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Document you can use a 'src' attribute in hackage-packages.nix #480

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Document you can use a 'src' attribute in hackage-packages.nix #480

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Document you can use a 'src' attribute in hackage-packages.nix
raboof Jan 29, 2021
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Document override instead of editing hackage-packages.nix
raboof Feb 17, 2021
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Use overrideSrc
raboof Feb 17, 2021
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16 changes: 16 additions & 0 deletions doc/nixpkgs-users-guide.rst
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Expand Up @@ -134,6 +134,22 @@ on that compiler. Also, the attributes ``haskell.compiler.ghcXYC`` and
``haskell.packages.ghcXYC.ghc`` are synonymous for the sake of
convenience.

How to install a branch of a package
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

One of the nice things about Nix is that since nixpkgs contains all
information to build a package. This makes it easy to point a package
to a different branch of the source and have Nix build a package for
that branch.

Even though Haskell packages are typically generated based on the hackage
releases, because hackage contains source packages this is still possible
for hackage. You can simply add a ``src`` attribute to any of the entries
in ``hackage-packages.nix``.

This is of course not a long-term solution, as ``hackage-packages.nix``
is a generated file and your changes will be lost when it is regenerated.

How to create a development environment
---------------------------------------

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