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With the Modularity effort a minimal stack of Python only needed to run dnf is needed to be part of the Platform. Changing System/Platform Python to be a separate stack will allow us to do that. In the future that allows us to have different version of Python in platform and in the "Python 3" module. | With the Modularity effort a minimal stack of Python only needed to run dnf is needed to be part of the Platform. Changing System/Platform Python to be a separate stack will allow us to do that. In the future that allows us to have different version of Python in platform and in the "Python 3" module. | ||
TODO: The Modularity team to extend this section. | |||
<!-- What is the benefit to the platform? If this is a major capability update, what has changed? If this is a new functionality, what capabilities does it bring? Why will Fedora become a better distribution or project because of this proposal?--> | <!-- What is the benefit to the platform? If this is a major capability update, what has changed? If this is a new functionality, what capabilities does it bring? Why will Fedora become a better distribution or project because of this proposal?--> |
Revision as of 08:46, 20 July 2017
Platform Python Stack
Summary
A revisit of the System Python change from Fedora 24. It has been renamed from System Python to Platform Python not to collide with upstream PEP 432.
Platform Python will be a separate stack fo Python packages aimed to provide all necessary dependencies to run and build dnf. In Fedora 27 this will be Python 3.6 (same version as python3
, but this might change in the future with the Modularity effort).
Owner
- Name: Miro Hrončok
- Email: <python-maint at redhat.com>
- Release notes owner:
Current status
- Targeted release: Fedora 27
- Last updated: 2017-07-20
- Tracker bug: <will be assigned by the Wrangler>
Detailed Description
The changes made during the System Python change from Fedora 24 will be reverted.
A new platform-python (source) package will be created as a copy of the python3
package. Unlike python3, it will be changed so that:
- the location of files will not be
/usr/lib/python3.6/
but/usr/lib/platform-python/
- the script that generates the
python(abi)
requirement will be adapted to generateplatform-python(abi)
requirement for that location
- the script that generates the
- the location of the binary will be
/usr/libexec/platform-python
- all the macros will use the platform python binary and will be renamed
- all subpackages will be named
platform-python-*
- the debug build will be disabled
- the modules that are (before this change) not part of
system-python-libs
but ratherpython3-libs
will relocate toplatform-python-libs-devel
to be available only on build-time platform-python-libs
will provideplatform-python(abi)
instead ofpython(abi)
Several packages (see bellow) will introduce a new platform-python-
subpackage. Example specfile of such package:
%global pypi_name foo Name: python-%{pypi_name} Version: 0.13 Release: 1%{?dist} Summary: Python %{pypi_name} module License: GPLv2 URL: https://github.com/fedora-python/%{pypi_name} Source0: https://files.pythonhosted.org/packages/source/f/%{pypi_name}/%{pypi_name}-%{version}.tar.gz BuildRequires: python2-devel BuildRequires: python2-setuptools BuildRequires: python3-devel BuildRequires: python3-setuptools BuildRequires: platform-python-devel BuildRequires: platform-python-setuptools BuildArch: noarch %description ... %package -n python2-%{pypi_name} Summary: %{summary} Requires: python2-bar %{?python_provide:%python_provide python2-%{pypi_name}} %description -n python2-%{pypi_name} ... %package -n python3-%{pypi_name} Summary: %{summary} Requires: python3-bar %{?python_provide:%python_provide python3-%{pypi_name}} %description -n python3-%{pypi_name} ... %package -n platform-python-%{pypi_name} Summary: %{summary} Requires: platform-python-bar %description -n platform-python-%{pypi_name} ... %prep %autosetup -n %{pypi_name}-%{version} %build %py2_build %py3_build %plpy_build %install %py2_install rm %{buildroot}%{_bindir}/%{pypi_name} %plpy_install rm %{buildroot}%{_bindir}/%{pypi_name} %py3_install %check export PYTHONPATH=%{buildroot}%{python2_sitelib} %{__python2} -m unittest discover -v export PYTHONPATH=%{buildroot}%{python3_sitelib} %{__python3} -m unittest discover -v export PYTHONPATH=%{buildroot}%{platformpython_sitelib} %{__platformpython} -m unittest discover -v %files -n python2-%{pypi_name} %doc README.rst CHANGES.rst %license COPYING %{python2_sitelib}/%{pypi_name}.so %{python2_sitelib}/%{pypi_name}-%{version}-py?.?.egg-info %files -n python3-%{pypi_name} %doc README.rst CHANGES.rst %license COPYING %{_bindir}/%{pypi_name} %{python3_sitelib}/%{pypi_name}.cpython-%{python3_version_nodots}*.so %{python3_sitelib}/%{pypi_name}-%{version}-py?.?.egg-info %files -n platform-python-%{pypi_name} %doc README.rst CHANGES.rst %license COPYING %{platformpython_sitelib}/%{pypi_name}.cpython-%{platformplatformpython_version_nodots}*.so %{platformpython_sitelib}/%{pypi_name}-%{version}-py?.?.egg-info %changelog ...
