Add script to purge backup iles

bin/ops/purge_backups.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+set -e
+
+
+echo "This script works only in dev amd production spaces as we take backups only in these spaces"
+echo "It relies on naming conventions used in br_nackup.sh"
+echo "It assumes that the S3 bucket named 'backups' has been bound"
+
+cfspace=$(cf target |tail -1|cut -d':' -f2|xargs)
+echo "Space: ${cfspace}"
+
+if [[ "$cfspace" != "dev" && "$cfspace" != "prodiction" ]]; then
+  echo "Error: Backups may only be purged fromr dev or production"
+  exit 1
+fi
+prefix=$(date '+%Y-%m-%d-%H%M')
+export PATH=/home/vcap/deps/0/apt/usr/lib/postgresql/15/bin:$PATH
+python manage.py fac_s3 backups --ls | awk '{print $1}' | grep "db\-backup" | sort -r > "$prefix"_backup_list.txt
+
+# retain 2 PR backups, 7 CRON backups and 2 non-std backups
+grep "\_PR\_" "$prefix"_backup_list.txt | tail +3 > "$prefix"_purge_list.txt
+grep "\_CRON\_" "$prefix"_backup_list.txt | tail +8 >> "$prefix"_purge_list.txt
+grep -v -e "\_PR\_" -e "\_CRON\_" "$prefix"_backup_list.txt | tail +3 >> "$prefix"_purge_list.txt
+
+echo "Purging backups ..."
+while read line; do
+  db_backup_name="$line"
+  echo "DB" "$db_backup_name" 
+  media_backup_name=$(echo "$line" | sed -e 's/-db-backup.psql.bin/-media-backup.tar/g')
+  echo "MEDIA" "$media_backup_name"
+  python manage.py fac_s3 backups --rm $db_backup_name
+  python manage.py fac_s3 backups --rm $media_backup_name
+done < "$prefix"_purge_list.txt
+
+rm "$prefix"_backup_list.txt "$prefix"_purge_list.txt