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05c6f341b1
See https://bugzilla.redhat.com/show_bug.cgi?id=1893417 for the back story: the fallback hostname matters a lot in certain environments. Right now the only way to configure the fallback hostname is by recompiling systemd, which is obviously problematic in case when the fallback hostname shall differ between different editions of the same distro that share a single compiled rpm. By making this overridable through an envvar, we're providing an escape hatch without making this a top-level api. Later on a way to set this through os-release is added, but I think the approach with the variable is still useful. It it very convenient for testing, or to override settings only in a particular service, etc.