···11+#!/usr/bin/env nix
22+#! nix shell nixpkgs#bash nixpkgs#curl nixpkgs#nix nixpkgs#coreutils --command bash
33+set -xeuo pipefail
44+55+# Since flakes are not stable yet, we can't suppose everyone is using them.
66+# Therefore, the original ./update-from-overlay should not be modified.
77+# So, let's create a wrapper!
88+99+source ./update-from-overlay