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* gnu/packages/mpd.scm (mpd)[#:configure-flags]: Convert to G-Expression.
Add “-Dsystemd=enabled”.
[#:phases]: New argument.
[inputs]: Add elogind.
---
gnu/packages/mpd.scm | 19 ++++++++++++++++++-
1 file changed, 18 insertions(+), 1 deletion(-)
diff --git a/gnu/packages/mpd.scm b/gnu/packages/mpd.scm
index 1ee6806735..40e6a99ad7 100644
--- a/gnu/packages/mpd.scm
+++ b/gnu/packages/mpd.scm
@@ -47,6 +47,7 @@ (define-module (gnu packages mpd)
#:use-module (gnu packages boost)
#:use-module (gnu packages cdrom)
#:use-module (gnu packages cmake) ;for MPD
+ #:use-module (gnu packages freedesktop) ;elogind
#:use-module (gnu packages gettext)
#:use-module (gnu packages gnome)
#:use-module (gnu packages gnupg)
@@ -119,12 +120,28 @@ (define-public mpd
"1v969w7h3660ph3h2bdlkrzc05pfz95bmxjqdbzzf7pfwf795ifb"))))
(build-system meson-build-system)
(arguments
- `(#:configure-flags '("-Ddocumentation=enabled")))
+ (list
+ #:configure-flags #~(list "-Ddocumentation=enabled"
+ "-Dsystemd=enabled")
+ #:phases
+ #~(modify-phases %standard-phases
+ (add-after 'unpack 'enable-elogind
+ (lambda _
+ (substitute* "src/lib/systemd/meson.build"
+ (("libsystemd") "libelogind"))
+ ;; XXX: systemd dependency overwritten internally, leads to bad
+ ;; errors
+ (substitute* "src/lib/systemd/meson.build"
+ (("systemd_dep = declare_dependency" all)
+ (string-append "_" all)))
+ (substitute* "meson.build"
+ (("systemd_dep,") "systemd_dep, _systemd_dep,")))))))
(inputs (list ao
alsa-lib
avahi
boost
curl
+ elogind
ffmpeg
flac
fmt
--
2.35.1
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Liliana Marie Prikler <liliana.prikler@HIDDEN> Subject: bug#54986: Acknowledgement ([PATCH] gnu: mpd: Add support for socket activation.) Message-ID: <handler.54986.B.1650189840402.ack <at> debbugs.gnu.org> References: <9d4cc9d3ebb05d2aabf8f06e1890efe9b0b9a849.camel@HIDDEN> X-Gnu-PR-Message: ack 54986 X-Gnu-PR-Package: guix-patches X-Gnu-PR-Keywords: patch Reply-To: 54986 <at> debbugs.gnu.org Date: Sun, 17 Apr 2022 10:04:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): guix-patches@HIDDEN If you wish to submit further information on this problem, please send it to 54986 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 54986: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D54986 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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Subject: [bug#54986] [PATCH] gnu: mpd: Add support for socket activation.
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(Liliana Marie Prikler's message of "Sun, 17 Apr 2022 12:01:47 +0200")
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Hi,
Liliana Marie Prikler <liliana.prikler@HIDDEN> skribis:
> * gnu/packages/mpd.scm (mpd)[#:configure-flags]: Convert to G-Expression.
> Add =E2=80=9C-Dsystemd=3Denabled=E2=80=9D.
> [#:phases]: New argument.
> [inputs]: Add elogind.
LGTM!
Are you planning to update the service as well?
Thanks,
Ludo=E2=80=99.
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Am Sonntag, dem 17.04.2022 um 23:06 +0200 schrieb Ludovic Courtès:
> Hi,
>
> Liliana Marie Prikler <liliana.prikler@HIDDEN> skribis:
>
> > * gnu/packages/mpd.scm (mpd)[#:configure-flags]: Convert to G-
> > Expression.
> > Add “-Dsystemd=enabled”.
> > [#:phases]: New argument.
> > [inputs]: Add elogind.
>
> LGTM!
>
> Are you planning to update the service as well?
I'm not sure if updating the service is a good idea. On the upside,
people who report mpd starting too early will be alleviated of one
issue. On the downside, it appears as though mpd too easily escapes
shepherd's management. My current observations are more or less
consistent with what I saw with Emacs: killing the mpd service won't
stop playing music, and shepherd won't restart a killed MPD without
asked to. IMHO shepherd's socket activation still needs some work
before we can make it the default for every service.
Cheers
X-Loop: help-debbugs@HIDDEN
Subject: [bug#54986] [PATCH] gnu: mpd: Add support for socket activation.
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Hi,
Liliana Marie Prikler <liliana.prikler@HIDDEN> skribis:
> I'm not sure if updating the service is a good idea. On the upside,
> people who report mpd starting too early will be alleviated of one
> issue. On the downside, it appears as though mpd too easily escapes
> shepherd's management. My current observations are more or less
> consistent with what I saw with Emacs: killing the mpd service won't
> stop playing music,
Do you mean that =E2=80=98herd stop mpd=E2=80=99 doesn=E2=80=99t stop the m=
pd process?
What does /var/log/messages say?
> and shepherd won't restart a killed MPD without asked to.
Weird. What you describe sounds as if shepherd is not looking at the
right process or something.
If you have a service definition to reproduce this, I=E2=80=99d be happy to=
take
a look!
Thanks,
Ludo=E2=80=99.
X-Loop: help-debbugs@HIDDEN
Subject: [bug#54986] [PATCH] gnu: mpd: Add support for socket activation.
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Am Montag, dem 18.04.2022 um 23:05 +0200 schrieb Ludovic Courtès:
> Hi,
>
> Liliana Marie Prikler <liliana.prikler@HIDDEN> skribis:
>
> > I'm not sure if updating the service is a good idea. On the
> > upside, people who report mpd starting too early will be alleviated
> > of one issue. On the downside, it appears as though mpd too easily
> > escapes shepherd's management. My current observations are more or
> > less consistent with what I saw with Emacs: killing the mpd service
> > won't stop playing music,
>
> Do you mean that ‘herd stop mpd’ doesn’t stop the mpd process?
Yep.
> What does /var/log/messages say?
I don't think there's anything meaningful there to inspect, I'm running
this as a user service. Shepherd's own logs are rather empty.
Interestingly, the running value for the mpd service remains
(("unknown" . "#<input-output: socket 17>")) even after MPD started.
Should that be the case?
> > and shepherd won't restart a killed MPD without asked to.
>
> Weird. What you describe sounds as if shepherd is not looking at the
> right process or something.
