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         fclr = 0;
 107         fset = 0;
 108         iflags = 0;
 109         trysys = 0;
 110         group = NULL;
 111         owner = NULL;
 112         etcdir = NULL;
 113
 114         while ((ch = getopt(argc, argv, "L:B:bCcD:df:g:lMm:o:pSsUv")) != -1)
 115                 switch((char)ch) {
 116                 case 'B':
 117                         suffix = optarg;
 118                         /* FALLTHROUGH */
 119                 case 'b':
 120                         dobackup = 1;
 121                         break;
 122                 case 'C':
 123                         docompare = 1;
 124                         break;
 125                 case 'c':
 126                         /* For backwards compatibility. */
 127                         break;
 128                 case 'D':
 129                         destdir = optarg;
 130                         break;
 131                 case 'd':
 132                         dodir = 1;
 133                         break;
 134                 case 'f':
 135                         fflags = optarg;
 136                         break;
 137                 case 'g':
 138                         group = optarg;
 139                         break;
 140                 case 'L':
 141                         etcdir = optarg;
 142                         break;
 143                 case 'l':
 144                         trysys = 1;
 145                         break;
 146                 case 'M':
 147                         nommap = 1;
 148                         break;
 149                 case 'm':
 150                         if (!(set = setmode(optarg)))
 151                                 errx(EX_USAGE, "invalid file mode: %s",
 152                                      optarg);
 153                         mode = getmode(set, 0);
 154                         free(set);
 155                         break;
 156                 case 'o':
 157                         owner = optarg;
 158                         break;
 159                 case 'p':
 160                         docompare = dopreserve = 1;
 161                         break;
 162                 case 'S':
 163                         safecopy = 1;
 164                         break;
 165                 case 's':
 166                         dostrip = 1;
 167                         break;
 168                 case 'U':
 169                         dounpriv = 1;
 170                         break;
 171                 case 'v':
 172                         verbose = 1;
 173                         break;
 174                 case '?':
 175                 default:
 176                         usage();
 177                 }
 178         argc -= optind;
 179         argv += optind;
 180
 181         /* some options make no sense when creating directories */
 182         if (dostrip && dodir) {
 183                 warnx("-d and -s may not be specified together");
 184                 usage();
 185         }
 186
 187         if (getenv("DONTSTRIP") != NULL) {
 188                 warnx("DONTSTRIP set - will not strip installed binaries");
 189                 dostrip = 0;
 190         }
 191
 192         /* must have at least two arguments, except when creating directories */
 193         if (argc < 2 && !dodir)
 194                 usage();
 195
 196         /* need to make a temp copy so we can compare stripped version */
 197         if (docompare && dostrip)
 198                 safecopy = 1;
 199
 200         /* no etcdir specified, always try the system */
 201         if (etcdir == NULL)
 202                 trysys = 1;
 203         uid = (uid_t)-1;
 204         gid = (gid_t)-1;
 205
 206         /* get group and owner id's */
 207         if (group != NULL && !dounpriv) {
 208                 if (etcdir && file_getgroup(etcdir, group, &gid)) {
 209                         ;
 210                 } else if (trysys && (gp = getgrnam(group)) != NULL) {
 211                         gid = gp->gr_gid;
 212                 } else {
 213                         gid = (gid_t)numeric_id(group, "group");
 214                 }
 215         }
 216
 217         if (owner != NULL && !dounpriv) {
 218                 if (etcdir && file_getowner(etcdir, owner, &uid)) {
 219                         ;
 220                 } else if (trysys && (pp = getpwnam(owner)) != NULL) {
 221                         uid = pp->pw_uid;
 222                 } else {
 223                         uid = (uid_t)numeric_id(owner, "user");
 224                 }
 225         }
 226
 227         if (fflags != NULL && !dounpriv) {
