epm-upgrade: restore repo list after error

bin/epm-upgrade

@@ -33,8 +33,11 @@ epm_upgrade()
 		load_helper epm-sh-altlinux
 		if tasknumber "$@" >/dev/null ; then
 			load_helper epm-addrepo
+			load_helper epm-reposave
 			load_helper epm-removerepo
 			load_helper epm-Install
+
+			try_change_alt_repo
 			epm_addrepo "$@"
 			local installlist="$(get_task_packages $*)"
 			# hack: drop -devel packages to avoid package provided by multiple packages
@@ -45,6 +48,8 @@ epm_upgrade()
 			[ -n "$verbose" ] && info "Packages to upgrade: $installlist"
 			(pkg_names="$installlist" epm_Install) || fatal "Can't update repo"
 			epm_removerepo "$@"
+			end_change_alt_repo
+
 			return
 		fi
 	fi