From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nikita Karetnikov <nikita@karetnikov.org>
Subject: Re: [PATCH] Add 'guix hash'.
Date: Fri, 05 Apr 2013 18:14:31 +0400
Message-ID: <871uap5ak8.fsf@karetnikov.org>
References: <87li92alhe.fsf@karetnikov.org> <874nforp12.fsf@gnu.org>
	<8762015b0w.fsf@karetnikov.org>
Mime-Version: 1.0
Content-Type: multipart/signed; boundary="=-=-=";
	micalg=pgp-sha1; protocol="application/pgp-signature"
Return-path: <bug-guix-bounces+gcggb-bug-guix=m.gmane.org@gnu.org>
Received: from eggs.gnu.org ([208.118.235.92]:34539)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <nikita@karetnikov.org>) id 1UO7N5-0003Km-4r
	for bug-guix@gnu.org; Fri, 05 Apr 2013 10:12:14 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <nikita@karetnikov.org>) id 1UO7Mv-000154-Lk
	for bug-guix@gnu.org; Fri, 05 Apr 2013 10:12:03 -0400
In-Reply-To: <8762015b0w.fsf@karetnikov.org> (Nikita Karetnikov's message of
	"Fri, 05 Apr 2013 18:04:31 +0400")
List-Id: Bug reports for GNU Guix <bug-guix.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/bug-guix>,
	<mailto:bug-guix-request@gnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/archive/html/bug-guix>
List-Post: <mailto:bug-guix@gnu.org>
List-Help: <mailto:bug-guix-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/bug-guix>,
	<mailto:bug-guix-request@gnu.org?subject=subscribe>
Errors-To: bug-guix-bounces+gcggb-bug-guix=m.gmane.org@gnu.org
Sender: bug-guix-bounces+gcggb-bug-guix=m.gmane.org@gnu.org
To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Cc: bug-guix@gnu.org

--=-=-=

> +         (if (file-exists? file)
> +             (format #t "~a~%"
> +                     (call-with-input-file file
> +                       (compose fmt sha256 get-bytevector-all)))

Oh, Mark warned me about 'file-exists?' some time ago.

How can I do the same but avoid a race condition?

--=-=-=
Content-Type: application/pgp-signature

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.10 (GNU/Linux)

iQIcBAEBAgAGBQJRXtxKAAoJEM+IQzI9IQ3852gP/13wdoVIeUVmV2gmyyz+vN2s
uOey8HkKrFZM4/T/xTu+VxyOvpBDmnL8Fi3G0DNyaLqPcdpNPZxNjKvIOLz50YON
BDwEbXcdGVBi0huok1jjQ5NIcmx6XMM/9JVHyNd2TIUj/iToI0atLnH/rUSvww1C
kw0gVIIO0WvPzPmJhhii1OjEz5l2b/OI2n6005a8avQ9OK+t/lkT6r6XnrjtriJ3
3jCB9Qem0EkT6U3YwsEgukRUCgYzlbB+GqK1pzvgJ2aceFWG8/ox7DxWWAz4645w
8RaH2GDjbKrX8JaPtpMWxgNP765rXyYwiZ7bks9/6pDzMoL7HZWfMoEZ+kUVVKtG
5koYeDk90QAfezLpPzc/2Sf3scq9a8wLcupr7ENcttQc3EIk8R9Xvt0Q0TFwyhFR
pFfWK8mIG0VBh0zLvbUu8lEjaSgCcG6tJcoNtxC+KsvPgECxqfuMRqELTRMvW/wy
Ktkhy9uyx14SrJhDBA/3hFJ3IO8dmu8KLJlYaC7tE5ypZA22Z9hrvtZmsNoNVPsK
K1xU/NtmsqRCogyJcz0aR3aeWtHGxy69PD14FHCG7ZR0dpVL0cOE807jYS2H2dh3
60i1jx/LVY+sRxgSuSpUxYqy8CFtc06CbkjZOGPWw6MpJ/TximsKrVbOXsfyMN9S
HwQmPJnS+rrQRcA3jHv/
=YxQe
-----END PGP SIGNATURE-----
--=-=-=--