epm-print: improve print pkgsourcename

bin/epm-print

 #!/bin/sh
 #
-# Copyright (C) 2015, 2016, 2018  Etersoft
-# Copyright (C) 2008, 2015, 2016, 2018  Vitaly Lipatov <lav@etersoft.ru>
+# Copyright (C) 2015, 2016, 2018, 2020  Etersoft
+# Copyright (C) 2008, 2015, 2016, 2018, 2020  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
@@ -92,6 +92,29 @@ print_specname()
 
 print_srcpkgname()
 {
+
+    if [ -n "$FNFLAG" ] ; then
+        query_package_field sourcerpm "$@"
+        return
+    fi
+
+    # if PKFLAG
+    case $PMTYPE in
+        apt-dpkg)
+            fatal "Unknown command for get source package name via dpkg"
+            ;;
+        urpm-rpm)
+            docmd urpmq --sourcerpm "$@"
+            return
+            ;;
+        dnf-rpm)
+            showcmd dnf repoquery --qf '%{SOURCERPM}' "$@"
+            a= dnf repoquery --qf '%{SOURCERPM}' "$@"
+            return
+            ;;
+    esac
+
+    # FIXME: only for installed rpm packages
     query_package_field sourcerpm "$@"
 }