usr.bin/xinstall/xinstall.c

   1 /*
   2  * Copyright (c) 1987, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1987, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)xinstall.c       8.1 (Berkeley) 7/21/93
  35  * $FreeBSD: src/usr.bin/xinstall/xinstall.c,v 1.38.2.8 2002/08/07 16:29:48 ru Exp $
  36  * $DragonFly: src/usr.bin/xinstall/xinstall.c,v 1.5 2004/09/23 19:13:51 dillon Exp $
  37  */
  38
  39 #include <sys/param.h>
  40 #include <sys/mman.h>
  41 #include <sys/mount.h>
  42 #include <sys/stat.h>
  43 #include <sys/wait.h>
  44
  45 #include <ctype.h>
  46 #include <err.h>
  47 #include <errno.h>
  48 #include <fcntl.h>
  49 #include <grp.h>
  50 #include <paths.h>
  51 #include <pwd.h>
  52 #include <stdio.h>
  53 #include <stdlib.h>
  54 #include <string.h>
  55 #include <sysexits.h>
  56 #include <unistd.h>
  57 #include <utime.h>
  58
  59 #include "pathnames.h"
  60
  61 /* Bootstrap aid - this doesn't exist in most older releases */
  62 #ifndef MAP_FAILED
  63 #define MAP_FAILED ((void *)-1) /* from <sys/mman.h> */
  64 #endif
  65
  66 #define MAX_CMP_SIZE    (16 * 1024 * 1024)
  67
  68 #define DIRECTORY       0x01            /* Tell install it's a directory. */
  69 #define SETFLAGS        0x02            /* Tell install to set flags. */
  70 #define NOCHANGEBITS    (UF_IMMUTABLE | UF_APPEND | SF_IMMUTABLE | SF_APPEND)
  71 #define BACKUP_SUFFIX   ".old"
  72
  73 struct passwd *pp;
  74 struct group *gp;
  75 gid_t gid;
  76 uid_t uid;
  77 int dobackup, docompare, dodir, dopreserve, dostrip, nommap, safecopy, verbose;
  78 mode_t mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
  79 const char *suffix = BACKUP_SUFFIX;
  80
  81 static int file_getgroup(const char *etcdir, const char *group, gid_t *gid);
  82 static int file_getowner(const char *etcdir, const char *owner, uid_t *uid);
  83
  84 void    copy(int, const char *, int, const char *, off_t);
  85 int     compare(int, const char *, size_t, int, const char *, size_t);
  86 int     create_newfile(const char *, int, struct stat *);
  87 int     create_tempfile(const char *, char *, size_t);
  88 void    install(const char *, const char *, u_long, u_int);
  89 void    install_dir(char *);
  90 u_long  numeric_id(const char *, const char *);
  91 void    strip(const char *);
  92 int     trymmap(int);
  93 void    usage(void);
  94
  95 int
  96 main(int argc, char **argv)
  97 {
  98         struct stat from_sb, to_sb;
  99         mode_t *set;
 100         u_long fset;
 101         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")) != -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 'f':
 135                         flags = optarg;
 136                         if (strtofflags(&flags, &fset, NULL))
 137                                 errx(EX_USAGE, "%s: invalid flag", flags);
 138                         iflags |= SETFLAGS;
 139                         break;
 140                 case 'g':
 141                         group = 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 'v':
 169                         verbose = 1;
 170                         break;
 171                 case '?':
 172                 default:
 173                         usage();
 174                 }
 175         argc -= optind;
 176         argv += optind;
 177
 178         /* some options make no sense when creating directories */
 179         if (dostrip && dodir)
 180                 usage();
 181
 182         /* must have at least two arguments, except when creating directories */
 183         if (argc < 2 && !dodir)
 184                 usage();
 185
 186         /* need to make a temp copy so we can compare stripped version */
 187         if (docompare && dostrip)
 188                 safecopy = 1;
 189
 190         /* no etcdir specified, always try the system */
 191         if (etcdir == NULL)
 192                 trysys = 1;
 193         uid = (uid_t)-1;
 194         gid = (gid_t)-1;
 195
 196         /* get group and owner id's */
 197         if (group != NULL) {
 198                 if (etcdir && file_getgroup(etcdir, group, &gid)) {
 199                         ;
 200                 } else if (trysys && (gp = getgrnam(group)) != NULL) {
 201                         gid = gp->gr_gid;
 202                 } else {
 203                         gid = (gid_t)numeric_id(group, "group");
 204                 }
