install/xinstall.c

   1 /*
   2  * Copyright (c) 1987, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifndef lint
  35 static const char copyright[] =
  36 "@(#) Copyright (c) 1987, 1993\n\
  37         The Regents of the University of California.  All rights reserved.\n";
  38 #endif /* not lint */
  39
  40 #ifndef lint
  41 #if 0
  42 static char sccsid[] = "From: @(#)xinstall.c    8.1 (Berkeley) 7/21/93";
  43 #endif
  44 static const char rcsid[] =
  45   "$FreeBSD: src/usr.bin/xinstall/xinstall.c,v 1.43 2001/05/30 07:08:49 ru Exp $";
  46 #endif /* not lint */
  47
  48 #include <sys/param.h>
  49 #include <sys/wait.h>
  50 #include <sys/mman.h>
  51 #include <sys/stat.h>
  52 #include <sys/mount.h>
  53
  54 #include <ctype.h>
  55 #include <err.h>
  56 #include <errno.h>
  57 #include <fcntl.h>
  58 #include <grp.h>
  59 #include <paths.h>
  60 #include <pwd.h>
  61 #include <stdio.h>
  62 #include <stdlib.h>
  63 #include <string.h>
  64 #include <unistd.h>
  65 #include <sysexits.h>
  66 #include <utime.h>
  67 #include <spawn.h>
  68
  69 #ifdef __APPLE__
  70 #include <TargetConditionals.h>
  71 #include <copyfile.h>
  72 #endif  /* __APPLE__ */
  73
  74 #include "pathnames.h"
  75
  76 /* Bootstrap aid - this doesn't exist in most older releases */
  77 #ifndef MAP_FAILED
  78 #define MAP_FAILED ((void *)-1) /* from <sys/mman.h> */
  79 #endif
  80
  81 #define DIRECTORY       0x01            /* Tell install it's a directory. */
  82 #define SETFLAGS        0x02            /* Tell install to set flags. */
  83 #define NOCHANGEBITS    (UF_IMMUTABLE | UF_APPEND | SF_IMMUTABLE | SF_APPEND)
  84 #define BACKUP_SUFFIX   ".old"
  85
  86 struct passwd *pp;
  87 struct group *gp;
  88 gid_t gid;
  89 uid_t uid;
  90 int dobackup, docompare, dodir, dopreserve, dostrip, nommap, safecopy, verbose;
  91 mode_t mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
  92 char *suffix = BACKUP_SUFFIX;
  93
  94 void    copy __P((int, char *, int, char *, off_t));
  95 int     compare __P((int, const char *, size_t, int, const char *, size_t));
  96 int     create_newfile __P((char *, int, struct stat *));
  97 int     create_tempfile __P((char *, char *, size_t));
  98 void    install __P((char *, char *, u_long, u_int));
  99 void    install_dir __P((char *));
 100 u_long  numeric_id __P((char *, char *));
 101 void    strip __P((char *));
 102 int     trymmap __P((int));
 103 void    usage __P((void));
 104
 105 int
 106 main(argc, argv)
 107         int argc;
 108         char *argv[];
 109 {
 110         struct stat from_sb, to_sb;
 111         mode_t *set;
 112         u_long fset = 0;
 113         int ch, no_target;
 114         u_int iflags;
 115         char *flags, *group, *owner, *to_name;
 116
 117         iflags = 0;
 118         group = owner = NULL;
 119         while ((ch = getopt(argc, argv, "B:bCcdf:g:Mm:o:pSsv")) != -1)
 120                 switch((char)ch) {
 121                 case 'B':
 122                         suffix = optarg;
 123                         /* FALLTHROUGH */
 124                 case 'b':
 125                         dobackup = 1;
 126                         break;
 127                 case 'C':
 128                         docompare = 1;
 129                         break;
 130                 case 'c':
 131                         /* For backwards compatibility. */
 132                         break;
 133                 case 'd':
 134                         dodir = 1;
 135                         break;
 136                 case 'f':
 137                         flags = optarg;
 138                         if (strtofflags(&flags, &fset, NULL))
 139                                 errx(EX_USAGE, "%s: invalid flag", flags);
 140                         iflags |= SETFLAGS;
 141                         break;
 142                 case 'g':
 143                         group = optarg;
 144                         break;
 145                 case 'M':
 146                         nommap = 1;
 147                         break;
 148                 case 'm':
 149                         if (!(set = setmode(optarg)))
 150                                 errx(EX_USAGE, "invalid file mode: %s",
 151                                      optarg);
 152                         mode = getmode(set, 0);
 153                         free(set);
 154                         break;
 155                 case 'o':
 156                         owner = optarg;
 157                         break;
 158                 case 'p':
 159                         docompare = dopreserve = 1;
 160                         break;
 161                 case 'S':
 162                         safecopy = 1;
 163                         break;
 164                 case 's':
 165                         dostrip = 1;
 166                         break;
 167                 case 'v':
 168                         verbose = 1;
 169                         break;
 170                 case '?':
 171                 default:
 172                         usage();
 173                 }
 174         argc -= optind;
 175         argv += optind;
 176
 177         /* some options make no sense when creating directories */
 178         if ((safecopy || dostrip) && dodir)
 179                 usage();
 180
 181         /*
 182          * Older versions allowed -d -C combo.  Issue a warning
 183          * for now, but turn this into an error before 4.5-RELEASE.
