refactor: many changes

scripts/test-configuration

@@ -0,0 +1,60 @@
+#!/usr/bin/env bash
+set -Euo pipefail
+
+VERBOSE=false
+SHOW_TRACE_OPT=""
+
+# Parse options
+#
+if [ "$#" -gt 0 ]; then
+  if [[ "$1" == "-v" || "$1" == "--verbose" ]]; then
+    VERBOSE=true
+    SHOW_TRACE_OPT="--show-trace"
+    shift # Remove the verbose flag from arguments
+  fi
+fi
+
+# Check if 'nixos-rebuild' command is available
+if ! command -v nixos-rebuild > /dev/null; then
+  echo "ERROR: 'nixos-rebuild' command not found. Please ensure it is installed and in your PATH." >&2
+  exit 1
+fi
+
+# Determine the absolute directory where the script itself is located
+SCRIPT_DIR=$(dirname "$(readlink -f "$0")")
+
+# Construct the absolute path to the configuration file
+# and resolve it to a canonical path
+CONFIG_PATH=$(readlink -f "$SCRIPT_DIR/../example/configuration.nix")
+CHANNEL=$(cat "$SCRIPT_DIR/../example/channel")
+
+# Verify that the CONFIG_PATH exists and is a regular file
+if [ ! -f "$CONFIG_PATH" ]; then
+  echo "ERROR: Configuration file not found at '$CONFIG_PATH'." >&2
+  exit 1
+fi
+
+echo "INFO: Attempting dry-build for using configuration '$CONFIG_PATH'..."
+if [ "$VERBOSE" = true ]; then
+  echo "INFO: Verbose mode enabled, --show-trace will be used."
+fi
+
+# Execute nixos-rebuild dry-build
+# Store the output and error streams, and the exit code
+NIX_OUTPUT_ERR=$(nixos-rebuild dry-build $SHOW_TRACE_OPT -I nixpkgs=$CHANNEL/nixexprs.tar.xz -I nixos-config="$CONFIG_PATH" 2>&1)
+NIX_EXIT_STATUS=$?
+
+# Check the exit status
+if [ "$NIX_EXIT_STATUS" -eq 0 ]; then
+  echo "INFO: Dry-build for completed successfully."
+  if [ "$VERBOSE" = true ]; then
+    echo "Output from nixos-rebuild:"
+    echo "$NIX_OUTPUT_ERR"
+  fi
+  exit 0
+else
+  echo "ERROR: Dry-build for failed. 'nixos-rebuild' exited with status $NIX_EXIT_STATUS." >&2
+  echo "Output from nixos-rebuild:" >&2
+  echo "$NIX_OUTPUT_ERR" >&2
+  exit "$NIX_EXIT_STATUS"
+fi