armbian-build/lib/functions/host/host-utils.sh

#!/usr/bin/env bash
# wait_for_package_manager
#
# * installation will break if we try to install when package manager is running
#
wait_for_package_manager() {
	# exit if package manager is running in the back
	while true; do
		if [[ "$(
			fuser /var/lib/dpkg/lock 2> /dev/null
			echo $?
		)" != 1 && "$(
			fuser /var/lib/dpkg/lock-frontend 2> /dev/null
			echo $?
		)" != 1 ]]; then
			display_alert "Package manager is running in the background." "Please wait! Retrying in 30 sec" "wrn"
			sleep 30
		else
			break
		fi
	done
}