 184          */
 185         if (docompare && dodir)
 186                 warnx("the -d and -C options may not be specified together");
 187
 188         /* must have at least two arguments, except when creating directories */
 189         if (argc < 2 && !dodir)
 190                 usage();
 191
 192         /* need to make a temp copy so we can compare stripped version */
 193         if (docompare && dostrip)
 194                 safecopy = 1;
 195
 196         /* get group and owner id's */
 197         if (group != NULL) {
 198                 if ((gp = getgrnam(group)) != NULL)
 199                         gid = gp->gr_gid;
 200                 else
 201                         gid = (uid_t)numeric_id(group, "group");
 202         } else
 203                 gid = (gid_t)-1;
 204
 205         if (owner != NULL) {
 206                 if ((pp = getpwnam(owner)) != NULL)
 207                         uid = pp->pw_uid;
 208                 else
 209                         uid = (uid_t)numeric_id(owner, "user");
 210         } else
 211                 uid = (uid_t)-1;
 212
 213         if (dodir) {
 214                 for (; *argv != NULL; ++argv)
 215                         install_dir(*argv);
 216                 exit(EX_OK);
 217                 /* NOTREACHED */
 218         }
 219
 220         no_target = stat(to_name = argv[argc - 1], &to_sb);
 221         if (!no_target && S_ISDIR(to_sb.st_mode)) {
 222                 for (; *argv != to_name; ++argv)
 223                         install(*argv, to_name, fset, iflags | DIRECTORY);
 224                 exit(EX_OK);
 225                 /* NOTREACHED */
 226         }
 227
 228         /* can't do file1 file2 directory/file */
 229         if (argc != 2)
 230                 usage();
 231
 232         if (!no_target) {
 233                 if (stat(*argv, &from_sb))
 234                         err(EX_OSERR, "%s", *argv);
 235                 if (!S_ISREG(to_sb.st_mode)) {
 236                         errno = EFTYPE;
 237                         err(EX_OSERR, "%s", to_name);
 238                 }
 239                 if (to_sb.st_dev == from_sb.st_dev &&
 240                     to_sb.st_ino == from_sb.st_ino)
 241                         errx(EX_USAGE,
 242                             "%s and %s are the same file", *argv, to_name);
 243         }
 244         install(*argv, to_name, fset, iflags);
 245         exit(EX_OK);
 246         /* NOTREACHED */
 247 }
 248
 249 u_long
 250 numeric_id(name, type)
 251         char *name, *type;
 252 {
 253         u_long val;
 254         char *ep;
 255
 256         /*
 257          * XXX
 258          * We know that uid_t's and gid_t's are unsigned longs.
