lib/object_create.c

   1 /*
   2  * Copyright (c) 2019 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/types.h>
  20 #include <sys/stat.h>
  21 #include <sys/queue.h>
  22 #include <sys/wait.h>
  23
  24 #include <ctype.h>
  25 #include <errno.h>
  26 #include <fcntl.h>
  27 #include <limits.h>
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <stdint.h>
  32 #include <unistd.h>
  33 #include <zlib.h>
  34
  35 #include "got_error.h"
  36 #include "got_object.h"
  37 #include "got_repository.h"
  38 #include "got_opentemp.h"
  39 #include "got_path.h"
  40 #include "got_sigs.h"
  41
  42 #include "got_lib_hash.h"
  43 #include "got_lib_deflate.h"
  44 #include "got_lib_delta.h"
  45 #include "got_lib_object.h"
  46 #include "got_lib_object_parse.h"
  47 #include "got_lib_lockfile.h"
  48
  49 #include "got_lib_object_create.h"
  50
  51 #include "buf.h"
  52
  53 #ifndef nitems
  54 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
  55 #endif
  56
  57 static const struct got_error *
  58 create_object_file(struct got_object_id *id, FILE *content,
  59     off_t content_len, struct got_repository *repo)
  60 {
  61         const struct got_error *err = NULL, *unlock_err = NULL;
  62         char *objpath = NULL, *tmppath = NULL;
  63         FILE *tmpfile = NULL;
  64         struct got_lockfile *lf = NULL;
  65         off_t tmplen = 0;
  66
  67         err = got_object_get_path(&objpath, id, repo);
  68         if (err)
  69                 return err;
  70
  71         err = got_opentemp_named(&tmppath, &tmpfile, objpath, "");
  72         if (err) {
  73                 char *parent_path;
  74                 if (!(err->code == GOT_ERR_ERRNO && errno == ENOENT))
  75                         goto done;
  76                 err = got_path_dirname(&parent_path, objpath);
  77                 if (err)
  78                         goto done;
  79                 err = got_path_mkdir(parent_path);
  80                 free(parent_path);
  81                 if (err)
  82                         goto done;
  83                 err = got_opentemp_named(&tmppath, &tmpfile, objpath, "");
  84                 if (err)
  85                         goto done;
  86         }
  87
  88         if (fchmod(fileno(tmpfile), GOT_DEFAULT_FILE_MODE) != 0) {
  89                 err = got_error_from_errno2("fchmod", tmppath);
  90                 goto done;
  91         }
  92
  93         err = got_deflate_to_file(&tmplen, content, content_len, tmpfile, NULL);
  94         if (err)
  95                 goto done;
  96
  97         err = got_lockfile_lock(&lf, objpath, -1);
  98         if (err)
  99                 goto done;
 100
 101         if (rename(tmppath, objpath) != 0) {
 102                 err = got_error_from_errno3("rename", tmppath, objpath);
 103                 goto done;
 104         }
 105         free(tmppath);
 106         tmppath = NULL;
 107 done:
 108         free(objpath);
 109         if (tmppath) {
 110                 if (unlink(tmppath) != 0 && err == NULL)
 111                         err = got_error_from_errno2("unlink", tmppath);
 112                 free(tmppath);
 113         }
 114         if (tmpfile && fclose(tmpfile) == EOF && err == NULL)
 115                 err = got_error_from_errno("fclose");
 116         if (lf)
 117                 unlock_err = got_lockfile_unlock(lf, -1);
 118         return err ? err : unlock_err;
 119 }
 120
 121 const struct got_error *
 122 got_object_blob_file_create(struct got_object_id **id, FILE **blobfile,
 123     off_t *blobsize, const char *ondisk_path)
 124 {
 125         const struct got_error *err = NULL;
 126         char *header = NULL;
 127         int fd = -1;
 128         struct stat sb;
 129         struct got_hash ctx;
 130         size_t headerlen = 0, n;
 131
 132         *id = NULL;
 133         *blobfile = NULL;
 134         *blobsize = 0;
 135
 136         got_hash_init(&ctx, GOT_HASH_SHA1);
 137
 138         fd = open(ondisk_path, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
 139         if (fd == -1) {
 140                 if (!got_err_open_nofollow_on_symlink())
 141                         return got_error_from_errno2("open", ondisk_path);
 142
 143                 if (lstat(ondisk_path, &sb) == -1) {
