units: skip systemd-battery-check in environments where it doesn't make sense

Let's condition the service so that it doesn't run where we aren't
directly run on baremetal, or where no power sources are discovered at
all.

diff --git a/units/systemd-battery-check.service.in b/units/systemd-battery-check.service.in
index 3de8ba1d8eb92b69cb94f9ec113a5d4bc52e183d..61f4ae16e08c92b948be65fcdddd9dca9c902ce0 100644 (file)
--- a/units/systemd-battery-check.service.in
+++ b/units/systemd-battery-check.service.in
@@ -10,8 +10,10 @@
 [Unit]
 Description=Check battery level during early boot
 Documentation=man:systemd-battery-check.service(8)
-DefaultDependencies=no
+ConditionVirtualization=no
+ConditionDirectoryNotEmpty=/sys/class/power_supply/
 AssertPathExists=/etc/initrd-release
+DefaultDependencies=no
 After=plymouth-start.service
 Before=initrd-root-device.target