 259          */
 260         errno = 0;
 261         val = strtoul(name, &ep, 10);
 262         if (errno)
 263                 err(EX_NOUSER, "%s", name);
 264         if (*ep != '\0')
 265                 errx(EX_NOUSER, "unknown %s %s", type, name);
 266         return (val);
 267 }
 268
 269 /*
 270  * install --
 271  *      build a path name and install the file
 272  */
 273 void
 274 install(from_name, to_name, fset, flags)
 275         char *from_name, *to_name;
 276         u_long fset;
 277         u_int flags;
 278 {
 279         struct stat from_sb, temp_sb, to_sb;
 280         struct utimbuf utb;
 281         int devnull, files_match, from_fd=0, serrno, target;
 282         int tempcopy, temp_fd, to_fd=0;
 283         char backup[MAXPATHLEN], *p, pathbuf[MAXPATHLEN], tempfile[MAXPATHLEN];
 284
 285         files_match = 0;
 286
 287         /* If try to install NULL file to a directory, fails. */
 288         if (flags & DIRECTORY || strcmp(from_name, _PATH_DEVNULL)) {
 289                 if (stat(from_name, &from_sb))
 290                         err(EX_OSERR, "%s", from_name);
 291                 if (!S_ISREG(from_sb.st_mode)) {
 292                         errno = EFTYPE;
 293                         err(EX_OSERR, "%s", from_name);
 294                 }
 295                 /* Build the target path. */
 296                 if (flags & DIRECTORY) {
 297                         (void)snprintf(pathbuf, sizeof(pathbuf), "%s/%s",
 298                             to_name,
 299                             (p = strrchr(from_name, '/')) ? ++p : from_name);
 300                         to_name = pathbuf;
 301                 }
 302                 devnull = 0;
 303         } else {
 304                 devnull = 1;
 305         }
 306
 307         target = stat(to_name, &to_sb) == 0;
 308
 309         /* Only install to regular files. */
 310         if (target && !S_ISREG(to_sb.st_mode)) {
 311                 errno = EFTYPE;
 312                 warn("%s", to_name);
 313                 return;
 314         }
 315
 316         /* Only copy safe if the target exists. */
 317         tempcopy = safecopy && target;
 318
 319         if (!devnull && (from_fd = open(from_name, O_RDONLY, 0)) < 0)
 320                 err(EX_OSERR, "%s", from_name);
 321
 322         /* If we don't strip, we can compare first. */
 323         if (docompare && !dostrip && target) {
 324                 if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
 325                         err(EX_OSERR, "%s", to_name);
 326                 if (devnull)
 327                         files_match = to_sb.st_size == 0;
 328                 else
 329                         files_match = !(compare(from_fd, from_name,
 330                             (size_t)from_sb.st_size, to_fd,
 331                             to_name, (size_t)to_sb.st_size));
 332
 333                 /* Close "to" file unless we match. */
 334                 if (!files_match)
 335                         (void)close(to_fd);
 336         }
 337
 338         if (!files_match) {
 339                 if (tempcopy) {
 340                         to_fd = create_tempfile(to_name, tempfile,
 341                             sizeof(tempfile));
 342                         if (to_fd < 0)
 343                                 err(EX_OSERR, "%s", tempfile);
 344                 } else {
 345                         if ((to_fd = create_newfile(to_name, target,
 346                             &to_sb)) < 0)
 347                                 err(EX_OSERR, "%s", to_name);
 348                         if (verbose)
 349                                 (void)printf("install: %s -> %s\n",
 350                                     from_name, to_name);
 351                 }
 352                 if (!devnull)
 353                         copy(from_fd, from_name, to_fd,
 354                              tempcopy ? tempfile : to_name, from_sb.st_size);
 355         }
 356
 357         if (dostrip) {
 358                 strip(tempcopy ? tempfile : to_name);
 359
 360                 /*
 361                  * Re-open our fd on the target, in case we used a strip
 362                  * that does not work in-place -- like GNU binutils strip.
 363                  */
 364                 close(to_fd);
 365                 to_fd = open(tempcopy ? tempfile : to_name, O_RDONLY, 0);
 366                 if (to_fd < 0)
 367                         err(EX_OSERR, "stripping %s", to_name);
 368         }
 369
 370         /*
 371          * Compare the stripped temp file with the target.
 372          */
 373         if (docompare && dostrip && target) {
 374                 temp_fd = to_fd;
 375
 376                 /* Re-open to_fd using the real target name. */
 377                 if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
 378                         err(EX_OSERR, "%s", to_name);
 379
 380                 if (fstat(temp_fd, &temp_sb)) {
 381                         serrno = errno;
 382                         (void)unlink(tempfile);
 383                         errno = serrno;
 384                         err(EX_OSERR, "%s", tempfile);
 385                 }
 386
 387                 if (compare(temp_fd, tempfile, (size_t)temp_sb.st_size, to_fd,
 388                             to_name, (size_t)to_sb.st_size) == 0) {
 389                         /*
 390                          * If target has more than one link we need to
 391                          * replace it in order to snap the extra links.
