Switch to cake so that we can add more complex tasks (#70)

Switch to cake so that we can add more complex tasks - added the NuGet Validator step - Adding a build counter tied to the branch
2019-02-11 07:22:16 +02:00 · 2019-02-11 07:22:16 +02:00 · 5c152f8162
--- a/.gitignore
+++ b/.gitignore
@ -5,6 +5,8 @@

 # Repository-specific files
 output/
+tools/*
+!tools/packages.config

 # User-specific files
 *.suo
--- a/README.md
+++ b/README.md
@ -17,16 +17,15 @@ Each sub-directory has a solution file that can be opened in Visual Studio or
 built by MSBuild. All scripting and tasks are performed by MSBuild, so no
 external tooling is needed.

-There is a single PowerShell script that can be used to build the entire
+There is a single PowerShell/bash script that can be used to build the entire
 repository:

-    PS > .\build.ps1
+    > .\build.ps1
+    $ ./build.sh

 The CI server just runs that single file and outputs all the packages,
 assemblies and test results.

-_NOTE: for macOS, you may need to [first install PowerShell][pwsh]._
-
 ## License

 The code in this repository is licensed under the [MIT License][license].
@ -38,4 +37,3 @@ The code in this repository is licensed under the [MIT License][license].
 [extended]: https://github.com/mono/SkiaSharp.Extended/tree/master/SkiaSharp.Extended
 [iconify]: https://github.com/mono/SkiaSharp.Extended/tree/master/SkiaSharp.Extended.Iconify
 [svg]: https://github.com/mono/SkiaSharp.Extended/tree/master/SkiaSharp.Extended.Svg
-[pwsh]: https://github.com/PowerShell/PowerShell
--- a/SkiaSharp.Extended.Iconify/source/IconifyGenerator/IconifyGenerator.csproj
+++ b/SkiaSharp.Extended.Iconify/source/IconifyGenerator/IconifyGenerator.csproj
@ -5,6 +5,7 @@
    <TargetFramework>net461</TargetFramework>
    <RootNamespace>IconifyGenerator</RootNamespace>
    <AssemblyName>iconify</AssemblyName>
+    <IsPackable>false</IsPackable>
  </PropertyGroup>

  <ItemGroup>
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@ -5,7 +5,7 @@ variables:
  VERBOSITY: normal
  GIT_SHA: $(Build.SourceVersion)
  GIT_BRANCH_NAME: $(Build.SourceBranchName)
-  BUILD_NUMBER: $(Build.BuildId)
+  BUILD_NUMBER: $[counter('$(Build.SourceBranchName)_counter', 1)]
  MONO_VERSION: 5_16_0
  XCODE_VERSION: 10.1

