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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1987, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)xinstall.c       8.1 (Berkeley) 7/21/93
  31  * $FreeBSD: src/usr.bin/xinstall/xinstall.c,v 1.38.2.8 2002/08/07 16:29:48 ru Exp $
  32  */
  33
  34 #include <sys/param.h>
  35 #include <sys/mman.h>
  36 #include <sys/mount.h>
  37 #include <sys/stat.h>
  38 #include <sys/wait.h>
  39
  40 #include <ctype.h>
  41 #include <err.h>
  42 #include <errno.h>
  43 #include <fcntl.h>
  44 #include <grp.h>
  45 #include <paths.h>
  46 #include <pwd.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <sysexits.h>
  51 #include <unistd.h>
  52 #include <utime.h>
  53
  54 /* Bootstrap aid - this doesn't exist in most older releases */
  55 #ifndef MAP_FAILED
  56 #define MAP_FAILED ((void *)-1) /* from <sys/mman.h> */
  57 #endif
  58 #ifndef UF_NOHISTORY
  59 #define UF_NOHISTORY    0
  60 #endif
  61
  62 #define MAX_CMP_SIZE    (16 * 1024 * 1024)
  63
  64 #define DIRECTORY       0x01            /* Tell install it's a directory. */
  65 #define SETFLAGS        0x02            /* Tell install to set flags. */
  66 #define NOCHANGEBITS    (UF_IMMUTABLE | UF_APPEND | SF_IMMUTABLE | SF_APPEND)
  67 #define BACKUP_SUFFIX   ".old"
  68
  69 static struct passwd *pp;
  70 static struct group *gp;
  71 static gid_t gid;
  72 static uid_t uid;
  73 static int dobackup, docompare, dodir, dopreserve, dostrip, dounpriv, nommap,
  74     safecopy, verbose;
  75 static mode_t mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
  76 static const char *suffix = BACKUP_SUFFIX;
  77 static char *destdir, *fflags;
  78
  79 static int file_getgroup(const char *etcdir, const char *group, gid_t *gidret);
  80 static int file_getowner(const char *etcdir, const char *owner, uid_t *uidret);
  81
  82 static int      compare(int, const char *, size_t, int, const char *, size_t);
  83 static void     copy(int, const char *, int, const char *, off_t);
  84 static int      create_newfile(const char *, int, struct stat *);
  85 static int      create_tempfile(const char *, char *, size_t);
  86 static void     install(const char *, const char *, u_long, u_long, u_int);
  87 static void     install_dir(char *);
  88 u_long  numeric_id(const char *, const char *);
  89 static void     strip(const char *);
  90 static int      trymmap(int);
  91 static void     usage(void);
  92
  93 int
  94 main(int argc, char *argv[])
  95 {
  96         struct stat from_sb, to_sb;
  97         mode_t *set;
  98         u_long fset;
  99         u_long fclr;
 100         int ch, no_target;
 101         int trysys;
 102         u_int iflags;
 103         const char *group, *owner, *to_name;
 104         const char *etcdir;
 105
 106         iflags = 0;
 107         trysys = 0;
 108         group = NULL;
 109         owner = NULL;
 110         etcdir = NULL;
 111
 112         while ((ch = getopt(argc, argv, "L:B:bCcD:df:g:lMm:o:pSsUv")) != -1)
 113                 switch((char)ch) {
 114                 case 'B':
 115                         suffix = optarg;
 116                         /* FALLTHROUGH */
 117                 case 'b':
 118                         dobackup = 1;
 119                         break;
 120                 case 'C':
 121                         docompare = 1;
 122                         break;
 123                 case 'c':
 124                         /* For backwards compatibility. */
 125                         break;
 126                 case 'D':
 127                         destdir = optarg;
 128                         break;
 129                 case 'd':
 130                         dodir = 1;
 131                         break;
 132                 case 'f':
 133                         fflags = optarg;
 134                         break;
 135                 case 'g':
 136                         group = optarg;
 137                         break;
 138                 case 'L':
 139                         etcdir = optarg;
 140                         break;
