GNU bug report logs - #46291
[PATCH] environment: Allow starting from existing profile

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From: 宋文武 <iyzsong <at> outlook.com>
To: Lars-Dominik Braun <lars <at> 6xq.net>
Cc: 46291-done <at> debbugs.gnu.org
Subject: [bug#46291] [PATCH] environment: Allow starting from existing profile
Date: Thu, 11 Feb 2021 18:01:31 +0800

Lars-Dominik Braun <lars <at> 6xq.net> writes:

> Hi everyone,
>
> the attched patch allows starting a `guix environment` from an existing
> profile. Our use-case is this: We have profiles, created by
>
> 	guix package -p /path -i &
>
> because we need to parse desktop files in /path/share/applications. Also
> this does the heavy-lifting (substitutes/building/grafting) upfront once
> and not when starting an environment. Then we start an application from
> this profile using
>
> 	guix environment -C [&] -p /path -- jupyterlab [&]
>
> This is much faster (10x) for large profiles (i.e. JupyterLab) than
>
> 	guix environment -C [&] -m manifest.scm -- jupyterlab [&]
>
> and makes sure the environment is exactly the same as
>
> 	source /path/etc/profile
>
> I think there have been many discussions about how `guix environment`
> should work and this is certainly not the silver bullet, but it.s a huge
> improvement for us with very limited code changes required.

Look excellent to me, pushed, thank you!

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