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