 141                 case 'l':
 142                         trysys = 1;
 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 'U':
 167                         dounpriv = 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                 warnx("-d and -s may not be specified together");
 182                 usage();
 183         }
 184
 185         if (getenv("DONTSTRIP") != NULL) {
 186                 warnx("DONTSTRIP set - will not strip installed binaries");
 187                 dostrip = 0;
 188         }
 189
 190         /* must have at least two arguments, except when creating directories */
 191         if (argc < 2 && !dodir)
 192                 usage();
 193
 194         /* need to make a temp copy so we can compare stripped version */
 195         if (docompare && dostrip)
 196                 safecopy = 1;
 197
 198         /* no etcdir specified, always try the system */
 199         if (etcdir == NULL)
 200                 trysys = 1;
 201         uid = (uid_t)-1;
 202         gid = (gid_t)-1;
 203
 204         /* get group and owner id's */
 205         if (group != NULL && !dounpriv) {
 206                 if (etcdir && file_getgroup(etcdir, group, &gid)) {
 207                         ;
 208                 } else if (trysys && (gp = getgrnam(group)) != NULL) {
 209                         gid = gp->gr_gid;
 210                 } else {
 211                         gid = (gid_t)numeric_id(group, "group");
 212                 }
 213         }
 214
 215         if (owner != NULL && !dounpriv) {
 216                 if (etcdir && file_getowner(etcdir, owner, &uid)) {
 217                         ;
 218                 } else if (trysys && (pp = getpwnam(owner)) != NULL) {
 219                         uid = pp->pw_uid;
 220                 } else {
 221                         uid = (uid_t)numeric_id(owner, "user");
 222                 }
 223         }
 224
 225         if (fflags != NULL && !dounpriv) {
 226                 if (strtofflags(&fflags, &fset, &fclr))
 227                         errx(EX_USAGE, "%s: invalid flag", fflags);
 228                 iflags |= SETFLAGS;
 229         }
 230
 231         if (dodir) {
 232                 for (; *argv != NULL; ++argv)
 233                         install_dir(*argv);
 234                 exit(EX_OK);
 235                 /* NOTREACHED */
 236         }
 237
 238         to_name = argv[argc - 1];
 239         no_target = stat(to_name, &to_sb);
 240         if (!no_target && S_ISDIR(to_sb.st_mode)) {
 241                 for (; *argv != to_name; ++argv)
 242                         install(*argv, to_name, fset, fclr, iflags | DIRECTORY);
 243                 exit(EX_OK);
 244                 /* NOTREACHED */
 245         }
 246
 247         /* can't do file1 file2 directory/file */
 248         if (argc != 2) {
 249                 if (no_target)
 250                         warnx("target directory `%s' does not exist",
 251                             argv[argc - 1]);
 252                 else
 253                         warnx("target `%s' is not a directory",
 254                             argv[argc - 1]);
 255                 usage();
 256         }
 257
 258         if (!no_target) {
 259                 if (stat(*argv, &from_sb))
 260                         err(EX_OSERR, "%s", *argv);
 261                 if (!S_ISREG(to_sb.st_mode)) {
 262                         errno = EFTYPE;
 263                         err(EX_OSERR, "%s", to_name);
 264                 }
 265                 if (to_sb.st_dev == from_sb.st_dev &&
 266                     to_sb.st_ino == from_sb.st_ino)
 267                         errx(EX_USAGE,
 268                             "%s and %s are the same file", *argv, to_name);
 269         }
 270         install(*argv, to_name, fset, fclr, iflags);
 271         exit(EX_OK);
 272         /* NOTREACHED */
 273 }
 274
 275 u_long
 276 numeric_id(const char *name, const char *type)
 277 {
 278         u_long val;
 279         char *ep;
 280
 281         /*
 282          * XXX
 283          * We know that uid_t's and gid_t's are unsigned longs.
