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fix(install.ps1): handle uv stderr output with ErrorActionPreference=Stop

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On fresh Windows installs, `uv python install` writes download progress to
stderr. With $ErrorActionPreference = 'Stop' (set globally in the script),
PowerShell wraps those stderr lines as ErrorRecord objects when captured via
2>&1, then throws a terminating exception — landing in the catch block even
though uv exits 0 and Python was installed successfully.

Fix: temporarily set ErrorActionPreference to 'Continue' around the native
uv call, then verify success with `uv python find` which is the reliable
signal regardless of exit code / stderr noise.

Tested on Windows 11 (build 26200) with ExecutionPolicy=Restricted,
uv 0.11.11, fresh machine with no prior Python install.
This commit is contained in:
alt-glitch 2026-05-08 14:13:06 +05:30
parent e0c03defd5
commit ec1714e71f
1 changed files with 23 additions and 8 deletions
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31
scripts/install.ps1
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@ -145,15 +145,30 @@ function Test-Python {
# Python not found — use uv to install it (no admin needed!) # Python not found — use uv to install it (no admin needed!)
Write-Info "Python $PythonVersion not found, installing via uv..." Write-Info "Python $PythonVersion not found, installing via uv..."
try { try {
# Temporarily relax ErrorActionPreference: uv writes download progress
# to stderr, and with $ErrorActionPreference = "Stop" PowerShell wraps
# those stderr lines as ErrorRecord objects via 2>&1, then throws a
# terminating exception — even when uv exits 0. This caused fresh
# installs to fail on the first run despite Python being installed
# successfully. We verify success with `uv python find` afterwards
# which is the reliable signal regardless of exit code semantics.
$prevEAP = $ErrorActionPreference
$ErrorActionPreference = "Continue"
$uvOutput = & $UvCmd python install $PythonVersion 2>&1 $uvOutput = & $UvCmd python install $PythonVersion 2>&1
if ($LASTEXITCODE -eq 0) { $uvExitCode = $LASTEXITCODE
$pythonPath = & $UvCmd python find $PythonVersion 2>$null $ErrorActionPreference = $prevEAP
if ($pythonPath) {
$ver = & $pythonPath --version 2>$null # Check if Python is now available (more reliable than exit code
Write-Success "Python installed: $ver" # since uv may return non-zero due to "already installed" etc.)
return $true $pythonPath = & $UvCmd python find $PythonVersion 2>$null
} if ($pythonPath) {
} else { $ver = & $pythonPath --version 2>$null
Write-Success "Python installed: $ver"
return $true
}
# uv ran but Python still not findable — show what happened
if ($uvExitCode -ne 0) {
Write-Warn "uv python install output:" Write-Warn "uv python install output:"
Write-Host $uvOutput -ForegroundColor DarkGray Write-Host $uvOutput -ForegroundColor DarkGray
} }