Update

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

lib/runtime/merge/default.nix

@@ -4,8 +4,8 @@
     pkgs.writeShellApplication {
       name = "merge-key-value";
       runtimeInputs = with pkgs; [
-        gnugrep
         coreutils
+        gawk
       ];
       text = builtins.readFile ./key-value.sh;
     }

lib/runtime/merge/key-value.sh

@@ -1,19 +1,13 @@
 SOURCE_FILE=$(realpath -m "$1")
 TARGET_FILE=$(realpath -m "$2")
 
-mkdir -p "$(dirname "${TARGET_FILE}")"
-
-TEMP_FILE=$(mktemp)
-cat "${SOURCE_FILE}" > "${TEMP_FILE}"
-
 if [[ -f "${TARGET_FILE}" ]]; then
-  while IFS='=' read -r key value; do
-    if ! grep -q "^${key}=" "${TEMP_FILE}"; then
-      echo "${key}=${value}" >> "${TEMP_FILE}"
-    fi
-  done < "${TARGET_FILE}"
+  TEMP_FILE=$(mktemp)
+  awk -F '=' 'NR==FNR{a[$1]=$0;next}($1 in a){$0=a[$1]}1' "${SOURCE_FILE}" "${TARGET_FILE}" > "${TEMP_FILE}"
+  mv "${TEMP_FILE}" "${TARGET_FILE}"
+else
+  mkdir -p "$(dirname "${TARGET_FILE}")"
+  cp "${SOURCE_FILE}" "${TARGET_FILE}"
 fi
 
-mv "${TEMP_FILE}" "${TARGET_FILE}"
-
 echo "Configuration file ${TARGET_FILE} has been updated."