usr.bin/xinstall/xinstall.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 2012, 2013 SRI International
   5  * Copyright (c) 1987, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #ifndef lint
  34 static const char copyright[] =
  35 "@(#) Copyright (c) 1987, 1993\n\
  36         The Regents of the University of California.  All rights reserved.\n";
  37 #endif /* not lint */
  38
  39 #if 0
  40 #ifndef lint
  41 static char sccsid[] = "@(#)xinstall.c  8.1 (Berkeley) 7/21/93";
  42 #endif /* not lint */
  43 #endif
  44
  45 #include <sys/cdefs.h>
  46 __FBSDID("$FreeBSD$");
  47
  48 #include <sys/param.h>
  49 #include <sys/mman.h>
  50 #include <sys/mount.h>
  51 #include <sys/stat.h>
  52 #include <sys/time.h>
  53 #include <sys/wait.h>
  54
  55 #include <err.h>
  56 #include <errno.h>
  57 #include <fcntl.h>
  58 #include <grp.h>
  59 #include <libgen.h>
  60 #include <md5.h>
  61 #include <paths.h>
  62 #include <pwd.h>
  63 #include <ripemd.h>
  64 #include <sha.h>
  65 #include <sha256.h>
  66 #include <sha512.h>
  67 #include <spawn.h>
  68 #include <stdint.h>
  69 #include <stdio.h>
  70 #include <stdlib.h>
  71 #include <string.h>
  72 #include <sysexits.h>
  73 #include <unistd.h>
  74 #include <vis.h>
  75
  76 #include "mtree.h"
  77
  78 #define MAX_CMP_SIZE    (16 * 1024 * 1024)
  79
  80 #define LN_ABSOLUTE     0x01
  81 #define LN_RELATIVE     0x02
  82 #define LN_HARD         0x04
  83 #define LN_SYMBOLIC     0x08
  84 #define LN_MIXED        0x10
  85
  86 #define DIRECTORY       0x01            /* Tell install it's a directory. */
  87 #define SETFLAGS        0x02            /* Tell install to set flags. */
  88 #define NOCHANGEBITS    (UF_IMMUTABLE | UF_APPEND | SF_IMMUTABLE | SF_APPEND)
  89 #define BACKUP_SUFFIX   ".old"
  90
  91 typedef union {
  92         MD5_CTX         MD5;
  93         RIPEMD160_CTX   RIPEMD160;
  94         SHA1_CTX        SHA1;
  95         SHA256_CTX      SHA256;
  96         SHA512_CTX      SHA512;
  97 }       DIGEST_CTX;
  98
  99 static enum {
 100         DIGEST_NONE = 0,
 101         DIGEST_MD5,
 102         DIGEST_RIPEMD160,
 103         DIGEST_SHA1,
 104         DIGEST_SHA256,
 105         DIGEST_SHA512,
 106 } digesttype = DIGEST_NONE;
 107
 108 extern char **environ;
 109
 110 static gid_t gid;
 111 static uid_t uid;
 112 static int dobackup, docompare, dodir, dolink, dopreserve, dostrip, dounpriv,
 113     safecopy, verbose;
 114 static int haveopt_f, haveopt_g, haveopt_m, haveopt_o;
 115 static mode_t mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
 116 static FILE *metafp;
 117 static const char *group, *owner;
 118 static const char *suffix = BACKUP_SUFFIX;
 119 static char *destdir, *digest, *fflags, *metafile, *tags;
 120
 121 static int      compare(int, const char *, size_t, int, const char *, size_t,
 122                     char **);
 123 static char     *copy(int, const char *, int, const char *, off_t);
 124 static int      create_newfile(const char *, int, struct stat *);
 125 static int      create_tempfile(const char *, char *, size_t);
 126 static char     *quiet_mktemp(char *template);
 127 static char     *digest_file(const char *);
 128 static void     digest_init(DIGEST_CTX *);
 129 static void     digest_update(DIGEST_CTX *, const char *, size_t);
 130 static char     *digest_end(DIGEST_CTX *, char *);
 131 static int      do_link(const char *, const char *, const struct stat *);
 132 static void     do_symlink(const char *, const char *, const struct stat *);
 133 static void     makelink(const char *, const char *, const struct stat *);
 134 static void     install(const char *, const char *, u_long, u_int);
 135 static void     install_dir(char *);
 136 static void     metadata_log(const char *, const char *, struct timespec *,
 137                     const char *, const char *, off_t);
 138 static int      parseid(const char *, id_t *);
 139 static int      strip(const char *, int, const char *, char **);
 140 static int      trymmap(int);
 141 static void     usage(void);
 142
 143 int
 144 main(int argc, char *argv[])
 145 {
 146         struct stat from_sb, to_sb;
 147         mode_t *set;
 148         u_long fset;
 149         int ch, no_target;
 150         u_int iflags;
 151         char *p;
 152         const char *to_name;
 153
 154         fset = 0;
 155         iflags = 0;
 156         group = owner = NULL;
 157         while ((ch = getopt(argc, argv, "B:bCcD:df:g:h:l:M:m:N:o:pSsT:Uv")) !=
 158              -1)
 159                 switch((char)ch) {
 160                 case 'B':
 161                         suffix = optarg;
 162                         /* FALLTHROUGH */
 163                 case 'b':
 164                         dobackup = 1;
 165                         break;
 166                 case 'C':
 167                         docompare = 1;
 168                         break;
 169                 case 'c':
 170                         /* For backwards compatibility. */
 171                         break;
 172                 case 'D':
 173                         destdir = optarg;
 174                         break;
 175                 case 'd':
 176                         dodir = 1;
 177                         break;
 178                 case 'f':
 179                         haveopt_f = 1;
 180                         fflags = optarg;
 181                         break;
 182                 case 'g':
 183                         haveopt_g = 1;
 184                         group = optarg;
 185                         break;
 186                 case 'h':
 187                         digest = optarg;
 188                         break;
 189                 case 'l':
 190                         for (p = optarg; *p != '\0'; p++)
 191                                 switch (*p) {
 192                                 case 's':
 193                                         dolink &= ~(LN_HARD|LN_MIXED);
 194                                         dolink |= LN_SYMBOLIC;
 195                                         break;
 196                                 case 'h':
 197                                         dolink &= ~(LN_SYMBOLIC|LN_MIXED);
 198                                         dolink |= LN_HARD;
 199                                         break;
 200                                 case 'm':
 201                                         dolink &= ~(LN_SYMBOLIC|LN_HARD);
 202                                         dolink |= LN_MIXED;
 203                                         break;
 204                                 case 'a':
 205                                         dolink &= ~LN_RELATIVE;
 206                                         dolink |= LN_ABSOLUTE;
 207                                         break;
 208                                 case 'r':
 209                                         dolink &= ~LN_ABSOLUTE;
 210                                         dolink |= LN_RELATIVE;
 211                                         break;
 212                                 default:
 213                                         errx(1, "%c: invalid link type", *p);
 214                                         /* NOTREACHED */
 215                                 }
 216                         break;
 217                 case 'M':
 218                         metafile = optarg;
 219                         break;
 220                 case 'm':
 221                         haveopt_m = 1;
 222                         if (!(set = setmode(optarg)))
 223                                 errx(EX_USAGE, "invalid file mode: %s",
 224                                      optarg);
 225                         mode = getmode(set, 0);
 226                         free(set);
 227                         break;
 228                 case 'N':
 229                         if (!setup_getid(optarg))
 230                                 err(EX_OSERR, "Unable to use user and group "
