Only backup databases that are less than 100MB to AFS

First order approximation, this skips databases that are smaller
than 100MB if they have large index files, but this prevents the
AFS backup volumes from becoming overful.

This version also fails to backup databases that have spaces in
their names, because of a bash for loop. Switching to \0 delimiters
will correct this issue.

Author: achernya

run-afs.sh

@@ -13,6 +13,9 @@
 # For this to work, we need to run k5start in "kinit daemon" mode,
 # which means we need a pid fie.
 
+base=/srv/data/mysql/db
+# Remember that du reports values in kb
+max_size=$((100 * 1024))
 kstartpid=$(mktemp /tmp/backup-ng-k5start.XXXXXXXXXX)
 kstartret=1
 
@@ -24,8 +27,12 @@ while [ $kstartret -ne 0 ]; do
 
 	# Get a list of all the mysql databases
 	for db in $(mysqlshow.py); do
+	    # Make sure the database is in the form username+db
 	    echo "$db" | grep -q '+'
 	    [ $? -ne 0 ] && continue
+	    # Figure out the size
+	    size=$(du -s /srv/data/mysql/db/$(mysqlname "$db") | awk '{print $1}')
+	    [ $size -gt $max_size ] && echo "Skipping $db" && continue
 	    user="${db%%+*}"
 	    sql-backup.py --local -c sql.mit.edu-afs.json --user="$user" --database="$db"
 	done