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Subject: bug#36855: guix system switch-generation doesn't
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What I see:
1. edit ~/pzprnode/pzprnode
rob@garp ~/pzprnode$ git diff
diff --git a/pzprnode b/pzprnode
index 612e6a8..d8ef0ea 100755
--- a/pzprnode
+++ b/pzprnode
@@ -190,5 +190,6 @@ const server =3D http.createServer((req, res) =3D> {
});
=20
server.listen(port, hostname, () =3D> {
+ console.log("updated version");
console.log(`Server running at http://${hostname}:${port}/`);
});
2. sudo guix system reconfigure -L ~/garp-config =
~/garp-config/config.scm
3. sudo herd restart pzprnode
4. less /var/log/messages
Jul 30 11:46:57 localhost shepherd[1]: Service pzprnode has been =
stopped.=20
Jul 30 11:46:57 localhost shepherd[1]: Service pzprnode has been =
started.=20
Jul 30 11:46:58 localhost pzprnode[4954]: updated version=20
Jul 30 11:46:58 localhost pzprnode[4954]: Server running at =
http://127.0.0.1:3456/=20
5. sudo guix system list-generations
Generation 151 Jul 30 2019 10:37:06
file name: /var/guix/profiles/system-151-link
canonical file name: =
/gnu/store/jis33accsfpa068aps0a9mrycmjzfm4m-system
label: GNU with Linux-Libre 5.2.1
bootloader: grub
root device: label: "guix-root"
kernel: =
/gnu/store/fp6wsvn10h1is0wkz8l2sbzjmjbzi7vr-linux-libre-5.2.1/bzImage
Generation 152 Jul 30 2019 11:43:13 (current)
file name: /var/guix/profiles/system-152-link
canonical file name: =
/gnu/store/3z3wmaj0399kihqc372y91nzcjxc1myl-system
label: GNU with Linux-Libre 5.2.1
bootloader: grub
root device: label: "guix-root"
kernel: =
/gnu/store/fp6wsvn10h1is0wkz8l2sbzjmjbzi7vr-linux-libre-5.2.1/bzImage
6. sudo guix system switch-generation 151
substitute: updating substitutes from 'https://ci.guix.gnu.org'... =
100.0%
The following derivation will be built:
/gnu/store/qvxbl3gm6406dbbkm8jigmpc8zi42lfw-grub.cfg.drv
building /gnu/store/qvxbl3gm6406dbbkm8jigmpc8zi42lfw-grub.cfg.drv...
switched from generation 152 to 151
7. sudo herd restart pzprnode
8. less /var/log/messages
Jul 30 11:48:02 localhost shepherd[1]: Service pzprnode has been =
stopped.=20
Jul 30 11:48:02 localhost shepherd[1]: Service pzprnode has been =
started.=20
Jul 30 11:48:03 localhost pzprnode[4994]: updated version=20
Jul 30 11:48:03 localhost pzprnode[4994]: Server running at =
http://127.0.0.1:3456/=20
The line with =E2=80=9Cupdated version=E2=80=9D should not be there.
Presumably, this is due to switch-generations not calling =
upgrade-shepherd-services.
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: Robert Vollmert <rob@HIDDEN> Subject: bug#36855: Acknowledgement (guix system switch-generation doesn't) Message-ID: <handler.36855.B.15644808472687.ack <at> debbugs.gnu.org> References: <7BE8190F-A8E9-454E-8F37-FBFE42FBDE10@HIDDEN> X-Gnu-PR-Message: ack 36855 X-Gnu-PR-Package: guix Reply-To: 36855 <at> debbugs.gnu.org Date: Tue, 30 Jul 2019 10:01:01 +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): bug-guix@HIDDEN If you wish to submit further information on this problem, please send it to 36855 <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 36855: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D36855 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
X-Loop: help-debbugs@HIDDEN
Subject: bug#36855: guix system switch-generation doesn't
Resent-From: zerodaysfordays@HIDDEN (Jakob L. Kreuze)
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From: zerodaysfordays@HIDDEN (Jakob L. Kreuze)
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Date: Tue, 30 Jul 2019 12:16:05 -0400
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Vollmert's message of "Tue, 30 Jul 2019 12:00:23 +0200")
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--=-=-=
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Hi Robert,
Robert Vollmert <rob@HIDDEN> writes:
> The line with =E2=80=9Cupdated version=E2=80=9D should not be there.
>
> Presumably, this is due to switch-generations not calling
> upgrade-shepherd-services.
I can confirm that 'switch-to-system-generation', the procedure that
carries out 'guix system switch-generation', neither invokes
'upgrade-shepherd-services' nor runs that system's activation script.
I'd be interested to hear from others who have worked on 'guix system'
as to whether or not it would be a good idea to perform the effectful
parts of a system activation for 'switch-generation'. I haven't yet
pondered upon the implications.