 228                 if (strtofflags(&fflags, &fset, &fclr))
 229                         errx(EX_USAGE, "%s: invalid flag", fflags);
 230                 iflags |= SETFLAGS;
 231         }
 232
 233         if (dodir) {
 234                 for (; *argv != NULL; ++argv)
 235                         install_dir(*argv);
 236                 exit(EX_OK);
 237                 /* NOTREACHED */
 238         }
 239
 240         to_name = argv[argc - 1];
 241         no_target = stat(to_name, &to_sb);
 242         if (!no_target && S_ISDIR(to_sb.st_mode)) {
 243                 for (; *argv != to_name; ++argv)
 244                         install(*argv, to_name, fset, fclr, iflags | DIRECTORY);
 245                 exit(EX_OK);
 246                 /* NOTREACHED */
 247         }
 248
 249         /* can't do file1 file2 directory/file */
 250         if (argc != 2) {
 251                 if (no_target)
 252                         warnx("target directory `%s' does not exist",
 253                             argv[argc - 1]);
 254                 else
 255                         warnx("target `%s' is not a directory",
 256                             argv[argc - 1]);
 257                 usage();
 258         }
 259
 260         if (!no_target) {
 261                 if (stat(*argv, &from_sb))
 262                         err(EX_OSERR, "%s", *argv);
 263                 if (!S_ISREG(to_sb.st_mode)) {
 264                         errno = EFTYPE;
 265                         err(EX_OSERR, "%s", to_name);
 266                 }
 267                 if (to_sb.st_dev == from_sb.st_dev &&
 268                     to_sb.st_ino == from_sb.st_ino)
 269                         errx(EX_USAGE,
 270                             "%s and %s are the same file", *argv, to_name);
 271         }
 272         install(*argv, to_name, fset, fclr, iflags);
 273         exit(EX_OK);
 274         /* NOTREACHED */
 275 }
 276
 277 u_long
 278 numeric_id(const char *name, const char *type)
 279 {
 280         u_long val;
 281         char *ep;
 282
 283         /*
 284          * XXX
 285          * We know that uid_t's and gid_t's are unsigned longs.
 286          */
 287         errno = 0;
 288         val = strtoul(name, &ep, 10);
 289         if (errno)
 290                 err(EX_NOUSER, "%s", name);
 291         if (*ep != '\0')
 292                 errx(EX_NOUSER, "unknown %s %s", type, name);
 293         return (val);
 294 }
 295
 296 static
 297 int
 298 file_getgroup(const char *etcdir, const char *group, gid_t *gidret)
 299 {
 300         FILE *fp;
 301         size_t len;
 302         size_t grlen;
 303         char *path;
 304         char *ptr;
 305         char *scan;
 306
 307         grlen = strlen(group);
 308
 309         if (asprintf(&path, "%s/group", etcdir) < 0)
 310                 errx(EX_OSERR, "asprintf()");
 311         if ((fp = fopen(path, "r")) != NULL) {
 312                 while ((ptr = fgetln(fp, &len)) != NULL && len) {
 313                         ptr[len - 1] = 0;
 314                         if ((scan = strchr(ptr, ':')) == NULL)
 315                                 continue;
 316                         if ((size_t)(scan - ptr) != grlen)
 317                                 continue;
 318                         if (strncmp(ptr, group, grlen) != 0)
 319                                 continue;
 320                         if ((scan = strchr(scan + 1, ':')) == NULL)
 321                                 continue;
 322                         *gidret = strtoul(scan + 1, NULL, 10);
 323                         break;
 324                 }
 325                 fclose(fp);
 326         }
 327         free(path);
 328         return((*gidret == (gid_t)-1) ? 0 : 1);
 329 }
 330
 331 static
 332 int
 333 file_getowner(const char *etcdir, const char *owner, uid_t *uidret)
 334 {
 335         FILE *fp;
 336         size_t len;
 337         size_t owner_len;
 338         char *path;
 339         char *ptr;
 340         char *scan;
 341
 342         owner_len = strlen(owner);
 343
 344         if (asprintf(&path, "%s/master.passwd", etcdir) < 0)
 345                 errx(EX_OSERR, "asprintf()");
 346         if ((fp = fopen(path, "r")) != NULL) {
 347                 while ((ptr = fgetln(fp, &len)) != NULL && len) {
 348                         ptr[len - 1] = 0;
 349                         if ((scan = strchr(ptr, ':')) == NULL)
 350                                 continue;
 351                         if ((size_t)(scan - ptr) != owner_len)
 352                                 continue;
 353                         if (strncmp(ptr, owner, owner_len) != 0)
 354                                 continue;
