recipes-google/boot/gbmc-no-initrd/post-rwfs.sh

#!/bin/bash
early_id="$(cat /run/machine-id 2>/dev/null)"
current_id="$(cat /etc/machine-id 2>/dev/null)"

if [ -n "$current_id" ] && [ "$early_id" != "$current_id" ]; then
  echo "Machine ID changed from $early_id to $current_id. Updating services." >&2

  # If we have a journal directory for the old ID, rename it to the new one in /run
  if [ -n "$early_id" ] && [ -d "/run/log/journal/$early_id" ]; then
    echo "Merging journal from $early_id to $current_id" >&2
    # systemd-journald might have both directories if it restarted already.
    if [ -d "/run/log/journal/$current_id" ]; then
       cp -a "/run/log/journal/$early_id"/* "/run/log/journal/$current_id"/
       rm -rf "/run/log/journal/$early_id"
    else
       mv "/run/log/journal/$early_id" "/run/log/journal/$current_id"
    fi
  fi

  # Restart journald so it picks up the new machine ID and flushes to the correct path
  echo "Restarting journald" >&2
  systemctl restart systemd-journald

  # Re-exec systemd so it also picks up the new machine ID
  echo "Re-exec systemd" >&2
  systemctl daemon-reexec
else
  # Make sure anything in /etc of the rwfs is applied to systemd
  echo "Etc overlay applied, reloading systemd" >&2
  systemctl daemon-reload
fi

# The hostname isn't set from the static value since it isn't available
# during early boot, read it now that it's available.
if [ -e /etc/hostname ]; then
  echo "Re-reading hostname" >&2
  hostname -F /etc/hostname
fi