Re: pulling from my personal channel only - is this possible ?

[Andreas Reuleaux]

OK, once more: I am beginning to understand your idea:

you are fixing the guix core channel to a specific commit:
"9edb3f66fd807b096b48283debdcddccfea34bad" here, i.e. from
Saturday, Aug 28 2021

However when I use this (with my own channel):
with or without the channel-with-substitutes-available part
(here shorter: without):


--8<---------------cut here---------------start------------->8---
(list
  (channel
    (name 'guix)
    (url "https://git.savannah.gnu.org/git/guix.git";)
    ;; (branch "master")
    ;; commit as of Sat Aug 28 2021
    (commit "a8dd285d5a0670abf124a721e6ba94da045b24ba")
    (introduction
     (make-channel-introduction
     "9edb3f66fd807b096b48283debdcddccfea34bad"
     (openpgp-fingerprint
     "BBB0 2DDF 2CEA F6A8 0D1D  E643 A2A0 6DF2 A33A 54FA"))))
  (channel
    (name 'my-stuff)
    (url "git://git.a-rx.info/channel")
    (introduction
     (make-channel-introduction
      "2526d032addf793521b9f717d411662db5166288"
      (openpgp-fingerprint
       "99BB E77D 73AE 07B9 D4B0  CA2E 3384 11E5 6E09 31B5")
      ))
    )
  )
--8<---------------cut here---------------end--------------->8---

Then if I pull repeatedly: it always takes around 51s / 52s / 53s:


--8<---------------cut here---------------start------------->8---
rx@dell ~/.config/guix$ time guix pull
Updating channel 'guix' from Git repository at 
'https://git.savannah.gnu.org/git/guix.git'...
Updating channel 'my-stuff' from Git repository at 
'git://git.a-rx.info/channel'...
Building from these channels:
  my-stuff  git://git.a-rx.info/channel 2526d03
  guix      https://git.savannah.gnu.org/git/guix.git   a8dd285
Computing Guix derivation for 'x86_64-linux'... /
nothing to be done


real    0m51.820s
user    1m7.150s
sys     0m0.528s
rx@dell ~/.config/guix$
--8<---------------cut here---------------end--------------->8---


--8<---------------cut here---------------start------------->8---
rx@dell ~/.config/guix$ time guix pull
Updating channel 'guix' from Git repository at 
'https://git.savannah.gnu.org/git/guix.git'...
Updating channel 'my-stuff' from Git repository at 
'git://git.a-rx.info/channel'...
Building from these channels:
  my-stuff  git://git.a-rx.info/channel 2526d03
  guix      https://git.savannah.gnu.org/git/guix.git   a8dd285
Computing Guix derivation for 'x86_64-linux'... /
nothing to be done


real    0m50.882s
user    1m6.199s
sys     0m0.486s
rx@dell ~/.config/guix$
--8<---------------cut here---------------end--------------->8---

and so on.


Maybe it is not the pulling itself that is so expensive, but
"Computing the Guix derivation..." (that is part of the pull command as
well apparently) ?

Is it necessary to always have a complete Guix derivation built,
when I just want to update my system with some changes of my own?

Summary line: I guess I am beginning to understand your idea, but it practice it
does not make a difference, as each pull still takes more then 50sec.


Is there anyone else (pulling frequently) annoyed by these 53 sec
roughly each time ?


-Andreas




Andreas Reuleaux <rx@a-rx.info> writes:

> Simon,
>
> well thanks as well, but sorry:
>
> Neither do I understand this: it still has a guix core channel [?]: 
>
>
>>  (channel
>>   (name 'guix)
>>   (url "https://git.savannah.gnu.org/git/guix.git";)
>>   ;; (branch "master")
>>  ...
>
> (which I wanted to avoid - as it takes ~ 53s), nor does it work
> for me (there may be issues with the finterprint/commit ids
> I don't want to dig any deeper here):
>
> rx@dell ~/.config/guix$ guix pull
> Updating channel 'guix' from Git repository at 
> 'https://git.savannah.gnu.org/git/guix.git'...
> guix pull: error: aborting update of channel 'guix' to commit 
> a8dd285d5a0670abf124a721e6ba94da045b24ba, which is not a descendant of 
> 95c29d2746943733cbe8df7013854d45bb0df413
> hint: Use `--allow-downgrades' to force this downgrade.
>
> rx@dell ~/.config/guix$ guix pull --allow-downgrades
> Updating channel 'guix' from Git repository at 
> 'https://git.savannah.gnu.org/git/guix.git'...
> guix pull: warning: rolling back channel 'guix' from 
> 95c29d2746943733cbe8df7013854d45bb0df413 to 
> a8dd285d5a0670abf124a721e6ba94da045b24ba
> Updating channel 'hacks' from Git repository at 
> 'http://example.com/hacks.git'...
> guix pull: error: Git error: unexpected http status code: 404
> rx@dell ~/.config/guix$
>
>
> I replying to the list, even thought I have received your mail only
> privately.
>
> Thanks in any case.
>   -A
>
>
> Simon Streit <lists@netpanic.org> writes:
>
>> Hi Andreas,
>>
>> Andreas Reuleaux <rx@a-rx.info> writes:
>>> While working on those packages, I often do a
>>>
>>> guix pull
>>
>> Hey, do you just want to pull, say, from your own channel, but not Guix'
>> default?  This is something I just figured out a couple of days ago!
>>
>> One way, and this is only one possibility, is to modify your
>> channels.scm in such a way that you directly pin your channels to the
>> commit, or if necessary, a branch, and basically pull whatever you want
>> to get your newest fix.
>>
>> This is how my channels.scm more or less looks like at the moment:
>>
>> (use-modules (guix ci))
>> (list (channel-with-substitutes-available
>>        %default-guix-channel
>>        "https://ci.guix.gnu.org";))
>> (list
>>  (channel
>>   (name 'guix)
>>   (url "https://git.savannah.gnu.org/git/guix.git";)
>>   ;; (branch "master")
>>   (commit "a8dd285d5a0670abf124a721e6ba94da045b24ba")
>>   (introduction
>>    (make-channel-introduction
>>     "9edb3f66fd807b096b48283debdcddccfea34bad"
>>     (openpgp-fingerprint
>>      "BBB0 2DDF 2CEA F6A8 0D1D  E643 A2A0 6DF2 A33A 54FA"))))
>>  (channel
>>   (name 'hacks)
>>   (url "http://example.com/hacks.git";)
>>   (branch "master")
>>   (commit "e3fd7d9e4aa541f63133c4678f316b5239364c34")))
>>
>> Be aware, that the downside is that anytime you want to go further, you
>> have to comment things out again, or go back to the default definition. 
>>
>>
>> Kind regards
>> Simon