generator: Exit if there's no /run/ostree
#3147
Merged
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Currently if run in a container image under systemd, we will incorrectly synthesize a
var.mount
unit even ifostree-prepare-root
hasn't run.The comment here said why we didn't do that before, but that's for the really legacy embedded-only "ostree-prepare-root-static" path, and even then I'm pretty sure it was wrong because the generator here only runs in the real root, and we should have
/run/ostree
at that point.