add backup script to create restorable dump

contribution/bash/backup_database.sh

@@ -0,0 +1,34 @@
+#!/bin/sh
+
+if [ -z "$2" ] ; then
+	echo "Usage:\n\n\t$0 <database name> <targetfile>\n\n" >&2
+	exit 1
+fi
+
+dump=`which pg_dump`
+
+if [ ! -x  "$dump" ] ; then
+	echo "No pg_dump binary found in path!" >&2
+	exit 2
+fi
+
+dbname="$1"
+targetfile="$2"
+
+
+# dump the schema first
+
+$dump --create --clean --if-exists --schema-only "$dbname" > "$targetfile"
+
+# dump data of tables in correct order, i.e. the order that is necessary for successful
+# restore due to dependencies
+
+for table in tbl_ticket_state tbl_handle tbl_user tbl_worker_group tbl_worker tbl_encoding_profile \
+	tbl_encoding_profile_version tbl_encoding_profile_property tbl_project tbl_project_language \
+	tbl_project_property tbl_project_ticket_state tbl_project_worker_group \
+	tbl_project_worker_group_filter tbl_project_encoding_profile tbl_user_project_restrictions \
+	tbl_import tbl_ticket tbl_ticket_property tbl_comment tbl_log ; do
+
+	$dump --data-only --disable-triggers --table=$table "$dbname" >> "$targetfile"
+done
+