Add a diff service to Overlaybd snapshotter#21
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This diff service identifies whether the Compare function is operating on overlaybd devices, and if so, attempts to call overlaybd-commit on the writable_data and writable_index of the upper layer, efficiently generating a blob for the writable layer. This is much faster than the default diff service, which mounts the block devices and compares the filesystem's file-by-file, which generates an OCI tar which we then convert to overlaybd.
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This diff service identifies whether the Compare function is operating on overlaybd devices, and if so, attempts to call overlaybd-commit on the writable_data and writable_index of the upper layer, efficiently generating a blob for the writable layer.
This is much faster than the default diff service, which mounts the block devices and compares the filesystem's file-by-file, which generates an OCI tar which we then convert to overlaybd.