⚠️ After further testing it appears this technique is quite unreliable (e.g. it does not work with some earlier Docker versions). Use at your own risk.

Detect if code is running inside a chroot environment.

Retrieve inode for / if it is not 2 assume code runs inside chroot.

use inside_chroot::inside_chroot;
let inside = inside_chroot().unwrap();
assert!(!inside) // may fail if tests are run inside a chroot env

cargo run --example inside-root

currently not inside chroot

# compiles inside-chroot example binary
cargo build --example inside-chroot
# start a docker container
docker run -it -v ${PWD}/target/debug/examples/:/examples archlinux:latest /examples/inside-chroot 
currently inside chroot 

• https://stackoverflow.com/questions/75182/detecting-a-chroot-jail-from-within
• https://unix.stackexchange.com/questions/14345/how-do-i-tell-im-running-in-a-chroot

Dual-licensed under MIT or the Apache License V2.0.