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fix(ci/windows): install zstd, or every cache save dies on a missing gzip

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The new windows-host cache steps reported '::warning::Failed to save' and
nothing ever seeded. actions/cache probes for zstd, doesn't find it, falls
back to gzip — and Git's GNU tar then shells out to a gzip that is not on
the runner daemon's PATH: 'Child returned status 127', 'cache.tgz: Cannot
write: Broken pipe', tar exit 2. Since save failures are warnings, the job
stayed green while caching silently did nothing.

zstd (+ a staged gzip.exe as insurance) now installs into its own directory
— never Git's usr\bin on PATH, which would shadow Windows' find/sort/echo.
Applied live to the runner and added to the machine PATH; this step keeps a
rebuilt runner honest.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
enricobuehler
2026-07-30 10:16:43 +02:00
co-authored by Claude Fable 5
parent b2cf4e908c
commit ba3add85b5
1 changed files with 32 additions and 0 deletions
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scripts/ci/ensure-windows-toolchain.ps1
+32
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@@ -63,3 +63,35 @@ if (-not (Test-Path $sccacheExe)) {
}
& $sccacheExe --version
if ($env:GITHUB_PATH) { Add-Content -Path $env:GITHUB_PATH -Value $sccacheDir }
# --- zstd: what actions/cache compresses with. Without it the toolkit falls back to gzip,
# and Git's GNU tar then shells out to a `gzip` that is NOT on the runner's PATH — every
# cache SAVE died with "Child returned status 127" / "Cannot write: Broken pipe" / exit 2,
# reported only as a ::warning:: so runs stayed green while nothing was ever cached
# (measured 2026-07-30 on windows-host). Own directory on purpose: putting Git's usr\bin on
# PATH would shadow Windows' find/sort/echo and break unrelated steps.
$zstdDir = 'C:\Users\Public\zstd'
$zstdExe = Join-Path $zstdDir 'zstd.exe'
if (-not (Test-Path $zstdExe)) {
try {
$v = '1.5.6'
$zip = Join-Path $env:TEMP "zstd-$v.zip"
Invoke-WebRequest -Uri "https://github.com/facebook/zstd/releases/download/v$v/zstd-v$v-win64.zip" -OutFile $zip
$tmp = Join-Path $env:TEMP 'zstd-extract'
Remove-Item -Recurse -Force $tmp -ErrorAction SilentlyContinue
Expand-Archive -Path $zip -DestinationPath $tmp -Force
New-Item -ItemType Directory -Force -Path $zstdDir | Out-Null
Get-ChildItem -Path $tmp -Recurse -Filter 'zstd.exe' | Select-Object -First 1 |
ForEach-Object { Copy-Item $_.FullName $zstdExe -Force }
$gitGzip = 'C:\Program Files\Git\usr\bin\gzip.exe'
if ((Test-Path $gitGzip) -and -not (Test-Path (Join-Path $zstdDir 'gzip.exe'))) {
Copy-Item $gitGzip (Join-Path $zstdDir 'gzip.exe') -Force
}
Remove-Item $zip, $tmp -Recurse -Force -ErrorAction SilentlyContinue
}
catch { Write-Warning "zstd install failed (cache saves will fall back to gzip): $_" }
}
if (Test-Path $zstdExe) {
& $zstdExe --version
if ($env:GITHUB_PATH) { Add-Content -Path $env:GITHUB_PATH -Value $zstdDir }
}