Drop into a nix shell with ghcHEAD

Matthew Pickering matthewtpickering at gmail.com
Tue Jan 22 14:49:25 UTC 2019

I just extended it slightly so you can grab artifacts from MRs as
well. The interface is not perfect but should still be useful.


You can specify the two options `fork` and `branch` in order to download
an artefact for a contributors branch in order to test a merge request. For
example in order to test
[!180](https://gitlab.haskell.org/ghc/ghc/merge_requests/180) which
is on the fork called `brprice` and from branch `wip/doc-pragma-fixes`
I can run:

nix run -f https://github.com/mpickering/ghc-artefact-nix/archive/master.tar.gz
      --argstr fork brprice \
      --argstr branch wip/doc-pragma-fixes \
      ghcHEAD cabal-install

On Thu, Jan 17, 2019 at 3:49 AM chessai . <chessai1996 at gmail.com> wrote:
> Beautiful. Thanks for sharing
> On Wed, Jan 16, 2019 at 9:34 AM Matthew Pickering <matthewtpickering at gmail.com> wrote:
>> Hi all,
>> I have written a devastating new script which makes it easy to test
>> snippets and packages with build artefacts built by the gitlab CI. One
>> invocation of `nix-shell` will enter an environment with the most
>> recent build artefact from master.
>> Usage:
>> ```
>> > nix-shell https://github.com/mpickering/ghc-artefact-nix/archive/master.tar.gz
>> unpacking 'https://github.com/mpickering/ghc-artefact-nix/archive/master.tar.gz'...
>> <lots more output>
>> > ghc --version
>> The Glorious Glasgow Haskell Compilation System, version 8.7.20190115
>> ```
>> Repo: https://github.com/mpickering/ghc-artefact-nix
>> So far we have tested it works on NixOS and darwin but support for
>> other platforms that nix supports and we build artefacts for should be
>> easy. It might already work on i386 and aarch64 as well but I didn't
>> test these.
>> Cheers,
>> Matt
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