>
> If you have a service definition to reproduce this, I’d be happy to
> take a look!
The second is probably just me forgetting to set #:respawn? #t. One
"bug" down, one more to go.
X-Loop: help-debbugs@HIDDEN
Subject: [bug#54986] [PATCH v2 1/3] gnu: mpd: Add support for socket activation.
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Content preview: * gnu/packages/mpd.scm (mpd)[#:configure-flags]: Convert to
G-Expression. Add =?UTF-8?Q?=E2=80=9C-Dsystemd=3Denabled=E2=80=9D.?= [#:phases]: New argument. [inputs]:
Add elogind. --- gnu/packages/mpd.scm | 19 ++++++++++++++++++ [...]
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* gnu/packages/mpd.scm (mpd)[#:configure-flags]: Convert to G-Expression.
Add “-Dsystemd=enabled”.
[#:phases]: New argument.
[inputs]: Add elogind.
---
gnu/packages/mpd.scm | 19 ++++++++++++++++++-
1 file changed, 18 insertions(+), 1 deletion(-)
diff --git a/gnu/packages/mpd.scm b/gnu/packages/mpd.scm
index 1ee6806735..40e6a99ad7 100644
--- a/gnu/packages/mpd.scm
+++ b/gnu/packages/mpd.scm
@@ -47,6 +47,7 @@ (define-module (gnu packages mpd)
#:use-module (gnu packages boost)
#:use-module (gnu packages cdrom)
#:use-module (gnu packages cmake) ;for MPD
+ #:use-module (gnu packages freedesktop) ;elogind
#:use-module (gnu packages gettext)
#:use-module (gnu packages gnome)
#:use-module (gnu packages gnupg)
@@ -119,12 +120,28 @@ (define-public mpd
"1v969w7h3660ph3h2bdlkrzc05pfz95bmxjqdbzzf7pfwf795ifb"))))
(build-system meson-build-system)
(arguments
- `(#:configure-flags '("-Ddocumentation=enabled")))
+ (list
+ #:configure-flags #~(list "-Ddocumentation=enabled"
+ "-Dsystemd=enabled")
+ #:phases
+ #~(modify-phases %standard-phases
+ (add-after 'unpack 'enable-elogind
+ (lambda _
+ (substitute* "src/lib/systemd/meson.build"
+ (("libsystemd") "libelogind"))
+ ;; XXX: systemd dependency overwritten internally, leads to bad
+ ;; errors
+ (substitute* "src/lib/systemd/meson.build"
+ (("systemd_dep = declare_dependency" all)
+ (string-append "_" all)))
+ (substitute* "meson.build"
+ (("systemd_dep,") "systemd_dep, _systemd_dep,")))))))
(inputs (list ao
alsa-lib
avahi
boost
curl
+ elogind
ffmpeg
flac
fmt
--
2.35.1
X-Loop: help-debbugs@HIDDEN
Subject: [bug#54986] [PATCH v2 2/3 WIP] services: shepherd: Add support for socket activation endpoints.
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* gnu/services/shepherd.scm (<shepherd-endpoint>): New record type.
(shepherd-endpoint->sexp): New variable.
* doc/guix.texi (Shepherd Services): Document it.
---
doc/guix.texi | 29 +++++++++++++++++++
gnu/services/shepherd.scm | 60 +++++++++++++++++++++++++++++++++++++++
2 files changed, 89 insertions(+)
diff --git a/doc/guix.texi b/doc/guix.texi
index 5399584cb0..38aeda1d2d 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -37675,6 +37675,35 @@ This, as you can see, is a fairly sophisticated way to say hello.
info on actions.
@end deftp
+@deftp {Data Type} shepherd-endpoint
+This is an endpoint that a systemd-style shepherd service listens on.
+
+@table @code
+@item address
+This is the socket address that shepherd binds and forwards to the service.
+
+@item name
+‾\_(ツ)_/‾
+
+@item style
+‾\_(ツ)_/‾
+
+@item backlog
+‾\_(ツ)_/‾
+
+@item socket-owner
+This is the user ID owning the socket.
+
+@item socket-group
+This is the group ID owning the socket.
+
+@item socket-directory-permissions
+These are the UNIX permissions to set for the directory the socket
+resides in.
+
+@end table
+@end deftp
+
@defvr {Scheme Variable} shepherd-root-service-type
The service type for the Shepherd ``root service''---i.e., PID@tie{}1.
diff --git a/gnu/services/shepherd.scm b/gnu/services/shepherd.scm
index 4fd4b2a497..3ef0023d7f 100644
--- a/gnu/services/shepherd.scm
+++ b/gnu/services/shepherd.scm
@@ -66,6 +66,16 @@ (define-module (gnu services shepherd)
shepherd-action-documentation
shepherd-action-procedure
+ shepherd-endpoint
+ shepherd-endpoint-address
+ shepherd-endpoint-name
+ shepherd-endpoint-style
+ shepherd-endpoint-backlog
+ shepherd-endpoint-socket-owner
+ shepherd-endpoint-socket-group
+ shepherd-endpoint-socket-directory-permissions
+ shepherd-endpoint->sexp
+
%default-modules
shepherd-service-file
@@ -183,6 +193,56 @@ (define %default-modules
((guix build utils) #:hide (delete))
(guix build syscalls)))
+(define-record-type* <shepherd-endpoint>
+ shepherd-endpoint make-shepherd-endpoint
+ shepherd-endpoint?
+ (address shepherd-endpoint-address) ; sockaddr
+ (name shepherd-endpoint-name ; string | #f
+ (default #f))
+ (style shepherd-endpoint-style ; int | #f
+ (default #f))
+ (backlog shepherd-endpoint-backlog ; int | #f
+ (default #f))
+ (socket-owner shepherd-endpoint-socket-owner ; uid | #f
+ (default #f))
+ (socket-group shepherd-endpoint-socket-group ; gid | #f
+ (default #f))
+ (socket-directory-permissions
+ shepherd-endpoint-socket-directory-permissions ; chmod pattern (int) | #f
+ (default #f)))
+
+(define (shepherd-endpoint->sexp endpoint)
+ (match endpoint
+ (($ <shepherd-endpoint> address
+ name style backlog socket-owner socket-group
+ socket-directory-permissions)
+ `(endpoint
+ ,(match (sockaddr:fam address)
+ ((? (cute = <> AF_INET) _)
+ `(make-socket-addr AF_INET
+ ,(sockaddr:addr address)
+ ,(sockaddr:port address)))
+ ((? (cute = <> AF_INET6) _)
+ `(make-socket-addr AF_INET6
+ ,(sockaddr:addr address)
+ ,(sockaddr:port address)
+ ,(sockaddr:flowinfo address)
+ ,(sockaddr:scopeid address)))
+ ((? (cute = <> AF_UNIX) _)
+ `(make-socket-addr AF_UNIX
+ ,(sockaddr:path address))))
+ ,@(fold
+ (match-lambda*
+ (((key value) seed)
+ (if value (cons* key value seed) seed)))
+ '()
+ `((#:name ,name)
+ (#:style ,style)
+ (#:backlog ,backlog)
+ (#:socket-owner ,socket-owner)
+ (#:socket-group ,socket-group)
+ (#:socket-directory-permissions ,socket-directory-permissions)))))))
+
(define-record-type* <shepherd-service>
shepherd-service make-shepherd-service
shepherd-service?
