diff --git a/eng/scripts/common.psm1 b/eng/scripts/common.psm1
new file mode 100644
index 0000000000..3a31f2a023
--- /dev/null
+++ b/eng/scripts/common.psm1
@@ -0,0 +1,122 @@
+$ErrorActionPreference = 'Stop'
+# Update the default TLS support to 1.2
+[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
+
+function Invoke-Block([scriptblock]$cmd, [string]$WorkingDir = $null) {
+    if ($WorkingDir) {
+        Push-Location $WorkingDir
+    }
+
+    try {
+
+        $cmd | Out-String | Write-Verbose
+        & $cmd
+
+        # Need to check both of these cases for errors as they represent different items
+        # - $?: did the powershell script block throw an error
+        # - $lastexitcode: did a windows command executed by the script block end in error
+        if ((-not $?) -or ($lastexitcode -ne 0)) {
+            if ($error -ne $null)
+            {
+                Write-Warning $error[0]
+            }
+            throw "Command failed to execute: $cmd"
+        }
+    }
+    finally {
+        if ($WorkingDir) {
+            Pop-Location
+        }
+    }
+}
+
+function SaveXml([xml]$xml, [string]$path) {
+    Write-Verbose "Saving to $path"
+    $ErrorActionPreference = 'stop'
+
+    $settings = New-Object System.XML.XmlWriterSettings
+    $settings.OmitXmlDeclaration = $true
+    $settings.Encoding = New-Object System.Text.UTF8Encoding( $true )
+    $writer = [System.XML.XMLTextWriter]::Create($path, $settings)
+    $xml.Save($writer)
+    $writer.Close()
+}
+
+function LoadXml([string]$path) {
+    Write-Verbose "Reading from $path"
+
+    $ErrorActionPreference = 'stop'
+    $obj = new-object xml
+    $obj.PreserveWhitespace = $true
+    $obj.Load($path)
+    return $obj
+}
+
+function Get-MSBuildPath {
+    param(
+        [switch]$Prerelease,
+        [string[]]$Requires
+    )
+
+    $vsInstallDir = $null
+    if ($env:VSINSTALLDIR -and (Test-Path $env:VSINSTALLDIR)) {
+        $vsInstallDir = $env:VSINSTALLDIR
+        Write-Verbose "Using VSINSTALLDIR=$vsInstallDir"
+    }
+    else {
+        $vswhere = "${env:ProgramFiles(x86)}/Microsoft Visual Studio/Installer/vswhere.exe"
+        Write-Verbose "Using vswhere.exe from $vswhere"
+
+        if (-not (Test-Path $vswhere)) {
+            Write-Error "Missing prerequisite: could not find vswhere"
+        }
+
+        [string[]] $vswhereArgs = @()
+
+        if ($Prerelease) {
+            $vswhereArgs += '-prerelease'
+        }
+
+        if ($Requires) {
+            foreach ($r in $Requires) {
+                $vswhereArgs += '-requires', $r
+            }
+        }
+
+        $installs = & $vswhere -format json -version '[15.0, 16.0)' -latest -products * @vswhereArgs | ConvertFrom-Json
+        if (!$installs) {
+            Write-Error "Missing prerequisite: could not find any installations of Visual Studio"
+        }
+
+        $vs = $installs | Select-Object -First 1
+        $vsInstallDir = $vs.installationPath
+        Write-Host "Using $($vs.displayName)"
+    }
+
+    $msbuild = Join-Path  $vsInstallDir 'MSBuild/15.0/bin/msbuild.exe'
+    if (!(Test-Path $msbuild)) {
+        Write-Error "Missing prerequisite: could not find msbuild.exe"
+    }
+    return $msbuild
+}
+
+function Get-RemoteFile([string]$RemotePath, [string]$LocalPath) {
+    if ($RemotePath -notlike 'http*') {
+        Copy-Item $RemotePath $LocalPath
+        return
+    }
+
+    $retries = 10
+    while ($retries -gt 0) {
+        $retries -= 1
+        try {
+            Invoke-WebRequest -UseBasicParsing -Uri $RemotePath -OutFile $LocalPath
+            return
+        }
+        catch {
+            Write-Verbose "Request failed. $retries retries remaining"
+        }
+    }
+
+    Write-Error "Download failed: '$RemotePath'."
+}
diff --git a/src/Installers/Windows/build.ps1 b/src/Installers/Windows/build.ps1
index a3629b2683..c1fbff4043 100644
--- a/src/Installers/Windows/build.ps1
+++ b/src/Installers/Windows/build.ps1
@@ -20,7 +20,7 @@ param(
 
 $ErrorActionPreference = 'Stop'
 $repoRoot = Resolve-Path "$PSScriptRoot/../../../"
-Import-Module -Scope Local "$repoRoot/scripts/common.psm1" -Force
+Import-Module -Scope Local "$repoRoot/eng/scripts/common.psm1" -Force
 $msbuild = Get-MSBuildPath -Prerelease -requires 'Microsoft.VisualStudio.Component.VC.Tools.x86.x64'
 
 $harvestRoot = "$repoRoot/obj/sfx/"
diff --git a/test/Cli.FunctionalTests/run-tests.ps1 b/test/Cli.FunctionalTests/run-tests.ps1
index 325ca8a470..1b66b79e14 100644
--- a/test/Cli.FunctionalTests/run-tests.ps1
+++ b/test/Cli.FunctionalTests/run-tests.ps1
@@ -51,7 +51,7 @@ $ErrorActionPreference = 'Stop'
 Set-StrictMode -Version 1
 
 $repoRoot = Resolve-Path "$PSScriptRoot/../../"
-Import-Module "$repoRoot/scripts/common.psm1" -Scope Local -Force
+Import-Module "$repoRoot/eng/scripts/common.psm1" -Scope Local -Force
 
 # This ID corresponds to the ProdCon build number
 Write-Host "ProductBuildId:  $env:PRODUCTBUILDID"