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);
+  }
+}