-### updates the subversion column in plc_db_version by applying
-### all migrations scripts in /usr/share/plc_api/migrations/nnn-up-*
-### between the current_subversion+1 and the last one
-### migration indices must be contiguous
-function migrate_db () {
-
- ### check for (or create) the subversion column in plc_db_version
- psql -U $PLC_DB_USER -c 'select (subversion) from plc_db_version' $PLC_DB_NAME > /dev/null
- [ "$?" = 0 ] || psql -U $PLC_DB_USER -c 'ALTER TABLE plc_db_version ADD subversion integer DEFAULT 0' $PLC_DB_NAME
-
- # get current subversion - OUCH, THIS IS UGLY
- current_subversion=$(psql -U $PLC_DB_USER -c 'select (subversion) from plc_db_version' $PLC_DB_NAME | \
- grep '^ *[0-9][0-9]*$')
- current_subversion=$(($current_subversion))
- upgrade_index=$current_subversion
-
- while true; do
- upgrade_index=$(printf "%03d" $(($upgrade_index+1)))
- upgrade_scripts=$(ls -1 /usr/share/plc_api/migrations/${upgrade_index}-up-* 2> /dev/null)
- if [ -z "$upgrade_scripts" ] ; then
- echo "DB current migration is $current_subversion"
- psql -U $PLC_DB_USER -c "UPDATE plc_db_version SET subversion=$current_subversion" $PLC_DB_NAME
- break
- else
- for script in $upgrade_scripts; do
- # is this an sql script
- if [ $(basename "$script") != $(basename $script .sql) ] ; then
- echo "Applying SQL migration script $script"
- psql -U $PLC_DB_USER -f "$script" $PLC_DB_NAME
- elif [ -x "$script" ] ; then
- echo "Running executable migration script $script"
- "$script"
- else
- echo "WARNING - script $script ignored"
- fi
- done
- current_subversion=$(($upgrade_index))
+# Updates the database by applying all migration scripts in
+# /usr/share/plc_api/migrations/N-up-*, where N is greater than the
+# current subversion. At least one of the migration scripts with the
+# same N must update plc_db_version.subversion.
+function migrate_db()
+{
+ subversion=$(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