usr.bin/xinstall/xinstall.c

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