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

[Teo Klestrup Röijezon]

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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