 284          */
 285         errno = 0;
 286         val = strtoul(name, &ep, 10);
 287         if (errno)
 288                 err(EX_NOUSER, "%s", name);
 289         if (*ep != '\0')
 290                 errx(EX_NOUSER, "unknown %s %s", type, name);
 291         return (val);
 292 }
 293
 294 static
 295 int
 296 file_getgroup(const char *etcdir, const char *group, gid_t *gidret)
 297 {
 298         FILE *fp;
 299         size_t len;
 300         size_t grlen;
 301         char *path;
 302         char *ptr;
 303         char *scan;
 304
 305         grlen = strlen(group);
 306
 307         if (asprintf(&path, "%s/group", etcdir) < 0)
 308                 errx(EX_OSERR, "asprintf()");
 309         if ((fp = fopen(path, "r")) != NULL) {
 310                 while ((ptr = fgetln(fp, &len)) != NULL && len) {
 311                         ptr[len - 1] = 0;
 312                         if ((scan = strchr(ptr, ':')) == NULL)
 313                                 continue;
 314                         if ((size_t)(scan - ptr) != grlen)
 315                                 continue;
 316                         if (strncmp(ptr, group, grlen) != 0)
 317                                 continue;
 318                         if ((scan = strchr(scan + 1, ':')) == NULL)
 319                                 continue;
 320                         *gidret = strtoul(scan + 1, NULL, 10);
 321                         break;
 322                 }
 323                 fclose(fp);
 324         }
 325         free(path);
 326         return((*gidret == (gid_t)-1) ? 0 : 1);
 327 }
 328
 329 static
 330 int
 331 file_getowner(const char *etcdir, const char *owner, uid_t *uidret)
 332 {
 333         FILE *fp;
 334         size_t len;
 335         size_t owner_len;
 336         char *path;
 337         char *ptr;
 338         char *scan;
 339
 340         owner_len = strlen(owner);
 341
 342         if (asprintf(&path, "%s/master.passwd", etcdir) < 0)
 343                 errx(EX_OSERR, "asprintf()");
 344         if ((fp = fopen(path, "r")) != NULL) {
 345                 while ((ptr = fgetln(fp, &len)) != NULL && len) {
 346                         ptr[len - 1] = 0;
 347                         if ((scan = strchr(ptr, ':')) == NULL)
 348                                 continue;
 349                         if ((size_t)(scan - ptr) != owner_len)
 350                                 continue;
 351                         if (strncmp(ptr, owner, owner_len) != 0)
 352                                 continue;
 353                         if ((scan = strchr(scan + 1, ':')) == NULL)
 354                                 continue;
 355                         *uidret = strtoul(scan + 1, NULL, 10);
 356                         break;
 357                 }
 358                 fclose(fp);
 359         }
 360         free(path);
 361         return((*uidret == (uid_t)-1) ? 0 : 1);
 362 }
 363
 364 /*
 365  * install --
 366  *      build a path name and install the file
 367  */
 368 static void
 369 install(const char *from_name, const char *to_name, u_long fset, u_long fclr,
 370         u_int flags)
 371 {
 372         struct stat from_sb, temp_sb, to_sb;
 373         struct utimbuf utb;
 374         int devnull, files_match, from_fd, serrno, target;
 375         int tempcopy, temp_fd, to_fd;
 376         u_long nfset;
 377         char backup[MAXPATHLEN], *p, pathbuf[MAXPATHLEN], tempfile[MAXPATHLEN];
 378
 379         files_match = 0;
 380         from_fd = -1;
 381
 382         /* If try to install NULL file to a directory, fails. */
 383         if (flags & DIRECTORY || strcmp(from_name, _PATH_DEVNULL)) {
 384                 if (stat(from_name, &from_sb))
 385                         err(EX_OSERR, "%s", from_name);
 386                 if (!S_ISREG(from_sb.st_mode)) {
 387                         errno = EFTYPE;
 388                         err(EX_OSERR, "%s", from_name);
 389                 }
 390                 /* Build the target path. */
 391                 if (flags & DIRECTORY) {
 392                         (void)snprintf(pathbuf, sizeof(pathbuf), "%s/%s",
 393                             to_name,
 394                             (p = strrchr(from_name, '/')) ? ++p : from_name);
 395                         to_name = pathbuf;
 396                 }
 397                 devnull = 0;
 398         } else {
 399                 devnull = 1;
 400         }
 401
 402         target = stat(to_name, &to_sb) == 0;
 403