 205         }
 206
 207         if (owner != NULL) {
 208                 if (etcdir && file_getowner(etcdir, owner, &uid)) {
 209                         ;
 210                 } else if (trysys && (pp = getpwnam(owner)) != NULL) {
 211                         uid = pp->pw_uid;
 212                 } else {
 213                         uid = (uid_t)numeric_id(owner, "user");
 214                 }
 215         }
 216
 217         if (dodir) {
 218                 for (; *argv != NULL; ++argv)
 219                         install_dir(*argv);
 220                 exit(EX_OK);
 221                 /* NOTREACHED */
 222         }
 223
 224         no_target = stat(to_name = argv[argc - 1], &to_sb);
 225         if (!no_target && S_ISDIR(to_sb.st_mode)) {
 226                 for (; *argv != to_name; ++argv)
 227                         install(*argv, to_name, fset, iflags | DIRECTORY);
 228                 exit(EX_OK);
 229                 /* NOTREACHED */
 230         }
 231
 232         /* can't do file1 file2 directory/file */
 233         if (argc != 2)
 234                 usage();
 235
 236         if (!no_target) {
 237                 if (stat(*argv, &from_sb))
 238                         err(EX_OSERR, "%s", *argv);
 239                 if (!S_ISREG(to_sb.st_mode)) {
 240                         errno = EFTYPE;
 241                         err(EX_OSERR, "%s", to_name);
 242                 }
 243                 if (to_sb.st_dev == from_sb.st_dev &&
 244                     to_sb.st_ino == from_sb.st_ino)
 245                         errx(EX_USAGE,
 246                             "%s and %s are the same file", *argv, to_name);
 247         }
 248         install(*argv, to_name, fset, iflags);
 249         exit(EX_OK);
 250         /* NOTREACHED */
 251 }
 252
 253 u_long
 254 numeric_id(const char *name, const char *type)
 255 {
 256         u_long val;
 257         char *ep;
 258
 259         /*
 260          * XXX
 261          * We know that uid_t's and gid_t's are unsigned longs.
 262          */
 263         errno = 0;
 264         val = strtoul(name, &ep, 10);
 265         if (errno)
 266                 err(EX_NOUSER, "%s", name);
 267         if (*ep != '\0')
 268                 errx(EX_NOUSER, "unknown %s %s", type, name);
 269         return (val);
 270 }
 271
 272 static
 273 int
 274 file_getgroup(const char *etcdir, const char *group, gid_t *gid)
 275 {
 276         FILE *fp;
 277         size_t len;
 278         size_t grlen;
 279         char *path;
 280         char *ptr;
 281         char *scan;
 282
 283         grlen = strlen(group);
 284
 285         if (asprintf(&path, "%s/group", etcdir) < 0)
 286                 errx(EX_OSERR, "asprintf()");
 287         if ((fp = fopen(path, "r")) != NULL) {
 288                 while ((ptr = fgetln(fp, &len)) != NULL && len) {
 289                         ptr[len - 1] = 0;
 290                         if ((scan = strchr(ptr, ':')) == NULL)
 291                                 continue;
 292                         if (scan - ptr != grlen)
 293                                 continue;
 294                         if (strncmp(ptr, group, grlen) != 0)
 295                                 continue;
 296                         if ((scan = strchr(scan + 1, ':')) == NULL)
 297                                 continue;
 298                         *gid = strtoul(scan + 1, NULL, 10);
 299                         break;
 300                 }
 301                 fclose(fp);
 302         }
 303         free(path);
 304         return((*gid == (gid_t)-1) ? 0 : 1);
 305 }
 306
 307 static
 308 int
 309 file_getowner(const char *etcdir, const char *owner, uid_t *uid)
 310 {
 311         FILE *fp;
 312         size_t len;
 313         size_t owner_len;
 314         char *path;
 315         char *ptr;
 316         char *scan;
 317
 318         owner_len = strlen(owner);
 319
 320         if (asprintf(&path, "%s/master.passwd", etcdir) < 0)
 321                 errx(EX_OSERR, "asprintf()");
 322         if ((fp = fopen(path, "r")) != NULL) {
 323                 while ((ptr = fgetln(fp, &len)) != NULL && len) {
 324                         ptr[len - 1] = 0;
 325                         if ((scan = strchr(ptr, ':')) == NULL)
 326                                 continue;
 327                         if (scan - ptr != owner_len)
 328                                 continue;
