88 lines
2.2 KiB
Bash
88 lines
2.2 KiB
Bash
# Copyright (c) 2007-2015 The OpenRC Authors.
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# See the Authors file at the top-level directory of this distribution and
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# https://github.com/OpenRC/openrc/blob/HEAD/AUTHORS
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#
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# This file is part of OpenRC. It is subject to the license terms in
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# the LICENSE file found in the top-level directory of this
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# distribution and at https://github.com/OpenRC/openrc/blob/HEAD/LICENSE
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# This file may not be copied, modified, propagated, or distributed
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# except according to the terms contained in the LICENSE file.
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# Declare this here so that no formatting doesn't affect the embedded newline
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__IFS="
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"
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# Handy function to handle all our unmounting needs
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# mountinfo is a C program to actually find our mounts on our supported OS's
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# We rely on fuser being present, so if it's not then don't unmount anything.
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# This isn't a real issue for the BSD's, but it is for Linux.
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do_unmount()
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{
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local cmd="$1" retval=0 retry= pids=-
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local f_opts="-m -c" f_kill="-s " mnt=
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if [ "$RC_UNAME" = "Linux" ]; then
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f_opts="-m"
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f_kill="-"
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fi
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shift
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local IFS="$__IFS"
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set -- $(mountinfo "$@")
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unset IFS
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for mnt; do
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# Unmounting a shared mount can unmount other mounts, so
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# we need to check the mount is still valid
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mountinfo --quiet "$mnt" || continue
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# Ensure we interpret all characters properly.
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mnt=$(printf "$mnt")
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case "$cmd" in
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umount)
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ebegin "Unmounting $mnt"
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;;
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*)
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ebegin "Remounting $mnt read only"
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;;
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esac
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retry=4 # Effectively TERM, sleep 1, TERM, sleep 1, KILL, sleep 1
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while ! LC_ALL=C $cmd "$mnt" 2>/dev/null; do
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if command -v fuser >/dev/null 2>&1; then
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pids="$(timeout -s KILL "${rc_fuser_timeout:-60}" \
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fuser $f_opts "$mnt" 2>/dev/null)"
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fi
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case " $pids " in
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*" $$ "*)
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eend 1 "failed because we are using" \
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"$mnt"
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retry=0;;
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" - ")
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eend 1
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retry=0;;
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" ")
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eend 1 "in use but fuser finds nothing"
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retry=0;;
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*)
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if [ $retry -le 0 ]; then
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eend 1
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else
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local sig="TERM"
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: $(( retry -= 1 ))
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[ $retry = 1 ] && sig="KILL"
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fuser $f_kill$sig -k $f_opts \
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"$mnt" >/dev/null 2>&1
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sleep 1
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fi
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;;
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esac
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[ $retry -le 0 ] && break
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done
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if [ $retry -le 0 ]; then
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retval=1
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else
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eend 0
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fi
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done
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return $retval
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}
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