> -----Original Message-----
> From: René Scharfe [mailto:l....@web.de]
> Sent: Saturday, December 16, 2017 7:12 AM
> To: Git List <git@vger.kernel.org>
> Cc: Junio C Hamano <gits...@pobox.com>; Ben Peart
> <ben.pe...@microsoft.com>; Ævar Arnfjörð Bjarmason
> <ava...@gmail.com>
> Subject: [PATCH] p7519: improve check for prerequisite WATCHMAN
> 
> The return code of command -v with a non-existing command is 1 in bash
> and 127 in dash.  Use that return code directly to allow the script to work
> with dash and without watchman (e.g. on Debian).
> 
> While at it stop redirecting the output.  stderr is redirected to /dev/null by
> test_lazy_prereq already, and stdout can actually be useful -- the path of the
> found watchman executable is sent there, but it's shown only if the script
> was run with --verbose.
> 
> Signed-off-by: Rene Scharfe <l....@web.de>
> ---
>  t/perf/p7519-fsmonitor.sh | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/t/perf/p7519-fsmonitor.sh b/t/perf/p7519-fsmonitor.sh index
> 16d1bf72e5..65e145c02d 100755
> --- a/t/perf/p7519-fsmonitor.sh
> +++ b/t/perf/p7519-fsmonitor.sh
> @@ -40,8 +40,7 @@ test_lazy_prereq UNTRACKED_CACHE '
>  '
> 
>  test_lazy_prereq WATCHMAN '
> -     { command -v watchman >/dev/null 2>&1; ret=$?; } &&
> -     test $ret -ne 1
> +     command -v watchman
>  '

Looks good to me.  I tested this on Windows and it still works with and without 
watchman.  Thanks for the update to get this working on other platforms.

> 
>  if test_have_prereq WATCHMAN
> --
> 2.15.1

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