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  * @(#) Copyright (c) 1987, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)xinstall.c       8.1 (Berkeley) 7/21/93
  35  * $FreeBSD: src/usr.bin/xinstall/xinstall.c,v 1.38.2.8 2002/08/07 16:29:48 ru Exp $
  36  * $DragonFly: src/usr.bin/xinstall/xinstall.c,v 1.6 2008/11/11 01:51:24 dillon Exp $
  37  */
  38
  39 #include <sys/param.h>
  40 #include <sys/mman.h>
  41 #include <sys/mount.h>
  42 #include <sys/stat.h>
  43 #include <sys/wait.h>
  44
  45 #include <ctype.h>
  46 #include <err.h>
  47 #include <errno.h>
  48 #include <fcntl.h>
  49 #include <grp.h>
  50 #include <paths.h>
  51 #include <pwd.h>
  52 #include <stdio.h>
  53 #include <stdlib.h>
  54 #include <string.h>
  55 #include <sysexits.h>
  56 #include <unistd.h>
  57 #include <utime.h>
  58
  59 #include "pathnames.h"
  60
  61 /* Bootstrap aid - this doesn't exist in most older releases */
  62 #ifndef MAP_FAILED
  63 #define MAP_FAILED ((void *)-1) /* from <sys/mman.h> */
  64 #endif
  65
  66 #define MAX_CMP_SIZE    (16 * 1024 * 1024)
  67
  68 #define DIRECTORY       0x01            /* Tell install it's a directory. */
  69 #define SETFLAGS        0x02            /* Tell install to set flags. */
  70 #define NOCHANGEBITS    (UF_IMMUTABLE | UF_APPEND | SF_IMMUTABLE | SF_APPEND)
  71 #define BACKUP_SUFFIX   ".old"
  72
  73 struct passwd *pp;
  74 struct group *gp;
  75 gid_t gid;
  76 uid_t uid;
  77 int dobackup, docompare, dodir, dopreserve, dostrip, nommap, safecopy, verbose;
  78 mode_t mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
  79 const char *suffix = BACKUP_SUFFIX;
  80
  81 static int file_getgroup(const char *etcdir, const char *group, gid_t *gid);
  82 static int file_getowner(const char *etcdir, const char *owner, uid_t *uid);
  83
  84 void    copy(int, const char *, int, const char *, off_t);
  85 int     compare(int, const char *, size_t, int, const char *, size_t);
  86 int     create_newfile(const char *, int, struct stat *);
  87 int     create_tempfile(const char *, char *, size_t);
  88 void    install(const char *, const char *, u_long, u_long, u_int);
  89 void    install_dir(char *);
  90 u_long  numeric_id(const char *, const char *);
  91 void    strip(const char *);
  92 int     trymmap(int);
  93 void    usage(void);
  94
  95 int
  96 main(int argc, char **argv)
  97 {
  98         struct stat from_sb, to_sb;
  99         mode_t *set;
 100         u_long fset;
 101         u_long fclr;
 102         int ch, no_target;
 103         int trysys;
 104         u_int iflags;
 105         char *flags;
 106         const char *group, *owner, *to_name;
 107         const char *etcdir;
 108
 109         iflags = 0;
 110         trysys = 0;
 111         group = NULL;
 112         owner = NULL;
 113         etcdir = NULL;
 114
 115         while ((ch = getopt(argc, argv, "L:B:bCcdf:g:lMm:o:pSsv")) != -1)
 116                 switch((char)ch) {
 117                 case 'L':
 118                         etcdir = optarg;
 119                         break;
 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, &fclr))
 138                                 errx(EX_USAGE, "%s: invalid flag", flags);
 139                         iflags |= SETFLAGS;
 140                         break;
 141                 case 'g':
 142                         group = optarg;
 143                         break;
 144                 case 'l':
 145                         trysys = 1;
 146                         break;
 147                 case 'M':
 148                         nommap = 1;
 149                         break;
 150                 case 'm':
 151                         if (!(set = setmode(optarg)))
 152                                 errx(EX_USAGE, "invalid file mode: %s",
 153                                      optarg);
 154                         mode = getmode(set, 0);
 155                         free(set);