@ -53,7 +53,7 @@ jobs:
        displayName: Switch to the latest Xamarin SDK
      - bash: echo '##vso[task.setvariable variable=MD_APPLE_SDK_ROOT;]'/Applications/Xcode_$(XCODE_VERSION).app;sudo xcode-select --switch /Applications/Xcode_$(XCODE_VERSION).app/Contents/Developer
        displayName: Switch to the latest Xcode
-      - powershell: .\build.ps1
+      - bash: ./build.sh
      - task: PublishTestResults@2
        inputs:
          testResultsFormat: xUnit
--- a/build.cake
+++ b/build.cake
@ -0,0 +1,124 @@
+#addin nuget:?package=Xamarin.Nuget.Validator&version=1.1.1
+
+var target = Argument("t", Argument("target", "Default"));
+var configuration = Argument("c", Argument("configuration", "Release"));
+
+var BUILD_NUMBER = EnvironmentVariable("BUILD_NUMBER");
+
+var previewTag = $"preview{BUILD_NUMBER}";
+
+Task("build")
+    .Does(() =>
+{
+    foreach (var subProject in GetDirectories("*")) {
+        foreach (var sln in GetFiles($"{subProject}/*.sln")) {
+            MSBuild(sln, c => {
+                c.Configuration = configuration;
+                c.MSBuildPlatform = MSBuildPlatform.x86;
+                c.Restore = true;
+                c.Verbosity = Verbosity.Minimal;
+                if (!IsRunningOnWindows())
+                    c.Properties["Platform"] = new [] { "iPhoneSimulator" };
+            });
+        }
+    }
+});
+
+Task("nuget")
+    .IsDependentOn("build")
+    .Does(() =>
+{
+    foreach (var subProject in GetDirectories("*")) {
+        foreach (var csproj in GetFiles($"{subProject}/source/**/*.csproj")) {
+            MSBuild(csproj, c => {
+                c.Configuration = configuration;
+                c.MSBuildPlatform = MSBuildPlatform.x86;
+                c.Restore = true;
+                c.Verbosity = Verbosity.Minimal;
+                c.Targets.Clear();
+                c.Targets.Add("Pack");
+            });
+            MSBuild(csproj, c => {
+                c.Configuration = configuration;
+                c.MSBuildPlatform = MSBuildPlatform.x86;
+                c.Restore = true;
+                c.Verbosity = Verbosity.Minimal;
+                c.Targets.Clear();
+                c.Targets.Add("Pack");
+                c.Properties["VersionSuffix"] = new [] { previewTag };
+            });
+
+            var output = $"output/{subProject.GetDirectoryName()}";
+            EnsureDirectoryExists(output);
+
+            var bin = csproj.GetDirectory().Combine($"bin/{configuration}/");
+            CopyDirectory(bin, output);
+
+            EnsureDirectoryExists("output/nugets");
+            CopyFiles($"{bin}/*.nupkg", "output/nugets");
+        }
+    }
+});
+
+Task("test")
+    .IsDependentOn("build")
+    .Does(() =>
+{
+    foreach (var subProject in GetDirectories("*")) {
+        foreach (var csproj in GetFiles($"{subProject}/tests/**/*.csproj")) {
+            MSBuild(csproj, c => {
+                c.Configuration = configuration;
+                c.MSBuildPlatform = MSBuildPlatform.x86;
+                c.Restore = true;
+                c.Verbosity = Verbosity.Minimal;
+                c.Targets.Clear();
+                c.Targets.Add("Test");
+            });
+
+            var output = $"output/{subProject.GetDirectoryName()}";
+            EnsureDirectoryExists(output);
+
+            var bin = csproj.GetDirectory().Combine($"bin/{configuration}/");
+            CopyFiles($"{bin}/**/TestResult.xml", output);
+        }
+    }
+});
+
+Task("nuget-validation")
+    .IsDependentOn("nuget")
+    .Does(() =>
+{
+    var options = new Xamarin.Nuget.Validator.NugetValidatorOptions {
+        Copyright = "© Microsoft Corporation. All rights reserved.",
+        Author = "Microsoft",
+        Owner = "Microsoft",
+        NeedsProjectUrl = true,
+        NeedsLicenseUrl = true,
+        ValidateRequireLicenseAcceptance = true,
+        ValidPackageNamespace = new [] { "SkiaSharp" },
+    };
+
+    var nupkgFiles = GetFiles("./output/nugets/*.nupkg");
+    Information("Found ({0}) NuGets to validate", nupkgFiles.Count());
+    foreach (var nupkgFile in nupkgFiles) {
+        Information("Verifiying Metadata of {0}...", nupkgFile.GetFilename());
+
+        var result = Xamarin.Nuget.Validator.NugetValidator.Validate(MakeAbsolute(nupkgFile).FullPath, options);
+        if (!result.Success) {
+            Information("Metadata validation failed for: {0} \n\n", nupkgFile.GetFilename());
+            Information(string.Join("\n    ", result.ErrorMessages));
+            throw new Exception($"Invalid Metadata for: {nupkgFile.GetFilename()}");
+
+        } else {
+            Information("Metadata validation passed for: {0}", nupkgFile.GetFilename());
+        }
+    }
+});
+
+Task("Default")
+    .IsDependentOn("build")
+    .IsDependentOn("nuget")
+    .IsDependentOn("nuget-validation")
+    .IsDependentOn("test");
+
+RunTarget(target);
--- a/build.ps1
+++ b/build.ps1
@ -1,87 +1,242 @@
-$ErrorActionPreference = "Stop"
+##########################################################################
+# 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.
+##########################################################################

-$configuration = "Release"
+<#

-if (!$env:BUILD_NUMBER) {
-    $betaPrefix = "preview"
-} else {
-    $betaPrefix = "preview$env:BUILD_NUMBER"
-}
+.SYNOPSIS
+This is a Powershell script to bootstrap a Cake build.

