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