 355                         if ((scan = strchr(scan + 1, ':')) == NULL)
 356                                 continue;
 357                         *uidret = strtoul(scan + 1, NULL, 10);
 358                         break;
 359                 }
 360                 fclose(fp);
 361         }
 362         free(path);
 363         return((*uidret == (uid_t)-1) ? 0 : 1);
 364 }
 365
 366 /*
 367  * install --
 368  *      build a path name and install the file
 369  */
 370 static void
 371 install(const char *from_name, const char *to_name, u_long fset, u_long fclr,
 372         u_int flags)
 373 {
 374         struct stat from_sb, temp_sb, to_sb;
 375         struct utimbuf utb;
 376         int devnull, files_match, from_fd, serrno, target;
 377         int tempcopy, temp_fd, to_fd;
 378         u_long nfset;
 379         char backup[MAXPATHLEN], *p, pathbuf[MAXPATHLEN], tempfile[MAXPATHLEN];
 380
 381         files_match = 0;
 382         from_fd = -1;
 383
 384         /* If try to install NULL file to a directory, fails. */
 385         if (flags & DIRECTORY || strcmp(from_name, _PATH_DEVNULL)) {
 386                 if (stat(from_name, &from_sb))
 387                         err(EX_OSERR, "%s", from_name);
 388                 if (!S_ISREG(from_sb.st_mode)) {
 389                         errno = EFTYPE;
 390                         err(EX_OSERR, "%s", from_name);
 391                 }
 392                 /* Build the target path. */
 393                 if (flags & DIRECTORY) {
 394                         (void)snprintf(pathbuf, sizeof(pathbuf), "%s/%s",
 395                             to_name,
 396                             (p = strrchr(from_name, '/')) ? ++p : from_name);
 397                         to_name = pathbuf;
 398                 }
 399                 devnull = 0;
 400         } else {
 401                 devnull = 1;
 402         }
 403
 404         target = stat(to_name, &to_sb) == 0;
 405
 406         /* Only install to regular files. */
 407         if (target && !S_ISREG(to_sb.st_mode)) {
 408                 errno = EFTYPE;
 409                 warn("%s", to_name);
 410                 return;
 411         }
 412
 413         /* Only copy safe if the target exists. */
 414         tempcopy = safecopy && target;
 415
 416         if (!devnull && (from_fd = open(from_name, O_RDONLY, 0)) < 0)
 417                 err(EX_OSERR, "%s", from_name);
 418
 419         /* If we don't strip, we can compare first. */
 420         if (docompare && !dostrip && target) {
 421                 if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
 422                         err(EX_OSERR, "%s", to_name);
 423                 if (devnull)
 424                         files_match = to_sb.st_size == 0;
 425                 else
 426                         files_match = !(compare(from_fd, from_name,
 427                             (size_t)from_sb.st_size, to_fd,
 428                             to_name, (size_t)to_sb.st_size));
 429
 430                 /* Close "to" file unless we match. */
 431                 if (!files_match)
 432                         (void)close(to_fd);
 433         }
 434
 435         if (!files_match) {
 436                 if (tempcopy) {
 437                         to_fd = create_tempfile(to_name, tempfile,
 438                             sizeof(tempfile));
 439                         if (to_fd < 0)
 440                                 err(EX_OSERR, "%s", tempfile);
 441                 } else {
 442                         if ((to_fd = create_newfile(to_name, target,
 443                             &to_sb)) < 0)
 444                                 err(EX_OSERR, "%s", to_name);
 445                         if (verbose)
 446                                 (void)printf("install: %s -> %s\n",
 447                                     from_name, to_name);
 448                 }
 449                 if (!devnull)
 450                         copy(from_fd, from_name, to_fd,
 451                              tempcopy ? tempfile : to_name, from_sb.st_size);
 452         }
 453
 454         if (dostrip) {
 455                 strip(tempcopy ? tempfile : to_name);
 456
 457                 /*
 458                  * Re-open our fd on the target, in case we used a strip
 459                  * that does not work in-place -- like GNU binutils strip.
 460                  */
 461                 close(to_fd);
 462                 to_fd = open(tempcopy ? tempfile : to_name, O_RDONLY, 0);
 463                 if (to_fd < 0)
 464                         err(EX_OSERR, "stripping %s", to_name);
 465         }
 466
 467         /*
 468          * Compare the stripped temp file with the target.
