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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