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<!-- The actual name of your proposed change page should look something like: Changes/Your_Change_Proposal_Name.  This keeps all change proposals in the same namespace -->
<!-- The actual name of your proposed change page should look something like: Changes/Your_Change_Proposal_Name.  This keeps all change proposals in the same namespace -->
= Platform Python Stack <!-- The name of your change proposal --> =
= Platform Python Stack <!-- The name of your change proposal --> =
{{admon/important|Reverted|This change was reverted, because it was a bad idea entirely. See RHBZ#1483342 and the link below this box.}}
https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/thread/SEFUWW4XZBTVOAQ36XOJQ72PIICMFOSN/


== Summary ==
== Summary ==
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A revisit of the [[Changes/System Python|System Python]] change from [[Releases/24 | Fedora 24]]. It has been renamed from '''System Python''' to '''Platform Python''' not to collide with upstream [https://www.python.org/dev/peps/pep-0432/#a-system-python-executable PEP 432].
A revisit of the [[Changes/System Python|System Python]] change from [[Releases/24 | Fedora 24]]. It has been renamed from '''System Python''' to '''Platform Python''' not to collide with upstream [https://www.python.org/dev/peps/pep-0432/#a-system-python-executable PEP 432].


Platform Python will be a separate stack fo Python packages living in the Platform module aimed to provide all necessary dependencies to run and build dnf. In [[Releases/27 | Fedora 27]] this will be Python 3.6 (same version as {{package|python3}}, but this might change in the future with the Modularity effort).
Platform Python will be a separate stack fo Python packages aimed to provide all necessary dependencies to run and build dnf. In [[Releases/27 | Fedora 27]] this will be Python 3.6 (same version as {{package|python3}}, but this might change in the future with the Modularity effort).


== Owner ==
== Owner ==
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-->
-->
* Name: [[User:Churchyard|Miro Hrončok]]
* Name: [[User:Churchyard|Miro Hrončok]]
* Name: [[User:Cstratak|Charalampos Stratakis]]
* Name: [[User:Torsava|Tomáš Orsava]]
<!-- Include you email address that you can be reached should people want to contact you about helping with your change, status is requested, or technical issues need to be resolved. If the change proposal is owned by a SIG, please also add a primary contact person. -->
<!-- Include you email address that you can be reached should people want to contact you about helping with your change, status is requested, or technical issues need to be resolved. If the change proposal is owned by a SIG, please also add a primary contact person. -->
* Email: <python-maint at redhat.com>
* Email: <python-maint at redhat.com>
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CLOSED as NEXTRELEASE -> change is completed and verified and will be delivered in next release under development
CLOSED as NEXTRELEASE -> change is completed and verified and will be delivered in next release under development
-->
-->
* Tracker bug: <will be assigned by the Wrangler>
* Tracker bug: [https://bugzilla.redhat.com/show_bug.cgi?id=1479272 #1479272]


== Detailed Description ==
== Detailed Description ==
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The changes made during the [[Changes/System Python|System Python]] change from [[Releases/24 | Fedora 24]] will be reverted.
The changes made during the [[Changes/System Python|System Python]] change from [[Releases/24 | Fedora 24]] will be reverted.


A new platform-python (source) package will be created as a copy of python3 package. Unlike python3, it will be changed so that:
A new platform-python (source) package will be created as a copy of the {{package|python3}} package. Unlike python3, it will be changed so that:


* the location of files will not be <code>/usr/lib/python3.6/</code> but <code>/usr/lib/platform-python/</code>
* the location of files will not be <code>/usr/lib/python3.6/</code> but <code>/usr/lib/platform-python3.6/</code>
** the script that generates the <code>python(abi)</code> requirement will be adapted to generate <code>platform-python(abi)</code> requirement for that location
** the script that generates the <code>python(abi)</code> requirement will be adapted to generate <code>platform-python(abi)</code> requirement for that location
* the location of the binary will be <code>/usr/libexec/platform-python</code>
* the location of the binary will be <code>/usr/libexec/platform-python</code>
Line 74: Line 79:
* all subpackages will be named <code>platform-python-*</code>
* all subpackages will be named <code>platform-python-*</code>
* the debug build will be disabled
* the debug build will be disabled
* the modules that are (before this change) not part of <code>platform-python-libs</code> but rather <code>python3-libs</code> will relocate to <code>platform-python-libs-devel</code> to be available only on build-time
* the modules that are (before this change) not part of <code>system-python-libs</code> but rather <code>python3-libs</code> will relocate to <code>platform-python-libs-devel</code> to be available only on build-time
* <code>platform-python-libs</code> will provide <code>platform-python(abi)</code> instead of <code>python(abi)</code>
* <code>platform-python</code> will provide <code>platform-python(abi)</code> instead of <code>python(abi)</code>


Several packages (see bellow) will introduce a new <code>platform-python-</code> subpackage. Example specfile of such package:
Several packages (see bellow) will introduce a new <code>platform-python-</code> subpackage. Example specfile of such package:


  %global pypi_name foo
  %global pypi_name foo
%bcond_without python2
%bcond_without python3
%bcond_without platform_python
   
   
  Name:          python-%{pypi_name}
  Name:          python-%{pypi_name}
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  Source0:        https://files.pythonhosted.org/packages/source/f/%{pypi_name}/%{pypi_name}-%{version}.tar.gz
  Source0:        https://files.pythonhosted.org/packages/source/f/%{pypi_name}/%{pypi_name}-%{version}.tar.gz
   
   
%if %{with python2}
  BuildRequires:  python2-devel
  BuildRequires:  python2-devel
  BuildRequires:  python2-setuptools
  BuildRequires:  python2-setuptools
%endif
   
   
%if %{with python3}
  BuildRequires:  python3-devel
  BuildRequires:  python3-devel
  BuildRequires:  python3-setuptools
  BuildRequires:  python3-setuptools
%endif
   
   
%if %{with platform_python}
  BuildRequires:  platform-python-devel
  BuildRequires:  platform-python-devel
  BuildRequires:  platform-python-setuptools
  BuildRequires:  platform-python-setuptools
%endif
   
   
  BuildArch:      noarch
  BuildArch:      noarch
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  ...
  ...
   
   
%if %{with python2}
  %package -n    python2-%{pypi_name}
  %package -n    python2-%{pypi_name}
  Summary:        %{summary}
  Summary:        %{summary}
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  %description -n python2-%{pypi_name}
  %description -n python2-%{pypi_name}
  ...
  ...
%endif
   
   
%if %{with python3}
  %package -n    python3-%{pypi_name}
  %package -n    python3-%{pypi_name}
  Summary:        %{summary}
  Summary:        %{summary}
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  %description -n python3-%{pypi_name}
  %description -n python3-%{pypi_name}
  ...
  ...
%endif
   
   
   
   
%if %{with platform_python}
  %package -n    platform-python-%{pypi_name}
  %package -n    platform-python-%{pypi_name}
  Summary:        %{summary}
  Summary:        %{summary}
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  %description -n platform-python-%{pypi_name}
  %description -n platform-python-%{pypi_name}
  ...
  ...
%endif
   
   
   
   
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  %build
  %build
%if %{with python2}
  %py2_build
  %py2_build
%endif
%if %{with python3}
  %py3_build
  %py3_build
  %plpy_build
  %endif
%if %{with platform_python}
%platform_py_build
%endif
   
   
  %install
  %install
%if %{with python2}
  %py2_install
  %py2_install
  rm %{buildroot}%{_bindir}/%{pypi_name}
  rm %{buildroot}%{_bindir}/%{pypi_name}
%endif
   
   
  %plpy_install
  %if %{with platform_python}
%platform_py_install
  rm %{buildroot}%{_bindir}/%{pypi_name}
  rm %{buildroot}%{_bindir}/%{pypi_name}
%endif
   
   
%if %{with python3}
  %py3_install
  %py3_install
%endif
   
   
   
   
  %check
  %check
%if %{with python2}
  export PYTHONPATH=%{buildroot}%{python2_sitelib}
  export PYTHONPATH=%{buildroot}%{python2_sitelib}
  %{__python2} -m unittest discover -v
  %{__python2} -m unittest discover -v
%endif
   