 144                         err = got_error_from_errno2("lstat", ondisk_path);
 145                         goto done;
 146                 }
 147         } else if (fstat(fd, &sb) == -1) {
 148                 err = got_error_from_errno2("fstat", ondisk_path);
 149                 goto done;
 150         }
 151
 152         if (asprintf(&header, "%s %lld", GOT_OBJ_LABEL_BLOB,
 153                 (long long)sb.st_size) == -1) {
 154                 err = got_error_from_errno("asprintf");
 155                 goto done;
 156         }
 157         headerlen = strlen(header) + 1;
 158         got_hash_update(&ctx, header, headerlen);
 159
 160         *blobfile = got_opentemp();
 161         if (*blobfile == NULL) {
 162                 err = got_error_from_errno("got_opentemp");
 163                 goto done;
 164         }
 165
 166         n = fwrite(header, 1, headerlen, *blobfile);
 167         if (n != headerlen) {
 168                 err = got_ferror(*blobfile, GOT_ERR_IO);
 169                 goto done;
 170         }
 171         *blobsize += headerlen;
 172         for (;;) {
 173                 char buf[PATH_MAX * 8];
 174                 ssize_t inlen;
 175
 176                 if (S_ISLNK(sb.st_mode)) {
 177                         inlen = readlink(ondisk_path, buf, sizeof(buf));
 178                         if (inlen == -1) {
 179                                 err = got_error_from_errno("readlink");
 180                                 goto done;
 181                         }
 182                 } else {
 183                         inlen = read(fd, buf, sizeof(buf));
 184                         if (inlen == -1) {
 185                                 err = got_error_from_errno("read");
 186                                 goto done;
 187                         }
 188                 }
 189                 if (inlen == 0)
 190                         break; /* EOF */
 191                 got_hash_update(&ctx, buf, inlen);
 192                 n = fwrite(buf, 1, inlen, *blobfile);
 193                 if (n != inlen) {
 194                         err = got_ferror(*blobfile, GOT_ERR_IO);
 195                         goto done;
 196                 }
 197                 *blobsize += n;
 198                 if (S_ISLNK(sb.st_mode))
 199                         break;
 200         }
 201
 202         *id = calloc(1, sizeof(**id));
 203         if (*id == NULL) {
 204                 err = got_error_from_errno("calloc");
 205                 goto done;
 206         }
 207         got_hash_final_object_id(&ctx, *id);
 208
 209         if (fflush(*blobfile) != 0) {
 210                 err = got_error_from_errno("fflush");
 211                 goto done;
 212         }
 213         rewind(*blobfile);
 214 done:
 215         free(header);
 216         if (fd != -1 && close(fd) == -1 && err == NULL)
 217                 err = got_error_from_errno("close");
 218         if (err) {
 219                 free(*id);
 220                 *id = NULL;
 221                 if (*blobfile) {
 222                         fclose(*blobfile);
 223                         *blobfile = NULL;
 224                 }
 225         }
 226         return err;
 227 }
 228
 229 const struct got_error *
 230 got_object_blob_create(struct got_object_id **id, const char *ondisk_path,
 231     struct got_repository *repo)
 232 {
 233         const struct got_error *err = NULL;
 234         FILE *blobfile = NULL;
 235         off_t blobsize;
 236
 237         err = got_object_blob_file_create(id, &blobfile, &blobsize,
 238             ondisk_path);
 239         if (err)
 240                 return err;
 241
 242         err = create_object_file(*id, blobfile, blobsize, repo);
 243         if (fclose(blobfile) == EOF && err == NULL)
 244                 err = got_error_from_errno("fclose");
 245         if (err) {
 246                 free(*id);
 247                 *id = NULL;
 248         }
 249         return err;
 250 }
 251
 252 static const struct got_error *
 253 te_mode2str(char *buf, size_t len, struct got_tree_entry *te)
 254 {
 255         int ret;
 256         mode_t mode;
 257
 258         /*
 259          * Some Git implementations are picky about modes seen in tree entries.
