80 lines
1.8 KiB
Bash
80 lines
1.8 KiB
Bash
# Copyright (c) 2007-2009 Roy Marples <roy@marples.name>
|
|
# All rights reserved. Released under the 2-clause BSD license.
|
|
|
|
# Declare this here so that no formatting doesn't affect the embedded newline
|
|
__IFS="
|
|
"
|
|
|
|
# Handy function to handle all our unmounting needs
|
|
# mountinfo is a C program to actually find our mounts on our supported OS's
|
|
# We rely on fuser being present, so if it's not then don't unmount anything.
|
|
# This isn't a real issue for the BSD's, but it is for Linux.
|
|
do_unmount()
|
|
{
|
|
local cmd="$1" retval=0 retry= pids=-
|
|
local f_opts="-m -c" f_kill="-s " mnt=
|
|
if [ "$RC_UNAME" = "Linux" ]; then
|
|
f_opts="-m"
|
|
f_kill="-"
|
|
fi
|
|
|
|
shift
|
|
local IFS="$__IFS"
|
|
set -- $(mountinfo "$@")
|
|
unset IFS
|
|
for mnt; do
|
|
# Unmounting a shared mount can unmount other mounts, so
|
|
# we need to check the mount is still valid
|
|
mountinfo --quiet "$mnt" || continue
|
|
# Ensure we interpret all characters properly.
|
|
mnt=$(printf "$mnt")
|
|
|
|
case "$cmd" in
|
|
umount)
|
|
ebegin "Unmounting $mnt"
|
|
;;
|
|
*)
|
|
ebegin "Remounting $mnt read only"
|
|
;;
|
|
esac
|
|
|
|
retry=4 # Effectively TERM, sleep 1, TERM, sleep 1, KILL, sleep 1
|
|
while ! LC_ALL=C $cmd "$mnt" 2>/dev/null; do
|
|
if type fuser >/dev/null 2>&1; then
|
|
pids="$(fuser $f_opts "$mnt" 2>/dev/null)"
|
|
fi
|
|
case " $pids " in
|
|
*" $$ "*)
|
|
eend 1 "failed because we are using" \
|
|
"$mnt"
|
|
retry=0;;
|
|
" - ")
|
|
eend 1
|
|
retry=0;;
|
|
" ")
|
|
eend 1 "in use but fuser finds nothing"
|
|
retry=0;;
|
|
*)
|
|
if [ $retry -le 0 ]; then
|
|
eend 1
|
|
else
|
|
local sig="TERM"
|
|
retry=$(($retry - 1))
|
|
[ $retry = 1 ] && sig="KILL"
|
|
fuser $f_kill$sig -k $f_opts \
|
|
"$mnt" >/dev/null 2>&1
|
|
sleep 1
|
|
fi
|
|
;;
|
|
esac
|
|
[ $retry -le 0 ] && break
|
|
done
|
|
if [ $retry -le 0 ]; then
|
|
retval=1
|
|
else
|
|
eend 0
|
|
fi
|
|
done
|
|
return $retval
|
|
}
|