* Disable systemd-logind support for udisks2
Currently udisks2 uses systemd-logind to prevent the system from
rebooting or similar operations while udisks operations are ongoing.
Unfortunately this stops us from using udisks2 during early boot since
systemd-logind is not ready at this point. Make the dependency
configureable so we can opt-out of using systemd-logind.
* Make dbus.service/socket and udisks2.service/socket available early
Disable default dependencies. This avoids those services to be ordered
after sysinit.target, and makes them available before local-fs.target
is reached. All mounts like mnt-data.mount are ordered before
local-fs.target, so breaking this dependency allows to use D-Bus before
mounting local file systems.
This seems fine when using the system bus directly from /run (instead of
/var/run, which is anyway a symlink to /run normally). It seems that
udisks misses /var/lib/udisks2 but it seems not to be required for the
features used so far.
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