Ensure dependencies file exists and fail otherwise

Author: bjoernricks

.github/install-dependencies.sh

@@ -1,11 +1,16 @@
-#!/bin/sh
+#!/bin/bash
 # This script installs gvm-libs dependencies
 set -e
 
-BASEDIR=$(dirname $0)
+BASEDIR=$(dirname "$0")
 DEFAULT_DEPENDENCIES_FILE="$BASEDIR/build-dependencies.list"
 DEPENDENCIES_FILE=${1:-$DEFAULT_DEPENDENCIES_FILE}
 
+if [[ ! -f "$DEPENDENCIES_FILE" ]]; then
+    echo "Dependencies file not found: $DEPENDENCIES_FILE"
+    exit 1
+fi
+
 apt-get update && \
 apt-get install -y --no-install-recommends  --no-install-suggests \
-    $(cat $DEPENDENCIES_FILE | grep -v '#') \
+    $(grep -v '#' "$DEPENDENCIES_FILE")