Adding shortcut helper for dctrl-tools.

This 'Packages' shortcut helper can be used for simplified
usage of grep-aptavailable from dctrl-tools.

Rather than needing to specify the following explicit command:

  ! grep-aptavail -n -sPackage -FPriority standard

in package lists, the following shortcut can be used:

  ! Packages Priority standard

1 files changed, 30 insertions, 0 deletions

diff --git a/share/bin/Packages b/share/bin/Packages
new file mode 100755
index 000000000..06ce05ed3
--- /dev/null
+++ b/share/bin/Packages
@@ -0,0 +1,30 @@
+#!/bin/sh
+
+## live-build(7) - System Build Scripts
+## Copyright (C) 2006-2012 Daniel Baumann <daniel@debian.org>
+##
+## live-build comes with ABSOLUTELY NO WARRANTY; for details see COPYING.
+## This is free software, and you are welcome to redistribute it
+## under certain conditions; see COPYING for details.
+
+
+set -e
+
+if [ ! -e /usr/bin/grep-aptavail ]
+then
+	echo "E: /usr/bin/grep-aptavail: No such file."
+
+	exit 1
+fi
+
+if [ -z "${@}" ]
+then
+	echo "Usage: $(basename ${0}) FIELD VALUE"
+
+	exit 1
+fi
+
+_FIELD="${1}"
+_VALUE="${2}"
+
+grep-aptavail -n -sPackage -F${_FIELD} ${_VALUE} | sort