Bug#872259: sagemath: FTBFS with Sphinx 1.6: TypeError: frompickle() takes exactly 3 arguments (4 given)

[Dmitry Shachnev]

Source: sagemath
Version: 7.6-3
Severity: important
User: python-modules-team at lists.alioth.debian.org
Usertags: sphinx1.6

Dear maintainer,

sagemath fails to build with Sphinx 1.6, currently available in experimental:

  [dochtml] Building reference manual, first pass.
  [dochtml]
  [dochtml] Error building the documentation.
  [dochtml] Traceback (most recent call last):
  [...]
  [dochtml]   File "/<<PKGBUILDDIR>>/debian/build/usr/lib/python2.7/dist-packages/sage_setup/docbuild/__init__.py", line 510, in _wrapper
  [dochtml]     build_many(build_ref_doc, L)
  [dochtml]   File "/<<PKGBUILDDIR>>/debian/build/usr/lib/python2.7/dist-packages/sage_setup/docbuild/__init__.py", line 266, in build_many
  [dochtml]     results.append(target(arg))
  [dochtml]   File "/<<PKGBUILDDIR>>/debian/build/usr/lib/python2.7/dist-packages/sage_setup/docbuild/__init__.py", line 70, in build_ref_doc
  [dochtml]     getattr(ReferenceSubBuilder(doc, lang), format)(*args, **kwds)
  [dochtml]   File "/<<PKGBUILDDIR>>/debian/build/usr/lib/python2.7/dist-packages/sage_setup/docbuild/__init__.py", line 705, in _wrapper
  [dochtml]     for module_name in self.get_modified_modules():
  [dochtml]   File "/<<PKGBUILDDIR>>/debian/build/usr/lib/python2.7/dist-packages/sage_setup/docbuild/__init__.py", line 834, in get_modified_modules
  [dochtml]     env = self.get_sphinx_environment()
  [dochtml]   File "/<<PKGBUILDDIR>>/debian/build/usr/lib/python2.7/dist-packages/sage_setup/docbuild/__init__.py", line 779, in get_sphinx_environment
  [dochtml]     env = BuildEnvironment.frompickle(self.dir, config, env_pickle)
  [dochtml] TypeError: frompickle() takes exactly 3 arguments (4 given)
  Makefile:1093: recipe for target 'doc-html' failed

This looks like a result of upstream commit [1], where the signature of
frompickle method changed from:

  def frompickle(cls, srcdir, config, filename):

to:

  def frompickle(cls, filename, app):

The full build log is available at [2] (it is from Ubuntu, but there should
be no difference with Debian).

[1]: https://github.com/sphinx-doc/sphinx/commit/c7bec75bcd12530a
[2]: https://launchpadlibrarian.net/333317873/buildlog_ubuntu-artful-amd64.sagemath_7.6-3ubuntu3_BUILDING.txt.gz

--
Dmitry Shachnev
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