 329                         if (strncmp(ptr, owner, owner_len) != 0)
 330                                 continue;
 331                         if ((scan = strchr(scan + 1, ':')) == NULL)
 332                                 continue;
 333                         *uid = strtoul(scan + 1, NULL, 10);
 334                         break;
 335                 }
 336                 fclose(fp);
 337         }
 338         free(path);
 339         return((*uid == (uid_t)-1) ? 0 : 1);
 340 }
 341
 342 /*
 343  * install --
 344  *      build a path name and install the file
 345  */
 346 void
 347 install(const char *from_name, const char *to_name, u_long fset, u_int flags)
 348 {
 349         struct stat from_sb, temp_sb, to_sb;
 350         struct utimbuf utb;
 351         int devnull, files_match, from_fd, serrno, target;
 352         int tempcopy, temp_fd, to_fd;
 353         char backup[MAXPATHLEN], *p, pathbuf[MAXPATHLEN], tempfile[MAXPATHLEN];
 354
 355         files_match = 0;
 356
 357         /* If try to install NULL file to a directory, fails. */
 358         if (flags & DIRECTORY || strcmp(from_name, _PATH_DEVNULL)) {
 359                 if (stat(from_name, &from_sb))
 360                         err(EX_OSERR, "%s", from_name);
 361                 if (!S_ISREG(from_sb.st_mode)) {
 362                         errno = EFTYPE;
 363                         err(EX_OSERR, "%s", from_name);
 364                 }
 365                 /* Build the target path. */
 366                 if (flags & DIRECTORY) {
 367                         snprintf(pathbuf, sizeof(pathbuf), "%s/%s",
 368                             to_name,
 369                             (p = strrchr(from_name, '/')) ? ++p : from_name);
 370                         to_name = pathbuf;
 371                 }
 372                 devnull = 0;
 373         } else {
 374                 devnull = 1;
 375         }
 376
 377         target = stat(to_name, &to_sb) == 0;
 378
 379         /* Only install to regular files. */
 380         if (target && !S_ISREG(to_sb.st_mode)) {
 381                 errno = EFTYPE;
 382                 warn("%s", to_name);
 383                 return;
 384         }
 385
 386         /* Only copy safe if the target exists. */
 387         tempcopy = safecopy && target;
 388
 389         if (!devnull && (from_fd = open(from_name, O_RDONLY, 0)) < 0)
 390                 err(EX_OSERR, "%s", from_name);
 391
 392         /* If we don't strip, we can compare first. */
 393         if (docompare && !dostrip && target) {
 394                 if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
 395                         err(EX_OSERR, "%s", to_name);
 396                 if (devnull)
 397                         files_match = to_sb.st_size == 0;
 398                 else
 399                         files_match = !(compare(from_fd, from_name,
 400                             (size_t)from_sb.st_size, to_fd,
 401                             to_name, (size_t)to_sb.st_size));
 402
 403                 /* Close "to" file unless we match. */
 404                 if (!files_match)
 405                         close(to_fd);
 406         }
 407
 408         if (!files_match) {
 409                 if (tempcopy) {
 410                         to_fd = create_tempfile(to_name, tempfile,
 411                             sizeof(tempfile));
 412                         if (to_fd < 0)
 413                                 err(EX_OSERR, "%s", tempfile);
 414                 } else {
 415                         if ((to_fd = create_newfile(to_name, target,
 416                             &to_sb)) < 0)
 417                                 err(EX_OSERR, "%s", to_name);
 418                         if (verbose)
 419                                 printf("install: %s -> %s\n",
 420                                     from_name, to_name);
 421                 }
 422                 if (!devnull)
 423                         copy(from_fd, from_name, to_fd,
 424                              tempcopy ? tempfile : to_name, from_sb.st_size);
 425         }
 426
 427         if (dostrip) {
 428                 strip(tempcopy ? tempfile : to_name);
 429
 430                 /*
 431                  * Re-open our fd on the target, in case we used a strip
 432                  * that does not work in-place -- like GNU binutils strip.
