%define python_version 3.7.12

Version: %{python_version}
Summary: Python %{python_version} from straightforward source build
Name: clean_python37
Release: 1
License: Python
Group: Development/Languages
Source0: https://www.python.org/ftp/python/%{version}/Python-%{version}.tgz
AutoReqProv: no

requires: bzip2
requires: gdbm
requires: glibc
requires: gmp
requires: libgcc
requires: libstdc++
requires: ncurses
requires: openssl
requires: readline
requires: xz-libs
requires: zlib

BuildRequires: bzip2-devel
BuildRequires: gdbm-devel
BuildRequires: libffi-devel
BuildRequires: ncurses-devel
BuildRequires: openssl-devel
BuildRequires: readline-devel
BuildRequires: sqlite-devel
BuildRequires: xz-devel
BuildRequires: zlib-devel

BuildRoot: /tmp/%{name}

%description
A clean python

%prep
%setup -n Python-%{version}

%build
rm -rf %{buildroot}
./configure --enable-ipv6 --enable-unicode=ucs2 --enable-shared \
  --prefix=/opt/%{name}/%{version}

make LDFLAGS="$LDFLAGS -Wl,-rpath=/opt/%{name}/%{version}/lib"
make install DESTDIR=$RPM_BUILD_ROOT

find %{buildroot}/opt/%{name}/%{version}/lib -name '*.py[oc]' -exec rm {} \;

mkdir -p %{buildroot}/etc/ld.so.conf.d
cat << EOF | tee %{buildroot}/etc/ld.so.conf.d/%{name}.conf
/opt/%{name}/%{version}/lib
EOF

%post
alternatives \
  --install /usr/bin/python3 python3 /opt/%{name}/%{version}/bin/python3 1 \
  --slave /usr/bin/pip3 pip3 /opt/%{name}/%{version}/bin/pip3

ldconfig -v

%postun
alternatives \
  --remove python3 /opt/%{name}/%{version}/bin/python3

ldconfig -v

%files
%attr(-, root, root) /opt/%{name}/%{version}
%attr(-, root, root) /etc/ld.so.conf.d/%{name}.conf