commit: Make base read-only if there is an early failure
You can reproduce this by passing an invalid filter-node-name (like "1234") to block-commit. In this case the base image is put in read-write mode but is never reset back to read-only. Signed-off-by: NAlberto Garcia <berto@igalia.com> Reviewed-by: NMax Reitz <mreitz@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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