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# Copyright 2007 Roy Marples
# All rights reserved
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
# 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() {
type fuser >/dev/null 2>&1 || return 0
local cmd="$1" retval=0 retry=
local f_opts="-m -c" f_kill="-s " mnt=
if [ "${RC_UNAME}" = "Linux" ]; then
f_opts="-m"
f_kill="-"
fi
shift
mountinfo "$@" | while read mnt; do
case "${cmd}" in
umount*)
# If we're using the mount (probably /usr) then don't unmount us
local pids="$(fuser ${f_opts} "${mnt}" 2>/dev/null)"
case " ${pids} " in
*" $$ "*)
ewarn "We are using ${mnt}, not unmounting"
continue
;;
esac
ebegin "Unmounting ${mnt}"
;;
*)
ebegin "Remounting ${mnt}"
;;
esac
retry=3
while ! LC_ALL=C ${cmd} "${mnt}" 2>/dev/null; do
# Don't kill if it's us (/ and possibly /usr)
local pids="$(fuser ${f_opts} "${mnt}" 2>/dev/null)"
case " ${pids} " in
*" $$ "*) 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}
}
# vim: set ts=4 :
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