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This adds support for a new kernel command line option "systemd.volatile=" that provides the same functionality that systemd-nspawn's --volatile= switch provides, but for host systems (i.e. systems booting with a kernel). It takes the same parameter and has the same effect. In order to implement systemd.volatile=yes a new service systemd-volatile-root.service is introduced that only runs in the initrd and rearranges the root directory as needed to become a tmpfs instance. Note that systemd.volatile=state is implemented different: it simply generates a var.mount unit file that is part of the normal boot and has no effect on the initrd execution. The way this is implemented ensures that other explicit configuration for /var can always override the effect of these options. Specifically, the var.mount unit is generated in the "late" generator directory, so that it only is in effect if nothing else overrides it.
systemd - System and Service Manager
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