 231                                     "databases in `%s'", optarg);
 232                         break;
 233                 case 'o':
 234                         haveopt_o = 1;
 235                         owner = optarg;
 236                         break;
 237                 case 'p':
 238                         docompare = dopreserve = 1;
 239                         break;
 240                 case 'S':
 241                         safecopy = 1;
 242                         break;
 243                 case 's':
 244                         dostrip = 1;
 245                         break;
 246                 case 'T':
 247                         tags = optarg;
 248                         break;
 249                 case 'U':
 250                         dounpriv = 1;
 251                         break;
 252                 case 'v':
 253                         verbose = 1;
 254                         break;
 255                 case '?':
 256                 default:
 257                         usage();
 258                 }
 259         argc -= optind;
 260         argv += optind;
 261
 262         /* some options make no sense when creating directories */
 263         if (dostrip && dodir) {
 264                 warnx("-d and -s may not be specified together");
 265                 usage();
 266         }
 267
 268         if (getenv("DONTSTRIP") != NULL) {
 269                 warnx("DONTSTRIP set - will not strip installed binaries");
 270                 dostrip = 0;
 271         }
 272
 273         /* must have at least two arguments, except when creating directories */
 274         if (argc == 0 || (argc == 1 && !dodir))
 275                 usage();
 276
 277         if (digest != NULL) {
 278                 if (strcmp(digest, "none") == 0) {
 279                         digesttype = DIGEST_NONE;
 280                 } else if (strcmp(digest, "md5") == 0) {
 281                        digesttype = DIGEST_MD5;
 282                 } else if (strcmp(digest, "rmd160") == 0) {
 283                         digesttype = DIGEST_RIPEMD160;
 284                 } else if (strcmp(digest, "sha1") == 0) {
 285                         digesttype = DIGEST_SHA1;
 286                 } else if (strcmp(digest, "sha256") == 0) {
 287                         digesttype = DIGEST_SHA256;
 288                 } else if (strcmp(digest, "sha512") == 0) {
 289                         digesttype = DIGEST_SHA512;
 290                 } else {
 291                         warnx("unknown digest `%s'", digest);
 292                         usage();
 293                 }
 294         }
 295
 296         /* need to make a temp copy so we can compare stripped version */
 297         if (docompare && dostrip)
 298                 safecopy = 1;
 299
 300         /* get group and owner id's */
 301         if (group != NULL && !dounpriv) {
 302                 if (gid_from_group(group, &gid) == -1) {
 303                         id_t id;
 304                         if (!parseid(group, &id))
 305                                 errx(1, "unknown group %s", group);
 306                         gid = id;
 307                 }
 308         } else
 309                 gid = (gid_t)-1;
 310
 311         if (owner != NULL && !dounpriv) {
 312                 if (uid_from_user(owner, &uid) == -1) {
 313                         id_t id;
 314                         if (!parseid(owner, &id))
 315                                 errx(1, "unknown user %s", owner);
 316                         uid = id;
 317                 }
 318         } else
 319                 uid = (uid_t)-1;
 320
 321         if (fflags != NULL && !dounpriv) {
 322                 if (strtofflags(&fflags, &fset, NULL))
 323                         errx(EX_USAGE, "%s: invalid flag", fflags);
 324                 iflags |= SETFLAGS;
 325         }
 326
 327         if (metafile != NULL) {
 328                 if ((metafp = fopen(metafile, "a")) == NULL)
 329                         warn("open %s", metafile);
 330         } else
 331                 digesttype = DIGEST_NONE;
 332
 333         if (dodir) {
 334                 for (; *argv != NULL; ++argv)
 335                         install_dir(*argv);
 336                 exit(EX_OK);
 337                 /* NOTREACHED */
 338         }
 339
 340         to_name = argv[argc - 1];
 341         no_target = stat(to_name, &to_sb);
 342         if (!no_target && S_ISDIR(to_sb.st_mode)) {
 343                 if (dolink & LN_SYMBOLIC) {
 344                         if (lstat(to_name, &to_sb) != 0)
 345                                 err(EX_OSERR, "%s vanished", to_name);
 346                         if (S_ISLNK(to_sb.st_mode)) {
 347                                 if (argc != 2) {
 348                                         errno = ENOTDIR;
 349                                         err(EX_USAGE, "%s", to_name);
 350                                 }
 351                                 install(*argv, to_name, fset, iflags);
 352                                 exit(EX_OK);
 353                         }
 354                 }
 355                 for (; *argv != to_name; ++argv)
 356                         install(*argv, to_name, fset, iflags | DIRECTORY);
 357                 exit(EX_OK);
 358                 /* NOTREACHED */
 359         }
 360
 361         /* can't do file1 file2 directory/file */
 362         if (argc != 2) {
 363                 if (no_target)
 364                         warnx("target directory `%s' does not exist",
 365                             argv[argc - 1]);
 366                 else
 367                         warnx("target `%s' is not a directory",
 368                             argv[argc - 1]);
 369                 usage();
 370         }
 371
 372         if (!no_target && !dolink) {
 373                 if (stat(*argv, &from_sb))
 374                         err(EX_OSERR, "%s", *argv);
 375                 if (!S_ISREG(to_sb.st_mode)) {
 376                         errno = EFTYPE;
 377                         err(EX_OSERR, "%s", to_name);
 378                 }
 379                 if (to_sb.st_dev == from_sb.st_dev &&
 380                     to_sb.st_ino == from_sb.st_ino)
 381                         errx(EX_USAGE,
 382                             "%s and %s are the same file", *argv, to_name);
 383         }
 384         install(*argv, to_name, fset, iflags);
 385         exit(EX_OK);
 386         /* NOTREACHED */
 387 }
 388
 389 static char *
 390 digest_file(const char *name)
 391 {
 392
 393         switch (digesttype) {
 394         case DIGEST_MD5:
 395                 return (MD5File(name, NULL));
 396         case DIGEST_RIPEMD160:
 397                 return (RIPEMD160_File(name, NULL));
 398         case DIGEST_SHA1:
 399                 return (SHA1_File(name, NULL));
 400         case DIGEST_SHA256:
 401                 return (SHA256_File(name, NULL));
 402         case DIGEST_SHA512:
 403                 return (SHA512_File(name, NULL));
 404         default:
 405                 return (NULL);
 406         }
 407 }
 408
 409 static void
 410 digest_init(DIGEST_CTX *c)
 411 {
 412
 413         switch (digesttype) {
 414         case DIGEST_NONE:
 415                 break;
 416         case DIGEST_MD5:
 417                 MD5Init(&(c->MD5));
 418                 break;
 419         case DIGEST_RIPEMD160:
 420                 RIPEMD160_Init(&(c->RIPEMD160));
 421                 break;
 422         case DIGEST_SHA1:
 423                 SHA1_Init(&(c->SHA1));
 424                 break;
 425         case DIGEST_SHA256:
 426                 SHA256_Init(&(c->SHA256));
 427                 break;
 428         case DIGEST_SHA512:
 429                 SHA512_Init(&(c->SHA512));
 430                 break;
 431         }
 432 }
 433
 434 static void
