[xaprepare] Add Disk information to output (#6711)

Sometimes a CI build will fail due to insufficient disk space:

	System.IO.IOException: No space left on device
	   at System.IO.FileStream.WriteNative(ReadOnlySpan`1 source)
	   at System.IO.FileStream.FlushWriteBuffer()
	   …

What we *don't* know is how much free space there was in the first
place, or how much space we've consumed during the build.

Update `xaprepare` to print out the current disk space usage at the
beginning of the build.  This output will be visible from the
**make jenkins** step output.

macOS will print out `df -h` output:

	=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
	Detecting operating system
	=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
	

	     OS type: Darwin
	   OS flavor: macOS
	     OS name: Mac OS X
	  OS release: 10.15.7 (19H2)
	     OS bits: x86_64
	   CPU count: 12
	   Disk Info: 
	Filesystem      Size   Used  Avail Capacity iused      ifree %iused  Mounted on
	/dev/disk1s1   466Gi   10Gi  267Gi     4%  488254 4881964626    0%   /
	devfs          186Ki  186Ki    0Bi   100%     642          0  100%   /dev
	/dev/disk1s6   466Gi  178Gi  267Gi    40% 2099549 4880353331    0%   /System/Volumes/Data
	/dev/disk1s4   466Gi  2.0Gi  267Gi     1%       2 4882452878    0%   /private/var/vm
	/dev/disk1s5   9.3Gi  7.8Gi  1.5Gi    84%     346   97655934    0%   /Volumes/BotDeploy
	map auto_home    0Bi    0Bi    0Bi   100%       0          0  100%   /System/Volumes/Data/home
	/dev/disk1s3   466Gi  504Mi  267Gi     1%      50 4882452830    0%   /Volumes/Recovery

Linux will print out `df -h` output:

	=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
	Detecting operating system
	=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=


	     OS type: Linux
	   OS flavor: Debian
	     OS name: Ubuntu
	  OS release: 20.04
	     OS bits: x86_64
	   CPU count: 8
	   Disk Info: 
	Filesystem      Size  Used Avail Use% Mounted on
	/dev/root        84G   55G   29G  66% /
	devtmpfs         16G     0   16G   0% /dev
	tmpfs            16G   12K   16G   1% /dev/shm
	tmpfs           3.2G  1.1M  3.2G   1% /run
	tmpfs           5.0M     0  5.0M   0% /run/lock
	tmpfs            16G     0   16G   0% /sys/fs/cgroup
	/dev/loop0       62M   62M     0 100% /snap/core20/1328
	/dev/sda15      105M  5.2M  100M   5% /boot/efi
	/dev/loop2       68M   68M     0 100% /snap/lxd/21835
	/dev/loop1       44M   44M     0 100% /snap/snapd/14549

Windows will use the values from [`System.IO.DriveInfo`][0]:

	=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
	Detecting operating system
	=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
	
	Visual Studio detected in C:\Program Files\Microsoft Visual Studio\2022\Enterprise
	MSBuild detected at C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Current\Bin\MSBuild.exe
	
	     OS type: Windows
	   OS flavor: Windows 10
	     OS name: Microsoft Windows 10 [Version 10.0.20348]
	  OS release: 10.0.20348
	     OS bits: x86
	   CPU count: 8
	   Disk Info: 
	Drive	TotalSize	AvailableFreeSpace
	C:\	256GB	105GB

[0]: https://docs.microsoft.com/en-us/dotnet/api/system.io.driveinfo?view=net-6.0

Author: dellis1972

build-tools/xaprepare/xaprepare/Application/Context.cs

@@ -763,12 +763,14 @@ public async Task<bool> Init (string? scenarioName = null)
 			InitOS ();
 
