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, 2 deletions

diff --git a/archiso/mkarchiso b/archiso/mkarchiso
index 8449f51..7331bb0 100755
--- a/archiso/mkarchiso
+++ b/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!"
 }