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Thu, 23 Mar 2023 07:00:56 -0700 (PDT) MIME-Version: 1.0 From: Vladilen Kozin Date: Thu, 23 Mar 2023 14:00:45 +0000 Message-ID: Subject: proper way to satisfy service dependencies To: guix-devel@gnu.org Content-Type: multipart/alternative; boundary="000000000000a080c905f791b4c4" Received-SPF: pass client-ip=2a00:1450:4864:20::530; envelope-from=vladilen.kozin@gmail.com; helo=mail-ed1-x530.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: guix-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Development of GNU Guix and the GNU System distribution." List-Unsubscribe: , List-Archive: List-Post: X-Migadu-Queue-Id: 799601875D X-Spam-Score: -6.28 X-Migadu-Spam-Score: -6.28 X-Migadu-Scanner: scn0.migadu.com List-Help: List-Subscribe: , Errors-To: guix-devel-bounces+larch=yhetil.org@gnu.org Sender: guix-devel-bounces+larch=yhetil.org@gnu.org X-Migadu-Country: US X-Migadu-Flow: FLOW_IN X-TUID: uQYU07hDVUPG --000000000000a080c905f791b4c4 Content-Type: text/plain; charset="UTF-8" Hi. When I have a package whose only purpose in life is to be started as daemon by e.g. Shepherd how would I satisfy its binary dependencies when defining a service? For packages this is normally part of their (inputs ...) slot, but IIUC this only makes it so these dependencies will be added to the same profile used when installing said package. But when I define a service there's no profile to speak of, so as part of the service definition I need to make sure I satisfy its dependencies. Say, when I start a network service that needs to run `iptables`. The one time I ran into this, I managed by pulling `iptables` module into derivation context and adding its /sbin to PATH in: (make-forkexec-constructor ... #:environment-variables (let ((iptables (string-append #$iptables "/sbin"))) ... extend PATH= here ...)) Another approach could be wrapping the daemon binary itself as part of its package definition, so something like (wrap-program ... ) that makes sure `iptables` is in PATH of that wrapper. I kinda wish there was a simpler way to just declare what you need as part of service definition. What's the preferred approach here? Thanks -- Best regards Vlad Kozin --000000000000a080c905f791b4c4 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi.

When I have a package whose only purpose in life is to be st= arted as daemon by e.g. Shepherd how would I satisfy its binary dependencie= s when defining a service? For packages this is normally part of their (inp= uts ...) slot, but IIUC this only makes it so these dependencies will be ad= ded to the same profile used when installing said package. But when I defin= e a service there's no profile to speak of, so as part of the service d= efinition I need to make sure I satisfy its dependencies. Say, when I start= a network service that needs to run `iptables`.

The one time I ran into t= his, I managed by pulling `iptables` module into derivation context and add= ing its /sbin to PATH in:
(make-forkexec-constructor ...
=C2=A0 #:environment-v= ariables
=C2=A0 (let ((iptables (string-append #$iptables "/sbin"))= )
= =C2=A0 =C2=A0 =C2=A0... extend PATH=3D here ...))

Another approach could b= e wrapping the daemon binary itself as part of its package definition, so s= omething like (wrap-program ... ) that makes sure `iptables` is in PATH of = that wrapper.

I kinda wish there was a simpler way to just declare what yo= u need as part of service definition.

What's the preferred approach he= re?

Thanks
--
Be= st regards
Vlad Kozin
--000000000000a080c905f791b4c4--