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+[[!comment format=mdwn
+ username="joey"
+ subject="""comment 1"""
+ date="2015-04-19T16:07:24Z"
+ content="""
+Propellor makes it very easy to put together a property like this.
+
+Let's start with a property that combines the two properties you mentioned:
+
+	hasLoginShell :: UserName -> FilePath -> Property
+	hasLoginShell user shell = shellSetTo user shell `requires` shellEnabled shell
+
+The shellEnabled property can be easily written using propellor's file
+manipulation properties.
+
+	-- Need to add an import to the top of the source file.
+	import qualified Propellor.Property.File as File
+
+	shellEnabled :: FilePath -> Property
+	shellEnabled shell = "/etc/shells" `File.containsLine` shell
+
+And then, we want to actually change the user's shell. The `chsh(1)`
+program can do that, so we can simply tell propellor the command line to
+run:
+
+	shellSetTo :: UserName -> FilePath -> Property
+	shellSetTo user shell = cmdProperty "chsh" ["--shell", shell, user]
+
+The only remaining problem with this is that shellSetTo runs chsh every
+time, and propellor will always display that it's made a change each time
+it runs, even when it didn't really do much. Now, there's an easy way to
+avoid that problem, we could just tell propellor that it's a trivial
+property, and then it will run chsh every time and not think it made any
+change:
+	
+	shellSetTo :: UserName -> FilePath -> Property
+	shellSetTo user shell = trivial $
+		cmdProperty "chsh" ["--shell", shell, user]
+
+But, it's not much harder to do this right. Let's make the property
+check if the user's shell is already set to the desired value and avoid
+doing anything in that case.
+
+	shellSetTo :: UserName -> FilePath -> Property
+	shellSetTo user shell = check needchangeshell $
+		cmdProperty "chsh" ["--shell", shell, user]
+	  where
+		needchangeshell = do
+			currshell <- userShell <$> getUserEntryForName user
+			return (currshell /= shell)
+
+And that will probably all work, although I've not tested it. You might
+want to throw in some uses of `describe` to give the new properties
+more useful descriptions.
+
+I hope this has been helpful as an explanation of how to add properties to
+Propellor, and if you get these properties to work, a patch adding them
+to Propellor.User would be happily merged.
+"""]]