Merge pull request #14 from fulminant/master

Added BACKUP_KEEP_DAYS option.

.gitignore

@@ -0,0 +1 @@
+.idea

Dockerfile

@@ -19,6 +19,7 @@ ENV S3_ENDPOINT ''
 ENV S3_S3V4 'no'
 ENV SCHEDULE ''
 ENV PASSPHRASE ''
+ENV BACKUP_KEEP_DAYS ''
 
 ADD src/run.sh run.sh
 ADD src/backup.sh backup.sh

README.md

@@ -24,11 +24,14 @@ pg_backup_s3:
     POSTGRES_DATABASE: dbname
     POSTGRES_USER: user
     POSTGRES_PASSWORD: password
+    BACKUP_KEEP_DAYS: 7 // Disabled by default.
 ```
+
 - Images are tagged by the major PostgreSQL version they support: `10`, `11`, `12`, `13`, or `14`.
 - The `SCHEDULE` variable determines backup frequency. See go-cron schedules documentation [here](http://godoc.org/github.com/robfig/cron#hdr-Predefined_schedules). Omit to run the backup immediately and then exit.
 - If `PASSPHRASE` is provided, the backup will be encrypted using GPG.
 - Run `docker exec <container name> sh backup.sh` to trigger a backup ad-hoc
+- Use `BACKUP_KEEP_DAYS` to set time for how long you want to keep backup.
 
 ## Restore
 > **WARNING:** DATA LOSS! All database objects will be dropped and re-created.
@@ -52,6 +55,7 @@ This project is a fork and re-structuring of @schickling's [postgres-backup-s3](
   - [x] backup and restore with one image
   - [x] support encrypted (password-protected) backups
   - [x] option to restore from specific backup by timestamp
+  - [x] auto-removal old backups
 
 ## Other changes
   - uses `pg_dump`'s `custom` format (see [docs](https://www.postgresql.org/docs/10/app-pgdump.html))

src/backup.sh

@@ -83,3 +83,18 @@ aws $aws_args s3 cp "$local_file" "$s3_uri"
 rm "$local_file"
 
 echo "Backup complete."
+
+if [ -n "$BACKUP_KEEP_DAYS" ]; then
+  sec=$((86400*BACKUP_KEEP_DAYS))
+  date_from_remove=$(date -d "@$(($(date +%s) - sec))" +%Y-%m-%d)
+  backups_query="Contents[?LastModified<='${date_from_remove} 00:00:00'].{Key: Key}"
+
+  echo "Removing old backup from $S3_BUCKET..."
+  aws s3api list-objects \
+    --bucket "${S3_BUCKET}" \
+    --prefix "${S3_PREFIX}" \
+    --query "${backups_query}" \
+    --output text \
+    | xargs -n1 -t -I 'KEY' aws s3 rm s3://"${S3_BUCKET}"/'KEY'
+  echo "Removing complete."
+fi