 469          */
 470         if (docompare && dostrip && target) {
 471                 temp_fd = to_fd;
 472
 473                 /* Re-open to_fd using the real target name. */
 474                 if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
 475                         err(EX_OSERR, "%s", to_name);
 476
 477                 if (fstat(temp_fd, &temp_sb)) {
 478                         serrno = errno;
 479                         (void)unlink(tempfile);
 480                         errno = serrno;
 481                         err(EX_OSERR, "%s", tempfile);
 482                 }
 483
 484                 if (compare(temp_fd, tempfile, (size_t)temp_sb.st_size, to_fd,
 485                             to_name, (size_t)to_sb.st_size) == 0) {
 486                         /*
 487                          * If target has more than one link we need to
 488                          * replace it in order to snap the extra links.
 489                          * Need to preserve target file times, though.
 490                          */
 491                         if (to_sb.st_nlink != 1) {
 492                                 utb.actime = to_sb.st_atime;
 493                                 utb.modtime = to_sb.st_mtime;
 494                                 utime(tempfile, &utb);
 495                         } else {
 496                                 files_match = 1;
 497                                 (void)unlink(tempfile);
 498                         }
 499                         (void) close(temp_fd);
 500                 }
 501         }
 502
 503         /*
 504          * Move the new file into place if doing a safe copy
 505          * and the files are different (or just not compared).
 506          */
 507         if (tempcopy && !files_match) {
 508                 /* Try to turn off the immutable bits. */
 509                 if (to_sb.st_flags & NOCHANGEBITS)
 510                         (void)chflags(to_name, to_sb.st_flags & ~NOCHANGEBITS);
 511                 if (dobackup) {
 512                         if ((size_t)snprintf(backup, MAXPATHLEN, "%s%s", to_name,
 513                             suffix) != strlen(to_name) + strlen(suffix)) {
 514                                 unlink(tempfile);
 515                                 errx(EX_OSERR, "%s: backup filename too long",
 516                                     to_name);
 517                         }
 518                         if (verbose)
 519                                 (void)printf("install: %s -> %s\n", to_name, backup);
 520                         if (rename(to_name, backup) < 0) {
 521                                 serrno = errno;
 522                                 unlink(tempfile);
 523                                 errno = serrno;
 524                                 err(EX_OSERR, "rename: %s to %s", to_name,
 525                                      backup);
 526                         }
 527                 }
 528                 if (verbose)
 529                         (void)printf("install: %s -> %s\n", from_name, to_name);
 530                 if (rename(tempfile, to_name) < 0) {
 531                         serrno = errno;
 532                         unlink(tempfile);
 533                         errno = serrno;
 534                         err(EX_OSERR, "rename: %s to %s",
 535                             tempfile, to_name);
 536                 }
 537
 538                 /* Re-open to_fd so we aren't hosed by the rename(2). */
 539                 (void) close(to_fd);
 540                 if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
 541                         err(EX_OSERR, "%s", to_name);
 542         }
 543
 544         /*
 545          * Preserve the timestamp of the source file if necessary.
 546          */
 547         if (dopreserve && !files_match && !devnull) {
 548                 utb.actime = from_sb.st_atime;
 549                 utb.modtime = from_sb.st_mtime;
 550                 utime(to_name, &utb);
 551         }
 552
 553         if (fstat(to_fd, &to_sb) == -1) {
 554                 serrno = errno;
 555                 (void)unlink(to_name);
 556                 errno = serrno;
 557                 err(EX_OSERR, "%s", to_name);
 558         }
 559
 560         /*
 561          * Set owner, group, mode for target; do the chown first,
 562          * chown may lose the setuid bits.
 563          */
 564         if (!dounpriv && ((gid != (gid_t)-1 && gid != to_sb.st_gid) ||
 565             (uid != (uid_t)-1 && uid != to_sb.st_uid) ||
 566             (mode != to_sb.st_mode))) {
 567                 /* Try to turn off the immutable bits. */
 568                 if (to_sb.st_flags & NOCHANGEBITS)
 569                         (void)fchflags(to_fd, to_sb.st_flags & ~NOCHANGEBITS);
 570         }
 571
 572         if (!dounpriv && (
 573             (gid != (gid_t)-1 && gid != to_sb.st_gid) ||
 574             (uid != (uid_t)-1 && uid != to_sb.st_uid)))
 575                 if (fchown(to_fd, uid, gid) == -1) {
 576                         serrno = errno;
 577                         (void)unlink(to_name);
 578                         errno = serrno;
 579                         err(EX_OSERR,"%s: chown/chgrp", to_name);
 580                 }
 581
 582         if (mode != to_sb.st_mode) {
 583                 if (fchmod(to_fd,
 584                      dounpriv ? mode & (S_IRWXU|S_IRWXG|S_IRWXO) : mode)) {
 585                         serrno = errno;
 586                         (void)unlink(to_name);
 587                         errno = serrno;
 588                         err(EX_OSERR, "%s: chmod", to_name);
 589                 }
 590         }
 591
 592         /*
 593          * If provided a set of flags, set them, otherwise, preserve the
 594          * flags, except for the dump and history flags.  The dump flag
 595          * is left clear on the target while the history flag from when
 596          * the target was created (which is inherited from the target's
 597          * parent directory) is retained.
