bug#33647: First `guix pull' behaves unexpectedly

bug#33647: First `guix pull' behaves unexpectedly

[Diego Nicola Barbato]

Hello Guix,

The first time a user runs ‘guix pull’ after a fresh install it does not
seem to update guix.  ‘guix --version’ reports that guix is still
version 0.15.0 after running ‘guix pull’, instead of showing the hash of
the latest commit.
This can be mitigated by logging out and back in, after which
‘guix --version’ returns the expected version.

Greetings

Diego

bug#33647: First `guix pull' behaves unexpectedly

[Ricardo Wurmus]

Hi Diego,

> Hello Guix,
>
> The first time a user runs ‘guix pull’ after a fresh install it does not
> seem to update guix.  ‘guix --version’ reports that guix is still
> version 0.15.0 after running ‘guix pull’, instead of showing the hash of
> the latest commit.

“guix pull” should have reminded you to add ~/.config/guix/current/bin
to the front of your PATH environment variable.  When you do that you
will be using the new version of Guix.

-- 
Ricardo

bug#33647: First `guix pull' behaves unexpectedly

[Diego Nicola Barbato]

Hello Ricardo,

Thank you for the prompt reply.

Ricardo Wurmus <rekado@elephly.net> writes:

> Hi Diego,
>
>> Hello Guix,
>>
>> The first time a user runs ‘guix pull’ after a fresh install it does not
>> seem to update guix.  ‘guix --version’ reports that guix is still
>> version 0.15.0 after running ‘guix pull’, instead of showing the hash of
>> the latest commit.
>
> “guix pull” should have reminded you to add ~/.config/guix/current/bin
> to the front of your PATH environment variable.

I just checked the output and there was nothing after
“1 package in profile”, which is where the
“The following environment variable definitions may be needed:” lines
are usually printed.  If ‘guix pull’ is indeed supposed to print a
reminder this is probably the bug.

Greetings

Diego

bug#33647: First `guix pull' behaves unexpectedly

[Ludovic Courtès]

Hello,

Ricardo Wurmus <rekado@elephly.net> skribis:

>> Hello Guix,
>>
>> The first time a user runs ‘guix pull’ after a fresh install it does not
>> seem to update guix.  ‘guix --version’ reports that guix is still
>> version 0.15.0 after running ‘guix pull’, instead of showing the hash of
>> the latest commit.
>
> “guix pull” should have reminded you to add ~/.config/guix/current/bin
> to the front of your PATH environment variable.  When you do that you
> will be using the new version of Guix.

In addition, be aware that Bash maintains a cache of commands it looked
up in $PATH.  Thus it may be that, say, it had cached that ‘guix’ is
really /run/current-system/profile/bin/guix.  When you pulled, it didn’t
invalidate its cache thus you kept using that old version.

The solution is to run “hash guix” at the Bash prompt to force cache
invalidation (info "(bash) Bourne Shell Builtins").

HTH!

Ludo’.

bug#33647: First `guix pull' behaves unexpectedly

[Diego Nicola Barbato]

Hello,

Ludovic Courtès <ludo@gnu.org> writes:

> Hello,
>
> Ricardo Wurmus <rekado@elephly.net> skribis:
>
>>> Hello Guix,
>>>
>>> The first time a user runs ‘guix pull’ after a fresh install it does not
>>> seem to update guix.  ‘guix --version’ reports that guix is still
>>> version 0.15.0 after running ‘guix pull’, instead of showing the hash of
>>> the latest commit.
>>
>> “guix pull” should have reminded you to add ~/.config/guix/current/bin
>> to the front of your PATH environment variable.  When you do that you
>> will be using the new version of Guix.

I forgot to mention that this is on GuixSD, where
~/.config/guix/currend/bin is already in PATH, which maybe explains why
I did not get a reminder.

> In addition, be aware that Bash maintains a cache of commands it looked
> up in $PATH.  Thus it may be that, say, it had cached that ‘guix’ is
> really /run/current-system/profile/bin/guix.  When you pulled, it didn’t
> invalidate its cache thus you kept using that old version.
>
> The solution is to run “hash guix” at the Bash prompt to force cache
> invalidation (info "(bash) Bourne Shell Builtins").