   
%if %{with python3}
  export PYTHONPATH=%{buildroot}%{python3_sitelib}
  export PYTHONPATH=%{buildroot}%{python3_sitelib}
  %{__python3} -m unittest discover -v
  %{__python3} -m unittest discover -v
%endif
   
   
  export PYTHONPATH=%{buildroot}%{platformpython_sitelib}
%if %{with platform_python}
  %{__platformpython} -m unittest discover -v
  export PYTHONPATH=%{buildroot}%{platform_python_sitelib}
  %{__platform_python} -m unittest discover -v
%endif
   
   
   
   
%if %{with python2}
  %files -n python2-%{pypi_name}
  %files -n python2-%{pypi_name}
  %doc README.rst CHANGES.rst
  %doc README.rst CHANGES.rst
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  %{python2_sitelib}/%{pypi_name}.so
  %{python2_sitelib}/%{pypi_name}.so
  %{python2_sitelib}/%{pypi_name}-%{version}-py?.?.egg-info
  %{python2_sitelib}/%{pypi_name}-%{version}-py?.?.egg-info
%endif
   
   
%if %{with python3}
  %files -n python3-%{pypi_name}
  %files -n python3-%{pypi_name}
  %doc README.rst CHANGES.rst
  %doc README.rst CHANGES.rst
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  %{python3_sitelib}/%{pypi_name}.cpython-%{python3_version_nodots}*.so
  %{python3_sitelib}/%{pypi_name}.cpython-%{python3_version_nodots}*.so
  %{python3_sitelib}/%{pypi_name}-%{version}-py?.?.egg-info
  %{python3_sitelib}/%{pypi_name}-%{version}-py?.?.egg-info
%endif
   
   
%if %{with platform_python}
  %files -n platform-python-%{pypi_name}
  %files -n platform-python-%{pypi_name}
  %doc README.rst CHANGES.rst
  %doc README.rst CHANGES.rst
  %license COPYING
  %license COPYING
  %{platformpython_sitelib}/%{pypi_name}.cpython-%{platformplatformpython_version_nodots}*.so
  %{platform_python_sitelib}/%{pypi_name}.cpython-%{platform_python_version_nodots}*.so
  %{platformpython_sitelib}/%{pypi_name}-%{version}-py?.?.egg-info
  %{platform_python_sitelib}/%{pypi_name}-%{version}-py?.?.egg-info
%endif
   
   
  %changelog
  %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.
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:
Currently, we have established this as a list of packages:


  dbus-python
  dnf
  gpgme
  gpgme
  libcomps
  libcomps
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  librepo
  librepo
  pytest
  pytest
python-argcomplete
python-cffi
python-contextlib2
  python-coverage
  python-coverage
python-cryptography
python-decorator
python-extras
python-fixtures
python-funcsigs
  python-hypothesis
  python-hypothesis
python-idna
  python-iniparse
  python-iniparse
python-jinja2
python-jsonschema
python-keyring
python-linecache2
python-markupsafe
python-mimeparse
python-mock
  python-nose
  python-nose
python-pbr
python-pexpect
python-pip
python-ply
python-ptyprocess
  python-py
  python-py
  python-pyasn1
  python-rpm-generators
python-pycparser
python-pygpgme
python-pytest-timeout
  python-rpm-macros
  python-rpm-macros
python-SecretStorage
  python-setuptools
  python-setuptools
  python-setuptools_scm
  python-setuptools_scm
  python-six
  python-six
python-testtools
python-traceback2
python-unittest2
python-wheel
pyxattr
pyxdg
  rpm
  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-iniparse
platform-python-gpg
platform-python-rpm
platform-python-dnf
platform-python-libs
platform-python-six
platform-python-libcomps
platform-python-librepo
platform-python-hawkey
(And other subpackages from their source RPMs needed as dependencies for those, such as gpgme etc.)


== Benefit to Fedora ==
== 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 Python to be a separate stack will allow us to do that.
With the Modularity effort a minimal stack of Python only needed to run dnf (and potentially other system management utilities later on) 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.
   
