Adding upstream version 0.8.4.upstream/0.8.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

6 files changed, 688 insertions, 0 deletions

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..afb034d
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,49 @@
+PREFIX?=/usr
+cfgdir?=/etc/molly-guard
+libdir?=$(PREFIX)/lib
+sbindir?=$(PREFIX)/sbin
+REALPATH?=$(libdir)/molly-guard
+
+all: molly-guard.8 shutdown
+
+%.8: DB2MAN=/usr/share/sgml/docbook/stylesheet/xsl/nwalsh/manpages/docbook.xsl
+%.8: XP=xsltproc -''-nonet
+%.8: %.xml
+	$(XP) $(DB2MAN) $<
+
+man: molly-guard.8
+	man -l $<
+.PHONY: man
+
+clean:
+	rm -f shutdown
+	rm -f molly-guard.8
+.PHONY: clean
+
+shutdown: shutdown.in
+	sed -e 's,@cfgdir@,$(cfgdir),g;s,@REALPATH@,$(REALPATH),g' $< > $@
+
+install: shutdown molly-guard.8
+	mkdir -m755 --parent $(DESTDIR)$(libdir)/molly-guard
+	install -m755 -oroot -oroot shutdown $(DESTDIR)$(libdir)/molly-guard/molly-guard
+	
+	mkdir -m755 --parent $(DESTDIR)$(sbindir)
+	ln -s $(libdir)/molly-guard/molly-guard $(DESTDIR)$(sbindir)/poweroff
+	ln -s $(libdir)/molly-guard/molly-guard $(DESTDIR)$(sbindir)/halt
+	ln -s $(libdir)/molly-guard/molly-guard $(DESTDIR)$(sbindir)/reboot
+	ln -s $(libdir)/molly-guard/molly-guard $(DESTDIR)$(sbindir)/shutdown
+	ln -s $(libdir)/molly-guard/molly-guard $(DESTDIR)$(sbindir)/coldreboot
+	ln -s $(libdir)/molly-guard/molly-guard $(DESTDIR)$(sbindir)/pm-hibernate
+	ln -s $(libdir)/molly-guard/molly-guard $(DESTDIR)$(sbindir)/pm-suspend
+	ln -s $(libdir)/molly-guard/molly-guard $(DESTDIR)$(sbindir)/pm-suspend-hybrid
+	
+	mkdir -m755 --parent $(DESTDIR)$(cfgdir)
+	install -m644 -oroot -oroot rc $(DESTDIR)$(cfgdir)
+	cp -r run.d $(DESTDIR)$(cfgdir) \
+	  && chown root.root $(DESTDIR)$(cfgdir)/run.d && chmod 755 $(DESTDIR)$(cfgdir)/run.d
+	
+	mkdir -m755 --parent $(DESTDIR)$(cfgdir)/messages.d
+	
+	mkdir -m755 --parent $(DESTDIR)$(PREFIX)/share/man/man8
+	install -m644 -oroot -groot molly-guard.8 $(DESTDIR)$(PREFIX)/share/man/man8
+.PHONY: install
diff --git a/molly-guard.xml b/molly-guard.xml
new file mode 100644
index 0000000..9c01f2f
--- /dev/null
+++ b/molly-guard.xml
@@ -0,0 +1,344 @@
+<?xml version='1.0' encoding='ISO-8859-1'?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" [
+
+<!--
+
+Process this file with an XSLT processor: `xsltproc \
+-''-nonet /usr/share/sgml/docbook/stylesheet/xsl/nwalsh/\
+manpages/docbook.xsl manpage.dbk'.  A manual page
+<package>.<section> will be generated.  You may view the
+manual page with: nroff -man <package>.<section> | less'.  A
+typical entry in a Makefile or Makefile.am is:
+
+DB2MAN=/usr/share/sgml/docbook/stylesheet/xsl/nwalsh/\
+manpages/docbook.xsl
+XP=xsltproc -''-nonet
+
+manpage.1: manpage.dbk
+        $(XP) $(DB2MAN) $<
+    
+The xsltproc binary is found in the xsltproc package.  The
+XSL files are in docbook-xsl.  Please remember that if you
+create the nroff version in one of the debian/rules file
+targets (such as build), you will need to include xsltproc
+and docbook-xsl in your Build-Depends control field.
