Hook I am using on uutils/coreutils. Just place as .git/hooks/pre-commit and make it executable.

coreutils_hook.sh

#!/bin/sh

CARGO_VER=1.40.0

STAGED=$(git diff --name-only --cached | grep '.*\.rs')

PREV_DEFAULT_VERSION=$(rustup show | grep default | head -n1 | sed 's/(default)//')

rustup default $CARGO_VER-x86_64-unknown-linux-gnu

function abort() {
	rustup default $PREV_DEFAULT_VERSION; exit 1
}

cargo check || {
	echo -e "\e[31m\nCargo check failed\e[0m" ; abort
}

if ! [ "$STAGED" = '' ]; then
	rustfmt --check $STAGED || {
		 echo -e "\e[31m\nPlease run rusftmt on all staged files before committing\e[0m" ; abort
	}
fi

echo -e "Running \e[34mcargo +$CARGO_VER update\e[0m ..."
cargo +$CARGO_VER update || {
	echo -e "\e[31mFailed to run cargo update (do you have the $CARGO_VER toolchain installed?)\e[0m" ; abort
}

rustup default $PREV_DEFAULT_VERSION