 404         /* Only install to regular files. */
 405         if (target && !S_ISREG(to_sb.st_mode)) {
 406                 errno = EFTYPE;
 407                 warn("%s", to_name);
 408                 return;
 409         }
 410
 411         /* Only copy safe if the target exists. */
 412         tempcopy = safecopy && target;
 413
 414         if (!devnull && (from_fd = open(from_name, O_RDONLY, 0)) < 0)
 415                 err(EX_OSERR, "%s", from_name);
 416
 417         /* If we don't strip, we can compare first. */
 418         if (docompare && !dostrip && target) {
 419                 if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
 420                         err(EX_OSERR, "%s", to_name);
 421                 if (devnull)
 422                         files_match = to_sb.st_size == 0;
 423                 else
 424                         files_match = !(compare(from_fd, from_name,
 425                             (size_t)from_sb.st_size, to_fd,
 426                             to_name, (size_t)to_sb.st_size));
 427
 428                 /* Close "to" file unless we match. */
 429                 if (!files_match)
 430                         (void)close(to_fd);
 431         }
 432
 433         if (!files_match) {
 434                 if (tempcopy) {
 435                         to_fd = create_tempfile(to_name, tempfile,
 436                             sizeof(tempfile));
 437                         if (to_fd < 0)
 438                                 err(EX_OSERR, "%s", tempfile);
 439                 } else {
 440                         if ((to_fd = create_newfile(to_name, target,
 441                             &to_sb)) < 0)
 442                                 err(EX_OSERR, "%s", to_name);
 443                         if (verbose)
 444                                 (void)printf("install: %s -> %s\n",
 445                                     from_name, to_name);
 446                 }
 447                 if (!devnull)
 448                         copy(from_fd, from_name, to_fd,
 449                              tempcopy ? tempfile : to_name, from_sb.st_size);
 450         }
 451
 452         if (dostrip) {
 453                 strip(tempcopy ? tempfile : to_name);
 454
 455                 /*
 456                  * Re-open our fd on the target, in case we used a strip
 457                  * that does not work in-place -- like GNU binutils strip.
 458                  */
 459                 close(to_fd);
 460                 to_fd = open(tempcopy ? tempfile : to_name, O_RDONLY, 0);
 461                 if (to_fd < 0)
 462                         err(EX_OSERR, "stripping %s", to_name);
 463         }
 464
 465         /*
 466          * Compare the stripped temp file with the target.
 467          */
 468         if (docompare && dostrip && target) {
 469                 temp_fd = to_fd;
 470
 471                 /* Re-open to_fd using the real target name. */
 472                 if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
 473                         err(EX_OSERR, "%s", to_name);
 474
 475                 if (fstat(temp_fd, &temp_sb)) {
 476                         serrno = errno;
 477                         (void)unlink(tempfile);
 478                         errno = serrno;
 479                         err(EX_OSERR, "%s", tempfile);
 480                 }
 481
 482                 if (compare(temp_fd, tempfile, (size_t)temp_sb.st_size, to_fd,
 483                             to_name, (size_t)to_sb.st_size) == 0) {
 484                         /*
 485                          * If target has more than one link we need to
 486                          * replace it in order to snap the extra links.
 487                          * Need to preserve target file times, though.
 488                          */
 489                         if (to_sb.st_nlink != 1) {
 490                                 utb.actime = to_sb.st_atime;
 491                                 utb.modtime = to_sb.st_mtime;
 492                                 utime(tempfile, &utb);
 493                         } else {
 494                                 files_match = 1;
 495                                 (void)unlink(tempfile);
 496                         }
 497                         (void) close(temp_fd);
 498                 }
 499         }
 500
 501         /*
 502          * Move the new file into place if doing a safe copy
 503          * and the files are different (or just not compared).