+
+-->
+
+  <!-- Fill in your name for FIRSTNAME and SURNAME. -->
+  <!ENTITY dhfirstname "<firstname>martin f.</firstname>">
+  <!ENTITY dhsurname   "<surname>krafft</surname>">
+  <!-- Please adjust the date whenever revising the manpage. -->
+  <!ENTITY dhdate      "<date>Apr 19, 2008</date>">
+  <!-- SECTION should be 1-8, maybe w/ subsection other parameters are
+       allowed: see man(7), man(1). -->
+  <!ENTITY dhsection   "<manvolnum>8</manvolnum>">
+  <!ENTITY dhemail     "<email>madduck@madduck.net</email>">
+  <!ENTITY dhusername  "martin f. krafft">
+  <!ENTITY dhucpackage "<refentrytitle>molly-guard</refentrytitle>">
+  <!ENTITY dhpackage   "molly-guard">
+  <!ENTITY dhcommand   "<command>molly-guard</command>">
+
+  <!ENTITY debian      "<productname>Debian</productname>">
+  <!ENTITY gnu         "<acronym>GNU</acronym>">
+  <!ENTITY gpl         "&gnu; <acronym>GPL</acronym>">
+]>
+
+<refentry>
+  <refentryinfo>
+    <address>
+      &dhemail;
+    </address>
+    <copyright>
+      <year>2008</year>
+      <holder>&dhusername;</holder>
+    </copyright>
+    &dhdate;
+  </refentryinfo>
+  <refmeta>
+    &dhucpackage;
+
+    &dhsection;
+  </refmeta>
+  <refnamediv>
+    <refname>&dhcommand;</refname>
+
+    <refpurpose>guard against accidental shutdowns/reboots</refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv>
+    <cmdsynopsis>
+      <command>shutdown</command>
+      <arg choice="opt">
+        -<option>hV</option>
+      </arg>
+      <arg choice="opt">
+        <option>--molly-guard-do-nothing</option>
+      </arg>
+      <arg choice="opt">
+        -- <replaceable>script_options</replaceable>
+      </arg>
+    </cmdsynopsis>
+    <cmdsynopsis>
+      <command>halt</command>
+      <arg choice="opt">
+        -<option>hV</option>
+      </arg>
+      <arg choice="opt">
+        <option>--molly-guard-do-nothing</option>
+      </arg>
+      <arg choice="opt">
+        -- <replaceable>script_options</replaceable>
+      </arg>
+    </cmdsynopsis>
+    <cmdsynopsis>
+      <command>reboot</command>
+      <arg choice="opt">
+        -<option>hV</option>
+      </arg>
+      <arg choice="opt">
+        <option>--molly-guard-do-nothing</option>
+      </arg>
+      <arg choice="opt">
+        -- <replaceable>script_options</replaceable>
+      </arg>
+    </cmdsynopsis>
+    <cmdsynopsis>
+      <command>poweroff</command>
+      <arg choice="opt">
+        -<option>hV</option>
+      </arg>
+      <arg choice="opt">
+        <option>--molly-guard-do-nothing</option>
+      </arg>
+      <arg choice="opt">
+        -- <replaceable>script_options</replaceable>
+      </arg>
+    </cmdsynopsis>
+    <cmdsynopsis>
+      <command>coldreboot</command>
+      <arg choice="opt">
+        -<option>hV</option>
+      </arg>
+      <arg choice="opt">
+        <option>--molly-guard-do-nothing</option>
+      </arg>
+      <arg choice="opt">
+        -- <replaceable>script_options</replaceable>
+      </arg>
+    </cmdsynopsis>
+    <cmdsynopsis>
+      <command>pm-hibernate</command>
+      <arg choice="opt">
+        -<option>hV</option>
+      </arg>
+      <arg choice="opt">
+        <option>--molly-guard-do-nothing</option>
+      </arg>
+      <arg choice="opt">
+        -- <replaceable>script_options</replaceable>
+      </arg>
+    </cmdsynopsis>
+    <cmdsynopsis>
+      <command>pm-suspend</command>
+      <arg choice="opt">
+        -<option>hV</option>
+      </arg>
+      <arg choice="opt">
+        <option>--molly-guard-do-nothing</option>
+      </arg>
+      <arg choice="opt">
+        -- <replaceable>script_options</replaceable>
+      </arg>
+    </cmdsynopsis>
+    <cmdsynopsis>
+      <command>pm-suspend-hybrid</command>
+      <arg choice="opt">
+        -<option>hV</option>
+      </arg>
+      <arg choice="opt">
+        <option>--molly-guard-do-nothing</option>
+      </arg>
+      <arg choice="opt">
+        -- <replaceable>script_options</replaceable>
+      </arg>
+    </cmdsynopsis>
+  </refsynopsisdiv>
+
+  <refsect1>
+    <title>DESCRIPTION</title>
+
+    <para> &dhcommand; attempts to prevent you from accidentally shutting down
+      or rebooting machines. It does this by injecting a couple of checks
+      before the existing commands: <command>coldreboot</command>,
+      <command>halt</command>, <command>reboot</command>,
+      <command>shutdown</command>, <command>poweroff</command>,
+      <command>pm-hibernate</command>,<command>pm-suspend</command>
+      and <command>pm-suspend-hybrid</command>.</para>
+
+    <para> Before &dhcommand; invokes the real command, all scripts in
+      <filename>/etc/molly-guard/run.d/</filename> have to run and exit
+      successfully; else, it aborts the command.