 260          * For best compatibility we normalize the file/directory mode here.
 261          */
 262         if (S_ISREG(te->mode)) {
 263                 mode = GOT_DEFAULT_FILE_MODE;
 264                 if (te->mode & (S_IXUSR | S_IXGRP | S_IXOTH))
 265                         mode |= S_IXUSR | S_IXGRP | S_IXOTH;
 266         } else if (got_object_tree_entry_is_submodule(te))
 267                 mode = S_IFDIR | S_IFLNK;
 268         else if (S_ISLNK(te->mode))
 269                 mode = S_IFLNK; /* Git leaves all the other bits unset. */
 270         else if (S_ISDIR(te->mode))
 271                 mode = S_IFDIR; /* Git leaves all the other bits unset. */
 272         else
 273                 return got_error(GOT_ERR_BAD_FILETYPE);
 274
 275         ret = snprintf(buf, len, "%o ", mode);
 276         if (ret < 0 || (size_t)ret >= len)
 277                 return got_error(GOT_ERR_NO_SPACE);
 278         return NULL;
 279 }
 280
 281 /*
 282  * Git expects directory tree entries to be sorted with an imaginary slash
 283  * appended to their name, and will break otherwise. Let's be nice.
 284  * This function is intended to be used with mergesort(3) to sort an
 285  * array of pointers to struct got_tree_entry objects.
 286  */
 287 static int
 288 sort_tree_entries_the_way_git_likes_it(const void *arg1, const void *arg2)
 289 {
 290         struct got_tree_entry * const *te1 = arg1;
 291         struct got_tree_entry * const *te2 = arg2;
 292         char name1[NAME_MAX + 2];
 293         char name2[NAME_MAX + 2];
 294
 295         strlcpy(name1, (*te1)->name, sizeof(name1));
 296         strlcpy(name2, (*te2)->name, sizeof(name2));
 297         if (S_ISDIR((*te1)->mode))
 298                 strlcat(name1, "/", sizeof(name1));
 299         if (S_ISDIR((*te2)->mode))
 300                 strlcat(name2, "/", sizeof(name2));
 301         return strcmp(name1, name2);
 302 }
 303
 304 const struct got_error *
 305 got_object_tree_create(struct got_object_id **id,
 306     struct got_pathlist_head *paths, int nentries, struct got_repository *repo)
 307 {
 308         const struct got_error *err = NULL;
 309         char modebuf[sizeof("100644 ")];
 310         struct got_hash ctx;
 311         char *header = NULL;
 312         size_t headerlen, len = 0, n;
 313         FILE *treefile = NULL;
 314         off_t treesize = 0;
 315         struct got_pathlist_entry *pe;
 316         struct got_tree_entry **sorted_entries;
 317         struct got_tree_entry *te;
 318         int i;
 319
 320         *id = NULL;
 321
 322         got_hash_init(&ctx, GOT_HASH_SHA1);
 323
 324         sorted_entries = calloc(nentries, sizeof(struct got_tree_entry *));
 325         if (sorted_entries == NULL)
 326                 return got_error_from_errno("calloc");
 327
 328         i = 0;
 329         TAILQ_FOREACH(pe, paths, entry)
 330                 sorted_entries[i++] = pe->data;
 331         mergesort(sorted_entries, nentries, sizeof(struct got_tree_entry *),
 332             sort_tree_entries_the_way_git_likes_it);
 333
 334         for (i = 0; i < nentries; i++) {
 335                 te = sorted_entries[i];
 336                 err = te_mode2str(modebuf, sizeof(modebuf), te);
 337                 if (err)
 338                         goto done;
 339                 len += strlen(modebuf) + strlen(te->name) + 1 +
 340                     SHA1_DIGEST_LENGTH;
 341         }
 342
 343         if (asprintf(&header, "%s %zd", GOT_OBJ_LABEL_TREE, len) == -1) {
 344                 err = got_error_from_errno("asprintf");
 345                 goto done;
 346         }
 347         headerlen = strlen(header) + 1;
 348         got_hash_update(&ctx, header, headerlen);
 349
 350         treefile = got_opentemp();
 351         if (treefile == NULL) {
 352                 err = got_error_from_errno("got_opentemp");
 353                 goto done;
 354         }