The complete list of affected packages is not final yet. It should be all the Python build dependencies of dnf and their build dependencies as well, excluding packages only needed to build the documentation (normal python3- (or even python2-) packages will be used to build the documentation as it is now).
Currently, we have established this as a list of packages:
dbus-python gpgme libcomps libdnf librepo pytest python-argcomplete python-cffi python-contextlib2 python-coverage python-cryptography python-decorator python-extras python-fixtures python-funcsigs python-hypothesis python-idna python-iniparse python-jinja2 python-jsonschema python-keyring python-linecache2 python-markupsafe python-mimeparse python-mock python-nose python-pbr python-pexpect python-pip python-ply python-ptyprocess python-py python-pyasn1 python-pycparser python-pygpgme python-pytest-timeout python-rpm-macros python-SecretStorage python-setuptools python-setuptools_scm python-six python-testtools python-traceback2 python-unittest2 python-wheel pyxattr pyxdg rpm
Only the following list will be installable from the platform module (the rest is merely meant as a build dependency):
platform-python platform-python-dnf platform-python-gpg platform-python-hawkey platform-python-iniparse platform-python-libcomps platform-python-librepo platform-python-libs platform-python-pyparsing platform-python-rpm platform-python-six
(And other subpackages from their source RPMs needed as dependencies for those, such as gpgme etc.)
Benefit to Fedora
With the Modularity effort a minimal stack of Python only needed to run dnf is needed to be part of the Platform. Changing System/Platform Python to be a separate stack will allow us to do that. In the future that allows us to have different version of Python in platform and in the "Python 3" module.
TODO: The Modularity team to extend this section.
Scope
- Proposal owners:
- identify a list of runtime and build dependencies of dnf
- create a
platform-python
source package - change the script that generates the
python(abi)
requirements to also generateplatform-python(abi)
requirements - revert system-python related things from the
python3
package (add appropriate provides/obsoletes) - add a
platform-python-
subpackage to identified list of packages - switch dnf to use that stack
- Other developers: N/A (not a System Wide Change)
- Release engineering: #Releng issue number (a check of an impact with Release Engineering is needed)
- List of deliverables: N/A (not a System Wide Change)
- Policies and guidelines: N/A (not a System Wide Change)
- Trademark approval: N/A (not needed for this Change)
Upgrade/compatibility impact
N/A (not a System Wide Change)
How To Test
N/A (not a System Wide Change)
User Experience
Nothing should change for the user, except a slightly larger amount of packages will be installed on the system.
Dependencies
N/A (not a System Wide Change)
Contingency Plan
- Contingency mechanism: (What to do? Who will do it?) N/A (not a System Wide Change)
- Contingency deadline: N/A (not a System Wide Change)
- Blocks release? No (not a System Wide Change)
- Blocks product? No
If not done on time: Keep dnf running on python3
. Finish the work in time of Fedora 28.
If proven not to work as designed: Retire platform-python package and remove all the platform-python- subpackages. Provide/obsolete platform-python- subpackages from their python3- counterparts.
Documentation
N/A (not a System Wide Change)