services/fuse/tests/mount_test_base.py

   1 import arvados
   2 import arvados_fuse as fuse
   3 import arvados.safeapi
   4 import llfuse
   5 import logging
   6 import multiprocessing
   7 import os
   8 import run_test_server
   9 import shutil
  10 import signal
  11 import subprocess
  12 import sys
  13 import tempfile
  14 import threading
  15 import time
  16 import unittest
  17
  18 logger = logging.getLogger('arvados.arv-mount')
  19
  20 class MountTestBase(unittest.TestCase):
  21     def setUp(self, api=None, local_store=True):
  22         # The underlying C implementation of open() makes a fstat() syscall
  23         # with the GIL still held.  When the GETATTR message comes back to
  24         # llfuse (which in these tests is in the same interpreter process) it
  25         # can't acquire the GIL, so it can't service the fstat() call, so it
  26         # deadlocks.  The workaround is to run some of our test code in a
  27         # separate process.  Forturnately the multiprocessing module makes this
  28         # relatively easy.
  29         self.pool = multiprocessing.Pool(1)
  30
  31         if local_store:
  32             self.keeptmp = tempfile.mkdtemp()
  33             os.environ['KEEP_LOCAL_STORE'] = self.keeptmp
  34         else:
  35             self.keeptmp = None
  36         self.mounttmp = tempfile.mkdtemp()
  37         run_test_server.run()
  38         run_test_server.authorize_with("admin")
  39         self.api = api if api else arvados.safeapi.ThreadSafeApiCache(arvados.config.settings())
  40         self.llfuse_thread = None
  41
  42     # This is a copy of Mount's method.  TODO: Refactor MountTestBase
  43     # to use a Mount instead of copying its code.
  44     def _llfuse_main(self):
  45         try:
  46             llfuse.main()
  47         except:
  48             llfuse.close(unmount=False)
  49             raise
  50         llfuse.close()
  51
  52     def make_mount(self, root_class, **root_kwargs):
  53         self.operations = fuse.Operations(
  54             os.getuid(), os.getgid(),
  55             api_client=self.api,
  56             enable_write=True)
  57         self.operations.inodes.add_entry(root_class(
  58             llfuse.ROOT_INODE, self.operations.inodes, self.api, 0, **root_kwargs))
  59         llfuse.init(self.operations, self.mounttmp, [])
  60         self.llfuse_thread = threading.Thread(None, lambda: self._llfuse_main())
  61         self.llfuse_thread.daemon = True
  62         self.llfuse_thread.start()
  63         # wait until the driver is finished initializing
  64         self.operations.initlock.wait()
  65         return self.operations.inodes[llfuse.ROOT_INODE]
  66
  67     def tearDown(self):
  68         if self.llfuse_thread:
  69             subprocess.call(["fusermount", "-u", "-z", self.mounttmp])
  70             t0 = time.time()
  71             self.llfuse_thread.join(timeout=10)
  72             if self.llfuse_thread.is_alive():
  73                 logger.warning("MountTestBase.tearDown():"
  74                                " llfuse thread still alive 10s after umount"
  75                                " -- exiting with SIGKILL")
  76                 os.kill(os.getpid(), signal.SIGKILL)
  77             waited = time.time() - t0
  78             if waited > 0.1:
  79                 logger.warning("MountTestBase.tearDown(): waited %f s for llfuse thread to end", waited)
  80
  81         os.rmdir(self.mounttmp)
  82         if self.keeptmp:
  83             shutil.rmtree(self.keeptmp)
  84             os.environ.pop('KEEP_LOCAL_STORE')
  85         run_test_server.reset()
  86         self.pool.close()
  87         self.pool.join()
  88
  89     def assertDirContents(self, subdir, expect_content):
  90         path = self.mounttmp
  91         if subdir:
  92             path = os.path.join(path, subdir)
  93         self.assertEqual(sorted(expect_content), sorted(llfuse.listdir(path)))