#!/usr/bin/env bash
#
# To install the hook copy this file to `.git/hooks/post-checkout` or run
# scripts/setup-rust install_hook

set -u

# Set to "android", "desktop", or "ios".
MULLVAD_SETUP_PLATFORM="${MULLVAD_SETUP_PLATFORM:-}"

SETUP_RUST_SCRIPT="scripts/setup-rust"

if [[ ! -f "$SETUP_RUST_SCRIPT" ]]; then
    exit 0
fi

if [[ -z ${MULLVAD_SETUP_PLATFORM+x} ]]; then
    echo "MULLVAD_SETUP_PLATFORM is not set, must be set to " >&2
    echo "\`android\`, \`desktop\` or \`ios\`" >&2
    exit 1
fi

git diff-tree --exit-code "$1".."$2" --quiet -- rust-toolchain.toml

# Exit code 1 means there was a change, 0 means no change.
if [[ $? -eq 1 ]]; then
    $SETUP_RUST_SCRIPT "$MULLVAD_SETUP_PLATFORM"
fi