74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
/*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* Copyright (C) 2000 Werner Almesberger
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*/
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#include <err.h>
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#include <errno.h>
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#include <getopt.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/syscall.h>
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#include <unistd.h>
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#include "c.h"
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#include "nls.h"
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#include "closestream.h"
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#define pivot_root(new_root,put_old) syscall(SYS_pivot_root,new_root,put_old)
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static void __attribute__((__noreturn__)) usage(void)
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{
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FILE *out = stdout;
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fputs(USAGE_HEADER, out);
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fprintf(out, _(" %s [options] new_root put_old\n"),
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program_invocation_short_name);
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fputs(USAGE_SEPARATOR, out);
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fputs(_("Change the root filesystem.\n"), out);
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fputs(USAGE_OPTIONS, out);
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fprintf(out, USAGE_HELP_OPTIONS(16));
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fprintf(out, USAGE_MAN_TAIL("pivot_root(8)"));
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exit(EXIT_SUCCESS);
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}
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int main(int argc, char **argv)
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{
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int ch;
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static const struct option longopts[] = {
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{"version", no_argument, NULL, 'V'},
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{"help", no_argument, NULL, 'h'},
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{NULL, 0, NULL, 0}
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};
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setlocale(LC_ALL, "");
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bindtextdomain(PACKAGE, LOCALEDIR);
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textdomain(PACKAGE);
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close_stdout_atexit();
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while ((ch = getopt_long(argc, argv, "Vh", longopts, NULL)) != -1)
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switch (ch) {
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case 'V':
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print_version(EXIT_SUCCESS);
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case 'h':
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usage();
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default:
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errtryhelp(EXIT_FAILURE);
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}
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if (argc != 3) {
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warnx(_("bad usage"));
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errtryhelp(EXIT_FAILURE);
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}
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if (pivot_root(argv[1], argv[2]) < 0)
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err(EXIT_FAILURE, _("failed to change root from `%s' to `%s'"),
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argv[1], argv[2]);
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return EXIT_SUCCESS;
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}
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