Regards,
Jakob
--=-=-=
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X-Loop: help-debbugs@HIDDEN
Subject: bug#36855: guix system switch-generation doesn't
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From: Robert Vollmert <rob@HIDDEN>
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Could we get some input on this bug?
Maybe I=E2=80=99m misunderstanding something, but it seems that a core =
guix
feature (atomic rollbacks) doesn=E2=80=99t work=E2=80=A6
> On 30. Jul 2019, at 12:00, Robert Vollmert <rob@HIDDEN> wrote:
>=20
> What I see:
>=20
> 1. edit ~/pzprnode/pzprnode
>=20
> rob@garp ~/pzprnode$ git diff
> diff --git a/pzprnode b/pzprnode
> index 612e6a8..d8ef0ea 100755
> --- a/pzprnode
> +++ b/pzprnode
> @@ -190,5 +190,6 @@ const server =3D http.createServer((req, res) =3D> =
{
> });
>=20
> server.listen(port, hostname, () =3D> {
> + console.log("updated version");
> console.log(`Server running at http://${hostname}:${port}/`);
> });
>=20
> 2. sudo guix system reconfigure -L ~/garp-config =
~/garp-config/config.scm
> 3. sudo herd restart pzprnode
> 4. less /var/log/messages
>=20
> Jul 30 11:46:57 localhost shepherd[1]: Service pzprnode has been =
stopped.=20
> Jul 30 11:46:57 localhost shepherd[1]: Service pzprnode has been =
started.=20
> Jul 30 11:46:58 localhost pzprnode[4954]: updated version=20
> Jul 30 11:46:58 localhost pzprnode[4954]: Server running at =
http://127.0.0.1:3456/=20
>=20
> 5. sudo guix system list-generations
>=20
> Generation 151 Jul 30 2019 10:37:06
> file name: /var/guix/profiles/system-151-link
> canonical file name: =
/gnu/store/jis33accsfpa068aps0a9mrycmjzfm4m-system
> label: GNU with Linux-Libre 5.2.1
> bootloader: grub
> root device: label: "guix-root"
> kernel: =
/gnu/store/fp6wsvn10h1is0wkz8l2sbzjmjbzi7vr-linux-libre-5.2.1/bzImage
> Generation 152 Jul 30 2019 11:43:13 (current)
> file name: /var/guix/profiles/system-152-link
> canonical file name: =
/gnu/store/3z3wmaj0399kihqc372y91nzcjxc1myl-system
> label: GNU with Linux-Libre 5.2.1
> bootloader: grub
> root device: label: "guix-root"
> kernel: =
/gnu/store/fp6wsvn10h1is0wkz8l2sbzjmjbzi7vr-linux-libre-5.2.1/bzImage
>=20
> 6. sudo guix system switch-generation 151
>=20
> substitute: updating substitutes from 'https://ci.guix.gnu.org'... =
100.0%
> The following derivation will be built:
> /gnu/store/qvxbl3gm6406dbbkm8jigmpc8zi42lfw-grub.cfg.drv
> building /gnu/store/qvxbl3gm6406dbbkm8jigmpc8zi42lfw-grub.cfg.drv...
> switched from generation 152 to 151
>=20
> 7. sudo herd restart pzprnode
> 8. less /var/log/messages
>=20
> Jul 30 11:48:02 localhost shepherd[1]: Service pzprnode has been =
stopped.=20
> Jul 30 11:48:02 localhost shepherd[1]: Service pzprnode has been =
started.=20
> Jul 30 11:48:03 localhost pzprnode[4994]: updated version=20
> Jul 30 11:48:03 localhost pzprnode[4994]: Server running at =
http://127.0.0.1:3456/=20
>=20
> The line with =E2=80=9Cupdated version=E2=80=9D should not be there.
>=20
> Presumably, this is due to switch-generations not calling =
upgrade-shepherd-services.
>=20
X-Loop: help-debbugs@HIDDEN
Subject: bug#36855: guix system switch-generation doesn't
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Could we get some input on this bug?