-if ($IsMacOS) {
-    $msbuild = "msbuild"
-} else {
-    $vswhere = 'C:\Program Files (x86)\Microsoft Visual Studio\Installer\vswhere.exe'
-    $msbuild = & $vswhere -latest -products * -requires Microsoft.Component.MSBuild -property installationPath
-    $msbuild = join-path $msbuild 'MSBuild\15.0\Bin\MSBuild.exe'
-}
+.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.

-function Build
-{
-    Param ([string] $solution, [string] $output)
+.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 SkipToolPackageRestore
+Skips restoring of packages.
+.PARAMETER ScriptArgs
+Remaining arguments are added here.

-    if ($IsMacOS) {
-        $extraProperties = "/p:Platform=iPhoneSimulator"
+.LINK
+https://cakebuild.net
+
+#>
+
+[CmdletBinding()]
+Param(
+    [string]$Script = "build.cake",
+    [string]$Target,
+    [string]$Configuration,
+    [ValidateSet("Quiet", "Minimal", "Normal", "Verbose", "Diagnostic")]
+    [string]$Verbosity,
+    [switch]$ShowDescription,
+    [Alias("WhatIf", "Noop")]
+    [switch]$DryRun,
+    [switch]$SkipToolPackageRestore,
+    [Parameter(Position=0,Mandatory=$false,ValueFromRemainingArguments=$true)]
+    [string[]]$ScriptArgs
+)
+
+# Attempt to set highest encryption available for SecurityProtocol.
+# PowerShell will not set this by default (until maybe .NET 4.6.x). This
+# will typically produce a message for PowerShell v2 (just an info
+# message though)
+try {
+    # Set TLS 1.2 (3072), then TLS 1.1 (768), then TLS 1.0 (192), finally SSL 3.0 (48)
+    # Use integers because the enumeration values for TLS 1.2 and TLS 1.1 won't
+    # exist in .NET 4.0, even though they are addressable if .NET 4.5+ is
+    # installed (.NET 4.5 is an in-place upgrade).
+    [System.Net.ServicePointManager]::SecurityProtocol = 3072 -bor 768 -bor 192 -bor 48
+  } catch {
+    Write-Output 'Unable to set PowerShell to use TLS 1.2 and TLS 1.1 due to old .NET Framework installed. If you see underlying connection closed or trust errors, you may need to upgrade to .NET Framework 4.5+ and PowerShell v3'
  }

-    & $msbuild $solution /v:m /t:restore /p:Configuration=$configuration $extraProperties
-    if ($lastexitcode -ne 0) { exit $lastexitcode }
-
-    & $msbuild $solution /v:m /t:build /p:Configuration=$configuration $extraProperties
-    if ($lastexitcode -ne 0) { exit $lastexitcode }
-}
-
-function Pack
+[Reflection.Assembly]::LoadWithPartialName("System.Security") | Out-Null
+function MD5HashFile([string] $filePath)
 {
-    Param ([string] $project, [string] $output)
+    if ([string]::IsNullOrEmpty($filePath) -or !(Test-Path $filePath -PathType Leaf))
+    {
+        return $null
+    }