+      <command>run-parts(1)</command> is used to process the directory.</para>
+
+    <para> &dhcommand; passes any <replaceable>script_options</replaceable> to the
+      scripts, and also populates the environment with the following
+      variables:</para>
+
+    <itemizedlist>
+      <listitem><para><envar>MOLLYGUARD_CMD</envar> - the actual command
+          invoked by the user.</para></listitem>
+
+      <listitem><para><envar>MOLLYGUARD_DO_NOTHING</envar> - set to
+          <option>1</option> if this is a demo-run.</para></listitem>
+
+      <listitem><para><envar>MOLLYGUARD_SETTINGS</envar> - the path to
+          a shell script snippet which scripts can source to obtain
+          settings.</para></listitem>
+    </itemizedlist>
+
+    <para> &dhcommand; prints the contents of
+      <filename>/etc/molly-guard/messages.d/COMMAND</filename> or
+      <filename>/etc/molly-guard/messages.d/default</filename> to the console,
+      if either exists. This is due to
+      <filename>/etc/molly-guard/run.d/10-print-message</filename>.</para>
+
+  </refsect1>
+  <refsect1>
+    <title>GUARDING SSH SESSIONS</title>
+
+    <para> &dhcommand; was primarily designed to shield SSH connections. This
+      functionality (which should arguably be provided by the
+      <package>openssh-server</package> package) is implemented in
+      <filename>/etc/molly-guard/run.d/30-query-hostname</filename>.</para>
+
+    <para> This script first tests whether the command is being executed from
+      a <filename>tty</filename> which has been created by
+      <command>sshd</command>. It also checks whether the variable
+      <envar>SSH_CONNECTION</envar> is defined. If any of these tests are
+      successful, test script queries the user for the machine's hostname,
+      which should be sufficient to prevent the user from doing something by
+      accident.</para>
+
+    <para> You can pass the <option>--pretend-ssh</option> script option to
+      &dhcommand; to pretend that those tests succeeds. Alternatively, setting
+      <envar>ALWAYS_QUERY_HOSTNAME</envar> in
+      <filename>/etc/molly-guard/rc</filename> causes the script to
+      always query.</para>
+
+    <para> The following situations are still UNGUARDED. If you can think of
+      ways to protect against those, please let me know!</para>
+
+    <itemizedlist>
+      <listitem><para>running <application>sudo</application> within
+          <application>screen</application> or <application>screen</application> within
+          <application>sudo</application>; <application>sudo</application> eats the
+          <envar>SSH_CONNECTION</envar> variable, and
+          <application>screen</application> creates a new
+          <filename>pty</filename>.</para></listitem>
+      <listitem><para>executing those command in a remote terminal window,
+          that is a <application>XTerm</application> started on a remote
+          machine but displaying on the local <application>X</application>
+          server.</para></listitem>
+    </itemizedlist>
+
+    <para> You have been warned. You can use the
+      <option>--molly-guard-do-nothing</option> switch to prevent anything
+      from happening, e.g. <userinput>halt
+        --molly-guard-do-nothing</userinput>. </para>
+  </refsect1>
+
+  <refsect1>
+    <title>OPTIONS</title>
+    <variablelist>
+      <varlistentry>
+	<term>--molly-guard-do-nothing</term>
+	<listitem>
+	  <para>
+	    Cause &dhcommand; to print the command which would be executed,
+	    after processing all scripts, instead of executing it.
+          </para>
+	</listitem>
+      </varlistentry>
+
+      <varlistentry>
+	<term>-h</term>
+	<term>--help</term>
+	<listitem>
+	  <para>
+            Display usage information.
+          </para>
+	</listitem>
+      </varlistentry>
+
+      <varlistentry>
+	<term>-V</term>
+	<term>--version</term>
+	<listitem>
+	  <para>
+            Display version information.
