From 8e680d02382ccb616f9675bb0c263fc84a5eedd2 Mon Sep 17 00:00:00 2001
From: "Daniel F. Dickinson" <cshored@thecshore.com>
Date: Thu, 16 Jan 2020 10:27:43 -0500
Subject: [PATCH] Fix hostname leakage from build host

Many hosts (including the docker host) set HOSTNAME in the environment,
which means that unless the HOSTNAME is explicitly set in a 'config'
that the resulting image hostname will be the build host's hostname.

We fix that by unsetting HOSTNAME prior to reading the configs and
applying defaults.

Signed-off-by: Daniel F. Dickinson <cshored@thecshore.com>
---
 build.sh | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/build.sh b/build.sh
index 9e78728..ac20816 100755
--- a/build.sh
+++ b/build.sh
@@ -125,6 +125,10 @@ fi
 BASE_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 export BASE_DIR
 
+# Make sure HOSTNAME doesn't leak in from host
+unset HOSTNAME
+export HOSTNAME
+
 if [ -f config ]; then
 	# shellcheck disable=SC1091
 	source config