make image parent check more robust

[vrothberg]

Follow up on issue #7444 and make the parent checks more robust.
We can end up with an incoherent storage when, for instance, a
build has been killed.

Signed-off-by: Valentin Rothberg [email protected]

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[rhatdan]

LGTM

[vrothberg]

In case we backport this to 2.0 (we I think we should) we need to cherry-pick commit a6f8586 first.

[vrothberg]

@baude @mheon PTAL

[mheon]

/lgtm

[vrothberg]

@mheon, can I backport or do we need a BZ?

[mheon]

At this point, we're very late in the cycle for 8.3 - we can talk at WC tomorrow, but if you think this is necessary we definitely need a BZ.

[vrothberg]

At this point, we're very late in the cycle for 8.3 - we can talk at WC tomorrow, but if you think this is necessary we definitely need a BZ.

Thanks! I created BZ 1876576 👍