pull: fix content blobs deletion on pull race #1013
Merged
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This fixes a race where gc cleans up a ref that holds the same blob that is pulled by another ref. Now blobs are kept by a lease during pull, avoiding containerd for cleaning them up. And inserting a blob mapping recreates the root label.
fixes #992 (traces in #991)
@dmcgowan @AkihiroSuda @msg555
Signed-off-by: Tonis Tiigi tonistiigi@gmail.com