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github-runner: canonicalizes workDir to fix actions/checkout@v6

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We ran into this issue wherein GitHub's `actions/checkout` would fail
because `git-config` would fail to include additional configuration.

The symptom was:

```
Error: fatal: could not read Username for 'https://github.com': terminal prompts disabled
```

And is caused by `git config --local includeIf.gitdir:/var/lib/github-runners/_work/…`.

Wherein `git` apparently resolves (canonicalizes) the current repository
path which then does not match the argument for `includeIf.gitdir` which
then means the configuration that `actions/checkout` is trying to apply
does not get pulled in, which then prevents git from authenticating with
GitHub and fails the build.

Ngl, gemini 3 found that out for me.

We could prefix `/private` everywhere, but changing the user's home
directory is going to [be tricky], not sure what do to about that.

[be tricky]: 7e22bf538a/modules/users/default.nix (L208)
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Louis Opter 2025-12-12 20:52:37 +00:00
parent 8393ede275
commit a58dd30d2b
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2
modules/services/github-runner/service.nix
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@ -8,7 +8,7 @@ let
mkSvcName = name: "github-runner-${name}";
mkStateDir = cfg: "/var/lib/github-runners/${cfg.name}";
mkLogDir = cfg: "/var/log/github-runners/${cfg.name}";
mkWorkDir = cfg: if (cfg.workDir != null) then cfg.workDir else "/var/lib/github-runners/_work/${cfg.name}";
mkWorkDir = cfg: if (cfg.workDir != null) then cfg.workDir else "/private/var/lib/github-runners/_work/${cfg.name}";
in
{
config.assertions = flatten (