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Received: from 91-160-117-201.subs.proxad.net ([91.160.117.201]:56361 helo=ribbon) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1njRhr-0004Eq-Ur; Tue, 26 Apr 2022 16:22:44 -0400 From: Ludovic =?UTF-8?Q?Court=C3=A8s?= References: <20220417210107.27263-1-ludo@gnu.org> <22c9f92c9855e36b23ec70ba53fc6cf85c918527.camel@telenet.be> Date: Tue, 26 Apr 2022 22:22:42 +0200 In-Reply-To: <22c9f92c9855e36b23ec70ba53fc6cf85c918527.camel@telenet.be> (Maxime Devos's message of "Fri, 22 Apr 2022 17:02:03 +0200") Message-ID: <87y1zrk31p.fsf_-_@gnu.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: guix-patches@gnu.org List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: guix-patches-bounces+larch=yhetil.org@gnu.org Sender: "Guix-patches" X-Migadu-Flow: FLOW_IN X-Migadu-To: larch@yhetil.org X-Migadu-Country: US ARC-Message-Signature: i=1; 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aspmx1.migadu.com; dkim=fail ("headers rsa verify failed") header.d=gnu.org header.s=fencepost-gnu-org header.b="XjgRX1/4"; dmarc=pass (policy=none) header.from=gnu.org; spf=pass (aspmx1.migadu.com: domain of "guix-patches-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-patches-bounces+larch=yhetil.org@gnu.org" X-Migadu-Spam-Score: -3.91 Authentication-Results: aspmx1.migadu.com; dkim=fail ("headers rsa verify failed") header.d=gnu.org header.s=fencepost-gnu-org header.b="XjgRX1/4"; dmarc=pass (policy=none) header.from=gnu.org; spf=pass (aspmx1.migadu.com: domain of "guix-patches-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-patches-bounces+larch=yhetil.org@gnu.org" X-Migadu-Queue-Id: 9DF393898F X-Spam-Score: -3.91 X-Migadu-Scanner: scn1.migadu.com X-TUID: bx89XtKSBzUN Hi Maxime, Maxime Devos skribis: > Ludovic Court=C3=A8s schreef op zo 17-04-2022 om 23:01 [+0200]: >> Hello Guix! >>=20 >> So we have this fancy =E2=80=98make-forkexec-constructor/container=E2=80= =99 thing >> to spawn Shepherd services in a container: >>=20 >> =C2=A0 https://guix.gnu.org/en/blog/2017/running-system-services-in-cont= ainers/ >>=20 >> It=E2=80=99s nice, but it doesn=E2=80=99t compose.=C2=A0 What if you wan= t an inetd-style >> service *and* have it run in a container?=C2=A0 We certainly don=E2=80= =99t want to >> end up defining =E2=80=98make-inetd-constructor/container=E2=80=99 and s= o on. > > Currently, it doesn't compose, but can it be made composable? > More concretely, maybe there could be a set of =E2=80=98process procedure= s=E2=80=99 > implementable by record types: > > ;; Inspired by , > ;; with some differences > (define (subprocess-start/separate process) ...) ; run it in a separat= e process > (define (subprocess-start/replace process) ...) ; run it with 'exec' > (define (subprocess-kill process) ...) > (define (subprocess-wait process) ...) > (define (subprocess-status process) ...) > > ;; Basic process constructor, doesn't do containers > (define (command-process ...) ...) > > ;; Container > (define (contain inner #:key container-stuff ...) > subprocess-start/separate: (run-container ... (lambda () (subprocess-= start/replace inner))) > other procedures ... > return the record) > > Then make-inetd-constructor could be changed to accept a lambda producing > 'subprocess' records. By passing it a subprocess wrapped by 'contain', i= t would > automatically support container things: > > (define (make-inetd-constructor/container-command command* ...) > (make-inetd-constructor (lambda () (contain (command-process comand*)))= ...)) A (sub)process abstraction could be useful, indeed. But like you write, we=E2=80=99d need further changes in shepherd itself, w= hich makes it less appealing IMO. I like that the =E2=80=9CPOLA wrapper=E2=80= =9D allows us to deal with this aspect in a fairly orthogonal fashion. Thanks! Ludo=E2=80=99.