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/* ISC license. */
#include <string.h>
#include <sys/mount.h>
#include <skalibs/bytestr.h>
#include <skalibs/buffer.h>
#include <skalibs/strerr.h>
#include <skalibs/stralloc.h>
#include <skalibs/djbunix.h>
#include <skalibs/skamisc.h>
#define USAGE "s6-umount mountpoint <or> s6-umount -a"
#define BUFSIZE 4096
#define MAXLINES 512
static int umountall ( )
{
stralloc mountpoints[MAXLINES] ;
char buf[BUFSIZE+1] ;
buffer b ;
stralloc sa = STRALLOC_ZERO ;
unsigned int line = 0 ;
int e = 0 ;
int r ;
int fd = open_readb("/proc/mounts") ;
if (fd < 0) strerr_diefu1sys(111, "open /proc/mounts") ;
memset(mountpoints, 0, sizeof(mountpoints)) ;
buffer_init(&b, &buffer_read, fd, buf, BUFSIZE+1) ;
for (;;)
{
size_t n, p ;
if (line >= MAXLINES) strerr_dief1x(111, "/proc/mounts too big") ;
sa.len = 0 ;
r = skagetln(&b, &sa, '\n') ;
if (r <= 0) break ;
p = byte_chr(sa.s, sa.len, ' ') ;
if (p >= sa.len) strerr_dief1x(111, "bad /proc/mounts format") ;
p++ ;
n = byte_chr(sa.s + p, sa.len - p, ' ') ;
if (n == sa.len - p) strerr_dief1x(111, "bad /proc/mounts format") ;
if (!stralloc_catb(&mountpoints[line], sa.s + p, n) || !stralloc_0(&mountpoints[line]))
strerr_diefu1sys(111, "store mount point") ;
line++ ;
}
fd_close(fd) ;
stralloc_free(&sa) ;
if (r < 0) strerr_diefu1sys(111, "read /proc/mounts") ;
while (line--)
if (umount(mountpoints[line].s) == -1)
{
e++ ;
strerr_warnwu2sys("umount ", mountpoints[line].s) ;
}
return e ;
}
int main (int argc, char const *const *argv)
{
PROG = "s6-umount" ;
if (argc < 2) strerr_dieusage(100, USAGE) ;
if ((argv[1][0] == '-') && (argv[1][1] == 'a') && !argv[1][2])
return umountall() ;
if (umount(argv[1]) == -1) strerr_diefu2sys(111, "umount ", argv[1]) ;
return 0 ;
}
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