 435 digest_update(DIGEST_CTX *c, const char *data, size_t len)
 436 {
 437
 438         switch (digesttype) {
 439         case DIGEST_NONE:
 440                 break;
 441         case DIGEST_MD5:
 442                 MD5Update(&(c->MD5), data, len);
 443                 break;
 444         case DIGEST_RIPEMD160:
 445                 RIPEMD160_Update(&(c->RIPEMD160), data, len);
 446                 break;
 447         case DIGEST_SHA1:
 448                 SHA1_Update(&(c->SHA1), data, len);
 449                 break;
 450         case DIGEST_SHA256:
 451                 SHA256_Update(&(c->SHA256), data, len);
 452                 break;
 453         case DIGEST_SHA512:
 454                 SHA512_Update(&(c->SHA512), data, len);
 455                 break;
 456         }
 457 }
 458
 459 static char *
 460 digest_end(DIGEST_CTX *c, char *buf)
 461 {
 462
 463         switch (digesttype) {
 464         case DIGEST_MD5:
 465                 return (MD5End(&(c->MD5), buf));
 466         case DIGEST_RIPEMD160:
 467                 return (RIPEMD160_End(&(c->RIPEMD160), buf));
 468         case DIGEST_SHA1:
 469                 return (SHA1_End(&(c->SHA1), buf));
 470         case DIGEST_SHA256:
 471                 return (SHA256_End(&(c->SHA256), buf));
 472         case DIGEST_SHA512:
 473                 return (SHA512_End(&(c->SHA512), buf));
 474         default:
 475                 return (NULL);
 476         }
 477 }
 478
 479 /*
 480  * parseid --
 481  *      parse uid or gid from arg into id, returning non-zero if successful
 482  */
 483 static int
 484 parseid(const char *name, id_t *id)
 485 {
 486         char    *ep;
 487         errno = 0;
 488         *id = (id_t)strtoul(name, &ep, 10);
 489         if (errno || *ep != '\0')
 490                 return (0);
 491         return (1);
 492 }
 493
 494 /*
 495  * quiet_mktemp --
 496  *      mktemp implementation used mkstemp to avoid mktemp warnings.  We
 497  *      really do need mktemp semantics here as we will be creating a link.
 498  */
 499 static char *
 500 quiet_mktemp(char *template)
 501 {
 502         int fd;
 503
 504         if ((fd = mkstemp(template)) == -1)
 505                 return (NULL);
 506         close (fd);
 507         if (unlink(template) == -1)
 508                 err(EX_OSERR, "unlink %s", template);
 509         return (template);
 510 }
 511
 512 /*
 513  * do_link --
 514  *      make a hard link, obeying dorename if set
 515  *      return -1 on failure
 516  */
 517 static int
 518 do_link(const char *from_name, const char *to_name,
 519     const struct stat *target_sb)
 520 {
 521         char tmpl[MAXPATHLEN];
 522         int ret;
 523
 524         if (safecopy && target_sb != NULL) {
 525                 (void)snprintf(tmpl, sizeof(tmpl), "%s.inst.XXXXXX", to_name);
 526                 /* This usage is safe. */
 527                 if (quiet_mktemp(tmpl) == NULL)
 528                         err(EX_OSERR, "%s: mktemp", tmpl);
 529                 ret = link(from_name, tmpl);
 530                 if (ret == 0) {
 531                         if (target_sb->st_mode & S_IFDIR && rmdir(to_name) ==
 532                             -1) {
 533                                 unlink(tmpl);
 534                                 err(EX_OSERR, "%s", to_name);
 535                         }
 536 #if HAVE_STRUCT_STAT_ST_FLAGS
 537                         if (target_sb->st_flags & NOCHANGEBITS)
 538                                 (void)chflags(to_name, target_sb->st_flags &
 539                                      ~NOCHANGEBITS);
 540 #endif
 541                         if (verbose)
 542                                 printf("install: link %s -> %s\n",
 543                                     from_name, to_name);
 544                         ret = rename(tmpl, to_name);
 545                         /*
 546                          * If rename has posix semantics, then the temporary
 547                          * file may still exist when from_name and to_name point
 548                          * to the same file, so unlink it unconditionally.
 549                          */
 550                         (void)unlink(tmpl);
 551                 }
 552                 return (ret);
 553         } else {
 554                 if (verbose)
 555                         printf("install: link %s -> %s\n",
 556                             from_name, to_name);
 557                 return (link(from_name, to_name));
 558         }
 559 }
 560
 561 /*
 562  * do_symlink --
 563  *      Make a symbolic link, obeying dorename if set. Exit on failure.
 564  */
 565 static void
 566 do_symlink(const char *from_name, const char *to_name,
 567     const struct stat *target_sb)
 568 {
 569         char tmpl[MAXPATHLEN];
 570
 571         if (safecopy && target_sb != NULL) {
 572                 (void)snprintf(tmpl, sizeof(tmpl), "%s.inst.XXXXXX", to_name);
 573                 /* This usage is safe. */
 574                 if (quiet_mktemp(tmpl) == NULL)
 575                         err(EX_OSERR, "%s: mktemp", tmpl);
 576
 577                 if (symlink(from_name, tmpl) == -1)
 578                         err(EX_OSERR, "symlink %s -> %s", from_name, tmpl);
 579
 580                 if (target_sb->st_mode & S_IFDIR && rmdir(to_name) == -1) {
 581                         (void)unlink(tmpl);
 582                         err(EX_OSERR, "%s", to_name);
 583                 }
 584 #if HAVE_STRUCT_STAT_ST_FLAGS
 585                 if (target_sb->st_flags & NOCHANGEBITS)
 586                         (void)chflags(to_name, target_sb->st_flags &
 587                              ~NOCHANGEBITS);
 588 #endif
 589                 if (verbose)
 590                         printf("install: symlink %s -> %s\n",
 591                             from_name, to_name);
 592                 if (rename(tmpl, to_name) == -1) {
 593                         /* Remove temporary link before exiting. */
 594                         (void)unlink(tmpl);
 595                         err(EX_OSERR, "%s: rename", to_name);
 596                 }
 597         } else {
 598                 if (verbose)
 599                         printf("install: symlink %s -> %s\n",
 600                             from_name, to_name);
 601                 if (symlink(from_name, to_name) == -1)
 602                         err(EX_OSERR, "symlink %s -> %s", from_name, to_name);
 603         }
 604 }
 605
 606 /*
 607  * makelink --
 608  *      make a link from source to destination
 609  */
 610 static void
 611 makelink(const char *from_name, const char *to_name,
 612     const struct stat *target_sb)
 613 {
 614         char    src[MAXPATHLEN], dst[MAXPATHLEN], lnk[MAXPATHLEN];
 615         struct stat     to_sb;
 616
 617         /* Try hard links first. */
 618         if (dolink & (LN_HARD|LN_MIXED)) {
 619                 if (do_link(from_name, to_name, target_sb) == -1) {
 620                         if ((dolink & LN_HARD) || errno != EXDEV)
 621                                 err(EX_OSERR, "link %s -> %s", from_name, to_name);
 622                 } else {
 623                         if (stat(to_name, &to_sb))
 624                                 err(EX_OSERR, "%s: stat", to_name);
 625                         if (S_ISREG(to_sb.st_mode)) {
 626                                 /*
 627                                  * XXX: hard links to anything other than
 628                                  * plain files are not metalogged
 629                                  */
 630                                 int omode;
 631                                 const char *oowner, *ogroup;
 632                                 char *offlags;
 633                                 char *dres;
 634
 635                                 /*
 636                                  * XXX: use underlying perms, unless
 637                                  * overridden on command line.
