build.ps1

##########################################################################
# This is the Cake bootstrapper script for PowerShell.
# This file was downloaded from https://github.com/cake-build/resources
# Feel free to change this file to fit your needs.
##########################################################################

<#

.SYNOPSIS
This is a Powershell script to bootstrap a Cake build.

.DESCRIPTION
This Powershell script will download NuGet if missing, restore NuGet tools (including Cake)
and execute your Cake build script with the parameters you provide.

.PARAMETER Script
The build script to execute.
.PARAMETER Target
The build script target to run.
.PARAMETER Configuration
The build configuration to use.
.PARAMETER Verbosity
Specifies the amount of information to be displayed.
.PARAMETER ShowDescription
Shows description about tasks.
.PARAMETER DryRun
Performs a dry run.
.PARAMETER Experimental
Uses the nightly builds of the Roslyn script engine.
.PARAMETER Mono
Uses the Mono Compiler rather than the Roslyn script engine.
.PARAMETER SkipToolPackageRestore
Skips restoring of packages.
.PARAMETER ScriptArgs
Remaining arguments are added here.

.LINK
https://cakebuild.net

#>

[CmdletBinding()]
Param(
    [string]$Script = "build.cake",
    [string]$Target,
    [string]$Configuration,
    [ValidateSet("Quiet", "Minimal", "Normal", "Verbose", "Diagnostic")]
    [string]$Verbosity,
    [switch]$ShowDescription,
    [Alias("WhatIf", "Noop")]
    [switch]$DryRun,
    [switch]$Experimental,
    [switch]$Mono,
    [switch]$SkipToolPackageRestore,
    [Parameter(Position=0,Mandatory=$false,ValueFromRemainingArguments=$true)]
    [string[]]$ScriptArgs
)

[Reflection.Assembly]::LoadWithPartialName("System.Security") | Out-Null
function MD5HashFile([string] $filePath)
{
    if ([string]::IsNullOrEmpty($filePath) -or !(Test-Path $filePath -PathType Leaf))
    {
        return $null
    }

    [System.IO.Stream] $file = $null;
    [System.Security.Cryptography.MD5] $md5 = $null;
    try
    {
        $md5 = [System.Security.Cryptography.MD5]::Create()
        $file = [System.IO.File]::OpenRead($filePath)
        return [System.BitConverter]::ToString($md5.ComputeHash($file))
    }
    finally
    {
        if ($file -ne $null)
        {
            $file.Dispose()
        }
    }
}

function GetProxyEnabledWebClient
{
    $wc = New-Object System.Net.WebClient
    $proxy = [System.Net.WebRequest]::GetSystemWebProxy()
    $proxy.Credentials = [System.Net.CredentialCache]::DefaultCredentials        
    $wc.Proxy = $proxy
    return $wc
}

Write-Host "Preparing to run build script..."

if(!$PSScriptRoot){
    $PSScriptRoot = Split-Path $MyInvocation.MyCommand.Path -Parent
}

$TOOLS_DIR = Join-Path $PSScriptRoot "tools"
$NUGET_EXE = Join-Path $TOOLS_DIR "nuget.exe"
$CAKE_EXE = Join-Path $TOOLS_DIR "Cake/Cake.exe"
$PACKAGES_CSPROJ = Join-Path $TOOLS_DIR "packages.csproj"
$PACKAGES_CSPROJ_MD5 = Join-Path $TOOLS_DIR "packages.csproj.md5sum"

# Make sure tools folder exists
if ((Test-Path $PSScriptRoot) -and !(Test-Path $TOOLS_DIR)) {
    Write-Verbose -Message "Creating tools directory..."
    New-Item -Path $TOOLS_DIR -Type directory | out-null
}

# Restore tools from NuGet?
if(-Not $SkipToolPackageRestore.IsPresent) {
    Push-Location
    Set-Location $TOOLS_DIR

    # Check for changes in packages.config and remove installed tools if true.
    [string] $md5Hash = MD5HashFile($PACKAGES_CSPROJ)
    if((!(Test-Path $PACKAGES_CSPROJ_MD5)) -Or
      ($md5Hash -ne (Get-Content $PACKAGES_CSPROJ_MD5 ))) {
        Write-Verbose -Message "Missing or changed package.config hash..."
        Remove-Item * -Recurse -Exclude packages.csproj,nuget.exe
    }

    Write-Verbose -Message "Restoring tools from NuGet..."
    $NuGetOutput = Invoke-Expression "dotnet restore '$PACKAGES_CSPROJ' --packages '$TOOLS_DIR'"

    if ($LASTEXITCODE -ne 0) {
        Throw "An error occurred while restoring NuGet tools."
    }
    else
    {
        $md5Hash | Out-File $PACKAGES_CSPROJ_MD5 -Encoding "ASCII"
    }
    Write-Verbose -Message ($NuGetOutput | out-string)

    Pop-Location
}

$CAKE_DLL = Get-ChildItem . -name Cake.dll -recurse

# Make sure that Cake has been installed.
if (!(Test-Path $CAKE_DLL)) {
    Throw "Could not find Cake.dll in tools folder"
}

# Build Cake arguments
$cakeArguments = @("$Script");
if ($Target) { $cakeArguments += "--target=$Target" }
if ($Configuration) { $cakeArguments += "--configuration=$Configuration" }
if ($Verbosity) { $cakeArguments += "--verbosity=$Verbosity" }
if ($ShowDescription) { $cakeArguments += "--showdescription" }
if ($DryRun) { $cakeArguments += "--dryrun" }
if ($Experimental) { $cakeArguments += "--experimental" }
if ($Mono) { $cakeArguments += "--mono" }
$cakeArguments += $ScriptArgs

# Start Cake
Write-Host "Running build script..."
&dotnet $CAKE_DLL $cakeArguments
exit $LASTEXITCODE