All patches and comments are welcome. Please squash your changes to logical
commits before using git-format-patch and git-send-email to
patches@git.madduck.net.
If you'd read over the Git project's submission guidelines and adhered to them,
I'd be especially grateful.
3 # shutdown -- wrapper script to prevent erroneous shutdowns via SSH
5 # Copyright © martin f. krafft <madduck@madduck.net>
6 # Released under the terms of the Artistic Licence 2.0
8 # $Id: shutdown 299 2006-10-16 14:40:47Z madduck $
18 halt|reboot|shutdown|poweroff)
19 if [ ! -f $EXEC ]; then
20 echo "E: $ME: not a regular file: $EXEC" >&2
23 if [ ! -x $EXEC ]; then
24 echo "E: $ME: not an executable: $EXEC" >&2
29 echo "E: $ME: unsupported command: $CMD" >&2
40 Instead of invoking $EXEC directly, $ME will prompt the user for the
41 machine's hostname to guard against accidental shutdowns/reboots, if the
42 current shell is a child of an SSH connection (or --pretend-ssh) has been
43 given on the command line, if the shell is connected to an interactive
44 terminal, and the actual command to execute is does not involve --help or is
47 Only if the user enters the machine's hostname correctly will $ME take
48 action. Specifying --molly-guard-do-nothing as argument to the command will
49 make $ME echo the command it would execute rather than actually executing
52 The actual command's help output follows:
62 (*-molly-guard-do-nothing) DO_NOTHING=1;;
65 eval $EXEC --help 2>&1
68 (*-pretend-ssh) PRETEND_SSH=1;;
69 *) ARGS="${ARGS:+$ARGS }$arg";;
75 if [ $DO_NOTHING -eq 1 ]; then
76 echo "$ME: would run: $EXEC $ARGS"
79 eval exec $EXEC "$ARGS"
83 if [ $DO_NOTHING -eq 1 ]; then
84 echo "I: demo mode; $ME will not do anything due to --molly-guard-do-nothing."
87 # require an interactive terminal connected to stdin
88 test -t 0 || do_real_cmd
90 # only run if we are being called over SSH, that is if the current terminal
91 # was created by sshd.
92 PTS=$(readlink /proc/$$/fd/0)
93 if ! pgrep -f "^sshd.+${PTS#/dev/}[[:space:]]*$" >/dev/null \
94 && [ -z "$SSH_CONNECTION" ]; then
95 if [ $PRETEND_SSH -eq 1 ]; then
96 echo "I: this is not an SSH session, but --pretend-ssh was given..."
101 echo "W: $ME: SSH session detected!"
104 # pass through certain commands
107 echo "I: executing $CMD $ARGS regardless of SSH session."
112 HOSTNAME="$(hostname --short)"
116 echo "Good thing I asked; I won't $CMD $HOSTNAME ..."
120 trap 'echo;sigh' 1 2 3 9 10 12 15
122 echo -n "Please type in hostname of the machine to $CMD: "
123 read HOSTNAME_USER || :
125 [ "$HOSTNAME_USER" = "$HOSTNAME" ] || sigh
127 trap - 1 2 3 9 10 12 15