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

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

From: Lars-Dominik Braun <lars <at> 6xq.net>
To: guix-patches <at> gnu.org
Subject: [PATCH] environment: Allow starting from existing profile
Date: Thu, 4 Feb 2021 11:13:20 +0100

[Message part 1 (text/plain, inline)]

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.

Cheers,
Lars

[0001-environment-Allow-starting-from-existing-profile.patch (text/x-diff, attachment)]

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