 355
 356         n = fwrite(header, 1, headerlen, treefile);
 357         if (n != headerlen) {
 358                 err = got_ferror(treefile, GOT_ERR_IO);
 359                 goto done;
 360         }
 361         treesize += headerlen;
 362
 363         for (i = 0; i < nentries; i++) {
 364                 te = sorted_entries[i];
 365                 err = te_mode2str(modebuf, sizeof(modebuf), te);
 366                 if (err)
 367                         goto done;
 368                 len = strlen(modebuf);
 369                 n = fwrite(modebuf, 1, len, treefile);
 370                 if (n != len) {
 371                         err = got_ferror(treefile, GOT_ERR_IO);
 372                         goto done;
 373                 }
 374                 got_hash_update(&ctx, modebuf, len);
 375                 treesize += n;
 376
 377                 len = strlen(te->name) + 1; /* must include NUL */
 378                 n = fwrite(te->name, 1, len, treefile);
 379                 if (n != len) {
 380                         err = got_ferror(treefile, GOT_ERR_IO);
 381                         goto done;
 382                 }
 383                 got_hash_update(&ctx, te->name, len);
 384                 treesize += n;
 385
 386                 len = SHA1_DIGEST_LENGTH;
 387                 n = fwrite(te->id.sha1, 1, len, treefile);
 388                 if (n != len) {
 389                         err = got_ferror(treefile, GOT_ERR_IO);
 390                         goto done;
 391                 }
 392                 got_hash_update(&ctx, te->id.sha1, len);
 393                 treesize += n;
 394         }
 395
 396         *id = calloc(1, sizeof(**id));
 397         if (*id == NULL) {
 398                 err = got_error_from_errno("calloc");
 399                 goto done;
 400         }
 401         got_hash_final_object_id(&ctx, *id);
 402
 403         if (fflush(treefile) != 0) {
 404                 err = got_error_from_errno("fflush");
 405                 goto done;
 406         }
 407         rewind(treefile);
 408
 409         err = create_object_file(*id, treefile, treesize, repo);
 410 done:
 411         free(header);
 412         free(sorted_entries);
 413         if (treefile && fclose(treefile) == EOF && err == NULL)
 414                 err = got_error_from_errno("fclose");
 415         if (err) {
 416                 free(*id);
 417                 *id = NULL;
 418         }
 419         return err;
 420 }
 421
 422 const struct got_error *
 423 got_object_commit_create(struct got_object_id **id,
 424     struct got_object_id *tree_id, struct got_object_id_queue *parent_ids,
 425     int nparents, const char *author, time_t author_time,
 426     const char *committer, time_t committer_time,
 427     const char *logmsg, struct got_repository *repo)
 428 {
 429         const struct got_error *err = NULL;
 430         struct got_hash ctx;
 431         char *header = NULL, *tree_str = NULL;
 432         char *author_str = NULL, *committer_str = NULL;
 433         char *id_str = NULL;
 434         size_t headerlen, len = 0, n;
 435         FILE *commitfile = NULL;
 436         off_t commitsize = 0;
 437         struct got_object_qid *qid;
 438         char *msg0, *msg;
 439
 440         *id = NULL;
 441
 442         got_hash_init(&ctx, GOT_HASH_SHA1);
 443
 444         msg0 = strdup(logmsg);
 445         if (msg0 == NULL)
 446                 return got_error_from_errno("strdup");
 447         msg = msg0;
 448
 449         while (isspace((unsigned char)msg[0]))
 450                 msg++;
 451         len = strlen(msg);
 452         while (len > 0 && isspace((unsigned char)msg[len - 1])) {
 453                 msg[len - 1] = '\0';
 454                 len--;
 455         }
 456
 457         if (asprintf(&author_str, "%s%s %lld +0000\n",
 458             GOT_COMMIT_LABEL_AUTHOR, author, (long long)author_time) == -1) {
