pytest: fixed package requirements for latest setuptools which breaks backward compat.

pkgs/patches/pytest/setuptools.patch

@@ -0,0 +1,12 b''
+diff -rup pytest-4.6.5-orig/setup.py pytest-4.6.5/setup.py
+--- pytest-4.6.5-orig/setup.py	2018-04-10 10:23:04.000000000 +0200
++++  pytest-4.6.5/setup.py	2018-04-10 10:23:34.000000000 +0200
+@@ -24,7 +24,7 @@ INSTALL_REQUIRES = [
+ def main():
+     setup(
+         use_scm_version={"write_to": "src/_pytest/_version.py"},
+-        setup_requires=["setuptools-scm", "setuptools>=40.0"],
++        setup_requires=["setuptools-scm", "setuptools<=42.0"],
+         package_dir={"": "src"},
+         # fmt: off
+         extras_require={
  No newline at end of file

pkgs/python-packages-overrides.nix

@@ -1,281 +1,287 b''
 # Overrides for the generated python-packages.nix
 #
 # This function is intended to be used as an extension to the generated file
 # python-packages.nix. The main objective is to add needed dependencies of C
 # libraries and tweak the build instructions where needed.
 
 { pkgs
 , basePythonPackages
 }:
 
 let
   sed = "sed -i";
 
   localLicenses = {
     repoze = {
       fullName = "Repoze License";
       url =  http://www.repoze.org/LICENSE.txt;
     };
   };
 
 in
 
 self: super: {
 
   "appenlight-client" = super."appenlight-client".override (attrs: {
     meta = {
       license = [ pkgs.lib.licenses.bsdOriginal ];
     };
   });
 
   "beaker" = super."beaker".override (attrs: {
     patches = [
       ./patches/beaker/patch-beaker-lock-func-debug.diff
       ./patches/beaker/patch-beaker-metadata-reuse.diff
       ./patches/beaker/patch-beaker-improved-redis.diff
       ./patches/beaker/patch-beaker-improved-redis-2.diff
     ];
   });
 
   "cffi" = super."cffi".override (attrs: {
     buildInputs = [
       pkgs.libffi
     ];
   });
 
   "cryptography" = super."cryptography".override (attrs: {
     buildInputs = [
       pkgs.openssl
     ];
   });
 
   "gevent" = super."gevent".override (attrs: {
     propagatedBuildInputs = attrs.propagatedBuildInputs ++ [
       # NOTE: (marcink) odd requirements from gevent aren't set properly,
       # thus we need to inject psutil manually
       self."psutil"
     ];
   });
 
   "future" = super."future".override (attrs: {
     meta = {
       license = [ pkgs.lib.licenses.mit ];
     };
   });
 
   "testpath" = super."testpath".override (attrs: {
     meta = {
       license = [ pkgs.lib.licenses.mit ];
     };
   });
 
   "gnureadline" = super."gnureadline".override (attrs: {
     buildInputs = [
       pkgs.ncurses
     ];
     patchPhase = ''
       substituteInPlace setup.py --replace "/bin/bash" "${pkgs.bash}/bin/bash"
     '';
   });
 
   "gunicorn" = super."gunicorn".override (attrs: {
     propagatedBuildInputs = [
       # johbo: futures is needed as long as we are on Python 2, otherwise
       # gunicorn explodes if used with multiple threads per worker.
       self."futures"
     ];
   });
 
   "nbconvert" = super."nbconvert".override (attrs: {
     propagatedBuildInputs = attrs.propagatedBuildInputs ++ [
       # marcink: plug in jupyter-client for notebook rendering
       self."jupyter-client"
     ];
   });
 
   "ipython" = super."ipython".override (attrs: {
     propagatedBuildInputs = attrs.propagatedBuildInputs ++ [
       self."gnureadline"
     ];
   });
 
   "lxml" = super."lxml".override (attrs: {
     buildInputs = [
       pkgs.libxml2
       pkgs.libxslt
     ];
     propagatedBuildInputs = [
       # Needed, so that "setup.py bdist_wheel" does work
       self."wheel"
     ];
   });
 
   "mysql-python" = super."mysql-python".override (attrs: {
     buildInputs = [
       pkgs.openssl
     ];
     propagatedBuildInputs = [
       pkgs.libmysql
       pkgs.zlib
     ];
   });
 
