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