 598          */
 599         if (flags & SETFLAGS) {
 600                 nfset = (to_sb.st_flags | fset) & ~fclr;
 601         } else {
 602                 nfset = (from_sb.st_flags & ~(UF_NODUMP | UF_NOHISTORY)) |
 603                         (to_sb.st_flags & UF_NOHISTORY);
 604         }
 605
 606         /*
 607          * NFS does not support flags.  Ignore EOPNOTSUPP flags if we're just
 608          * trying to turn off UF_NODUMP.  If we're trying to set real flags,
 609          * then warn if the fs doesn't support it, otherwise fail.
 610          */
 611         if (!dounpriv && !devnull && fchflags(to_fd, nfset)) {
 612                 if (flags & SETFLAGS) {
 613                         if (errno == EOPNOTSUPP)
 614                                 warn("%s: chflags", to_name);
 615                         else {
 616                                 serrno = errno;
 617                                 (void)unlink(to_name);
 618                                 errno = serrno;
 619                                 err(EX_OSERR, "%s: chflags", to_name);
 620                         }
 621                 }
 622         }
 623
 624         (void)close(to_fd);
 625         if (!devnull)
 626                 (void)close(from_fd);
 627 }
 628
 629 /*
 630  * compare --
 631  *      compare two files; non-zero means files differ
 632  */
 633 static int
 634 compare(int from_fd, const char *from_name __unused, size_t from_len,
 635         int to_fd, const char *to_name __unused, size_t to_len)
 636 {
 637         char *p, *q;
 638         int rv;
 639         int done_compare;
 640
 641         rv = 0;
 642         if (from_len != to_len)
 643                 return 1;
 644
 645         if (from_len <= MAX_CMP_SIZE) {
 646                 done_compare = 0;
 647                 if (trymmap(from_fd) && trymmap(to_fd)) {
 648                         p = mmap(NULL, from_len, PROT_READ, MAP_SHARED, from_fd, (off_t)0);
 649                         if (p == (char *)MAP_FAILED)
 650                                 goto out;
 651                         q = mmap(NULL, from_len, PROT_READ, MAP_SHARED, to_fd, (off_t)0);
 652                         if (q == (char *)MAP_FAILED) {
 653                                 munmap(p, from_len);
 654                                 goto out;
 655                         }
 656
 657                         rv = memcmp(p, q, from_len);
 658                         munmap(p, from_len);
 659                         munmap(q, from_len);
 660                         done_compare = 1;
 661                 }
 662         out:
 663                 if (!done_compare) {
 664                         char buf1[MAXBSIZE];
 665                         char buf2[MAXBSIZE];
 666                         int n1, n2;
 667
 668                         rv = 0;
 669                         lseek(from_fd, 0, SEEK_SET);
 670                         lseek(to_fd, 0, SEEK_SET);
 671                         while (rv == 0) {
 672                                 n1 = read(from_fd, buf1, sizeof(buf1));
 673                                 if (n1 == 0)
 674                                         break;          /* EOF */
 675                                 else if (n1 > 0) {
 676                                         n2 = read(to_fd, buf2, n1);
 677                                         if (n2 == n1)
 678                                                 rv = memcmp(buf1, buf2, n1);
 679                                         else
 680                                                 rv = 1; /* out of sync */
 681                                 } else
 682                                         rv = 1;         /* read failure */
 683                         }
 684                         lseek(from_fd, 0, SEEK_SET);
 685                         lseek(to_fd, 0, SEEK_SET);
 686                 }
 687         } else
 688                 rv = 1; /* don't bother in this case */
 689
 690         return rv;
 691 }
 692
 693 /*
 694  * create_tempfile --
 695  *      create a temporary file based on path and open it
 696  */
 697 static int
 698 create_tempfile(const char *path, char *temp, size_t tsize)
 699 {
 700         char *p;
 701
 702         (void)strncpy(temp, path, tsize);
 703         temp[tsize - 1] = '\0';
 704         if ((p = strrchr(temp, '/')) != NULL)
 705                 p++;
 706         else
 707                 p = temp;
 708         (void)strncpy(p, "INS@XXXX", &temp[tsize - 1] - p);
 709         temp[tsize - 1] = '\0';
 710         return (mkstemp(temp));
 711 }
 712
 713 /*
 714  * create_newfile --
 715  *      create a new file, overwriting an existing one if necessary
 716  */
 717 static int
 718 create_newfile(const char *path, int target, struct stat *sbp)
 719 {
 720         char backup[MAXPATHLEN];
 721
 722         if (target) {
 723                 /*
 724                  * Unlink now... avoid ETXTBSY errors later.  Try to turn
 725                  * off the append/immutable bits -- if we fail, go ahead,
 726                  * it might work.