 638                                  */
 639                                 omode = mode;
 640                                 if (!haveopt_m)
 641                                         mode = (to_sb.st_mode & 0777);
 642                                 oowner = owner;
 643                                 if (!haveopt_o)
 644                                         owner = NULL;
 645                                 ogroup = group;
 646                                 if (!haveopt_g)
 647                                         group = NULL;
 648                                 offlags = fflags;
 649                                 if (!haveopt_f)
 650                                         fflags = NULL;
 651                                 dres = digest_file(from_name);
 652                                 metadata_log(to_name, "file", NULL, NULL,
 653                                     dres, to_sb.st_size);
 654                                 free(dres);
 655                                 mode = omode;
 656                                 owner = oowner;
 657                                 group = ogroup;
 658                                 fflags = offlags;
 659                         }
 660                         return;
 661                 }
 662         }
 663
 664         /* Symbolic links. */
 665         if (dolink & LN_ABSOLUTE) {
 666                 /* Convert source path to absolute. */
 667                 if (realpath(from_name, src) == NULL)
 668                         err(EX_OSERR, "%s: realpath", from_name);
 669                 do_symlink(src, to_name, target_sb);
 670                 /* XXX: src may point outside of destdir */
 671                 metadata_log(to_name, "link", NULL, src, NULL, 0);
 672                 return;
 673         }
 674
 675         if (dolink & LN_RELATIVE) {
 676                 char *to_name_copy, *cp, *d, *ld, *ls, *s;
 677
 678                 if (*from_name != '/') {
 679                         /* this is already a relative link */
 680                         do_symlink(from_name, to_name, target_sb);
 681                         /* XXX: from_name may point outside of destdir. */
 682                         metadata_log(to_name, "link", NULL, from_name, NULL, 0);
 683                         return;
 684                 }
 685
 686                 /* Resolve pathnames. */
 687                 if (realpath(from_name, src) == NULL)
 688                         err(EX_OSERR, "%s: realpath", from_name);
 689
 690                 /*
 691                  * The last component of to_name may be a symlink,
 692                  * so use realpath to resolve only the directory.
 693                  */
 694                 to_name_copy = strdup(to_name);
 695                 if (to_name_copy == NULL)
 696                         err(EX_OSERR, "%s: strdup", to_name);
 697                 cp = dirname(to_name_copy);
 698                 if (realpath(cp, dst) == NULL)
 699                         err(EX_OSERR, "%s: realpath", cp);
 700                 /* .. and add the last component. */
 701                 if (strcmp(dst, "/") != 0) {
 702                         if (strlcat(dst, "/", sizeof(dst)) > sizeof(dst))
 703                                 errx(1, "resolved pathname too long");
 704                 }
 705                 strcpy(to_name_copy, to_name);
 706                 cp = basename(to_name_copy);
 707                 if (strlcat(dst, cp, sizeof(dst)) > sizeof(dst))
 708                         errx(1, "resolved pathname too long");
 709                 free(to_name_copy);
 710
 711                 /* Trim common path components. */
 712                 ls = ld = NULL;
 713                 for (s = src, d = dst; *s == *d; ls = s, ld = d, s++, d++)
 714                         continue;
 715                 /*
 716                  * If we didn't end after a directory separator, then we've
 717                  * falsely matched the last component.  For example, if one
 718                  * invoked install -lrs /lib/foo.so /libexec/ then the source
 719                  * would terminate just after the separator while the
 720                  * destination would terminate in the middle of 'libexec',
 721                  * leading to a full directory getting falsely eaten.
 722                  */
 723                 if ((ls != NULL && *ls != '/') || (ld != NULL && *ld != '/'))
 724                         s--, d--;
 725                 while (*s != '/')
 726                         s--, d--;
 727
 728                 /* Count the number of directories we need to backtrack. */
 729                 for (++d, lnk[0] = '\0'; *d; d++)
 730                         if (*d == '/')
 731                                 (void)strlcat(lnk, "../", sizeof(lnk));
 732
 733                 (void)strlcat(lnk, ++s, sizeof(lnk));
 734
 735                 do_symlink(lnk, to_name, target_sb);
 736                 /* XXX: Link may point outside of destdir. */
 737                 metadata_log(to_name, "link", NULL, lnk, NULL, 0);
 738                 return;
 739         }
 740
 741         /*
 742          * If absolute or relative was not specified, try the names the
 743          * user provided.
 744          */
 745         do_symlink(from_name, to_name, target_sb);
 746         /* XXX: from_name may point outside of destdir. */
 747         metadata_log(to_name, "link", NULL, from_name, NULL, 0);
 748 }
 749
 750 /*
 751  * install --
 752  *      build a path name and install the file
 753  */
 754 static void
 755 install(const char *from_name, const char *to_name, u_long fset, u_int flags)
 756 {
 757         struct stat from_sb, temp_sb, to_sb;
 758         struct timespec tsb[2];
 759         int devnull, files_match, from_fd, serrno, stripped, target;
 760         int tempcopy, temp_fd, to_fd;
 761         char backup[MAXPATHLEN], *p, pathbuf[MAXPATHLEN], tempfile[MAXPATHLEN];
 762         char *digestresult;
 763
 764         digestresult = NULL;
 765         files_match = stripped = 0;
 766         from_fd = -1;
 767         to_fd = -1;
 768
 769         /* If try to install NULL file to a directory, fails. */
 770         if (flags & DIRECTORY || strcmp(from_name, _PATH_DEVNULL)) {
 771                 if (!dolink) {
 772                         if (stat(from_name, &from_sb))
 773                                 err(EX_OSERR, "%s", from_name);
 774                         if (!S_ISREG(from_sb.st_mode)) {
 775                                 errno = EFTYPE;
 776                                 err(EX_OSERR, "%s", from_name);
 777                         }
 778                 }
 779                 /* Build the target path. */
 780                 if (flags & DIRECTORY) {
 781                         (void)snprintf(pathbuf, sizeof(pathbuf), "%s%s%s",
 782                             to_name,
 783                             to_name[strlen(to_name) - 1] == '/' ? "" : "/",
 784                             (p = strrchr(from_name, '/')) ? ++p : from_name);
 785                         to_name = pathbuf;
 786                 }
 787                 devnull = 0;
 788         } else {
 789                 devnull = 1;
 790         }
 791
 792         target = (lstat(to_name, &to_sb) == 0);
 793
 794         if (dolink) {
 795                 if (target && !safecopy) {
 796                         if (to_sb.st_mode & S_IFDIR && rmdir(to_name) == -1)
 797                                 err(EX_OSERR, "%s", to_name);
 798 #if HAVE_STRUCT_STAT_ST_FLAGS
 799                         if (to_sb.st_flags & NOCHANGEBITS)
 800                                 (void)chflags(to_name,
 801                                     to_sb.st_flags & ~NOCHANGEBITS);
 802 #endif
 803                         unlink(to_name);
 804                 }
 805                 makelink(from_name, to_name, target ? &to_sb : NULL);
 806                 return;
 807         }
 808
 809         if (target && !S_ISREG(to_sb.st_mode) && !S_ISLNK(to_sb.st_mode)) {
 810                 errno = EFTYPE;
 811                 warn("%s", to_name);
 812                 return;
 813         }
 814
 815         /* Only copy safe if the target exists. */
