err = send_packfile(&imsg, iev);
 738                         if (err)
 739                                 log_warnx("sending packfile: %s", err->msg);
 740                         break;
 741                 default:
 742                         log_debug("unexpected imsg %d", imsg.hdr.type);
 743                         break;
 744                 }
 745
 746                 imsg_free(&imsg);
 747         }
 748
 749         if (!shut && check_cancelled(NULL) == NULL) {
 750                 if (err &&
 751                     gotd_imsg_send_error_event(iev, PROC_REPO_READ,
 752                         client->id, err) == -1) {
 753                         log_warnx("could not send error to parent: %s",
 754                             err->msg);
 755                 }
 756                 gotd_imsg_event_add(iev);
 757         } else {
 758                 /* This pipe is dead. Remove its event handler */
 759                 event_del(&iev->ev);
 760                 event_loopexit(NULL);
 761         }
 762 }
 763
 764 static const struct got_error *
 765 recv_connect(struct imsg *imsg)
 766 {
 767         struct gotd_imsgev *iev = &repo_read.session_iev;
 768         size_t datalen;
 769
 770         datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 771         if (datalen != 0)
 772                 return got_error(GOT_ERR_PRIVSEP_LEN);
 773
 774         if (repo_read.session_fd != -1)
 775                 return got_error(GOT_ERR_PRIVSEP_MSG);
 776
 777         repo_read.session_fd = imsg_get_fd(imsg);
 778         if (repo_read.session_fd == -1)
 779                 return got_error(GOT_ERR_PRIVSEP_NO_FD);
 780
 781         imsg_init(&iev->ibuf, repo_read.session_fd);
 782         iev->handler = repo_read_dispatch_session;
 783         iev->events = EV_READ;
 784         iev->handler_arg = NULL;
 785         event_set(&iev->ev, iev->ibuf.fd, EV_READ,
 786             repo_read_dispatch_session, iev);
 787         gotd_imsg_event_add(iev);
 788
 789         return NULL;
 790 }
 791
 792 static void
 793 repo_read_dispatch(int fd, short event, void *arg)
 794 {
 795         const struct got_error *err = NULL;
 796         struct gotd_imsgev *iev = arg;
 797         struct imsgbuf *ibuf = &iev->ibuf;
 798         struct imsg imsg;
 799         ssize_t n;
 800         int shut = 0;
 801         struct repo_read_client *client = &repo_read_client;
 802
 803         if (event & EV_READ) {
 804                 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
 805                         fatal("imsg_read error");
 806                 if (n == 0)     /* Connection closed. */
 807                         shut = 1;
 808         }
 809
 810         if (event & EV_WRITE) {
 811                 n = msgbuf_write(&ibuf->w);
 812                 if (n == -1 && errno != EAGAIN)
 813                         fatal("msgbuf_write");
 814                 if (n == 0)     /* Connection closed. */
 815                         shut = 1;
 816         }
 817
 818         while (err == NULL && check_cancelled(NULL) == NULL) {
 819                 if ((n = imsg_get(ibuf, &imsg)) == -1)
 820                         fatal("%s: imsg_get", __func__);
 821                 if (n == 0)     /* No more messages. */
 822                         break;
 823
 824                 switch (imsg.hdr.type) {
 825                 case GOTD_IMSG_CONNECT_REPO_CHILD:
 826                         err = recv_connect(&imsg);
 827                         break;
 828                 default:
 829                         log_debug("unexpected imsg %d", imsg.hdr.type);
 830                         break;
 831                 }
 832
 833                 imsg_free(&imsg);
 834         }
 835
 836         if (!shut && check_cancelled(NULL) == NULL) {
 837                 if (err &&
 838                     gotd_imsg_send_error_event(iev, PROC_REPO_READ,
 839                         client->id, err) == -1) {
 840                         log_warnx("could not send error to parent: %s",
 841                             err->msg);
 842                 }
 843                 gotd_imsg_event_add(iev);
 844         } else {
 845                 /* This pipe is dead. Remove its event handler */
 846                 event_del(&iev->ev);
 847                 event_loopexit(NULL);
 848         }
 849 }
 850
 851 void
 852 repo_read_main(const char *title, const char *repo_path,
 853     int *pack_fds, int *temp_fds)
 854 {
 855         const struct got_error *err = NULL;
 856         struct repo_read_client *client = &repo_read_client;
 857         struct gotd_imsgev iev;
 858
 859         client->fd = -1;
 860         client->delta_cache_fd = -1;
 861         client->pack_pipe = -1;
 862         client->have_ids = got_object_idset_alloc();
 863         if (client->have_ids == NULL) {
 864                 err = got_error_from_errno("got_object_idset_alloc");
 865                 goto done;
 866         }
 867         client->want_ids = got_object_idset_alloc();
 868         if (client->want_ids == NULL) {
 869                 err = got_error_from_errno("got_object_idset_alloc");
 870                 goto done;
 871         }
 872
 873         repo_read.title = title;
 874         repo_read.pid = getpid();
 875         repo_read.pack_fds = pack_fds;
 876         repo_read.temp_fds = temp_fds;
 877         repo_read.session_fd = -1;
 878         repo_read.session_iev.ibuf.fd = -1;
 879
 880         err = got_repo_open(&repo_read.repo, repo_path, NULL, pack_fds);
 881         if (err)
 882                 goto done;
 883         if (!got_repo_is_bare(repo_read.repo)) {
 884                 err = got_error_msg(GOT_ERR_NOT_GIT_REPO,
 885                     "bare git repository required");
 886                 goto done;
 887         }
 888
 889         got_repo_temp_fds_set(repo_read.repo, temp_fds);
 890
 891         signal(SIGINT, catch_sigint);
 892         signal(SIGTERM, catch_sigterm);
 893         signal(SIGPIPE, SIG_IGN);
 894         signal(SIGHUP, SIG_IGN);
 895
 896         imsg_init(&iev.ibuf, GOTD_FILENO_MSG_PIPE);
 897         iev.handler = repo_read_dispatch;
 898         iev.events = EV_READ;
 899         iev.handler_arg = NULL;
 900         event_set(&iev.ev, iev.ibuf.fd, EV_READ, repo_read_dispatch, &iev);
 901
 902         if (gotd_imsg_compose_event(&iev, GOTD_IMSG_REPO_CHILD_READY,
 903             PROC_REPO_READ, -1, NULL, 0) == -1) {
 904                 err = got_error_from_errno("imsg compose REPO_CHILD_READY");
 905                 goto done;
 906         }
 907
 908         event_dispatch();
 909 done:
 910         if (err)
 911                 log_warnx("%s: %s", title, err->msg);
 912         repo_read_shutdown();
 913 }
 914
 915 void
 916 repo_read_shutdown(void)
 917 {
 918         struct repo_read_client *client = &repo_read_client;
 919
 920         log_debug("%s: shutting down", repo_read.title);
 921
 922         if (client->have_ids)
 923                 got_object_idset_free(client->have_ids);
 924         if (client->want_ids)
 925                 got_object_idset_free(client->want_ids);
 926         if (client->fd != -1)
 927                 close(client->fd);
 928         if (client->delta_cache_fd != -1)
 929                 close(client->delta_cache_fd);
 930         if (client->pack_pipe != -1)
 931                 close(client->pack_pipe);
 932
 933         if (repo_read.repo)
 934                 got_repo_close(repo_read.repo);
 935         got_repo_pack_fds_close(repo_read.pack_fds);
 936         got_repo_temp_fds_close(repo_read.temp_fds);
 937         if (repo_read.session_fd != -1)
 938                 close(repo_read.session_fd);
 939         exit(0);
 940 }