--
2.35.1
X-Loop: help-debbugs@HIDDEN
Subject: [bug#54986] [PATCH v2 3/3 WIP] services: mpd: Support socket activation.
References: <9d4cc9d3ebb05d2aabf8f06e1890efe9b0b9a849.camel@HIDDEN>
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* gnu/services/audio.scm (<mpd-configuration>)[shepherd-endpoints]: New field.
(mpd-shepherd-service): Use it.
* doc/guix.texi (Music Player Daemon): Document it.
---
doc/guix.texi | 7 +++++++
gnu/services/audio.scm | 45 ++++++++++++++++++++++++++++++------------
2 files changed, 39 insertions(+), 13 deletions(-)
diff --git a/doc/guix.texi b/doc/guix.texi
index 38aeda1d2d..6bfa854b1d 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -30883,6 +30883,13 @@ The port to run mpd on.
The address that mpd will bind to. To use a Unix domain socket,
an absolute path can be specified here.
+@item @code{shepherd-endpoints} (default: @code{'()})
+The endpoints shepherd shall bind and spawn MPD from. If this field is
+not empty (checked via @code{null?}), a systemd-style service is used
+rather than a forkexec-service. This delays the start of MPD until the
+first client connects. As a side effect @code{port} and @code{address}
+may be ignored.
+
@item @code{outputs} (default: @code{"(list (mpd-output))"})
The audio outputs that MPD can use. By default this is a single output using pulseaudio.
diff --git a/gnu/services/audio.scm b/gnu/services/audio.scm
index c60053f33c..b184ac596a 100644
--- a/gnu/services/audio.scm
+++ b/gnu/services/audio.scm
@@ -78,6 +78,8 @@ (define-record-type* <mpd-configuration>
(default "6600"))
(address mpd-configuration-address
(default "any"))
+ (shepherd-endpoints mpd-configuration-shepherd-endpoints
+ (default '())) ; list of <shepherd-endpoint>
(outputs mpd-configuration-outputs
(default (list (mpd-output)))))
@@ -140,19 +142,36 @@ (define (mpd-shepherd-service config)
(documentation "Run the MPD (Music Player Daemon)")
(requirement '(user-processes))
(provision '(mpd))
- (start #~(make-forkexec-constructor
- (list #$(file-append mpd "/bin/mpd")
- "--no-daemon"
- #$(mpd-config->file config))
- #:environment-variables
- ;; Required to detect PulseAudio when run under a user account.
- (list (string-append
- "XDG_RUNTIME_DIR=/run/user/"
- (number->string
- (passwd:uid
- (getpwnam #$(mpd-configuration-user config))))))
- #:log-file #$(mpd-file-name config "log")))
- (stop #~(make-kill-destructor))))
+ (start (if (null? (mpd-configuration-shepherd-endpoints config))
+ #~(make-forkexec-constructor
+ (list #$(file-append mpd "/bin/mpd")
+ "--no-daemon"
+ #$(mpd-config->file config))
+ #:environment-variables
+ ;; Required to detect PulseAudio when run under a user account.
+ (list (string-append
+ "XDG_RUNTIME_DIR=/run/user/"
+ (number->string
+ (passwd:uid
+ (getpwnam #$(mpd-configuration-user config))))))
+ #:log-file #$(mpd-file-name config "log"))
+ #~(make-systemd-constructor
+ (list #$(file-append mpd "/bin/mpd")
+ "--systemd"
+ #$(mpd-config->file config))
+ (list #$@(map shepherd-endpoint->sexp
+ (mpd-configuration-shepherd-endpoints config)))
+ #:environment-variables
+ ;; Required to detect PulseAudio when run under a user account.
+ (list (string-append
+ "XDG_RUNTIME_DIR=/run/user/"
+ (number->string
+ (passwd:uid
+ (getpwnam #$(mpd-configuration-user config))))))
+ #:log-file #$(mpd-file-name config "log"))))
+ (stop (if (null? (mpd-configuration-shepherd-endpoints config))
+ #~(make-kill-destructor)
+ #~(make-systemd-destructor)))))
(define (mpd-service-activation config)
(with-imported-modules '((guix build utils))
--
2.35.1
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--=-/XIYNXpxlgE+4QcTZ1oY
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> +(define (shepherd-endpoint->sexp endpoint)
> + (match endpoint
> + (($ <shepherd-endpoint> address
> + name style backlog socket-owner socket-
group
> + socket-directory-permissions)
> + `(endpoint
> + ,(match (sockaddr:fam address)
> + ((? (cute =3D <> AF_INET) _)
> + `(make-socket-addr AF_INET
> + ,(sockaddr:addr address)
> + ,(sockaddr:port address)))
Liliana Marie Prikler schreef op za 23-04-2022 om 16:39 [+0200]:
> + (list #$@(map shepherd-endpoint->sexp
> + (mpd-configuration-shepherd-endpoints con=
fig)))=C2=A0
For hygiene reasons, should 'shepherd-endpoint->sexp' use @?
`((@ (the module) endpoint)
,(match [...]
((@ [...] make-socket-addr (@ [...] AF_UNIX) ...)
...))
That way, no assumptions are made on what modules are imported and it
avoids hygiene problems like in
;; There are two =E2=80=98endpoints=E2=80=99 here: the =E2=80=98API endpo=
int=E2=80=99,
;; and Shepherd endpoints.
#~(let ((endpoint "http://localhost:1234/api"))
(make-systemd-constructor
(list #$(file-append soft "/bin/ware")
"--endpoint" #$endpoint)
(list (shepherd-endpoint->sexp ...))))
Greetings,
Maxime.