 816         tempcopy = safecopy && target;
 817
 818         if (!devnull && (from_fd = open(from_name, O_RDONLY, 0)) < 0)
 819                 err(EX_OSERR, "%s", from_name);
 820
 821         /* If we don't strip, we can compare first. */
 822         if (docompare && !dostrip && target && S_ISREG(to_sb.st_mode)) {
 823                 if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
 824                         err(EX_OSERR, "%s", to_name);
 825                 if (devnull)
 826                         files_match = to_sb.st_size == 0;
 827                 else
 828                         files_match = !(compare(from_fd, from_name,
 829                             (size_t)from_sb.st_size, to_fd,
 830                             to_name, (size_t)to_sb.st_size, &digestresult));
 831
 832                 /* Close "to" file unless we match. */
 833                 if (!files_match)
 834                         (void)close(to_fd);
 835         }
 836
 837         if (!files_match) {
 838                 if (tempcopy) {
 839                         to_fd = create_tempfile(to_name, tempfile,
 840                             sizeof(tempfile));
 841                         if (to_fd < 0)
 842                                 err(EX_OSERR, "%s", tempfile);
 843                 } else {
 844                         if ((to_fd = create_newfile(to_name, target,
 845                             &to_sb)) < 0)
 846                                 err(EX_OSERR, "%s", to_name);
 847                         if (verbose)
 848                                 (void)printf("install: %s -> %s\n",
 849                                     from_name, to_name);
 850                 }
 851                 if (!devnull) {
 852                         if (dostrip)
 853                             stripped = strip(tempcopy ? tempfile : to_name,
 854                                 to_fd, from_name, &digestresult);
 855                         if (!stripped)
 856                             digestresult = copy(from_fd, from_name, to_fd,
 857                                 tempcopy ? tempfile : to_name, from_sb.st_size);
 858                 }
 859         }
 860
 861         if (dostrip) {
 862                 if (!stripped)
 863                         (void)strip(tempcopy ? tempfile : to_name, to_fd,
 864                             NULL, &digestresult);
 865
 866                 /*
 867                  * Re-open our fd on the target, in case
 868                  * we did not strip in-place.
 869                  */
 870                 close(to_fd);
 871                 to_fd = open(tempcopy ? tempfile : to_name, O_RDONLY, 0);
 872                 if (to_fd < 0)
 873                         err(EX_OSERR, "stripping %s", to_name);
 874         }
 875
 876         /*
 877          * Compare the stripped temp file with the target.
 878          */
 879         if (docompare && dostrip && target && S_ISREG(to_sb.st_mode)) {
 880                 temp_fd = to_fd;
 881
 882                 /* Re-open to_fd using the real target name. */
 883                 if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
 884                         err(EX_OSERR, "%s", to_name);
 885
 886                 if (fstat(temp_fd, &temp_sb)) {
 887                         serrno = errno;
 888                         (void)unlink(tempfile);
 889                         errno = serrno;
 890                         err(EX_OSERR, "%s", tempfile);
 891                 }
 892
 893                 if (compare(temp_fd, tempfile, (size_t)temp_sb.st_size, to_fd,
 894                             to_name, (size_t)to_sb.st_size, &digestresult)
 895                             == 0) {
 896                         /*
 897                          * If target has more than one link we need to
 898                          * replace it in order to snap the extra links.
 899                          * Need to preserve target file times, though.
 900                          */
 901                         if (to_sb.st_nlink != 1) {
 902                                 tsb[0] = to_sb.st_atim;
 903                                 tsb[1] = to_sb.st_mtim;
 904                                 (void)utimensat(AT_FDCWD, tempfile, tsb, 0);
 905                         } else {
 906                                 files_match = 1;
 907                                 (void)unlink(tempfile);
 908                         }
 909                         (void) close(temp_fd);
 910                 }
 911         } else if (dostrip)
 912                 digestresult = digest_file(tempfile);
 913
 914         /*
 915          * Move the new file into place if doing a safe copy
 916          * and the files are different (or just not compared).
 917          */
 918         if (tempcopy && !files_match) {
 919 #if HAVE_STRUCT_STAT_ST_FLAGS
 920                 /* Try to turn off the immutable bits. */
 921                 if (to_sb.st_flags & NOCHANGEBITS)
 922                         (void)chflags(to_name, to_sb.st_flags & ~NOCHANGEBITS);
 923 #endif
 924                 if (dobackup) {
 925                         if ((size_t)snprintf(backup, MAXPATHLEN, "%s%s", to_name,
 926                             suffix) != strlen(to_name) + strlen(suffix)) {
 927                                 unlink(tempfile);
 928                                 errx(EX_OSERR, "%s: backup filename too long",
 929                                     to_name);
 930                         }
 931                         if (verbose)
 932                                 (void)printf("install: %s -> %s\n", to_name, backup);
 933                         if (unlink(backup) < 0 && errno != ENOENT) {
 934                                 serrno = errno;
 935 #if HAVE_STRUCT_STAT_ST_FLAGS
 936                                 if (to_sb.st_flags & NOCHANGEBITS)
 937                                         (void)chflags(to_name, to_sb.st_flags);
 938 #endif
 939                                 unlink(tempfile);
 940                                 errno = serrno;
 941                                 err(EX_OSERR, "unlink: %s", backup);
 942                         }
 943                         if (link(to_name, backup) < 0) {
 944                                 serrno = errno;
 945                                 unlink(tempfile);
 946 #if HAVE_STRUCT_STAT_ST_FLAGS
 947                                 if (to_sb.st_flags & NOCHANGEBITS)
 948                                         (void)chflags(to_name, to_sb.st_flags);
 949 #endif
 950                                 errno = serrno;
 951                                 err(EX_OSERR, "link: %s to %s", to_name,
 952                                      backup);
 953                         }
 954                 }
 955                 if (verbose)
 956                         (void)printf("install: %s -> %s\n", from_name, to_name);
 957                 if (rename(tempfile, to_name) < 0) {
 958                         serrno = errno;
 959                         unlink(tempfile);
 960                         errno = serrno;
 961                         err(EX_OSERR, "rename: %s to %s",
 962                             tempfile, to_name);
 963                 }
 964
 965                 /* Re-open to_fd so we aren't hosed by the rename(2). */
 966                 (void) close(to_fd);
 967                 if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
 968                         err(EX_OSERR, "%s", to_name);
 969         }
 970
 971         /*
 972          * Preserve the timestamp of the source file if necessary.
 973          */
 974         if (dopreserve && !files_match && !devnull) {
 975                 tsb[0] = from_sb.st_atim;
 976                 tsb[1] = from_sb.st_mtim;
 977                 (void)utimensat(AT_FDCWD, to_name, tsb, 0);
 978         }
 979
 980         if (fstat(to_fd, &to_sb) == -1) {
 981                 serrno = errno;
 982                 (void)unlink(to_name);
 983                 errno = serrno;
 984                 err(EX_OSERR, "%s", to_name);
 985         }
 986
 987         /*
 988          * Set owner, group, mode for target; do the chown first,
 989          * chown may lose the setuid bits.