 
Splitting the full Python stack away from Platform allows for flexible and fast paced, upstream-driven delivery, independent of the main Fedora release cycle. See [https://docs.pagure.org/modularity Modularity] for more information about this concept in general and the [[Changes/Host_and_Platform|Host and Platform change proposal]] to learn more about the abovementioned Platform module.
 
    
    
<!-- 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?-->
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== Scope ==
== Scope ==
* Proposal owners:
* Proposal owners:
** A [[Changes/Platform_Python_Stack/Roadmap|Roadmap]] has been created
** identify a list of runtime and build dependencies of dnf
** identify a list of runtime and build dependencies of dnf
** create a <code>system-python</code> source package
** create a <code>platform-python</code> source package
** change the script that generates the <code>python(abi)</code> requirements to also generate <code>system-python(abi)</code> requirements
** change the script that generates the <code>python(abi)</code> requirements to also generate <code>platform-python(abi)</code> requirements
** revert system-python related things from the {{package|python3}} package
** revert system-python related things from the {{package|python3}} package (add appropriate provides/obsoletes)
** add a <code>system-python-</code> subpackage to identified list of packages
** add a <code>platform-python-</code> subpackage to identified list of packages
** switch dnf to use that stack
** switch dnf to use that stack
<!-- What work do the feature owners have to accomplish to complete the feature in time for release?  Is it a large change affecting many parts of the distribution or is it a very isolated change? What are those changes?-->
<!-- What work do the feature owners have to accomplish to complete the feature in time for release?  Is it a large change affecting many parts of the distribution or is it a very isolated change? What are those changes?-->
Line 254: Line 289:
<!-- What work do other developers have to accomplish to complete the feature in time for release?  Is it a large change affecting many parts of the distribution or is it a very isolated change? What are those changes?-->
<!-- What work do other developers have to accomplish to complete the feature in time for release?  Is it a large change affecting many parts of the distribution or is it a very isolated change? What are those changes?-->


* Release engineering: [https://pagure.io/releng/issues #Releng issue number] (a check of an impact with Release Engineering is needed) <!-- REQUIRED FOR SYSTEM WIDE AS WELL AS FOR SELF CONTAINED CHANGES -->
* Release engineering: [https://pagure.io/releng/issue/6917 #6917] (a check of an impact with Release Engineering is needed) <!-- REQUIRED FOR SYSTEM WIDE AS WELL AS FOR SELF CONTAINED CHANGES -->
<!-- Does this feature require coordination with release engineering (e.g. changes to installer image generation or update package delivery)?  Is a mass rebuild required?  include a link to the releng issue.  
<!-- Does this feature require coordination with release engineering (e.g. changes to installer image generation or update package delivery)?  Is a mass rebuild required?  include a link to the releng issue.  
The issue is required to be filed prior to feature submission, to ensure that someone is on board to do any process development work and testing, and that all changes make it into the pipeline; a bullet point in a change is not sufficient communication -->
The issue is required to be filed prior to feature submission, to ensure that someone is on board to do any process development work and testing, and that all changes make it into the pipeline; a bullet point in a change is not sufficient communication -->
Line 314: Line 349:
If not done on time: Keep dnf running on {{package|python3}}. Finish the work in time of Fedora 28.
If not done on time: Keep dnf running on {{package|python3}}. Finish the work in time of Fedora 28.


If proven not to work as designed: Retire system-python package and remove all the system-python- subpackages. Provide/obsolete system-python- subpackages from their python3- counterparts.
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 ==
== Documentation ==
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-->
-->


[[Category:ChangePageIncomplete]]
[[Category:ChangeAcceptedF27]]
<!-- When your change proposal page is completed and ready for review and announcement -->
<!-- When your change proposal page is completed and ready for review and announcement -->
<!-- remove Category:ChangePageIncomplete and change it to Category:ChangeReadyForWrangler -->
<!-- remove Category:ChangePageIncomplete and change it to Category:ChangeReadyForWrangler -->

