Re: Drop into a nix shell with ghcHEAD

I have now added a small wrapper script which allows you to pull artefacts by MR number. https://github.com/mpickering/ghc-artefact-nix#ghc-head-from-script ``` # Fetches MR 180 ghc-head-from 180 ``` ``` #Fetches ghc/master ghc-head-from ``` The most convenient way to access the script is to add the attribute `nur.repos.mpickering.ghc-head-from` to your configuration.nix. Cheers, Matt On Tue, Jan 22, 2019 at 2:49 PM Matthew Pickering wrote:

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

https://github.com/mpickering/ghc-artefact-nix

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 . wrote:

...

Beautiful. Thanks for sharing

On Wed, Jan 16, 2019 at 9:34 AM Matthew Pickering 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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