 433                  */
 434                 close(to_fd);
 435                 to_fd = open(tempcopy ? tempfile : to_name, O_RDONLY, 0);
 436                 if (to_fd < 0)
 437                         err(EX_OSERR, "stripping %s", to_name);
 438         }
 439
 440         /*
 441          * Compare the stripped temp file with the target.
 442          */
 443         if (docompare && dostrip && target) {
 444                 temp_fd = to_fd;
 445
 446                 /* Re-open to_fd using the real target name. */
 447                 if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
 448                         err(EX_OSERR, "%s", to_name);
 449
 450                 if (fstat(temp_fd, &temp_sb)) {
 451                         serrno = errno;
 452                         unlink(tempfile);
 453                         errno = serrno;
 454                         err(EX_OSERR, "%s", tempfile);
 455                 }
 456
 457                 if (compare(temp_fd, tempfile, (size_t)temp_sb.st_size, to_fd,
 458                             to_name, (size_t)to_sb.st_size) == 0) {
 459                         /*
 460                          * If target has more than one link we need to
 461                          * replace it in order to snap the extra links.
 462                          * Need to preserve target file times, though.
 463                          */
 464                         if (to_sb.st_nlink != 1) {
 465                                 utb.actime = to_sb.st_atime;
 466                                 utb.modtime = to_sb.st_mtime;
 467                                 utime(tempfile, &utb);
 468                         } else {
 469                                 files_match = 1;
 470                                 unlink(tempfile);
 471                         }
 472                         close(temp_fd);
 473                 }
 474         }
 475
 476         /*
 477          * Move the new file into place if doing a safe copy
 478          * and the files are different (or just not compared).
 479          */
 480         if (tempcopy && !files_match) {
 481                 /* Try to turn off the immutable bits. */
 482                 if (to_sb.st_flags & NOCHANGEBITS)
 483                         chflags(to_name, to_sb.st_flags & ~NOCHANGEBITS);
 484                 if (dobackup) {
 485                         if ((size_t)snprintf(backup, MAXPATHLEN, "%s%s", to_name,
 486                             suffix) != strlen(to_name) + strlen(suffix)) {
 487                                 unlink(tempfile);
 488                                 errx(EX_OSERR, "%s: backup filename too long",
 489                                     to_name);
 490                         }
 491                         if (verbose)
 492                                 printf("install: %s -> %s\n", to_name, backup);
 493                         if (rename(to_name, backup) < 0) {
 494                                 serrno = errno;
 495                                 unlink(tempfile);
 496                                 errno = serrno;
 497                                 err(EX_OSERR, "rename: %s to %s", to_name,
 498                                      backup);
 499                         }
 500                 }
 501                 if (verbose)
 502                         printf("install: %s -> %s\n", from_name, to_name);
 503                 if (rename(tempfile, to_name) < 0) {
 504                         serrno = errno;
 505                         unlink(tempfile);
 506                         errno = serrno;
 507                         err(EX_OSERR, "rename: %s to %s",
 508                             tempfile, to_name);
 509                 }
 510
 511                 /* Re-open to_fd so we aren't hosed by the rename(2). */
 512                 close(to_fd);
 513                 if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
 514                         err(EX_OSERR, "%s", to_name);
 515         }
 516
 517         /*
 518          * Preserve the timestamp of the source file if necessary.
 519          */
 520         if (dopreserve && !files_match && !devnull) {
 521                 utb.actime = from_sb.st_atime;
 522                 utb.modtime = from_sb.st_mtime;
 523                 utime(to_name, &utb);
 524         }
 525
 526         if (fstat(to_fd, &to_sb) == -1) {
 527                 serrno = errno;
 528                 unlink(to_name);
 529                 errno = serrno;
 530                 err(EX_OSERR, "%s", to_name);
 531         }
 532
 533         /*
 534          * Set owner, group, mode for target; do the chown first,
 535          * chown may lose the setuid bits.