 727                  */
 728                 if (sbp->st_flags & NOCHANGEBITS)
 729                         (void)chflags(path, sbp->st_flags & ~NOCHANGEBITS);
 730
 731                 if (dobackup) {
 732                         if ((size_t)snprintf(backup, MAXPATHLEN, "%s%s",
 733                             path, suffix) != strlen(path) + strlen(suffix))
 734                                 errx(EX_OSERR, "%s: backup filename too long",
 735                                     path);
 736                         (void)snprintf(backup, MAXPATHLEN, "%s%s",
 737                             path, suffix);
 738                         if (verbose)
 739                                 (void)printf("install: %s -> %s\n",
 740                                     path, backup);
 741                         if (rename(path, backup) < 0)
 742                                 err(EX_OSERR, "rename: %s to %s", path, backup);
 743                 } else
 744                         unlink(path);
 745         }
 746
 747         return (open(path, O_CREAT | O_RDWR | O_TRUNC, S_IRUSR | S_IWUSR));
 748 }
 749
 750 /*
 751  * copy --
 752  *      copy from one file to another
 753  */
 754 static void
 755 copy(int from_fd, const char *from_name, int to_fd,
 756      const char *to_name, off_t size)
 757 {
 758         int nr, nw;
 759         int serrno;
 760         char *p;
 761         char buf[MAXBSIZE];
 762         int done_copy;
 763
 764         /* Rewind file descriptors. */
 765         if (lseek(from_fd, (off_t)0, SEEK_SET) == (off_t)-1)
 766                 err(EX_OSERR, "lseek: %s", from_name);
 767         if (lseek(to_fd, (off_t)0, SEEK_SET) == (off_t)-1)
 768                 err(EX_OSERR, "lseek: %s", to_name);
 769
 770         /*
 771          * Mmap and write if less than 8M (the limit is so we don't totally
 772          * trash memory on big files.  This is really a minor hack, but it
 773          * wins some CPU back.
 774          */
 775         done_copy = 0;
 776         if (size <= 8 * 1048576 && trymmap(from_fd) &&
 777             (p = mmap(NULL, (size_t)size, PROT_READ, MAP_SHARED,
 778                     from_fd, (off_t)0)) != (char *)MAP_FAILED) {
 779                 if ((nw = write(to_fd, p, size)) != size) {
 780                         serrno = errno;
 781                         (void)unlink(to_name);
 782                         errno = nw > 0 ? EIO : serrno;
 783                         err(EX_OSERR, "%s", to_name);
 784                 }
 785                 done_copy = 1;
 786         }
 787         if (!done_copy) {
 788                 while ((nr = read(from_fd, buf, sizeof(buf))) > 0) {
 789                         if ((nw = write(to_fd, buf, nr)) != nr) {
 790                                 serrno = errno;
 791                                 (void)unlink(to_name);
 792                                 errno = nw > 0 ? EIO : serrno;
 793                                 err(EX_OSERR, "%s", to_name);
 794                         }
 795                 }
 796                 if (nr != 0) {
 797                         serrno = errno;
 798                         (void)unlink(to_name);
 799                         errno = serrno;
 800                         err(EX_OSERR, "%s", from_name);
 801                 }
 802         }
 803 }
 804
 805 /*
 806  * strip --
 807  *      use strip(1) to strip the target file
 808  */
 809 static void
 810 strip(const char *to_name)
 811 {
 812         const char *stripbin;
 813         int serrno, status;
 814
 815         switch (fork()) {
 816         case -1:
 817                 serrno = errno;
 818                 (void)unlink(to_name);
 819                 errno = serrno;
 820                 err(EX_TEMPFAIL, "fork");
 821         case 0:
 822                 stripbin = getenv("STRIPBIN");
 823                 if (stripbin == NULL)
 824                         stripbin = "strip";
 825                 execlp(stripbin, stripbin, to_name, NULL);
 826                 err(EX_OSERR, "exec(%s)", stripbin);
 827         default:
 828                 if (wait(&status) == -1 || status) {
 829                         serrno = errno;
 830                         (void)unlink(to_name);
 831                         errc(EX_SOFTWARE, serrno, "wait");
 832                         /* NOTREACHED */
 833                 }
 834         }
 835 }
 836
 837 /*
 838  * When doing a concurrent make -j N multiple install's can race the mkdir.
