From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mp2 ([2001:41d0:2:4a6f::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by ms11 with LMTPS id MLLTK2ueu1+IRwAA0tVLHw (envelope-from ) for ; Mon, 23 Nov 2020 11:35:07 +0000 Received: from aspmx1.migadu.com ([2001:41d0:2:4a6f::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by mp2 with LMTPS id kPK0J2ueu18XUgAAB5/wlQ (envelope-from ) for ; Mon, 23 Nov 2020 11:35:07 +0000 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by aspmx1.migadu.com (Postfix) with ESMTPS id 78A659404C4 for ; Mon, 23 Nov 2020 11:35:07 +0000 (UTC) Received: from localhost ([::1]:35178 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1khA7e-0000Rq-E9 for larch@yhetil.org; Mon, 23 Nov 2020 06:35:06 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:53902) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1khA7M-0000Qy-KP for guix-devel@gnu.org; Mon, 23 Nov 2020 06:34:49 -0500 Received: from fencepost.gnu.org ([2001:470:142:3::e]:41457) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1khA7K-0007mk-W8 for guix-devel@gnu.org; Mon, 23 Nov 2020 06:34:48 -0500 Received: from [2a01:e0a:1d:7270:af76:b9b:ca24:c465] (port=49598 helo=ribbon) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1khA7K-0001c2-5a; Mon, 23 Nov 2020 06:34:46 -0500 From: =?utf-8?Q?Ludovic_Court=C3=A8s?= To: Mathieu Othacehe Subject: Re: 01/03: guix: store: Add ensure-path. References: <20201122161938.30063.63195@vcs0.savannah.gnu.org> <20201122161940.6485520981@vcs0.savannah.gnu.org> <87mtz9knjl.fsf@gnu.org> <87tutgwi7h.fsf@gnu.org> X-URL: http://www.fdn.fr/~lcourtes/ X-Revolutionary-Date: 3 Frimaire an 229 de la =?utf-8?Q?R=C3=A9volution?= X-PGP-Key-ID: 0x090B11993D9AEBB5 X-PGP-Key: http://www.fdn.fr/~lcourtes/ludovic.asc X-PGP-Fingerprint: 3CE4 6455 8A84 FDC6 9DB4 0CFB 090B 1199 3D9A EBB5 X-OS: x86_64-pc-linux-gnu Date: Mon, 23 Nov 2020 12:34:44 +0100 In-Reply-To: <87tutgwi7h.fsf@gnu.org> (Mathieu Othacehe's message of "Mon, 23 Nov 2020 10:11:46 +0100") Message-ID: <87o8jojoh7.fsf@gnu.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-BeenThere: guix-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Development of GNU Guix and the GNU System distribution." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: guix-devel@gnu.org Errors-To: guix-devel-bounces+larch=yhetil.org@gnu.org Sender: "Guix-devel" X-Scanner: ns3122888.ip-94-23-21.eu Authentication-Results: aspmx1.migadu.com; dkim=none; dmarc=pass (policy=none) header.from=gnu.org; spf=pass (aspmx1.migadu.com: domain of guix-devel-bounces@gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=guix-devel-bounces@gnu.org X-Spam-Score: -1.51 X-TUID: FenisHOfPoeX Hi, Mathieu Othacehe skribis: >> Looking at LocalStore::ensurePath, I don=E2=80=99t think a GC root is ma= de. >> You have to call =E2=80=98add-temp-root=E2=80=99 if you want that to hap= pen, no? > > Yes, I think we do indeed. So perhaps we should adjust the docstring to reflect that? >> However =E2=80=98ensure-path=E2=80=99 can substitute the store item, whi= ch I suppose >> means you can substitute .drv files without building them, am I right? > > Yes I'm using it this way: > > (define (add-to-store outputs url) > (with-store store > (for-each (lambda (output) > (add-to-locks-held store output) > (add-substitute-url store url) > (ensure-path store output)) > (map derivation-output-path outputs)))) > > to fetch substitutes without building derivations. The painful part is > that I have to use my own custom RPC: AddToLocksHeld, so that I can add > the substitute to the store even if the output lock is held. Yeah, =E2=80=98guix offload=E2=80=99 should not connect to the daemon. It = does so currently for one thing (registering GC roots IIRC), which should be done in Scheme instead. > At first, I planned to use "restore-file-set" from (guix nar) but it > only handles nar files produced by "guix archive --export". Specifically it handles =E2=80=9Cnar bundles=E2=80=9D (new name :-)). But = probably you can extract the relevant bits to import single nars, right? Thanks, Ludo=E2=80=99.