tree 0a27f673b1bccdd9fac1478e078dedd4a629aa7a
parent f045d49a71b64b854589c8821d8bf220c6ed9fd3
author David James <davidjames@google.com> 1388096413 -0800
committer David James <davidjames@google.com> 1388098740 -0800

Fix os.mkdir race condition.

This code checks whether a dir exists before creating it. In between the
check and the mkdir call, it is possible that another process will have
created the directory. We have seen this bug occur many times in
practice during our 'repo init' tests.

Change-Id: Ia47d39955739aa38fd303f4e90be7b4c50d9d4ba