import pdb
import subprocess
import tempfile
import os.path
import shutil

def _onerror(func, path, exc_info):
    pdb.set_trace()
    subprocess.run(['hdiutil', 'unmount', device])
    shutil.rmtree(path)

pdb.set_trace()
imagefile = tempfile.mktemp(suffix='.dmg', dir=tempfile.gettempdir())
subprocess.run(['hdiutil', 'create', '-fs', 'MS-DOS', '-size', '180KB', imagefile])
device = ''
tmpdir = ''

try:
    with tempfile.TemporaryDirectory(onerror=_onerror) as d:
        print(d)
        tmpdir = str(d)
        foodir = os.path.join(d, 'foo')
        os.mkdir(foodir)
        ret = subprocess.run(['hdiutil', 'attach', '-mountroot', foodir, imagefile], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        device = ret.stdout.split()[2].decode('ascii')
except:
    pass

pdb.set_trace()
if os.path.exists(tmpdir):
    subprocess.run(['hdiutil', 'unmount', device])
    shutil.rmtree(tmpdir)
    os.unlink(imagefile)