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4a3d57a47a
systemd-networkd cannot create the directory /run/systemd/resolve.hook/. Even
if the directory exists, it is not owned by systemd-network user/group, so
systemd-networkd cannot create socket file in the directory. Hence, if the
systemd-networkd-resolve-hook.socket unit is disabled, networkd fails to open
the varlink socket, and fail to start:
systemd-networkd[1304645]: Failed to bind to systemd-resolved hook Varlink socket: Permission denied
systemd-networkd[1304645]: Could not set up manager: Permission denied
systemd[1]: systemd-networkd.service: Main process exited, code=exited, status=1/FAILURE
systemd[1]: systemd-networkd.service: Failed with result 'exit-code'.
systemd[1]: Failed to start systemd-networkd.service - Network Management.
If the socket unit is disabled, that should mean the system administrator wants
to disable the feature. Let's not try to setup the varlink socket in that case.
Now the resolve hook feature can be toggled by enabling/disabling the socket
unit, let's drop the $SYSTEMD_NETWORK_RESOLVE_HOOK environment variable.
Follow-up for a7fa29b1b5.
Co-authored-by: Yu Watanabe <watanabe.yu+github@gmail.com>