Prevent root from running the enter.sh helper script (#4216)

* Prevent root from running the enter.sh helper script

Since configure doesn't like being ran as root, check in the enter.sh script
that the user running it is not UID/GID 0. The script itself takes care of
running what needs to be executed privileged with explicit sudo commands.

Fixes #4214

* Reword the error message


Co-authored-by: Stefan Agner <[email protected]>

Author: sairon

scripts/enter.sh

@@ -7,6 +7,11 @@ CACHE_DIR="${CACHE_DIR:-$HOME/hassos-cache}"
 ARGS="$*"
 COMMAND="${ARGS:-bash}"
 
+if [ "$BUILDER_UID" -eq "0" ] || [ "$BUILDER_GID" == "0" ]; then
+  echo "ERROR: Please run this script as a regular (non-root) user with sudo privileges."
+  exit 1
+fi
+
 sudo mkdir -p "${CACHE_DIR}"
 sudo chown -R "${BUILDER_UID}:${BUILDER_GID}" "${CACHE_DIR}"
 sudo docker build -t hassos:local .