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Liliana Marie Prikler schreef op za 23-04-2022 om 16:39 [+0200]:
> +@item @code{shepherd-endpoints} (default: @code{'()})
> +The endpoints shepherd shall bind and spawn MPD from.=C2=A0 If this fiel=
d is
> +not empty (checked via @code{null?}), a systemd-style service is used
> +rather than a forkexec-service.
systemd-style / forkexec-service looks like an implementation detail to
me, not something useful to the user.
> =C2=A0This delays the start of MPD until the
> +first client connects.
>=20
Likewise.
> =C2=A0 As a side effect @code{port} and @code{address}
> +may be ignored.
Could these three fields be unified, keeping 'port' and 'address' only
for some backwards compatibility? E.g.:
(mpd-configuration
(endpoints (list (shepherd-endpoint [a AF_INET6 address])
(shepherd-endpoint [a AF_UNIX address]))))
Greetings,
Maxime.
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Am Samstag, dem 23.04.2022 um 19:35 +0200 schrieb Maxime Devos:
> Liliana Marie Prikler schreef op za 23-04-2022 om 16:39 [+0200]:
> > +@item @code{shepherd-endpoints} (default: @code{'()})
> > +The endpoints shepherd shall bind and spawn MPD from. If this
> > field is
> > +not empty (checked via @code{null?}), a systemd-style service is
> > used
> > +rather than a forkexec-service.
>
> systemd-style / forkexec-service looks like an implementation detail
> to me, not something useful to the user.
>
> > This delays the start of MPD until the
> > +first client connects.
>
> Likewise.
Even if this was just an implementation detail, I shall point to
Hyrum's law.
> > As a side effect @code{port} and @code{address}
> > +may be ignored.
>
> Could these three fields be unified, keeping 'port' and 'address'
> only for some backwards compatibility? E.g.:
>
> (mpd-configuration
> (endpoints (list (shepherd-endpoint [a AF_INET6 address])
> (shepherd-endpoint [a AF_UNIX address]))))
Not AFAIK. MPD is less strict than Guile when it comes to addresses,
so converting from address+port to socket addresses is nontrivial.
That being said, I'm not sure if they are even ignored. MPD only warns
about pid_file, so they might also be used.
Cheers
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From: Liliana Marie Prikler <liliana.prikler@HIDDEN>
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Am Samstag, dem 23.04.2022 um 19:31 +0200 schrieb Maxime Devos:
> > +(define (shepherd-endpoint->sexp endpoint)
> > + (match endpoint
> > + (($ <shepherd-endpoint> address
> > + name style backlog socket-owner
> > socket-
> group
> > + socket-directory-permissions)
> > + `(endpoint
> > + ,(match (sockaddr:fam address)
> > + ((? (cute = <> AF_INET) _)
> > + `(make-socket-addr AF_INET
> > + ,(sockaddr:addr address)
> > + ,(sockaddr:port address)))
>
> Liliana Marie Prikler schreef op za 23-04-2022 om 16:39 [+0200]:
> > + (list #$@(map shepherd-endpoint->sexp
> > + (mpd-configuration-shepherd-
> > endpoints config)))
>
> For hygiene reasons, should 'shepherd-endpoint->sexp' use @?
>
> `((@ (the module) endpoint)
> ,(match [...]
> ((@ [...] make-socket-addr (@ [...] AF_UNIX) ...)
> ...))
>
> That way, no assumptions are made on what modules are imported and it
> avoids hygiene problems like in
>
> ;; There are two ‘endpoints’ here: the ‘API endpoint’,
> ;; and Shepherd endpoints.
> #~(let ((endpoint "http://localhost:1234/api"))
> (make-systemd-constructor
> (list #$(file-append soft "/bin/ware")
> "--endpoint" #$endpoint)
> (list (shepherd-endpoint->sexp ...))))
Good point, that's should probably done for defensive programming.
Note also that I'm missing half of the documentation still, so it won't
be pushed too soon, though.
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Subject: [bug#54986] [PATCH] gnu: mpd: Add support for socket activation.
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Hi,
Liliana Marie Prikler <liliana.prikler@HIDDEN> skribis:
[...]
>> Do you mean that =E2=80=98herd stop mpd=E2=80=99 doesn=E2=80=99t stop th=
e mpd process?
> Yep.
>> What does /var/log/messages say?
> I don't think there's anything meaningful there to inspect, I'm running
> this as a user service. Shepherd's own logs are rather empty.
Then it=E2=80=99s in ~/.local/state (by default) or
~/.local/var/log/shepherd.log if you=E2=80=99re using Guix Home.
> Interestingly, the running value for the mpd service remains
> (("unknown" . "#<input-output: socket 17>")) even after MPD started.=20
> Should that be the case?
No.
>> > and shepherd won't restart a killed MPD without asked to.
>>=20
>> Weird.=C2=A0 What you describe sounds as if shepherd is not looking at t=
he
>> right process or something.
>>=20
>> If you have a service definition to reproduce this, I=E2=80=99d be happy=
to
>> take a look!
> The second is probably just me forgetting to set #:respawn? #t. One
> "bug" down, one more to go.
:-)
Ludo=E2=80=99.
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Subject: [bug#54986] [PATCH v2 2/3 WIP] services: shepherd: Add support for socket activation endpoints.
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Hi,
Liliana Marie Prikler <liliana.prikler@HIDDEN> skribis:
> * gnu/services/shepherd.scm (<shepherd-endpoint>): New record type.
> (shepherd-endpoint->sexp): New variable.
> * doc/guix.texi (Shepherd Services): Document it.
[...]
> +++ b/gnu/services/shepherd.scm
> @@ -66,6 +66,16 @@ (define-module (gnu services shepherd)
> shepherd-action-documentation
> shepherd-action-procedure
>=20=20
> + shepherd-endpoint
> + shepherd-endpoint-address
> + shepherd-endpoint-name
> + shepherd-endpoint-style
> + shepherd-endpoint-backlog
> + shepherd-endpoint-socket-owner
> + shepherd-endpoint-socket-group
> + shepherd-endpoint-socket-directory-permissions
> + shepherd-endpoint->sexp
> +
> %default-modules
>=20=20
> shepherd-service-file
> @@ -183,6 +193,56 @@ (define %default-modules
> ((guix build utils) #:hide (delete))
> (guix build syscalls)))
>=20=20
> +(define-record-type* <shepherd-endpoint>
I don=E2=80=99t think this is necessary: Shepherd endpoints are created in a
#~(make-systemd-constructor =E2=80=A6) gexp, it=E2=80=99s OK to use the She=
pherd
endpoint API there.