Maybe I=E2=80=99m misunderstanding something, but it seems that a core =
guix
feature (atomic rollbacks) doesn=E2=80=99t work=E2=80=A6
> On 30. Jul 2019, at 12:00, Robert Vollmert <rob@HIDDEN> wrote:
>=20
> What I see:
>=20
> 1. edit ~/pzprnode/pzprnode
>=20
> rob@garp ~/pzprnode$ git diff
> diff --git a/pzprnode b/pzprnode
> index 612e6a8..d8ef0ea 100755
> --- a/pzprnode
> +++ b/pzprnode
> @@ -190,5 +190,6 @@ const server =3D http.createServer((req, res) =3D> =
{
> });
>=20
> server.listen(port, hostname, () =3D> {
> + console.log("updated version");
> console.log(`Server running at http://${hostname}:${port}/`);
> });
>=20
> 2. sudo guix system reconfigure -L ~/garp-config =
~/garp-config/config.scm
> 3. sudo herd restart pzprnode
> 4. less /var/log/messages
>=20
> Jul 30 11:46:57 localhost shepherd[1]: Service pzprnode has been =
stopped.=20
> Jul 30 11:46:57 localhost shepherd[1]: Service pzprnode has been =
started.=20
> Jul 30 11:46:58 localhost pzprnode[4954]: updated version=20
> Jul 30 11:46:58 localhost pzprnode[4954]: Server running at =
http://127.0.0.1:3456/=20
>=20
> 5. sudo guix system list-generations
>=20
> Generation 151 Jul 30 2019 10:37:06
> file name: /var/guix/profiles/system-151-link
> canonical file name: =
/gnu/store/jis33accsfpa068aps0a9mrycmjzfm4m-system
> label: GNU with Linux-Libre 5.2.1
> bootloader: grub
> root device: label: "guix-root"
> kernel: =
/gnu/store/fp6wsvn10h1is0wkz8l2sbzjmjbzi7vr-linux-libre-5.2.1/bzImage
> Generation 152 Jul 30 2019 11:43:13 (current)
> file name: /var/guix/profiles/system-152-link
> canonical file name: =
/gnu/store/3z3wmaj0399kihqc372y91nzcjxc1myl-system
> label: GNU with Linux-Libre 5.2.1
> bootloader: grub
> root device: label: "guix-root"
> kernel: =
/gnu/store/fp6wsvn10h1is0wkz8l2sbzjmjbzi7vr-linux-libre-5.2.1/bzImage
>=20
> 6. sudo guix system switch-generation 151
>=20
> substitute: updating substitutes from 'https://ci.guix.gnu.org'... =
100.0%
> The following derivation will be built:
> /gnu/store/qvxbl3gm6406dbbkm8jigmpc8zi42lfw-grub.cfg.drv
> building /gnu/store/qvxbl3gm6406dbbkm8jigmpc8zi42lfw-grub.cfg.drv...
> switched from generation 152 to 151
>=20
> 7. sudo herd restart pzprnode
> 8. less /var/log/messages
>=20
> Jul 30 11:48:02 localhost shepherd[1]: Service pzprnode has been =
stopped.=20
> Jul 30 11:48:02 localhost shepherd[1]: Service pzprnode has been =
started.=20
> Jul 30 11:48:03 localhost pzprnode[4994]: updated version=20
> Jul 30 11:48:03 localhost pzprnode[4994]: Server running at =
http://127.0.0.1:3456/=20
>=20
> The line with =E2=80=9Cupdated version=E2=80=9D should not be there.
>=20
> Presumably, this is due to switch-generations not calling =
upgrade-shepherd-services.
>=20
X-Loop: help-debbugs@HIDDEN
Subject: bug#36855: guix system switch-generation doesn't
Resent-From: Christopher Lemmer Webber <cwebber@HIDDEN>
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Could you look at bug #36878 and commit 1db6f137d... as of latest
master, is this fixed?
Robert Vollmert writes:
> Could we get some input on this bug?
>
> Maybe I=E2=80=99m misunderstanding something, but it seems that a core gu=
ix
> feature (atomic rollbacks) doesn=E2=80=99t work=E2=80=A6
>
>> On 30. Jul 2019, at 12:00, Robert Vollmert <rob@HIDDEN> wrote:
>>=20
>> What I see:
>>=20
>> 1. edit ~/pzprnode/pzprnode
>>=20
>> rob@garp ~/pzprnode$ git diff
>> diff --git a/pzprnode b/pzprnode
>> index 612e6a8..d8ef0ea 100755
>> --- a/pzprnode
>> +++ b/pzprnode
>> @@ -190,5 +190,6 @@ const server =3D http.createServer((req, res) =3D> {
>> });
>>=20
>> server.listen(port, hostname, () =3D> {
>> + console.log("updated version");
>> console.log(`Server running at http://${hostname}:${port}/`);
>> });
>>=20
>> 2. sudo guix system reconfigure -L ~/garp-config ~/garp-config/config.scm
>> 3. sudo herd restart pzprnode
>> 4. less /var/log/messages
>>=20
>> Jul 30 11:46:57 localhost shepherd[1]: Service pzprnode has been stopped=
.=20
>> Jul 30 11:46:57 localhost shepherd[1]: Service pzprnode has been started=
.=20
>> Jul 30 11:46:58 localhost pzprnode[4954]: updated version=20
>> Jul 30 11:46:58 localhost pzprnode[4954]: Server running at http://127.0=
.0.1:3456/=20
>>=20
>> 5. sudo guix system list-generations
>>=20
>> Generation 151 Jul 30 2019 10:37:06
>> file name: /var/guix/profiles/system-151-link
>> canonical file name: /gnu/store/jis33accsfpa068aps0a9mrycmjzfm4m-system
>> label: GNU with Linux-Libre 5.2.1
>> bootloader: grub
>> root device: label: "guix-root"
>> kernel: /gnu/store/fp6wsvn10h1is0wkz8l2sbzjmjbzi7vr-linux-libre-5.2.1/bz=
Image
>> Generation 152 Jul 30 2019 11:43:13 (current)
>> file name: /var/guix/profiles/system-152-link
>> canonical file name: /gnu/store/3z3wmaj0399kihqc372y91nzcjxc1myl-system
>> label: GNU with Linux-Libre 5.2.1
>> bootloader: grub
>> root device: label: "guix-root"
>> kernel: /gnu/store/fp6wsvn10h1is0wkz8l2sbzjmjbzi7vr-linux-libre-5.2.1/bz=
Image
>>=20
>> 6. sudo guix system switch-generation 151
>>=20
>> substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
>> The following derivation will be built:
>> /gnu/store/qvxbl3gm6406dbbkm8jigmpc8zi42lfw-grub.cfg.drv
>> building /gnu/store/qvxbl3gm6406dbbkm8jigmpc8zi42lfw-grub.cfg.drv...