 990          */
 991         if (!dounpriv && ((gid != (gid_t)-1 && gid != to_sb.st_gid) ||
 992             (uid != (uid_t)-1 && uid != to_sb.st_uid) ||
 993             (mode != (to_sb.st_mode & ALLPERMS)))) {
 994 #if HAVE_STRUCT_STAT_ST_FLAGS
 995                 /* Try to turn off the immutable bits. */
 996                 if (to_sb.st_flags & NOCHANGEBITS)
 997                         (void)fchflags(to_fd, to_sb.st_flags & ~NOCHANGEBITS);
 998 #endif
 999         }
1000
1001         if (!dounpriv &
1002             (gid != (gid_t)-1 && gid != to_sb.st_gid) ||
1003             (uid != (uid_t)-1 && uid != to_sb.st_uid))
1004                 if (fchown(to_fd, uid, gid) == -1) {
1005                         serrno = errno;
1006                         (void)unlink(to_name);
1007                         errno = serrno;
1008                         err(EX_OSERR,"%s: chown/chgrp", to_name);
1009                 }
1010
1011         if (mode != (to_sb.st_mode & ALLPERMS)) {
1012                 if (fchmod(to_fd,
1013                      dounpriv ? mode & (S_IRWXU|S_IRWXG|S_IRWXO) : mode)) {
1014                         serrno = errno;
1015                         (void)unlink(to_name);
1016                         errno = serrno;
1017                         err(EX_OSERR, "%s: chmod", to_name);
1018                 }
1019         }
1020 #if HAVE_STRUCT_STAT_ST_FLAGS
1021         /*
1022          * If provided a set of flags, set them, otherwise, preserve the
1023          * flags, except for the dump flag.
1024          * NFS does not support flags.  Ignore EOPNOTSUPP flags if we're just
1025          * trying to turn off UF_NODUMP.  If we're trying to set real flags,
1026          * then warn if the fs doesn't support it, otherwise fail.
1027          */
1028         if (!dounpriv & !devnull && (flags & SETFLAGS ||
1029             (from_sb.st_flags & ~UF_NODUMP) != to_sb.st_flags) &&
1030             fchflags(to_fd,
1031             flags & SETFLAGS ? fset : from_sb.st_flags & ~UF_NODUMP)) {
1032                 if (flags & SETFLAGS) {
1033                         if (errno == EOPNOTSUPP)
1034                                 warn("%s: chflags", to_name);
1035                         else {
1036                                 serrno = errno;
1037                                 (void)unlink(to_name);
1038                                 errno = serrno;
1039                                 err(EX_OSERR, "%s: chflags", to_name);
1040                         }
1041                 }
1042         }
1043 #endif
1044
1045         (void)close(to_fd);
1046         if (!devnull)
1047                 (void)close(from_fd);
1048
1049         metadata_log(to_name, "file", tsb, NULL, digestresult, to_sb.st_size);
1050         free(digestresult);
1051 }
1052
1053 /*
1054  * compare --
1055  *      Compare two files; non-zero means files differ.
1056  *      Compute digest and return its address in *dresp
1057  *      unless it points to pre-computed digest.
1058  */
1059 static int
1060 compare(int from_fd, const char *from_name __unused, size_t from_len,
1061         int to_fd, const char *to_name __unused, size_t to_len,
1062         char **dresp)
1063 {
1064         char *p, *q;
1065         int rv;
1066         int do_digest, done_compare;
1067         DIGEST_CTX ctx;
1068
1069         rv = 0;
1070         if (from_len != to_len)
1071                 return 1;
1072
1073         do_digest = (digesttype != DIGEST_NONE && dresp != NULL &&
1074                         *dresp == NULL);
1075         if (from_len <= MAX_CMP_SIZE) {
1076                 if (do_digest)
1077                         digest_init(&ctx);
1078                 done_compare = 0;
1079                 if (trymmap(from_fd) && trymmap(to_fd)) {
1080                         p = mmap(NULL, from_len, PROT_READ, MAP_SHARED,
1081                             from_fd, (off_t)0);
1082                         if (p == MAP_FAILED)
1083                                 goto out;
1084                         q = mmap(NULL, from_len, PROT_READ, MAP_SHARED,
1085                             to_fd, (off_t)0);
1086                         if (q == MAP_FAILED) {
1087                                 munmap(p, from_len);
1088                                 goto out;
1089                         }
1090
1091                         rv = memcmp(p, q, from_len);
1092                         if (do_digest)
1093                                 digest_update(&ctx, p, from_len);
1094                         munmap(p, from_len);
1095                         munmap(q, from_len);
1096                         done_compare = 1;
1097                 }
1098         out:
1099                 if (!done_compare) {
1100                         char buf1[MAXBSIZE];
1101                         char buf2[MAXBSIZE];
1102                         int n1, n2;
1103
1104                         rv = 0;
1105                         lseek(from_fd, 0, SEEK_SET);
1106                         lseek(to_fd, 0, SEEK_SET);
1107                         while (rv == 0) {
1108                                 n1 = read(from_fd, buf1, sizeof(buf1));
1109                                 if (n1 == 0)
1110                                         break;          /* EOF */
1111                                 else if (n1 > 0) {
1112                                         n2 = read(to_fd, buf2, n1);
1113                                         if (n2 == n1)
1114                                                 rv = memcmp(buf1, buf2, n1);
1115                                         else
1116                                                 rv = 1; /* out of sync */
1117                                 } else
1118                                         rv = 1;         /* read failure */
1119                                 if (do_digest)
1120                                         digest_update(&ctx, buf1, n1);
1121                         }
1122                         lseek(from_fd, 0, SEEK_SET);
1123                         lseek(to_fd, 0, SEEK_SET);
1124                 }
1125         } else
1126                 rv = 1; /* don't bother in this case */
1127
1128         if (do_digest) {
1129                 if (rv == 0)
1130                         *dresp = digest_end(&ctx, NULL);
1131                 else
1132                         (void)digest_end(&ctx, NULL);
1133         }
1134
1135         return rv;
1136 }
1137
1138 /*
1139  * create_tempfile --
1140  *      create a temporary file based on path and open it
1141  */
1142 static int
1143 create_tempfile(const char *path, char *temp, size_t tsize)
1144 {
1145         char *p;
1146
1147         (void)strncpy(temp, path, tsize);
1148         temp[tsize - 1] = '\0';
1149         if ((p = strrchr(temp, '/')) != NULL)
1150                 p++;
1151         else
1152                 p = temp;
1153         (void)strncpy(p, "INS@XXXX", &temp[tsize - 1] - p);
1154         temp[tsize - 1] = '\0';
1155         return (mkstemp(temp));
1156 }
1157
1158 /*
1159  * create_newfile --
1160  *      create a new file, overwriting an existing one if necessary
1161  */
1162 static int
1163 create_newfile(const char *path, int target, struct stat *sbp)
1164 {
1165         char backup[MAXPATHLEN];
1166         int saved_errno = 0;
1167         int newfd;
1168
1169         if (target) {
1170                 /*
1171                  * Unlink now... avoid ETXTBSY errors later.  Try to turn
1172                  * off the append/immutable bits -- if we fail, go ahead,
1173                  * it might work.