I believe this is it.  This also explains why ‘which guix’ returned the
updated guix while ‘guix --version’ claimed it was still the older
version, which I found rather confusing.
I am afraid being unaware of this has led me to inadvertently downgrade
GuixSD whenever I reconfigured for the first time after a fresh install.

Thanks!

Diego

bug#33647: First `guix pull' behaves unexpectedly

[Björn Höfling]

[-- Attachment #1: Type: text/plain, Size: 486 bytes --]

On Fri, 07 Dec 2018 09:36:31 +0100
Diego Nicola Barbato <dnbarbato@posteo.de> wrote:

> I believe this is it.  This also explains why ‘which guix’ returned
> the updated guix while ‘guix --version’ claimed it was still the older
> version, which I found rather confusing.
> I am afraid being unaware of this has led me to inadvertently
> downgrade GuixSD whenever I reconfigured for the first time after a
> fresh install.

OK, then I'm closing this issue.

Björn

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bug#33647: First `guix pull' behaves unexpectedly

[Ludovic Courtès]

Hi,

Diego Nicola Barbato <dnbarbato@posteo.de> skribis:

> Ludovic Courtès <ludo@gnu.org> writes:

[...]

>> In addition, be aware that Bash maintains a cache of commands it looked
>> up in $PATH.  Thus it may be that, say, it had cached that ‘guix’ is
>> really /run/current-system/profile/bin/guix.  When you pulled, it didn’t
>> invalidate its cache thus you kept using that old version.
>>
>> The solution is to run “hash guix” at the Bash prompt to force cache
>> invalidation (info "(bash) Bourne Shell Builtins").
>
> I believe this is it.  This also explains why ‘which guix’ returned the
> updated guix while ‘guix --version’ claimed it was still the older
> version, which I found rather confusing.
> I am afraid being unaware of this has led me to inadvertently downgrade
> GuixSD whenever I reconfigured for the first time after a fresh install.

Yeah.  This is not strictly speaking a Guix bug, but clearly it’s a
common pitfall.  Perhaps we should print a hint upon completion?

Ludo’.

bug#33647: First `guix pull' behaves unexpectedly

[Diego Nicola Barbato]

Hello,

Ludovic Courtès <ludo@gnu.org> writes:

> Diego Nicola Barbato <dnbarbato@posteo.de> skribis:
>
>> Ludovic Courtès <ludo@gnu.org> writes:
>
> [...]
>
>>> In addition, be aware that Bash maintains a cache of commands it looked
>>> up in $PATH.  Thus it may be that, say, it had cached that ‘guix’ is
>>> really /run/current-system/profile/bin/guix.  When you pulled, it didn’t
>>> invalidate its cache thus you kept using that old version.
>>>
>>> The solution is to run “hash guix” at the Bash prompt to force cache
>>> invalidation (info "(bash) Bourne Shell Builtins").
>>
>> I believe this is it.  This also explains why ‘which guix’ returned the
>> updated guix while ‘guix --version’ claimed it was still the older
>> version, which I found rather confusing.
>> I am afraid being unaware of this has led me to inadvertently downgrade
>> GuixSD whenever I reconfigured for the first time after a fresh install.
>
> Yeah.  This is not strictly speaking a Guix bug, but clearly it’s a
> common pitfall.  Perhaps we should print a hint upon completion?

While I think it would be nice for Guix (or strictly speaking Bash) to
just do what a noob like me would expect it to do in this situation, a
hint would have certainly saved me some trouble.  If it is unreasonably
cumbersome to make Guix tell Bash to invalidate its cache upon
completion of ‘guix pull’, I believe a hint would be good enough.