-    & $msbuild $project /v:m /t:pack /p:Configuration=$configuration
-    if ($lastexitcode -ne 0) { exit $lastexitcode }
-
-    & $msbuild $project /v:m /t:pack /p:Configuration=$configuration /p:VersionSuffix="$betaPrefix"
-    if ($lastexitcode -ne 0) { exit $lastexitcode }
-
-    $dir = [System.IO.Path]::GetDirectoryName($project)
-    New-Item -Path "./output/$output" -ItemType Directory -Force | Out-Null
-    Copy-Item -Path "$dir/bin/$configuration" -Destination "./output/$output" -Recurse -Force
-    New-Item -Path "./output/nugets" -ItemType Directory -Force | Out-Null
-    Copy-Item -Path "$dir/bin/$configuration/*.nupkg" -Destination "./output/nugets/" -Recurse -Force
+    [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 Test
+function GetProxyEnabledWebClient
 {
-    Param ([string] $project, [string] $output)
-
-    & $msbuild $project /v:m /t:test /p:Configuration=$configuration
-    if ($lastexitcode -ne 0) { exit $lastexitcode }
-
-    $dir = [System.IO.Path]::GetDirectoryName($project)
-    New-Item -Path "./output/$output" -ItemType Directory -Force | Out-Null
-    Copy-Item -Path "$dir/bin/$configuration/net47/TestResult.xml" -Destination "./output/$output" -Force
+    $wc = New-Object System.Net.WebClient
+    $proxy = [System.Net.WebRequest]::GetSystemWebProxy()
+    $proxy.Credentials = [System.Net.CredentialCache]::DefaultCredentials
+    $wc.Proxy = $proxy
+    return $wc
 }

-Write-Output "MSBuild path: '$msbuild'"
+Write-Host "Preparing to run build script..."

-Write-Output "Building SkiaSharp.Extended..."
-Build "./SkiaSharp.Extended/SkiaSharp.Extended.sln"                 "SkiaSharp.Extended"
-Pack  "./SkiaSharp.Extended/source/SkiaSharp.Extended.csproj"       "SkiaSharp.Extended"
-Test  "./SkiaSharp.Extended/tests/SkiaSharp.Extended.Tests.csproj"  "SkiaSharp.Extended"
+if(!$PSScriptRoot){
+    $PSScriptRoot = Split-Path $MyInvocation.MyCommand.Path -Parent
+}

-Write-Output "Building SkiaSharp.Extended.Iconify..."
-Build "./SkiaSharp.Extended.Iconify/SkiaSharp.Extended.Iconify.sln"                                                                               "SkiaSharp.Extended.Iconify"
-Pack  "./SkiaSharp.Extended.Iconify/source/SkiaSharp.Extended.Iconify/SkiaSharp.Extended.Iconify.csproj"                                          "SkiaSharp.Extended.Iconify"
-Pack  "./SkiaSharp.Extended.Iconify/source/SkiaSharp.Extended.Iconify.FontAwesome/SkiaSharp.Extended.Iconify.FontAwesome.csproj"                  "SkiaSharp.Extended.Iconify"
-Pack  "./SkiaSharp.Extended.Iconify/source/SkiaSharp.Extended.Iconify.IonIcons/SkiaSharp.Extended.Iconify.IonIcons.csproj"                        "SkiaSharp.Extended.Iconify"
-Pack  "./SkiaSharp.Extended.Iconify/source/SkiaSharp.Extended.Iconify.MaterialDesignIcons/SkiaSharp.Extended.Iconify.MaterialDesignIcons.csproj"  "SkiaSharp.Extended.Iconify"
-Pack  "./SkiaSharp.Extended.Iconify/source/SkiaSharp.Extended.Iconify.MaterialIcons/SkiaSharp.Extended.Iconify.MaterialIcons.csproj"              "SkiaSharp.Extended.Iconify"
-Pack  "./SkiaSharp.Extended.Iconify/source/SkiaSharp.Extended.Iconify.Meteocons/SkiaSharp.Extended.Iconify.Meteocons.csproj"                      "SkiaSharp.Extended.Iconify"
-Pack  "./SkiaSharp.Extended.Iconify/source/SkiaSharp.Extended.Iconify.SimpleLineIcons/SkiaSharp.Extended.Iconify.SimpleLineIcons.csproj"          "SkiaSharp.Extended.Iconify"
-Pack  "./SkiaSharp.Extended.Iconify/source/SkiaSharp.Extended.Iconify.Typicons/SkiaSharp.Extended.Iconify.Typicons.csproj"                        "SkiaSharp.Extended.Iconify"
-Pack  "./SkiaSharp.Extended.Iconify/source/SkiaSharp.Extended.Iconify.WeatherIcons/SkiaSharp.Extended.Iconify.WeatherIcons.csproj"                "SkiaSharp.Extended.Iconify"
+$TOOLS_DIR = Join-Path $PSScriptRoot "tools"
+$ADDINS_DIR = Join-Path $TOOLS_DIR "Addins"
+$MODULES_DIR = Join-Path $TOOLS_DIR "Modules"
+$NUGET_EXE = Join-Path $TOOLS_DIR "nuget.exe"
+$CAKE_EXE = Join-Path $TOOLS_DIR "Cake/Cake.exe"
+$NUGET_URL = "https://dist.nuget.org/win-x86-commandline/latest/nuget.exe"
+$PACKAGES_CONFIG = Join-Path $TOOLS_DIR "packages.config"
+$PACKAGES_CONFIG_MD5 = Join-Path $TOOLS_DIR "packages.config.md5sum"
+$ADDINS_PACKAGES_CONFIG = Join-Path $ADDINS_DIR "packages.config"
+$MODULES_PACKAGES_CONFIG = Join-Path $MODULES_DIR "packages.config"

