Cherry pick the Image loader optimization from the NSDI AE#409
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Signed-off-by: Tyler Gu <jiaweig3@illinois.edu>
Signed-off-by: Tyler Gu <jiaweig3@illinois.edu>
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Keep all image archives in a centralized place under the Acto project directory, so that the archives are not repeatedly pulled and created.
We use a file lock for each archive to prevent race condition when Acto runs in multi-processing mode.
Each image archive is created with
{hash}.tarwhere the hash is computed based on the image names in the archive.The image archives are stored in the
{acto_repo}/.acto_images.