Ludo=E2=80=99.
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Subject: [bug#54986] [PATCH v2 3/3 WIP] services: mpd: Support socket activation.
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From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
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Liliana Marie Prikler <liliana.prikler@HIDDEN> skribis:
> * gnu/services/audio.scm (<mpd-configuration>)[shepherd-endpoints]: New f=
ield.
> (mpd-shepherd-service): Use it.
> * doc/guix.texi (Music Player Daemon): Document it.
[...]
> +++ b/gnu/services/audio.scm
> @@ -78,6 +78,8 @@ (define-record-type* <mpd-configuration>
> (default "6600"))
> (address mpd-configuration-address
> (default "any"))
> + (shepherd-endpoints mpd-configuration-shepherd-endpoints
> + (default '())) ; list of <shepherd-endpoint>
The way I see it, service configuration should be oblivious to whether
it=E2=80=99s started as =E2=80=9Cforkexec=E2=80=9D, systemd, or inetd.
There=E2=80=99s already an =E2=80=98address=E2=80=99 field above, so my sug=
gestion would be to
reuse it. This is what I did for example for the openssh service, and
also for bitlbee and dicod here:
https://issues.guix.gnu.org/54997#5
WDYT?
Thanks,
Ludo=E2=80=99.
X-Loop: help-debbugs@HIDDEN
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From: Liliana Marie Prikler <liliana.prikler@HIDDEN>
Date: Thu, 28 Apr 2022 18:45:13 +0200
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Am Mittwoch, dem 27.04.2022 um 22:56 +0200 schrieb Ludovic Courtès:
>
> > Interestingly, the running value for the mpd service remains
> > (("unknown" . "#<input-output: socket 17>")) even after MPD
> > started. Should that be the case?
>
> No.
It turns out the issue here was that I rewrote the service to put its
log into XDG_STATE_HOME as well, but under a directory that did not yet
exist. #55080 addresses this.
Cheers
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Subject: [bug#54986] [PATCH] gnu: mpd: Add support for socket activation.
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Hi Liliana,
What=E2=80=99s the status of this patch series? Would be nice to have it i=
n!
Ludo=E2=80=99.
Ludovic Court=C3=A8s <ludo@HIDDEN> skribis:
> Liliana Marie Prikler <liliana.prikler@HIDDEN> skribis:
>
>> * gnu/services/audio.scm (<mpd-configuration>)[shepherd-endpoints]: New =
field.
>> (mpd-shepherd-service): Use it.
>> * doc/guix.texi (Music Player Daemon): Document it.
>
> [...]
>
>> +++ b/gnu/services/audio.scm
>> @@ -78,6 +78,8 @@ (define-record-type* <mpd-configuration>
>> (default "6600"))
>> (address mpd-configuration-address
>> (default "any"))
>> + (shepherd-endpoints mpd-configuration-shepherd-endpoints
>> + (default '())) ; list of <shepherd-endpoint>
>
> The way I see it, service configuration should be oblivious to whether
> it=E2=80=99s started as =E2=80=9Cforkexec=E2=80=9D, systemd, or inetd.
>
> There=E2=80=99s already an =E2=80=98address=E2=80=99 field above, so my s=
uggestion would be to
> reuse it. This is what I did for example for the openssh service, and
> also for bitlbee and dicod here:
>
> https://issues.guix.gnu.org/54997#5
>
> WDYT?
>
> Thanks,
> Ludo=E2=80=99.
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From: Liliana Marie Prikler <liliana.prikler@HIDDEN>
Date: Fri, 13 May 2022 19:00:41 +0200
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Am Freitag, dem 13.05.2022 um 17:55 +0200 schrieb Ludovic Courtès:
> Hi Liliana,
>
> What’s the status of this patch series? Would be nice to have it in!
The patch for MPD itself is good to go as far as I'm aware, the patch
for the service type is work in progress.
This question
> Ludovic Courtès <ludo@HIDDEN> skribis:
> > The way I see it, service configuration should be oblivious to
> > whether it’s started as “forkexec”, systemd, or inetd.
has me in a bit of a bind in multiple ways. For one, I don't see a
direct translation from MPD's configuration scheme to shepherd's. For
another, the distinct semantics between forkexec and lazy loading cause
observable differences as in “What the fuck, I only ran mpc status, why
is the music now playing?” – this can be avoided if the user knows that
shepherd will be lazy-loading mpd and that it might as a result to
starting start playing on the first received command.
Moreover, I think the patch I added to make endpoint records
configurable from Guix could also serve to solve other bugs, e.g. SSH
only listening on IPv4 addresses, which would require us to be able to
specify whether to listen on IPv4, IPv6 or both through Guix. Long
term, I think we should only keep the distinction between forkexec and
inetd/systemd for those services where it makes an observable
difference, like mpd. For SSH, apart from bugs and perhaps people
using old shepherd, I don't think there'd be any reason to keep
forkexec beyond a certain point (in a future as distant as you would
want it to be).
Maxime also raised hygiene concerns that would be comparatively easy to
solve.
TL;DR: v2 [1/3] is good, [2/3 WIP] and [3/3 WIP] should be kept back
for now.
Cheers
X-Loop: help-debbugs@HIDDEN
Subject: [bug#54986] [PATCH v3 2/2] services: mpd: Support socket activation.
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Content preview: * gnu/services/audio.scm (<mpd-endpoint>): New record.
(<mpd-configuration>)[port,
address]: Removed fields. [endpoints]: New field. (sanitize-mpd-endpoints,
mpd-configuration-shepherd-endpoints): New [...]
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Content preview: * gnu/services/audio.scm (<mpd-endpoint>): New record. (<mpd-configuration>)[port,
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* gnu/services/audio.scm (<mpd-endpoint>): New record.
(<mpd-configuration>)[port, address]: Removed fields.
[endpoints]: New field.
(sanitize-mpd-endpoints, mpd-configuration-shepherd-endpoints): New variables.
(mpd-shepherd-service): Use mpd-configuration-shepherd-endpoints.
* doc/guix.texi (Music Player Daemon): Document it.
---
doc/guix.texi | 23 ++++++++--
gnu/services/audio.scm | 98 +++++++++++++++++++++++++++++++++---------
2 files changed, 97 insertions(+), 24 deletions(-)
diff --git a/doc/guix.texi b/doc/guix.texi
index 30cc3b6d45..d5b9de0de2 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -32192,15 +32192,30 @@ The location of the file that stores current MPD's state.
