[Nix-dev] Non-Garbage-Collected Development Environments

[Aristid Breitkreuz]

nix-shell supports --add-root. The command should be something like this:

nix-shell --indirect --add-root shell/deps

(You should have a / in there to put all dependencies into a single
directory, as it generates foo-1, foo-2... files.)

Bas van Dijk <v.dijk.bas at gmail.com> schrieb am Di., 22. Dez. 2015 um
17:01 Uhr:

> Thanks Tomasz! I didn't know about gc-keep-outputs. I'll try it out.
>
> On 20 December 2015 at 18:51, Tomasz Kontusz <tomasz.kontusz at gmail.com>
> wrote:
> > I think the nix-instantiate trick will only stop the GC if you have
> > "gc-keep-outputs = true" in nix.conf.
> >
> > On 20.12.2015 18:16, Bas van Dijk wrote:
> >> Hello,
> >>
> >> At LumiGuide we're working on several projects. Each project has its
> >> own attribute. To work on a project we can use nix-shell to enter a
> >> development environment for that project like:
> >>
> >>    nix-shell -A myProject
> >>
> >> The problem is that once in a while our engineers need to garbage
> >> collect their systems. When they run nix-collect-garbage some or all
> >> of the dependencies of myProject might get collected. How can I
> >> prevent this from happening?
> >>
> >> I tried using the approach described in the wiki [1]. We can register
> >> myProject.drv as a garbage collector root:
> >>
> >>    $ nix-instantiate -A myProject \
> >>        --indirect --add-root $PWD/myProject.drv
> >>
> >> Then we can enter the environment using:
> >>
> >>    $ nix-shell $PWD/myProject.drv
> >>
> >> However, this doesn't prevent the dependencies from being collected
> >> since myProject.drv only depends on the .drv files of the
> >> dependencies, i.e. not the actual realized store paths.
> >>
> >> I think myEnvFun might be the solution but the wiki mentions it's
> >> deprecated. Does anybody know what I should use instead?
> >>
> >> Cheers,
> >>
> >> Bas
> >>
> >> [1] https://nixos.org/wiki/Development_Environments
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> >
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