src/mkdir.c

   1 /* mkdir -- make directories
   2    Copyright (C) 1990-2013 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  16
  17 /* David MacKenzie <djm@ai.mit.edu>  */
  18
  19 #include <config.h>
  20 #include <stdio.h>
  21 #include <getopt.h>
  22 #include <sys/types.h>
  23 #include <selinux/selinux.h>
  24
  25 #include "system.h"
  26 #include "error.h"
  27 #include "mkdir-p.h"
  28 #include "modechange.h"
  29 #include "prog-fprintf.h"
  30 #include "quote.h"
  31 #include "savewd.h"
  32 #include "smack.h"
  33
  34 /* The official name of this program (e.g., no 'g' prefix).  */
  35 #define PROGRAM_NAME "mkdir"
  36
  37 #define AUTHORS proper_name ("David MacKenzie")
  38
  39 static struct option const longopts[] =
  40 {
  41   {GETOPT_SELINUX_CONTEXT_OPTION_DECL},
  42   {"mode", required_argument, NULL, 'm'},
  43   {"parents", no_argument, NULL, 'p'},
  44   {"verbose", no_argument, NULL, 'v'},
  45   {GETOPT_HELP_OPTION_DECL},
  46   {GETOPT_VERSION_OPTION_DECL},
  47   {NULL, 0, NULL, 0}
  48 };
  49
  50 void
  51 usage (int status)
  52 {
  53   if (status != EXIT_SUCCESS)
  54     emit_try_help ();
  55   else
  56     {
  57       printf (_("Usage: %s [OPTION]... DIRECTORY...\n"), program_name);
  58       fputs (_("\
  59 Create the DIRECTORY(ies), if they do not already exist.\n\
  60 "), stdout);
  61
  62       emit_mandatory_arg_note ();
  63
  64       fputs (_("\
  65   -m, --mode=MODE   set file mode (as in chmod), not a=rwx - umask\n\
  66   -p, --parents     no error if existing, make parent directories as needed\n\
  67   -v, --verbose     print a message for each created directory\n\
  68   -Z, --context=CTX  set the SELinux security context of each created\n\
  69                       directory to CTX\n\
  70 "), stdout);
  71       fputs (HELP_OPTION_DESCRIPTION, stdout);
  72       fputs (VERSION_OPTION_DESCRIPTION, stdout);
  73       emit_ancillary_info ();
  74     }
  75   exit (status);
  76 }
  77
  78 /* Options passed to subsidiary functions.  */
  79 struct mkdir_options
  80 {
  81   /* Function to make an ancestor, or NULL if ancestors should not be
  82      made.  */
  83   int (*make_ancestor_function) (char const *, char const *, void *);
  84
  85   /* Umask value in effect.  */
  86   mode_t umask_value;
  87
  88   /* Mode for directory itself.  */
  89   mode_t mode;
  90
  91   /* File mode bits affected by MODE.  */
  92   mode_t mode_bits;
  93
  94   /* If not null, format to use when reporting newly made directories.  */
  95   char const *created_directory_format;
  96 };
  97
  98 /* Report that directory DIR was made, if OPTIONS requests this.  */
  99 static void
 100 announce_mkdir (char const *dir, void *options)
 101 {
 102   struct mkdir_options const *o = options;
 103   if (o->created_directory_format)
 104     prog_fprintf (stdout, o->created_directory_format, quote (dir));
 105 }
 106
 107 /* Make ancestor directory DIR, whose last component is COMPONENT,
 108    with options OPTIONS.  Assume the working directory is COMPONENT's
 109    parent.  Return 0 if successful and the resulting directory is
 110    readable, 1 if successful but the resulting directory is not
 111    readable, -1 (setting errno) otherwise.  */
 112 static int
 113 make_ancestor (char const *dir, char const *component, void *options)
 114 {
 115   struct mkdir_options const *o = options;
 116   int r;
 117   mode_t user_wx = S_IWUSR | S_IXUSR;
 118   bool self_denying_umask = (o->umask_value & user_wx) != 0;
 119   if (self_denying_umask)
