Make /usr/bin/alembic point to alembic-3 on Fedora 31+

- Make /usr/bin/alembic point to alembic-3 on Fedora 31+
  See https://fedoraproject.org/wiki/Changes/Python_means_Python3
- Avoid absolute symlinks

python-alembic.spec

@@ -7,6 +7,16 @@
 %global with_python3 1
 %endif
 
+%if ( 0%{?fedora} >= 31 ) || ( 0%{?with_python2} == 0 )
+# link /usr/bin/alembic to /usr/bin/alembic-3
+# (https://fedoraproject.org/wiki/Changes/Python_means_Python3)
+%global python_version 3
+%else
+# link /usr/bin/alembic to /usr/bin/alembic-2
+%global python_version 2
+%endif
+
+
 %global modname alembic
 
 Name:             python-alembic
@@ -167,21 +177,23 @@ install -d -m 0755 %{buildroot}%{_mandir}/man1
 pushd %{py3dir}
 %{__python3} setup.py install --skip-build --root=%{buildroot}
 mv %{buildroot}/%{_bindir}/%{modname} %{buildroot}/%{_bindir}/%{modname}-3
-ln -s %{_bindir}/%{modname}-3 %{buildroot}/%{_bindir}/%{modname}-%{python3_version}
+ln -s %{modname}-3 %{buildroot}/%{_bindir}/%{modname}-%{python3_version}
 install -m 0644 alembic.1 %{buildroot}%{_mandir}/man1/alembic-3.1
-ln -s %{_mandir}/man1/alembic-3.1 %{buildroot}%{_mandir}/man1/alembic-%{python3_version}.1
+ln -s alembic-3.1 %{buildroot}%{_mandir}/man1/alembic-%{python3_version}.1
 popd
 %endif
 
 %if 0%{?with_python2}
 %{__python2} setup.py install -O1 --skip-build --root=%{buildroot}
-ln -s %{_bindir}/%{modname} %{buildroot}/%{_bindir}/%{modname}-2
+mv %{buildroot}/%{_bindir}/%{modname} %{buildroot}/%{_bindir}/%{modname}-2
-ln -s %{_bindir}/%{modname} %{buildroot}/%{_bindir}/%{modname}-%{python2_version}
+ln -s %{modname}-2 %{buildroot}/%{_bindir}/%{modname}-%{python2_version}
-install -m 0644 python2-alembic.1 %{buildroot}%{_mandir}/man1/alembic.1
+install -m 0644 python2-alembic.1 %{buildroot}%{_mandir}/man1/alembic-2.1
-ln -s %{_mandir}/man1/alembic.1 %{buildroot}%{_mandir}/man1/alembic-2.1
+ln -s alembic-2.1 %{buildroot}%{_mandir}/man1/alembic-%{python2_version}.1
-ln -s %{_mandir}/man1/alembic.1 %{buildroot}%{_mandir}/man1/alembic-%{python2_version}.1
 %endif
 
+ln -s %{modname}-%{python_version} %{buildroot}/%{_bindir}/%{modname}
+ln -s alembic-%{python_version}.1 %{buildroot}%{_mandir}/man1/alembic.1
+
 %if 0%{?rhel} && 0%{?rhel} <= 6
 # Modify /usr/bin/alembic to require SQLAlchemy>=0.6
 # Hacky but setuptools only creates this file after setup.py install is run :-(
@@ -209,13 +221,17 @@ popd
 %doc README.rst LICENSE CHANGES docs
 %{python2_sitelib}/%{modname}/
 %{python2_sitelib}/%{modname}-%{version}*
+%if %{python_version} == 2
 %{_bindir}/%{modname}
+%endif
 %{_bindir}/%{modname}-2
 %{_bindir}/%{modname}-%{python2_version}
 
 %if 0%{?rhel} && 0%{?rhel} <= 6
 %else
+%if %{python_version} == 2
 %{_mandir}/man1/alembic.1*
+%endif
 %{_mandir}/man1/alembic-2.1*
 %{_mandir}/man1/alembic-%{python2_version}.1*
 %endif
@@ -226,6 +242,10 @@ popd
 %doc LICENSE README.rst CHANGES docs
 %{python3_sitelib}/%{modname}/
 %{python3_sitelib}/%{modname}-%{version}-*
+%if %{python_version} == 3
+%{_bindir}/%{modname}
+%{_mandir}/man1/alembic.1*
+%endif
 %{_bindir}/%{modname}-3
 %{_bindir}/%{modname}-%{python3_version}
 %{_mandir}/man1/alembic-3.1*
@@ -234,6 +254,11 @@ popd
 
 
 %changelog
+* Mon Jul 22 2019 Petr Viktorin <pviktori@redhat.com> - 1.0.11-2
+- Make /usr/bin/alembic point to alembic-3 on Fedora 31+
+  See https://fedoraproject.org/wiki/Changes/Python_means_Python3
+- Avoid absolute symlinks
+
 * Sun Jun 30 2019 Kevin Fenzi <kevin@scrye.com> - 1.0.11-1
 - Update to 1.0.11. Fixes bug #1723981