 392                          * Need to preserve target file times, though.
 393                          */
 394                         if (to_sb.st_nlink != 1) {
 395                                 utb.actime = to_sb.st_atime;
 396                                 utb.modtime = to_sb.st_mtime;
 397                                 (void)utime(tempfile, &utb);
 398                         } else {
 399                                 files_match = 1;
 400                                 (void)unlink(tempfile);
 401                         }
 402                         (void) close(temp_fd);
 403                 }
 404         }
 405
 406         /*
 407          * Move the new file into place if doing a safe copy
 408          * and the files are different (or just not compared).
 409          */
 410         if (tempcopy && !files_match) {
 411                 /* Try to turn off the immutable bits. */
 412                 if (to_sb.st_flags & NOCHANGEBITS)
 413                         (void)chflags(to_name, to_sb.st_flags & ~NOCHANGEBITS);
 414                 if (dobackup) {
 415                         if (snprintf(backup, MAXPATHLEN, "%s%s", to_name,
 416                             suffix) != strlen(to_name) + strlen(suffix)) {
 417                                 unlink(tempfile);
 418                                 errx(EX_OSERR, "%s: backup filename too long",
 419                                     to_name);
 420                         }
 421                         if (verbose)
 422                                 (void)printf("install: %s -> %s\n", to_name, backup);
 423                         if (rename(to_name, backup) < 0) {
 424                                 serrno = errno;
 425                                 unlink(tempfile);
 426                                 errno = serrno;
 427                                 err(EX_OSERR, "rename: %s to %s", to_name,
 428                                      backup);
 429                         }
 430                 }
 431                 if (verbose)
 432                         (void)printf("install: %s -> %s\n", from_name, to_name);
 433                 if (rename(tempfile, to_name) < 0) {
 434                         serrno = errno;
 435                         unlink(tempfile);
 436                         errno = serrno;
 437                         err(EX_OSERR, "rename: %s to %s",
 438                             tempfile, to_name);
 439                 }
 440
 441                 /* Re-open to_fd so we aren't hosed by the rename(2). */
 442                 (void) close(to_fd);
 443                 if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
 444                         err(EX_OSERR, "%s", to_name);
 445         }
 446
 447 #ifdef __APPLE__
 448         /* in case mtime is modified */
 449         if (!devnull && (S_ISLNK(from_sb.st_mode) || S_ISREG(from_sb.st_mode)) &&
 450             fcopyfile(from_fd, to_fd, NULL, COPYFILE_XATTR) < 0) {
 451                 warn("%s: unable to copy extended attributes from %s", to_name, from_name);
 452         }
 453 #endif  /* __APPLE__ */
 454         /*
 455          * Preserve the timestamp of the source file if necessary.
 456          */
 457         if (dopreserve && !files_match && !devnull) {
 458                 utb.actime = from_sb.st_atime;
 459                 utb.modtime = from_sb.st_mtime;
 460                 (void)utime(to_name, &utb);
 461         }
 462
 463         if (fstat(to_fd, &to_sb) == -1) {
 464                 serrno = errno;
 465                 (void)unlink(to_name);
 466                 errno = serrno;
 467                 err(EX_OSERR, "%s", to_name);
 468         }
 469
 470         /*
 471          * Set owner, group, mode for target; do the chown first,
 472          * chown may lose the setuid bits.