   "psycopg2" = super."psycopg2".override (attrs: {
     propagatedBuildInputs = [
       pkgs.postgresql
     ];
     meta = {
       license = pkgs.lib.licenses.lgpl3Plus;
     };
   });
 
   "pycurl" = super."pycurl".override (attrs: {
     propagatedBuildInputs = [
       pkgs.curl
       pkgs.openssl
     ];
 
     preConfigure = ''
       substituteInPlace setup.py --replace '--static-libs' '--libs'
       export PYCURL_SSL_LIBRARY=openssl
     '';
 
     meta = {
       license = pkgs.lib.licenses.mit;
     };
   });
 
   "pyramid" = super."pyramid".override (attrs: {
     meta = {
       license = localLicenses.repoze;
     };
   });
 
   "pyramid-debugtoolbar" = super."pyramid-debugtoolbar".override (attrs: {
     meta = {
       license = [ pkgs.lib.licenses.bsdOriginal localLicenses.repoze ];
     };
   });
 
   "pysqlite" = super."pysqlite".override (attrs: {
     propagatedBuildInputs = [
       pkgs.sqlite
     ];
     meta = {
       license = [ pkgs.lib.licenses.zlib pkgs.lib.licenses.libpng ];
     };
   });
 
   "python-ldap" = super."python-ldap".override (attrs: {
     propagatedBuildInputs = attrs.propagatedBuildInputs ++ [
       pkgs.openldap
       pkgs.cyrus_sasl
       pkgs.openssl
     ];
   });
 
   "python-pam" = super."python-pam".override (attrs: {
     propagatedBuildInputs = [
         pkgs.pam
     ];
 
     # TODO: johbo: Check if this can be avoided, or transform into
     # a real patch
     patchPhase = ''
       substituteInPlace pam.py \
         --replace 'find_library("pam")' '"${pkgs.pam}/lib/libpam.so.0"'
     '';
 
     });
 
   "python-saml" = super."python-saml".override (attrs: {
     buildInputs = [
       pkgs.libxml2
       pkgs.libxslt
     ];
   });
 
   "dm.xmlsec.binding" = super."dm.xmlsec.binding".override (attrs: {
     buildInputs = [
       pkgs.libxml2
       pkgs.libxslt
       pkgs.xmlsec
       pkgs.libtool
     ];
   });
 
   "pyzmq" = super."pyzmq".override (attrs: {
     buildInputs = [
       pkgs.czmq
     ];
   });
 
   "urlobject" = super."urlobject".override (attrs: {
     meta = {
       license = {
         spdxId = "Unlicense";
         fullName = "The Unlicense";
         url = http://unlicense.org/;
       };
     };
   });
 
   "docutils" = super."docutils".override (attrs: {
     meta = {
       license = pkgs.lib.licenses.bsd2;
     };
   });
 
   "colander" = super."colander".override (attrs: {
     meta = {
       license = localLicenses.repoze;
     };
   });
 
   "pyramid-beaker"  = super."pyramid-beaker".override (attrs: {
     meta = {
       license = localLicenses.repoze;
     };
   });
 
   "pyramid-mako" = super."pyramid-mako".override (attrs: {
     meta = {
       license = localLicenses.repoze;
     };
   });
 
   "repoze.lru" = super."repoze.lru".override (attrs: {
     meta = {
       license = localLicenses.repoze;
     };
   });
 
   "python-editor" = super."python-editor".override (attrs: {
     meta = {
       license = pkgs.lib.licenses.asl20;
     };
   });
 
   "translationstring" = super."translationstring".override (attrs: {
     meta = {
       license = localLicenses.repoze;
     };
   });
 
   "venusian" = super."venusian".override (attrs: {
     meta = {
       license = localLicenses.repoze;
     };
   });
 
   "supervisor" = super."supervisor".override (attrs: {
     patches = [
       ./patches/supervisor/patch-rlimits-old-kernel.diff
     ];
   });
 
+  "pytest" = super."pytest".override (attrs: {
+    patches = [
+      ./patches/pytest/setuptools.patch
+    ];
+  });
+
   # Avoid that base packages screw up the build process
   inherit (basePythonPackages)
     setuptools;
 
 }