 536          */
 537         if ((gid != (gid_t)-1 && gid != to_sb.st_gid) ||
 538             (uid != (uid_t)-1 && uid != to_sb.st_uid) ||
 539             (mode != to_sb.st_mode)) {
 540                 /* Try to turn off the immutable bits. */
 541                 if (to_sb.st_flags & NOCHANGEBITS)
 542                         fchflags(to_fd, to_sb.st_flags & ~NOCHANGEBITS);
 543         }
 544
 545         if ((gid != (gid_t)-1 && gid != to_sb.st_gid) ||
 546             (uid != (uid_t)-1 && uid != to_sb.st_uid))
 547                 if (fchown(to_fd, uid, gid) == -1) {
 548                         serrno = errno;
 549                         unlink(to_name);
 550                         errno = serrno;
 551                         err(EX_OSERR,"%s: chown/chgrp", to_name);
 552                 }
 553
 554         if (mode != to_sb.st_mode)
 555                 if (fchmod(to_fd, mode)) {
 556                         serrno = errno;
 557                         unlink(to_name);
 558                         errno = serrno;
 559                         err(EX_OSERR, "%s: chmod", to_name);
 560                 }
 561
 562         /*
 563          * If provided a set of flags, set them, otherwise, preserve the
 564          * flags, except for the dump flag.
 565          * NFS does not support flags.  Ignore EOPNOTSUPP flags if we're just
 566          * trying to turn off UF_NODUMP.  If we're trying to set real flags,
 567          * then warn if the the fs doesn't support it, otherwise fail.
 568          */
 569         if (!devnull && fchflags(to_fd,
 570             flags & SETFLAGS ? fset : from_sb.st_flags & ~UF_NODUMP)) {
 571                 if (flags & SETFLAGS) {
 572                         if (errno == EOPNOTSUPP)
 573                                 warn("%s: chflags", to_name);
 574                         else {
 575                                 serrno = errno;
 576                                 unlink(to_name);
 577                                 errno = serrno;
 578                                 err(EX_OSERR, "%s: chflags", to_name);
 579                         }
 580                 }
 581         }
 582
 583         close(to_fd);
 584         if (!devnull)
 585                 close(from_fd);
 586 }
 587
 588 /*
 589  * compare --
 590  *      compare two files; non-zero means files differ
 591  */
 592 int
 593 compare(int from_fd, const char *from_name __unused, size_t from_len,
 594         int to_fd, const char *to_name __unused, size_t to_len)
 595 {
 596         char *p, *q;
 597         int rv;
 598         int done_compare;
 599
 600         rv = 0;
 601         if (from_len != to_len)
 602                 return 1;
 603
 604         if (from_len <= MAX_CMP_SIZE) {
 605                 done_compare = 0;
 606                 if (trymmap(from_fd) && trymmap(to_fd)) {
 607                         p = mmap(NULL, from_len, PROT_READ, MAP_SHARED, from_fd, (off_t)0);
 608                         if (p == (char *)MAP_FAILED)
 609                                 goto out;
 610                         q = mmap(NULL, from_len, PROT_READ, MAP_SHARED, to_fd, (off_t)0);
 611                         if (q == (char *)MAP_FAILED) {
 612                                 munmap(p, from_len);
 613                                 goto out;
 614                         }
 615
 616                         rv = memcmp(p, q, from_len);
 617                         munmap(p, from_len);
 618                         munmap(q, from_len);
 619                         done_compare = 1;
 620                 }
 621         out:
 622                 if (!done_compare) {
 623                         char buf1[MAXBSIZE];
 624                         char buf2[MAXBSIZE];
 625                         int n1, n2;
 626
 627                         rv = 0;
 628                         lseek(from_fd, 0, SEEK_SET);
 629                         lseek(to_fd, 0, SEEK_SET);
 630                         while (rv == 0) {
