add cleanup-backups.sh

cleanup-backups.sh

@@ -0,0 +1,47 @@
+#!/bin/bash
+
+# format: db-dumps-YYYY-MM-DD.sql.gz
+BACKUPS="/home/backups/db-dump-*"
+
+DAILY_COUNT="14"
+WEEKLY_COUNT="8"
+MONTHLY_COUNT="12"
+
+# -----
+
+TODAY=$(date +%Y%m%d)
+TODAY_WEEKDAY=$(date +%w)
+
+
+TEMPFILE=$(mktemp)
+
+# create list
+for offset in `seq 0 $DAILY_COUNT`; do
+    tmp=$(date +%Y-%m-%d -d "-$offset days")
+    echo $tmp >> $TEMPFILE
+done
+
+for offset in `seq 0 $WEEKLY_COUNT`; do
+    calc=$[$offset * 7]
+    calc=$[$calc + $TODAY_WEEKDAY]
+
+    tmp=$(date +%Y-%m-%d -d "-$calc days")
+    echo $tmp >> $TEMPFILE
+done
+
+for offset in `seq 0 $MONTHLY_COUNT`; do
+    calc=$[$offset * 28]
+    calc=$[$calc + $TODAY_WEEKDAY]
+
+    tmp=$(date +%Y-%m-%d -d "-$calc days")
+    echo $tmp >> $TEMPFILE
+done
+
+# remove files not on the list
+ls -1 ${BACKUPS} | while read filename; do
+    filedate=$(echo $filename | awk -F'-' '{print $3-$4-$5}')
+
+    grep $filedate $TEMPFILE &> /dev/null || rm $filename
+done
+
+rm $TEMPFILE