That situation should never arise, because if the symlink exists, then
it was created by a successful boot with systemd sometime in the past;
systemd's API is that it guarantees to create /etc/machine-id before
running third-party code; and systemd never deletes the machine ID after
it has created one.

The ideal behaviour would be for dbus-uuidgen to replace the symlink
with a newly generated plain file, I think. I'd be happy to review a
patch (on freedesktop.org Bugzilla please) if that isn't already what it
does.

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https://bugs.launchpad.net/bugs/1508697

Title:
  dbus-uuidgen --ensure: Symlink instead of copy existing /etc/machine-
  id

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