ccache: make src reproducible

pkgs/by-name/cc/ccache/package.nix

@@ -26,7 +26,20 @@ stdenv.mkDerivation (finalAttrs: {
     owner = "ccache";
     repo = "ccache";
     rev = "refs/tags/v${finalAttrs.version}";
-    sha256 = "sha256-0T9iJXnDX8LffhB/5hsfBNyZQ211f0lL/7dvTrjmiE0=";
+    # `git archive` replaces `$Format:%H %D$` in cmake/CcacheVersion.cmake
+    # we need to replace it with something reproducible
+    # see https://github.com/NixOS/nixpkgs/pull/316524
+    postFetch = ''
+      sed -i -E \
+        's/version_info "([0-9a-f]{40}) .*(tag: v[^,]+).*"/version_info "\1 \2"/g w match' \
+        $out/cmake/CcacheVersion.cmake
+      if [ -s match ]; then
+        rm match
+      else # pattern didn't match
+        exit 1
+      fi
+    '';
+    hash = "sha256-YHSr2pnk17QEdrIHInXX2eBFN9OGjdleaB41VLaqlnA=";
   };
 
   outputs = [