1174                  */
1175 #if HAVE_STRUCT_STAT_ST_FLAGS
1176                 if (sbp->st_flags & NOCHANGEBITS)
1177                         (void)chflags(path, sbp->st_flags & ~NOCHANGEBITS);
1178 #endif
1179
1180                 if (dobackup) {
1181                         if ((size_t)snprintf(backup, MAXPATHLEN, "%s%s",
1182                             path, suffix) != strlen(path) + strlen(suffix)) {
1183                                 saved_errno = errno;
1184 #if HAVE_STRUCT_STAT_ST_FLAGS
1185                                 if (sbp->st_flags & NOCHANGEBITS)
1186                                         (void)chflags(path, sbp->st_flags);
1187 #endif
1188                                 errno = saved_errno;
1189                                 errx(EX_OSERR, "%s: backup filename too long",
1190                                     path);
1191                         }
1192                         (void)snprintf(backup, MAXPATHLEN, "%s%s",
1193                             path, suffix);
1194                         if (verbose)
1195                                 (void)printf("install: %s -> %s\n",
1196                                     path, backup);
1197                         if (rename(path, backup) < 0) {
1198                                 saved_errno = errno;
1199 #if HAVE_STRUCT_STAT_ST_FLAGS
1200                                 if (sbp->st_flags & NOCHANGEBITS)
1201                                         (void)chflags(path, sbp->st_flags);
1202 #endif
1203                                 errno = saved_errno;
1204                                 err(EX_OSERR, "rename: %s to %s", path, backup);
1205                         }
1206                 } else
1207                         if (unlink(path) < 0)
1208                                 saved_errno = errno;
1209         }
1210
1211         newfd = open(path, O_CREAT | O_RDWR | O_TRUNC, S_IRUSR | S_IWUSR);
1212         if (newfd < 0 && saved_errno != 0)
1213                 errno = saved_errno;
1214         return newfd;
1215 }
1216
1217 /*
1218  * copy --
1219  *      copy from one file to another
1220  */
1221 static char *
1222 copy(int from_fd, const char *from_name, int to_fd, const char *to_name,
1223     off_t size)
1224 {
1225         int nr, nw;
1226         int serrno;
1227         char *p;
1228         char buf[MAXBSIZE];
1229         int done_copy;
1230         DIGEST_CTX ctx;
1231
1232         /* Rewind file descriptors. */
1233         if (lseek(from_fd, (off_t)0, SEEK_SET) == (off_t)-1)
1234                 err(EX_OSERR, "lseek: %s", from_name);
1235         if (lseek(to_fd, (off_t)0, SEEK_SET) == (off_t)-1)
1236                 err(EX_OSERR, "lseek: %s", to_name);
1237
1238         digest_init(&ctx);
1239
1240         /*
1241          * Mmap and write if less than 8M (the limit is so we don't totally
1242          * trash memory on big files.  This is really a minor hack, but it
1243          * wins some CPU back.
1244          */
1245         done_copy = 0;
1246         if (size <= 8 * 1048576 && trymmap(from_fd) &&
1247             (p = mmap(NULL, (size_t)size, PROT_READ, MAP_SHARED,
1248                     from_fd, (off_t)0)) != MAP_FAILED) {
1249                 nw = write(to_fd, p, size);
1250                 if (nw != size) {
1251                         serrno = errno;
1252                         (void)unlink(to_name);
1253                         if (nw >= 0) {
1254                                 errx(EX_OSERR,
1255      "short write to %s: %jd bytes written, %jd bytes asked to write",
1256                                     to_name, (uintmax_t)nw, (uintmax_t)size);
1257                         } else {
1258                                 errno = serrno;
1259                                 err(EX_OSERR, "%s", to_name);
1260                         }
1261                 }
1262                 digest_update(&ctx, p, size);
1263                 (void)munmap(p, size);
1264                 done_copy = 1;
1265         }
1266         if (!done_copy) {
1267                 while ((nr = read(from_fd, buf, sizeof(buf))) > 0) {
1268                         if ((nw = write(to_fd, buf, nr)) != nr) {
1269                                 serrno = errno;
1270                                 (void)unlink(to_name);
1271                                 if (nw >= 0) {
1272                                         errx(EX_OSERR,
1273      "short write to %s: %jd bytes written, %jd bytes asked to write",
1274                                             to_name, (uintmax_t)nw,
1275                                             (uintmax_t)size);
1276                                 } else {
1277                                         errno = serrno;
1278                                         err(EX_OSERR, "%s", to_name);
1279                                 }
1280                         }
1281                         digest_update(&ctx, buf, nr);
1282                 }
1283                 if (nr != 0) {
1284                         serrno = errno;
1285                         (void)unlink(to_name);
1286                         errno = serrno;
1287                         err(EX_OSERR, "%s", from_name);
1288                 }
1289         }
1290         if (safecopy && fsync(to_fd) == -1) {
1291                 serrno = errno;
1292                 (void)unlink(to_name);
1293                 errno = serrno;
1294                 err(EX_OSERR, "fsync failed for %s", to_name);
1295         }
1296         return (digest_end(&ctx, NULL));
1297 }
1298
1299 /*
1300  * strip --
1301  *      Use strip(1) to strip the target file.
1302  *      Just invoke strip(1) on to_name if from_name is NULL, else try
1303  *      to run "strip -o to_name -- from_name" and return 0 on failure.
1304  *      Return 1 on success and assign result of digest_file(to_name)
1305  *      to *dresp.
1306  */
1307 static int
1308 strip(const char *to_name, int to_fd, const char *from_name, char **dresp)
1309 {
1310         const char *stripbin;
1311         const char *args[6];
1312         pid_t pid;
1313         int error, serrno, status;
1314
1315         stripbin = getenv("STRIPBIN");
1316         if (stripbin == NULL)
1317                 stripbin = "strip";
1318         args[0] = stripbin;
1319         if (from_name == NULL) {
1320                 args[1] = to_name;
1321                 args[2] = NULL;
1322         } else {
1323                 args[1] = "-o";
1324                 args[2] = to_name;
1325                 args[3] = "--";
1326                 args[4] = from_name;
1327                 args[5] = NULL;
1328         }
1329         error = posix_spawnp(&pid, stripbin, NULL, NULL,
1330             __DECONST(char **, args), environ);
1331         if (error != 0) {
1332                 (void)unlink(to_name);
1333                 errc(error == EAGAIN || error == EPROCLIM || error == ENOMEM ?