 504          */
 505         if (tempcopy && !files_match) {
 506                 /* Try to turn off the immutable bits. */
 507                 if (to_sb.st_flags & NOCHANGEBITS)
 508                         (void)chflags(to_name, to_sb.st_flags & ~NOCHANGEBITS);
 509                 if (dobackup) {
 510                         if ((size_t)snprintf(backup, MAXPATHLEN, "%s%s", to_name,
 511                             suffix) != strlen(to_name) + strlen(suffix)) {
 512                                 unlink(tempfile);
 513                                 errx(EX_OSERR, "%s: backup filename too long",
 514                                     to_name);
 515                         }
 516                         if (verbose)
 517                                 (void)printf("install: %s -> %s\n", to_name, backup);
 518                         if (rename(to_name, backup) < 0) {
 519                                 serrno = errno;
 520                                 unlink(tempfile);
 521                                 errno = serrno;
 522                                 err(EX_OSERR, "rename: %s to %s", to_name,
 523                                      backup);
 524                         }
 525                 }
 526                 if (verbose)
 527                         (void)printf("install: %s -> %s\n", from_name, to_name);
 528                 if (rename(tempfile, to_name) < 0) {
 529                         serrno = errno;
 530                         unlink(tempfile);
 531                         errno = serrno;
 532                         err(EX_OSERR, "rename: %s to %s",
 533                             tempfile, to_name);
 534                 }
 535
 536                 /* Re-open to_fd so we aren't hosed by the rename(2). */
 537                 (void) close(to_fd);
 538                 if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
 539                         err(EX_OSERR, "%s", to_name);
 540         }
 541
 542         /*
 543          * Preserve the timestamp of the source file if necessary.
 544          */
 545         if (dopreserve && !files_match && !devnull) {
 546                 utb.actime = from_sb.st_atime;
 547                 utb.modtime = from_sb.st_mtime;
 548                 utime(to_name, &utb);
 549         }
 550
 551         if (fstat(to_fd, &to_sb) == -1) {
 552                 serrno = errno;
 553                 (void)unlink(to_name);
 554                 errno = serrno;
 555                 err(EX_OSERR, "%s", to_name);
 556         }
 557
 558         /*
 559          * Set owner, group, mode for target; do the chown first,
 560          * chown may lose the setuid bits.
 561          */
 562         if (!dounpriv && ((gid != (gid_t)-1 && gid != to_sb.st_gid) ||
 563             (uid != (uid_t)-1 && uid != to_sb.st_uid) ||
 564             (mode != to_sb.st_mode))) {
 565                 /* Try to turn off the immutable bits. */
 566                 if (to_sb.st_flags & NOCHANGEBITS)
 567                         (void)fchflags(to_fd, to_sb.st_flags & ~NOCHANGEBITS);
 568         }
 569
 570         if (!dounpriv && (
 571             (gid != (gid_t)-1 && gid != to_sb.st_gid) ||
 572             (uid != (uid_t)-1 && uid != to_sb.st_uid)))
 573                 if (fchown(to_fd, uid, gid) == -1) {
 574                         serrno = errno;
 575                         (void)unlink(to_name);
 576                         errno = serrno;
 577                         err(EX_OSERR,"%s: chown/chgrp", to_name);
 578                 }
 579
 580         if (mode != to_sb.st_mode) {
 581                 if (fchmod(to_fd,
 582                      dounpriv ? mode & (S_IRWXU|S_IRWXG|S_IRWXO) : mode)) {
 583                         serrno = errno;
 584                         (void)unlink(to_name);
 585                         errno = serrno;
 586                         err(EX_OSERR, "%s: chmod", to_name);
 587                 }
 588         }
 589
 590         /*
 591          * If provided a set of flags, set them, otherwise, preserve the
 592          * flags, except for the dump and history flags.  The dump flag
 593          * is left clear on the target while the history flag from when
 594          * the target was created (which is inherited from the target's
 595          * parent directory) is retained.
