usr.bin/xinstall/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 #if 0
  41 #ifndef lint
  42 static char sccsid[] = "@(#)xinstall.c  8.1 (Berkeley) 7/21/93";
  43 #endif /* not lint */
  44 #endif
  45
  46 #include <sys/cdefs.h>
  47 __FBSDID("$FreeBSD$");
  48
  49 #include <sys/param.h>
  50 #include <sys/mman.h>
  51 #include <sys/mount.h>
  52 #include <sys/stat.h>
  53 #include <sys/time.h>
  54 #include <sys/wait.h>
  55
  56 #include <ctype.h>
  57 #include <err.h>
  58 #include <errno.h>
  59 #include <fcntl.h>
  60 #include <grp.h>
  61 #include <paths.h>
  62 #include <pwd.h>
  63 #include <stdio.h>
  64 #include <stdlib.h>
  65 #include <string.h>
  66 #include <sysexits.h>
  67 #include <unistd.h>
  68
  69 /* Bootstrap aid - this doesn't exist in most older releases */
  70 #ifndef MAP_FAILED
  71 #define MAP_FAILED ((void *)-1) /* from <sys/mman.h> */
  72 #endif
  73
  74 #define MAX_CMP_SIZE    (16 * 1024 * 1024)
  75
  76 #define DIRECTORY       0x01            /* Tell install it's a directory. */
  77 #define SETFLAGS        0x02            /* Tell install to set flags. */
  78 #define NOCHANGEBITS    (UF_IMMUTABLE | UF_APPEND | SF_IMMUTABLE | SF_APPEND)
  79 #define BACKUP_SUFFIX   ".old"
  80
  81 struct passwd *pp;
  82 struct group *gp;
  83 gid_t gid;
  84 uid_t uid;
  85 int dobackup, docompare, dodir, dopreserve, dostrip, nommap, safecopy, verbose;
  86 mode_t mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
  87 const char *suffix = BACKUP_SUFFIX;
  88
  89 void    copy(int, const char *, int, const char *, off_t);
  90 int     compare(int, const char *, size_t, int, const char *, size_t);
  91 int     create_newfile(const char *, int, struct stat *);
  92 int     create_tempfile(const char *, char *, size_t);
  93 void    install(const char *, const char *, u_long, u_int);
  94 void    install_dir(char *);
  95 u_long  numeric_id(const char *, const char *);
  96 void    strip(const char *);
  97 int     trymmap(int);
  98 void    usage(void);
  99
 100 int
 101 main(int argc, char *argv[])
 102 {
 103         struct stat from_sb, to_sb;
 104         mode_t *set;
 105         u_long fset;
 106         int ch, no_target;
 107         u_int iflags;
 108         char *flags;
 109         const char *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 (dostrip && dodir) {
 173                 warnx("-d and -s may not be specified together");
 174                 usage();
 175         }
 176
 177         if (getenv("DONTSTRIP") != NULL) {
 178                 warnx("DONTSTRIP set - will not strip installed binaries");
 179                 dostrip = 0;
 180         }
 181
 182         /* must have at least two arguments, except when creating directories */
 183         if (argc == 0 || (argc == 1 && !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 = (gid_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                 if (no_target)
 225                         warnx("target directory `%s' does not exist",
 226                             argv[argc - 1]);
 227                 else
 228                         warnx("target `%s' is not a directory",
 229                             argv[argc - 1]);
 230                 usage();
 231         }
 232
 233         if (!no_target) {
 234                 if (stat(*argv, &from_sb))
 235                         err(EX_OSERR, "%s", *argv);
 236                 if (!S_ISREG(to_sb.st_mode)) {
 237                         errno = EFTYPE;
 238                         err(EX_OSERR, "%s", to_name);
 239                 }
 240                 if (to_sb.st_dev == from_sb.st_dev &&
 241                     to_sb.st_ino == from_sb.st_ino)
 242                         errx(EX_USAGE,
 243                             "%s and %s are the same file", *argv, to_name);
 244         }
 245         install(*argv, to_name, fset, iflags);
 246         exit(EX_OK);
 247         /* NOTREACHED */
 248 }
 249
 250 u_long
 251 numeric_id(const char *name, const char *type)
 252 {
 253         u_long val;
 254         char *ep;
 255
 256         /*
 257          * XXX
 258          * We know that uid_t's and gid_t's are unsigned longs.