 156                         break;
 157                 case 'o':
 158                         owner = optarg;
 159                         break;
 160                 case 'p':
 161                         docompare = dopreserve = 1;
 162                         break;
 163                 case 'S':
 164                         safecopy = 1;
 165                         break;
 166                 case 's':
 167                         dostrip = 1;
 168                         break;
 169                 case 'v':
 170                         verbose = 1;
 171                         break;
 172                 case '?':
 173                 default:
 174                         usage();
 175                 }
 176         argc -= optind;
 177         argv += optind;
 178
 179         /* some options make no sense when creating directories */
 180         if (dostrip && dodir)
 181                 usage();
 182
 183         /* must have at least two arguments, except when creating directories */
 184         if (argc < 2 && !dodir)
 185                 usage();
 186
 187         /* need to make a temp copy so we can compare stripped version */
 188         if (docompare && dostrip)
 189                 safecopy = 1;
 190
 191         /* no etcdir specified, always try the system */
 192         if (etcdir == NULL)
 193                 trysys = 1;
 194         uid = (uid_t)-1;
 195         gid = (gid_t)-1;
 196
 197         /* get group and owner id's */
 198         if (group != NULL) {
 199                 if (etcdir && file_getgroup(etcdir, group, &gid)) {
 200                         ;
 201                 } else if (trysys && (gp = getgrnam(group)) != NULL) {
 202                         gid = gp->gr_gid;
 203                 } else {
 204                         gid = (gid_t)numeric_id(group, "group");
 205                 }
 206         }
 207
 208         if (owner != NULL) {
 209                 if (etcdir && file_getowner(etcdir, owner, &uid)) {
 210                         ;
 211                 } else if (trysys && (pp = getpwnam(owner)) != NULL) {
 212                         uid = pp->pw_uid;
 213                 } else {
 214                         uid = (uid_t)numeric_id(owner, "user");
 215                 }
 216         }
 217
 218         if (dodir) {
 219                 for (; *argv != NULL; ++argv)
 220                         install_dir(*argv);
 221                 exit(EX_OK);
 222                 /* NOTREACHED */
 223         }
 224
 225         no_target = stat(to_name = argv[argc - 1], &to_sb);
 226         if (!no_target && S_ISDIR(to_sb.st_mode)) {
 227                 for (; *argv != to_name; ++argv)
 228                         install(*argv, to_name, fset, fclr, iflags | DIRECTORY);
 229                 exit(EX_OK);
 230                 /* NOTREACHED */
 231         }
 232
 233         /* can't do file1 file2 directory/file */
 234         if (argc != 2)
 235                 usage();
 236
 237         if (!no_target) {
 238                 if (stat(*argv, &from_sb))
 239                         err(EX_OSERR, "%s", *argv);
 240                 if (!S_ISREG(to_sb.st_mode)) {
 241                         errno = EFTYPE;
 242                         err(EX_OSERR, "%s", to_name);
 243                 }
 244                 if (to_sb.st_dev == from_sb.st_dev &&
 245                     to_sb.st_ino == from_sb.st_ino)
 246                         errx(EX_USAGE,
 247                             "%s and %s are the same file", *argv, to_name);
 248         }
 249         install(*argv, to_name, fset, fclr, iflags);
 250         exit(EX_OK);
 251         /* NOTREACHED */
 252 }
 253
 254 u_long
 255 numeric_id(const char *name, const char *type)
 256 {
 257         u_long val;
 258         char *ep;
 259
 260         /*
 261          * XXX
 262          * We know that uid_t's and gid_t's are unsigned longs.
