find_interpreter fragile across Python minor versions

[cburroughs]

See pex-tool/pex#3113 for background

In https://github.com/pantsbuild/pants/blob/2804a4673f/src/python/pants/backend/python/util_rules/pex.py#L386-L430

we hash the python binary, but that is not actually guaranteed to change across minor versions (So Python

More generally in https://github.com/pantsbuild/pants/blob/2804a4673f/src/python/pants/core/util_rules/system_binaries.py#L110 we generally assume that the binary only changes if something like the output of --version changes, but that is not true in the face of dynamic linking. Ex awk isn't just awk but:

$ ldd /usr/bin/awk
	linux-vdso.so.1 (0x00007f9513b81000)
	libreadline.so.8 => /usr/lib64/libreadline.so.8 (0x00007f9513a11000)
	libmpfr.so.6 => /usr/lib64/libmpfr.so.6 (0x00007f9513955000)
	libgmp.so.10 => /usr/lib64/libgmp.so.10 (0x00007f95138ad000)
	libm.so.6 => /usr/lib64/libm.so.6 (0x00007f95137ef000)
	libc.so.6 => /usr/lib64/libc.so.6 (0x00007f9513624000)
	libtinfow.so.6 => /usr/lib64/libtinfow.so.6 (0x00007f95135e9000)
	/lib64/ld-linux-x86-64.so.2 (0x00007f9513b83000)

In the "extreme" python case from the linked issue, almost all of the code is in the .so files, not the "binary".

[jsirois]

FWIW, you're already running Pex in a sub-process in that code; so you apparently don't have speed worries like I do over in Pex. At that point you might as well run pex3 interpreter inspect --markers --tags; i.e. generate a complete platform JSON blob and just hash that. The JSON blob includes a path and the rest of the data - markers and tags - is exactly what uniquely identifies an interpreter for abi compatibility and resolve compatibility - which I think must cover all Pants cares about when selecting an interpreter to do things with.

Also, in Python parlance you mean micro versions I think (I'd call that patch versions ala semver):

:; python -c 'import sys; print(sys.version_info)'
sys.version_info(major=3, minor=14, micro=3, releaselevel='final', serial=0)

I'm pretty sure this is not a problem across minor versions; i.e. 3.13 -> 3.14.