feat(postgres-backup-s3): Support custom backup filename (#160)

* Add support for back file name override

* apply to full dump too. include DB name

* readme updates

* consistency

postgres-backup-s3/Dockerfile

@@ -14,8 +14,8 @@ ENV POSTGRES_EXTRA_OPTS ''
 ENV S3_ACCESS_KEY_ID **None**
 ENV S3_SECRET_ACCESS_KEY **None**
 ENV S3_BUCKET **None**
+ENV S3_FILE_NAME **None**
 ENV S3_REGION us-west-1
-ENV S3_PATH 'backup'
 ENV S3_ENDPOINT **None**
 ENV S3_S3V4 no
 ENV SCHEDULE **None**

postgres-backup-s3/README.md

@@ -44,6 +44,11 @@ You can additionally set the `SCHEDULE` environment variable like `-e SCHEDULE="
 
 More information about the scheduling can be found [here](http://godoc.org/github.com/robfig/cron#hdr-Predefined_schedules).
 
+### Backup File Name / Path
+By default, if `POSTGRES_BACKUP_ALL` is true, the dump file will be put at `<S3_PREFIX=''>/all_<timestamp>.sql.gz`. When using `POSTGRES_DATABASE`, each database listed will be backed up to the object path `<S3_PREFIX=''>/<database>_<timestamp>.sql.gz`.
+
+If you wish to make these filenames static, you can use the `S3_FILE_NAME` variable, which will change these formats to `<S3_PREFIX=''>/<S3_FILE_NAME>.sql.gz` or `<S3_PREFIX=''>/<S3_FILE_NAME>_<database>.sql.gz` accordingly.
+
 ### Backup All Databases
 
 You can backup all available databases by setting `POSTGRES_BACKUP_ALL="true"`.

postgres-backup-s3/backup.sh

@@ -65,6 +65,10 @@ fi
 if [ "${POSTGRES_BACKUP_ALL}" == "true" ]; then
   SRC_FILE=dump.sql.gz
   DEST_FILE=all_$(date +"%Y-%m-%dT%H:%M:%SZ").sql.gz
+  
+  if [ "${S3_FILE_NAME}" != "**None**" ]; then
+    DEST_FILE=${S3_FILE_NAME}.sql.gz
+  fi
 
   echo "Creating dump of all databases from ${POSTGRES_HOST}..."
   pg_dumpall -h $POSTGRES_HOST -p $POSTGRES_PORT -U $POSTGRES_USER | gzip > $SRC_FILE
@@ -94,6 +98,10 @@ else
 
     SRC_FILE=dump.sql.gz
     DEST_FILE=${DB}_$(date +"%Y-%m-%dT%H:%M:%SZ").sql.gz
+
+    if [ "${S3_FILE_NAME}" != "**None**" ]; then
+      DEST_FILE=${S3_FILE_NAME}_${DB}.sql.gz
+    fi
     
     echo "Creating dump of ${DB} database from ${POSTGRES_HOST}..."
     pg_dump $POSTGRES_HOST_OPTS $DB | gzip > $SRC_FILE

postgres-backup-s3/install.sh

@@ -4,7 +4,8 @@
 set -eo pipefail
 
 apk update
-apk add postgresql-client openssl aws-cli
+apk add openssl aws-cli 
+apk add postgresql-client --repository=https://dl-cdn.alpinelinux.org/alpine/v3.18/main
 
 # cleanup
 rm -rf /var/cache/apk/*