SETUP/installfile/installfile.c

   1 /*
   2  * Copyright (c) 2012 Apple, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <unistd.h>
  27 #include <stdbool.h>
  28 #include <errno.h>
  29 #include <err.h>
  30 #include <sysexits.h>
  31
  32 #include <sys/stat.h>
  33 #include <sys/fcntl.h>
  34 #include <sys/param.h>
  35 #include <sys/time.h>
  36
  37 #include <copyfile.h>
  38
  39 void usage(void);
  40
  41 int main(int argc, char * argv[])
  42 {
  43         struct stat sb;
  44         void *mset;
  45         mode_t mode;
  46         bool gotmode = false;
  47         int ch;
  48         int ret;
  49         int srcfd, dstfd;
  50         const char *src = NULL;
  51         const char *dst = NULL;
  52         char dsttmpname[MAXPATHLEN];
  53
  54         while ((ch = getopt(argc, argv, "cSm:")) != -1) {
  55                 switch(ch) {
  56                         case 'c':
  57                         case 'S':
  58                                 /* ignored for compatibility */
  59                                 break;
  60                         case 'm':
  61                                 gotmode = true;
  62                                 mset = setmode(optarg);
  63                                 if (!mset)
  64                                         errx(EX_USAGE, "Unrecognized mode %s", optarg);
  65
  66                                 mode = getmode(mset, 0);
  67                                 free(mset);
  68                                 break;
  69                         case '?':
  70                         default:
  71                                 usage();
  72                 }
  73         }
  74
  75         argc -= optind;
  76         argv += optind;
  77
  78         if (argc < 2) {
  79                 usage();
  80         }
  81
  82         src = argv[0];
  83         dst = argv[1];
  84
  85         srcfd = open(src, O_RDONLY | O_SYMLINK, 0);
  86         if (srcfd < 0)
  87                 err(EX_NOINPUT, "open(%s)", src);
  88
  89         ret = fstat(srcfd, &sb);
  90         if (ret < 0)
  91                 err(EX_NOINPUT, "fstat(%s)", src);
  92
  93         if (!S_ISREG(sb.st_mode))
  94                 err(EX_USAGE, "%s is not a regular file", src);
  95
  96         snprintf(dsttmpname, sizeof(dsttmpname), "%s.XXXXXX", dst);
  97
  98         dstfd = mkstemp(dsttmpname);
  99         if (dstfd < 0)
 100                 err(EX_UNAVAILABLE, "mkstemp(%s)", dsttmpname);
 101
 102         ret = fcopyfile(srcfd, dstfd, NULL,
 103                                         COPYFILE_DATA);
 104         if (ret < 0)
 105                 err(EX_UNAVAILABLE, "fcopyfile(%s, %s)", src, dsttmpname);
 106
 107         ret = futimes(dstfd, NULL);
 108         if (ret < 0)
 109                 err(EX_UNAVAILABLE, "futimes(%s)", dsttmpname);
 110
 111         if (gotmode) {
 112                 ret = fchmod(dstfd, mode);
 113                 if (ret < 0)
 114                         err(EX_NOINPUT, "fchmod(%s, %ho)", dsttmpname, mode);
 115         }
 116
 117         ret = rename(dsttmpname, dst);
 118         if (ret < 0)
 119                 err(EX_NOINPUT, "rename(%s, %s)", dsttmpname, dst);
 120
 121         ret = close(dstfd);
 122         if (ret < 0)
 123                 err(EX_NOINPUT, "close(dst)");
 124
 125         ret = close(srcfd);
 126         if (ret < 0)
 127                 err(EX_NOINPUT, "close(src)");
 128
 129         return 0;
 130 }
 131
 132 void usage(void)
 133 {
 134         fprintf(stderr, "Usage: %s [-c] [-S] [-m <mode>] <src> <dst>\n",
 135                         getprogname());
 136         exit(EX_USAGE);
 137 }