Bug#900366: postinst creation of /etc/machine-id breaks CustomFirstBoot unit parameter

[Matthew Richardson]

Package: systemd
Version: 238-5

The postinst for the systemd deb pkg contains the following:

# Create /etc/machine-id
systemd-machine-id-setup

This generates /etc/machine-id as the package is installed.

However the systemd unit option ConditionFirstBoot uses the presence or
absence of this file to detect whether or not this is the first boot.
From 'man systemd.unit'

"ConditionFirstBoot= takes a boolean argument. This condition may be
used to conditionalize units on whether the system is booting up with an
unpopulated /etc directory (specifically: an /etc with no
/etc/machine-id). This may be used to populate /etc on the first boot
after factory reset, or when a new system instance boots up for the
first time."

Since no unit can start until after systemd is installed, and the
install always creates this file, this test will always be False which
renders this option useless.



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