>> switched from generation 152 to 151
>>=20
>> 7. sudo herd restart pzprnode
>> 8. less /var/log/messages
>>=20
>> Jul 30 11:48:02 localhost shepherd[1]: Service pzprnode has been stopped=
.=20
>> Jul 30 11:48:02 localhost shepherd[1]: Service pzprnode has been started=
.=20
>> Jul 30 11:48:03 localhost pzprnode[4994]: updated version=20
>> Jul 30 11:48:03 localhost pzprnode[4994]: Server running at http://127.0=
.0.1:3456/=20
>>=20
>> The line with =E2=80=9Cupdated version=E2=80=9D should not be there.
>>=20
>> Presumably, this is due to switch-generations not calling upgrade-shephe=
rd-services.
>>=20
X-Loop: help-debbugs@HIDDEN
Subject: bug#36855: guix system switch-generation doesn't
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Could you look at bug #36878 and commit 1db6f137d... as of latest
master, is this fixed?
Robert Vollmert writes:
> Could we get some input on this bug?
>
> Maybe I=E2=80=99m misunderstanding something, but it seems that a core gu=
ix
> feature (atomic rollbacks) doesn=E2=80=99t work=E2=80=A6
>
>> On 30. Jul 2019, at 12:00, Robert Vollmert <rob@HIDDEN> wrote:
>>=20
>> What I see:
>>=20
>> 1. edit ~/pzprnode/pzprnode
>>=20
>> rob@garp ~/pzprnode$ git diff
>> diff --git a/pzprnode b/pzprnode
>> index 612e6a8..d8ef0ea 100755
>> --- a/pzprnode
>> +++ b/pzprnode
>> @@ -190,5 +190,6 @@ const server =3D http.createServer((req, res) =3D> {
>> });
>>=20
>> server.listen(port, hostname, () =3D> {
>> + console.log("updated version");
>> console.log(`Server running at http://${hostname}:${port}/`);
>> });
>>=20
>> 2. sudo guix system reconfigure -L ~/garp-config ~/garp-config/config.scm
>> 3. sudo herd restart pzprnode
>> 4. less /var/log/messages
>>=20
>> Jul 30 11:46:57 localhost shepherd[1]: Service pzprnode has been stopped=
.=20
>> Jul 30 11:46:57 localhost shepherd[1]: Service pzprnode has been started=
.=20
>> Jul 30 11:46:58 localhost pzprnode[4954]: updated version=20
>> Jul 30 11:46:58 localhost pzprnode[4954]: Server running at http://127.0=
.0.1:3456/=20
>>=20
>> 5. sudo guix system list-generations
>>=20
>> Generation 151 Jul 30 2019 10:37:06
>> file name: /var/guix/profiles/system-151-link
>> canonical file name: /gnu/store/jis33accsfpa068aps0a9mrycmjzfm4m-system
>> label: GNU with Linux-Libre 5.2.1
>> bootloader: grub
>> root device: label: "guix-root"
>> kernel: /gnu/store/fp6wsvn10h1is0wkz8l2sbzjmjbzi7vr-linux-libre-5.2.1/bz=
Image
>> Generation 152 Jul 30 2019 11:43:13 (current)
>> file name: /var/guix/profiles/system-152-link
>> canonical file name: /gnu/store/3z3wmaj0399kihqc372y91nzcjxc1myl-system
>> label: GNU with Linux-Libre 5.2.1
>> bootloader: grub
>> root device: label: "guix-root"
>> kernel: /gnu/store/fp6wsvn10h1is0wkz8l2sbzjmjbzi7vr-linux-libre-5.2.1/bz=
Image
>>=20
>> 6. sudo guix system switch-generation 151
>>=20
>> substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
>> The following derivation will be built:
>> /gnu/store/qvxbl3gm6406dbbkm8jigmpc8zi42lfw-grub.cfg.drv
>> building /gnu/store/qvxbl3gm6406dbbkm8jigmpc8zi42lfw-grub.cfg.drv...
