Improve the cython buildout

component/cython_nogil/buildout.cfg

@@ -7,12 +7,18 @@ extends =
 parts =
   cython_nogil
 
+[cython]
+recipe = slapos.recipe.build:gitclone
+git-executable = ${git:location}/bin/git
+repository = https://lab.nexedi.com/Daetalus/cython.git
+revision = 21ffc32af0ae23a6bae2814934d16ef6853bf931
+location = ${buildout:parts-directory}/${:_buildout_section_name_}
+branch = nogil_extension
+
 [cython_nogil]
 recipe = plone.recipe.command
 stop-on-error = true
 update-command = true
-repository = https://lab.nexedi.com/Daetalus/cython.git
-location = ${buildout:parts-directory}/${:_buildout_section_name_}
-git-binary = ${git:location}/bin/git
+location = ${cython:location}
 python3-binary = ${python3.5:location}/bin/python3
-command = (([ -d ${:location} ] && (rm -rf ${:location}) || :) && ${:git-binary} clone --quiet ${:repository} ${:location} && cd ${:location} && ${:git-binary} checkout nogil_extension && ${:python3-binary} setup.py install && ${:python3-binary} test.py build_ext --inplace)
+command = (cd ${cython:location} && ${:python3-binary} setup.py install && ${:python3-binary} test.py build_ext --inplace)
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