From a3d040fbe97ffdc7ace72bc61e7a74212ef6c017 Mon Sep 17 00:00:00 2001
From: Kevin Veen-Birkenbach <kevin@veen.world>
Date: Thu, 24 Dec 2020 15:15:01 +0100
Subject: [PATCH] hashed machine-id for security reasons

---
 docker-volume-backup.sh | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/docker-volume-backup.sh b/docker-volume-backup.sh
index 6c7157b..c2727c7 100644
--- a/docker-volume-backup.sh
+++ b/docker-volume-backup.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
+# @todo rethink optional parameter
 # @param $1 [optional] : The path for the backups folder. DEFAULT $HOME/Backups/
+# @see https://www.freedesktop.org/software/systemd/man/machine-id.html
 
 backup_time="$(date '+%Y%m%d%H%M%S')"
 docker_backups_mount="$(test -z "$1" && echo "/Backups/" || echo "/$(basename "$1")/")"
@@ -10,7 +12,7 @@ do
   echo "stop container: $docker_container_name" && docker stop "$docker_container_name"
   for source_path in $(docker inspect --format '{{ range .Mounts }}{{ if eq .Type "volume" }}{{ println .Destination }}{{ end }}{{ end }}' "$docker_container_name");
   do
-    application_path="$docker_backups_mount$(cat /etc/machine-id)/docker/$docker_container_name/";
+    application_path="$docker_backups_mount$(sha256sum /etc/machine-id | head -c 64)/docker/$docker_container_name/";
     destination_path="$application_path""latest""$source_path";
     log_path="$application_path""log.txt";
     backup_dir_path="$application_path""diffs/$backup_time$source_path";