Add a note about updating travelynx

README.md

@@ -55,6 +55,28 @@ Please open an issue on <https://github.com/derf/travelynx/issues> or send a
 mail to derf+travelynx@finalrewind.org if there is anything missing or
 ambiguous in this setup manual.
 
+Updating
+---
+
+It is recommended to run travelynx directly from the git repository. When
+updating, the workflow depends on whether schema updates need to applied
+or not.
+
+```
+git pull
+chmod -R a+rX . # only needed if travelynx is running under a different user
+if perl index.pl database has-current-schema; then
+    systemctl reload travelynx
+else
+    systemctl stop travelynx
+    perl index.pl migrate
+    systemctl start travelynx
+fi
+```
+
+Note that this is subject to change -- the application may perform schema
+updates automatically in the future.
+
 Usage
 ---
 

lib/Travelynx/Command/database.pm

@@ -106,6 +106,14 @@ sub run {
 			$dbh->commit;
 		}
 	}
+	elsif ( $command eq 'has-current-schema' ) {
+		if ( get_schema_version($dbh) == $#migrations ) {
+			say "yes";
+		}
+		else {
+			say "no";
+		}
+	}
 	else {
 		$self->help;
 	}
@@ -120,7 +128,7 @@ __END__
 
 =head1 SYNOPSIS
 
-  Usage: index.pl database <setup|migrate>
+  Usage: index.pl database <setup|migrate|has-current-schema>
 
   Upgrades the database layout to the latest schema.