 263          */
 264         errno = 0;
 265         val = strtoul(name, &ep, 10);
 266         if (errno)
 267                 err(EX_NOUSER, "%s", name);
 268         if (*ep != '\0')
 269                 errx(EX_NOUSER, "unknown %s %s", type, name);
 270         return (val);
 271 }
 272
 273 static
 274 int
 275 file_getgroup(const char *etcdir, const char *group, gid_t *gid)
 276 {
 277         FILE *fp;
 278         size_t len;
 279         size_t grlen;
 280         char *path;
 281         char *ptr;
 282         char *scan;
 283
 284         grlen = strlen(group);
 285
 286         if (asprintf(&path, "%s/group", etcdir) < 0)
 287                 errx(EX_OSERR, "asprintf()");
 288         if ((fp = fopen(path, "r")) != NULL) {
 289                 while ((ptr = fgetln(fp, &len)) != NULL && len) {
 290                         ptr[len - 1] = 0;
 291                         if ((scan = strchr(ptr, ':')) == NULL)
 292                                 continue;
 293                         if (scan - ptr != grlen)
 294                                 continue;
 295                         if (strncmp(ptr, group, grlen) != 0)
 296                                 continue;
 297                         if ((scan = strchr(scan + 1, ':')) == NULL)
 298                                 continue;
 299                         *gid = strtoul(scan + 1, NULL, 10);
 300                         break;
 301                 }
 302                 fclose(fp);
 303         }
 304         free(path);
 305         return((*gid == (gid_t)-1) ? 0 : 1);
 306 }
 307
 308 static
 309 int
 310 file_getowner(const char *etcdir, const char *owner, uid_t *uid)
 311 {
 312         FILE *fp;
 313         size_t len;
 314         size_t owner_len;
 315         char *path;
 316         char *ptr;
 317         char *scan;
 318
 319         owner_len = strlen(owner);
 320
 321         if (asprintf(&path, "%s/master.passwd", etcdir) < 0)
 322                 errx(EX_OSERR, "asprintf()");
 323         if ((fp = fopen(path, "r")) != NULL) {
 324                 while ((ptr = fgetln(fp, &len)) != NULL && len) {
 325                         ptr[len - 1] = 0;
 326                         if ((scan = strchr(ptr, ':')) == NULL)
 327                                 continue;
 328                         if (scan - ptr != owner_len)
 329                                 continue;
 330                         if (strncmp(ptr, owner, owner_len) != 0)
 331                                 continue;
 332                         if ((scan = strchr(scan + 1, ':')) == NULL)
 333                                 continue;
 334                         *uid = strtoul(scan + 1, NULL, 10);
 335                         break;
 336                 }
 337                 fclose(fp);
 338         }
 339         free(path);
 340         return((*uid == (uid_t)-1) ? 0 : 1);
 341 }
 342
 343 /*
 344  * install --
 345  *      build a path name and install the file
 346  */
 347 void
 348 install(const char *from_name, const char *to_name, u_long fset, u_long fclr,
 349         u_int flags)
 350 {
 351         struct stat from_sb, temp_sb, to_sb;
 352         struct utimbuf utb;
 353         int devnull, files_match, from_fd, serrno, target;
 354         int tempcopy, temp_fd, to_fd;
 355         u_long nfset;
 356         char backup[MAXPATHLEN], *p, pathbuf[MAXPATHLEN], tempfile[MAXPATHLEN];
 357
 358         files_match = 0;
 359
 360         /* If try to install NULL file to a directory, fails. */
 361         if (flags & DIRECTORY || strcmp(from_name, _PATH_DEVNULL)) {
 362                 if (stat(from_name, &from_sb))
 363                         err(EX_OSERR, "%s", from_name);
 364                 if (!S_ISREG(from_sb.st_mode)) {
 365                         errno = EFTYPE;
 366                         err(EX_OSERR, "%s", from_name);
 367                 }
 368                 /* Build the target path. */
 369                 if (flags & DIRECTORY) {
 370                         snprintf(pathbuf, sizeof(pathbuf), "%s/%s",
 371                             to_name,
 372                             (p = strrchr(from_name, '/')) ? ++p : from_name);
 373                         to_name = pathbuf;
 374                 }
 375                 devnull = 0;
 376         } else {
 377                 devnull = 1;
 378         }
 379
 380         target = stat(to_name, &to_sb) == 0;
 381
 382         /* Only install to regular files. */
 383         if (target && !S_ISREG(to_sb.st_mode)) {
 384                 errno = EFTYPE;
 385                 warn("%s", to_name);
 386                 return;
 387         }
 388
 389         /* Only copy safe if the target exists. */
 390         tempcopy = safecopy && target;
 391
 392         if (!devnull && (from_fd = open(from_name, O_RDONLY, 0)) < 0)
 393                 err(EX_OSERR, "%s", from_name);
 394
 395         /* If we don't strip, we can compare first. */
 396         if (docompare && !dostrip && target) {
 397                 if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
 398                         err(EX_OSERR, "%s", to_name);
 399                 if (devnull)
 400                         files_match = to_sb.st_size == 0;
 401                 else
 402                         files_match = !(compare(from_fd, from_name,
 403                             (size_t)from_sb.st_size, to_fd,
 404                             to_name, (size_t)to_sb.st_size));
 405
 406                 /* Close "to" file unless we match. */
 407                 if (!files_match)
 408                         close(to_fd);
 409         }
 410
 411         if (!files_match) {
 412                 if (tempcopy) {
 413                         to_fd = create_tempfile(to_name, tempfile,
 414                             sizeof(tempfile));
 415                         if (to_fd < 0)
 416                                 err(EX_OSERR, "%s", tempfile);
 417                 } else {
 418                         if ((to_fd = create_newfile(to_name, target,
 419                             &to_sb)) < 0)
 420                                 err(EX_OSERR, "%s", to_name);
 421                         if (verbose)
 422                                 printf("install: %s -> %s\n",
 423                                     from_name, to_name);
 424                 }
 425                 if (!devnull)
 426                         copy(from_fd, from_name, to_fd,
 427                              tempcopy ? tempfile : to_name, from_sb.st_size);
 428         }
 429
 430         if (dostrip) {
 431                 strip(tempcopy ? tempfile : to_name);
 432
 433                 /*
 434                  * Re-open our fd on the target, in case we used a strip
 435                  * that does not work in-place -- like GNU binutils strip.
