debug-shell: add condition for tty device to run on

diff --git a/units/debug-shell.service.in b/units/debug-shell.service.in
index a6acad3..59f6e49 100644 (file)
--- a/units/debug-shell.service.in
+++ b/units/debug-shell.service.in
@@ -10,6 +10,7 @@ Description=Early root shell on @DEBUGTTY@ FOR DEBUGGING ONLY
 Documentation=man:sushell(8)
 DefaultDependencies=no
 IgnoreOnIsolate=yes
+ConditionPathExists=@DEBUGTTY@
 
 [Service]
 Environment=TERM=linux