 459                 err = got_error_from_errno("asprintf");
 460                 goto done;
 461         }
 462
 463         if (asprintf(&committer_str, "%s%s %lld +0000\n",
 464             GOT_COMMIT_LABEL_COMMITTER, committer ? committer : author,
 465             (long long)(committer ? committer_time : author_time))
 466             == -1) {
 467                 err = got_error_from_errno("asprintf");
 468                 goto done;
 469         }
 470
 471         len = strlen(GOT_COMMIT_LABEL_TREE) + SHA1_DIGEST_STRING_LENGTH +
 472             nparents *
 473             (strlen(GOT_COMMIT_LABEL_PARENT) + SHA1_DIGEST_STRING_LENGTH) +
 474             + strlen(author_str) + strlen(committer_str) + 2 + strlen(msg);
 475
 476         if (asprintf(&header, "%s %zd", GOT_OBJ_LABEL_COMMIT, len) == -1) {
 477                 err = got_error_from_errno("asprintf");
 478                 goto done;
 479         }
 480         headerlen = strlen(header) + 1;
 481         got_hash_update(&ctx, header, headerlen);
 482
 483         commitfile = got_opentemp();
 484         if (commitfile == NULL) {
 485                 err = got_error_from_errno("got_opentemp");
 486                 goto done;
 487         }
 488
 489         n = fwrite(header, 1, headerlen, commitfile);
 490         if (n != headerlen) {
 491                 err = got_ferror(commitfile, GOT_ERR_IO);
 492                 goto done;
 493         }
 494         commitsize += headerlen;
 495
 496         err = got_object_id_str(&id_str, tree_id);
 497         if (err)
 498                 goto done;
 499         if (asprintf(&tree_str, "%s%s\n", GOT_COMMIT_LABEL_TREE, id_str)
 500             == -1) {
 501                 err = got_error_from_errno("asprintf");
 502                 goto done;
 503         }
 504         len = strlen(tree_str);
 505         got_hash_update(&ctx, tree_str, len);
 506         n = fwrite(tree_str, 1, len, commitfile);
 507         if (n != len) {
 508                 err = got_ferror(commitfile, GOT_ERR_IO);
 509                 goto done;
 510         }
 511         commitsize += n;
 512
 513         if (parent_ids) {
 514                 free(id_str);
 515                 id_str = NULL;
 516                 STAILQ_FOREACH(qid, parent_ids, entry) {
 517                         char *parent_str = NULL;
 518
 519                         err = got_object_id_str(&id_str, &qid->id);
 520                         if (err)
 521                                 goto done;
 522                         if (asprintf(&parent_str, "%s%s\n",
 523                             GOT_COMMIT_LABEL_PARENT, id_str) == -1) {
 524                                 err = got_error_from_errno("asprintf");
 525                                 goto done;
 526                         }
 527                         len = strlen(parent_str);
 528                         got_hash_update(&ctx, parent_str, len);
 529                         n = fwrite(parent_str, 1, len, commitfile);
 530                         if (n != len) {
 531                                 err = got_ferror(commitfile, GOT_ERR_IO);
 532                                 free(parent_str);
 533                                 goto done;
 534                         }
 535                         commitsize += n;
 536                         free(parent_str);
 537                         free(id_str);
 538                         id_str = NULL;
 539                 }
 540         }
 541
 542         len = strlen(author_str);
 543         got_hash_update(&ctx, author_str, len);
 544         n = fwrite(author_str, 1, len, commitfile);
 545         if (n != len) {
 546                 err = got_ferror(commitfile, GOT_ERR_IO);
 547                 goto done;
 548         }
 549         commitsize += n;
 550
 551         len = strlen(committer_str);
 552         got_hash_update(&ctx, committer_str, len);
