Adding fn client installer for windows

fn_windows_installer.ps1

@@ -0,0 +1,312 @@
+function Set-EnvironmentVariable
+{
+  param
+  (
+    [Parameter(Mandatory=$true)]
+    [String]
+    $value,
+
+    [Parameter(Mandatory=$true)]
+    [EnvironmentVariableTarget]
+    $target
+  )
+    WriteLog "INFO" "-- Arguments passed --"
+    WriteLog "INFO" "value[$value]"
+    WriteLog "INFO" "target[$target]"
+
+    $path = [Environment]::GetEnvironmentVariable('Path', $target)
+
+	WriteLog "INFO" "Old Path[$path]"
+
+	if( $PATH -notlike "*;"+$value+";*" ){
+        $newpath = $path + ';'+$value+';'
+		[Environment]::SetEnvironmentVariable("Path", $newpath, $target)
+    }
+	$NewPath = ([Environment]::GetEnvironmentVariable('Path', $target))
+    WriteLog "INFO" "New Path[$NewPath]"
+}
+
+Function WriteLog {
+    [CmdletBinding()]
+    Param(
+    [Parameter(Mandatory=$False)]
+    [ValidateSet("INFO","WARN","ERROR","VERBOSE","DEBUG")]
+    [String]
+    $Level = "INFO",
+
+    [Parameter(Mandatory=$True)]
+    [string]
+    $Message
+
+    )
+
+    $Stamp = (Get-Date).toString("yyyy/MM/dd HH:mm:ss")
+    $Line = "$Stamp $Level $Message"
+
+	Add-Content $Logfile -Value $Line
+
+    if($Level -eq "INFO") {
+        Write-Information  -Message $Line -InformationAction Continue
+    } elseif($Level -eq "WARN"){
+		 Write-Warning  -Message $Line
+	} elseif($Level -eq "ERROR"){
+		 Write-Error  -Message $Line
+	} elseif($Level -eq "VERBOSE"){
+		Write-Verbose -Message $Line  -Verbose
+	} elseif($Level -eq "DEBUG"){
+		 Write-Debug  -Message $Line -Debug
+	}else{
+		 Write-Information  -Message $Line -InformationAction Continue
+	}
+}
+
+function DownloadFile
+{
+  param
+  (
+    [Parameter(Mandatory=$true)]
+    [String]
+    $Path,
+	 [Parameter(Mandatory=$true)]
+    [String]
+    $FileName,
+    [Parameter(Mandatory=$true)]
+    [String]
+    $URL
+
+  )
+    $MaxRetries = 3 
+    $RetryCount = 0
+    $SleepTime = 2
+
+    $null = mkdir $Path -Force
+
+    $StartBitsTransferSplat = @{
+        Source        = $URL 
+        Destination   = ($Path + $FileName) 
+        RetryInterval = 60
+    }
+    while ($RetryCount -le $MaxRetries){
+        Try {
+			$Loc = ($Path+$FileName)
+            WriteLog "VERBOSE" "Trying to download file from URL[$URL] at location[$Loc]"
+
+            $null = if((Get-Service BITS).Status -eq "Running") {
+                Start-BitsTransfer @StartBitsTransferSplat -ErrorAction Stop
+            } else {
+                Invoke-WebRequest $URL -OutFile ($Path + $FileName)
+            }
+
+            # To get here, the transfer must have finished, so set the counter
+            # greater than the max value to exit the loop
+            $RetryCount = $MaxRetries + 1
+        } # End Try block
+        Catch {
+            WriteLog "WARN" "Download of file from URL[$URL] failed."
