LCOV - code coverage report
Current view: top level - src - chroot.c (source / functions) Hit Total Coverage
Test: coreutils.info Lines: 23 37 62.2 %
Date: 2018-01-30 Functions: 2 2 100.0 %

          Line data    Source code
       1             : /* chroot -- run command or shell with special root directory
       2             :    Copyright (C) 95, 96, 1997, 1999-2004, 2007 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             : /* Written by Roland McGrath.  */
      18             : 
      19             : #include <config.h>
      20             : #include <getopt.h>
      21             : #include <stdio.h>
      22             : #include <sys/types.h>
      23             : 
      24             : #include "system.h"
      25             : #include "error.h"
      26             : #include "long-options.h"
      27             : #include "quote.h"
      28             : 
      29             : /* The official name of this program (e.g., no `g' prefix).  */
      30             : #define PROGRAM_NAME "chroot"
      31             : 
      32             : #define AUTHORS "Roland McGrath"
      33             : 
      34             : /* The name this program was run with, for error messages. */
      35             : char *program_name;
      36             : 
      37             : void
      38          10 : usage (int status)
      39             : {
      40          10 :   if (status != EXIT_SUCCESS)
      41           8 :     fprintf (stderr, _("Try `%s --help' for more information.\n"),
      42             :              program_name);
      43             :   else
      44             :     {
      45           2 :       printf (_("\
      46             : Usage: %s NEWROOT [COMMAND...]\n\
      47             :   or:  %s OPTION\n\
      48             : "), program_name, program_name);
      49           2 :       fputs (_("\
      50             : Run COMMAND with root directory set to NEWROOT.\n\
      51             : \n\
      52             : "), stdout);
      53           2 :       fputs (HELP_OPTION_DESCRIPTION, stdout);
      54           2 :       fputs (VERSION_OPTION_DESCRIPTION, stdout);
      55           2 :       fputs (_("\
      56             : \n\
      57             : If no command is given, run ``${SHELL} -i'' (default: /bin/sh).\n\
      58             : "), stdout);
      59           2 :       emit_bug_reporting_address ();
      60             :     }
      61          10 :   exit (status);
      62             : }
      63             : 
      64             : int
      65          37 : main (int argc, char **argv)
      66             : {
      67             :   initialize_main (&argc, &argv);
      68          37 :   program_name = argv[0];
      69          37 :   setlocale (LC_ALL, "");
      70             :   bindtextdomain (PACKAGE, LOCALEDIR);
      71             :   textdomain (PACKAGE);
      72             : 
      73          37 :   initialize_exit_failure (EXIT_FAILURE);
      74          37 :   atexit (close_stdout);
      75             : 
      76          37 :   parse_long_options (argc, argv, PROGRAM_NAME, PACKAGE_NAME, VERSION,
      77             :                       usage, AUTHORS, (char const *) NULL);
      78          34 :   if (getopt_long (argc, argv, "+", NULL, NULL) != -1)
      79           6 :     usage (EXIT_FAILURE);
      80             : 
      81          28 :   if (argc <= optind)
      82             :     {
      83           2 :       error (0, 0, _("missing operand"));
      84           2 :       usage (EXIT_FAILURE);
      85             :     }
      86             : 
      87          26 :   if (chroot (argv[optind]) != 0)
      88          26 :     error (EXIT_FAILURE, errno, _("cannot change root directory to %s"), argv[1]);
      89             : 
      90           0 :   if (chdir ("/"))
      91           0 :     error (EXIT_FAILURE, errno, _("cannot chdir to root directory"));
      92             : 
      93           0 :   if (argc == optind + 1)
      94             :     {
      95             :       /* No command.  Run an interactive shell.  */
      96           0 :       char *shell = getenv ("SHELL");
      97           0 :       if (shell == NULL)
      98           0 :         shell = "/bin/sh";
      99           0 :       argv[0] = shell;
     100           0 :       argv[1] = "-i";
     101           0 :       argv[2] = NULL;
     102             :     }
     103             :   else
     104             :     {
     105             :       /* The following arguments give the command.  */
     106           0 :       argv += optind + 1;
     107             :     }
     108             : 
     109             :   /* Execute the given command.  */
     110           0 :   execvp (argv[0], argv);
     111             : 
     112             :   {
     113           0 :     int exit_status = (errno == ENOENT ? EXIT_ENOENT : EXIT_CANNOT_INVOKE);
     114           0 :     error (0, errno, _("cannot run command %s"), quote (argv[0]));
     115           0 :     exit (exit_status);
     116             :   }
     117             : }

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