-Write-Output "Building SkiaSharp.Extended.Svg..."
-Build "./SkiaSharp.Extended.Svg/SkiaSharp.Extended.Svg.sln"                 "SkiaSharp.Extended.Svg"
-Pack  "./SkiaSharp.Extended.Svg/source/SkiaSharp.Extended.Svg.csproj"       "SkiaSharp.Extended.Svg"
-Test  "./SkiaSharp.Extended.Svg/tests/SkiaSharp.Extended.Svg.Tests.csproj"  "SkiaSharp.Extended.Svg"
+# 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
+}

-exit $lastexitcode;
+# Make sure that packages.config exist.
+if (!(Test-Path $PACKAGES_CONFIG)) {
+    Write-Verbose -Message "Downloading packages.config..."
+    try {
+        $wc = GetProxyEnabledWebClient
+        $wc.DownloadFile("https://cakebuild.net/download/bootstrapper/packages", $PACKAGES_CONFIG)
+    } catch {
+        Throw "Could not download packages.config."
+    }
+}
+
+# Try find NuGet.exe in path if not exists
+if (!(Test-Path $NUGET_EXE)) {
+    Write-Verbose -Message "Trying to find nuget.exe in PATH..."
+    $existingPaths = $Env:Path -Split ';' | Where-Object { (![string]::IsNullOrEmpty($_)) -and (Test-Path $_ -PathType Container) }
+    $NUGET_EXE_IN_PATH = Get-ChildItem -Path $existingPaths -Filter "nuget.exe" | Select -First 1
+    if ($NUGET_EXE_IN_PATH -ne $null -and (Test-Path $NUGET_EXE_IN_PATH.FullName)) {
+        Write-Verbose -Message "Found in PATH at $($NUGET_EXE_IN_PATH.FullName)."
+        $NUGET_EXE = $NUGET_EXE_IN_PATH.FullName
+    }
+}
+
+# Try download NuGet.exe if not exists
+if (!(Test-Path $NUGET_EXE)) {
+    Write-Verbose -Message "Downloading NuGet.exe..."
+    try {
+        $wc = GetProxyEnabledWebClient
+        $wc.DownloadFile($NUGET_URL, $NUGET_EXE)
+    } catch {
+        Throw "Could not download NuGet.exe."
+    }
+}
+
+# Save nuget.exe path to environment to be available to child processed
+$ENV:NUGET_EXE = $NUGET_EXE
+
+# 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_CONFIG)
+    if((!(Test-Path $PACKAGES_CONFIG_MD5)) -Or
+      ($md5Hash -ne (Get-Content $PACKAGES_CONFIG_MD5 ))) {
+        Write-Verbose -Message "Missing or changed package.config hash..."
+        Get-ChildItem -Exclude packages.config,nuget.exe,Cake.Bakery |
+        Remove-Item -Recurse
+    }
+
+    Write-Verbose -Message "Restoring tools from NuGet..."
+    $NuGetOutput = Invoke-Expression "&`"$NUGET_EXE`" install -ExcludeVersion -OutputDirectory `"$TOOLS_DIR`""
+
+    if ($LASTEXITCODE -ne 0) {
+        Throw "An error occurred while restoring NuGet tools."
+    }
+    else
+    {
+        $md5Hash | Out-File $PACKAGES_CONFIG_MD5 -Encoding "ASCII"
+    }
+    Write-Verbose -Message ($NuGetOutput | out-string)
