"No such file or directory" errors when listing a directory

[jacobsa]

As mentioned at the end of #28, there are problems with ls -l on an empty directory:

jacobsa@jacobsa-macpro:~/tmp% ls -l mp/
total 0
drwx------  1 jacobsa  eng  0 Aug 31  1754 foo
-rwx------  1 jacobsa  eng  0 Mar 31 16:28 foo?


jacobsa@jacobsa-macpro:~/tmp% ls -l mp/foo/
ls: foo: No such file or directory


jacobsa@jacobsa-macpro:~/tmp% ls -l mp/foo/
ls: foo: No such file or directory

I believe this is because this code doesn't filter out itself from the prefix-based results returned from GCS. The equivalent code used to, but must have regressed at some point during refactoring.

The reason this isn't reproduced in the integration tests is that ioutil.ReadDir ignores ENOENT when statting the names it reads from the directory, silently filtering out such entries.

So, update the integration tests to use a pickier version of ioutil.ReadDir, then fix the bug.