 473          */
 474         if ((gid != (gid_t)-1 && gid != to_sb.st_gid) ||
 475             (uid != (uid_t)-1 && uid != to_sb.st_uid) ||
 476             (mode != to_sb.st_mode)) {
 477                 /* Try to turn off the immutable bits. */
 478                 if (to_sb.st_flags & NOCHANGEBITS)
 479                         (void)fchflags(to_fd, to_sb.st_flags & ~NOCHANGEBITS);
 480         }
 481
 482         if ((gid != (gid_t)-1 && gid != to_sb.st_gid) ||
 483             (uid != (uid_t)-1 && uid != to_sb.st_uid))
 484                 if (fchown(to_fd, uid, gid) == -1) {
 485                         serrno = errno;
 486                         (void)unlink(to_name);
 487                         errno = serrno;
 488                         err(EX_OSERR,"%s: chown/chgrp", to_name);
 489                 }
 490
 491         if (mode != to_sb.st_mode)
 492                 if (fchmod(to_fd, mode)) {
 493                         serrno = errno;
 494                         (void)unlink(to_name);
 495                         errno = serrno;
 496                         err(EX_OSERR, "%s: chmod", to_name);
 497                 }
 498
 499         /*
 500          * If provided a set of flags, set them, otherwise, preserve the
 501          * flags, except for the dump flag.
 502          * NFS does not support flags.  Ignore ENOTSUP flags if we're just
 503          * trying to turn off UF_NODUMP.  If we're trying to set real flags,
 504          * then warn if the the fs doesn't support it, otherwise fail.
 505          */
 506         if (!devnull && fchflags(to_fd,
 507             flags & SETFLAGS ? fset : from_sb.st_flags & ~UF_NODUMP)) {
 508                 if (flags & SETFLAGS) {
 509                         if (errno == ENOTSUP)
 510                                 warn("%s: chflags", to_name);
 511                         else {
 512                                 serrno = errno;
 513                                 (void)unlink(to_name);
 514                                 errno = serrno;
 515                                 err(EX_OSERR, "%s: chflags", to_name);
 516                         }
 517                 }
 518         }
 519 #ifdef __APPLE__
 520         /* the ACL could prevent credential/permission system calls later on... */
 521         if (!devnull && (S_ISLNK(from_sb.st_mode) || S_ISREG(from_sb.st_mode)) &&
 522             (fcopyfile(from_fd, to_fd, NULL, COPYFILE_ACL) < 0)) {
 523                 warn("%s: unable to copy ACL from %s", to_name, from_name);
 524         }
 525 #endif  /* __APPLE__ */
 526
 527         (void)close(to_fd);
 528         if (!devnull)
 529                 (void)close(from_fd);
 530 }
 531 #if TARGET_OS_EMBEDDED
 532 #define BUFFER_SIZE 128*1024
 533 #else  /* !TARGET_OS_EMBEDDED */
 534 #define BUFFER_SIZE MAXBSIZE
 535 #endif  /* TARGET_OS_EMBEDDED */
 536 /*
 537  * compare --
 538  *      compare two files; non-zero means files differ
 539  */
 540 int
 541 compare(int from_fd, const char *from_name, size_t from_len,
 542         int to_fd, const char *to_name, size_t to_len)
 543 {
 544         char *p, *q;
 545         int rv;
 546         int done_compare;
 547
 548         rv = 0;
 549         if (from_len != to_len)
 550                 return 1;
 551
 552         if (from_len <= 8 * 1024 * 1024) {
 553                 done_compare = 0;
 554                 if (trymmap(from_fd) && trymmap(to_fd)) {
 555                         p = mmap(NULL, from_len, PROT_READ, MAP_SHARED, from_fd, (off_t)0);
 556                         if (p == (char *)MAP_FAILED)
 557                                 goto out;
 558                         q = mmap(NULL, from_len, PROT_READ, MAP_SHARED, to_fd, (off_t)0);
 559                         if (q == (char *)MAP_FAILED) {
 560                                 munmap(p, from_len);
 561                                 goto out;
 562                         }
 563
 564                         rv = memcmp(p, q, from_len);
 565                         munmap(p, from_len);
 566                         munmap(q, from_len);
 567                         done_compare = 1;
 568                 }
 569         out:
 570                 if (!done_compare) {
 571                         char buf1[BUFFER_SIZE];
 572                         char buf2[BUFFER_SIZE];
 573                         int n1, n2;
 574