@item @code{sticker-file} (default: @code{"~/.mpd/sticker.sql"})
The location of the sticker database.
-@item @code{port} (default: @code{"6600"})
-The port to run mpd on.
+@item @code{endpoints} (default: @code{(list (mpd-endpoint))})
+The endpoints to bind MPD to. This can be an mpd-endpoint (see below)
+or a list of shepherd endpoints. If using shepherd endpoints, MPD
+will be spawned as a systemd-style service rather than as a
+forkexec-style one. This delays the start of MPD until the first client
+connects.
+
+@item @code{outputs} (default: @code{"(list (mpd-output))"})
+The audio outputs that MPD can use. By default this is a single output using pulseaudio.
+
+@end table
+@end deftp
+
+@deftp {Data Type} mpd-endpoint
+Data type representing the configuration of @command{mpd}.
+
+@table @asis
@item @code{address} (default: @code{"any"})
The address that mpd will bind to. To use a Unix domain socket,
an absolute path can be specified here.
-@item @code{outputs} (default: @code{"(list (mpd-output))"})
-The audio outputs that MPD can use. By default this is a single output using pulseaudio.
+@item @code{port} (default: @code{"6600"})
+The port to run mpd on.
@end table
@end deftp
diff --git a/gnu/services/audio.scm b/gnu/services/audio.scm
index c60053f33c..6e8fd460a1 100644
--- a/gnu/services/audio.scm
+++ b/gnu/services/audio.scm
@@ -20,6 +20,8 @@
(define-module (gnu services audio)
#:use-module (guix gexp)
+ #:use-module (guix diagnostics)
+ #:use-module (guix i18n)
#:use-module (gnu services)
#:use-module (gnu services shepherd)
#:use-module (gnu system shadow)
@@ -28,8 +30,14 @@ (define-module (gnu services audio)
#:use-module (guix records)
#:use-module (ice-9 match)
#:use-module (ice-9 format)
+ #:use-module (srfi srfi-1)
+ #:use-module (srfi srfi-26)
+ #:use-module (srfi srfi-34)
+ #:use-module (srfi srfi-35)
#:export (mpd-output
mpd-output?
+ mpd-endpoint
+ mpd-endpoint?
mpd-configuration
mpd-configuration?
mpd-service-type))
@@ -59,6 +67,30 @@ (define-record-type* <mpd-output>
(extra-options mpd-output-extra-options
(default '())))
+(define-record-type* <mpd-endpoint>
+ mpd-endpoint make-mpd-endpoint
+ mpd-endpoint?
+ (address mpd-endpoint-address (default "any"))
+ (port mpd-endpoint-port (default "6600")))
+
+(define-with-syntax-properties (sanitize-mpd-endpoints (endpoints properties))
+ (match endpoints
+ ((? mpd-endpoint? endpoint) (list endpoint))
+ (((? mpd-endpoint?)) endpoints)
+ (((? mpd-endpoint?) . _)
+ (raise (make-compound-condition
+ (condition (&message
+ (message
+ (G_ "\
+<mpd-endpoint> is mutually exclusive with other endpoints."))))
+ (condition (&error-location
+ (location (source-properties->location properties))))
+ (condition (&fix-hint
+ (hint "\
+Make sure you only need one endpoint or use shepherd endpoints instead."))))))
+ (((? shepherd-endpoint?) . (? (cute every shepherd-endpoint? <>)))
+ endpoints)))
+
(define-record-type* <mpd-configuration>
mpd-configuration make-mpd-configuration
mpd-configuration?
@@ -74,10 +106,9 @@ (define-record-type* <mpd-configuration>
(default "~/.mpd/state"))
(sticker-file mpd-configuration-sticker-file
(default "~/.mpd/sticker.sql"))
- (port mpd-configuration-port
- (default "6600"))
- (address mpd-configuration-address
- (default "any"))
+ (endpoints mpd-configuration-endpoints ; list of <shepherd-endpoint>
+ (default (list (mpd-endpoint))) ; | <mpd-endpoint>
+ (sanitize sanitize-mpd-endpoints))
(outputs mpd-configuration-outputs
(default (list (mpd-output)))))
@@ -124,9 +155,12 @@ (define (mpd-config->file config)
("playlist_directory" ,mpd-configuration-playlist-dir)
("db_file" ,mpd-configuration-db-file)
("state_file" ,mpd-configuration-state-file)
- ("sticker_file" ,mpd-configuration-sticker-file)
- ("port" ,mpd-configuration-port)
- ("bind_to_address" ,mpd-configuration-address))))))
+ ("sticker_file" ,mpd-configuration-sticker-file)))
+ (match (mpd-configuration-endpoints config)
+ (($ <mpd-endpoint> address port)
+ `(("bind_to_address" ,address)
+ ("port" ,port)))
+ (_ '())))))
(define (mpd-file-name config file)
"Return a path in /var/run/mpd/ that is writable
@@ -135,24 +169,48 @@ (define (mpd-file-name config file)
(mpd-configuration-user config)
"/" file))
+(define (mpd-configuration-shepherd-endpoints config)
+ "Return @code{(mpd-configuration-endpoints config)}"
+ (let ((endpoints (mpd-configuration-endpoints config)))
+ (match endpoints
+ (((? shepherd-endpoint?) . _) endpoints)
+ (_ #f))))
+
(define (mpd-shepherd-service config)
(shepherd-service
(documentation "Run the MPD (Music Player Daemon)")
(requirement '(user-processes))
(provision '(mpd))
- (start #~(make-forkexec-constructor
- (list #$(file-append mpd "/bin/mpd")
- "--no-daemon"
- #$(mpd-config->file config))
- #:environment-variables
- ;; Required to detect PulseAudio when run under a user account.
- (list (string-append
- "XDG_RUNTIME_DIR=/run/user/"
- (number->string
- (passwd:uid
- (getpwnam #$(mpd-configuration-user config))))))
- #:log-file #$(mpd-file-name config "log")))
- (stop #~(make-kill-destructor))))
+ (start (if (mpd-configuration-shepherd-endpoints config)
+ #~(make-systemd-constructor
+ (list #$(file-append mpd "/bin/mpd")
+ "--systemd"
+ #$(mpd-config->file config))
+ (list #$@(map shepherd-endpoint->sexp
+ (mpd-configuration-shepherd-endpoints config)))
+ #:environment-variables
+ ;; Required to detect PulseAudio when run under a user account.