1334                     EX_TEMPFAIL : EX_OSERR, error, "spawn %s", stripbin);
1335         }
1336         if (waitpid(pid, &status, 0) == -1) {
1337                 error = errno;
1338                 (void)unlink(to_name);
1339                 errc(EX_SOFTWARE, error, "wait");
1340                 /* NOTREACHED */
1341         }
1342         if (status != 0) {
1343                 if (from_name != NULL)
1344                         return (0);
1345                 (void)unlink(to_name);
1346                 errx(EX_SOFTWARE, "strip command %s failed on %s",
1347                     stripbin, to_name);
1348         }
1349         if (from_name != NULL && safecopy && fsync(to_fd) == -1) {
1350                 serrno = errno;
1351                 (void)unlink(to_name);
1352                 errno = serrno;
1353                 err(EX_OSERR, "fsync failed for %s", to_name);
1354         }
1355         if (dresp != NULL)
1356                 *dresp = digest_file(to_name);
1357         return (1);
1358 }
1359
1360 /*
1361  * install_dir --
1362  *      build directory hierarchy
1363  */
1364 static void
1365 install_dir(char *path)
1366 {
1367         char *p;
1368         struct stat sb;
1369         int ch, tried_mkdir;
1370
1371         for (p = path;; ++p)
1372                 if (!*p || (p != path && *p  == '/')) {
1373                         tried_mkdir = 0;
1374                         ch = *p;
1375                         *p = '\0';
1376 again:
1377                         if (stat(path, &sb) < 0) {
1378                                 if (errno != ENOENT || tried_mkdir)
1379                                         err(EX_OSERR, "stat %s", path);
1380                                 if (mkdir(path, 0755) < 0) {
1381                                         tried_mkdir = 1;
1382                                         if (errno == EEXIST)
1383                                                 goto again;
1384                                         err(EX_OSERR, "mkdir %s", path);
1385                                 }
1386                                 if (verbose)
1387                                         (void)printf("install: mkdir %s\n",
1388                                             path);
1389                         } else if (!S_ISDIR(sb.st_mode))
1390                                 errx(EX_OSERR, "%s exists but is not a directory", path);
1391                         if (!(*p = ch))
1392                                 break;
1393                 }
1394
1395         if (!dounpriv) {
1396                 if ((gid != (gid_t)-1 || uid != (uid_t)-1) &&
1397                     chown(path, uid, gid))
1398                         warn("chown %u:%u %s", uid, gid, path);
1399                 /* XXXBED: should we do the chmod in the dounpriv case? */
1400                 if (chmod(path, mode))
1401                         warn("chmod %o %s", mode, path);
1402         }
1403         metadata_log(path, "dir", NULL, NULL, NULL, 0);
1404 }
1405
1406 /*
1407  * metadata_log --
1408  *      if metafp is not NULL, output mtree(8) full path name and settings to
1409  *      metafp, to allow permissions to be set correctly by other tools,
1410  *      or to allow integrity checks to be performed.
1411  */
1412 static void
1413 metadata_log(const char *path, const char *type, struct timespec *ts,
1414         const char *slink, const char *digestresult, off_t size)
1415 {
1416         static const char extra[] = { ' ', '\t', '\n', '\\', '#', '\0' };
1417         const char *p;
1418         char *buf;
1419         size_t destlen;
1420         struct flock metalog_lock;
1421
1422         if (!metafp)
1423                 return;
1424         /* Buffer for strsvis(3). */
1425         buf = (char *)malloc(4 * strlen(path) + 1);
1426         if (buf == NULL) {
1427                 warnx("%s", strerror(ENOMEM));
1428                 return;
1429         }
1430
1431         /* Lock log file. */
1432         metalog_lock.l_start = 0;
1433         metalog_lock.l_len = 0;
1434         metalog_lock.l_whence = SEEK_SET;
1435         metalog_lock.l_type = F_WRLCK;
1436         if (fcntl(fileno(metafp), F_SETLKW, &metalog_lock) == -1) {
1437                 warn("can't lock %s", metafile);
1438                 free(buf);
1439                 return;
1440         }
1441
1442         /* Remove destdir. */
1443         p = path;
1444         if (destdir) {
1445                 destlen = strlen(destdir);
1446                 if (strncmp(p, destdir, destlen) == 0 &&
1447                     (p[destlen] == '/' || p[destlen] == '\0'))
1448                         p += destlen;
1449         }
1450         while (*p && *p == '/')
1451                 p++;
1452         strsvis(buf, p, VIS_OCTAL, extra);
1453         p = buf;
1454         /* Print details. */
1455         fprintf(metafp, ".%s%s type=%s", *p ? "/" : "", p, type);
1456         if (owner)
1457                 fprintf(metafp, " uname=%s", owner);
1458         if (group)
1459                 fprintf(metafp, " gname=%s", group);
1460         fprintf(metafp, " mode=%#o", mode);
1461         if (slink) {
1462                 strsvis(buf, slink, VIS_CSTYLE, extra); /* encode link */
1463                 fprintf(metafp, " link=%s", buf);
1464         }
1465         if (*type == 'f') /* type=file */
1466                 fprintf(metafp, " size=%lld", (long long)size);
1467         if (ts != NULL && dopreserve)
1468                 fprintf(metafp, " time=%lld.%09ld",
1469                         (long long)ts[1].tv_sec, ts[1].tv_nsec);
1470         if (digestresult && digest)
1471                 fprintf(metafp, " %s=%s", digest, digestresult);
1472         if (fflags)
1473                 fprintf(metafp, " flags=%s", fflags);
1474         if (tags)
1475                 fprintf(metafp, " tags=%s", tags);
1476         fputc('\n', metafp);
1477         /* Flush line. */
1478         fflush(metafp);
1479
1480         /* Unlock log file. */
1481         metalog_lock.l_type = F_UNLCK;
1482         if (fcntl(fileno(metafp), F_SETLKW, &metalog_lock) == -1)
1483                 warn("can't unlock %s", metafile);
1484         free(buf);
1485 }
1486
1487 /*
1488  * usage --
1489  *      print a usage message and die
1490  */
1491 static void
1492 usage(void)
1493 {
1494         (void)fprintf(stderr,
1495 "usage: install [-bCcpSsUv] [-f flags] [-g group] [-m mode] [-o owner]\n"
1496 "               [-M log] [-D dest] [-h hash] [-T tags]\n"
1497 "               [-B suffix] [-l linkflags] [-N dbdir]\n"
1498 "               file1 file2\n"
1499 "       install [-bCcpSsUv] [-f flags] [-g group] [-m mode] [-o owner]\n"
1500 "               [-M log] [-D dest] [-h hash] [-T tags]\n"
1501 "               [-B suffix] [-l linkflags] [-N dbdir]\n"
1502 "               file1 ... fileN directory\n"
1503 "       install -dU [-vU] [-g group] [-m mode] [-N dbdir] [-o owner]\n"
1504 "               [-M log] [-D dest] [-h hash] [-T tags]\n"
1505 "               directory ...\n");
1506         exit(EX_USAGE);
1507         /* NOTREACHED */
1508 }
1509
1510 /*
1511  * trymmap --
1512  *      return true (1) if mmap should be tried, false (0) if not.
1513  */
1514 static int
1515 trymmap(int fd)
1516 {
1517 /*
1518  * The ifdef is for bootstrapping - f_fstypename doesn't exist in
1519  * pre-Lite2-merge systems.
1520  */
1521 #ifdef MFSNAMELEN
1522         struct statfs stfs;
1523
1524         if (fstatfs(fd, &stfs) != 0)
1525                 return (0);
1526         if (strcmp(stfs.f_fstypename, "ufs") == 0 ||
1527             strcmp(stfs.f_fstypename, "cd9660") == 0)
1528                 return (1);
1529 #endif
1530         return (0);
1531 }