Greetings,

Diego

bug#33647: First `guix pull' behaves unexpectedly

[swedebugia]

On 2018-12-19 13:49, Diego Nicola Barbato wrote:
> Hello,
> 
> Ludovic Courtès <ludo@gnu.org> writes:
> 
>> Diego Nicola Barbato <dnbarbato@posteo.de> skribis:
>>
>>> Ludovic Courtès <ludo@gnu.org> writes:
>>
>> [...]
>>
>>>> In addition, be aware that Bash maintains a cache of commands it looked
>>>> up in $PATH.  Thus it may be that, say, it had cached that ‘guix’ is
>>>> really /run/current-system/profile/bin/guix.  When you pulled, it didn’t
>>>> invalidate its cache thus you kept using that old version.
>>>>
>>>> The solution is to run “hash guix” at the Bash prompt to force cache
>>>> invalidation (info "(bash) Bourne Shell Builtins").
>>>
>>> I believe this is it.  This also explains why ‘which guix’ returned the
>>> updated guix while ‘guix --version’ claimed it was still the older
>>> version, which I found rather confusing.
>>> I am afraid being unaware of this has led me to inadvertently downgrade
>>> GuixSD whenever I reconfigured for the first time after a fresh install.
>>
>> Yeah.  This is not strictly speaking a Guix bug, but clearly it’s a
>> common pitfall.  Perhaps we should print a hint upon completion?
> 
> While I think it would be nice for Guix (or strictly speaking Bash) to
> just do what a noob like me would expect it to do in this situation, a
> hint would have certainly saved me some trouble.  If it is unreasonably
> cumbersome to make Guix tell Bash to invalidate its cache upon
> completion of ‘guix pull’, I believe a hint would be good enough.

I wholeheartedly agree with Diego.

Either we fix it (preferably, even if we have to patch bash in order to 
archive what we want) or we tell the users what to do (this is bad 
because we already tell the users a lot of env variables and this just 
adds clutter and one more cumbersome thing to remember).

FWW I just ran "hash pacman" on parabola and the result was this:
egil@parabola:~$ time hash pacman

real	0m0,000s
user	0m0,000s
sys	0m0,000s

So it won't and any measuable overhead to just call this in the end of 
guix package after updating the symlinks to the new profile generation.

-- 
Cheers Swedebugia

bug#33647: First `guix pull' behaves unexpectedly

[Tobias Geerinckx-Rice]

swedebugia wrote:
> egil@parabola:~$ time hash pacman
>
> real	0m0,000s
> user	0m0,000s
> sys	0m0,000s
>
> So it won't and any measuable overhead to just call this in the 
> end of
> guix package after updating the symlinks to the new profile
> generation.

Do you mean to put something like

  guix() {
    command "$1" "$@"
    hash "$1"
  }

in the default /etc/profile (or wherever such things belong)?

I think this is far too intrusive and magical to do by default, 
considering its limited one-time-only usefulness.  The same goes 
for patching shells.

Kind regards,

T G-R

bug#33647: First `guix pull' behaves unexpectedly

[swedebugia]

On 2018-12-19 20:27, Tobias Geerinckx-Rice wrote:
> swedebugia wrote:
>> egil@parabola:~$ time hash pacman
>>
>> real    0m0,000s
>> user    0m0,000s
>> sys    0m0,000s
>>
>> So it won't and any measuable overhead to just call this in the end of
>> guix package after updating the symlinks to the new profile
>> generation.
> 
> Do you mean to put something like
> 
>   guix() {
>     command "$1" "$@"
>     hash "$1"
>   }
> 
> in the default /etc/profile (or wherever such things belong)?
> 
> I think this is far too intrusive and magical to do by default, 
> considering its limited one-time-only usefulness.  The same goes for 
> patching shells.

That sounds like it could work even though it look like an ugly hack. :)

-- 
Cheers Swedebugia

bug#33647: First `guix pull' behaves unexpectedly

[Ludovic Courtès]

Hi Diego,

Diego Nicola Barbato <dnbarbato@posteo.de> skribis:

