From 14b93c5ff3f25933e2f27382a8477174bb7fdf76 Mon Sep 17 00:00:00 2001
From: Norman Feske <norman.feske@genode-labs.com>
Date: Tue, 15 Feb 2022 16:08:32 +0100
Subject: [PATCH] run: handle empty create_tar_from_depot_binaries

This patch works around 'tar' erroring out when faced with an empty list
of files:

  tar: Cowardly refusing to create an empty archive

This can happen when using sculpt.run for a scenario with only a runtime
but no deploy or launcher configuration.

Issue #4369
---
 tool/run/depot.inc | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tool/run/depot.inc b/tool/run/depot.inc
index 59ec4b4023..9477e2a298 100644
--- a/tool/run/depot.inc
+++ b/tool/run/depot.inc
@@ -343,7 +343,11 @@ proc create_tar_from_depot_binaries { archive_path args } {
 
 	check_for_missing_depot_archives
 
-	eval "exec tar cf $archive_path -C [depot_dir] [lsort -unique $content]"
+	if {[llength $args] > 0} {
+		eval "exec tar cf $archive_path -C [depot_dir] [lsort -unique $content]"
+	} else {
+		eval "exec tar cf $archive_path -T /dev/null"
+	}
 }