# dns = ["1.1.1.1"] # optional; nameservers to inject into containers
/etc is also writable, but it’s managed a bit differently. OSTree uses a technique called “etc overlay” to handle modifications in /etc. When an update is applied, OSTree compares files in the new version with those in /etc and applies changes intelligently, preserving local modifications as much as possible.
，这一点在91视频中也有详细论述
make Instagram be what my parents said Facebook was.
identity function for slices that are already allocated in the heap.