From abe0d451abe30af451a4e66366b18875ec23347b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?M=C4=83rcziem=20=E2=84=A2?=
 <118485377+spalencsar@users.noreply.github.com>
Date: Fri, 3 Oct 2025 12:20:44 +0200
Subject: [PATCH] fix(docker): default DOCKER_DATA_DIR to
 DEFAULT_DOCKER_DATA_DIR to avoid unbound variable

---
 lib/docker.sh | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/docker.sh b/lib/docker.sh
index 2aa522d..4c92763 100644
--- a/lib/docker.sh
+++ b/lib/docker.sh
@@ -6,6 +6,11 @@
 # `set -u`.
 SUDO=${SUDO:-sudo}
 
+# Ensure DOCKER_DATA_DIR has a sensible default to avoid unbound variable
+# errors when running under `set -u` and when no custom value is provided
+# by the configuration file. Use DEFAULT_DOCKER_DATA_DIR from defaults.sh.
+DOCKER_DATA_DIR=${DOCKER_DATA_DIR:-${DEFAULT_DOCKER_DATA_DIR:-/var/lib/docker}}
+
 install_docker() {
     log_info "Installing Docker..."