ilyagr.bsky.social
just playing with tangled
github: use the `D:` drive on Windows
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.github/actions/setup-windows/action.yml
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.github/actions/setup-windows/action.yml
···
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This action configures the Windows builders to run tests.
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runs:
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using: "composite"
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steps: []
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steps:
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# The GitHub Actions hosted Windows runners have a slow persistent
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# `C:` drive and a temporary `D:` drive with better throughput. The
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# repository checkout is placed on `D:` by default, but the user
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# profile is on `C:`, slowing down access to temporary directories
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# and the Rust toolchain we install. Since our build environment is
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# ephemeral anyway, we can save a couple minutes of CI time by
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# placing everything on `D:`.
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#
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# Some projects have reported even bigger wins by mounting a VHDX
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# virtual drive with a ReFS file system on it, with or without the
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# native Dev Drive feature available in Windows 2025, but it seems
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# to make things slightly slower for us overall compared to `D:`.
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# Further investigation and experimentation would be welcome!
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#
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# See: <https://chadgolden.com/blog/github-actions-hosted-windows-runners-slower-than-expected-ci-and-you>
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- name: 'Set up D: drive'
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shell: pwsh
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run: |
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# Set up D: drive
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# Short file names are disabled by default on the `D:` drive,
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# which breaks some of our tests. Enable them.
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#
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# This has a slight performance penalty, and won’t be possible
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# if we switch to ReFS/Dev Drives. The alternatives are to
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# reduce CI coverage for the security mitigation the tests are
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# checking, or arrange for those tests to take a separate path
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# to a drive that supports short file names to use instead of
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# the primary temporary directory.
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fsutil 8dot3name set D: 0
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# Move the temporary directory to `D:\Temp`.
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New-Item -Path D:\ -Name Temp -ItemType directory
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# Copy the effective permissions without inheritance.
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$Acl = Get-Acl -Path $env:TMP
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$Acl.SetAccessRuleProtection($true, $true)
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Set-Acl -Path D:\Temp -AclObject $Acl
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Add-Content -Path $env:GITHUB_ENV @"
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TMP=D:\Temp
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TEMP=D:\Temp
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RUSTUP_HOME=D:\.rustup
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CARGO_HOME=D:\.cargo
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"@
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.github/workflows/ci.yml
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.github/workflows/ci.yml