+          </para>
+	</listitem>
+      </varlistentry>
+    </variablelist>
+  </refsect1>
+
+  <refsect1>
+    <title>SEE ALSO</title>
+    <para>
+      <citerefentry>
+	<refentrytitle>shutdown</refentrytitle>
+	<manvolnum>8</manvolnum>
+      </citerefentry>,
+      <citerefentry>
+	<refentrytitle>halt</refentrytitle>
+	<manvolnum>1</manvolnum>
+      </citerefentry>,
+      <citerefentry>
+	<refentrytitle>reboot</refentrytitle>
+	<manvolnum>8</manvolnum>
+      </citerefentry>,
+      <citerefentry>
+	<refentrytitle>poweroff</refentrytitle>
+	<manvolnum>8</manvolnum>
+      </citerefentry>.
+      <citerefentry>
+	<refentrytitle>coldreboot</refentrytitle>
+	<manvolnum>8</manvolnum>
+      </citerefentry>.
+      <citerefentry>
+	<refentrytitle>pm-hibernate</refentrytitle>
+	<manvolnum>8</manvolnum>
+      </citerefentry>.
+      <citerefentry>
+	<refentrytitle>pm-suspend</refentrytitle>
+	<manvolnum>8</manvolnum>
+      </citerefentry>.
+      <citerefentry>
+	<refentrytitle>pm-suspend-hybrid</refentrytitle>
+	<manvolnum>8</manvolnum>
+      </citerefentry>.
+    </para>
+  </refsect1>
+
+  <refsect1>
+    <title>LEGALESE</title>
+
+    <para>
+      &dhpackage; is copyright by &dhusername;. Andrew Ruthven came up with
+      the idea of using the scripts directory and submitted a patch, which
+      I modified a bit.
+    </para>
+
+    <para>
+      This manual page was written by &dhusername; &dhemail;.
+    </para>
+
+    <para>
+      Permission is granted to copy, distribute and/or modify this document
+      under the terms of the Artistic License 2.0
+    </para>
+
+  </refsect1>
+</refentry>
diff --git a/rc b/rc
new file mode 100644
index 0000000..ee1ff43
--- /dev/null
+++ b/rc
@@ -0,0 +1,19 @@
+# molly-guard settings
+#
+# ALWAYS_QUERY_HOSTNAME
+# When set, causes the 30-query-hostname script to always ask for the
+# hostname, even if no SSH session was detected.
+#ALWAYS_QUERY_HOSTNAME=true
+
+# USE_FQDN
+# When set, causes the 30-query-hostname script to ask for the fully-qualified
+# hostname, rather than the short name
+#USE_FQDN=true
+
+# ANSIBLE_SEARCH_STRING
+# The string to search for in the broadcast message provided to shutdown
+# set by Ansible. Used to detect if Ansible has initiated a reboot via
+# the ansible.builtin.reboot module the default message is "Reboot initiated
+# by Ansible" but can be changed by setting the "msg" parameter. This is
+# a case insensitive search.
+#ANSIBLE_SEARCH_STRING="ansible"
diff --git a/run.d/10-print-message b/run.d/10-print-message
new file mode 100755
index 0000000..0e19526
--- /dev/null
+++ b/run.d/10-print-message
@@ -0,0 +1,22 @@
+#!/bin/sh
+#
+# 10-print-message - print a (command-specific or default) message
+#
+# Copyright © Andrew Ruthven <andrew@etc.gen.nz>
+# Copyright © martin f. krafft <madduck@madduck.net>
+# Released under the terms of the Artistic Licence 2.0
+#
+# Prints either /etc/molly-guard/messages.d/$MOLLYGUARD_CMD
+#            or /etc/molly-guard/messages.d/default
+# depending on whether the first exists.
+#
+set -eu
+
+MESSAGESDIR=/etc/molly-guard/messages.d
+
+for i in $MOLLYGUARD_CMD default; do
+  if [ -f "$MESSAGESDIR/$i" ] && [ -r "$MESSAGESDIR/$i" ]; then
+    cat $MESSAGESDIR/$i
+    exit 0
+  fi
+done
diff --git a/run.d/30-query-hostname b/run.d/30-query-hostname
new file mode 100755
index 0000000..da5c6b8
--- /dev/null
+++ b/run.d/30-query-hostname
@@ -0,0 +1,102 @@
+#!/bin/sh
+#
+# 30-ask-hostname - request the user to type in the hostname of the local host
+#
+# Copyright © 2006-2009 martin f. krafft <madduck@madduck.net>
+# Copyright © 2012 Ludovico Gardenghi <lu@dovi.co>
+# Copyright © 2014 Josh Triplett <josh@joshtriplett.org>
+# Copyright © 2015 Francois Marier <francois@debian.org>
+# Copyright © 2017 Simó Albert i Beltran <sim6@probeta.net>
+# Copyright © 2023 Andrew Ruthven <andrew@etc.gen.nz>
+# Released under the terms of the Artistic Licence 2.0
+#
+set -eu
+
+ME=molly-guard
+
+# Skip if we're being run by configuration management.