 575                         rv = 0;
 576                         lseek(from_fd, 0, SEEK_SET);
 577                         lseek(to_fd, 0, SEEK_SET);
 578                         while (rv == 0) {
 579                                 n1 = read(from_fd, buf1, sizeof(buf1));
 580                                 if (n1 == 0)
 581                                         break;          /* EOF */
 582                                 else if (n1 > 0) {
 583                                         n2 = read(to_fd, buf2, n1);
 584                                         if (n2 == n1)
 585                                                 rv = memcmp(buf1, buf2, n1);
 586                                         else
 587                                                 rv = 1; /* out of sync */
 588                                 } else
 589                                         rv = 1;         /* read failure */
 590                         }
 591                         lseek(from_fd, 0, SEEK_SET);
 592                         lseek(to_fd, 0, SEEK_SET);
 593                 }
 594         } else
 595                 rv = 1; /* don't bother in this case */
 596
 597         return rv;
 598 }
 599
 600 /*
 601  * create_tempfile --
 602  *      create a temporary file based on path and open it
 603  */
 604 int
 605 create_tempfile(path, temp, tsize)
 606         char *path;
 607         char *temp;
 608         size_t tsize;
 609 {
 610         char *p;
 611
 612         (void)strncpy(temp, path, tsize);
 613         temp[tsize - 1] = '\0';
 614         if ((p = strrchr(temp, '/')) != NULL)
 615                 p++;
 616         else
 617                 p = temp;
 618         (void)strncpy(p, "INS@XXXX", &temp[tsize - 1] - p);
 619         temp[tsize - 1] = '\0';
 620         return (mkstemp(temp));
 621 }
 622
 623 /*
 624  * create_newfile --
 625  *      create a new file, overwriting an existing one if necessary
 626  */
 627 int
 628 create_newfile(path, target, sbp)
 629         char *path;
 630         int target;
 631         struct stat *sbp;
 632 {
 633         char backup[MAXPATHLEN];
 634
 635         if (target) {
 636                 /*
 637                  * Unlink now... avoid ETXTBSY errors later.  Try to turn
 638                  * off the append/immutable bits -- if we fail, go ahead,
 639                  * it might work.
 640                  */
 641                 if (sbp->st_flags & NOCHANGEBITS)
 642                         (void)chflags(path, sbp->st_flags & ~NOCHANGEBITS);
 643
 644                 if (dobackup) {
 645                         if (snprintf(backup, MAXPATHLEN, "%s%s",
 646                             path, suffix) != strlen(path) + strlen(suffix))
 647                                 errx(EX_OSERR, "%s: backup filename too long",
 648                                     path);
 649                         (void)snprintf(backup, MAXPATHLEN, "%s%s",
 650                             path, suffix);
 651                         if (verbose)
 652                                 (void)printf("install: %s -> %s\n",
 653                                     path, backup);
 654                         if (rename(path, backup) < 0)
 655                                 err(EX_OSERR, "rename: %s to %s", path, backup);
 656                 } else
 657                         (void)unlink(path);
 658         }
 659
 660         return (open(path, O_CREAT | O_RDWR | O_TRUNC, S_IRUSR | S_IWUSR));
 661 }
 662
 663 /*
 664  * copy --
 665  *      copy from one file to another
 666  */
 667 void
 668 copy(from_fd, from_name, to_fd, to_name, size)
 669         register int from_fd, to_fd;
 670         char *from_name, *to_name;
 671         off_t size;
 672 {
 673         register int nr, nw;
 674         int serrno;
 675         char *p, buf[BUFFER_SIZE];
 676         int done_copy;
 677
 678         /* Rewind file descriptors. */
 679         if (lseek(from_fd, (off_t)0, SEEK_SET) == (off_t)-1)
 680                 err(EX_OSERR, "lseek: %s", from_name);
 681         if (lseek(to_fd, (off_t)0, SEEK_SET) == (off_t)-1)
 682                 err(EX_OSERR, "lseek: %s", to_name);
 683
 684         /*
 685          * Mmap and write if less than 8M (the limit is so we don't totally
 686          * trash memory on big files.  This is really a minor hack, but it
 687          * wins some CPU back.
