# Copyright (c) 2007-2009 Roy Marples # Released under the 2-clause BSD license. # Declare this here so that no formatting doesn't affect the embedded newline __IFS=" " # 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 present, so if it's not then 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 local IFS="$__IFS" set -- $(mountinfo "$@") unset IFS for mnt; do # Unmounting a shared mount can unmount other mounts, so # we need to check the mount is still valid mountinfo --quiet "$mnt" || continue # Ensure we interpret all characters properly. mnt=$(printf "$mnt") case "$cmd" in umount) ebegin "Unmounting $mnt" ;; *) ebegin "Remounting $mnt read only" ;; esac retry=4 # Effectively TERM, sleep 1, TERM, sleep 1, KILL, sleep 1 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;; *) if [ $retry -le 0 ]; then eend 1 else local sig="TERM" : $(( retry -= 1 )) [ $retry = 1 ] && sig="KILL" fuser $f_kill$sig -k $f_opts \ "$mnt" >/dev/null 2>&1 sleep 1 fi ;; esac [ $retry -le 0 ] && break done if [ $retry -le 0 ]; then retval=1 else eend 0 fi done return $retval }