Does anyone know what python_bootstrap is for, re:...
# developmentw
wide-midnight-78598
10/27/2025, 1:32 PMDoes anyone know what python_bootstrap is for, re: PBS python?
src/python/pants/core/subsystems/python_bootstrap.py
Are we downloading from there? I thought we used scie-pants to handle downloads
p
proud-dentist-22844
10/27/2025, 6:24 PMThat's to allow people to auto-download a PBS python to run user code (eg to run pytest or pylint or for
pants runw
wide-midnight-78598
10/27/2025, 6:26 PMclass PythonBootstrapSubsystem(Subsystem):
options_scope = "python-bootstrap"
help = help_text(
"""
Options used to locate Python interpreters.
This subsystem controls where and how Pants will locate Python, but beyond that it does
not control which Python interpreter versions are actually used for your code: see the
subsystem for that.python
"""
)
p
proud-dentist-22844
10/27/2025, 6:26 PMAh. I actually looked at the code. I was talking about src/python/pants/backend/python/providers/python_build_standalone/
proud-dentist-22844
10/27/2025, 6:26 PMMy bad.
w
wide-midnight-78598
10/27/2025, 6:27 PMpants/src/python/pants/core/subsystems/python_bootstrap.pyp
proud-dentist-22844
10/27/2025, 6:27 PMyup. Good question. Does that do anything these days? Or is it only for when pants is running from source (bypassing the scie-pants logic)?
w
wide-midnight-78598
10/27/2025, 6:29 PMExactly, haven't dug in - this is part of the Python 3.14 update, I was just looking at all the places where we had to do something
wide-midnight-78598
10/27/2025, 6:30 PMMy guess was that it was for the non-scie case, but I wasn't sure. Checking if anyone else knew offhand before I start digging
wide-midnight-78598
10/27/2025, 6:33 PMRegardless of what it does, while doing this upgrade, I'm more convinced that our endgame is publishing scies.
h
happy-kitchen-89482
10/27/2025, 9:34 PMIt's used only to find a Python interpreter on which to run the scripts in src/python/pants/core/util_rules/adhoc_binaries.py
happy-kitchen-89482
10/27/2025, 9:34 PME.g., "GunzipBinary" is implemented by running a little python script that calls the`gzip` module
happy-kitchen-89482
10/27/2025, 9:34 PMSo this is related to that.
w
wide-midnight-78598
10/27/2025, 10:00 PMThat’s it? Was it originally used for more?
h
happy-kitchen-89482
10/28/2025, 4:25 PMI think it was never used for more
happy-kitchen-89482
10/28/2025, 4:25 PM@bitter-ability-32190 has the most context though
b
bitter-ability-32190
10/30/2025, 10:49 AMYeah IIRC we maybe had other Python processes as well. Maybe there aren't any left that aren't gunzip?
w
wide-midnight-78598
10/30/2025, 6:19 PM👍 Okay, good to know that the usage may have migrated over time. Just saw that the other day and was very confused
b
bitter-ability-32190
10/30/2025, 6:57 PMIt's a bummer we need to shell out to Python to gunzip. Iirc there was no standard binary for that we could rely on
bitter-ability-32190
10/30/2025, 6:58 PMThere's probably some Rust implemented one we could just curl though? 🤷♂️
w
wide-midnight-78598
10/30/2025, 7:37 PMIm sure there is. Likely 50 that all roughly do the same thing 😆
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