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Ian Wienand bfca36c772 Release 1.25.2 -----BEGIN PGP SIGNATURE----- iQEcBAABAgAGBQJYV1yqAAoJEBty/58O8cX8hLwIAKP66w6MdPN8PDgUOteui/Sx N0UFKJ9yR4GQOAP0NffPLjch5/g0iJLs3eFKOhtGC1LjbDjpVgjX8vW18ib8wBZK GemOZPF3uxg8FROrZF1vpoDy/cHgL1YV10hCnwdjN/r9rb8zOuSabqjW+Dennj2n fZ0SJfa8Owfudn3YxGuOymVb/wMtEloDmVGBEI1Y+h7osELCCDi3OXmwsA8qMsdl cTwbeugBs4PlOVbZUK/JKGuwIHKgPnDYzYu5KpXw77/MdjGT0fo5Tlq5AOBDI2sC 9JOFEBDli4Ro05VwvI58ADMpvvOax+9EvOhLbB1dRPdZl21Iyb6gOdy2PUbFO0c= =aKxq -----END PGP SIGNATURE----- Merge tag '1.25.2' into merge-branch Release 1.25.2 Change-Id: I698bcf2e82117bd81649cd065a7af5cac85990c7		2017-02-02 11:20:00 +11:00
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environment.d	Release 1.25.2	2017-02-02 11:20:00 +11:00
root.d	Move elements & lib relative to diskimage_builder package	2016-11-01 17:27:41 -07:00
README.rst	Move elements & lib relative to diskimage_builder package	2016-11-01 17:27:41 -07:00

README.rst

pip-cache

# Use a cache for pip

Using a download cache speeds up image builds.

Including this element in an image build causes $HOME/.cache/image-create/pip to be bind mounted as /tmp/pip inside the image build chroot. The $PIP_DOWNLOAD_CACHE environment variable is then defined as /tmp/pip, which causes pip to cache all downloads to the defined location.

Note that pip and its use of $PIP_DOWNLOAD_CACHE is not concurrency safe. Running multiple instances of diskimage-builder concurrently can cause issues. Therefore, it is advised to only have one instance of diskimage-builder that includes the pip-cache element running at a time.

The pip concurrency issue is being tracked upstream at https://github.com/pypa/pip/issues/1141