[Distutils] [RFC] PEP 345 and PEP 386 updates
mal at egenix.com
Tue Oct 20 13:37:48 CEST 2009
Tarek Ziadé wrote:
> PEP 345 is the PEP for the new metadata format, replacing PEP 314. I
> have upgraded it, using Tres's work from last year, and the next step
> is to add the context marker presented in PEP 390.
> I have also updated PEP 386 to link it to PEP 345.
> = PEP 345 : Summary of Differences From PEP 314 =
> * Metadata-Version is now 1.2.
> * Added fields:
> - Maintainer
> - Maintainer-email
> - Requires-Python
> - Requires-External
> - Requires-Dist
> - Provides-Dist
> - Obsoletes-Dist
> * Deprecated fields:
> - Requires (in favor of Requires-Dist)
> - Provides (in favor of Provides-Dist)
> - Obsoletes (in favor of Obsoletes-Dist)
Where's the benefit of renaming the above three fields ?
After all, the meta-data format is a distutils specific format,
so the extra "-Dist" qualifier appears unnecessary.
I'd also remove the "Requires-" from "Requires-Python" and
simply use "Python" as field name. The intent should be clear,
e.g. for Python 2 packages that need at least 2.6:
Python: >2.6, <3.0
I'd also like to suggest the addition of conditional field
values as already discussed in private mail. This would
allow defining requirements based on the target platform
and use the same micro-language as suggested in PEP 390.
Here's a sketch (following Python's inline if syntax and the
example from PEP 390):
requires: pywin32; if sys_platform == 'win32'
requires: bar (>1.0); if sys_platform == 'win32'
requires: foo; if platform_machine == 'i386'
requires: bar; if python_version == '2.4' or python_version == '2.5'
requires: baz; if 'linux' in sys_platform
Each of the listed requires field entries only applies if the
condition matches the target platform.
The micro-language should provide a limited number of
variables to use on the conditions:
python_version = sys.version
sys_platform = sys.platform
os_name = os.name
platform_machine = platform.machine()
platform_version = platform.version()
and possibly more.
The same notation could also be used in setup() keyword
parameters for the meta-data fields, e.g.
setup(..., requires=["pywin32; if sys_platform == 'win32'"], ...)
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