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#! /bin/sh ### BEGIN INIT INFO # Provides: umountroot # Required-Start: # Required-Stop: # Should-Stop: halt reboot kexec # Default-Start: # Default-Stop: 0 6 # Short-Description: Mount the root filesystem read-only. ### END INIT INFO PATH=/sbin:/bin . /lib/init/vars.sh . /lib/lsb/init-functions do_stop () { [ "$VERBOSE" = no ] || log_action_begin_msg "Mounting root filesystem read-only" # Ask init to re-exec itself before we go down if it has been # upgraded this cycle. It'll lose all its state, but at least # it won't hold open files on the root filesystem (lp:#672177). if [ -f /var/run/init.upgraded ] then old_map=$( cat /proc/1/maps ) map=$old_map telinit u || : i=0 timeout=5 while [ "$map" = "$old_map" ] do sleep 1 map=$( cat /proc/1/maps ) /usr/bin/logger "waiting for init to respawn" i=$((i+1)) if [ $i -eq $timeout ] ; then break fi done if [ "$map" = "$old_map" ] ; then /usr/bin/logger "FAIL: init failed to respawn in $timeout seconds - unmounting anyway" else /usr/bin/logger "SUCCESS: init respawned after $i seconds (within $timeout seconds timeout)" fi fi MOUNT_FORCE_OPT= [ "$(uname -s)" = "GNU/kFreeBSD" ] && MOUNT_FORCE_OPT=-f # This: # mount -n -o remount,ro / # will act on a bind mount of / if there is one. # See #339023 and the comment in checkroot.sh mount $MOUNT_FORCE_OPT -n -o remount,ro -t dummytype dummydev / 2>/dev/null \ || mount $MOUNT_FORCE_OPT -n -o remount,ro dummydev / 2>/dev/null \ || mount $MOUNT_FORCE_OPT -n -o remount,ro / ES=$? [ "$VERBOSE" = no ] || log_action_end_msg $ES } case "$1" in start) # No-op ;; restart|reload|force-reload) echo "Error: argument '$1' not supported" >&2 exit 3 ;; stop) do_stop ;; *) echo "Usage: $0 start|stop" >&2 exit 3 ;; esac :