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Diffstat (limited to 'src/chroot.c')
-rw-r--r-- | src/chroot.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/src/chroot.c b/src/chroot.c new file mode 100644 index 0000000..d2ae0e5 --- /dev/null +++ b/src/chroot.c @@ -0,0 +1,118 @@ +/* chroot -- run command or shell with special root directory + Copyright (C) 95, 96, 1997, 1999-2004 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software Foundation, + Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ + +/* Written by Roland McGrath. */ + +#include <config.h> +#include <getopt.h> +#include <stdio.h> +#include <sys/types.h> + +#include "system.h" +#include "error.h" +#include "long-options.h" +#include "quote.h" + +/* The official name of this program (e.g., no `g' prefix). */ +#define PROGRAM_NAME "chroot" + +#define AUTHORS "Roland McGrath" + +/* The name this program was run with, for error messages. */ +char *program_name; + +void +usage (int status) +{ + if (status != EXIT_SUCCESS) + fprintf (stderr, _("Try `%s --help' for more information.\n"), + program_name); + else + { + printf (_("\ +Usage: %s NEWROOT [COMMAND...]\n\ + or: %s OPTION\n\ +"), program_name, program_name); + fputs (_("\ +Run COMMAND with root directory set to NEWROOT.\n\ +\n\ +"), stdout); + fputs (HELP_OPTION_DESCRIPTION, stdout); + fputs (VERSION_OPTION_DESCRIPTION, stdout); + fputs (_("\ +\n\ +If no command is given, run ``${SHELL} -i'' (default: /bin/sh).\n\ +"), stdout); + printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT); + } + exit (status); +} + +int +main (int argc, char **argv) +{ + initialize_main (&argc, &argv); + program_name = argv[0]; + setlocale (LC_ALL, ""); + bindtextdomain (PACKAGE, LOCALEDIR); + textdomain (PACKAGE); + + initialize_exit_failure (EXIT_FAIL); + atexit (close_stdout); + + parse_long_options (argc, argv, PROGRAM_NAME, GNU_PACKAGE, VERSION, + usage, AUTHORS, (char const *) NULL); + if (getopt_long (argc, argv, "+", NULL, NULL) != -1) + usage (EXIT_FAIL); + + if (argc <= optind) + { + error (0, 0, _("missing operand")); + usage (EXIT_FAIL); + } + + if (chroot (argv[optind]) != 0) + error (EXIT_FAIL, errno, _("cannot change root directory to %s"), argv[1]); + + if (chdir ("/")) + error (EXIT_FAIL, errno, _("cannot chdir to root directory")); + + if (argc == optind + 1) + { + /* No command. Run an interactive shell. */ + char *shell = getenv ("SHELL"); + if (shell == NULL) + shell = "/bin/sh"; + argv[0] = shell; + argv[1] = "-i"; + argv[2] = NULL; + } + else + { + /* The following arguments give the command. */ + argv += optind + 1; + } + + /* Execute the given command. */ + execvp (argv[0], argv); + + { + int exit_status = (errno == ENOENT ? EXIT_ENOENT : EXIT_CANNOT_INVOKE); + error (0, errno, _("cannot run command %s"), quote (argv[0])); + exit (exit_status); + } +} |