+
+    Pop-Location
+}
+
+# Restore addins from NuGet
+if (Test-Path $ADDINS_PACKAGES_CONFIG) {
+    Push-Location
+    Set-Location $ADDINS_DIR
+
+    Write-Verbose -Message "Restoring addins from NuGet..."
+    $NuGetOutput = Invoke-Expression "&`"$NUGET_EXE`" install -ExcludeVersion -OutputDirectory `"$ADDINS_DIR`""
+
+    if ($LASTEXITCODE -ne 0) {
+        Throw "An error occurred while restoring NuGet addins."
+    }
+
+    Write-Verbose -Message ($NuGetOutput | out-string)
+
+    Pop-Location
+}
+
+# Restore modules from NuGet
+if (Test-Path $MODULES_PACKAGES_CONFIG) {
+    Push-Location
+    Set-Location $MODULES_DIR
+
+    Write-Verbose -Message "Restoring modules from NuGet..."
+    $NuGetOutput = Invoke-Expression "&`"$NUGET_EXE`" install -ExcludeVersion -OutputDirectory `"$MODULES_DIR`""
+
+    if ($LASTEXITCODE -ne 0) {
+        Throw "An error occurred while restoring NuGet modules."
+    }
+
+    Write-Verbose -Message ($NuGetOutput | out-string)
+
+    Pop-Location
+}
+
+# Make sure that Cake has been installed.
+if (!(Test-Path $CAKE_EXE)) {
+    Throw "Could not find Cake.exe at $CAKE_EXE"
+}
+
+
+
+# Build Cake arguments
+$cakeArguments = @("$Script");
+if ($Target) { $cakeArguments += "-target=$Target" }
+if ($Configuration) { $cakeArguments += "-configuration=$Configuration" }
+if ($Verbosity) { $cakeArguments += "-verbosity=$Verbosity" }
+if ($ShowDescription) { $cakeArguments += "-showdescription" }
+if ($DryRun) { $cakeArguments += "-dryrun" }
+$cakeArguments += $ScriptArgs
+
+# Start Cake
+Write-Host "Running build script..."
+&$CAKE_EXE $cakeArguments
+exit $LASTEXITCODE
--- a/build.sh
+++ b/build.sh
@ -0,0 +1,117 @@
+#!/usr/bin/env bash
+
+##########################################################################
+# This is the Cake bootstrapper script for Linux and OS X.
+# This file was downloaded from https://github.com/cake-build/resources
+# Feel free to change this file to fit your needs.
+##########################################################################
+
+# Define directories.
+SCRIPT_DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
+TOOLS_DIR=$SCRIPT_DIR/tools
+ADDINS_DIR=$TOOLS_DIR/Addins
+MODULES_DIR=$TOOLS_DIR/Modules
+NUGET_EXE=$TOOLS_DIR/nuget.exe
+CAKE_EXE=$TOOLS_DIR/Cake/Cake.exe
+PACKAGES_CONFIG=$TOOLS_DIR/packages.config
+PACKAGES_CONFIG_MD5=$TOOLS_DIR/packages.config.md5sum
+ADDINS_PACKAGES_CONFIG=$ADDINS_DIR/packages.config
+MODULES_PACKAGES_CONFIG=$MODULES_DIR/packages.config
+
+# Define md5sum or md5 depending on Linux/OSX
+MD5_EXE=
+if [[ "$(uname -s)" == "Darwin" ]]; then
