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