Automatic pg_basebackup and wal_archive cleaning

optional/postgresql/basebackup.sh

@@ -0,0 +1,30 @@
+#!/bin/sh
+
+dest="/backup/base-$(date +%F-%H%M)"
+last=$(ls -d /backup/base* | tail -n1)
+mkdir $dest || exit $?
+
+pg_basebackup --pgdata=$dest --format=tar --gzip --username=postgres || exit $?
+
+# Clean old base backups, keep the last and the current.
+for d in /backup/base*; do
+    if [ "$d" == "$last" ] || [ "$d" == "$dest" ]; then
+        continue
+    fi
+    rm -r $d || exit $?
+done
+
+# Clean the wall archive
+cd /backup/wal_archive || exit $?
+if [ $(ls *.*.backup | wc -l) -lt 2 ]; then
+    ls /backup/wal_archive
+    exit 0
+fi
+# Find the single last wal.backup point
+prev_wal_start="$(ls *.*.backup | tail -n2 | head -n1)"
+for f in $(ls) ; do
+    if [ "$f" \< "$prev_wal_start" ] || [ "$f" \= "$prev_wal_start" ]; then
+        rm -v /backup/wal_archive/$f
+    fi
+done
+ls /backup/wal_archive