Meta: Ensure that icons and other resources remain non-executable

Author: https://github.com/BenWiederhake
Commit: https://github.com/SerenityOS/serenity/commit/8aa6b13caae
Pull-request: https://github.com/SerenityOS/serenity/pull/2914

.travis.yml

@@ -35,6 +35,7 @@ before_install:
 script:
 - export SERENITY_ROOT=$(pwd)
 - Meta/lint-shell-scripts.sh
+- Meta/lint-executable-resources.sh
 - Meta/check-style.sh
 - cd Toolchain
 - TRY_USE_LOCAL_TOOLCHAIN=y ./BuildIt.sh

Meta/lint-executable-resources.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+set -e pipefail
+
+script_path=$(cd -P -- "$(dirname -- "$0")" && pwd -P)
+cd "$script_path/.."
+
+BAD_FILES=$(find Base/etc/ Base/res/ Base/www/ -type f -executable)
+
+if [ -n "${BAD_FILES}" ]
+then
+    echo "These files are marked as executable, but are in directories that do not commonly"
+    echo "contain executables. Please double-check the permissions of these files:"
+    echo "${BAD_FILES}" | xargs ls -ld
+    exit 1
+fi