addrepo: add support for dnf, add support for epel repo add

bin/epm-addrepo

 #!/bin/sh
 #
-# Copyright (C) 2012, 2017  Etersoft
-# Copyright (C) 2012, 2017  Vitaly Lipatov <lav@etersoft.ru>
+# Copyright (C) 2012, 2017, 2019  Etersoft
+# Copyright (C) 2012, 2017, 2019  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
@@ -19,6 +19,24 @@
 
 load_helper epm-sh-altlinux
 
+__epm_addrepo_rhel()
+{
+	local repo="$@"
+	if [ -z "$repo" ] ; then
+		echo "Add repo."
+		echo "1. Use with repository URL, f.i. http://www.example.com/example.repo"
+		echo "2. Use with epel to add EPEL repository"
+		return 1
+	fi
+	case "$1" in
+		epel)
+			epm install epel-release
+			return 1
+			;;
+	esac
+	return 0
+}
+
 __epm_addrepo_altlinux()
 {
 	local repo="$@"
@@ -114,8 +132,13 @@ case $PMTYPE in
 		;;
 	yum-rpm)
 		assure_exists yum-utils
+		__epm_addrepo_rhel "$repo" || return
 		sudocmd yum-config-manager --add-repo "$repo"
 		;;
+	dnf-rpm)
+		__epm_addrepo_rhel "$repo" || return
+		sudocmd dnf config-manager --add-repo "$repo"
+		;;
 	urpm-rpm)
 		sudocmd urpmi.addmedia "$repo"
 		;;