Introduce fallbacks when getting the user's shell

2 files changed, 25 insertions, 2 deletions

diff --git a/terminal.vala b/terminal.vala
index c6c2525..a7cfb6b 100644
--- a/terminal.vala
+++ b/terminal.vala
@@ -71,7 +71,7 @@ class Terminal : Gtk.Overlay {
 
 			var argv = args[1:args.length];
 			if (argv.length == 0) {
-				argv = { Environment.get_variable("SHELL") };
+				argv = { get_shell() };
 			}
 
 			vte.spawn_sync(DEFAULT, null, argv, null, SEARCH_PATH, null, null, null);
@@ -145,6 +145,20 @@ class Terminal : Gtk.Overlay {
 		}
 	}
 
+	string get_shell() {
+		var env_shell = Environment.get_variable("SHELL");
+		if (env_shell != null && env_shell.length > 0){
+			return env_shell;
+		}
+
+		unowned Posix.Passwd pw = Posix.getpwuid(Posix.getuid());
+		if (pw != null && pw.pw_shell.length > 0) {
+			return pw.pw_shell;
+		}
+
+		return "/bin/sh";
+	}
+
 	bool match_modifiers(int state, Gdk.ModifierType modifiers) {
 		return (state & modifiers) == modifiers;
 	}
diff --git a/weltschmerz.1 b/weltschmerz.1
index bb834b5..eaf7f0c 100644
--- a/weltschmerz.1
+++ b/weltschmerz.1
@@ -18,8 +18,17 @@ reload its configuration whilst running.
 .Pp
 .Nm
 executes the given command, or the program specified in the
-.Em SHELL
+.Ev SHELL
 environment variable if no command was given.
+If the
+.Ev SHELL
+environment variable is unset or empty,
+.Nm
+will fall back to the user's shell as configured in
+.Pa /etc/passwd ,
+or finally use
+.Pa /bin/sh
+if there is no such entry.
 .Pp
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