+ (list (string-append
+ "XDG_RUNTIME_DIR=/run/user/"
+ (number->string
+ (passwd:uid
+ (getpwnam #$(mpd-configuration-user config))))))
+ #:log-file #$(mpd-file-name config "log"))
+ #~(make-forkexec-constructor
+ (list #$(file-append mpd "/bin/mpd")
+ "--no-daemon"
+ #$(mpd-config->file config))
+ #:environment-variables
+ ;; Required to detect PulseAudio when run under a user account.
+ (list (string-append
+ "XDG_RUNTIME_DIR=/run/user/"
+ (number->string
+ (passwd:uid
+ (getpwnam #$(mpd-configuration-user config))))))
+ #:log-file #$(mpd-file-name config "log"))))
+ (stop (if (mpd-configuration-shepherd-endpoints config)
+ #~(make-systemd-destructor)
+ #~(make-kill-destructor)))))
(define (mpd-service-activation config)
(with-imported-modules '((guix build utils))
--
2.37.3
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Subject: [bug#54986] [PATCH v3 1/2] services: shepherd: Add support for socket activation endpoints.
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Date: Sat, 23 Apr 2022 16:25:55 +0200
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Content preview: * gnu/services/shepherd.scm (<shepherd-endpoint>): New record
type. (shepherd-endpoint->sexp): New variable. * doc/guix.texi (Shepherd
Services): Document it. --- doc/guix.texi | 32 ++++++++++++++++++ [...]
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Content preview: * gnu/services/shepherd.scm (<shepherd-endpoint>): New record
type. (shepherd-endpoint->sexp): New variable. * doc/guix.texi (Shepherd
Services): Document it. --- doc/guix.texi | 32 ++++++++++++++++++ [...]
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* gnu/services/shepherd.scm (<shepherd-endpoint>): New record type.
(shepherd-endpoint->sexp): New variable.
* doc/guix.texi (Shepherd Services): Document it.
---
doc/guix.texi | 32 ++++++++++++++++++++
gnu/services/shepherd.scm | 64 +++++++++++++++++++++++++++++++++++++++
2 files changed, 96 insertions(+)
diff --git a/doc/guix.texi b/doc/guix.texi
index c21235f28d..30cc3b6d45 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -39332,6 +39332,38 @@ This, as you can see, is a fairly sophisticated way to say hello.
info on actions.
@end deftp
+@deftp {Data Type} shepherd-endpoint
+This data type represents an endpoint for inetd-style and systemd-style
+services. Its fields reflect the arguments to shepherd's
+@code{endpoint} procedure.
+
+@table @code
+@item address
+The socket address to bind via shepherd and forward to the service.
+
+@item name
+A ``descriptive'' name to forward to the service along with the socket.
+
+@item style
+The socket style to use.
+@xref{Network Sockets and Communication,,, guile, GNU Guile Reference
+Manual}.
+
+@item backlog
+The maximum length of the queue for pending connections.
+
+@item socket-owner
+The user ID owning the socket.
+
+@item socket-group
+The group ID owning the socket.
+
+@item socket-directory-permissions
+The UNIX permissions to set for the directory the socket resides in.
+
+@end table
+@end deftp
+
@defvr {Scheme Variable} shepherd-root-service-type
The service type for the Shepherd ``root service''---i.e., PID@tie{}1.
diff --git a/gnu/services/shepherd.scm b/gnu/services/shepherd.scm
index 4fd4b2a497..f0d204ff3a 100644
--- a/gnu/services/shepherd.scm
+++ b/gnu/services/shepherd.scm
@@ -66,6 +66,17 @@ (define-module (gnu services shepherd)
shepherd-action-documentation
shepherd-action-procedure
+ shepherd-endpoint
+ shepherd-endpoint?
+ shepherd-endpoint-address
+ shepherd-endpoint-name
+ shepherd-endpoint-style
+ shepherd-endpoint-backlog
+ shepherd-endpoint-socket-owner
+ shepherd-endpoint-socket-group
+ shepherd-endpoint-socket-directory-permissions
+ shepherd-endpoint->sexp
+
%default-modules
shepherd-service-file
@@ -183,6 +194,59 @@ (define %default-modules
((guix build utils) #:hide (delete))
(guix build syscalls)))
+(define-record-type* <shepherd-endpoint>
+ shepherd-endpoint make-shepherd-endpoint
+ shepherd-endpoint?
+ (address shepherd-endpoint-address) ; sockaddr
+ (name shepherd-endpoint-name ; string | #f
+ (default #f))
+ (style shepherd-endpoint-style ; int | #f
+ (default #f))
+ (backlog shepherd-endpoint-backlog ; int | #f
+ (default #f))
+ (socket-owner shepherd-endpoint-socket-owner ; uid | #f
+ (default #f))
+ (socket-group shepherd-endpoint-socket-group ; gid | #f
+ (default #f))
+ (socket-directory-permissions
+ shepherd-endpoint-socket-directory-permissions ; chmod pattern (int) | #f
+ (default #f)))
+
+(define (shepherd-endpoint->sexp endpoint)
+ (match endpoint
+ (($ <shepherd-endpoint> address
+ name style backlog socket-owner socket-group
+ socket-directory-permissions)
+ `(endpoint
+ ,(match (sockaddr:fam address)
+ ((? (cute = <> AF_INET) _)
+ `((@ (guile) make-socket-addr)
+ AF_INET
+ ,(sockaddr:addr address)
+ ,(sockaddr:port address)))
+ ((? (cute = <> AF_INET6) _)
+ `((@ (guile) make-socket-addr)
+ AF_INET6
+ ,(sockaddr:addr address)
+ ,(sockaddr:port address)
+ ,(sockaddr:flowinfo address)
+ ,(sockaddr:scopeid address)))
+ ((? (cute = <> AF_UNIX) _)
+ `((@ (guile) make-socket-addr)
+ AF_UNIX
+ ,(sockaddr:path address))))
+ ,@(fold
+ (match-lambda*
+ (((key value) seed)
+ (if value (cons* key value seed) seed)))
+ '()
+ `((#:name ,name)
+ (#:style ,style)
+ (#:backlog ,backlog)
+ (#:socket-owner ,socket-owner)
+ (#:socket-group ,socket-group)
+ (#:socket-directory-permissions ,socket-directory-permissions)))))))
+
(define-record-type* <shepherd-service>
shepherd-service make-shepherd-service
shepherd-service?
--
2.37.3
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Subject: [bug#54986] [PATCH v3 2/2] services: mpd: Support socket activation.
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Am Samstag, dem 23.04.2022 um 16:39 +0200 schrieb Liliana Marie
Prikler:
> * gnu/services/audio.scm (<mpd-endpoint>): New record.