 120     umask (o->umask_value & ~user_wx);
 121   r = mkdir (component, S_IRWXUGO);
 122   if (self_denying_umask)
 123     {
 124       int mkdir_errno = errno;
 125       umask (o->umask_value);
 126       errno = mkdir_errno;
 127     }
 128   if (r == 0)
 129     {
 130       r = (o->umask_value & S_IRUSR) != 0;
 131       announce_mkdir (dir, options);
 132     }
 133   return r;
 134 }
 135
 136 /* Process a command-line file name.  */
 137 static int
 138 process_dir (char *dir, struct savewd *wd, void *options)
 139 {
 140   struct mkdir_options const *o = options;
 141   return (make_dir_parents (dir, wd, o->make_ancestor_function, options,
 142                             o->mode, announce_mkdir,
 143                             o->mode_bits, (uid_t) -1, (gid_t) -1, true)
 144           ? EXIT_SUCCESS
 145           : EXIT_FAILURE);
 146 }
 147
 148 int
 149 main (int argc, char **argv)
 150 {
 151   const char *specified_mode = NULL;
 152   int optc;
 153   security_context_t scontext = NULL;
 154   struct mkdir_options options;
 155
 156   options.make_ancestor_function = NULL;
 157   options.mode = S_IRWXUGO;
 158   options.mode_bits = 0;
 159   options.created_directory_format = NULL;
 160
 161   initialize_main (&argc, &argv);
 162   set_program_name (argv[0]);
 163   setlocale (LC_ALL, "");
 164   bindtextdomain (PACKAGE, LOCALEDIR);
 165   textdomain (PACKAGE);
 166
 167   atexit (close_stdout);
 168
 169   while ((optc = getopt_long (argc, argv, "pm:vZ:", longopts, NULL)) != -1)
 170     {
 171       switch (optc)
 172         {
 173         case 'p':
 174           options.make_ancestor_function = make_ancestor;
 175           break;
 176         case 'm':
 177           specified_mode = optarg;
 178           break;
 179         case 'v': /* --verbose  */
 180           options.created_directory_format = _("created directory %s");
 181           break;
 182         case 'Z':
 183           scontext = optarg;
 184           break;
 185         case_GETOPT_HELP_CHAR;
 186         case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
 187         default:
 188           usage (EXIT_FAILURE);
 189         }
 190     }
 191
 192   if (optind == argc)
 193     {
 194       error (0, 0, _("missing operand"));
 195       usage (EXIT_FAILURE);
 196     }
 197
 198   if (scontext)
 199     {
 200       int ret = 0;
 201       if (is_smack_enabled ())
 202         ret = smack_set_label_for_self (scontext);
 203       else
 204         ret = setfscreatecon (scontext);
 205
 206       if (ret < 0)
 207         error (EXIT_FAILURE, errno,
 208                _("failed to set default file creation context to %s"),
 209                quote (scontext));
 210     }
 211
 212
 213   if (options.make_ancestor_function || specified_mode)
 214     {
 215       mode_t umask_value = umask (0);
 216       umask (umask_value);
 217       options.umask_value = umask_value;
 218
 219       if (specified_mode)
 220         {
 221           struct mode_change *change = mode_compile (specified_mode);
 222           if (!change)
 223             error (EXIT_FAILURE, 0, _("invalid mode %s"),
 224                    quote (specified_mode));
 225           options.mode = mode_adjust (S_IRWXUGO, true, umask_value, change,
 226                                       &options.mode_bits);
 227           free (change);
 228         }
 229       else
 230         options.mode = S_IRWXUGO;
 231     }
 232
 233   exit (savewd_process_files (argc - optind, argv + optind,
 234                               process_dir, &options));
 235 }