[packaging] add spec file for centos

cubicweb-activitystream.spec

+# for el5, force use of python2.6
+%if 0%{?el5}
+%define python python26
+%define __python /usr/bin/python2.6
+%else
+%define python python
+%define __python /usr/bin/python
+%endif
+%{!?_python_sitelib: %define _python_sitelib %(%{__python} -c "from distutils.sysconfig import get_python_lib; print get_python_lib()")}
+
+Name:           cubicweb-activitystream
+Version:        0.1.2
+Release:        logilab.1%{?dist}
+Summary:        activity streams component for the CubicWeb framework
+Group:          Applications/Internet
+License:        LGPL
+Source0:        cubicweb-activitystream-%{version}.tar.gz
+
+BuildArch:      noarch
+BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-buildroot
+
+BuildRequires:  %{python} %{python}-setuptools
+Requires:       cubicweb >= 3.10.8
+
+%description
+activity streams component for the CubicWeb framework
+
+%prep
+%setup -q -n cubicweb-activitystream-%{version}
+%if 0%{?el5}
+# change the python version in shebangs
+find . -name '*.py' -type f -print0 |  xargs -0 sed -i '1,3s;^#!.*python.*$;#! /usr/bin/python2.6;'
+%endif
+
+%install
+NO_SETUPTOOLS=1 %{__python} setup.py --quiet install --no-compile --prefix=%{_prefix} --root="$RPM_BUILD_ROOT"
+# remove generated .egg-info file
+rm -rf $RPM_BUILD_ROOT/usr/lib/python*
+
+
+%clean
+rm -rf $RPM_BUILD_ROOT
+
+%files
+%defattr(-, root, root)
+/*