 436                  */
 437                 close(to_fd);
 438                 to_fd = open(tempcopy ? tempfile : to_name, O_RDONLY, 0);
 439                 if (to_fd < 0)
 440                         err(EX_OSERR, "stripping %s", to_name);
 441         }
 442
 443         /*
 444          * Compare the stripped temp file with the target.
 445          */
 446         if (docompare && dostrip && target) {
 447                 temp_fd = to_fd;
 448
 449                 /* Re-open to_fd using the real target name. */
 450                 if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
 451                         err(EX_OSERR, "%s", to_name);
 452
 453                 if (fstat(temp_fd, &temp_sb)) {
 454                         serrno = errno;
 455                         unlink(tempfile);
 456                         errno = serrno;
 457                         err(EX_OSERR, "%s", tempfile);
 458                 }
 459
 460                 if (compare(temp_fd, tempfile, (size_t)temp_sb.st_size, to_fd,
 461                             to_name, (size_t)to_sb.st_size) == 0) {
 462                         /*
 463                          * If target has more than one link we need to
 464                          * replace it in order to snap the extra links.
 465                          * Need to preserve target file times, though.
 466                          */
 467                         if (to_sb.st_nlink != 1) {
 468                                 utb.actime = to_sb.st_atime;
 469                                 utb.modtime = to_sb.st_mtime;
 470                                 utime(tempfile, &utb);
 471                         } else {
 472                                 files_match = 1;
 473                                 unlink(tempfile);
 474                         }
 475                         close(temp_fd);
 476                 }
 477         }
 478
 479         /*
 480          * Move the new file into place if doing a safe copy
 481          * and the files are different (or just not compared).
 482          */
 483         if (tempcopy && !files_match) {
 484                 /* Try to turn off the immutable bits. */
 485                 if (to_sb.st_flags & NOCHANGEBITS)
 486                         chflags(to_name, to_sb.st_flags & ~NOCHANGEBITS);
 487                 if (dobackup) {
 488                         if ((size_t)snprintf(backup, MAXPATHLEN, "%s%s", to_name,
 489                             suffix) != strlen(to_name) + strlen(suffix)) {
 490                                 unlink(tempfile);
 491                                 errx(EX_OSERR, "%s: backup filename too long",
 492                                     to_name);
 493                         }
 494                         if (verbose)
 495                                 printf("install: %s -> %s\n", to_name, backup);
 496                         if (rename(to_name, backup) < 0) {
 497                                 serrno = errno;
 498                                 unlink(tempfile);
 499                                 errno = serrno;
 500                                 err(EX_OSERR, "rename: %s to %s", to_name,
 501                                      backup);
 502                         }
 503                 }
 504                 if (verbose)
 505                         printf("install: %s -> %s\n", from_name, to_name);
 506                 if (rename(tempfile, to_name) < 0) {
 507                         serrno = errno;
 508                         unlink(tempfile);
 509                         errno = serrno;
 510                         err(EX_OSERR, "rename: %s to %s",
 511                             tempfile, to_name);
 512                 }
 513
 514                 /* Re-open to_fd so we aren't hosed by the rename(2). */
 515                 close(to_fd);
 516                 if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
 517                         err(EX_OSERR, "%s", to_name);
 518         }
 519
 520         /*
 521          * Preserve the timestamp of the source file if necessary.
