ChocolateyLocalInstall.ps1

# use an internal repository to download Chocolatey nupkg to the local path:
$packageRepo = '<INSERT REPO URL>'
# uncomment if you want to download the file from a remote OData (HTTP/HTTPS) internal url (such as Artifactory, Nexus, ProGet, or Chocolatey.Server)
#$searchUrl = ($packageRepo.Trim('/'), 'Packages()?$filter=(Id%20eq%20%27chocolatey%27)%20and%20IsLatestVersion') -join '/'

# UPDATE THIS PATH
$localChocolateyPackageFilePath = "$env:SystemDrive\choco-setup\packages\chocolatey.0.10.0.nupkg"
# Determine unzipping method
# 7zip is the most compatible, but you need an internally hosted 7za.exe.
# Make sure the version matches for the arguments as well.
# Built-in does not work with Server Core, but if you have PowerShell 5
# it uses Expand-Archive instead of COM
$unzipMethod = 'builtin'
#$unzipMethod = '7zip'
#$7zipUrl = 'https://chocolatey.org/7za.exe' (download this file, host internally, and update this to internal)

$ChocoInstallPath = "$($env:SystemDrive)\ProgramData\Chocolatey\bin"
$env:ChocolateyInstall = "$($env:SystemDrive)\ProgramData\Chocolatey"
$env:Path += ";$ChocoInstallPath"
$DebugPreference = "Continue";
# if you really want to see debugging output related to the
# installation, uncomment the next line
#$env:ChocolateyEnvironmentDebug = 'true'

function Get-Downloader {
param (
  [string]$url
 )

  $downloader = new-object System.Net.WebClient

  $defaultCreds = [System.Net.CredentialCache]::DefaultCredentials
  if ($defaultCreds -ne $null) {
    $downloader.Credentials = $defaultCreds
  }

  $ignoreProxy = $env:chocolateyIgnoreProxy
  if ($ignoreProxy -ne $null -and $ignoreProxy -eq 'true') {
    Write-Debug "Explicitly bypassing proxy due to user environment variable"
    $downloader.Proxy = [System.Net.GlobalProxySelection]::GetEmptyWebProxy()
  } else {
    # check if a proxy is required
    $explicitProxy = $env:chocolateyProxyLocation
    $explicitProxyUser = $env:chocolateyProxyUser
    $explicitProxyPassword = $env:chocolateyProxyPassword
    if ($explicitProxy -ne $null -and $explicitProxy -ne '') {
      # explicit proxy
      $proxy = New-Object System.Net.WebProxy($explicitProxy, $true)
      if ($explicitProxyPassword -ne $null -and $explicitProxyPassword -ne '') {
        $passwd = ConvertTo-SecureString $explicitProxyPassword -AsPlainText -Force
        $proxy.Credentials = New-Object System.Management.Automation.PSCredential ($explicitProxyUser, $passwd)
      }

      Write-Debug "Using explicit proxy server '$explicitProxy'."
      $downloader.Proxy = $proxy

    } elseif (!$downloader.Proxy.IsBypassed($url)) {
      # system proxy (pass through)
      $creds = $defaultCreds
      if ($creds -eq $null) {
        Write-Debug "Default credentials were null. Attempting backup method"
        $cred = get-credential
        $creds = $cred.GetNetworkCredential();
      }

      $proxyaddress = $downloader.Proxy.GetProxy($url).Authority
      Write-Debug "Using system proxy server '$proxyaddress'."
      $proxy = New-Object System.Net.WebProxy($proxyaddress)
      $proxy.Credentials = $creds
      $downloader.Proxy = $proxy
    }
  }

  return $downloader
}

function Download-File {
param (
  [string]$url,
  [string]$file
 )
  #Write-Output "Downloading $url to $file"
  $downloader = Get-Downloader $url

  $downloader.DownloadFile($url, $file)
}

function Download-Package {
param (
  [string]$packageODataSearchUrl,
  [string]$file
 )
  $downloader = Get-Downloader $packageODataSearchUrl

  Write-Output "Querying latest package from $packageODataSearchUrl"
  [xml]$pkg = $downloader.DownloadString($packageODataSearchUrl)
  $packageDownloadUrl = $pkg.feed.entry.content.src

