Add script to verify NIC files match the sources

integrity_check.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+set -e
+
+WORKSPACE_DIR=$(mktemp -d -t templates)
+TEMPLATES_DIR=$(pwd)
+
+# For each directory containing a valid NIC templates' source
+TEMPLATES_SOURCES=$(find "${TEMPLATES_DIR}" -type d -name NIC -exec dirname {} \;)
+
+cd "${WORKSPACE_DIR}"
+
+EXIT_CODE=0
+
+for TEMPLATES_SOURCE in $TEMPLATES_SOURCES; do
+    "${THEOS}/bin/nicify.pl" "${TEMPLATES_SOURCE}" 2> /dev/null
+    RESULT_FILE=$(ls *.nic.tar)
+    EXTRACT_DIR=$(mktemp -d -t "${RESULT_FILE}" -p .)
+    tar -xf "${TEMPLATES_DIR}/${RESULT_FILE}" -C "${EXTRACT_DIR}"
+    # thanks to https://stackoverflow.com/a/49633090
+    if ! diff -r --no-dereference --brief -x '.keep' "${TEMPLATES_SOURCE}" "${EXTRACT_DIR}"; then
+        EXIT_CODE=1
+        # per https://docs.github.com/en/actions/learn-github-actions/variables#default-environment-variables
+        if [[ "${GITHUB_ACTIONS}" = "true" ]]; then
+            # per https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#setting-an-error-message
+            echo "::error file=${RESULT_FILE},title=Mismatch::The NIC file does not match the template directory"
+        fi
+    fi
+    rm "${RESULT_FILE}"
+done
+
+exit "${EXIT_CODE}"