 522          */
 523         if (dopreserve && !files_match && !devnull) {
 524                 utb.actime = from_sb.st_atime;
 525                 utb.modtime = from_sb.st_mtime;
 526                 utime(to_name, &utb);
 527         }
 528
 529         if (fstat(to_fd, &to_sb) == -1) {
 530                 serrno = errno;
 531                 unlink(to_name);
 532                 errno = serrno;
 533                 err(EX_OSERR, "%s", to_name);
 534         }
 535
 536         /*
 537          * Set owner, group, mode for target; do the chown first,
 538          * chown may lose the setuid bits.
 539          */
 540         if ((gid != (gid_t)-1 && gid != to_sb.st_gid) ||
 541             (uid != (uid_t)-1 && uid != to_sb.st_uid) ||
 542             (mode != to_sb.st_mode)) {
 543                 /* Try to turn off the immutable bits. */
 544                 if (to_sb.st_flags & NOCHANGEBITS)
 545                         fchflags(to_fd, to_sb.st_flags & ~NOCHANGEBITS);
 546         }
 547
 548         if ((gid != (gid_t)-1 && gid != to_sb.st_gid) ||
 549             (uid != (uid_t)-1 && uid != to_sb.st_uid))
 550                 if (fchown(to_fd, uid, gid) == -1) {
 551                         serrno = errno;
 552                         unlink(to_name);
 553                         errno = serrno;
 554                         err(EX_OSERR,"%s: chown/chgrp", to_name);
 555                 }
 556
 557         if (mode != to_sb.st_mode)
 558                 if (fchmod(to_fd, mode)) {
 559                         serrno = errno;
 560                         unlink(to_name);
 561                         errno = serrno;
 562                         err(EX_OSERR, "%s: chmod", to_name);
 563                 }
 564
 565         /*
 566          * If provided a set of flags, set them, otherwise, preserve the
 567          * flags, except for the dump and history flags.  The dump flag
 568          * is left clear on the target while the history flag from when
 569          * the target was created (which is inherited from the target's
 570          * parent directory) is retained.
 571          */
 572         if (flags & SETFLAGS) {
 573                 nfset = (to_sb.st_flags | fset) & ~fclr;
 574         } else {
 575                 nfset = from_sb.st_flags & ~(UF_NODUMP | UF_NOHISTORY) |
 576                         (to_sb.st_flags & UF_NOHISTORY);
 577         }
 578
 579         /*
 580          * NFS does not support flags.  Ignore EOPNOTSUPP flags if we're just
 581          * trying to turn off UF_NODUMP.  If we're trying to set real flags,
 582          * then warn if the the fs doesn't support it, otherwise fail.
 583          */
 584         if (!devnull && fchflags(to_fd, nfset)) {
 585                 if (flags & SETFLAGS) {
 586                         if (errno == EOPNOTSUPP)
 587                                 warn("%s: chflags", to_name);
 588                         else {
 589                                 serrno = errno;
 590                                 unlink(to_name);
 591                                 errno = serrno;
 592                                 err(EX_OSERR, "%s: chflags", to_name);
 593                         }
 594                 }
 595         }
 596
 597         close(to_fd);
 598         if (!devnull)
 599                 close(from_fd);
 600 }
 601
 602 /*
 603  * compare --
 604  *      compare two files; non-zero means files differ
 605  */
 606 int
 607 compare(int from_fd, const char *from_name __unused, size_t from_len,
 608         int to_fd, const char *to_name __unused, size_t to_len)
 609 {
 610         char *p, *q;
 611         int rv;
 612         int done_compare;
 613
 614         rv = 0;
 615         if (from_len != to_len)
 616                 return 1;
 617
 618         if (from_len <= MAX_CMP_SIZE) {
 619                 done_compare = 0;
 620                 if (trymmap(from_fd) && trymmap(to_fd)) {
 621                         p = mmap(NULL, from_len, PROT_READ, MAP_SHARED, from_fd, (off_t)0);
 622                         if (p == (char *)MAP_FAILED)
 623                                 goto out;
 624                         q = mmap(NULL, from_len, PROT_READ, MAP_SHARED, to_fd, (off_t)0);
 625                         if (q == (char *)MAP_FAILED) {
 626                                 munmap(p, from_len);
 627                                 goto out;
 628                         }
 629
 630                         rv = memcmp(p, q, from_len);
 631                         munmap(p, from_len);