 553         n = fwrite(committer_str, 1, len, commitfile);
 554         if (n != len) {
 555                 err = got_ferror(commitfile, GOT_ERR_IO);
 556                 goto done;
 557         }
 558         commitsize += n;
 559
 560         got_hash_update(&ctx, "\n", 1);
 561         n = fwrite("\n", 1, 1, commitfile);
 562         if (n != 1) {
 563                 err = got_ferror(commitfile, GOT_ERR_IO);
 564                 goto done;
 565         }
 566         commitsize += n;
 567
 568         len = strlen(msg);
 569         got_hash_update(&ctx, msg, len);
 570         n = fwrite(msg, 1, len, commitfile);
 571         if (n != len) {
 572                 err = got_ferror(commitfile, GOT_ERR_IO);
 573                 goto done;
 574         }
 575         commitsize += n;
 576
 577         got_hash_update(&ctx, "\n", 1);
 578         n = fwrite("\n", 1, 1, commitfile);
 579         if (n != 1) {
 580                 err = got_ferror(commitfile, GOT_ERR_IO);
 581                 goto done;
 582         }
 583         commitsize += n;
 584
 585         *id = calloc(1, sizeof(**id));
 586         if (*id == NULL) {
 587                 err = got_error_from_errno("calloc");
 588                 goto done;
 589         }
 590         got_hash_final_object_id(&ctx, *id);
 591
 592         if (fflush(commitfile) != 0) {
 593                 err = got_error_from_errno("fflush");
 594                 goto done;
 595         }
 596         rewind(commitfile);
 597
 598         err = create_object_file(*id, commitfile, commitsize, repo);
 599 done:
 600         free(id_str);
 601         free(msg0);
 602         free(header);
 603         free(tree_str);
 604         free(author_str);
 605         free(committer_str);
 606         if (commitfile && fclose(commitfile) == EOF && err == NULL)
 607                 err = got_error_from_errno("fclose");
 608         if (err) {
 609                 free(*id);
 610                 *id = NULL;
 611         }
 612         return err;
 613 }
 614
 615 const struct got_error *
 616 got_object_tag_create(struct got_object_id **id,
 617     const char *tag_name, struct got_object_id *object_id, const char *tagger,
 618     time_t tagger_time, const char *tagmsg, const char *signer_id,
 619     struct got_repository *repo, int verbosity)
 620 {
 621         const struct got_error *err = NULL;
 622         struct got_hash ctx;
 623         char *header = NULL;
 624         char *tag_str = NULL, *tagger_str = NULL;
 625         char *id_str = NULL, *obj_str = NULL, *type_str = NULL;
 626         size_t headerlen, len = 0, sig_len = 0, n;
 627         FILE *tagfile = NULL;
 628         off_t tagsize = 0;
 629         char *msg0 = NULL, *msg;
 630         const char *obj_type_str;
 631         int obj_type;
 632         BUF *buf = NULL;
 633
 634         *id = NULL;
 635
 636         got_hash_init(&ctx, GOT_HASH_SHA1);
 637
 638         err = got_object_id_str(&id_str, object_id);
 639         if (err)
 640                 goto done;
 641         if (asprintf(&obj_str, "%s%s\n", GOT_TAG_LABEL_OBJECT, id_str) == -1) {
 642                 err = got_error_from_errno("asprintf");
 643                 goto done;
 644         }
 645
 646         err = got_object_get_type(&obj_type, repo, object_id);
 647         if (err)
 648                 goto done;
 649
 650         switch (obj_type) {
 651         case GOT_OBJ_TYPE_BLOB:
 652                 obj_type_str = GOT_OBJ_LABEL_BLOB;
 653                 break;
 654         case GOT_OBJ_TYPE_TREE:
 655                 obj_type_str = GOT_OBJ_LABEL_TREE;
 656                 break;
 657         case GOT_OBJ_TYPE_COMMIT:
 658                 obj_type_str = GOT_OBJ_LABEL_COMMIT;
 659                 break;
 660         case GOT_OBJ_TYPE_TAG:
 661                 obj_type_str = GOT_OBJ_LABEL_TAG;
 662                 break;
 663         default:
 664                 err = got_error(GOT_ERR_OBJ_TYPE);
