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
>               CYGWIN*|MINGW*)
>                       false
>                       ;;
>               *)
>                       rm -f testfifo && mkfifo testfifo
>                       ;;
>               esac
>       '
> 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.


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