 596          */
 597         if (flags & SETFLAGS) {
 598                 nfset = (to_sb.st_flags | fset) & ~fclr;
 599         } else {
 600                 nfset = (from_sb.st_flags & ~(UF_NODUMP | UF_NOHISTORY)) |
 601                         (to_sb.st_flags & UF_NOHISTORY);
 602         }
 603
 604         /*
 605          * NFS does not support flags.  Ignore EOPNOTSUPP flags if we're just
 606          * trying to turn off UF_NODUMP.  If we're trying to set real flags,
 607          * then warn if the fs doesn't support it, otherwise fail.
 608          */
 609         if (!dounpriv && !devnull && fchflags(to_fd, nfset)) {
 610                 if (flags & SETFLAGS) {
 611                         if (errno == EOPNOTSUPP)
 612                                 warn("%s: chflags", to_name);
 613                         else {
 614                                 serrno = errno;
 615                                 (void)unlink(to_name);
 616                                 errno = serrno;
 617                                 err(EX_OSERR, "%s: chflags", to_name);
 618                         }
 619                 }
 620         }
 621
 622         (void)close(to_fd);
 623         if (!devnull)
 624                 (void)close(from_fd);
 625 }
 626
 627 /*
 628  * compare --
 629  *      compare two files; non-zero means files differ
 630  */
 631 static int
 632 compare(int from_fd, const char *from_name __unused, size_t from_len,
 633         int to_fd, const char *to_name __unused, size_t to_len)
 634 {
 635         char *p, *q;
 636         int rv;
 637         int done_compare;
 638
 639         rv = 0;
 640         if (from_len != to_len)
 641                 return 1;
 642
 643         if (from_len <= MAX_CMP_SIZE) {
 644                 done_compare = 0;
 645                 if (trymmap(from_fd) && trymmap(to_fd)) {
 646                         p = mmap(NULL, from_len, PROT_READ, MAP_SHARED, from_fd, (off_t)0);
 647                         if (p == (char *)MAP_FAILED)
 648                                 goto out;
 649                         q = mmap(NULL, from_len, PROT_READ, MAP_SHARED, to_fd, (off_t)0);
 650                         if (q == (char *)MAP_FAILED) {
 651                                 munmap(p, from_len);
 652                                 goto out;
 653                         }
 654
 655                         rv = memcmp(p, q, from_len);
 656                         munmap(p, from_len);
 657                         munmap(q, from_len);
 658                         done_compare = 1;
 659                 }
 660         out:
 661                 if (!done_compare) {
 662                         char buf1[MAXBSIZE];
 663                         char buf2[MAXBSIZE];
 664                         int n1, n2;
 665
 666                         rv = 0;
 667                         lseek(from_fd, 0, SEEK_SET);
 668                         lseek(to_fd, 0, SEEK_SET);
 669                         while (rv == 0) {
 670                                 n1 = read(from_fd, buf1, sizeof(buf1));
 671                                 if (n1 == 0)
 672                                         break;          /* EOF */
 673                                 else if (n1 > 0) {
 674                                         n2 = read(to_fd, buf2, n1);
 675                                         if (n2 == n1)
 676                                                 rv = memcmp(buf1, buf2, n1);
 677                                         else
 678                                                 rv = 1; /* out of sync */
 679                                 } else
 680                                         rv = 1;         /* read failure */
 681                         }
 682                         lseek(from_fd, 0, SEEK_SET);
 683                         lseek(to_fd, 0, SEEK_SET);
 684                 }
 685         } else
 686                 rv = 1; /* don't bother in this case */
 687
 688         return rv;
 689 }
 690
 691 /*
 692  * create_tempfile --
 693  *      create a temporary file based on path and open it
 694  */
 695 static int
 696 create_tempfile(const char *path, char *temp, size_t tsize)
 697 {
 698         char *p;
 699
 700         (void)strncpy(temp, path, tsize);
 701         temp[tsize - 1] = '\0';
 702         if ((p = strrchr(temp, '/')) != NULL)
 703                 p++;
 704         else
 705                 p = temp;
 706         (void)strncpy(p, "INS@XXXX", &temp[tsize - 1] - p);
 707         temp[tsize - 1] = '\0';
 708         return (mkstemp(temp));
 709 }
 710
 711 /*
 712  * create_newfile --
 713  *      create a new file, overwriting an existing one if necessary
 714  */
 715 static int
 716 create_newfile(const char *path, int target, struct stat *sbp)
 717 {
 718         char backup[MAXPATHLEN];
 719
 720         if (target) {
 721                 /*
 722                  * Unlink now... avoid ETXTBSY errors later.  Try to turn
 723                  * off the append/immutable bits -- if we fail, go ahead,
 724                  * it might work.