+			WriteLog "WARN" "Going to sleep for [$SleepTime] second and then will try again to download file[$URL]"
+
+            Start-Sleep -Seconds $SleepTime 
+
+            $PSItem.Exception.Message
+            $retryCount += 1
+            $SleepTime = 2 * $SleepTime
+            if($RetryCount -gt $MaxRetries){
+				WriteLog "ERROR" "Reached maximum no of retries while downloading file from URL[$URL]"
+				Throw
+			}
+            WriteLog "WARN" "Attempting retry #: $RetryCount"
+        } # End Catch Block
+    } # End While loop for retries
+	WriteLog "VERBOSE" "Downloaded file from URL[$URL] at location[($Path$FileName)]"
+
+}
+
+function ShowSytemsConfigState
+{	
+	try{
+
+		$OsName=(Get-WmiObject Win32_OperatingSystem).caption
+        $OSArchitecture=((Get-WmiObject Win32_OperatingSystem).OSArchitecture).ToLower()
+        $OsVersion=(Get-ItemProperty "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion").ReleaseId
+
+        $OsBuildDetails = Get-ComputerInfo OsName,OsVersion,OsBuildNumber,OsHardwareAbstractionLayer,WindowsVersion
+
+        $RamInGB =(Get-CimInstance Win32_PhysicalMemory | Measure-Object -Property capacity -Sum).sum /1gb
+
+        $HyperVRequirementVirtualizationFirmwareEnabled=Get-ComputerInfo -property "HyperVRequirementVirtualizationFirmwareEnabled" | Select -expand HyperVRequirementVirtualizationFirmwareEnabled
+
+        $HyperVisorPresent=Get-ComputerInfo -property "HyperVisorPresent" | Select -expand HyperVisorPresent
+
+        $SupportedOsNamesStr = $SupportedOsNames -join ','
+
+        WriteLog "INFO" "#########################################"
+        WriteLog "INFO" "#########################################"
+
+        WriteLog "INFO" "OS Name[$OsName]"
+
+        WriteLog "INFO" "OsBuildDetails[$OsBuildDetails]"
+
+        WriteLog "INFO" "Current System OS Architecture[$OSArchitecture]"
+
+        WriteLog "INFO" "Current System RAM size[$RamInGB GB] "
+
+
+        if($HyperVRequirementVirtualizationFirmwareEnabled -eq $null -or $HyperVRequirementVirtualizationFirmwareEnabled){
+            WriteLog "INFO" "Current system supports virtualization at Firmware(BIOS) level"
+        }else{
+            WriteLog "ERROR" "Current system does not support virtualization at Firmware(BIOS) level. Please enable it at BIOS level."
+        }
+
+		if ((Get-CimInstance Win32_OperatingSystem).Caption -match 'Microsoft Windows 10')
+		{
+			#WriteLog "INFO" "Machine os[Microsoft Windows 10]";
+			if ((Get-WindowsOptionalFeature -FeatureName Microsoft-Hyper-V-All -Online).State -ne 'Enabled')
+			{
+				WriteLog "INFO" "Microsoft Windows 10 Hyper-V is not enabled"
+
+			}else{
+				WriteLog "INFO" "Microsoft Windows 10 Hyper-V is already enabled";
+			}
+		}elseif ((Get-CimInstance Win32_OperatingSystem).Caption -match 'Microsoft Windows Server')
+		{
+			#WriteLog "INFO" "Machine os[Microsoft Windows Server]";
+			if ((Get-WindowsFeature -Name Hyper-V) -eq $false)
+			{
+				WriteLog "INFO" "Microsoft Windows Server Hyper-V is not enabled";
+
+			}else{
+				WriteLog "INFO" "Microsoft Windows Server Hyper-V is already enabled";
+			}
+		}
+
+	} Catch {
+		Throw
+	}
+}
+
+function EnableHyperviser
+{
+	try{
+		WriteLog "INFO" "Verifying Hyper-V in machine..."