 259          */
 260         errno = 0;
 261         val = strtoul(name, &ep, 10);
 262         if (errno)
 263                 err(EX_NOUSER, "%s", name);
 264         if (*ep != '\0')
 265                 errx(EX_NOUSER, "unknown %s %s", type, name);
 266         return (val);
 267 }
 268
 269 /*
 270  * install --
 271  *      build a path name and install the file
 272  */
 273 void
 274 install(const char *from_name, const char *to_name, u_long fset, u_int flags)
 275 {
 276         struct stat from_sb, temp_sb, to_sb;
 277         struct timeval tvb[2];
 278         int devnull, files_match, from_fd, serrno, target;
 279         int tempcopy, temp_fd, to_fd;
 280         char backup[MAXPATHLEN], *p, pathbuf[MAXPATHLEN], tempfile[MAXPATHLEN];
 281
 282         files_match = 0;
 283         from_fd = -1;
 284         to_fd = -1;
 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                                 tvb[0].tv_sec = to_sb.st_atime;
 395                                 tvb[0].tv_usec = 0;
 396                                 tvb[1].tv_sec = to_sb.st_mtime;
 397                                 tvb[1].tv_usec = 0;
 398                                 (void)utimes(tempfile, tvb);
 399                         } else {
 400                                 files_match = 1;
 401                                 (void)unlink(tempfile);
 402                         }
 403                         (void) close(temp_fd);
 404                 }
 405         }
 406
 407         /*
 408          * Move the new file into place if doing a safe copy
 409          * and the files are different (or just not compared).
 410          */
 411         if (tempcopy && !files_match) {
 412                 /* Try to turn off the immutable bits. */
 413                 if (to_sb.st_flags & NOCHANGEBITS)
 414                         (void)chflags(to_name, to_sb.st_flags & ~NOCHANGEBITS);
 415                 if (dobackup) {
 416                         if ((size_t)snprintf(backup, MAXPATHLEN, "%s%s", to_name,
 417                             suffix) != strlen(to_name) + strlen(suffix)) {
 418                                 unlink(tempfile);
 419                                 errx(EX_OSERR, "%s: backup filename too long",
 420                                     to_name);
 421                         }
 422                         if (verbose)
 423                                 (void)printf("install: %s -> %s\n", to_name, backup);
 424                         if (rename(to_name, backup) < 0) {
 425                                 serrno = errno;
 426                                 unlink(tempfile);
 427                                 errno = serrno;
 428                                 err(EX_OSERR, "rename: %s to %s", to_name,
 429                                      backup);
 430                         }
 431                 }
 432                 if (verbose)
 433                         (void)printf("install: %s -> %s\n", from_name, to_name);
 434                 if (rename(tempfile, to_name) < 0) {
 435                         serrno = errno;
 436                         unlink(tempfile);
 437                         errno = serrno;
 438                         err(EX_OSERR, "rename: %s to %s",
 439                             tempfile, to_name);
 440                 }
 441
 442                 /* Re-open to_fd so we aren't hosed by the rename(2). */
 443                 (void) close(to_fd);
 444                 if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
 445                         err(EX_OSERR, "%s", to_name);
 446         }
 447
 448         /*
 449          * Preserve the timestamp of the source file if necessary.
 450          */
 451         if (dopreserve && !files_match && !devnull) {
 452                 tvb[0].tv_sec = from_sb.st_atime;
 453                 tvb[0].tv_usec = 0;
 454                 tvb[1].tv_sec = from_sb.st_mtime;
 455                 tvb[1].tv_usec = 0;
 456                 (void)utimes(to_name, tvb);
 457         }
 458
 459         if (fstat(to_fd, &to_sb) == -1) {
 460                 serrno = errno;
 461                 (void)unlink(to_name);
 462                 errno = serrno;
 463                 err(EX_OSERR, "%s", to_name);
 464         }
 465
 466         /*
 467          * Set owner, group, mode for target; do the chown first,
 468          * chown may lose the setuid bits.