 688          */
 689         done_copy = 0;
 690         if (size <= 8 * 1048576 && trymmap(from_fd) &&
 691             (p = mmap(NULL, (size_t)size, PROT_READ, MAP_SHARED,
 692                     from_fd, (off_t)0)) != (char *)MAP_FAILED) {
 693                 if ((nw = write(to_fd, p, size)) != size) {
 694                         serrno = errno;
 695                         (void)unlink(to_name);
 696                         errno = nw > 0 ? EIO : serrno;
 697                         err(EX_OSERR, "%s", to_name);
 698                 }
 699                 done_copy = 1;
 700         }
 701         if (!done_copy) {
 702                 while ((nr = read(from_fd, buf, sizeof(buf))) > 0)
 703                         if ((nw = write(to_fd, buf, nr)) != nr) {
 704                                 serrno = errno;
 705                                 (void)unlink(to_name);
 706                                 errno = nw > 0 ? EIO : serrno;
 707                                 err(EX_OSERR, "%s", to_name);
 708                         }
 709                 if (nr != 0) {
 710                         serrno = errno;
 711                         (void)unlink(to_name);
 712                         errno = serrno;
 713                         err(EX_OSERR, "%s", from_name);
 714                 }
 715         }
 716 }
 717
 718 /*
 719  * strip --
 720  *      use strip(1) to strip the target file
 721  */
 722 void
 723 strip(to_name)
 724         char *to_name;
 725 {
 726         pid_t pid;
 727         int error;
 728         extern char** environ;
 729         char *const argv[] = { "xcrun", "strip", "-", to_name, NULL };
 730
 731         if (0 == (error = posix_spawnp(&pid, "xcrun", NULL, NULL, argv, environ))) {
 732                 int status = 0;
 733                 pid_t child = waitpid(pid, &status, 0);
 734                 if ((child == -1) || status) {
 735                         unlink(to_name);
 736                         errx(EX_SOFTWARE, "child process failed: xcrun strip - %s", to_name);
 737                 }
 738         } else {
 739                 errno = error;
 740                 err(EX_OSERR, "xcrun strip - %s", to_name);
 741         }
 742 }
 743
 744 /*
 745  * install_dir --
 746  *      build directory heirarchy
 747  */
 748 void
 749 install_dir(path)
 750         char *path;
 751 {
 752         register char *p;
 753         struct stat sb;
 754         int ch;
 755
 756         for (p = path;; ++p)
 757                 if (!*p || (p != path && *p  == '/')) {
 758                         ch = *p;
 759                         *p = '\0';
 760                         if (stat(path, &sb)) {
 761                                 if (errno != ENOENT || mkdir(path, 0755) < 0) {
 762                                         err(EX_OSERR, "mkdir %s", path);
 763                                         /* NOTREACHED */
 764                                 } else if (verbose)
 765                                         (void)printf("install: mkdir %s\n",
 766                                                      path);
 767                         } else if (!S_ISDIR(sb.st_mode))
 768                                 errx(EX_OSERR, "%s exists but is not a directory", path);
 769                         if (!(*p = ch))
 770                                 break;
 771                 }
 772
 773         if ((gid != (gid_t)-1 || uid != (uid_t)-1) && chown(path, uid, gid))
 774                 warn("chown %u:%u %s", uid, gid, path);
 775         if (chmod(path, mode))
 776                 warn("chmod %o %s", mode, path);
 777 }
 778
 779 /*
 780  * usage --
 781  *      print a usage message and die
 782  */
 783 void
 784 usage()
 785 {
 786         (void)fprintf(stderr, "\
 787 usage: install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]\n\
 788                [-o owner] file1 file2\n\
 789        install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]\n\
 790                [-o owner] file1 ... fileN directory\n\
 791        install -d [-v] [-g group] [-m mode] [-o owner] directory ...\n");
 792         exit(EX_USAGE);
 793         /* NOTREACHED */
 794 }
 795
 796 /*
 797  * trymmap --
 798  *      return true (1) if mmap should be tried, false (0) if not.
 799  */
 800 int
 801 trymmap(fd)
 802         int fd;
 803 {
 804 /*
 805  * The ifdef is for bootstrapping - f_fstypename doesn't exist in
 806  * pre-Lite2-merge systems.
 807  */
 808 #ifdef MFSNAMELEN
 809         struct statfs stfs;
 810
 811         if (nommap || fstatfs(fd, &stfs) != 0)
 812                 return (0);
 813         if (strcmp(stfs.f_fstypename, "ufs") == 0 ||
 814             strcmp(stfs.f_fstypename, "cd9660") == 0)
 815                 return (1);
 816 #endif
 817         return (0);
 818 }