Add a friendly error message if installation fails due to lack of disk space.

src/FileUtils.cpp

@@ -67,6 +67,8 @@ FileUtils::IOException::Type FileUtils::IOException::type() const
 			return NoError;
 		case EROFS:
 			return ReadOnlyFileSystem;
+		case ENOSPC:
+			return DiskFull;
 		default:
 			return Unknown;
 	}

src/FileUtils.h

@@ -32,7 +32,8 @@ class FileUtils
 					  * provided by the OS.
 					  */
 					Unknown,
-					ReadOnlyFileSystem
+					ReadOnlyFileSystem,
+					DiskFull
 				};
 
 				virtual const char* what() const throw ()

src/UpdateInstaller.cpp

@@ -87,6 +87,9 @@ std::string UpdateInstaller::friendlyErrorForError(const FileUtils::IOException&
 							"Re-install it to a location that can be updated and run it from there.";
 #endif
 			break;
+		case FileUtils::IOException::DiskFull:
+			friendlyError = "The disk is full.  Please free up some space and try again.";
+			break;
 		default:
 			break;
 	}