From: "Patrick Brünn" <P.Bruenn@beckhoff.com>
To: "herbert@gondor.apana.org.au" <herbert@gondor.apana.org.au>
Cc: "dash@vger.kernel.org" <dash@vger.kernel.org>
Subject: Re: eval: Do not cache value of eflag in evaltree
Date: Wed, 19 May 2021 08:08:16 +0000 [thread overview]
Message-ID: <b2f9eabc5850a26df6efae657043c0565d46c63e.camel@beckhoff.com> (raw)
In-Reply-To: <20210517071923.vv3qfm23mven7je3@gondor.apana.org.au>
On Mon, 2021-05-17 at 15:19 +0800, Herbert Xu wrote:
> Patrick Brünn <P.Bruenn@beckhoff.com> wrote:
> >
> > Since we are migrating to Debian bullseye, we discovered a new behavior
> > with our scripts, which look like this:
> > > #!/bin/sh
> > > cleanup() {
> > > set +e^M
> > > rmdir ""
> > > }
> > > set -eu
> > > trap 'cleanup' EXIT INT TERM
> > > echo 'Hello world!'
> >
> > With old dash v0.5.10.2 this script would return 0 as we expected it.
> > But since commit 62cf6955f8abe875752d7163f6f3adbc7e49ebae it returns
> > the last exit code of our cleanup function.
> > Reverting that commit gives a merge conflict, but it seems to fix _our_
> > problem. As that topic appears too complex to us I want to ask the
> > experts here:
> >
> > Is this change in behavior intended, by dash?
> >
> > Our workaround at the moment would be:
> > > trap 'cleanup || true' EXIT INT TERM
>
> Thanks for the report. This is actually a fairly old bug with
> set -e that's just been exposed by the exit status change. What's
> really happening is that cleanup itself is triggering a set -e
> exit incorrectly because evaltree cached the value of eflag prior
> to the function call.
>
> This patch should fix the problem.
>
> Reported-by: Patrick Brünn <P.Bruenn@beckhoff.com>
> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
>
> diff --git a/src/eval.c b/src/eval.c
> index 9476fbb..3337f71 100644
> --- a/src/eval.c
> +++ b/src/eval.c
> @@ -252,18 +252,10 @@ evaltree(union node *n, int flags)
> popredir(0);
> goto setstatus;
> case NCMD:
> -#ifdef notyet
> - if (eflag && !(flags & EV_TESTED))
> - checkexit = ~0;
> - status = evalcommand(n, flags, (struct backcmd *)NULL);
> - goto setstatus;
> -#else
> evalfn = evalcommand;
> checkexit:
> - if (eflag && !(flags & EV_TESTED))
> - checkexit = ~0;
> + checkexit = ~flags & EV_TESTED;
> goto calleval;
> -#endif
> case NFOR:
> evalfn = evalfor;
> goto calleval;
> @@ -323,7 +315,7 @@ setstatus:
> out:
> dotrap();
>
> - if (checkexit & status)
> + if (eflag && checkexit && status)
> goto exexit;
>
> if (flags & EV_EXIT) {
> --
Working for us, thanks!
Tested-by: Patrick Brünn <P.Bruenn@beckhoff.com>
Beckhoff Automation GmbH & Co. KG | Managing Director: Dipl. Phys. Hans Beckhoff Registered office: Verl, Germany | Register court: Guetersloh HRA 7075
prev parent reply other threads:[~2021-05-19 8:23 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-06 9:55 trap overwrites last exit code Patrick Brünn
2021-05-17 7:19 ` eval: Do not cache value of eflag in evaltree Herbert Xu
2021-05-19 8:08 ` Patrick Brünn [this message]
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