 725                  */
 726                 if (sbp->st_flags & NOCHANGEBITS)
 727                         (void)chflags(path, sbp->st_flags & ~NOCHANGEBITS);
 728
 729                 if (dobackup) {
 730                         if ((size_t)snprintf(backup, MAXPATHLEN, "%s%s",
 731                             path, suffix) != strlen(path) + strlen(suffix))
 732                                 errx(EX_OSERR, "%s: backup filename too long",
 733                                     path);
 734                         (void)snprintf(backup, MAXPATHLEN, "%s%s",
 735                             path, suffix);
 736                         if (verbose)
 737                                 (void)printf("install: %s -> %s\n",
 738                                     path, backup);
 739                         if (rename(path, backup) < 0)
 740                                 err(EX_OSERR, "rename: %s to %s", path, backup);
 741                 } else
 742                         unlink(path);
 743         }
 744
 745         return (open(path, O_CREAT | O_RDWR | O_TRUNC, S_IRUSR | S_IWUSR));
 746 }
 747
 748 /*
 749  * copy --
 750  *      copy from one file to another
 751  */
 752 static void
 753 copy(int from_fd, const char *from_name, int to_fd,
 754      const char *to_name, off_t size)
 755 {
 756         int nr, nw;
 757         int serrno;
 758         char *p;
 759         char buf[MAXBSIZE];
 760         int done_copy;
 761
 762         /* Rewind file descriptors. */
 763         if (lseek(from_fd, (off_t)0, SEEK_SET) == (off_t)-1)
 764                 err(EX_OSERR, "lseek: %s", from_name);
 765         if (lseek(to_fd, (off_t)0, SEEK_SET) == (off_t)-1)
 766                 err(EX_OSERR, "lseek: %s", to_name);
 767
 768         /*
 769          * Mmap and write if less than 8M (the limit is so we don't totally
 770          * trash memory on big files.  This is really a minor hack, but it
 771          * wins some CPU back.
 772          */
 773         done_copy = 0;
 774         if (size <= 8 * 1048576 && trymmap(from_fd) &&
 775             (p = mmap(NULL, (size_t)size, PROT_READ, MAP_SHARED,
 776                     from_fd, (off_t)0)) != (char *)MAP_FAILED) {
 777                 if ((nw = write(to_fd, p, size)) != size) {
 778                         serrno = errno;
 779                         (void)unlink(to_name);
 780                         errno = nw > 0 ? EIO : serrno;
 781                         err(EX_OSERR, "%s", to_name);
 782                 }
 783                 done_copy = 1;
 784         }
 785         if (!done_copy) {
 786                 while ((nr = read(from_fd, buf, sizeof(buf))) > 0) {
 787                         if ((nw = write(to_fd, buf, nr)) != nr) {
 788                                 serrno = errno;
 789                                 (void)unlink(to_name);
 790                                 errno = nw > 0 ? EIO : serrno;
 791                                 err(EX_OSERR, "%s", to_name);
 792                         }
 793                 }
 794                 if (nr != 0) {
 795                         serrno = errno;
 796                         (void)unlink(to_name);
 797                         errno = serrno;
 798                         err(EX_OSERR, "%s", from_name);
 799                 }
 800         }
 801 }
 802
 803 /*
 804  * strip --
 805  *      use strip(1) to strip the target file
 806  */
 807 static void
 808 strip(const char *to_name)
 809 {
 810         const char *stripbin;
 811         int serrno, status;
 812
 813         switch (fork()) {
 814         case -1:
 815                 serrno = errno;
 816                 (void)unlink(to_name);
 817                 errno = serrno;
 818                 err(EX_TEMPFAIL, "fork");
 819         case 0:
 820                 stripbin = getenv("STRIPBIN");
 821                 if (stripbin == NULL)
 822                         stripbin = "strip";
 823                 execlp(stripbin, stripbin, to_name, NULL);
 824                 err(EX_OSERR, "exec(%s)", stripbin);
 825         default:
 826                 if (wait(&status) == -1 || status) {
 827                         serrno = errno;
 828                         (void)unlink(to_name);
 829                         errc(EX_SOFTWARE, serrno, "wait");
 830                         /* NOTREACHED */
 831                 }
 832         }
 833 }
 834
 835 /*
 836  * When doing a concurrent make -j N multiple install's can race the mkdir.
