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