esphome/script/git-hooks/post-checkout

#!/bin/sh
# Prepare the dev environment for a new checkout or worktree.
#
# Installed into the git hooks directory by script/setup. Deliberately tiny and
# self-contained: it stays valid on branches where script/setup does not exist,
# and simply does nothing there.

# $3 is 1 for a branch checkout, 0 for a file checkout.
[ "$3" = "1" ] || exit 0

top=$(git rev-parse --show-toplevel 2>/dev/null) || exit 0

# This also runs on ordinary branch switches, where there is nothing to do.
[ -x "$top/venv/bin/python" ] && exit 0
[ -x "$top/script/setup" ] || exit 0

# Clear VIRTUAL_ENV so a checkout made from a shell with an environment already
# activated still gets its own, rather than having the active one repointed at
# this working tree.
exec env -u VIRTUAL_ENV "$top/script/setup"