  Write-Output "Downloading $packageDownloadUrl to $file"
  $downloader.DownloadFile($packageDownloadUrl, $file)
}

function Install-LocalChocolateyPackage {
param (
  [string]$chocolateyPackageFilePath = ''
)

  if ($chocolateyPackageFilePath -eq $null -or $chocolateyPackageFilePath -eq '') {
    throw "You must specify a local package to run the local install."
  }

  if (!(Test-Path($chocolateyPackageFilePath))) {
    throw "No file exists at $chocolateyPackageFilePath"
  }

  if ($env:TEMP -eq $null) {
    $env:TEMP = Join-Path $env:SystemDrive 'temp'
  }
  $chocTempDir = Join-Path $env:TEMP "chocolatey"
  $tempDir = Join-Path $chocTempDir "chocInstall"
  if (![System.IO.Directory]::Exists($tempDir)) {[System.IO.Directory]::CreateDirectory($tempDir)}
  $file = Join-Path $tempDir "chocolatey.zip"
  Copy-Item $chocolateyPackageFilePath $file -Force

  # unzip the package
  Write-Output "Extracting $file to $tempDir..."
  if ($unzipMethod -eq '7zip') {
    $7zaExe = Join-Path $tempDir '7za.exe'
    if (-Not (Test-Path ($7zaExe))) {
      Write-Output "Downloading 7-Zip commandline tool prior to extraction."
      # download 7zip
      Download-File $7zipUrl "$7zaExe"
    }

    $params = "x -o`"$tempDir`" -bd -y `"$file`""
    # use more robust Process as compared to Start-Process -Wait (which doesn't
    # wait for the process to finish in PowerShell v3)
    $process = New-Object System.Diagnostics.Process
    $process.StartInfo = New-Object System.Diagnostics.ProcessStartInfo($7zaExe, $params)
    $process.StartInfo.RedirectStandardOutput = $true
    $process.StartInfo.UseShellExecute = $false
    $process.StartInfo.WindowStyle = [System.Diagnostics.ProcessWindowStyle]::Hidden
    $process.Start() | Out-Null
    $process.BeginOutputReadLine()
    $process.WaitForExit()
    $exitCode = $process.ExitCode
    $process.Dispose()

    $errorMessage = "Unable to unzip package using 7zip. Perhaps try setting `$env:chocolateyUseWindowsCompression = 'true' and call install again. Error:"
    switch ($exitCode) {
      0 { break }
      1 { throw "$errorMessage Some files could not be extracted" }
      2 { throw "$errorMessage 7-Zip encountered a fatal error while extracting the files" }
      7 { throw "$errorMessage 7-Zip command line error" }
      8 { throw "$errorMessage 7-Zip out of memory" }
      255 { throw "$errorMessage Extraction cancelled by the user" }
      default { throw "$errorMessage 7-Zip signalled an unknown error (code $exitCode)" }
    }
  } else {
    if ($PSVersionTable.PSVersion.Major -lt 5) {
      try {
        $shellApplication = new-object -com shell.application
        $zipPackage = $shellApplication.NameSpace($file)
        $destinationFolder = $shellApplication.NameSpace($tempDir)
        $destinationFolder.CopyHere($zipPackage.Items(),0x10)
      } catch {
        throw "Unable to unzip package using built-in compression. Set `$env:chocolateyUseWindowsCompression = 'false' and call install again to use 7zip to unzip. Error: `n $_"
      }
    } else {
      Expand-Archive -Path "$file" -DestinationPath "$tempDir" -Force
    }
  }

  # Call chocolatey install
  Write-Output "Installing chocolatey on this machine"
  $toolsFolder = Join-Path $tempDir "tools"
  $chocInstallPS1 = Join-Path $toolsFolder "chocolateyInstall.ps1"

  & $chocInstallPS1

  Write-Output 'Ensuring chocolatey commands are on the path'
  $chocInstallVariableName = "ChocolateyInstall"
  $chocoPath = [Environment]::GetEnvironmentVariable($chocInstallVariableName)
  if ($chocoPath -eq $null -or $chocoPath -eq '') {
    $chocoPath = 'C:\ProgramData\Chocolatey'
  }

  $chocoExePath = Join-Path $chocoPath 'bin'

  if ($($env:Path).ToLower().Contains($($chocoExePath).ToLower()) -eq $false) {
    $env:Path = [Environment]::GetEnvironmentVariable('Path',[System.EnvironmentVariableTarget]::Machine);
  }
}

# Idempotence - do not install Chocolatey if it is already installed
if (!(Test-Path $ChocoInstallPath)) {
  # download the package to the local path
  if ($searchUrl) {
    Download-Package $searchUrl $localChocolateyPackageFilePath
  }

  # Install Chocolatey
  Install-LocalChocolateyPackage $localChocolateyPackageFilePath
}