 469          */
 470         if ((gid != (gid_t)-1 && gid != to_sb.st_gid) ||
 471             (uid != (uid_t)-1 && uid != to_sb.st_uid) ||
 472             (mode != (to_sb.st_mode & ALLPERMS))) {
 473                 /* Try to turn off the immutable bits. */
 474                 if (to_sb.st_flags & NOCHANGEBITS)
 475                         (void)fchflags(to_fd, to_sb.st_flags & ~NOCHANGEBITS);
 476         }
 477
 478         if ((gid != (gid_t)-1 && gid != to_sb.st_gid) ||
 479             (uid != (uid_t)-1 && uid != to_sb.st_uid))
 480                 if (fchown(to_fd, uid, gid) == -1) {
 481                         serrno = errno;
 482                         (void)unlink(to_name);
 483                         errno = serrno;
 484                         err(EX_OSERR,"%s: chown/chgrp", to_name);
 485                 }
 486
 487         if (mode != (to_sb.st_mode & ALLPERMS))
 488                 if (fchmod(to_fd, mode)) {
 489                         serrno = errno;
 490                         (void)unlink(to_name);
 491                         errno = serrno;
 492                         err(EX_OSERR, "%s: chmod", to_name);
 493                 }
 494
 495         /*
 496          * If provided a set of flags, set them, otherwise, preserve the
 497          * flags, except for the dump flag.
 498          * NFS does not support flags.  Ignore EOPNOTSUPP flags if we're just
 499          * trying to turn off UF_NODUMP.  If we're trying to set real flags,
 500          * then warn if the the fs doesn't support it, otherwise fail.
 501          */
 502         if (!devnull && (flags & SETFLAGS ||
 503             (from_sb.st_flags & ~UF_NODUMP) != to_sb.st_flags) &&
 504             fchflags(to_fd,
 505             flags & SETFLAGS ? fset : from_sb.st_flags & ~UF_NODUMP)) {
 506                 if (flags & SETFLAGS) {
 507                         if (errno == EOPNOTSUPP)
 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
 518         (void)close(to_fd);
 519         if (!devnull)
 520                 (void)close(from_fd);
 521 }
 522
 523 /*
 524  * compare --
 525  *      compare two files; non-zero means files differ
 526  */
 527 int
 528 compare(int from_fd, const char *from_name __unused, size_t from_len,
 529         int to_fd, const char *to_name __unused, size_t to_len)
 530 {
 531         char *p, *q;
 532         int rv;
 533         int done_compare;
 534
 535         rv = 0;
 536         if (from_len != to_len)
 537                 return 1;
 538
 539         if (from_len <= MAX_CMP_SIZE) {
 540                 done_compare = 0;
 541                 if (trymmap(from_fd) && trymmap(to_fd)) {
 542                         p = mmap(NULL, from_len, PROT_READ, MAP_SHARED, from_fd, (off_t)0);
 543                         if (p == (char *)MAP_FAILED)
 544                                 goto out;
 545                         q = mmap(NULL, from_len, PROT_READ, MAP_SHARED, to_fd, (off_t)0);
 546                         if (q == (char *)MAP_FAILED) {
 547                                 munmap(p, from_len);
 548                                 goto out;
 549                         }
 550
 551                         rv = memcmp(p, q, from_len);
 552                         munmap(p, from_len);
 553                         munmap(q, from_len);
 554                         done_compare = 1;
 555                 }
 556         out:
 557                 if (!done_compare) {
 558                         char buf1[MAXBSIZE];
 559                         char buf2[MAXBSIZE];
 560                         int n1, n2;
 561
 562                         rv = 0;
 563                         lseek(from_fd, 0, SEEK_SET);
 564                         lseek(to_fd, 0, SEEK_SET);
 565                         while (rv == 0) {
 566                                 n1 = read(from_fd, buf1, sizeof(buf1));
 567                                 if (n1 == 0)
 568                                         break;          /* EOF */
 569                                 else if (n1 > 0) {
