support release upgrade for p9

bin/epm-release_upgrade

 #!/bin/sh
 #
-# Copyright (C) 2013, 2016, 2017  Etersoft
-# Copyright (C) 2013, 2016, 2017  Vitaly Lipatov <lav@etersoft.ru>
+# Copyright (C) 2013, 2016, 2017, 2019  Etersoft
+# Copyright (C) 2013, 2016, 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
@@ -150,7 +150,7 @@ __update_to_the_distro()
 			docmd epm update || fatal
 			docmd epm upgrade || fatal "Check an error and run epm release-upgrade again"
 			;;
-		p8)
+		p8|p9)
 			docmd epm update || fatal
 			docmd epm install rpm apt "$(get_fix_release_pkg --force "$TO")" || fatal "Check an error and run epm release-upgrade again"
 			__alt_repofix
@@ -211,7 +211,17 @@ __update_alt_to_next_distro()
 			docmd epm downgrade || fatal
 			info "Done."
 			;;
-		"p8 Sisyphus"|"Sisyphus Sisyphus")
+		"Sisyphus p9")
+			TO="p9"
+			confirm_info "Downgrade $DISTRNAME from $FROM to $TO ..."
+			docmd epm install "$(get_fix_release_pkg "$FROM")" || fatal
+			__replace_alt_version_in_repo "$FROM/" "$TO/branch/"
+			__replace_text_in_alt_repo "/^ *#/! s!\[alt\]![$TO]!g"
+			__update_to_the_distro $TO
+			docmd epm downgrade || fatal
+			info "Done."
+			;;
+		"p8 Sisyphus"|"p9 Sisyphus"|"Sisyphus Sisyphus")
 			TO="Sisyphus"
 			confirm_info "Upgrade $DISTRNAME from $FROM to $TO ..."
 			docmd epm install rpm apt "$(get_fix_release_pkg "$FROM")" || fatal
@@ -258,15 +268,18 @@ epm_release_upgrade()
 			fi
 		fi
 
-		__alt_repofix
-
 		# check forced target
 		if [ -n "$pkg_filenames" ] ; then
 			[ "$(__wcount $pkg_filenames)" = "1" ] || fatal "Too many args: $pkg_filenames"
 		fi
 
+		TARGET="$pkg_filenames"
+
+		__alt_repofix
+
+
 		# TODO: ask before upgrade
-		__update_alt_to_next_distro $DISTRVERSION $pkg_filenames
+		__update_alt_to_next_distro $DISTRVERSION $TARGET
 		return
 		;;
 	*)