 631                                 n1 = read(from_fd, buf1, sizeof(buf1));
 632                                 if (n1 == 0)
 633                                         break;          /* EOF */
 634                                 else if (n1 > 0) {
 635                                         n2 = read(to_fd, buf2, n1);
 636                                         if (n2 == n1)
 637                                                 rv = memcmp(buf1, buf2, n1);
 638                                         else
 639                                                 rv = 1; /* out of sync */
 640                                 } else
 641                                         rv = 1;         /* read failure */
 642                         }
 643                         lseek(from_fd, 0, SEEK_SET);
 644                         lseek(to_fd, 0, SEEK_SET);
 645                 }
 646         } else
 647                 rv = 1; /* don't bother in this case */
 648
 649         return rv;
 650 }
 651
 652 /*
 653  * create_tempfile --
 654  *      create a temporary file based on path and open it
 655  */
 656 int
 657 create_tempfile(const char *path, char *temp, size_t tsize)
 658 {
 659         char *p;
 660
 661         strncpy(temp, path, tsize);
 662         temp[tsize - 1] = '\0';
 663         if ((p = strrchr(temp, '/')) != NULL)
 664                 p++;
 665         else
 666                 p = temp;
 667         strncpy(p, "INS@XXXX", &temp[tsize - 1] - p);
 668         temp[tsize - 1] = '\0';
 669         return (mkstemp(temp));
 670 }
 671
 672 /*
 673  * create_newfile --
 674  *      create a new file, overwriting an existing one if necessary
 675  */
 676 int
 677 create_newfile(const char *path, int target, struct stat *sbp)
 678 {
 679         char backup[MAXPATHLEN];
 680
 681         if (target) {
 682                 /*
 683                  * Unlink now... avoid ETXTBSY errors later.  Try to turn
 684                  * off the append/immutable bits -- if we fail, go ahead,
 685                  * it might work.
 686                  */
 687                 if (sbp->st_flags & NOCHANGEBITS)
 688                         chflags(path, sbp->st_flags & ~NOCHANGEBITS);
 689
 690                 if (dobackup) {
 691                         if ((size_t)snprintf(backup, MAXPATHLEN, "%s%s",
 692                             path, suffix) != strlen(path) + strlen(suffix))
 693                                 errx(EX_OSERR, "%s: backup filename too long",
 694                                     path);
 695                         snprintf(backup, MAXPATHLEN, "%s%s",
 696                             path, suffix);
 697                         if (verbose)
 698                                 printf("install: %s -> %s\n",
 699                                     path, backup);
 700                         if (rename(path, backup) < 0)
 701                                 err(EX_OSERR, "rename: %s to %s", path, backup);
 702                 } else
 703                         unlink(path);
 704         }
 705
 706         return (open(path, O_CREAT | O_RDWR | O_TRUNC, S_IRUSR | S_IWUSR));
 707 }
 708
 709 /*
 710  * copy --
 711  *      copy from one file to another
 712  */
 713 void
 714 copy(int from_fd, const char *from_name, int to_fd,
 715      const char *to_name, off_t size)
 716 {
 717         int nr, nw;
 718         int serrno;
 719         char *p, buf[MAXBSIZE];
 720         int done_copy;
 721
 722         /* Rewind file descriptors. */
 723         if (lseek(from_fd, (off_t)0, SEEK_SET) == (off_t)-1)
 724                 err(EX_OSERR, "lseek: %s", from_name);
 725         if (lseek(to_fd, (off_t)0, SEEK_SET) == (off_t)-1)
 726                 err(EX_OSERR, "lseek: %s", to_name);
 727
 728         /*
 729          * Mmap and write if less than 8M (the limit is so we don't totally
 730          * trash memory on big files.  This is really a minor hack, but it
 731          * wins some CPU back.