>> switched from generation 152 to 151
>>=20
>> 7. sudo herd restart pzprnode
>> 8. less /var/log/messages
>>=20
>> Jul 30 11:48:02 localhost shepherd[1]: Service pzprnode has been stopped=
.=20
>> Jul 30 11:48:02 localhost shepherd[1]: Service pzprnode has been started=
.=20
>> Jul 30 11:48:03 localhost pzprnode[4994]: updated version=20
>> Jul 30 11:48:03 localhost pzprnode[4994]: Server running at http://127.0=
.0.1:3456/=20
>>=20
>> The line with =E2=80=9Cupdated version=E2=80=9D should not be there.
>>=20
>> Presumably, this is due to switch-generations not calling upgrade-shephe=
rd-services.
>>=20
X-Loop: help-debbugs@HIDDEN
Subject: bug#36855: guix system switch-generation doesn't
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From: zerodaysfordays@HIDDEN (Jakob L. Kreuze)
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Hi Chris,
Christopher Lemmer Webber <cwebber@HIDDEN> writes:
> Could you look at bug #36878 and commit 1db6f137d... as of latest
> master, is this fixed?
Unfortunately, I don't think that 1db6f137d fixes this. The issue is a
bit more structural as 'switch-to-system-generation' doesn't call out to
'upgrade-shepherd-services'. I'm not sure if this was an intentional
decision or not (perhaps we can ask Ludo when he returns).
Regards,
Jakob
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Subject: bug#36855: guix system switch-generation doesn't
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From: Chris Marusich <cmmarusich@HIDDEN>
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Hi Jakob,
zerodaysfordays@HIDDEN (Jakob L. Kreuze) writes:
> 'switch-to-system-generation' doesn't call out to
> 'upgrade-shepherd-services'. I'm not sure if this was an intentional
> decision or not
It is intentional, but only because there is currently no way to call
upgrade-shepherd-services when switching system generations.
Consider the procedure upgrade-shepherd-services: you must pass it an
<operating-system> record. When you are flipping from one generation to
another, how do you get the <operating-system> record that was used for
the generation you're switching to? Guix doesn't currently store the
operating system configuration file or its <operating-system> record
anywhere, so we can't call upgrade-shepherd-services.
This was discussed in 2016 and we agreed we need to persist some
information to enable us to handle Shepherd services correctly. This is
what Ludo suggested at the time:
https://lists.gnu.org/archive/html/guix-devel/2016-06/msg00173.html
"Maybe we could store in the system output (result of =E2=80=98guix system
build=E2=80=99) an sexp representation of (part of) our <shepherd-service>
records:
(shepherd-service
(provisions (x y z))
(requirements (a b c))
(start-script "/gnu/store/=E2=80=A6-start-foo.scm")
(stop-script "/gnu/store/=E2=80=A6-stop-foo.scm")
=E2=80=A6)
Then =E2=80=98upgrade-shepherd-services=E2=80=99 could start from this simp=
lified
representation instead of using the full-blown <shepherd-service>
objects, and thus could work both when instantiating a new generation
and when rolling back."
Until that happens, you'll always have to reboot to complete the
switch.
FYI, last I checked (about 3 years ago), in NixOS they took a slightly
different approach: instead of storing state describing the previous
system generation and relying on the current system's logic to correctly
parse it and use it to revert the system to a prior configuration, they
just dump everything into a self-contained script that knows how to
update the entire system to one specific configuration. That approach
is nice in some ways because switching generations is dead simple - you
just run the switching script belonging to the generation you want to
switch to - but it also has downsides.
For example, if the target generation is old enough compared to the
current system, then the target generation's old switching script might
not understand how to deal with the current system correctly. Instead,
if you only store the bare minimum of state required to take the right
actions, and you implement the meat of the logic in the current Guix
installation, you are more likely to be able to switch generations even
to very old ones where the world was very different, since the current
Guix can be taught how to deal gracefully with the old world. But it
seems more complicated. It's all about trade-offs.
That said, I've never gone back to implement this. If you want to give
it a try, you're more than welcome to do so!
=2D-=20
Chris
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Subject: bug#36855: guix system switch-generation doesn't
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On 8. Aug 2019, at 18:40, Chris Marusich <cmmarusich@HIDDEN> wrote:
> zerodaysfordays@HIDDEN (Jakob L. Kreuze) writes:
>=20
>> 'switch-to-system-generation' doesn't call out to
>> 'upgrade-shepherd-services'. I'm not sure if this was an intentional
>> decision or not
>=20
> It is intentional, but only because there is currently no way to call
> upgrade-shepherd-services when switching system generations.
