archiso/mkarchiso: write "uninitialized" to /etc/machine-id

This is a new value introduced in systemd v247. It makes sure a new
machine-id is generated, but is handled as first boot as well.

See "First Boot Semantics" in machine-id(5) for details.

1 files changed, 3 insertions, 0 deletions

diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 4966b84..19a4d91 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -18,6 +18,9 @@ Changed
 - Error out early if any of the code signing certificate files passed with option ``-c`` do not exist.
 - Use LZMA compressed EROFS image for the baseline profile. Now that xz 5.4 is out and erofs-utils is built with LZMA
   support, using a higher compression is possible.
+- Add ``/etc/machine-id`` with special value ``uninitialized``. The final id is generated at boot time, and systemd's
+  first-boot mechanim (see ``First Boot Semantics`` in ``machine-id(5)``) applies. No functional change unless that
+  ``ConditionFirstBoot=yes`` is true and passive unit ``first-boot-complete.target`` activates for ordering.
 
 Removed
 -------