]> 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:

rework the scripts given andrew's patch
[code/molly-guard.git] / shutdown
index 8beaa50558358eb6e7a5e021399fde0ff8309a7c..be733b71ac4c0fc771e89642ba82a6b06a7d3605 100755 (executable)
--- a/shutdown
+++ b/shutdown
@@ -1,15 +1,16 @@
 #!/bin/sh
 #
 #!/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
 #
 #
 # 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
 set -eu
 
 ME=molly-guard
+VERSION=0.4
+SCRIPTSDIR=/etc/molly-guard/run.d
+SCRIPTSDIR="${0%/*}/run.d"
 
 CMD="${0##*/}"
 EXEC="/sbin/$CMD"
 
 CMD="${0##*/}"
 EXEC="/sbin/$CMD"
@@ -30,48 +31,88 @@ case "$CMD" in
     exit 1
     ;;
 esac
     exit 1
     ;;
 esac
-ARGS="$@"
 
 
-do_real_cmd()
+usage()
 {
 {
-  case "$ARGS" in
-    (*--molly-guard-do-nothing*)
-      ARGS0="${ARGS%%--molly-guard-do-nothing*}"
-      ARGS1="${ARGS##*--molly-guard-do-nothing}"
-      echo "$ME: would run: $EXEC ${ARGS0# } ${ARGS1# }"
-      exit 0;;
-    *) eval exec $EXEC "$ARGS";;
-  esac
-}
+  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.
 
 
-# require $SSH_CONNECTION to be set, indicates an SSH session
-[ -n "${SSH_CONNECTION:-}" ] || do_real_cmd
-# require an interactive terminal connected to stdin
-test -t 0                    || do_real_cmd
-# pass through help commands
-case "$CMD $ARGS" in
-  (shutdown\ *-c*) do_real_cmd;;
-  (shutdown\ *-h*) do_real_cmd;;
-  (*--help*) do_real_cmd;;
-  *) :;;
-esac
+       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.
 
 
-HOSTNAME="$(hostname)"
+       The actual command's help output follows:
 
 
-sigh()
+       _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
+      eval $EXEC --help 2>&1
+      exit 0
+      ;;
+    --) 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()
 {
 {
-  echo "Good thing I asked; I won't $CMD $HOSTNAME ..."
-  exit 2
+  if [ $DO_NOTHING -eq 1 ]; then
+    echo "$ME: would run: $EXEC $CMDARGS"
+    exit 0
+  else
+    eval exec $EXEC "$CMDARGS"
+  fi
 }
 
 }
 
-trap 'echo;sigh' 1 2 3 9 10 12 15
+if [ $DO_NOTHING -eq 1 ]; then
+  echo "I: demo mode; $ME will not do anything due to --molly-guard-do-nothing."
+fi
 
 
-echo "$ME: SSH session detected!"
-echo -n "Please type in hostname of the machine to $CMD: "
-read HOSTNAME_USER || :
+# pass through certain commands
+case "$CMD $CMDARGS" in
+  (*shutdown\ *-c*)
+    # allow canceling shutdowns
+    echo "I: executing $CMD $CMDARGS regardless of check results."
+    do_real_cmd
+    ;;
+esac
 
 
-[ "$HOSTNAME_USER" = "$HOSTNAME" ] || sigh
+MOLLYGUARD_CMD=$CMD; export MOLLYGUARD_CMD
+MOLLYGUARD_DO_NOTHING=$DO_NOTHING; export MOLLYGUARD_DO_NOTHING
+MOLLYGUARD_SETTINGS="/etc/default/$ME"; export MOLLYGUARD_SETTINGS
 
 
-trap - 1 2 3 9 10 12 15
+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
 
 do_real_cmd