How does shepherd work on a non-guix system? Can=E2=80=99t be it be =
configured
like other daemons to read its configuration from a file, e.g. from
/run/current-system/etc/shepherd.conf
and be told via signal to reload its configuration from disk?
=E2=80=A6
(I feel a bit cheated right now. This behaviour makes Guix System =
entirely
unsuitable for server use. It shouldn=E2=80=99t be advertised as =
supporting
transactional upgrades and rollbacks if those require a reboot.)
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Subject: bug#36855: guix system switch-generation doesn't
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From: Chris Marusich <cmmarusich@HIDDEN>
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Hi Robert,
Robert Vollmert <rob@HIDDEN> writes:
> On 8. Aug 2019, at 18:40, Chris Marusich <cmmarusich@HIDDEN> wrote:
>> zerodaysfordays@HIDDEN (Jakob L. Kreuze) writes:
>>=20
>>> 'switch-to-system-generation' doesn't call out to
>>> 'upgrade-shepherd-services'. I'm not sure if this was an intentional
>>> decision or not
>>=20
>> It is intentional, but only because there is currently no way to call
>> upgrade-shepherd-services when switching system generations.
>
> How does shepherd work on a non-guix system? Can=E2=80=99t be it be confi=
gured
> like other daemons to read its configuration from a file, e.g. from
>
> /run/current-system/etc/shepherd.conf
>
> and be told via signal to reload its configuration from disk?
Maybe! In the email thread I linked, Ludo talked about storing a
description of the Shepherd services in the system generation for future
reference. Maybe we could store it in a place like this, and maybe
Shepherd already has mechanisms for reloading configurations like this.
I don't intend to work on this because I need to focus on other things
right now, but I would be happy if someone took up this work!
> (I feel a bit cheated right now. This behaviour makes Guix System entirely
> unsuitable for server use. It shouldn=E2=80=99t be advertised as supporti=
ng
> transactional upgrades and rollbacks if those require a reboot.)
I agree that Guix should update as many Shepherd services as it can when
switching generations. However, I don't think it's inaccurate to say
that Guix supports transactional upgrades and rollbacks. When you
invoke "guix system switch-generation", the system profile symlink is
flipped atomically, so you get an atomic update from one version of the
system to another. Software running in the system never sees an
inconsistent view of the system. Contrast this with nearly any other
mutable GNU/Linux system, in which files are more or less sprayed into
the existing file system with no guarantee of consistency or atomicity.
=2D-=20
Chris
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X-Loop: help-debbugs@HIDDEN
Subject: bug#36855: guix system switch-generation doesn't
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From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
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Hey Chris & Jakob,
Chris Marusich <cmmarusich@HIDDEN> skribis:
> zerodaysfordays@HIDDEN (Jakob L. Kreuze) writes:
>
>> 'switch-to-system-generation' doesn't call out to
>> 'upgrade-shepherd-services'. I'm not sure if this was an intentional
>> decision or not
>
> It is intentional, but only because there is currently no way to call
> upgrade-shepherd-services when switching system generations.
[...]
> FYI, last I checked (about 3 years ago), in NixOS they took a slightly
> different approach: instead of storing state describing the previous
> system generation and relying on the current system's logic to correctly
> parse it and use it to revert the system to a prior configuration, they
> just dump everything into a self-contained script that knows how to
> update the entire system to one specific configuration. That approach
> is nice in some ways because switching generations is dead simple - you
> just run the switching script belonging to the generation you want to
> switch to - but it also has downsides.
Jakob, now that we generate scripts for the effectful bits of system
reconfiguration (one of these bits being service upgrades), couldn=E2=80=99=
t we
take it one step further and store those scripts in the =E2=80=9Csystem=E2=
=80=9D
derivation so we can run them eventually, notably upon
=E2=80=98switch-generation=E2=80=99?
> For example, if the target generation is old enough compared to the
> current system, then the target generation's old switching script might
> not understand how to deal with the current system correctly. Instead,
> if you only store the bare minimum of state required to take the right
> actions, and you implement the meat of the logic in the current Guix
> installation, you are more likely to be able to switch generations even
> to very old ones where the world was very different, since the current
> Guix can be taught how to deal gracefully with the old world. But it
> seems more complicated. It's all about trade-offs.
Indeed. The important thing to me is that from the GRUB menu you can
really switch to any generation. I=E2=80=99ve actually never used
=E2=80=98switch-generations=E2=80=99 on my laptop, but technically, I feel =
like storing
the =E2=80=9Cswitch-to-system=E2=80=9D script would be the easiest way.
Thanks,
Ludo=E2=80=99.