 			Log.StatusLine ();
-			Log.StatusLine ("   OS type: ", OS.Type, tailColor: Log.InfoColor);
-			Log.StatusLine (" OS flavor: ", OS.Flavor, tailColor: Log.InfoColor);
-			Log.StatusLine ("   OS name: ", OS.Name, tailColor: Log.InfoColor);
-			Log.StatusLine ("OS release: ", OS.Release, tailColor: Log.InfoColor);
-			Log.StatusLine ("   OS bits: ", OS.Architecture, tailColor: Log.InfoColor);
-			Log.StatusLine (" CPU count: ", OS.CPUCount.ToString (), tailColor: Log.InfoColor);
+			Log.StatusLine ("     OS type: ", OS.Type, tailColor: Log.InfoColor);
+			Log.StatusLine ("   OS flavor: ", OS.Flavor, tailColor: Log.InfoColor);
+			Log.StatusLine ("     OS name: ", OS.Name, tailColor: Log.InfoColor);
+			Log.StatusLine ("  OS release: ", OS.Release, tailColor: Log.InfoColor);
+			Log.StatusLine ("     OS bits: ", OS.Architecture, tailColor: Log.InfoColor);
+			Log.StatusLine ("   CPU count: ", OS.CPUCount.ToString (), tailColor: Log.InfoColor);
+			Log.StatusLine ("   Disk Info: ", string.Empty, tailColor: Log.InfoColor);
+			Log.StatusLine (string.Empty, OS.DiskInformation, tailColor: Log.InfoColor);
 			Log.StatusLine ();
 
 			if (EnableAllTargets) {
@@ -784,6 +786,8 @@ public async Task<bool> Init (string? scenarioName = null)
 				return false;
 			}
 
+			Log.StatusLine ();
+
 			Tools.Init (this);
 
 			if (SelectedScenario.NeedsGitSubmodules) {

build-tools/xaprepare/xaprepare/Application/Utilities.cs

@@ -446,6 +446,12 @@ public static void FormatSize (ulong dSize, out decimal value, out string unit)
 			value = SignificantDigits (value, 3);
 		}
 
+		public static string SizeToString (long dSize)
+		{
+			Utilities.FormatSize ((ulong)dSize, out decimal value, out string unit);
+			return $"{value}{unit}";
+		}
+
 		// Creates numbers with maxDigitCount significant digits or less
 		static decimal SignificantDigits (decimal number, int maxDigitCount)
 		{

build-tools/xaprepare/xaprepare/OperatingSystems/OS.cs

@@ -36,6 +36,8 @@ abstract class OS : AppObject
 		/// </summary>
 		public uint CPUCount => (uint)Environment.ProcessorCount;
 
+		public string DiskInformation { get; protected set; } = string.Empty;
+
 		/// <summary>
 		///   A dictionary of variables to export in environment of all the executed programs, scripts etc.
 		/// </summary>

build-tools/xaprepare/xaprepare/OperatingSystems/Unix.cs

@@ -18,6 +18,7 @@ abstract partial class Unix : OS
 		protected Unix (Context context) : base (context)
 		{
 			Architecture = Utilities.GetStringFromStdout ("uname", "-m").Trim ();
+			DiskInformation =  Utilities.GetStringFromStdout ("df", "-h").Trim ();
 		}
 
 		string GetCompiler (string fromEnv, string defaultName)

build-tools/xaprepare/xaprepare/OperatingSystems/Windows.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Text;
 
 using Xamarin.Android.Tools.VSWhere;
 
@@ -47,6 +48,7 @@ public Windows (Context context) : base (context)
 			Name = osinfo.FullName;
 			Architecture = Is64Bit ? "x86" : "x86_64"; // Not good enough! (ARM)
 			Release = $"{osinfo.Major}.{osinfo.Minor}.{osinfo.Build}";
+			DiskInformation = DiskInfo ();
 		}
 
 		public override string Which (string programPath, bool required = true)
@@ -128,5 +130,17 @@ string GetHomeDir ()
 
 			return $"{homeDrive}{homeDir}";
 		}
+
+		string DiskInfo ()
+		{
+			var sb = new StringBuilder ();
+			sb.AppendLine ("Drive\tTotalSize\tAvailableFreeSpace");
+			foreach (DriveInfo d in DriveInfo.GetDrives ()) {
+				if (!d.IsReady)
+					continue;
+				sb.AppendLine ($"{d.Name}\t{Utilities.SizeToString (d.TotalSize)}\t{Utilities.SizeToString (d.AvailableFreeSpace)}");
+			}
+			return sb.ToString ();
+		}
 	};
 }