Environment markers that match specific type of machines (pattern-matching)

[kratsg]

I have multiple centos7 machines that have the following platform_release values:

>>> import platform; platform.release()

which has the following values so far

• '3.10.0-1160.42.2.el7.x86_64'
• '3.10.0-1127.el7.x86_64'
• '3.10.0-1127.18.2.el7.x86_64'
• '3.10.0-1160.59.1.el7.x86_64'

Can I do something like platform_release ~= *.el7.x86_64 to pattern match? This is needed to provide an upper-bound on centos7 machines for some python packages.

I ran the parsley code from PEP508 which gives me the following tuple, but still digging how python evaluates it after parsing...

name; platform_release ~= '*-*.el7.x86_64' -> ('name', [], [], ('~=', '3.10.0-1127.18.2.el7.x86_64', '*-*.el7.x86_64'))

[kratsg]

A possible solution is through the following:

>>> from packaging.markers import Marker
>>> Marker("'el7.x86_64' in platform_release").evaluate()
True

so checking if this is valid.

[kratsg]

So I can see that parsley is considering it valid following PEP508:

name; 'el7.x86_64' in platform_release -> ('name', [], [], ('in', 'el7.x86_64', '3.10.0-1127.18.2.el7.x86_64'))

and this is in packaging.markers grammar as well, but it seems hatch is not supporting it?

>>> from packaging.requirements import Requirement
>>> req = Requirement("name; 'el7.x86_64' in platform_release")
>>> req.marker
<Marker('"el7.x86_64" in platform_release')>
>>> req.marker.evaluate()
True

seems to be ok here.

[kratsg]

Ok, never mind -- this worked!

[kratsg]

Really wish PEP508 would mention the in and not in that packaging.markers supports... but maybe hatch can put some documentation on this? This really helps with string matching on some level..