unable to locate 'pip' on a MacOS runner with a warm cache

[mvdan]

Description:

We are using setup-python@v5 on Linux and Mac and they have worked well for over a year. We just switched from Github-hosted runners to https://namespace.so runners, which use better caching via volume mounts, and this includes $RUNNER_TOOL_CACHE for the sake of caching for toolchain installs like Go or Python.

The initial switch worked; see this run on master: https://github.com/cue-lang/cue-py/actions/runs/19293544201/job/55169770719

However, the next nightly run with a warm cache failed: https://github.com/cue-lang/cue-py/actions/runs/19319240264/job/55257002619

I suspect this is related to #858 and #1050.

Action version:

Download action repository 'actions/setup-python@v5' (SHA:a26af69be951a213d495a4c3e4e4022e16d87065)

Platform:

• Ubuntu
• macOS
• Windows

Runner type:

• Hosted
• Self-hosted

(hosted by https://namespace.so, to be clear)

Tools version:

Current runner version: '2.329.0'
Runner name: 'nsc-runner-74j65n0k2fbr2'
Runner group name: 'Default'
Machine name: '74j65n0k2fbr2'
Namespace Runner Details
  ID: 74j65n0k2fbr2
  Operating System: macOS
  Machine Type: 6x14
  Architecture: arm64
  Instance URL: https://cloud.namespace.so/ctmuf0dqsqg1i/instance/74j65n0k2fbr2
Namespace Runner Profile Info
  Tag: namespace-profile-macos-arm64\nProfile URL: [https://cloud.namespace.so/ctmuf0dqsqg1i/actions/profile/namespace-profile-macos-arm64\nRemote](https://cloud.namespace.so/ctmuf0dqsqg1i/actions/profile/namespace-profile-macos-arm64/nRemote) Builder: Disabled.\nUser Bundled Cache: github-namespace-profile-macos-arm64-cue-lang-cue-py with 25GB.\nGit Mirror Cache: Enabled.\nRunner Tools Cache: Enabled.
GITHUB_TOKEN Permissions
  Contents: read
  Metadata: read
  Packages: read
Secret source: Actions
Prepare workflow directory
Prepare all required actions
Getting action download info
Download action repository 'actions/checkout@v5' (SHA:08c6903cd8c0fde910a37f88322edcfb5dd907a8)
Download action repository 'chetan/git-restore-mtime-action@cbf8161ddb4e9b162409104954fb540e8a38c1da' (SHA:cbf8161ddb4e9b162409104954fb540e8a38c1da)
Download action repository 'cue-lang/setup-cue@v1.0.1' (SHA:a93fa358375740cd8b0078f76355512b9208acb1)
Download action repository 'actions/setup-go@v6' (SHA:44694675825211faa026b3c33043df3e48a5fa00)
Download action repository 'actions/setup-python@v5' (SHA:a26af69be951a213d495a4c3e4e4022e16d87065)
Download action repository 'namespacelabs/nscloud-cache-action@v1' (SHA:446d8f390563cd54ca27e8de5bdb816f63c0b706)
Download action repository 'actions/checkout@v4' (SHA:08eba0b27e820071cde6df949e0beb9ba4906955)
Complete job name: test (stable, 3.12, ns-macos-arm64)
[...]
Run actions/setup-python@v5
  with:
    python-version: 3.12
    cache: pip
    check-latest: false
    token: ***
    update-environment: true
    allow-prereleases: false
    freethreaded: false
  env:
    GOTOOLCHAIN: local
Installed versions
  Successfully set up CPython (3.12.10)

Repro steps:

See the description above. The code is all open source, and I'm happy to test possible fixes.

Expected behavior:

Success.

Actual behavior:

Error: Unable to locate executable file: pip. Please verify either the file path exists or the file can be found within a directory specified by the PATH environment variable. Also check the file mode to verify the file is executable.

[lmvysakh]

Hello  @mvdan ,

Thank you for reporting this issue. We will investigate it and get back to you as soon as we have some feedback.

[mvdan]

Thank you for the quick response! It's all open source and I'm happy to try whatever you want me to try. You can also send PRs with patches if you wish.