 732          */
 733         done_copy = 0;
 734         if (size <= 8 * 1048576 && trymmap(from_fd) &&
 735             (p = mmap(NULL, (size_t)size, PROT_READ, MAP_SHARED,
 736                     from_fd, (off_t)0)) != (char *)MAP_FAILED) {
 737                 if ((nw = write(to_fd, p, size)) != size) {
 738                         serrno = errno;
 739                         unlink(to_name);
 740                         errno = nw > 0 ? EIO : serrno;
 741                         err(EX_OSERR, "%s", to_name);
 742                 }
 743                 done_copy = 1;
 744         }
 745         if (!done_copy) {
 746                 while ((nr = read(from_fd, buf, sizeof(buf))) > 0)
 747                         if ((nw = write(to_fd, buf, nr)) != nr) {
 748                                 serrno = errno;
 749                                 unlink(to_name);
 750                                 errno = nw > 0 ? EIO : serrno;
 751                                 err(EX_OSERR, "%s", to_name);
 752                         }
 753                 if (nr != 0) {
 754                         serrno = errno;
 755                         unlink(to_name);
 756                         errno = serrno;
 757                         err(EX_OSERR, "%s", from_name);
 758                 }
 759         }
 760 }
 761
 762 /*
 763  * strip --
 764  *      use strip(1) to strip the target file
 765  */
 766 void
 767 strip(const char *to_name)
 768 {
 769         const char *stripbin;
 770         int serrno, status;
 771
 772         switch (fork()) {
 773         case -1:
 774                 serrno = errno;
 775                 unlink(to_name);
 776                 errno = serrno;
 777                 err(EX_TEMPFAIL, "fork");
 778         case 0:
 779                 stripbin = getenv("STRIPBIN");
 780                 if (stripbin == NULL)
 781                         stripbin = "strip";
 782                 execlp(stripbin, stripbin, to_name, (char *)NULL);
 783                 err(EX_OSERR, "exec(%s)", stripbin);
 784         default:
 785                 if (wait(&status) == -1 || status) {
 786                         serrno = errno;
 787                         unlink(to_name);
 788                         errc(EX_SOFTWARE, serrno, "wait");
 789                         /* NOTREACHED */
 790                 }
 791         }
 792 }
 793
 794 /*
 795  * install_dir --
 796  *      build directory hierarchy
 797  */
 798 void
 799 install_dir(char *path)
 800 {
 801         char *p;
 802         struct stat sb;
 803         int ch;
 804
 805         for (p = path;; ++p)
 806                 if (!*p || (p != path && *p  == '/')) {
 807                         ch = *p;
 808                         *p = '\0';
 809                         if (stat(path, &sb)) {
 810                                 if (errno != ENOENT || mkdir(path, 0755) < 0) {
 811                                         err(EX_OSERR, "mkdir %s", path);
 812                                         /* NOTREACHED */
 813                                 } else if (verbose)
 814                                         printf("install: mkdir %s\n",
 815                                                      path);
 816                         } else if (!S_ISDIR(sb.st_mode))
 817                                 errx(EX_OSERR, "%s exists but is not a directory", path);
 818                         if (!(*p = ch))
 819                                 break;
 820                 }
 821
 822         if ((gid != (gid_t)-1 || uid != (uid_t)-1) && chown(path, uid, gid))
 823                 warn("chown %u:%u %s", uid, gid, path);
 824         if (chmod(path, mode))
 825                 warn("chmod %o %s", mode, path);
 826 }
 827
 828 /*
 829  * usage --
 830  *      print a usage message and die
 831  */
 832 void
 833 usage(void)
 834 {
 835         fprintf(stderr, "\
 836 usage: install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]\n\
 837                [-o owner] file1 file2\n\
 838        install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]\n\
 839                [-o owner] file1 ... fileN directory\n\
 840        install -d [-v] [-g group] [-m mode] [-o owner] directory ...\n");
 841         exit(EX_USAGE);
 842         /* NOTREACHED */
 843 }
 844
 845 /*
 846  * trymmap --
 847  *      return true (1) if mmap should be tried, false (0) if not.
 848  */
 849 int
 850 trymmap(int fd)
 851 {
 852 /*
 853  * The ifdef is for bootstrapping - f_fstypename doesn't exist in
 854  * pre-Lite2-merge systems.
 855  */
 856 #ifdef MFSNAMELEN
 857         struct statfs stfs;
 858
 859         if (nommap || fstatfs(fd, &stfs) != 0)
 860                 return (0);
 861         if (strcmp(stfs.f_fstypename, "ufs") == 0 ||
 862             strcmp(stfs.f_fstypename, "cd9660") == 0)
 863                 return (1);
 864 #endif
 865         return (0);
 866 }