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#!/usr/bin/python3
import json
import subprocess
import sys
"""
This little script is used by the xendomains init script. It gets a filename of
a domU guest config file as argument and uses xen create --dryrun to parse the
config file and extract the domU name from it.
Note that there is no proper error handling. So, if a user symlinks something
else than a correctly formatted domU config file into /etc/xen/auto (or a
different path configured to use, of course) then this will just do ugly things
and explode.
"""
cmd = ('xen', 'create', '--quiet', '--dryrun', '--defconfig', sys.argv[1])
domU_json = subprocess.check_output(cmd)
name = json.loads(domU_json)['c_info']['name']
print(name)
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