 570                                         n2 = read(to_fd, buf2, n1);
 571                                         if (n2 == n1)
 572                                                 rv = memcmp(buf1, buf2, n1);
 573                                         else
 574                                                 rv = 1; /* out of sync */
 575                                 } else
 576                                         rv = 1;         /* read failure */
 577                         }
 578                         lseek(from_fd, 0, SEEK_SET);
 579                         lseek(to_fd, 0, SEEK_SET);
 580                 }
 581         } else
 582                 rv = 1; /* don't bother in this case */
 583
 584         return rv;
 585 }
 586
 587 /*
 588  * create_tempfile --
 589  *      create a temporary file based on path and open it
 590  */
 591 int
 592 create_tempfile(const char *path, char *temp, size_t tsize)
 593 {
 594         char *p;
 595
 596         (void)strncpy(temp, path, tsize);
 597         temp[tsize - 1] = '\0';
 598         if ((p = strrchr(temp, '/')) != NULL)
 599                 p++;
 600         else
 601                 p = temp;
 602         (void)strncpy(p, "INS@XXXX", &temp[tsize - 1] - p);
 603         temp[tsize - 1] = '\0';
 604         return (mkstemp(temp));
 605 }
 606
 607 /*
 608  * create_newfile --
 609  *      create a new file, overwriting an existing one if necessary
 610  */
 611 int
 612 create_newfile(const char *path, int target, struct stat *sbp)
 613 {
 614         char backup[MAXPATHLEN];
 615         int saved_errno = 0;
 616         int newfd;
 617
 618         if (target) {
 619                 /*
 620                  * Unlink now... avoid ETXTBSY errors later.  Try to turn
 621                  * off the append/immutable bits -- if we fail, go ahead,
 622                  * it might work.
 623                  */
 624                 if (sbp->st_flags & NOCHANGEBITS)
 625                         (void)chflags(path, sbp->st_flags & ~NOCHANGEBITS);
 626
 627                 if (dobackup) {
 628                         if ((size_t)snprintf(backup, MAXPATHLEN, "%s%s",
 629                             path, suffix) != strlen(path) + strlen(suffix))
 630                                 errx(EX_OSERR, "%s: backup filename too long",
 631                                     path);
 632                         (void)snprintf(backup, MAXPATHLEN, "%s%s",
 633                             path, suffix);
 634                         if (verbose)
 635                                 (void)printf("install: %s -> %s\n",
 636                                     path, backup);
 637                         if (rename(path, backup) < 0)
 638                                 err(EX_OSERR, "rename: %s to %s", path, backup);
 639                 } else
 640                         if (unlink(path) < 0)
 641                                 saved_errno = errno;
 642         }
 643
 644         newfd = open(path, O_CREAT | O_RDWR | O_TRUNC, S_IRUSR | S_IWUSR);
 645         if (newfd < 0 && saved_errno != 0)
 646                 errno = saved_errno;
 647         return newfd;
 648 }
 649
 650 /*
 651  * copy --
 652  *      copy from one file to another
 653  */
 654 void
 655 copy(int from_fd, const char *from_name, int to_fd, const char *to_name,
 656     off_t size)
 657 {
 658         int nr, nw;
 659         int serrno;
 660         char *p, buf[MAXBSIZE];
 661         int done_copy;
 662
 663         /* Rewind file descriptors. */
 664         if (lseek(from_fd, (off_t)0, SEEK_SET) == (off_t)-1)
 665                 err(EX_OSERR, "lseek: %s", from_name);
 666         if (lseek(to_fd, (off_t)0, SEEK_SET) == (off_t)-1)
 667                 err(EX_OSERR, "lseek: %s", to_name);
 668
 669         /*
 670          * Mmap and write if less than 8M (the limit is so we don't totally
 671          * trash memory on big files.  This is really a minor hack, but it
 672          * wins some CPU back.
