On Thu, Sep 08, 2016 at 10:05:58AM +0200, Johannes Schindelin wrote:
> > > Is fifo safe on Windows, though?
> > No clue. We seem to use mkfifo unconditionally in lib-daemon, but
> > perhaps people do not run that test on Windows. Other invocations seem
> > to be protected by the PIPE prerequisite. But...
> AFAICT we do not use mkfifo on Windows. Let's see what t/test-lib.sh has
> to say about the matter:
> test_lazy_prereq PIPE '
> # test whether the filesystem supports FIFOs
> case $(uname -s) in
> rm -f testfifo && mkfifo testfifo
> So there you go.
> The reason it is disabled is that Cygwin/MSYS2 do have a concept of a
> FIFO. But `git.exe` won't be able to access such a FIFO because it is
> emulated by the POSIX emulation layer, which Git cannot access.
Regarding my "unconditionally" above: coincidentally, I happened to be
looking in lib-git-daemon.sh about an hour ago and noticed that we do
indeed check "test_have_prereq PIPE" (just not near the mkfifo, of
course, because we are not in a test block).
It seems to have been added by a "Johannes Schindelin". Any relation?
So yeah. It definitely would be a bad idea to use a fifo in a test that
is already Windows-specific.