Allow setting $TMPDIR to $PWD/... during pip wheel

Needed for https://bugzilla.redhat.com/show_bug.cgi?id=1806625

python-pip.spec

@@ -16,7 +16,7 @@ Name:           python-%{srcname}
 # When updating, update the bundled libraries versions bellow!
 # You can use vendor_meta.sh in the dist git repo
 Version:        20.0.2
-Release:        2%{?dist}
+Release:        3%{?dist}
 Summary:        A tool for installing and managing Python packages
 
 # We bundle a lot of libraries with pip, which itself is under MIT license.
@@ -94,6 +94,11 @@ Patch4:         dummy-certifi.patch
 # this warning is juts moot. Also, the warning breaks CPython test suite.
 Patch5:         nowarn-pip._internal.main.patch
 
+# Allow setting $TMPDIR to $PWD/... during pip wheel
+# This is needed to have proper debugsource packages with pyproject-rpm-macros
+# https://bugzilla.redhat.com/show_bug.cgi?id=1806625
+Patch6:         https://github.com/pypa/pip/pull/7873.patch
+
 # Downstream only patch
 # Users might have local installations of pip from using
 # `pip install --user --upgrade pip` on older/newer versions.
@@ -253,6 +258,7 @@ popd
 %patch3 -p1
 %patch4 -p1
 %patch5 -p1
+%patch6 -p1
 
 # this goes together with patch4
 rm src/pip/_vendor/certifi/*.pem
@@ -379,6 +385,9 @@ ln -sf %{buildroot}%{_bindir}/pip3 _bin/pip
 %{python_wheeldir}/%{python_wheelname}
 
 %changelog
+* Fri Apr 10 2020 Miro Hrončok <mhroncok@redhat.com> - 20.0.2-3
+- Allow setting $TMPDIR to $PWD/... during pip wheel (#1806625)
+
 * Tue Mar 10 2020 Miro Hrončok <mhroncok@redhat.com> - 20.0.2-2
 - Don't warn the user about pip._internal.main() entrypoint to fix ensurepip