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Re: [PATCH] t/lib-gpg: fix gpgconf stderr redirect to /dev/null

Todd Zullinger <tmz@xxxxxxxxx> writes:

> In 29ff1f8f74 (t: lib-gpg: flush gpg agent on startup, 2017-07-20), a
> call to gpgconf was added to kill the gpg-agent.  The intention was to
> ignore all output from the call, but the order of the redirection needs
> to be switched to ensure that both stdout and stderr are redirected to
> /dev/null.  Without this, gpgconf from gnupg-2.0 releases would output
> 'gpgconf: invalid option "--kill"' each time it was called.
> Signed-off-by: Todd Zullinger <tmz@xxxxxxxxx>
> ---
> I noticed that gpgconf produced error output for a number of tests on
> CentOS/RHEL.  As an example:
>     *** t5534-push-signed.sh ***
>     gpgconf: invalid option "--kill"
> Looking at the code in lib-gpg.sh, it appeared the intention was to ignore this
> output.  Reading through the review of the patch confirmed that feeling[1].  The
> current code gets caught by the subtleties of output redirection.  (Who hasn't
> been burned at some point by the difference between '2>&1 >/dev/null' and
> '>/dev/null 2>&1' ? ;)

**Blush**.  I should have caught this during the review.  Thanks.

> Lastly, I also noticed that git-rebase.sh uses the same 2>&1 >/dev/null.  I
> suspect it's similarly not intentional:
>     $ git grep -h -C4 '2>&1 >/dev/null' -- git-rebase.sh
>     apply_autostash () {
>     	if test -f "$state_dir/autostash"
>     	then
>     		stash_sha1=$(cat "$state_dir/autostash")
>     		if git stash apply $stash_sha1 2>&1 >/dev/null
>     		then
>     			echo "$(gettext 'Applied autostash.')" >&2
>     		else
>     			git stash store -m "autostash" -q $stash_sha1 ||
> I'll send a separate patch to adjust that code as well.

If it were intentional, the caller of apply_autostash() must be
expecting to see an error message from its standard output and
prepared to do something interesting with it, which I do not see, so
I agree that it is a typo.  Thanks.

I wonder if this line in 3320 is doing what it meant to do:

    test_must_fail git notes merge z 2>&1 >out &&
    test_i18ngrep "Automatic notes merge failed" out &&
    grep -v "A notes merge into refs/notes/x is already in-progress in" out