building pipeline

tools/bootstrap/node_.ps1

@@ -0,0 +1,57 @@
+## bootstrap/node_.ps1
+##
+## Node bootstrapping script for Windows.
+##
+## Automatically downloads a Node version to a cache directory and invokes it.
+##
+## The underscore in the name is so that typing `bootstrap/node` into
+## PowerShell finds the `.bat` file first, which ensures this script executes
+## regardless of ExecutionPolicy.
+
+#Requires -Version 4.0
+
+$Host.ui.RawUI.WindowTitle = "starting :: node $Args"
+$ErrorActionPreference = "Stop"
+
+## This forces UTF-8 encoding across all powershell built-ins
+$OutputEncoding = [System.Console]::OutputEncoding = [System.Text.Encoding]::UTF8
+$PSDefaultParameterValues['*:Encoding'] = 'utf8'
+
+function ExtractVersion {
+	param([string] $Path, [string] $Key)
+	foreach ($Line in Get-Content $Path) {
+		if ($Line.StartsWith("export $Key=")) {
+			return $Line.Substring("export $Key=".Length)
+		}
+	}
+	throw "Couldn't find value for $Key in $Path"
+}
+
+## Convenience variables
+$BaseDir = Split-Path $script:MyInvocation.MyCommand.Path
+$Cache = "$BaseDir/.cache"
+if ($Env:TG_BOOTSTRAP_CACHE) {
+	$Cache = $Env:TG_BOOTSTRAP_CACHE
+}
+$NodeVersion = ExtractVersion -Path "$BaseDir/../../dependencies.sh" -Key "NODE_VERSION_PRECISE"
+$NodeDir = "$Cache/node-v$NodeVersion"
+$NodeExe = "$NodeDir/node.exe"
+
+## Download and unzip Node
+if (!(Test-Path $NodeExe -PathType Leaf)) {
+	$Host.ui.RawUI.WindowTitle = "Downloading Node $NodeVersion..."
+	New-Item $NodeDir -ItemType Directory -ErrorAction silentlyContinue | Out-Null
+	Invoke-WebRequest `
+		"https://nodejs.org/download/release/v$NodeVersion/win-x86/node.exe" `
+		-OutFile $NodeExe `
+		-ErrorAction Stop
+}
+
+## Set PATH so that recursive calls find it
+$Env:PATH = "$NodeDir;$ENV:Path"
+
+## Invoke Node with all command-line arguments
+$Host.ui.RawUI.WindowTitle = "node $Args"
+$ErrorActionPreference = "Continue"
+& "$NodeExe" @Args
+exit $LastExitCode