Latest revision as of 20:34, 25 August 2020


Platform Python Stack

Reverted
This change was reverted, because it was a bad idea entirely. See RHBZ#1483342 and the link below this box.

https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/thread/SEFUWW4XZBTVOAQ36XOJQ72PIICMFOSN/

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

Current status

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-python3.6/
    • the script that generates the python(abi) requirement will be adapted to generate platform-python(abi) requirement for that location
  • 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 rather python3-libs will relocate to platform-python-libs-devel to be available only on build-time
  • platform-python will provide platform-python(abi) instead of python(abi)

Several packages (see bellow) will introduce a new platform-python- subpackage. Example specfile of such package:

%global pypi_name foo

%bcond_without python2
%bcond_without python3
%bcond_without platform_python

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

%if %{with python2}
BuildRequires:  python2-devel
BuildRequires:  python2-setuptools
%endif

%if %{with python3}
BuildRequires:  python3-devel
BuildRequires:  python3-setuptools
%endif

%if %{with platform_python}
BuildRequires:  platform-python-devel
BuildRequires:  platform-python-setuptools
%endif

BuildArch:      noarch

%description
...

%if %{with python2}
%package -n     python2-%{pypi_name}
Summary:        %{summary}
Requires:       python2-bar
%{?python_provide:%python_provide python2-%{pypi_name}}

%description -n python2-%{pypi_name}
...
%endif

%if %{with python3}
%package -n     python3-%{pypi_name}
Summary:        %{summary}
Requires:       python3-bar
%{?python_provide:%python_provide python3-%{pypi_name}}

%description -n python3-%{pypi_name}
...
%endif


%if %{with platform_python}
%package -n     platform-python-%{pypi_name}
Summary:        %{summary}
Requires:       platform-python-bar

%description -n platform-python-%{pypi_name}
...
%endif


%prep
%autosetup -n %{pypi_name}-%{version}


%build
%if %{with python2}
%py2_build
%endif

%if %{with python3}
%py3_build
%endif

%if %{with platform_python}
%platform_py_build
%endif


%install
%if %{with python2}
%py2_install
rm %{buildroot}%{_bindir}/%{pypi_name}
%endif

%if %{with platform_python}
%platform_py_install
rm %{buildroot}%{_bindir}/%{pypi_name}
%endif

%if %{with python3}
%py3_install
%endif


%check
%if %{with python2}
export PYTHONPATH=%{buildroot}%{python2_sitelib}
%{__python2} -m unittest discover -v
%endif

%if %{with python3}
export PYTHONPATH=%{buildroot}%{python3_sitelib}
%{__python3} -m unittest discover -v
%endif

%if %{with platform_python}
export PYTHONPATH=%{buildroot}%{platform_python_sitelib}
%{__platform_python} -m unittest discover -v
%endif


%if %{with python2}
%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
%endif

%if %{with python3}
%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
%endif

%if %{with platform_python}
%files -n platform-python-%{pypi_name}
%doc README.rst CHANGES.rst
%license COPYING
%{platform_python_sitelib}/%{pypi_name}.cpython-%{platform_python_version_nodots}*.so
%{platform_python_sitelib}/%{pypi_name}-%{version}-py?.?.egg-info
%endif

%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:

dnf
gpgme
libcomps
libdnf
librepo
pytest
python-coverage
python-hypothesis
python-iniparse
python-nose
python-py
python-rpm-generators
python-rpm-macros
python-setuptools
python-setuptools_scm
python-six
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-iniparse
platform-python-gpg
platform-python-rpm
platform-python-dnf
platform-python-libs
platform-python-six
platform-python-libcomps
platform-python-librepo
platform-python-hawkey

(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 (and potentially other system management utilities later on) 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.

Splitting the full Python stack away from Platform allows for flexible and fast paced, upstream-driven delivery, independent of the main Fedora release cycle. See Modularity for more information about this concept in general and the Host and Platform change proposal to learn more about the abovementioned Platform module.


Scope

  • Proposal owners:
    • A Roadmap has been created
    • 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 generate platform-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: #6917 (a check of an impact with Release Engineering is needed)
  • 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)

Release Notes