mount and unmount commands added.

src/main.cr

@@ -60,6 +60,12 @@ class RootFS::Context
 			"restore" => ->(args : Array(String)){
 				RootFS.load(args[0]).restore(args[1])
 			},
+			"mount" => ->(args : Array(String)){
+				RootFS.load(args[0]).mount(args[1]?)
+			},
+			"unmount" => ->(args : Array(String)){
+				RootFS.load(args[0]).unmount(args[1]?)
+			},
 			# FIXME: This needs access to the list of commands.
 			"help" => ->(args : Array(String)){
 				STDOUT << options_parser << "\n"
@@ -168,13 +174,23 @@ class RootFS::RootFS
 	end
 
 	def mount(directory = nil)
-		show!
-		puts "UNIMPLEMENTED: binding file systems here"
+		if directory
+			execute "mount --bind '#{directory}' '#{@directory}/#{directory}'"
+			return
+		end
+
+		mount "/proc"
+		mount "/sys"
 	end
 
 	def unmount(directory = nil)
-		show!
-		puts "UNIMPLEMENTED: unbinding file systems here"
+		if directory
+			execute "umount '#{@directory}/#{directory}'"
+			return
+		end
+
+		unmount "/proc"
+		unmount "/sys"
 	end
 
 	def show!