sbase/chroot.c

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/* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include "util.h"
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static void
usage(void)
{
eprintf("usage: chroot dir [command [arg...]]\n");
}
int
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main(int argc, char *argv[])
{
char *shell[] = { "/bin/sh", "-i", NULL }, *aux, *p;
int savederrno;
ARGBEGIN {
default:
usage();
} ARGEND;
if(argc < 1)
usage();
if((aux = getenv("SHELL")))
shell[0] = aux;
if(chroot(argv[0]) == -1)
eprintf("chroot %s:", argv[0]);
if(chdir("/") == -1)
eprintf("chdir:");
if(argc == 1) {
p = *shell;
execvp(*shell, shell);
} else {
p = argv[1];
execvp(argv[1], argv+1);
}
savederrno = errno;
weprintf("execvp %s:", p);
_exit(savederrno == ENOENT ? 127 : 126);
}