Make your Bash shell VRF aware

_etc_bash.bashrc.sh

# System-wide .bashrc file for interactive bash(1) shells.

# To enable the settings / commands in this file for login shells as well,
# this file has to be sourced in /etc/profile.

# --------- CUT HERE ---------
# Default to management VRF if available
[ -z "${VRF}" ] && sudo -n change-vrf "mgmt" "$$" 2>/dev/null && export VRF="mgmt"
# --------- CUT HERE ---------

# If not running interactively, don't do anything
# [.. all the way to the end ..]

# --------- CUT HERE ---------
function _refresh_vrf {
	VRF="$(ip vrf identify $$)"
	debian_chroot="vrf:${VRF:-default}"
}
function vrf {
	sudo change-vrf "${1?:Which VRF?}" "$$"
	_refresh_vrf
}
_refresh_vrf
# --------- CUT HERE ---------

change-vrf.sh

#!/usr/bin/env bash
# Usage: switch-vrf <VRF> <PID>
# Requires root (or a bunch of CAPs)

set -euo pipefail

VRF="${1:?Missing VRF name}"
PID="${2:?Missing PID}"

CGROUP="$(ip vrf exec "${VRF}" awk -F : '/^0/ {print $3}' /proc/self/cgroup)"
MNT="$(findmnt -nft cgroup2 -o target)"

echo "${PID}" >> "${MNT}/${CGROUP}/cgroup.procs"