 665                 goto done;
 666         }
 667
 668         if (asprintf(&type_str, "%s%s\n", GOT_TAG_LABEL_TYPE,
 669             obj_type_str) == -1) {
 670                 err = got_error_from_errno("asprintf");
 671                 goto done;
 672         }
 673
 674         if (asprintf(&tag_str, "%s%s\n", GOT_TAG_LABEL_TAG, tag_name) == -1) {
 675                 err = got_error_from_errno("asprintf");
 676                 goto done;
 677         }
 678
 679         if (asprintf(&tagger_str, "%s%s %lld +0000\n",
 680             GOT_TAG_LABEL_TAGGER, tagger, (long long)tagger_time) == -1)
 681                 return got_error_from_errno("asprintf");
 682
 683         msg0 = strdup(tagmsg);
 684         if (msg0 == NULL) {
 685                 err = got_error_from_errno("strdup");
 686                 goto done;
 687         }
 688         msg = msg0;
 689
 690         while (isspace((unsigned char)msg[0]))
 691                 msg++;
 692
 693         if (signer_id) {
 694                 pid_t pid;
 695                 size_t len;
 696                 int in_fd, out_fd;
 697                 int status;
 698
 699                 err = buf_alloc(&buf, 0);
 700                 if (err)
 701                         goto done;
 702
 703                 /* signed message */
 704                 err = buf_puts(&len, buf, obj_str);
 705                 if (err)
 706                         goto done;
 707                 err = buf_puts(&len, buf, type_str);
 708                 if (err)
 709                         goto done;
 710                 err = buf_puts(&len, buf, tag_str);
 711                 if (err)
 712                         goto done;
 713                 err = buf_puts(&len, buf, tagger_str);
 714                 if (err)
 715                         goto done;
 716                 err = buf_putc(buf, '\n');
 717                 if (err)
 718                         goto done;
 719                 err = buf_puts(&len, buf, msg);
 720                 if (err)
 721                         goto done;
 722                 err = buf_putc(buf, '\n');
 723                 if (err)
 724                         goto done;
 725
 726                 err = got_sigs_sign_tag_ssh(&pid, &in_fd, &out_fd, signer_id,
 727                     verbosity);
 728                 if (err)
 729                         goto done;
 730                 if (buf_write_fd(buf, in_fd) == -1) {
 731                         err = got_error_from_errno("write");
 732                         goto done;
 733                 }
 734                 if (close(in_fd) == -1) {
 735                         err = got_error_from_errno("close");
 736                         goto done;
 737                 }
 738
 739                 if (waitpid(pid, &status, 0) == -1) {
 740                         err = got_error_from_errno("waitpid");
 741                         goto done;
 742                 }
 743                 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
 744                         err = got_error(GOT_ERR_SIGNING_TAG);
 745                         goto done;
 746                 }
 747
 748                 buf_empty(buf);
 749                 err = buf_load_fd(&buf, out_fd);
 750                 if (err)
 751                         goto done;
 752                 sig_len = buf_len(buf);
 753                 if (close(out_fd) == -1) {
 754                         err = got_error_from_errno("close");
 755                         goto done;
 756                 }
 757         }
 758
 759         len = strlen(obj_str) + strlen(type_str) + strlen(tag_str) +
 760             strlen(tagger_str) + 1 + strlen(msg) + 1 + sig_len;
 761         if (asprintf(&header, "%s %zd", GOT_OBJ_LABEL_TAG, len) == -1) {
 762                 err = got_error_from_errno("asprintf");
 763                 goto done;
 764         }
 765
 766         headerlen = strlen(header) + 1;
