Add compression level selection

Author: staser

README.md

@@ -26,6 +26,7 @@ PG_URI=postgres://mongo-host:5432/db-name
 GPG_KEYSERVER=keyserver.ubuntu.com # your hpks keyserver
 GPG_KEYID=<key_id> # recipient key, backup will be encrypted if added
 COMPRESS=pigz # Available: pigz, xz, bzip2, lrzip, brotli, zstd
+COMPRESS_LEVEL=7 # Compression level of desired compression program
 ```
 
 Or see `docker-compose.yml` file to run this container with Docker.

entrypoint.sh

@@ -11,6 +11,7 @@ get_date () {
 : ${GPG_KEYSERVER:='keyserver.ubuntu.com'}
 : ${GPG_KEYID:=''}
 : ${COMPRESS:='pigz'}
+: ${COMPRESS_LEVEL:='9'}
 : ${MAINTENANCE_DB:='postgres'}
 START_DATE=`date +%Y-%m-%d_%H-%M-%S`
 
@@ -30,27 +31,27 @@ mc mb backup/${S3_BUCK} --insecure || true
 
 case $COMPRESS in
   'pigz' )
-      COMPRESS_CMD='pigz -9'
+      COMPRESS_CMD='pigz -'${COMPRESS_LEVEL}
       COMPRESS_POSTFIX='.gz'
     ;;
   'xz' )
-      COMPRESS_CMD='xz'
+      COMPRESS_CMD='xz -'${COMPRESS_LEVEL}
       COMPRESS_POSTFIX='.xz'
     ;;
   'bzip2' )
-      COMPRESS_CMD='bzip2 -9'
+      COMPRESS_CMD='bzip2 -'${COMPRESS_LEVEL}
       COMPRESS_POSTFIX='.bz2'
     ;;
   'lrzip' )
       COMPRESS_CMD='lrzip -l -L5'
       COMPRESS_POSTFIX='.lrz'
     ;;
   'brotli' )
-      COMPRESS_CMD='brotli -9'
+      COMPRESS_CMD='brotli -'${COMPRESS_LEVEL}
       COMPRESS_POSTFIX='.br'
     ;;
   'zstd' )
-      COMPRESS_CMD='zstd -9'
+      COMPRESS_CMD='zstd -'${COMPRESS_LEVEL}
       COMPRESS_POSTFIX='.zst'
     ;;
   * )