epm: add policy (like apt-cache policy) command

bin/epm

@@ -206,6 +206,9 @@ check_command()
     assure)                   # HELPCMD: <command> [package]: install package if command does not exists
         epm_cmd=assure
         ;;
+    policy)                   # HELPCMD: print detailed information about the priority selection of package
+        epm_cmd=policy
+        ;;
 
 # Repository control
     update)                   # HELPCMD: update remote package repository databases

bin/epm-policy

+#!/bin/sh
+#
+# Copyright (C) 2015  Etersoft
+# Copyright (C) 2015  Vitaly Lipatov <lav@etersoft.ru>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+
+epm_policy()
+{
+
+[ -n "$pkg_names" ] || fatal "Info: missing package(s) name"
+
+case $PMTYPE in
+	apt-rpm)
+		docmd apt-cache policy $pkg_names
+		;;
+	apt-dpkg)
+		docmd apt-cache policy $pkg_names
+		;;
+	*)
+		fatal "Have no suitable command for $PMTYPE"
+		;;
+esac
+
+}