 767         got_hash_update(&ctx, header, headerlen);
 768
 769         tagfile = got_opentemp();
 770         if (tagfile == NULL) {
 771                 err = got_error_from_errno("got_opentemp");
 772                 goto done;
 773         }
 774
 775         n = fwrite(header, 1, headerlen, tagfile);
 776         if (n != headerlen) {
 777                 err = got_ferror(tagfile, GOT_ERR_IO);
 778                 goto done;
 779         }
 780         tagsize += headerlen;
 781         len = strlen(obj_str);
 782         got_hash_update(&ctx, obj_str, len);
 783         n = fwrite(obj_str, 1, len, tagfile);
 784         if (n != len) {
 785                 err = got_ferror(tagfile, GOT_ERR_IO);
 786                 goto done;
 787         }
 788         tagsize += n;
 789         len = strlen(type_str);
 790         got_hash_update(&ctx, type_str, len);
 791         n = fwrite(type_str, 1, len, tagfile);
 792         if (n != len) {
 793                 err = got_ferror(tagfile, GOT_ERR_IO);
 794                 goto done;
 795         }
 796         tagsize += n;
 797
 798         len = strlen(tag_str);
 799         got_hash_update(&ctx, tag_str, len);
 800         n = fwrite(tag_str, 1, len, tagfile);
 801         if (n != len) {
 802                 err = got_ferror(tagfile, GOT_ERR_IO);
 803                 goto done;
 804         }
 805         tagsize += n;
 806
 807         len = strlen(tagger_str);
 808         got_hash_update(&ctx, tagger_str, len);
 809         n = fwrite(tagger_str, 1, len, tagfile);
 810         if (n != len) {
 811                 err = got_ferror(tagfile, GOT_ERR_IO);
 812                 goto done;
 813         }
 814         tagsize += n;
 815
 816         got_hash_update(&ctx, "\n", 1);
 817         n = fwrite("\n", 1, 1, tagfile);
 818         if (n != 1) {
 819                 err = got_ferror(tagfile, GOT_ERR_IO);
 820                 goto done;
 821         }
 822         tagsize += n;
 823
 824         len = strlen(msg);
 825         got_hash_update(&ctx, msg, len);
 826         n = fwrite(msg, 1, len, tagfile);
 827         if (n != len) {
 828                 err = got_ferror(tagfile, GOT_ERR_IO);
 829                 goto done;
 830         }
 831         tagsize += n;
 832
 833         got_hash_update(&ctx, "\n", 1);
 834         n = fwrite("\n", 1, 1, tagfile);
 835         if (n != 1) {
 836                 err = got_ferror(tagfile, GOT_ERR_IO);
 837                 goto done;
 838         }
 839         tagsize += n;
 840
 841         if (signer_id && buf_len(buf) > 0) {
 842                 len = buf_len(buf);
 843                 got_hash_update(&ctx, buf_get(buf), len);
 844                 n = fwrite(buf_get(buf), 1, len, tagfile);
 845                 if (n != len) {
 846                         err = got_ferror(tagfile, GOT_ERR_IO);
 847                         goto done;
 848                 }
 849                 tagsize += n;
 850         }
 851
 852         *id = calloc(1, sizeof(**id));
 853         if (*id == NULL) {
 854                 err = got_error_from_errno("calloc");
 855                 goto done;
 856         }
 857         got_hash_final_object_id(&ctx, *id);
 858
 859         if (fflush(tagfile) != 0) {
 860                 err = got_error_from_errno("fflush");
 861                 goto done;
 862         }
 863         rewind(tagfile);
 864
 865         err = create_object_file(*id, tagfile, tagsize, repo);
 866 done:
 867         free(msg0);
 868         free(header);
 869         free(obj_str);
 870         free(tagger_str);
 871         if (buf)
 872                 buf_release(buf);
 873         if (tagfile && fclose(tagfile) == EOF && err == NULL)
 874                 err = got_error_from_errno("fclose");
 875         if (err) {
 876                 free(*id);
 877                 *id = NULL;
 878         }
 879         return err;
 880 }