add snap-pac warning hook

hooks/00_snap-pac-removal.hook

@@ -0,0 +1,28 @@
+# snap-pac
+# https://github.com/wesbarnett/snap-pac
+# Copyright (C) 2016 James W. Barnett
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+[Trigger]
+Operation = Remove
+Type = Package
+Target = snap-pac
+
+[Action]
+Description = NOTE: You are removing snap-pac. No post transaction snapshots will be taken.
+Depends = snap-pac
+When = PreTransaction
+Exec = /usr/bin/true