 837  */
 838 static
 839 int
 840 mkdir_race(const char *path, int nmode)
 841 {
 842         int res;
 843         struct stat sb;
 844
 845         res = mkdir(path, nmode);
 846         if (res < 0 && errno == EEXIST) {
 847                 if (stat(path, &sb) == 0 && S_ISDIR(sb.st_mode))
 848                         return(0);
 849                 res = mkdir(path, nmode);
 850         }
 851         return (res);
 852 }
 853
 854 /*
 855  * install_dir --
 856  *      build directory hierarchy
 857  */
 858 static void
 859 install_dir(char *path)
 860 {
 861         char *p;
 862         struct stat sb;
 863         int ch;
 864
 865         for (p = path;; ++p)
 866                 if (!*p || (p != path && *p  == '/')) {
 867                         ch = *p;
 868                         *p = '\0';
 869                         if (stat(path, &sb)) {
 870                                 if (errno != ENOENT ||
 871                                     mkdir_race(path, 0755) < 0) {
 872                                         err(EX_OSERR, "mkdir %s", path);
 873                                         /* NOTREACHED */
 874                                 } else if (verbose)
 875                                         (void)printf("install: mkdir %s\n",
 876                                                      path);
 877                         } else if (!S_ISDIR(sb.st_mode))
 878                                 errx(EX_OSERR, "%s exists but is not a directory", path);
 879                         if (!(*p = ch))
 880                                 break;
 881                 }
 882
 883         if (!dounpriv) {
 884                 if ((gid != (gid_t)-1 || uid != (uid_t)-1) &&
 885                     chown(path, uid, gid))
 886                         warn("chown %u:%u %s", uid, gid, path);
 887                 /* XXXBED: should we do the chmod in the dounpriv case? */
 888                 if (chmod(path, mode))
 889                         warn("chmod %o %s", mode, path);
 890         }
 891 }
 892
 893 /*
 894  * usage --
 895  *      print a usage message and die
 896  */
 897 static void
 898 usage(void)
 899 {
 900         fprintf(stderr,
 901 "usage: install [-bCcpSsUv] [-B suffix] [-D dest] [-f flags] [-g group]\n"
 902 "               [-m mode] [-o owner] file1 file2\n"
 903 "       install [-bCcpSsUv] [-B suffix] [-D dest] [-f flags] [-g group]\n"
 904 "               [-m mode] [-o owner] file1 ... fileN directory\n"
 905 "       install -d [-lUv] [-D dest] [-g group] [-m mode] [-o owner]\n"
 906 "               directory ...\n");
 907         exit(EX_USAGE);
 908         /* NOTREACHED */
 909 }
 910
 911 /*
 912  * trymmap --
 913  *      return true (1) if mmap should be tried, false (0) if not.
 914  */
 915 static int
 916 trymmap(int fd)
 917 {
 918 /*
 919  * The ifdef is for bootstrapping - f_fstypename doesn't exist in
 920  * pre-Lite2-merge systems.
 921  */
 922 #ifdef MFSNAMELEN
 923         struct statfs stfs;
 924
 925         if (nommap || fstatfs(fd, &stfs) != 0)
 926                 return (0);
 927         if (strcmp(stfs.f_fstypename, "ufs") == 0 ||
 928             strcmp(stfs.f_fstypename, "cd9660") == 0)
 929                 return (1);
 930 #endif
 931         return (0);
 932 }