+    MD5_EXE="md5 -r"
+else
+    MD5_EXE="md5sum"
+fi
+
+# Define default arguments.
+SCRIPT="build.cake"
+CAKE_ARGUMENTS=()
+
+# Parse arguments.
+for i in "$@"; do
+    case $1 in
+        -s|--script) SCRIPT="$2"; shift ;;
+        --) shift; CAKE_ARGUMENTS+=("$@"); break ;;
+        *) CAKE_ARGUMENTS+=("$1") ;;
+    esac
+    shift
+done
+
+# Make sure the tools folder exist.
+if [ ! -d "$TOOLS_DIR" ]; then
+  mkdir "$TOOLS_DIR"
+fi
+
+# Make sure that packages.config exist.
+if [ ! -f "$TOOLS_DIR/packages.config" ]; then
+    echo "Downloading packages.config..."
+    curl -Lsfo "$TOOLS_DIR/packages.config" https://cakebuild.net/download/bootstrapper/packages
+    if [ $? -ne 0 ]; then
+        echo "An error occurred while downloading packages.config."
+        exit 1
+    fi
+fi
+
+# Download NuGet if it does not exist.
+if [ ! -f "$NUGET_EXE" ]; then
+    echo "Downloading NuGet..."
+    curl -Lsfo "$NUGET_EXE" https://dist.nuget.org/win-x86-commandline/latest/nuget.exe
+    if [ $? -ne 0 ]; then
+        echo "An error occurred while downloading nuget.exe."
+        exit 1
+    fi
+fi
+
+# Restore tools from NuGet.
+pushd "$TOOLS_DIR" >/dev/null
+if [ ! -f "$PACKAGES_CONFIG_MD5" ] || [ "$( cat "$PACKAGES_CONFIG_MD5" | sed 's/\r$//' )" != "$( $MD5_EXE "$PACKAGES_CONFIG" | awk '{ print $1 }' )" ]; then
+    find . -type d ! -name . ! -name 'Cake.Bakery' | xargs rm -rf
+fi
+
+mono "$NUGET_EXE" install -ExcludeVersion
+if [ $? -ne 0 ]; then
+    echo "Could not restore NuGet tools."
+    exit 1
+fi
+
+$MD5_EXE "$PACKAGES_CONFIG" | awk '{ print $1 }' >| "$PACKAGES_CONFIG_MD5"
+
+popd >/dev/null
+
+# Restore addins from NuGet.
+if [ -f "$ADDINS_PACKAGES_CONFIG" ]; then
+    pushd "$ADDINS_DIR" >/dev/null
+
+    mono "$NUGET_EXE" install -ExcludeVersion
+    if [ $? -ne 0 ]; then
+        echo "Could not restore NuGet addins."
+        exit 1
+    fi
+
+    popd >/dev/null
+fi
+
+# Restore modules from NuGet.
+if [ -f "$MODULES_PACKAGES_CONFIG" ]; then
+    pushd "$MODULES_DIR" >/dev/null
+
+    mono "$NUGET_EXE" install -ExcludeVersion
+    if [ $? -ne 0 ]; then
+        echo "Could not restore NuGet modules."
+        exit 1
+    fi
+
+    popd >/dev/null
+fi
+
+# Make sure that Cake has been installed.
+if [ ! -f "$CAKE_EXE" ]; then
+    echo "Could not find Cake.exe at '$CAKE_EXE'."
+    exit 1
+fi
+
+# Start Cake
+exec mono "$CAKE_EXE" $SCRIPT "${CAKE_ARGUMENTS[@]}"
--- a/tools/packages.config
+++ b/tools/packages.config
@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+    <package id="Cake" version="0.32.1" />
+</packages>