Re: [PATCH 4/8] doc: simplify the handling of interruptions

From: Felipe Contreras <felipe.contreras@gmail.com>
To: Junio C Hamano <gitster@pobox.com>,
	Felipe Contreras <felipe.contreras@gmail.com>
Cc: git@vger.kernel.org, "Jeff King" <peff@peff.net>,
	"Martin Ågren" <martin.agren@gmail.com>,
	"brian m . carlson" <sandals@crustytoothpaste.net>
Subject: Re: [PATCH 4/8] doc: simplify the handling of interruptions
Date: Thu, 13 May 2021 01:10:18 -0500	[thread overview]
Message-ID: <609cc2ca7cf26_1e7820868@natae.notmuch> (raw)
In-Reply-To: <xmqqmtszb47p.fsf@gitster.g>

Junio C Hamano wrote:
> Felipe Contreras <felipe.contreras@gmail.com> writes:
> 
> > +"${args[@]}" -o "$out" "$1" ||
> > +{ rm -f "$out"; false; }
> 
> It would be so nice if this worked, but here is what I saw in a
> quick-and-dirty experiment:
> 
>     $ f hoi || rm hoi ;# wait a bit and hit ^C
> 
> So, I suspect it unfortunately may not work well.

That's because the interrupt signal is not caught.

This works:

  sh -c 'echo foo >"$1" && trap "exit 1" INT && sleep 20' test hoi || rm hoi

And so does this:

  #!/bin/sh

  ruby - hoi <<EOF || rm hoi
  File.write(ARGV[0], 'foo')
  begin
    sleep(10)
  rescue Exception
    exit(1)
  end
  EOF

Both asciidoc and asciidoctor trap the signal.

> We need to get 2/8 redone without bash-ism,

Yes, if we agree this approach is indeed desirable I can do that.

Cheers.

-- 
Felipe Contreras