75 lines
1.7 KiB
Bash
75 lines
1.7 KiB
Bash
# Copyright 2007-2008 Roy Marples <roy@marples.name>
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# All rights reserved. Released under the 2-clause BSD license.
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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 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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{
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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 "${mnt}" || continue
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case "${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}"
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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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if type fuser >/dev/null 2>&1; then
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pids="$(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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local sig="KILL"
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[ ${retry} -gt 0 ] && sig="TERM"
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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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retry=$((${retry} - 1))
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[ ${retry} -le 0 ] && eend 1
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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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