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Subject: bug#36855: guix system switch-generation doesn't
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Hi,
Ludovic Court=C3=A8s <ludo@HIDDEN> writes:
> Jakob, now that we generate scripts for the effectful bits of system
> reconfiguration (one of these bits being service upgrades), couldn=E2=80=
=99t we
> take it one step further and store those scripts in the =E2=80=9Csystem=
=E2=80=9D
> derivation so we can run them eventually, notably upon
> =E2=80=98switch-generation=E2=80=99?
As a bonus, this approach might solve another issue I've observed: on my
Guix system, where I build everything locally, several derivations are
built *during* activation. Based on the terminal output, I get the
impression that the system is compiling things while the system in an
intermediate state, when some of the activation steps have been done,
but not all of them.
As I recall, the derivations built during activation are limited to
compiled modules for Guile, but it still sometimes takes on the order of
a minute or two on my laptop to complete the "activating system" steps.
This seems suboptimal.
The next time I update my system, I'll try to remember to keep a
transcript of this, so that I can be more specific.
Best,
Mark
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Subject: bug#36855: guix system switch-generation doesn't
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Hello again,
Mark H Weaver <mhw@HIDDEN> writes:
> Ludovic Court=C3=A8s <ludo@HIDDEN> writes:
>
>> Jakob, now that we generate scripts for the effectful bits of system
>> reconfiguration (one of these bits being service upgrades), couldn=E2=80=
=99t we
>> take it one step further and store those scripts in the =E2=80=9Csystem=
=E2=80=9D
>> derivation so we can run them eventually, notably upon
>> =E2=80=98switch-generation=E2=80=99?
>
> As a bonus, this approach might solve another issue I've observed: on my
> Guix system, where I build everything locally, several derivations are
> built *during* activation. Based on the terminal output, I get the
> impression that the system is compiling things while the system in an
> intermediate state, when some of the activation steps have been done,
> but not all of them.
>
> As I recall, the derivations built during activation are limited to
> compiled modules for Guile, but it still sometimes takes on the order of
> a minute or two on my laptop to complete the "activating system" steps.
> This seems suboptimal.
>
> The next time I update my system, I'll try to remember to keep a
> transcript of this, so that I can be more specific.
Here's a transcript:
--8<---------------cut here---------------start------------->8---
activating system...
building /gnu/store/fbp6bbxw9cf617fmk57sddrz7zfsfw5p-module-import-compiled=
.drv...
building /gnu/store/wfi6hnr9ggal0s1d32xx5wbl5k5wqlvx-switch-to-system.scm.d=
rv...
making '/gnu/store/mjzk53ia3bajn08lscpyzz5apcw3r70g-system' the current sys=
tem...
setting up setuid programs in '/run/setuid-programs'...
populating /etc from /gnu/store/l7r1has973n26hfqrs6vxbi94xzgh360-etc...
building /gnu/store/h2fqcxv3xx14lkdhyphm3lawkayw7sdl-module-import-compiled=
.drv...
building /gnu/store/dar9smjyxmri6v6cchnmp5mpyiimyx64-install-bootloader.scm=
.drv...
guix system: bootloader successfully installed on '/dev/sda'
building /gnu/store/vkk3h5p799lfpmf6msdhrzlq0wqvk3zq-module-import-compiled=
.drv...
building /gnu/store/hn8sr8p13gg2mf379xawscabckp03fkb-upgrade-shepherd-servi=
ces.scm.drv...
shepherd: Evaluating user expression (let* ((services (map primitive-load (=
?))) # ?) ?).
guix system: warning: only 3.9% of free space available on /gnu/store
hint: Consider deleting old profile generations and collecting garbage, alo=
ng these lines:
guix gc --delete-generations=3D1m
--8<---------------cut here---------------end--------------->8---
Mark
X-Loop: help-debbugs@HIDDEN
Subject: bug#36855: guix system switch-generation doesn't
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Date: Wed, 28 Aug 2019 14:28:39 -0400
In-Reply-To: <874l241bq6.fsf@HIDDEN> ("Ludovic
\=\?utf-8\?Q\?Court\=C3\=A8s\=22'\?\=
\=\?utf-8\?Q\?s\?\= message of "Mon, 26 Aug 2019 12:07:29 +0200")
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--=-=-=
Content-Type: text/plain; charset=utf-8
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Hi Ludo,
Ludovic Court=C3=A8s <ludo@HIDDEN> writes:
> Jakob, now that we generate scripts for the effectful bits of system
> reconfiguration (one of these bits being service upgrades), couldn=E2=80=
=99t
> we take it one step further and store those scripts in the =E2=80=9Csyste=
m=E2=80=9D
> derivation so we can run them eventually, notably upon
> =E2=80=98switch-generation=E2=80=99?
We'd need to find a way of serializing at least the relationships
between services, but I think it's possible (albeit quite involved). I
do really like the idea, though. That way, the system generation would
fully encompass the desired state of the system.
