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Annotation of 43BSDReno/usr.sbin/chroot/chroot.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1988 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted provided
        !             6:  * that: (1) source distributions retain this entire copyright notice and
        !             7:  * comment, and (2) distributions including binaries display the following
        !             8:  * acknowledgement:  ``This product includes software developed by the
        !             9:  * University of California, Berkeley and its contributors'' in the
        !            10:  * documentation or other materials provided with the distribution and in
        !            11:  * all advertising materials mentioning features or use of this software.
        !            12:  * Neither the name of the University nor the names of its contributors may
        !            13:  * be used to endorse or promote products derived from this software without
        !            14:  * specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            16:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            17:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #ifndef lint
        !            21: char copyright[] =
        !            22: "@(#) Copyright (c) 1988 The Regents of the University of California.\n\
        !            23:  All rights reserved.\n";
        !            24: #endif /* not lint */
        !            25: 
        !            26: #ifndef lint
        !            27: static char sccsid[] = "@(#)chroot.c   5.8 (Berkeley) 6/1/90";
        !            28: #endif /* not lint */
        !            29: 
        !            30: #include <stdio.h>
        !            31: #include <paths.h>
        !            32: 
        !            33: main(argc, argv)
        !            34:        int argc;
        !            35:        char **argv;
        !            36: {
        !            37:        extern int errno;
        !            38:        char *shell, *getenv(), *strerror();
        !            39: 
        !            40:        if (argc < 2) {
        !            41:                (void)fprintf(stderr, "usage: chroot newroot [command]\n");
        !            42:                exit(1);
        !            43:        }
        !            44:        if (chdir(argv[1]) || chroot("."))
        !            45:                fatal(argv[1]);
        !            46:        if (argv[2]) {
        !            47:                execvp(argv[2], &argv[2]);
        !            48:                fatal(argv[2]);
        !            49:        } else {
        !            50:                if (!(shell = getenv("SHELL")))
        !            51:                        shell = _PATH_BSHELL;
        !            52:                execlp(shell, shell, "-i", (char *)NULL);
        !            53:                fatal(shell);
        !            54:        }
        !            55:        /* NOTREACHED */
        !            56: }
        !            57: 
        !            58: fatal(msg)
        !            59:        char *msg;
        !            60: {
        !            61:        extern int errno;
        !            62: 
        !            63:        (void)fprintf(stderr, "chroot: %s: %s\n", msg, strerror(errno));
        !            64:        exit(1);
        !            65: }

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