Merge remote-tracking branch 'origin/merge-requests/303'

By Christian Hesse
* origin/merge-requests/303:
  archiso/mkarchiso: write "uninitialized" to /etc/machine-id

See merge request https://gitlab.archlinux.org/archlinux/archiso/-/merge_requests/303

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
 -------

archiso/mkarchiso

@@ -163,9 +163,10 @@ _cleanup_pacstrap_dir() {
     [[ -d "${pacstrap_dir}/var/tmp" ]] && find "${pacstrap_dir}/var/tmp" -mindepth 1 -delete
     # Delete package pacman related files.
     find "${work_dir}" \( -name '*.pacnew' -o -name '*.pacsave' -o -name '*.pacorig' \) -delete
-    # Create an empty /etc/machine-id
+    # Create /etc/machine-id with special value 'uninitialized': the final id is
+    # generated on first boot, systemd's first-boot mechanism applies (see machine-id(5))
     rm -f -- "${pacstrap_dir}/etc/machine-id"
-    printf '' > "${pacstrap_dir}/etc/machine-id"
+    printf 'uninitialized\n' > "${pacstrap_dir}/etc/machine-id"
 
     _msg_info "Done!"
 }