2015-02-07 10:30:02 +00:00
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=========
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pip-cache
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=========
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2013-08-14 18:12:15 +00:00
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# Use a cache for pip
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Using a download cache speeds up image builds.
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Including this element in an image build causes
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$HOME/.cache/image-create/pip to be bind mounted as /tmp/pip inside
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the image build chroot. The $PIP_DOWNLOAD_CACHE environment variable
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is then defined as /tmp/pip, which causes pip to cache all downloads
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to the defined location.
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Note that pip and its use of $PIP_DOWNLOAD_CACHE is not concurrency
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safe. Running multiple instances of diskimage-builder concurrently
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can cause issues. Therefore, it is advised to only have one instance
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of diskimage-builder that includes the pip-cache element running at a
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time.
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The pip concurrency issue is being tracked upstream at
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https://github.com/pypa/pip/issues/1141
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