 632                         munmap(q, from_len);
 633                         done_compare = 1;
 634                 }
 635         out:
 636                 if (!done_compare) {
 637                         char buf1[MAXBSIZE];
 638                         char buf2[MAXBSIZE];
 639                         int n1, n2;
 640
 641                         rv = 0;
 642                         lseek(from_fd, 0, SEEK_SET);
 643                         lseek(to_fd, 0, SEEK_SET);
 644                         while (rv == 0) {
 645                                 n1 = read(from_fd, buf1, sizeof(buf1));
 646                                 if (n1 == 0)
 647                                         break;          /* EOF */
 648                                 else if (n1 > 0) {
 649                                         n2 = read(to_fd, buf2, n1);
 650                                         if (n2 == n1)
 651                                                 rv = memcmp(buf1, buf2, n1);
 652                                         else
 653                                                 rv = 1; /* out of sync */
 654                                 } else
 655                                         rv = 1;         /* read failure */
 656                         }
 657                         lseek(from_fd, 0, SEEK_SET);
 658                         lseek(to_fd, 0, SEEK_SET);
 659                 }
 660         } else
 661                 rv = 1; /* don't bother in this case */
 662
 663         return rv;
 664 }
 665
 666 /*
 667  * create_tempfile --
 668  *      create a temporary file based on path and open it
 669  */
 670 int
 671 create_tempfile(const char *path, char *temp, size_t tsize)
 672 {
 673         char *p;
 674
 675         strncpy(temp, path, tsize);
 676         temp[tsize - 1] = '\0';
 677         if ((p = strrchr(temp, '/')) != NULL)
 678                 p++;
 679         else
 680                 p = temp;
 681         strncpy(p, "INS@XXXX", &temp[tsize - 1] - p);
 682         temp[tsize - 1] = '\0';
 683         return (mkstemp(temp));
 684 }
 685
 686 /*
 687  * create_newfile --
 688  *      create a new file, overwriting an existing one if necessary
 689  */
 690 int
 691 create_newfile(const char *path, int target, struct stat *sbp)
 692 {
 693         char backup[MAXPATHLEN];
 694
 695         if (target) {
 696                 /*
 697                  * Unlink now... avoid ETXTBSY errors later.  Try to turn
 698                  * off the append/immutable bits -- if we fail, go ahead,
 699                  * it might work.
 700                  */
 701                 if (sbp->st_flags & NOCHANGEBITS)
 702                         chflags(path, sbp->st_flags & ~NOCHANGEBITS);
 703
 704                 if (dobackup) {
 705                         if ((size_t)snprintf(backup, MAXPATHLEN, "%s%s",
 706                             path, suffix) != strlen(path) + strlen(suffix))
 707                                 errx(EX_OSERR, "%s: backup filename too long",
 708                                     path);
 709                         snprintf(backup, MAXPATHLEN, "%s%s",
 710                             path, suffix);
 711                         if (verbose)
 712                                 printf("install: %s -> %s\n",
 713                                     path, backup);
 714                         if (rename(path, backup) < 0)
 715                                 err(EX_OSERR, "rename: %s to %s", path, backup);
 716                 } else
 717                         unlink(path);
 718         }
 719
 720         return (open(path, O_CREAT | O_RDWR | O_TRUNC, S_IRUSR | S_IWUSR));
 721 }
 722
 723 /*
 724  * copy --
 725  *      copy from one file to another
 726  */
 727 void
 728 copy(int from_fd, const char *from_name, int to_fd,
 729      const char *to_name, off_t size)
 730 {
 731         int nr, nw;
 732         int serrno;
 733         char *p, buf[MAXBSIZE];
 734         int done_copy;
 735
 736         /* Rewind file descriptors. */
 737         if (lseek(from_fd, (off_t)0, SEEK_SET) == (off_t)-1)
 738                 err(EX_OSERR, "lseek: %s", from_name);
 739         if (lseek(to_fd, (off_t)0, SEEK_SET) == (off_t)-1)
 740                 err(EX_OSERR, "lseek: %s", to_name);
 741
 742         /*
 743          * Mmap and write if less than 8M (the limit is so we don't totally
 744          * trash memory on big files.  This is really a minor hack, but it
 745          * wins some CPU back.
