Any thoughts on what, if any, would be the equival...
# generalh
high-yak-85899
02/02/2022, 1:48 AMAny thoughts on what, if any, would be the equivalent of a hermetic python in bazel for pants? We'd really like to avoid using anything on system as much as possible since it's caused us issues in the past.
w
wide-midnight-78598
02/02/2022, 3:45 AMMaybe something like this?
https://github.com/pantsbuild/pants/issues/7369
h
hundreds-father-404
02/02/2022, 4:43 AMI'm nervous to say this because I know how many issues there can be getting Python to build so it could result in lots of support issues - but I would be curious to see Pants build Python for you, possibly a la Pyenv
The Rules API design means that it would be fairly easy for us to swap out our current Python interpreter-discovery in favor of Python built by Pants - it's encapsulated fairly well already
hundreds-father-404
02/02/2022, 4:45 AMWe already have Pants installing Java and Scala for you iirc, along with Protoc, Shellcheck, etc
I think the main places we leak out are:
• discovering Python
• discovering Bash to run some internal scripts
• discovering unzip, zip, and tar to unpack and pack archive files
• discovering Docker
• when building a PEX, we default to the PATH being available because of sdists needing to be compiled
w
witty-crayon-22786
02/02/2022, 6:01 PM@high-yak-85899: one thing that can work reasonably well, but doesn’t go as far as actually building a Python from scratch is: 1) limiting the interpreter search path to only pyenv, or only some other system python that you know is trusted, 2) bounding the version precisely to the relevant version in pyenv
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witty-crayon-22786
02/02/2022, 6:01 PMthat will unfortunately mean actually maintaining that version on user’s machines though… we can’t yet help with that.
h
high-yak-85899
02/02/2022, 6:02 PMOkay, good to know what's possible now and that the idea is open for future versions!
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