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<#
go.ps1 – Tailscale Go toolchain fetching wrapper for Windows/PowerShell
• Reads go.toolchain.rev one dir above this script
• If the requested commit hash isn't cached, downloads and unpacks
https://github.com/tailscale/go/releases/download/build-${REV}/${OS}-${ARCH}.tar.gz
• Finally execs the toolchain's "go" binary, forwarding all args & exit-code
#>
param(
[Parameter(ValueFromRemainingArguments = $true)]
[string[]] $Args
)
Set-StrictMode -Version Latest
$ErrorActionPreference = 'Stop'
if ($env:CI -eq 'true' -and $env:NODEBUG -ne 'true') {
$VerbosePreference = 'Continue'
}
$repoRoot = Resolve-Path (Join-Path $PSScriptRoot '..')
$REV = (Get-Content (Join-Path $repoRoot 'go.toolchain.rev') -Raw).Trim()
if ([IO.Path]::IsPathRooted($REV)) {
$toolchain = $REV
} else {
if (-not [string]::IsNullOrWhiteSpace($env:TSGO_CACHE_ROOT)) {
$cacheRoot = $env:TSGO_CACHE_ROOT
} else {
$cacheRoot = Join-Path $env:USERPROFILE '.cache\tsgo'
}
$toolchain = Join-Path $cacheRoot $REV
$marker = "$toolchain.extracted"
if (-not (Test-Path $marker)) {
Write-Host "# Downloading Go toolchain $REV" -ForegroundColor Cyan
if (Test-Path $toolchain) { Remove-Item -Recurse -Force $toolchain }
# Removing the marker file again (even though it shouldn't still exist)
# because the equivalent Bash script also does so (to guard against
# concurrent cache fills?).
# TODO(bradfitz): remove this and add some proper locking instead?
if (Test-Path $marker ) { Remove-Item -Force $marker }
New-Item -ItemType Directory -Path $cacheRoot -Force | Out-Null
$url = "https://github.com/tailscale/go/releases/download/build-$REV/windows-amd64.tar.gz"
$tgz = "$toolchain.tar.gz"
Invoke-WebRequest -Uri $url -OutFile $tgz -UseBasicParsing -ErrorAction Stop
New-Item -ItemType Directory -Path $toolchain -Force | Out-Null
tar --strip-components=1 -xzf $tgz -C $toolchain
Remove-Item $tgz
Set-Content -Path $marker -Value $REV
}
}
$goExe = Join-Path $toolchain 'bin\go.exe'
if (-not (Test-Path $goExe)) { throw "go executable not found at $goExe" }
& $goExe @Args
exit $LASTEXITCODE
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