 746          */
 747         done_copy = 0;
 748         if (size <= 8 * 1048576 && trymmap(from_fd) &&
 749             (p = mmap(NULL, (size_t)size, PROT_READ, MAP_SHARED,
 750                     from_fd, (off_t)0)) != (char *)MAP_FAILED) {
 751                 if ((nw = write(to_fd, p, size)) != size) {
 752                         serrno = errno;
 753                         unlink(to_name);
 754                         errno = nw > 0 ? EIO : serrno;
 755                         err(EX_OSERR, "%s", to_name);
 756                 }
 757                 done_copy = 1;
 758         }
 759         if (!done_copy) {
 760                 while ((nr = read(from_fd, buf, sizeof(buf))) > 0)
 761                         if ((nw = write(to_fd, buf, nr)) != nr) {
 762                                 serrno = errno;
 763                                 unlink(to_name);
 764                                 errno = nw > 0 ? EIO : serrno;
 765                                 err(EX_OSERR, "%s", to_name);
 766                         }
 767                 if (nr != 0) {
 768                         serrno = errno;
 769                         unlink(to_name);
 770                         errno = serrno;
 771                         err(EX_OSERR, "%s", from_name);
 772                 }
 773         }
 774 }
 775
 776 /*
 777  * strip --
 778  *      use strip(1) to strip the target file
 779  */
 780 void
 781 strip(const char *to_name)
 782 {
 783         const char *stripbin;
 784         int serrno, status;
 785
 786         switch (fork()) {
 787         case -1:
 788                 serrno = errno;
 789                 unlink(to_name);
 790                 errno = serrno;
 791                 err(EX_TEMPFAIL, "fork");
 792         case 0:
 793                 stripbin = getenv("STRIPBIN");
 794                 if (stripbin == NULL)
 795                         stripbin = "strip";
 796                 execlp(stripbin, stripbin, to_name, (char *)NULL);
 797                 err(EX_OSERR, "exec(%s)", stripbin);
 798         default:
 799                 if (wait(&status) == -1 || status) {
 800                         serrno = errno;
 801                         unlink(to_name);
 802                         errc(EX_SOFTWARE, serrno, "wait");
 803                         /* NOTREACHED */
 804                 }
 805         }
 806 }
 807
 808 /*
 809  * install_dir --
 810  *      build directory hierarchy
 811  */
 812 void
 813 install_dir(char *path)
 814 {
 815         char *p;
 816         struct stat sb;
 817         int ch;
 818
 819         for (p = path;; ++p)
 820                 if (!*p || (p != path && *p  == '/')) {
 821                         ch = *p;
 822                         *p = '\0';
 823                         if (stat(path, &sb)) {
 824                                 if (errno != ENOENT || mkdir(path, 0755) < 0) {
 825                                         err(EX_OSERR, "mkdir %s", path);
 826                                         /* NOTREACHED */
 827                                 } else if (verbose)
 828                                         printf("install: mkdir %s\n",
 829                                                      path);
 830                         } else if (!S_ISDIR(sb.st_mode))
 831                                 errx(EX_OSERR, "%s exists but is not a directory", path);
 832                         if (!(*p = ch))
 833                                 break;
 834                 }
 835
 836         if ((gid != (gid_t)-1 || uid != (uid_t)-1) && chown(path, uid, gid))
 837                 warn("chown %u:%u %s", uid, gid, path);
 838         if (chmod(path, mode))
 839                 warn("chmod %o %s", mode, path);
 840 }
 841
 842 /*
 843  * usage --
 844  *      print a usage message and die
 845  */
 846 void
 847 usage(void)
 848 {
 849         fprintf(stderr, "\
 850 usage: install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]\n\
 851                [-o owner] file1 file2\n\
 852        install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]\n\
 853                [-o owner] file1 ... fileN directory\n\
 854        install -d [-v] [-g group] [-m mode] [-o owner] directory ...\n");
 855         exit(EX_USAGE);
 856         /* NOTREACHED */
 857 }
 858
 859 /*
 860  * trymmap --
 861  *      return true (1) if mmap should be tried, false (0) if not.
 862  */
 863 int
 864 trymmap(int fd)
 865 {
 866 /*
 867  * The ifdef is for bootstrapping - f_fstypename doesn't exist in
 868  * pre-Lite2-merge systems.
 869  */
 870 #ifdef MFSNAMELEN
 871         struct statfs stfs;
 872
 873         if (nommap || fstatfs(fd, &stfs) != 0)
 874                 return (0);
 875         if (strcmp(stfs.f_fstypename, "ufs") == 0 ||
 876             strcmp(stfs.f_fstypename, "cd9660") == 0)
 877                 return (1);
 878 #endif
 879         return (0);
 880 }