44d82df46e
I was changing how some properties are appended to the StartTransientUnit call and messed up the message contents. When something is wrong with how the message is structed, we would return a very generic "Failed to start transient service unit: No such device or address". Mention that it was property setting that failed, and translate ENXIO to a different message. bus_unit_set_properties() or any of the children it calls may also return other errors, in particular EBADMSG or ENOMEM, but the error message that is generated for those is understandable, so we don't need to "translate" them explicitly. bus_unit_set_properties() is called from two places, so it seems nicer to generate the message internally, rather than ask the caller to do that. Also, now bus_unit_set_properties() always sets <error>, which is nicer for the callers.
System and Service Manager
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