 673          */
 674         done_copy = 0;
 675         if (size <= 8 * 1048576 && trymmap(from_fd) &&
 676             (p = mmap(NULL, (size_t)size, PROT_READ, MAP_SHARED,
 677                     from_fd, (off_t)0)) != (char *)MAP_FAILED) {
 678                 if ((nw = write(to_fd, p, size)) != size) {
 679                         serrno = errno;
 680                         (void)unlink(to_name);
 681                         errno = nw > 0 ? EIO : serrno;
 682                         err(EX_OSERR, "%s", to_name);
 683                 }
 684                 done_copy = 1;
 685         }
 686         if (!done_copy) {
 687                 while ((nr = read(from_fd, buf, sizeof(buf))) > 0)
 688                         if ((nw = write(to_fd, buf, nr)) != nr) {
 689                                 serrno = errno;
 690                                 (void)unlink(to_name);
 691                                 errno = nw > 0 ? EIO : serrno;
 692                                 err(EX_OSERR, "%s", to_name);
 693                         }
 694                 if (nr != 0) {
 695                         serrno = errno;
 696                         (void)unlink(to_name);
 697                         errno = serrno;
 698                         err(EX_OSERR, "%s", from_name);
 699                 }
 700         }
 701 }
 702
 703 /*
 704  * strip --
 705  *      use strip(1) to strip the target file
 706  */
 707 void
 708 strip(const char *to_name)
 709 {
 710         const char *stripbin;
 711         int serrno, status;
 712
 713         switch (fork()) {
 714         case -1:
 715                 serrno = errno;
 716                 (void)unlink(to_name);
 717                 errno = serrno;
 718                 err(EX_TEMPFAIL, "fork");
 719         case 0:
 720                 stripbin = getenv("STRIPBIN");
 721                 if (stripbin == NULL)
 722                         stripbin = "strip";
 723                 execlp(stripbin, stripbin, to_name, (char *)NULL);
 724                 err(EX_OSERR, "exec(%s)", stripbin);
 725         default:
 726                 if (wait(&status) == -1 || status) {
 727                         serrno = errno;
 728                         (void)unlink(to_name);
 729                         errc(EX_SOFTWARE, serrno, "wait");
 730                         /* NOTREACHED */
 731                 }
 732         }
 733 }
 734
 735 /*
 736  * install_dir --
 737  *      build directory heirarchy
 738  */
 739 void
 740 install_dir(char *path)
 741 {
 742         char *p;
 743         struct stat sb;
 744         int ch;
 745
 746         for (p = path;; ++p)
 747                 if (!*p || (p != path && *p  == '/')) {
 748                         ch = *p;
 749                         *p = '\0';
 750                         if (stat(path, &sb)) {
 751                                 if (errno != ENOENT || mkdir(path, 0755) < 0) {
 752                                         err(EX_OSERR, "mkdir %s", path);
 753                                         /* NOTREACHED */
 754                                 } else if (verbose)
 755                                         (void)printf("install: mkdir %s\n",
 756                                                      path);
 757                         } else if (!S_ISDIR(sb.st_mode))
 758                                 errx(EX_OSERR, "%s exists but is not a directory", path);
 759                         if (!(*p = ch))
 760                                 break;
 761                 }
 762
 763         if ((gid != (gid_t)-1 || uid != (uid_t)-1) && chown(path, uid, gid))
 764                 warn("chown %u:%u %s", uid, gid, path);
 765         if (chmod(path, mode))
 766                 warn("chmod %o %s", mode, path);
 767 }
 768
 769 /*
 770  * usage --
 771  *      print a usage message and die
 772  */
 773 void
 774 usage()
 775 {
 776         (void)fprintf(stderr,
 777 "usage: install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]\n"
 778 "               [-o owner] file1 file2\n"
 779 "       install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]\n"
 780 "               [-o owner] file1 ... fileN directory\n"
 781 "       install -d [-v] [-g group] [-m mode] [-o owner] directory ...\n");
 782         exit(EX_USAGE);
 783         /* NOTREACHED */
 784 }
 785
 786 /*
 787  * trymmap --
 788  *      return true (1) if mmap should be tried, false (0) if not.
 789  */
 790 int
 791 trymmap(int fd)
 792 {
 793 /*
 794  * The ifdef is for bootstrapping - f_fstypename doesn't exist in
 795  * pre-Lite2-merge systems.
 796  */
 797 #ifdef MFSNAMELEN
 798         struct statfs stfs;
 799
 800         if (nommap || fstatfs(fd, &stfs) != 0)
 801                 return (0);
 802         if (strcmp(stfs.f_fstypename, "ufs") == 0 ||
 803             strcmp(stfs.f_fstypename, "cd9660") == 0)
 804                 return (1);
 805 #endif
 806         return (0);
 807 }