services/fuse/tests/mount_test_base.py

   1 import arvados
   2 import arvados.safeapi
   3 import arvados_fuse as fuse
   4 import llfuse
   5 import os
   6 import shutil
   7 import subprocess
   8 import sys
   9 import tempfile
  10 import threading
  11 import time
  12 import unittest
  13 import logging
  14 import multiprocessing
  15 import run_test_server
  16
  17 logger = logging.getLogger('arvados.arv-mount')
  18
  19 class MountTestBase(unittest.TestCase):
  20     def setUp(self, api=None, local_store=True):
  21         # The underlying C implementation of open() makes a fstat() syscall
  22         # with the GIL still held.  When the GETATTR message comes back to
  23         # llfuse (which in these tests is in the same interpreter process) it
  24         # can't acquire the GIL, so it can't service the fstat() call, so it
  25         # deadlocks.  The workaround is to run some of our test code in a
  26         # separate process.  Forturnately the multiprocessing module makes this
  27         # relatively easy.
  28         self.pool = multiprocessing.Pool(1)
  29
  30         if local_store:
  31             self.keeptmp = tempfile.mkdtemp()
  32             os.environ['KEEP_LOCAL_STORE'] = self.keeptmp
  33         else:
  34             self.keeptmp = None
  35         self.mounttmp = tempfile.mkdtemp()
  36         run_test_server.run()
  37         run_test_server.authorize_with("admin")
  38         self.api = api if api else arvados.safeapi.ThreadSafeApiCache(arvados.config.settings())
  39
  40     def make_mount(self, root_class, **root_kwargs):
  41         self.operations = fuse.Operations(
  42             os.getuid(), os.getgid(),
  43             api_client=self.api,
  44             enable_write=True)
  45         self.operations.inodes.add_entry(root_class(
  46             llfuse.ROOT_INODE, self.operations.inodes, self.api, 0, **root_kwargs))
  47         llfuse.init(self.operations, self.mounttmp, [])
  48         threading.Thread(None, llfuse.main).start()
  49         # wait until the driver is finished initializing
  50         self.operations.initlock.wait()
  51         return self.operations.inodes[llfuse.ROOT_INODE]
  52
  53     def tearDown(self):
  54         self.pool.terminate()
  55         self.pool.join()
  56         del self.pool
  57
  58         # llfuse.close is buggy, so use fusermount instead.
  59         #llfuse.close(unmount=True)
  60
  61         count = 0
  62         success = 1
  63         while (count < 9 and success != 0):
  64           success = subprocess.call(["fusermount", "-u", self.mounttmp])
  65           time.sleep(0.1)
  66           count += 1
  67
  68         self.operations.destroy()
  69
  70         os.rmdir(self.mounttmp)
  71         if self.keeptmp:
  72             shutil.rmtree(self.keeptmp)
  73             os.environ.pop('KEEP_LOCAL_STORE')
  74         run_test_server.reset()
  75
  76     def assertDirContents(self, subdir, expect_content):
  77         path = self.mounttmp
  78         if subdir:
  79             path = os.path.join(path, subdir)
  80         self.assertEqual(sorted(expect_content), sorted(llfuse.listdir(path)))