[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2290: allmydata.test.test_util.FileUtil.test_disk_stats sometimes fails on Travis

[Tahoe-LAFS]

#2290: allmydata.test.test_util.FileUtil.test_disk_stats sometimes fails on Travis
------------------------+--------------------------
     Reporter:  daira   |      Owner:
         Type:  defect  |     Status:  new
     Priority:  normal  |  Milestone:  undecided
    Component:  code    |    Version:  1.10.0
   Resolution:          |   Keywords:  tests travis
Launchpad Bug:          |
------------------------+--------------------------

Comment (by warner):

 I caught an instance of this with extra debug prints turned on, to dump
 the return value from statvfs

 https://travis-ci.org/tahoe-lafs/tahoe-lafs/jobs/35096649

 {{{
 allmydata.test.test_util.FileUtil.test_disk_stats ...
  STATVFS posix.statvfs_result(f_bsize=4096, f_frsize=4096,
 f_blocks=5242880, f_bfree=5242880, f_bavail=5242880, f_files=2621440,
 f_ffree=2621439, f_favail=2621439, f_flag=4096, f_namemax=255)
  STATVFS posix.statvfs_result(f_bsize=4096, f_frsize=4096,
 f_blocks=5242880, f_bfree=5242880, f_bavail=5242880, f_files=2621440,
 f_ffree=2621439, f_favail=2621439, f_flag=4096, f_namemax=255)
  GET_DISK_STATS {'free_for_root': 21474836480, 'avail': 21474828288,
 'free_for_nonroot': 21474836480, 'total': 21474836480, 'used': 0}

 Traceback (most recent call last):
   File "/home/travis/build/tahoe-lafs/tahoe-
 lafs/src/allmydata/test/test_util.py", line 523, in test_disk_stats
     self.failUnless(disk['used'] > 0, disk['used'])
   File "/home/travis/virtualenv/python2.6.9/lib/python2.6/site-
 packages/twisted/trial/_synctest.py", line 308, in assertTrue
     raise self.failureException(msg)
 twisted.trial.unittest.FailTest: 0

 [FAILURE]
 }}}

 From what I can tell, every call to the os.statvfs in get_disk_stats()
 in this particular run returned the same thing.

 In the passing test runs, os.statvfs() returns varying values.

--
Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2290#comment:1>
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