+
+		$oldPolicy =Get-ExecutionPolicy
+
+		WriteLog "INFO" "Currrent Execution Policy[$oldPolicy]"
+
+		$Msg = ((Get-CimInstance Win32_OperatingSystem).Caption)
+		WriteLog "INFO" "Windows 10 Details[$Msg]"
+
+		if ((Get-CimInstance Win32_OperatingSystem).Caption -match 'Microsoft Windows 10')
+		{
+			WriteLog "INFO" "Machine os[Microsoft Windows 10]";
+			if ((Get-WindowsOptionalFeature -FeatureName Microsoft-Hyper-V-All -Online).State -ne 'Enabled')
+			{
+				WriteLog "INFO" "Started enabling Microsoft Windows 10 Hyper-V-All"
+
+				Enable-WindowsOptionalFeature -Online -FeatureName Microsoft-Hyper-V -All
+
+				WriteLog "INFO" "Enabled Microsoft Windows 10 Hyper-V-All";
+			}else{
+				WriteLog "INFO" "Microsoft Windows 10 Hyper-V-All is already enabled";
+			}
+		}elseif ((Get-CimInstance Win32_OperatingSystem).Caption -match 'Microsoft Windows Server')
+		{
+			WriteLog "INFO" "Machine os[Microsoft Windows Server]";
+			if ((Get-WindowsFeature -Name Hyper-V) -eq $false)
+			{
+				WriteLog "INFO" "Started enabling Microsoft Windows Server Hyper-V";
+				Install-WindowsFeature -Name Hyper-V -IncludeManagementTools
+				WriteLog "INFO" "Enabled Microsoft Windows Server Hyper-V";
+			}else{
+				WriteLog "INFO" "Microsoft Windows Server Hyper-V is already enabled";
+			}
+		}
+
+	} Catch {
+		Throw
+	}
+}
+
+function InstallFnClient
+{
+	try
+	{
+
+		WriteLog "INFO" "Determining latest release"
+
+		$releases = "https://api.github.com/repos/fnproject/cli/releases"
+
+		$tag = (Invoke-WebRequest -Uri $releases -UseBasicParsing | ConvertFrom-Json)[0].tag_name
+
+		$fn_client_download_url = "https://github.com/fnproject/cli/releases/download/$tag/fn.exe"
+
+		WriteLog "INFO" "Starting fn client download from url[$fn_client_download_url]"
+
+		$fn_client_install_dir=$InstallPath+"\fn\"
+
+		$fn_client_name='fn.exe'
+
+		$null = mkdir $fn_client_install_dir -Force
+
+		WriteLog "INFO" "fn client install dir[$fn_client_install_dir]"
+
+		WriteLog "INFO" "fn client install Log File location[$Logfile]"
+
+		#Downloading
+		DownloadFile "$fn_client_install_dir" "$fn_client_name" "$fn_client_download_url" 
+
+		WriteLog "INFO" "Downloaded fn client at location[$fn_client_install_dir]"
+
+		WriteLog "INFO" "Started Setting path to include fn client executable"
+
+		# target can be User or Machine
+		#$target='User'
+		Set-EnvironmentVariable -value $fn_client_install_dir -target User
+
+		#WriteLog "INFO" "New Path[$NewPath]"
+
+		WriteLog "INFO" "Ended Setting path to include fn client executable"
+
+
+	} Catch {
+		Throw
+	}
+}
+
+function Install
+{	
+	WriteLog "INFO" "Performing Task[$Task] execution"
+	WriteLog "INFO" "Installation Path[$InstallPath]"
+	WriteLog "INFO" "Log file[$Logfile]"
+
+	try{
+        if($Task -eq "get-system-state") {
+			ShowSytemsConfigState
+  		}elseif($Task -eq "fn-client-install"){
+			InstallFnClient
+		} elseif($Task -eq "enable-hyperviser"){
+			EnableHyperviser
+		}else{
+            WriteLog "ERROR" "Invalid argument provided[$Task]."
+            Throw
+		}
+	} Catch {
+		Throw
+	}
+}
+
+
+######################################################################################################
+#####################Main Start#######################################################################
+######################################################################################################
+
+$Task=$args[0]
+
+#Configuring all directories required for docker install
+$InstallPath = "c:\fn_install"
+$LogPath = $InstallPath+"\logs"
+$null = mkdir $LogPath -Force
+$Logfile = ($LogPath + "\fn_install.log")
+
+#Trigering installation
+Install