+[ $CONFIGURATION_MANAGEMENT -eq 1 ] && exit 0
+
+# Walk up the process tree until PID 1 is reached or a process with 'sshd' in
+# its /proc/<pid>/cmdline is met. Return success if such a process is found.
+is_child_of_sshd_or_mosh_server() {
+  pid=$$
+  ppid=$PPID
+  # Be a bit paranoid with the guard, should some horribly broken system
+  # provide a strange process hierarchy. '[ $pid -ne 1 ]' should be enough for
+  # sane systems.
+  [ -z "$pid" ] || [ -z "$ppid" ] && return 2
+  while [ $pid -gt 1 ] && [ $pid -ne $ppid ]; do
+    if egrep -q 'sshd|mosh-server|etterminal' /proc/$ppid/cmdline; then
+      return 0
+    fi
+    pid=$ppid
+    ppid=$(grep ^PPid: /proc/$pid/status | tr -dc 0-9)
+  done
+  return 1
+}
+
+[ -f "$MOLLYGUARD_SETTINGS" ] && . "$MOLLYGUARD_SETTINGS"
+
+PRETEND_SSH=0
+for arg in "$@"; do
+  case "$arg" in
+    (*-pretend-ssh) PRETEND_SSH=1;;
+  esac
+done
+
+# require an interactive terminal connected to stdin
+test -t 0 || exit 0
+
+# we've been asked to always protect this host
+case "${ALWAYS_QUERY_HOSTNAME:-0}" in
+  0|false|False|no|No|off|Off)
+    # only run if we are being called over SSH, that is if the current terminal
+    # was created by sshd.
+    command -v tty >/dev/null 2>&1 || exit 0
+    PTS=$(tty)
+    if ! pgrep -f "^sshd.+${PTS#/dev/}\>" >/dev/null \
+      && [ -z "${SSH_CONNECTION:-}" ] \
+      && ! is_child_of_sshd_or_mosh_server; then
+        if [ $PRETEND_SSH -eq 1 ]; then
+          echo "I: $ME: this is not an SSH session, but --pretend-ssh was given..." >&2
+        else
+          exit 0
+        fi
+    else
+      echo "W: $ME: SSH session detected!" >&2
+    fi
+    ;;
+  *)
+    echo "I: $ME: $MOLLYGUARD_CMD is always molly-guarded on this system." >&2
+    ;;
+esac
+
+case "${USE_FQDN:-0}" in
+  0|false|False|no|No|off|Off)
+    HOSTNAME="$(hostname --short)"
+    ;;
+  *)
+    HOSTNAME="$(hostname --fqdn)"
+    ;;
+esac
+
+sigh()
+{
+  echo "Good thing I asked; I won't $MOLLYGUARD_CMD $HOSTNAME ..." >&2
+  exit 1
+}
+
+trap 'echo;sigh' 1 2 3 9 10 12 15
+
+echo -n "Please type in hostname of the machine to $MOLLYGUARD_CMD: "
+read HOSTNAME_USER || :
+
+HOSTNAME="$(echo "$HOSTNAME" | tr '[:upper:]' '[:lower:]')"
+HOSTNAME_USER="$(echo "$HOSTNAME_USER" | tr '[:upper:]' '[:lower:]')"
+
+[ "$HOSTNAME_USER" = "$HOSTNAME" ] || sigh
+
+trap - 1 2 3 9 10 12 15
+
+exit 0
diff --git a/shutdown.in b/shutdown.in
new file mode 100755
index 0000000..3216933
--- /dev/null
+++ b/shutdown.in
@@ -0,0 +1,152 @@
+#!/bin/sh
+#
+# shutdown -- wrapper script to guard against accidental shutdowns
+#
+# Copyright © martin f. krafft <madduck@madduck.net>
+# Released under the terms of the Artistic Licence 2.0
+#
+set -eu
+
+ME=molly-guard
+VERSION=0.8
+
+SCRIPTSDIR="@cfgdir@/run.d"
+
+CMD="${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