Nalin Dahyabhai b2baeb25f4 Take a shortcut when writing to local storage ...

When writing to local storage, take a couple of shortcuts: instead of
recompressing layers to ensure that the values we store in the image
manifest will be correct for content-addressibility, just pretend that
the layer ID is a blob hash value, and that it's a valid layer diffID.

Local storage doesn't generally care if these values are correct, and we
already have to recompute these values when exporting an image, but this
saves us quite a bit of time.

The image library's Copy() routine actually cares about and
sanity-checks these things, so if we're going to take advantage of the
shortcuts, we need to use its higher-level APIs to write a layer, write
the configuration, and write the manifest, then move those items that it
writes to an image with the right set of layers.

Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>

Closes: #141
Approved by: rhatdan

2017-06-13 21:50:42 +00:00

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