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RootDirectory= but via a open_tree() file descriptor. This allows setting up the execution environment for a service by the client in a mount namespace and then starting a transient unit in that execution environment using the new property. We also add --root-directory= and --same-root-dir= to systemd-run to have it run services within the given root directory. As systemd-run might be invoked from a different mount namespace than what systemd is running in, systemd-run opens the given path with open_tree() and then sends it to systemd using the new RootDirectoryFileDescriptor= property.