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/* ISC license. */
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <mntent.h>
#include <sys/mount.h>
#include <skalibs/strerr.h>
#include <skalibs/stralloc.h>
#include <skalibs/skamisc.h>
#include <s6-linux-init/config.h>
#define MAXLINES 99
#define EXCLUDEN 3
static char const *exclude_type[EXCLUDEN] = { "devtmpfs", "proc", "sysfs" } ;
int main (int argc, char const *const *argv)
{
size_t mountpoints[MAXLINES] ;
unsigned int got[EXCLUDEN] = { 0, 0, 0 } ;
stralloc sa = STRALLOC_ZERO ;
unsigned int line = 0 ;
int e = 0 ;
FILE *fp = setmntent("/proc/mounts", "r") ;
PROG = "s6-linux-init-umountall" ;
if (!fp) strerr_diefu1sys(111, "open /proc/mounts") ;
for (;;)
{
struct mntent *p ;
unsigned int i = 0 ;
errno = 0 ;
p = getmntent(fp) ;
if (!p) break ;
if (!strcmp(p->mnt_dir, S6_LINUX_INIT_TMPFS)) continue ;
for (; i < EXCLUDEN ; i++)
if (!strcmp(p->mnt_type, exclude_type[i]))
{
got[i]++ ;
break ;
}
if (i < EXCLUDEN && got[i] == 1) continue ;
if (line >= MAXLINES)
strerr_dief1x(100, "too many mount points") ;
mountpoints[line++] = sa.len ;
if (!stralloc_cats(&sa, p->mnt_dir) || !stralloc_0(&sa))
strerr_diefu1sys(111, "add mount point to list") ;
}
if (errno) strerr_diefu1sys(111, "read /proc/mounts") ;
endmntent(fp) ;
while (line--)
if (umount(sa.s + mountpoints[line]) == -1)
{
if (errno == EBUSY)
{
if (mount(0, sa.s + mountpoints[line], 0, MS_REMOUNT | MS_RDONLY, 0) == -1)
{
e++ ;
strerr_warnwusys("read-only remount ", sa.s + mountpoints[line]) ;
}
}
else
{
e++ ;
strerr_warnwu2sys("umount ", sa.s + mountpoints[line]) ;
}
}
stralloc_free(&sa) ;
return e ;
}
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