ds64-runner

#!/bin/bash
# Run the specified application, with any arguments, in the
# 64-bit Debian container, using the host OS' X-server and pulseaudio
# server. Also include a QT fixup for apps like vlc that need it.
# Prompt (via zenity) for which apps to run, and, if a non-absolute
# path is given, handle this appropriately.
#
# Alternatively, if argument(s) passed, use those instead.
#
# Copyright (c) 2019-20 sakaki <sakaki@deciban.com>
# License: GPL 3.0+
# NO WARRANTY

DS64_CONF="/etc/ds64.conf"
[[ -s "${DS64_CONF}" ]] && source "${DS64_CONF}"
DS64_NAME="${DS64_NAME:-debian-buster-64}"
DS64_DIR="${DS64_DIR:-/var/lib/machines/${DS64_NAME}}"
HAS_ZENITY=0
which zenity &>/dev/null && [[ ${DISPLAY:-} ]] && HAS_ZENITY=1

check-aarch64 || exit 1

if ! ds64-running; then
    if ((HAS_ZENITY==1)); then
	zenity --error --no-wrap \
	       --title="Error starting 64-bit program" \
	       --text="The ${DS64_NAME} container is not running!\nPlease start it and try again." \
	       --timeout=5
    else
	>&2 echo -e "Error starting 64-bit program: the ${DS64_NAME} container is not running!\nPlease start it and try again."
    fi
    exit 1
fi
# have we already been given the program to run via
# the command line?
if (($#==0)); then
    # no, must ask the user if we can do so elegantly, error out otherwise
    if ((HAS_ZENITY==1)); then
	if ! P=$(zenity --entry --title="Run 64-bit program" \
			--width=400 \
			--text="Please enter the 64-bit program to run\n(parameters allowed):"); then
		exit 1
	fi
	# force it through a "which" lookup, this will work for full paths
	# and names; parse into array to allow arguments
	read -ra PA <<< "${P}"
    else
	>&2 echo "Error: you must pass a command to execute (parameters allowed)."
	exit 1
    fi
else
	# yes, just slurp it
	PA=("${@}")
fi
# if nothing passed, do nothing
if ((${#PA[@]}==0)); then
	exit 1
fi
# consruct a string for container-side path lookup
# passing remaining components through as arguments
C="eval \$\(which ${PA[0]}\) ${PA[@]:1}"
# make sure not to exit with a failure, or the starting service
# will also fail, and the machine state will transit to
# degraded
ds64-run /bin/bash -c "${C} || zenity --error --no-wrap --timeout=5 "\
"--title='Error starting program' "\
"--text='The program you specified either could not be started,\n"\
"or exited with an error!\n"\
"Is it installed in the ${DS64_NAME} container?' || true"