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

[Bas van Dijk]

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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