mariadb: Style fixes and store 30 days of backups

roles/mariadb/files/mariadb-backup.sh

@@ -4,23 +4,16 @@ set -eu
 
 umask 027
 
-DESTDIR="/export/backup"
+DESTDIR="/srv/backup"
 DATE="$(date +%Y-%m-%d)"
 
-if [ ! -d "$DESTDIR" ]; then
-    echo "ERR: MariaDB backup directory [${DESTDIR}] does not exist" 1>&2
-    exit 1
-fi
+cd "$DESTDIR"
+find . -xdev -mindepth 2 -maxdepth 2 -type f -mtime +30 \
+    -execdir rm -f -- {} \;
+find . -xdev -depth -mindepth 1 -maxdepth 1 -type d -empty \
+    -execdir rmdir -- {} \;
 
-cd "$DESTDIR" && {
-    find . -xdev -mindepth 2 -maxdepth 2 -type f -mtime +7 \
-        -execdir rm -f -- {} \;
-    find . -xdev -depth -mindepth 1 -maxdepth 1 -type d -empty \
-        -execdir rmdir -- {} \;
-}
-
-DESTDIR="${DESTDIR}/${DATE}"
-mkdir "$DESTDIR"
+mkdir "$DATE"
 
 for db in $(mysql -e "show databases" -s) ; do
     case "$db" in
@@ -28,5 +21,5 @@ for db in $(mysql -e "show databases" -s) ; do
             continue
             ;;
     esac
-    mysqldump -E --add-drop-table "$db" | gzip > "${DESTDIR}/${db}.${DATE}.gz"
+    mysqldump -E --add-drop-table "$db" | gzip > "${DATE}/${db}.${DATE}.gz"
 done