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`pex` question — reading through the <help>, I can...
# general
f
pex
question — reading through the help, I can’t seem to find any option to do the resolve only without actually producing a 
.pex
file on disk (which would download packages from the package index) — some sort of dry run where 
pex
could tell me — “yes, I found the packages you are asking for given all the platform constraints you have provided”. See the thread.
✅ 1
I do
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pex my-package==1.2.3 \
 -o dist/my-package.pex \
 --platform macosx_12_0_x86_64-cp-310-cp310 \
 --platform macosx_12_0_arm64-cp-310-cp310
taking advantage of 
pex
ability to resolve against multiple constraints — I only want to make sure the wheels for all the platforms are there, I don’t want to actually create a 
.pex
file.
e
Try 
pex3
- it's a console script provided by the 
pex
distribution. In particular you want 
pex3 lock create ...
- this is what Pants uses to create lockfiles now by default.
That still downloads packages mind you, you have to to do a resolve in the Python world currently since dependency and requires-python metadata are embedded inside the distributions.
f
ah I see, thanks, John! So the difference between running 
pex
and 
pex3
for my use case would be that I’ll be getting a 
.pex
file vs a lock file, but the packages would still be downloaded in both cases. Is it feasible to import the 
pex
Python module if I’d like to do the same thing via a Python program or it would be way easier just to do 
subprocess.run(["pex"....])
and check the exit code / read errors?
e
The easiest way to do this giving the most useful information is exactly this, in a subprocess please:
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pex3 lock create --style universal --platform first --platform next ...
❤️ 1
f
Amazing, thanks!
e
The lock resolve will complete (because of --style universal) but then a post process check for each platform against the lockfile can fail, but with detailed errors from PEX - not Pip.
❤️ 1
For example - Pants is not yet available for Python 3.10:
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$ pex3 lock create --style universal --platform linux_x86_64-cp-3.10.6-cp310 pantsbuild.pants
Failed to resolve compatible artifacts from lock for 1 target:
1. cp310-cp310-linux_x86_64:
    Failed to resolve all requirements for abbreviated platform cp310-cp310-linux_x86_64:

Configured with:
    build: False
    use_wheel: True

Dependency on pantsbuild-pants not satisfied, 1 incompatible candidate found:
1.) pantsbuild-pants 2.13 (via: pantsbuild.pants) requires Python <3.10,>=3.7

Dependency on setproctitle not satisfied, 1 incompatible candidate found:
1.) setproctitle 1.2.2 (via: pantsbuild.pants -> setproctitle==1.2.2) does not have any compatible artifacts:
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