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John A. Lotoski
09526c8555
* Spelling and typo fixes in doc and code comments * Trailing whitespace or whitespace only truncation * readTheDocs formatting corrections
37 lines
1.9 KiB
Markdown
37 lines
1.9 KiB
Markdown
# Bumping Hackage and Stackage snapshots
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`haskell.nix` relies on some generated data providing information about packages in Hackage and Stackage snapshots.
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These are kept in [`hackage.nix`](https://github.com/input-output-hk/hackage.nix) and [`stackage.nix`](https://github.com/input-output-hk/stackage.nix) respectively.
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If your project depends on a Hackage package, then the `hackage.nix` revision used must be new enough to contain that, and likewise for Stackage snaphots and `stackage.nix`.
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## Updating and pinning `hackage.nix` and `stackage.nix`
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`haskell.nix` pins particular revisions of these repositories internally, both for our own usage in testing, and so that users have a sensible default when getting started.
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These revisions are updated nightly, so you can get newer revisions of `hackage.nix` and `stackage.nix` by updating your revision of `haskell.nix` itself.
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However, this exposes you to changes in `haskell.nix` which you may not want, such as changes that force compiler rebuilds, or the occasional bug.
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Instead, you can pin `hackage.nix` and `stackage.nix` independently. For example:
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```nix
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let
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# You can use a tool like `niv` to manage this boilerplate
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hackageSrc = builtins.fetchTarball https://github.com/input-output-hk/hackage.nix/archive/master.tar.gz;
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stackageSrc = builtins.fetchTarball https://github.com/input-output-hk/stackage.nix/archive/master.tar.gz;
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haskellSrc = builtins.fetchTarball https://github.com/input-output-hk/haskell.nix/archive/master.tar.gz;
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haskellNix = import haskellSrc {
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# This allows you to override the pins used by `haskell.nix` internally
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sourcesOverride = {
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hackage = hackageSrc;
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stackage = stackageSrc;
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};
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};
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in ...
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```
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This way you can change the revisions of `hackage.nix` and `stackage.nix`
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without changing `haskell.nix`.
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However, bear in mind that Stackage refers to Hackage, so your Stackage pin
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should never be newer than your Hackage pin.
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