[Nix-dev] How to use a previous build from hydra-server

[Roger Qiu]

If there are multiple channels (custom channels included) available, how
does Nix choose from which to install, and is there a way for us to pick a
preference?
On 08/12/2015 5:52 PM, "Teo Klestrup Röijezon" <teo at nullable.se> wrote:

> You can import a package from a specific version of nixpkgs, independent
> of the rest of your build, though it's a bit of a manual process.
>
> First, check on Hydra which Git revision it is that you want to build (you
> can see this on the Inputs tab, 144d13cf2cc6de28f8abe9e9e8c98f28ccf8fc59 in
> this case). Then check what Nix's hash of that revision is, (either by
> running nix-prefetch-git or by looking at the store path in the Inputs tab,
> in this case phb6bdyhvnsx92mh78jysaavgviwqpbr). Then replace the reference
> to the package with a reference to the package in that version of nixpkgs.
> Now, with most NixOS modules you could do this by setting something like
>
> services.mesos.pkg = (import (lib.fetchGit {
>   url = https://github.com/NixOS/nixpkgs.git;
>   rev = "144d13cf2cc6de28f8abe9e9e8c98f28ccf8fc59";
>   sha256 = "phb6bdyhvnsx92mh78jysaavgviwqpbr";
> }) {}).pkgs.mesos;
>
> However, from what I can tell, the mesos module (
> https://github.com/NixOS/nixpkgs/blob/788800e437c4a0a25d95e217540bded68804b25e/nixos/modules/services/misc/mesos-slave.nix)
> is one of the few modules that don't support replacing the package used.
> So, uh, that's a problem that should probably be fixed, but won't really
> help you right now. :/
>
> On 8 December 2015 at 05:08, rohit yadav <rohityadav7787 at gmail.com> wrote:
>
>> Hi Rok,
>>
>> Thanks for reply. How should I fetch it? I mean how to tell the system to
>> use that particular build? Currently, when I say nixos-rebuild {boot |
>> switch} it assumes that that <nixpkgs> (which again I am not sure which one
>> it refers to when I have to two channels listed) would tell it the right
>> hash and it would fetch that from the server. I dunno know how to by-pass
>> that and directly fetch any particular build from hydra. Could you please
>> elaborate on this or refer to the documentation where it is described in
>> more detail.
>>
>> Thanks,
>> Rohit
>>
>> On Mon, Dec 7, 2015 at 9:45 PM, Rok Garbas <rok at garbas.si> wrote:
>>
>>> you can fetch mesos directly from hydra
>>>
>>>
>>> http://hydra.nixos.org/job/nixos/trunk-combined/nixpkgs.mesos.x86_64-linux
>>>
>>> check latest successful build for instructions.
>>>
>>>
>>>
>>> Quoting rohit yadav (2015-12-08 03:54:05)
>>> > One more question. Is it possible to add two channels? Say one
>>> unstable and one
>>> > previous stable channel and choose module from one of them?
>>> >
>>> > Thanks.
>>> > Rohit
>>> >
>>> > On Mon, Dec 7, 2015 at 8:47 PM, rohit yadav <rohityadav7787 at gmail.com>
>>> wrote:
>>> >
>>> >     Hi,
>>> >
>>> >     Currently Mesos package is broken on nixos-unstable channel,
>>> therefore, I
>>> >     cannot install it on my server. Is there a way to install a
>>> previous
>>> >     successful build?
>>> >
>>> >     Thanks,
>>> >     Rohit
>>> >
>>> >
>>>
>>>
>>> --
>>> Rok Garbas - http://www.garbas.si
>>>
>>
>>
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>
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