Credentials in keyring not used during build

[basvanberckel]

• I have searched the issue tracker and believe that this is not a duplicate.

Make sure you run commands with -v flag before pasting the output.

Steps to reproduce

Add an index that uses credentials from keyring. run pdm build.
A more direct way is to run the pip command that is run during build, e.g.: /usr/bin/python -Esm pip install --ignore-installed --prefix /tmp/pdm-build-env-xxxxxxxx -r /tmp/pdm-build-reqs-xxxxxxxx.txt

Actual behavior

$ pdm build -v
Building sdist...
Preparing isolated env for PEP 517 build...
Looking in indexes: https://****@gitlab.com/api/v4/groups/[redacted]/-/packages/pypi/simple, https://pypi.org/simple

This hangs, pip is asking for the credentials underneath:

/usr/bin/python -Esm pip install --ignore-installed --prefix /tmp/pdm-build-env-xxxxxxxx -r /tmp/pdm-build-reqs-xxxxxxxx.txt
Looking in indexes: https://****@gitlab.com/api/v4/groups/[redacted]/-/packages/pypi/simple, https://pypi.org/simple
User for gitlab.com:

Running this command with the -s flag works correctly:

/usr/bin/python -Em pip install --ignore-installed --prefix /tmp/pdm-build-env-xxxxxxxx -r /tmp/pdm-build-reqs-xxxxxxxx.txt
Looking in indexes: https://****@gitlab.com/api/v4/groups/[redacted]/-/packages/pypi/simple, https://pypi.org/simple
Collecting pdm-pep517
  Using cached pdm_pep517-0.8.0-py3-none-any.whl (180 kB)
Installing collected packages: pdm-pep517
Successfully installed pdm-pep517-0.8.0

Expected behavior

A successful build where pip can access the keyring module

Environment Information

I'm on the current HEAD to get the fix for #523. Behavior is identical when on 1.6.4 (and using the -v flag when calling pdm)

# Paste the output of `pdm info && pdm info --env` below:
PDM version:        1.6.5.dev26+g1d68237                                   
Python Interpreter: /usr/bin/python (3.8)                                  
Project Root:       [redacted]               
Project Packages:  [redacted]/__pypackages__/3.8
{
  "implementation_name": "cpython",
  "implementation_version": "3.8.10",
  "os_name": "posix",
  "platform_machine": "x86_64",
  "platform_release": "5.11.22-100.fc32.x86_64",
  "platform_system": "Linux",
  "platform_version": "#1 SMP Wed May 19 18:58:25 UTC 2021",
  "python_full_version": "3.8.10",
  "platform_python_implementation": "CPython",
  "python_version": "3.8",
  "sys_platform": "linux"
}

[frostming]

Do you have keyring installed under /usr/bin/python prefix?

[basvanberckel]

I did not, I do now, that did indeed fix it. Thanks!