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#!/usr/bin/env python3
# This file is part of Firejail project
# Copyright (C) 2014-2026 Firejail Authors
# License GPL v2
import re
import sys
import subprocess
usage = """fjdisplay.py name-of-firejail
returns the display in the form of ':NNN'
"""
def getfirejails():
output = subprocess.check_output(['firemon', '--x11'])
firejails = {}
name = ''
for line in output.split('\n'):
namematch = re.search('--name=(\w+\S*)', line)
if namematch:
name = namematch.group(1)
displaymatch = re.search('DISPLAY (:\d+)', line)
if displaymatch:
firejails[name] = displaymatch.group(1)
return firejails
def getdisplay(name):
firejails = getfirejails()
fjlist = '\n'.join(firejails.keys())
namere = re.compile('^' + name + '.*', re.MULTILINE)
matchingjails = namere.findall(fjlist)
if len(matchingjails) == 1:
return firejails[matchingjails[0]]
if len(matchingjails) == 0:
raise NameError("firejail {} does not exist".format(name))
else:
raise NameError("ambiguous firejail name")
if __name__ == '__main__':
if '-h' in sys.argv or '--help' in sys.argv or len(sys.argv) > 2:
print(usage)
exit()
if len(sys.argv) == 1:
print(getfirejails())
if len(sys.argv) == 2:
print(getdisplay(sys.argv[1]))
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