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bug#33647: First `guix pull' behaves unexpectedly

From: Diego Nicola Barbato
Subject: bug#33647: First `guix pull' behaves unexpectedly
Date: Wed, 19 Dec 2018 13:49:17 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux)


Ludovic Courtès <address@hidden> writes:

> Diego Nicola Barbato <address@hidden> skribis:
>> Ludovic Courtès <address@hidden> 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.



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