99 lines
2.9 KiB
Bash
99 lines
2.9 KiB
Bash
# Copyright 2007 Roy Marples
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# All rights reserved
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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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 preset, so if it's not then we 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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type fuser >/dev/null 2>&1 || return 0
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local cmd="$1" retval=0 retry=
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local f_opts="-m -c" f_kill="-s " mnt=
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if [ "${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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mountinfo "$@" | while read mnt; do
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case "${cmd}" in
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umount*)
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# If we're using the mount (probably /usr) then don't unmount us
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local pids="$(fuser ${f_opts} "${mnt}" 2>/dev/null)"
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case " ${pids} " in
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*" $$ "*)
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ewarn "We are using ${mnt}, not unmounting"
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continue
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;;
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esac
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ebegin "Unmounting ${mnt}"
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;;
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*)
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ebegin "Remounting ${mnt}"
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;;
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esac
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retry=3
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while ! LC_ALL=C ${cmd} "${mnt}" 2>/dev/null; do
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# Don't kill if it's us (/ and possibly /usr)
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local pids="$(fuser ${f_opts} "${mnt}" 2>/dev/null)"
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case " ${pids} " in
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*" $$ "*) retry=0;;
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" ") eend 1 "in use but fuser finds nothing"; retry=0;;
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*)
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local sig="KILL"
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[ ${retry} -gt 0 ] && sig="TERM"
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fuser ${f_kill}${sig} -k ${f_opts} "${mnt}" \
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>/dev/null 2>&1
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sleep 1
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retry=$((${retry} - 1))
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;;
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esac
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# OK, try forcing things
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if [ ${retry} -le 0 ]; then
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case "${cmd}" in
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umount*)
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LC_ALL=C ${cmd} -f "${mnt}" || retry=-999
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;;
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*)
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retry=-999
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;;
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esac
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break
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fi
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done
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if [ ${retry} -eq -999 ]; then
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eend 1
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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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# vim: set ts=4 :
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