+# Updates the database by applying all migration scripts in
+# /usr/share/plc_api/migrations/N-up-*, where N is greater than the
+# current subversion. At least one of the migration scripts with the
+# same N must update plc_db_version.subversion.
+function migrate_db()
+{
+ subversion=$(psql -U $PLC_DB_USER --quiet --tuples-only --no-align -c \
+ "SELECT subversion FROM plc_db_version LIMIT 1" \
+ $PLC_DB_NAME 2>/dev/null || echo 0)
+ shopt -s nullglob
+ for file in /usr/share/plc_api/migrations/[0-9]*-up-* ; do
+ script=$(basename $file)
+ index=${script%-up*}
+ extension=${script##*.}
+ if [ $index -gt $subversion ] ; then
+ if [ "$extension" = "sql" ] ; then
+ psql -U $PLC_DB_USER -f $file $PLC_DB_NAME
+ elif [ -x $file ] ; then
+ $file
+ fi
+ check