> Ludovic Courtès <ludo@gnu.org> writes:
>
>> Diego Nicola Barbato <dnbarbato@posteo.de> skribis:
>>
>>> Ludovic Courtès <ludo@gnu.org> writes:
>>
>> [...]
>>
>>>> In addition, be aware that Bash maintains a cache of commands it looked
>>>> up in $PATH.  Thus it may be that, say, it had cached that ‘guix’ is
>>>> really /run/current-system/profile/bin/guix.  When you pulled, it didn’t
>>>> invalidate its cache thus you kept using that old version.
>>>>
>>>> The solution is to run “hash guix” at the Bash prompt to force cache
>>>> invalidation (info "(bash) Bourne Shell Builtins").
>>>
>>> I believe this is it.  This also explains why ‘which guix’ returned the
>>> updated guix while ‘guix --version’ claimed it was still the older
>>> version, which I found rather confusing.
>>> I am afraid being unaware of this has led me to inadvertently downgrade
>>> GuixSD whenever I reconfigured for the first time after a fresh install.
>>
>> Yeah.  This is not strictly speaking a Guix bug, but clearly it’s a
>> common pitfall.  Perhaps we should print a hint upon completion?
>
> While I think it would be nice for Guix (or strictly speaking Bash) to
> just do what a noob like me would expect it to do in this situation, a
> hint would have certainly saved me some trouble.  If it is unreasonably
> cumbersome to make Guix tell Bash to invalidate its cache upon
> completion of ‘guix pull’, I believe a hint would be good enough.

Thanks for the heads-up.  Commit
3bbd6919bd84b76686d1aa626ba861faf3fc8ceb changes ‘guix pull’ to display
a hint in this case.

Ludo’.

bug#33647: First `guix pull' behaves unexpectedly

[Diego Nicola Barbato]

[-- Attachment #1: Type: text/plain, Size: 606 bytes --]

Hello Ludo,

Sorry to bother you with this again.

Ludovic Courtès <ludo@gnu.org> writes:


[...]


>
> Thanks for the heads-up.  Commit
> 3bbd6919bd84b76686d1aa626ba861faf3fc8ceb changes ‘guix pull’ to display
> a hint in this case.
>
> Ludo’.

I just tried to check if this worked.  I installed GuixSD in a VM (with
the 0.16.0 installer), rebooted, and ran ‘guix pull’
(commit d1dfcc7c1b38d816dddc2868917ba490db7e7c3b).  It did not print any
hint (I have attached the bash session).
Will this change only take effect once the installer is updated?

Regards,

Diego


[-- Attachment #2: Bash session --]
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bob@antelope ~$ which guix
/run/current-system/profile/bin/guix
bob@antelope ~$ guix --version
guix (GNU Guix) 0.16.0
Copyright (C) 2018 the Guix authors
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
bob@antelope ~$ guix pull
Migrating profile generations to '/var/guix/profiles/per-user/bob'...
Updating channel 'guix' from Git repository at 'https://git.savannah.gnu.org/git/guix.git'...
Building from this channel:
  guix      https://git.savannah.gnu.org/git/guix.git   d1dfcc7
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The following derivations will be built:
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1 package in profile
bob@antelope ~$ which guix
/home/bob/.config/guix/current/bin/guix
bob@antelope ~$ guix --version
guix (GNU Guix) 0.16.0
Copyright (C) 2018 the Guix authors
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
bob@antelope ~$ $(which guix) --version
guix (GNU Guix) d1dfcc7c1b38d816dddc2868917ba490db7e7c3b
Copyright (C) 2019 the Guix authors
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
bob@antelope ~$ 

bug#33647: First `guix pull' behaves unexpectedly

[Ludovic Courtès]

Hi Diego,

Diego Nicola Barbato <dnbarbato@posteo.de> skribis:

>> Thanks for the heads-up.  Commit
>> 3bbd6919bd84b76686d1aa626ba861faf3fc8ceb changes ‘guix pull’ to display
>> a hint in this case.
>>
>> Ludo’.
>
> I just tried to check if this worked.  I installed GuixSD in a VM (with
> the 0.16.0 installer), rebooted, and ran ‘guix pull’
> (commit d1dfcc7c1b38d816dddc2868917ba490db7e7c3b).  It did not print any
> hint (I have attached the bash session).
> Will this change only take effect once the installer is updated?

Yes, since the change is in ‘guix pull’ itself, the 0.16.0 ‘guix pull’
won’t display the message.  So you’d have to run the ‘guix pull’ you
just obtained from ‘guix pull’ (ah!) to see the message.

HTH,
Ludo’.