Regards,
Jakob
--=-=-=
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X-Loop: help-debbugs@HIDDEN
Subject: bug#36855: guix system switch-generation doesn't
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Aug 2019 20:34:10 -0400")
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--=-=-=
Content-Type: text/plain
Hi Mark,
Mark H Weaver <mhw@HIDDEN> writes:
> Hello again,
>
> Mark H Weaver <mhw@HIDDEN> writes:
>
>> As a bonus, this approach might solve another issue I've observed: on my
>> Guix system, where I build everything locally, several derivations are
>> built *during* activation. Based on the terminal output, I get the
>> impression that the system is compiling things while the system in an
>> intermediate state, when some of the activation steps have been done,
>> but not all of them.
>>
>> As I recall, the derivations built during activation are limited to
>> compiled modules for Guile, but it still sometimes takes on the order of
>> a minute or two on my laptop to complete the "activating system" steps.
>> This seems suboptimal.
>>
>> The next time I update my system, I'll try to remember to keep a
>> transcript of this, so that I can be more specific.
>
> Here's a transcript:
>
> activating system...
> building /gnu/store/fbp6bbxw9cf617fmk57sddrz7zfsfw5p-module-import-compiled.drv...
> building /gnu/store/wfi6hnr9ggal0s1d32xx5wbl5k5wqlvx-switch-to-system.scm.drv...
> making '/gnu/store/mjzk53ia3bajn08lscpyzz5apcw3r70g-system' the current system...
> setting up setuid programs in '/run/setuid-programs'...
> populating /etc from /gnu/store/l7r1has973n26hfqrs6vxbi94xzgh360-etc...
> building /gnu/store/h2fqcxv3xx14lkdhyphm3lawkayw7sdl-module-import-compiled.drv...
> building /gnu/store/dar9smjyxmri6v6cchnmp5mpyiimyx64-install-bootloader.scm.drv...
> guix system: bootloader successfully installed on '/dev/sda'
> building /gnu/store/vkk3h5p799lfpmf6msdhrzlq0wqvk3zq-module-import-compiled.drv...
> building /gnu/store/hn8sr8p13gg2mf379xawscabckp03fkb-upgrade-shepherd-services.scm.drv...
> shepherd: Evaluating user expression (let* ((services (map primitive-load (?))) # ?) ?).
> guix system: warning: only 3.9% of free space available on /gnu/store
> hint: Consider deleting old profile generations and collecting garbage, along these lines:
>
> guix gc --delete-generations=1m
>
> Mark
Thanks for the input; I wasn't aware that the activation process was
taking so long for some people. One of Ludovic's suggestions was to
create a single derivation, rather than three, to speed up system
activation. I'll look into this further.
Regards,
Jakob
--=-=-=
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Subject: bug#36855: guix system switch-generation doesn't
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(Jakob L. Kreuze's message of "Wed, 28 Aug 2019 14:33:18 -0400")
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Hi Jakob,
zerodaysfordays@HIDDEN (Jakob L. Kreuze) writes:
> Thanks for the input; I wasn't aware that the activation process was
> taking so long for some people. One of Ludovic's suggestions was to
> create a single derivation, rather than three, to speed up system
> activation. I'll look into this further.
To be clear, I don't care how long it takes to build these derivations.
However, I think they should all be built before starting to activate
the system. Does that make sense?
On a side note, what would happen if one of those builds failed? Would
the system activation be left half-done?
Thanks,
Mark
X-Loop: help-debbugs@HIDDEN
Subject: bug#36855: guix system switch-generation doesn't
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From: zerodaysfordays@HIDDEN (Jakob L. Kreuze)
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Date: Wed, 28 Aug 2019 20:08:19 -0400
In-Reply-To: <875zmhm8jo.fsf@HIDDEN> (Mark H. Weaver's message of "Wed, 28
Aug 2019 14:46:56 -0400")
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Hi Mark,
Mark H Weaver <mhw@HIDDEN> writes:
> Hi Jakob,
>
> zerodaysfordays@HIDDEN (Jakob L. Kreuze) writes:
>
>> Thanks for the input; I wasn't aware that the activation process was
>> taking so long for some people. One of Ludovic's suggestions was to
>> create a single derivation, rather than three, to speed up system
>> activation. I'll look into this further.
>
> To be clear, I don't care how long it takes to build these
> derivations. However, I think they should all be built before starting
> to activate the system. Does that make sense?
Yes, and I agree that it would be ideal to have the derivations built
prior to system activation -- that way, the activation scripts could be
included in 'show-what-to-build*'.
> On a side note, what would happen if one of those builds failed? Would
> the system activation be left half-done?
Yes. You raise another very good reason for why system activation should
be carried out by a single, atomic activation script :)
Regards,
Jakob
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