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0c511e068b
mounts() moved `first` to the merged fsmeta mount's index whenever mountFsMeta matched, collapsing the overlay's lowerdir range to the fsmeta alone and dropping any plain lowers already appended above it. When fsmerge was added, fsmeta was only ever written for the top parent of the chain being prepared, so the loop matched at i == 0, where first already equalled the fsmeta's index and the reassignment was a no-op. It only mattered once the fsmeta could sit below the top parent, i.e. a chain extending an already-merged sub-chain. The snapshotter no longer generates fsmeta itself, so today this only affects externally supplied fsmeta files. first only marks the start of the lowerdir range, so it must stay at the first lower's index. Signed-off-by: Derek McGowan <derek@mcg.dev>