 839  */
 840 static
 841 int
 842 mkdir_race(const char *path, int nmode)
 843 {
 844         int res;
 845         struct stat sb;
 846
 847         res = mkdir(path, nmode);
 848         if (res < 0 && errno == EEXIST) {
 849                 if (stat(path, &sb) == 0 && S_ISDIR(sb.st_mode))
 850                         return(0);
 851                 res = mkdir(path, nmode);
 852         }
 853         return (res);
 854 }
 855
 856 /*
 857  * install_dir --
 858  *      build directory hierarchy
 859  */
 860 static void
 861 install_dir(char *path)
 862 {
 863         char *p;
 864         struct stat sb;
 865         int ch;
 866
 867         for (p = path;; ++p)
 868                 if (!*p || (p != path && *p  == '/')) {
 869                         ch = *p;
 870                         *p = '\0';
 871                         if (stat(path, &sb)) {
 872                                 if (errno != ENOENT ||
 873                                     mkdir_race(path, 0755) < 0) {
 874                                         err(EX_OSERR, "mkdir %s", path);
 875                                         /* NOTREACHED */
 876                                 } else if (verbose)
 877                                         (void)printf("install: mkdir %s\n",
 878                                                      path);
 879                         } else if (!S_ISDIR(sb.st_mode))
 880                                 errx(EX_OSERR, "%s exists but is not a directory", path);
 881                         if (!(*p = ch))
 882                                 break;
 883                 }
 884
 885         if (!dounpriv) {
 886                 if ((gid != (gid_t)-1 || uid != (uid_t)-1) &&
 887                     chown(path, uid, gid))
 888                         warn("chown %u:%u %s", uid, gid, path);
 889                 /* XXXBED: should we do the chmod in the dounpriv case? */
 890                 if (chmod(path, mode))
 891                         warn("chmod %o %s", mode, path);
 892         }
 893 }
 894
 895 /*
 896  * usage --
 897  *      print a usage message and die
 898  */
 899 static void
 900 usage(void)
 901 {
 902         fprintf(stderr,
 903 "usage: install [-bCcpSsUv] [-B suffix] [-D dest] [-f flags] [-g group]\n"
 904 "               [-m mode] [-o owner] file1 file2\n"
 905 "       install [-bCcpSsUv] [-B suffix] [-D dest] [-f flags] [-g group]\n"
 906 "               [-m mode] [-o owner] file1 ... fileN directory\n"
 907 "       install -d [-lUv] [-D dest] [-g group] [-m mode] [-o owner]\n"
 908 "               directory ...\n");
 909         exit(EX_USAGE);
 910         /* NOTREACHED */
 911 }
 912
 913 /*
 914  * trymmap --
 915  *      return true (1) if mmap should be tried, false (0) if not.
 916  */
 917 static int
 918 trymmap(int fd)
 919 {
 920 /*
 921  * The ifdef is for bootstrapping - f_fstypename doesn't exist in
 922  * pre-Lite2-merge systems.
 923  */
 924 #ifdef MFSNAMELEN
 925         struct statfs stfs;
 926
 927         if (nommap || fstatfs(fd, &stfs) != 0)
 928                 return (0);
 929         if (strcmp(stfs.f_fstypename, "ufs") == 0 ||
 930             strcmp(stfs.f_fstypename, "cd9660") == 0)
 931                 return (1);
 932 #endif
 933         return (0);
 934 }