Save bazel and python caches out of home dir

[sustrik]

This decreases the size of scion image by ~1/2 GB

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This change is 

[worxli]

Reviewed 3 of 3 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved

[kormat]

Reviewed 3 of 3 files at r1.
Reviewable status: all files reviewed, 2 unresolved discussions (waiting on @sustrik)

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docker/Dockerfile, line 24 at r1 (raw file):

# Restore the python dependency cache from scion_base
RUN sudo tar xf /scion/cache/python_local.tar.gz -C ~

Why is sudo required?

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docker/Dockerfile.base, line 48 at r1 (raw file):

    env/pip2/deps; \
    env/pip3/deps; \
    sudo mkdir -p /scion/cache; \

Ah, i was suggesting /scioncache, i'm not sure we need a hierarchy.

I would also move this step to its own RUN, so reordering pip vs bazel doesn't break things.

[sustrik]

Reviewable status: 1 of 3 files reviewed, 2 unresolved discussions (waiting on @kormat and @worxli)

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docker/Dockerfile, line 24 at r1 (raw file):

Previously, kormat (Stephen Shirley) wrote…

Why is sudo required?

Done.

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docker/Dockerfile.base, line 48 at r1 (raw file):

Previously, kormat (Stephen Shirley) wrote…

Ah, i was suggesting /scioncache, i'm not sure we need a hierarchy.

I would also move this step to its own RUN, so reordering pip vs bazel doesn't break things.

Done.

[kormat]

Reviewed 3 of 3 files at r2.
Reviewable status: complete! all files reviewed, all discussions resolved