dev-python/flask-cors/flask-cors-9999.ebuild: Use local intersphinx

Gentoo's python-docs recently learned how to install objects.inv (with
the 2.7.6, 3.3.5, and 3.4.0 ebuilds, but without a revbump [1]).
Avoid the troublesome web access [2,3]:

  loading intersphinx inventory from http://docs.python.org/objects.inv...

Unfortunately, the approach to locating the local objects.inv is a bit
awkward.  Ideally there would be some sort of pkg-config approach to
listing a package's HTML doc directory :p, but until then the best I
can do is shell out to ls with an EROOT-based glob.  Using ROOT in
ebuild functions is illegal though [4] (and by extension, using it via
EROOT may be illegal as well).  Even if it was legal, you're going to
run into trouble if the python-docs dependency was installed with a
different ROOT, which is why I die if PYTHON_DOC is empty.

[1]: https://bugs.gentoo.org/show_bug.cgi?id=521768
     Summary: dev-python/python-docs-3.4.0 doesn't install objects.inv
       for intersphinx
[2]: https://bugs.gentoo.org/show_bug.cgi?id=522064
     Summary: should explicitly disallow network access from existing
       ebuild functions
[3]: https://github.com/gentoo/devmanual.gentoo.org/pull/21
     Summary: ebuild-writing/functions: Don't allow network access
[4]: http://devmanual.gentoo.org/ebuild-writing/common-mistakes/#invalid-use-of-root

diff --git a/dev-python/flask-cors/flask-cors-9999.ebuild b/dev-python/flask-cors/flask-cors-9999.ebuild
index 5bc0f95a37bf67385a34b82ff383ac9171fc8274..0534d2b2ef1cf43ff73113148fc224e43e6046f0 100644 (file)
--- a/dev-python/flask-cors/flask-cors-9999.ebuild
+++ b/dev-python/flask-cors/flask-cors-9999.ebuild
@@ -32,6 +32,7 @@ DEPEND="
        dev-python/setuptools[${PYTHON_USEDEP}]
        doc? (
                ${RDEPEND}
+               dev-python/python-docs[${PYTHON_USEDEP}]
                dev-python/sphinx_rtd_theme[${PYTHON_USEDEP}]
        )
        test? (
@@ -41,6 +42,22 @@ DEPEND="
 
 S="${WORKDIR}/${MY_P}"
 
+python_prepare_all() {
+       if use doc; then
+               local PYTHON_DOC_INVENTORIES=$(ls "${EROOT}usr/share/doc"/python-docs-*/html/objects.inv)
+               local PYTHON_DOC_INVENTORY="${PYTHON_DOC_INVENTORIES##*
+}"
+               local PYTHON_DOC="${PYTHON_DOC_INVENTORY##${ROOT%/}}"
+               PYTHON_DOC="${PYTHON_DOC%%objects.inv}"
+               if [[ -z "${PYTHON_DOC}" ]]
+               then
+                       die "python-docs not found in ${EROOT}usr/share/doc"
+               fi
+               sed -i "s|'http://docs.python.org/': None|'${PYTHON_DOC}': '${PYTHON_DOC_INVENTORY}'|" docs/conf.py || die
+       fi
+       distutils-r1_python_prepare_all
+}
+
 python_compile_all() {
        use doc && emake -C docs html
 }