> (<mpd-configuration>)[port, address]: Removed fields.
> [endpoints]: New field.
> (sanitize-mpd-endpoints, mpd-configuration-shepherd-endpoints): New
> variables.
> (mpd-shepherd-service): Use mpd-configuration-shepherd-endpoints.
> * doc/guix.texi (Music Player Daemon): Document it.
> ---
Bump
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Am Sonntag, dem 23.10.2022 um 13:38 +0200 schrieb Liliana Marie
Prikler:
> Am Samstag, dem 23.04.2022 um 16:39 +0200 schrieb Liliana Marie
> Prikler:
> > * gnu/services/audio.scm (<mpd-endpoint>): New record.
> > (<mpd-configuration>)[port, address]: Removed fields.
> > [endpoints]: New field.
> > (sanitize-mpd-endpoints, mpd-configuration-shepherd-endpoints): New
> > variables.
> > (mpd-shepherd-service): Use mpd-configuration-shepherd-endpoints.
> > * doc/guix.texi (Music Player Daemon): Document it.
> > ---
> Bump
Bumpy bump
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Subject: [bug#54986] [PATCH 0/2] services: mpd: Refactor MPD service
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On 2022-12-07 18:27, Liliana Marie Prikler wrote:
> Note that there is [1], which attempts to make it so that shepherd
> endpoints can be specified in lieu of MPD endpoints. You don't need to
> implement this logic – you are free to do so if you want to – but could
> you make it so that there is an explicit endpoint abstraction that
> would allow for extension later on?
>
> Cheers
>
> [1] https://issues.guix.gnu.org/54986
Hi,
After reading issue #54986, regarding mpd escaping shepherd management,
my guess is that there could be two issues at play here:
* mpd.conf was serialized with pid_file [1]. The safest is
to actually not serialize any unused directives and let MPD decide
based on what's actually present. pid_file should only be set if
MPD is to be launched as a "daemon process". [2]
* But the service definition for MPD is launched with '--no-daemon' option
as seen in [3], which could be triggering a bug in MPD. It's probably worth
testing the combinations of having pid_file set and invoking --no-daemon.
> but could
> you make it so that there is an explicit endpoint abstraction that
> would allow for extension later on?
If I'm understanding correctly what [1] is about, I think this can be
implemented through the 'extend' interface. See how
certbot adds a nginx-server-configuration to a nginx-service-type
through the 'extend' interface. For MPD, this would amount to
appending the 'adresses' field with "adequately formatted" values.
[1]: https://git.savannah.gnu.org/cgit/guix.git/tree/gnu/services/audio.scm?id=1b6172d5f6ca22f0fa02cd1335b1b90e9501b731#n116
[2]: https://mpd.readthedocs.io/en/latest/user.html#starting-and-stopping-mpd
[3]: https://git.savannah.gnu.org/cgit/guix.git/tree/gnu/services/audio.scm?id=1b6172d5f6ca22f0fa02cd1335b1b90e9501b731#n145
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Am Donnerstag, dem 08.12.2022 um 13:11 +0000 schrieb mirai:
> On 2022-12-07 18:27, Liliana Marie Prikler wrote:
> > Note that there is [1], which attempts to make it so that shepherd
> > endpoints can be specified in lieu of MPD endpoints.=C2=A0 You don't
> > need to implement this logic =E2=80=93 you are free to do so if you wan=
t to
> > =E2=80=93 but could you make it so that there is an explicit endpoint
> > abstraction that would allow for extension later on?
> >=20
> > Cheers
> >=20
> > [1] https://issues.guix.gnu.org/54986
>=20
> Hi,
>=20
> After reading issue #54986, regarding mpd escaping shepherd
> management, my guess is that there could be two issues at play here:
>=20
> * mpd.conf was serialized with pid_file [1]. The safest is
> to actually not serialize any unused directives and let MPD decide
> based on what's actually present. pid_file should only be set if
> MPD is to be launched as a "daemon process". [2]
>=20
> * But the service definition for MPD is launched with '--no-daemon'
> option as seen in [3], which could be triggering a bug in MPD. It's
> probably worth testing the combinations of having pid_file set and
> invoking --no-daemon.
Nice catch, but completely unrelated to the issue. In neither case do
we ever spawn MPD as a regular daemon, yet only in the systemd case
does shepherd have a problem with it. That statement was concerning
shepherd's (mis)management of sockets, not MPD.
> > but could you make it so that there is an explicit endpoint
> > abstraction that would allow for extension later on?
>=20
> If I'm understanding correctly what [1] is about, I think this can be
> implemented through the 'extend' interface. See how certbot adds a
> nginx-server-configuration to a nginx-service-type through the
> 'extend' interface. For MPD, this would amount to appending the
> 'adresses' field with "adequately formatted" values.
This doesn't work for #54986, which makes it so that in-file addresses
are ignored in favour of handing over the sockets directly through
shepherd. Looking at [4], it appears the meaning of "port" is closer
to that of a default port, as addresses can have ports in them. But I
would still prefer addresses to be "endpoints", which if they happen to
be a list of strings are taken as MPD addresses and if they happen to
be shepherd endpoints are passed on to the shepherd service.
WDYT?
[4] https://mpd.readthedocs.io/en/stable/user.html#client-connections
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On 2022-12-08 13:35, Liliana Marie Prikler wrote:
> This doesn't work for #54986, which makes it so that in-file addresses
> are ignored in favour of handing over the sockets directly through
> shepherd. Looking at [4], it appears the meaning of "port" is closer
> to that of a default port, as addresses can have ports in them. But I
> would still prefer addresses to be "endpoints", which if they happen to
> be a list of strings are taken as MPD addresses and if they happen to
> be shepherd endpoints are passed on to the shepherd service.
Are you proposing for the 'addresses' field to be a
"maybe-list-of-string-or-shepherd-endpoint"? (more of a xor as they can't
be used simultaneously)
Example:
--8<---------------cut here---------------start------------->8---
;; should fire a error message during guix system reconfigure
(mpd-configuration
(addresses `("[::]:6645"
,(shepherd-endpoint
(address "/var/run/mpd-shepherd-socket")))))
--8<---------------cut here---------------end--------------->8---
I don't think it breaks backward compatibility to introduce this
after #59866 is merged.
The type of field 'addresses' could be changed transparently to something like:
--8<---------------cut here---------------start------------->8---
(define list-of-addresses (list-of (lambda (x) (or (string? x) (shepherd-endpoint? x)))))
--8<---------------cut here---------------end--------------->8---
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