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|
#!/bin/sh
#
# shutdown -- wrapper script to guard against accidental shutdowns
#
# Copyright © martin f. krafft <madduck@madduck.net>
# Released under the terms of the Artistic Licence 2.0
#
set -eu
ME=molly-guard
VERSION=0.8
SCRIPTSDIR="@cfgdir@/run.d"
CMD="${0##*/}"
case "$CMD" in
halt|reboot|shutdown|poweroff|coldreboot|pm-hibernate|pm-suspend|pm-suspend-hybrid)
if ! EXEC=$(command -v "$CMD.no-molly-guard"); then
if ! EXEC=$(command -v "$CMD.no-molly-guard.usr-is-merged"); then
echo "E: not a regular file: $EXEC" >&2
exit 4
fi
fi
if [ "$EXEC" -ef /usr/lib/molly-guard/molly-guard ]; then
# Symlink forwards to ourselves. Resolve!
LINKTARGET=$(readlink "$EXEC")
if ! EXEC=$(command -v "$LINKTARGET.no-molly-guard"); then
if ! EXEC=$(command -v "$LINKTARGET.no-molly-guard.usr-is-merged"); then
echo "E: not a regular file $EXEC" >&2
exit 4
fi
fi
fi
if [ ! -x $EXEC ]; then
echo "E: not an executable: $EXEC" >&2
exit 3
fi
;;
*)
echo "E: unsupported command: $CMD" >&2
exit 1
;;
esac
usage()
{
cat <<-_eousage
Usage: $ME [options] [-- script options]
(shielding $EXEC)
molly-guard's primary goal is to guard against accidental
shutdowns/reboots. $ME will run all scripts in $SCRIPTSDIR and only
invokes $EXEC if all scripts exited successfully.
Specifying --molly-guard-do-nothing as argument to the command will
make $ME echo the command it would execute rather than actually
executing it.
Options following the double hyphen will be passed unchanged to the
scripts.
Please see molly-guard(8) for more information.
The actual command's help output follows:
_eousage
}
CMDARGS=
SCRIPTARGS=
END_OF_ARGS=0
DO_NOTHING=0
for arg in "$@"; do
case "$arg" in
(*-molly-guard-do-nothing) DO_NOTHING=1;;
(*-help)
usage 2>&1
( exec bash -c 'exec -a "$0" "$@"' "$CMD" "$EXEC" --help 2>&1 )
exit 0
;;
--) END_OF_ARGS=1;;
*\"*)
echo 'E: cannot use double-quotes (") in arguments' >&2
exit 1
;;
*)
if [ $END_OF_ARGS -eq 0 ]; then
CMDARGS="${CMDARGS:+$CMDARGS }\"$arg\""
else
SCRIPTARGS="${SCRIPTARGS:+$SCRIPTARGS }--arg \"$arg\""
fi
;;
esac
done
do_real_cmd()
{
if [ $DO_NOTHING -eq 1 ]; then
echo "$ME: would run: $EXEC $CMDARGS"
exit 0
else
eval exec bash -c "'"'exec -a "$0" "$@"'"'" "'$CMD'" "'$EXEC'" "$CMDARGS"
fi
}
if [ $DO_NOTHING -eq 1 ]; then
echo "I: demo mode; $ME will not do anything due to --molly-guard-do-nothing." >&2
fi
if [ -n "${MOLLYGUARD_CMD:-}" ]; then
do_real_cmd
fi
MOLLYGUARD_CMD=$CMD; export MOLLYGUARD_CMD
MOLLYGUARD_DO_NOTHING=$DO_NOTHING; export MOLLYGUARD_DO_NOTHING
MOLLYGUARD_SETTINGS="@cfgdir@/rc"; export MOLLYGUARD_SETTINGS
# pass through certain commands
case "$CMD $CMDARGS" in
(*shutdown\ *-c*|*halt\ *-w*|*halt\ *-f*|*reboot\ *-f*)
# allow canceling shutdowns, only write wtmp and force immediate halt
echo "I: executing $CMD $CMDARGS regardless of check results." >&2
do_real_cmd
;;
esac
# Check for execution from configuration management tools that might use an
# interactive shell.
CONFIGURATION_MANAGEMENT=0
[ -f "$MOLLYGUARD_SETTINGS" ] && . "$MOLLYGUARD_SETTINGS"
# Ansible uses an interactive shell, but by default puts Ansible in the
# broadcast message, we can look for that. Allow for it be changed per site.
ANSIBLE_SEARCH_STRING="${ANSIBLE_SEARCH_STRING:-ansible}"
if echo $CMDARGS | grep -qi $ANSIBLE_SEARCH_STRING; then
CONFIGURATION_MANAGEMENT=1
fi
export CONFIGURATION_MANAGEMENT
for script in $(run-parts --test $SCRIPTSDIR); do
ret=0
eval $script $SCRIPTARGS || ret=$?
if [ $ret -ne 0 ]; then
echo "W: aborting $CMD due to ${script##*/} exiting with code $ret." >&2
exit $ret
fi
done
do_real_cmd
|
