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# Copyright 2007-2008 Roy Marples <roy@marples.name>
# All rights reserved. Released under the 2-clause BSD license.
# 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 preset, so if it's not then we 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
mountinfo "$@" | while read mnt; do
# Unmounting a shared mount can unmount other mounts, so
# we need to check the mount is still valid
mountinfo --quiet "${mnt}" || continue
case "${cmd}" in
umount*)
ebegin "Unmounting ${mnt}"
;;
*)
ebegin "Remounting ${mnt}"
;;
esac
retry=3
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;;
*)
local sig="KILL"
[ ${retry} -gt 0 ] && sig="TERM"
fuser ${f_kill}${sig} -k ${f_opts} \
"${mnt}" >/dev/null 2>&1
sleep 1
retry=$((${retry} - 1))
;;
esac
# OK, try forcing things
if [ ${retry} -le 0 ]; then
case "${cmd}" in
umount*)
LC_ALL=C ${cmd} -f "${mnt}" \
|| retry=-999
;;
*)
retry=-999
;;
esac
break
fi
done
if [ ${retry} -eq -999 ]; then
eend 1
retval=1
else
eend 0
fi
done
return ${retval}
}
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