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/* © 2008 sqweek <sqweek@gmail.com>
* See COPYING for details.
*/
#include <err.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/mount.h>
int
main(int argc, char **argv)
{
char *old = NULL, *new = NULL;
struct stat stbuf;
while (*++argv) {
if (!old) {
old = *argv;
} else if (!new) {
new = *argv;
} else {
errx(1, "%s: too many arguments", *argv);
}
}
if (!old || !new) {
errx(1, "usage: 9bind old new");
}
/* Make sure mount exists, is writable, and not sticky */
if (stat(new, &stbuf) || access(new, W_OK)) {
err(1, "%s", new);
}
if (stbuf.st_mode & S_ISVTX) {
errx(1, "%s: refusing to bind over sticky directory", new);
}
if (mount(old, new, NULL, MS_BIND, NULL)) {
err(1, "mount");
}
return 0;
}
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