tree d44a8ea6f9fe3c86fc89dd608b90595ed34dbf92
parent 9b7f221a3af2ee8495129621a5012647ffe15eb1
author Richard Miller <miller.research@gmail.com> 1519043693 +0000
committer David du Colombier <0intro@gmail.com> 1519132872 +0000

syscall: ensure Mkdir(path) on Plan 9 fails if path exists

On Plan 9, the underlying create() syscall with DMDIR flag, which is
used to implement Mkdir, will fail silently if the path exists and
is not a directory.  Work around this by checking for existence
first and rejecting Mkdir with error EEXIST if the path is found.

Fixes #23918

Change-Id: I439115662307923c9f498d3e7b1f32c6d205e1ad
Reviewed-on: https://go-review.googlesource.com/94777
Reviewed-by: David du Colombier <0intro@gmail.com>