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[205.233.124.241]) by smtp.gmail.com with ESMTPSA id af79cd13be357-79bce89be37sm267887685a.17.2024.06.23.17.40.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 23 Jun 2024 17:40:11 -0700 (PDT) From: Maxim Cournoyer In-Reply-To: <7501182c5831ba86d4e600967fb944e9e1124352.1719066498.git.ludo@gnu.org> ("Ludovic =?UTF-8?Q?Court=C3=A8s?="'s message of "Sat, 22 Jun 2024 16:28:56 +0200") References: <20240306193725.17463-1-david.elsing@posteo.net> <7501182c5831ba86d4e600967fb944e9e1124352.1719066498.git.ludo@gnu.org> Date: Sun, 23 Jun 2024 20:40:09 -0400 Message-ID: <8734p3b2c6.fsf@gmail.com> User-Agent: Gnus/5.13 (Gnus v5.13) 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-bounces+larch=yhetil.org@gnu.org X-Migadu-Country: US X-Migadu-Flow: FLOW_IN X-Migadu-Queue-Id: 4132839F76 X-Migadu-Scanner: mx13.migadu.com X-Migadu-Spam-Score: -5.26 X-Spam-Score: -5.26 X-TUID: CE706zKipJJH Hi Ludovic, Ludovic Court=C3=A8s writes: > * gnu/services/shepherd.scm ()[free-form]: New field. > [start]: Add default value. > (shepherd-service-file): Rename to=E2=80=A6 > (shepherd-service-file/regular): =E2=80=A6 this. > (shepherd-service-file/free-form): New procedure. > (shepherd-service-file): Dispatch to one of the two procedures above. > * doc/guix.texi (Shepherd Services): Document the =E2=80=98free-form=E2= =80=99 field. > > Change-Id: I206374e950ef6d1e4a996c0f507fb5fcd9cadde3 > --- > doc/guix.texi | 26 +++++++++++++++++++++++++- > gnu/services/shepherd.scm | 25 ++++++++++++++++++++++--- > 2 files changed, 47 insertions(+), 4 deletions(-) > > Hi! > > This patch fixes a limitation that became apparent with Shepherd 0.10, > where users could not instantiate services from the built-in service > collection for which they do not explicitly specify the =E2=80=98start=E2= =80=99 > and =E2=80=98stop=E2=80=99 methods (see REPL service example below). > > Thoughts? > > Ludo=E2=80=99. > > diff --git a/doc/guix.texi b/doc/guix.texi > index 0102fd0fad3..4d9145445cc 100644 > --- a/doc/guix.texi > +++ b/doc/guix.texi > @@ -43909,7 +43909,7 @@ Shepherd Services > When true, this is the delay in seconds before restarting a failed > service. >=20=20 > -@item @code{start} > +@item @code{start} (default: @code{#~(const #t)}) > @itemx @code{stop} (default: @code{#~(const #f)}) > The @code{start} and @code{stop} fields refer to the Shepherd's > facilities to start and stop processes (@pxref{Service De- and > @@ -43928,6 +43928,30 @@ Shepherd Services > herd @var{action} @var{service} [@var{arguments}@dots{}] > @end example >=20=20 > +@item @code{free-form} (default: @code{#f}) > +When set, this field replaces the @code{start}, @code{stop}, and > +@code{actions} fields. It is meant to be used when the service > +definition comes from some other source, typically the service > +collection provided by the Shepherd proper (@pxref{Service Collection,,, > +shepherd, The GNU Shepherd Manual}). > + > +@cindex REPL service, for shepherd > +For example, the snippet below defines a service for the Shepherd's > +built-in @acronym{REPL, read-eval-print loop} service (@pxref{REPL > +Service,,, shepherd, The GNU Shepherd Manual}): > + > +@lisp > +(shepherd-service > + (provision '(repl)) > + (modules '((shepherd service repl))) > + (free-form #~(repl-service))) > +@end lisp > + > +In this case, the service object is returned by the @code{repl-service} > +procedure of the Shepherd, so all the @code{free-form} G-expression does > +is call that procedure. Note that the @code{provision} field must be > +consistent with the actual service provision. Hm, if free-form is expected to be a built-in procedure provided by Shepherd, should we call it 'built-in' instead of 'free-form' ? Or could it have a more general use that I'm not seeing. It seems the contract is that it could be any code used 'provision' a shepherd service object, overriding e.g. the start and stop slots. I guess that's more flexibility, and that its 'free-form' name is OK if that's so. The rest LGTM. --=20 Thanks, Maxim