[Nix-dev] How to delete old generations and GC them, without GCing anything else?

[Vladimír Čunát]

On 03/06/2016 02:14 PM, Kosyrev Serge wrote:
> Vladimír Čunát <vcunat at gmail.com> writes:
>> On 03/06/2016 01:10 PM, Matthias Beyer wrote:
>>> I want to remove old system generations and GC the packages, _without_ removing
>>> anything else but these generations and their packages.
>>
>> I would `nix-store --gc --print-dead` before and after deleting the
>> generations, and then I would use `comm` to compute the difference and
>> remove it by `nix-store --gc --delete`.
> 
> How does this differ from deleting
> 
>   /nix/var/nix/gcroots/profiles/system/system-{old,old,old,old}-link
> 
> and then running `nix-store --gc`?

It differs by not deleting stuff that was deletable before removing
those system generations. That's what I assume was wanted by "...
_without_ removing anything else but these generations and their packages."

--Vladimir


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