Travis: Add check for update entries not listed in base dumps.

* Will mark the travis build as failed when the database updater is broken.

contrib/check_updates.sh

@@ -0,0 +1,44 @@
+#!/bin/sh
+name=$1
+database=$2
+
+echo "Database Updater check script:"
+echo "  Checking database '${name}' for missing filenames in tables..."
+echo
+
+# Select all entries which are in the updates table
+entries=$(mysql -uroot ${database} -e "SELECT name FROM updates" | grep ".sql")
+
+cd sql/updates/${name}
+
+error=0
+updates=0
+
+for file in *.sql
+do
+ # Check if the given update is in the `updates` table.
+ if echo "${entries}" | grep -q "^${file}"; then
+  # File is ok
+  updates=$((updates+1))
+ else
+  # The update isn't listed in the updates table of the given database.
+  echo "- \"sql/updates/${file}\" is missing in table '${name}'.'updates'"
+  error=1
+ fi
+done
+
+if [ ${error} -ne 0 ]
+  then
+    echo
+    echo "Fatal error:"
+    echo "  The Database Updater is broken for database '${name}"
+    echo "  due to applied update which are missing in the '${name}'.'updates' table."
+    echo
+    echo "How to fix:"
+    echo "  Insert the missing names of sql updates which were applied already to"
+    echo "  the 'updates' table of the '${name}' base dump ('sql/base/${name}_database.sql')."
+    exit 1
+  else
+    echo "  Everything is ok, checked ${updates} updates."
+    exit 0
+fi