]> git.madduck.net Git - code/molly-guard.git/blobdiff - shutdown

madduck's git repository

Every one of the projects in this repository is available at the canonical URL git://git.madduck.net/madduck/pub/<projectpath> — see each project's metadata for the exact URL.

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.

SSH access, as well as push access can be individually arranged.

If you use my repositories frequently, consider adding the following snippet to ~/.gitconfig and using the third clone URL listed for each project:

[url "git://git.madduck.net/madduck/"]
  insteadOf = madduck:

do not fail if called noninteractively
[code/molly-guard.git] / shutdown
index c68b57254297888114a1bea7792e480ae9890774..be733b71ac4c0fc771e89642ba82a6b06a7d3605 100755 (executable)
--- a/shutdown
+++ b/shutdown
@@ -1,15 +1,16 @@
 #!/bin/sh
 #
-# shutdown -- wrapper script to prevent erroneous shutdowns via SSH
+# 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
 #
-# $Id: shutdown 299 2006-10-16 14:40:47Z madduck $
-#
 set -eu
 
 ME=molly-guard
+VERSION=0.4
+SCRIPTSDIR=/etc/molly-guard/run.d
+SCRIPTSDIR="${0%/*}/run.d"
 
 CMD="${0##*/}"
 EXEC="/sbin/$CMD"
@@ -34,32 +35,31 @@ esac
 usage()
 {
   cat <<-_eousage
-       Usage: $ME [options]
+       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.
 
-       Instead of invoking $EXEC directly, $ME will run a number of checks
-        to guard against accidental shutdowns/reboots.
+       Specifying --molly-guard-do-nothing as argument to the command will
+       make $ME echo the command it would execute rather than actually
+       executing it.
 
-        Some of the checks available are:
-         - Prompt the user for the machine's if the current shell is a child
-           of an SSH connection (or --pretend-ssh) has been given on the
-           command line, if the shell is connected to an interactive
-          terminal, and the actual command to execute is does not involve
-           --help or is \`shutdown -c'.
+       Options following the double hyphen will be passed unchanged to the
+       scripts.
 
-       Only if the user satisfies all the checks will $ME take action.
-       Specifying --molly-guard-do-nothing as argument to the command will
-       make $ME echo the command it would execute rather than actually executing
-       it.
+       Please see molly-guard(8) for more information.
 
        The actual command's help output follows:
 
        _eousage
 }
 
-ARGS=
+CMDARGS=
+SCRIPTARGS=
+END_OF_ARGS=0
 DO_NOTHING=0
-CHECK_ARGS=
 for arg in "$@"; do
   case "$arg" in
     (*-molly-guard-do-nothing) DO_NOTHING=1;;
@@ -68,18 +68,24 @@ for arg in "$@"; do
       eval $EXEC --help 2>&1
       exit 0
       ;;
-    (*-pretend-ssh) CHECK_ARGS="${CHECK_ARGS:+$CHECK_ARGS }--arg --pretend-ssh";;
-    *) ARGS="${ARGS:+$ARGS }$arg";;
+    --) END_OF_ARGS=1;;
+    *) 
+      if [ $END_OF_ARGS -eq 0 ]; then
+        CMDARGS="${args:+$args }$arg"
+      else
+        SCRIPTARGS="${args:+$args }--arg $arg"
+      fi
+      ;;
   esac
 done
 
 do_real_cmd()
 {
   if [ $DO_NOTHING -eq 1 ]; then
-    echo "$ME: would run: $EXEC $ARGS"
+    echo "$ME: would run: $EXEC $CMDARGS"
     exit 0
   else
-    eval exec $EXEC "$ARGS"
+    eval exec $EXEC "$CMDARGS"
   fi
 }
 
@@ -88,17 +94,25 @@ if [ $DO_NOTHING -eq 1 ]; then
 fi
 
 # pass through certain commands
-case "$CMD $ARGS" in
-  (*shutdown\ *-c*) 
-    echo "I: executing $CMD $ARGS regardless of check results."
+case "$CMD $CMDARGS" in
+  (*shutdown\ *-c*)
+    # allow canceling shutdowns
+    echo "I: executing $CMD $CMDARGS regardless of check results."
     do_real_cmd
     ;;
 esac
 
-run-parts --exit-on-error $CHECK_ARGS /usr/share/molly-guard/checks.d
+MOLLYGUARD_CMD=$CMD; export MOLLYGUARD_CMD
+MOLLYGUARD_DO_NOTHING=$DO_NOTHING; export MOLLYGUARD_DO_NOTHING
+MOLLYGUARD_SETTINGS="/etc/default/$ME"; export MOLLYGUARD_SETTINGS
 
-# run-parts won't return to us if there are failures, but I'm paranoid.
-if [ $? == 0 ]; then
-  do_real_cmd
-  exit
-fi
+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."
+    exit $ret
+  fi
+done
+
+do_real_cmd