*.recon become none accessible after unit test

[yanwei]

If we run the unit test in a swift installed environment,the *.recon files may become none accessible.
1、Before the unit test,the owners of there files are swift
ll /var/cache/swift/
total 12
-rw------- 1 swift swift 461 Jan 22 10:50 account.recon
-rw------- 1 swift swift 506 Jan 22 10:50 container.recon
-rw------- 1 swift swift 1616 Jan 22 10:50 object.recon

2、After we run the unit test with some other user such as root,we get a change of these files
ll /var/cache/swift/
total 12
-rw------- 1 root root 462 Jan 22 11:02 account.recon
-rw------- 1 root root 545 Jan 22 11:04 container.recon
-rw------- 1 swift swift 1614 Jan 22 11:04 object.recon

3、And then these files are none accessible to those swift service,we will see some error messages in the swift log file
Jan 21 04:04:27 yanweitest1 container-server: Exception dumping recon cache: #012Traceback (most recent call last):#012 File "/usr/lib/python2.7/site-packages/swift/common/utils.py", line 3207, in dump_recon_cache#012 with lock_file(cache_file, lock_timeout, unlink=False) as cf:#012 File "/usr/lib64/python2.7/contextlib.py", line 17, in __enter__#012 return self.gen.next()#012 File "/usr/lib/python2.7/site-packages/swift/common/utils.py", line 2393, in lock_file#012 fd = os.open(filename, flags)#012OSError: [Errno 13] Permission denied: '/var/cache/swift/container.recon'
Jan 21 04:04:38 yanweitest1 account-server: Exception dumping recon cache: #012Traceback (most recent call last):#012 File "/usr/lib/python2.7/site-packages/swift/common/utils.py", line 3207, in dump_recon_cache#012 with lock_file(cache_file, lock_timeout, unlink=False) as cf:#012 File "/usr/lib64/python2.7/contextlib.py", line 17, in __enter__#012 return self.gen.next()#012 File "/usr/lib/python2.7/site-packages/swift/common/utils.py", line 2393, in lock_file#012 fd = os.open(filename, flags)#012OSError: [Errno 13] Permission denied: '/var/cache/swift/account.recon'
Jan 21 04:04:49 yanweitest1 object-server: Exception dumping recon cache: #012Traceback (most recent call last):#012 File "/usr/lib/python2.7/site-packages/swift/common/utils.py", line 3207, in dump_recon_cache#012 with lock_file(cache_file, lock_timeout, unlink=False) as cf:#012 File "/usr/lib64/python2.7/contextlib.py", line 17, in __enter__#012 return self.gen.next()#012 File "/usr/lib/python2.7/site-packages/swift/common/utils.py", line 2393, in lock_file#012 fd = os.open(filename, flags)#012OSError: [Errno 13] Permission denied: '/var/cache/swift/object.recon'

[yanwei (yanwei)]

Although，the scene that running unit test in the same node with the swift installation is unfrequent.But I think if we do some improvements to the unit test cases ,we will save a little time of those guys who encounter this situation.

[clayg (clay-gerrard)]

It's feasible to track down any current tests that coincidentally call dump_recon_cache and make sure the test properly configures recon_cache_path to a tempdir...

But for ongoing maintenance we might try to go as far as adding a guard in dump_recon_cache that can detect if the runtime is tests and disallow the default path of /var/cache/swift

maybe have something in test/__init__.py that sets a global flag in swift.common.utils