Lennart Poettering 57d1ceffb3 dissect-image: turn verity device sharing into opt-in
Sharing verity volumes is problematic for a veriety of reasons, for
example because it might pin the wrong backing device at the wrong time.

Let's hence turn this around: unless verity sharing is enabled, leave it
off, and turn $SYSTEMD_VERITY_SHARING into a true boolean that can be
set both ways.

The primary usecase for verity sharing is RootImage=, where it probably
makes sense to leave on, hence set the flag there.

This is crucial when putting together installers which install an OS on
a second disk: if verity sharing is always on we might mount the wrong
of the two disks at the wrong time.
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Systemd

System and Service Manager

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