From 85e34c73a3e02057319580eeed448967e5f9c442 Mon Sep 17 00:00:00 2001
From: Asif Bacchus <asif@bacchus.cloud>
Date: Tue, 9 Feb 2021 08:22:48 -0700
Subject: [PATCH] feature(BACKUP): add compression option

- parameter to specify compression used by borg
- as requested by shaneonabike (via github)

Closes github 5
---
 backup/backup.sh | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/backup/backup.sh b/backup/backup.sh
index 9d516f8..64a10f3 100755
--- a/backup/backup.sh
+++ b/backup/backup.sh
@@ -164,6 +164,10 @@ scriptHelp() {
     textblock "Path to write log file"
     defaultsTextblock "(scriptPath/scriptName.log)"
     newline
+    switchTextblock "--compression"
+    textblock "Compression algorithm(s) that borg should use. Please run 'borg help compression' for details."
+    defaultsTextblock "(not specified, use borg default of lz4)"
+    newline
     switchTextblock "[SWITCH] -v | --verbose"
     textblock "Log borg output with increased verbosity (list all files). Careful! Your log file can get very large very quickly!"
     defaultsTextblock "(normal output, option is OFF)"
@@ -300,6 +304,15 @@ while [ $# -gt 0 ]; do
                 badParam empty "$@"
             fi
             ;;
+        --compression)
+            # set borg archive compression
+            if [ -n "$2" ]; then
+                borgCompression="$2"
+                shift
+            else
+                badParam empty "$@"
+            fi
+            ;;
         -v|--verbose)
             # set verbose logging from borg
             borgCreateParams='--list --stats'
@@ -419,7 +432,10 @@ fi
 if [ ! -f "$mcDockerCompose" ]; then
     badParam dne "(--docker-compose)" "$mcDockerCompose"
 fi
-
+# set compression level if specified
+if [ -n "$borgCompression" ]; then
+    borgCreateParams="${borgCreateParams} --compression ${borgCompression}"
+fi
 
 ### read mailcow.conf and set vars as needed
 # shellcheck source=./mailcow.conf.shellcheck