systemd-system-update-generator — Generator for redirecting boot to offline update mode
/usr/lib/systemd/system-generators/systemd-system-update-generator
systemd-system-update-generator is a
generator that automatically redirects the boot process to
system-update.target if
/system-update exists. This is required to
implement the logic explained in the System
Updates Specification.
systemd-system-update-generator
implements the
generator
specification.