[Distutils] setup_requires not caching downloaded packages?
zooko at zooko.com
Tue Jun 23 17:42:32 CEST 2009
What is the download cache?
I have a guess. If you are installing with the setuptools "install"
command, then the things which are "install_requires" get installed
into some target location, but things which are build_requires get
installed into the PWD. (If you don't specify a target, then it is
the system site-packages. In my build system , we typically don't
use "install" and instead use "develop" with a --prefix argument
which specifies the target. I assume virtualenv does something
Therefore, a later build will have its install_requires already
satisfied (if it is using the same installation target), but its
build_requirements will not be satisfied.
If that's what's going on then a solution might involve pre-
installing setuptools_bzr onto the build system, or patching
setuptools to specify a location for build requirements and re-using
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