add config and ver params to windows installer

install/install_windows.psm1

@@ -0,0 +1,169 @@
+New-Module -name circonus-install -ScriptBlock {
+  $usage = "Circonus Unified Agent Install Help
+
+Usage
+
+  install --key <apikey>
+
+Options
+
+  [--key]         Circonus API key/token
+  [--config]      Absolute path to a configuration file
+  [--ver]         CUA version number
+  [--help]        This message
+
+Note: Provide an authorized app for the key or ensure api 
+      key/token has adequate privileges (default app state:allow)"
+  $installpath = "${env:systemdrive}\Program Files\Circonus\Circonus-Unified-Agent"
+  $name = "circonus-unified-agent"
+  $repo = "circonus-labs/${name}"
+  $releases = "https://api.github.com/repos/${repo}/releases"
+  $zip = "${name}.zip"
+
+  function New-Location {
+    if (!(Test-Path $installpath)) {
+      New-Item -ItemType Directory -Force -Path $installpath
+    }
+    else {
+      return
+    }
+  }
+
+  function Get-Latest-Release {
+    Write-Host "Determining latest release..."
+    $tag = (Invoke-WebRequest $releases -UseBasicParsing | ConvertFrom-Json)[0].tag_name
+    $tagrawv = $tag.substring(1)
+    $download = "https://github.com/${repo}/releases/download/${tag}/circonus-unified-agent_${tagrawv}_windows_x86_64.zip"
+    return $download
+  }
+
+  function Get-Release {
+    param ($tag)
+    Write-Host "Generating URL for release $tag"
+    $tagrawv = $tag.substring(1)
+    $download = "https://github.com/${repo}/releases/download/${tag}/circonus-unified-agent_${tagrawv}_windows_x86_64.zip"
+    return $download
+  }
+
+  function Get-Package {
+    param ($downloadpath)
+    Write-Host "Downloading Package..."
+    Invoke-WebRequest $downloadpath -Out "${env:temp}\${zip}"
+  }
+
+  function Expand-Package {
+    Write-Host "Expanding archive and installing..."
+    Expand-Archive -Path "${env:temp}\${zip}" -DestinationPath "${env:systemdrive}\Program Files\Circonus\Circonus-Unified-Agent"
+  }
+
+  function Enable-Service {
+    Write-Host ".........."
+    & "${installpath}\sbin\${name}d.exe" --service install --config "${installpath}\etc\circonus-unified-agent.conf"
+    Set-Service -Name circonus-unified-agent -StartupType Automatic
+  }
+
+  function Set-Config-Key {
+    param ($token)
+    $file = "${installpath}\etc\circonus-unified-agent.conf"
+  (Get-Content $file) -replace '  api_token = ""', "  api_token = `"${token}`"" | Set-Content $file
+  }
+
+
+  function Set-Config-Default {
+    Write-Host "Copying config..."
+    Move-Item -Path "${installpath}\etc\example-circonus-unified-agent_windows.conf" -Destination "${installpath}\etc\circonus-unified-agent.conf"
+  }
+
+  function Set-Config-With-Config {
+    param ($configfile)
+    Write-Host "Copying config..."
+    Copy-Item -Path "${configfile}" -Destination "${installpath}\etc\circonus-unified-agent.conf"
+  }
+
+  function Cleanup {
+    Write-Host "Cleaning up..."
+    Remove-Item -Path "${env:temp}\${zip}" -Force
+  }
+
+  function Start-Service {
+    Write-Host "Starting service..."
+    Set-Service -Name circonus-unified-agent -Status Running -PassThru
+  }
+
+  function Install-Project {
+    <#
+  .SYNOPSIS
+  Install Circonus Unified Agent for Windows
+  .DESCRIPTION
+  Install Circonus Unified Agent for Windows
+  .EXAMPLE
+  iex; install -key <your key here>
+#>
+    param (
+      # Circonus API Key
+      [Parameter()]
+      [string]$key,
+      [string]$config,
+      [string]$ver,
+      # display help
+      [bool]$help
+    )
+    if ($help) {
+      Write-Host $usage
+      return
+    }
+    if ($key -eq "" -And $config -eq "" ) {
+      Write-Host "Circonus API Key or Config file path is required."
+      Write-Host $usage
+      return
+    }
+    if ((Test-Path -Path "${installpath}\sbin\circonus-unified-agentd.exe" -PathType Leaf)) {
+      Write-Host "Circonus-Unified-Agent is already installed."
+      return
+    }
+    if ([Environment]::Is64BitProcess -ne [Environment]::Is64BitOperatingSystem) {
+      Write-Host "Circonus-Unified-Agent is only supported on 64-Bit Windows releases."
+      return
+    }
+
+    # Create the install directory
+    New-Location
+    # Determine the latest release
+
+    $release = ""
+    if ($ver -ne "") {
+      $release = Get-Release($ver)
+    }
+    else {
+      $release = Get-Latest-Release
+    }
+
+
+    # Fetch the latest CUA version zip file
+    Get-Package($release)
+    # Unarchive the zip file into their proper location
+    Expand-Package
+    # Set the service up
+    Enable-Service
+
+    # Setup the configuration file
+    if ($config -ne "" ) {
+      Set-Config-With-Config($config)
+    }
+    else {
+      Set-Config-Default
+    }
+
+    if ($key -ne "") {
+      # Replace the api key if not set
+      Set-Config-Key($key)
+    }
+
+    # Cleanup tmp dir
+    Cleanup
+    # Start the service
+    Start-Service
+  }
+  Set-Alias install -value Install-Project
+  Export-ModuleMember -function 'Install-Project' -alias 'install'
+}