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c78c095b1e
We should never have used an unprefixed environment variable name. All other systemd-nspawn variables have the "SYSTEMD_NSPAWN_" prefix, and all other systemd variables have the "SYSTEMD_" prefix. The new variable name takes precedence, but we fall back to checking the old one. If only the old one is found, a warning is emitted. In addition, SYSTEMD_NSPAWN_UNIFIED_HIERARCHY="" is accepted as an override to avoid looking for the old variable name. We have a variable with the same name ($UNIFIED_CGROUP_HIERARCHY) in tests, which governs both systemd-nspawn and qemu behaviour. It is not renamed.