GNU bug report logs - #32789
Bash finds old version of guix after guix pull

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Alex Branham <alex.branham <at> gmail.com>
To: bug-guix <at> gnu.org
Subject: Bash finds old version of guix after guix pull
Date: Thu, 20 Sep 2018 16:49:41 -0500

Hello,

After installing guixsd (0.15) on a VM and doing "guix pull", "guix --version"
gives 0.14-<stuff>.

I asked about this on IRC a few weeks ago and got a helpful answer. All
I needed to do to fix is was to run a simple bash command.
Unfortunately, I've forgotten what that was :-(

Reporting here since I didn't find anything in the issue tracker when I
looked.

Thanks,
Alex

Message #8 received at 32789 <at> debbugs.gnu.org (full text, mbox):

From: Tobias Geerinckx-Rice <me <at> tobias.gr>
To: Alex Branham <alex.branham <at> gmail.com>
Cc: 32789 <at> debbugs.gnu.org
Subject: Re: bug#32789: Bash finds old version of guix after guix pull
Date: Fri, 21 Sep 2018 10:05:28 +0200

Alex,

Alex Branham wrote:
> After installing guixsd (0.15) on a VM and doing "guix pull", 
> "guix --version"
> gives 0.14-<stuff>.
>
> I asked about this on IRC a few weeks ago and got a helpful 
> answer. All
> I needed to do to fix is was to run a simple bash command.
> Unfortunately, I've forgotten what that was :-(

Was it

 $ set +h

?

Kind regards,

T G-R

Message #11 received at 32789 <at> debbugs.gnu.org (full text, mbox):

From: Ricardo Wurmus <rekado <at> elephly.net>
To: Alex Branham <alex.branham <at> gmail.com>
Cc: 32789 <at> debbugs.gnu.org
Subject: Re: bug#32789: Bash finds old version of guix after guix pull
Date: Fri, 21 Sep 2018 16:58:58 +0200

Hi Alex,

> After installing guixsd (0.15) on a VM and doing "guix pull", "guix --version"
> gives 0.14-<stuff>.
>
> I asked about this on IRC a few weeks ago and got a helpful answer. All
> I needed to do to fix is was to run a simple bash command.
> Unfortunately, I've forgotten what that was :-(

I think you mean “hash -r” to make bash forget previously remembered
locations.

--
Ricardo

Message #14 received at 32789 <at> debbugs.gnu.org (full text, mbox):

From: Alex Branham <alex.branham <at> gmail.com>
To: Ricardo Wurmus <rekado <at> elephly.net>
Cc: 32789 <at> debbugs.gnu.org
Subject: Re: bug#32789: Bash finds old version of guix after guix pull
Date: Fri, 21 Sep 2018 10:01:42 -0500

On Fri 21 Sep 2018 at 09:58, Ricardo Wurmus <rekado <at> elephly.net> wrote:

> Hi Alex,
>
>> After installing guixsd (0.15) on a VM and doing "guix pull", "guix --version"
>> gives 0.14-<stuff>.
>>
>> I asked about this on IRC a few weeks ago and got a helpful answer. All
>> I needed to do to fix is was to run a simple bash command.
>> Unfortunately, I've forgotten what that was :-(
>
> I think you mean “hash -r” to make bash forget previously remembered
> locations.

Indeed, that was it. Thanks for helping out here and on IRC!

I'll mention here for posterity that restarting the system also "fixes"
the issue.

I still don't understand why bash found guix 0.14 after guix pulling
from guix 0.15 though.

Thanks again,
Alex

Message #19 received at 32789-done <at> debbugs.gnu.org (full text, mbox):

From: Ricardo Wurmus <rekado <at> elephly.net>
To: Alex Branham <alex.branham <at> gmail.com>
Cc: 32789-done <at> debbugs.gnu.org
Subject: Re: bug#32789: Bash finds old version of guix after guix pull
Date: Fri, 21 Sep 2018 18:06:16 +0200

Hi Alex,

> I'll mention here for posterity that restarting the system also "fixes"
> the issue.

Yes, bash will not remember paths across reboots.

> I still don't understand why bash found guix 0.14 after guix pulling
> from guix 0.15 though.

Bash optimizes lookups on the PATH; having found an executable on PATH
once, it can remember that location for a minor speed boost.  The only
problem with this is that the cache can go stale.

From what I understand remembering locations is usually done manually by
running “hash”.  I don’t know what would trigger this behaviour in your
case.

--
Ricardo

Message #22 received at 32789-done <at> debbugs.gnu.org (full text, mbox):

From: Alex Branham <alex.branham <at> gmail.com>
To: Ricardo Wurmus <rekado <at> elephly.net>
Cc: 32789-done <at> debbugs.gnu.org
Subject: Re: bug#32789: Bash finds old version of guix after guix pull
Date: Fri, 21 Sep 2018 12:47:27 -0500

On Fri 21 Sep 2018 at 11:06, Ricardo Wurmus <rekado <at> elephly.net> wrote:

> Bash optimizes lookups on the PATH; having found an executable on PATH
> once, it can remember that location for a minor speed boost.  The only
> problem with this is that the cache can go stale.
>
> From what I understand remembering locations is usually done manually by
> running “hash”.  I don’t know what would trigger this behaviour in your
> case.

Right, all that makes sense. I'm wondering why/how bash ever found
guix-0.14 since I started out with guix-0.15.

Alex

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