units: skip modprobe@.service if the unit appears to be already loaded

Possible alternative to #14819.

For me, setting RemainAfterExit=yes would be OK, but if people think that it
might cause issues, then this could be a reasonable alternative that still
let's us skip the invocation of the separate binary.

diff --git a/units/modprobe@.service b/units/modprobe@.service
index 5dca2cb77187e249efb9f4b5f71343cdd8d50565..34a0557735f18f648105ecdc83884c65de1ce55d 100644 (file)
--- a/units/modprobe@.service
+++ b/units/modprobe@.service
@@ -13,6 +13,7 @@ DefaultDependencies=no
 Before=sysinit.target
 Documentation=man:modprobe(8)
 ConditionCapability=CAP_SYS_MODULE
+ConditionPathExists=!/sys/module/%I
 
 [Service]
 Type=oneshot