142 lines
5.4 KiB
Markdown
142 lines
5.4 KiB
Markdown
# Supported tags and respective `Dockerfile` links
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- [`latest`, `7.8` (*7.8/Dockerfile*)](https://github.com/darinmorrison/docker-haskell/blob/399ec9abffb3c86d6747d7ab5dc40556d6de9e4b/7.8/Dockerfile)
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For more information about this image and its history, please see the [relevant
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manifest file
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(`library/haskell`)](https://github.com/docker-library/official-images/blob/master/library/haskell)
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in the [`docker-library/official-images` GitHub
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repo](https://github.com/docker-library/official-images).
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# What is Haskell?
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[Haskell](http://www.haskell.org) is a
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[lazy](http://en.wikibooks.org/wiki/Haskell/Laziness), functional,
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statically-typed programming language with advanced type system features such as
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higher-rank, higher-kinded parametric
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[polymorphism](http://en.wikibooks.org/wiki/Haskell/Polymorphism), monadic
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[effects](http://en.wikibooks.org/wiki/Haskell/Understanding_monads/IO),
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generalized algebraic data types
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([GADT](http://en.wikibooks.org/wiki/Haskell/GADT)s), flexible [type
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classes](http://en.wikibooks.org/wiki/Haskell/Advanced_type_classes), associated
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[type families](http://en.wikipedia.org/wiki/Type_family), and more.
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Haskell's [`ghc`](http://www.haskell.org/ghc) is a
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[portable](https://ghc.haskell.org/trac/ghc/wiki/Platforms),
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[optimizing](http://benchmarksgame.alioth.debian.org/u64q/haskell.php) compiler
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with a foreign-function interface
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([FFI](http://en.wikibooks.org/wiki/Haskell/FFI)), an [LLVM
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backend](https://www.haskell.org/ghc/docs/7.8.3/html/users_guide/code-generators.html),
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and sophisticated runtime support for
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[concurrency](http://en.wikibooks.org/wiki/Haskell/Concurrency),
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explicit/implicit [parallelism](http://community.haskell.org/~simonmar/pcph/),
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runtime [profiling](http://www.haskell.org/haskellwiki/ThreadScope), etc. Other
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Haskell tools like
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[`criterion`](http://www.serpentine.com/criterion/tutorial.html),
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[`quickcheck`](https://www.fpcomplete.com/user/pbv/an-introduction-to-quickcheck-testing),
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[`hpc`](http://www.haskell.org/haskellwiki/Haskell_program_coverage#Examples),
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and [`haddock`](http://en.wikipedia.org/wiki/Haddock_(software)) provide
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advanced benchmarking, property-based testing, code coverage, and documentation
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generation.
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A large number of production-quality Haskell libraries are available from
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[Hackage](https://hackage.haskell.org). The
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[`cabal`](https://www.fpcomplete.com/user/simonmichael/how-to-cabal-install)
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tool fetches packages and builds projects using the Hackage ecosystem.
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## About this image
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This image ships a minimal Haskell toolchain with the following packages:
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* `ghc`
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* `alex`
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* `cabal-install`
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* `happy`
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## How to use this image
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Start an interactive interpreter session with `ghci`:
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$ docker run -it --rm haskell:7.8
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GHCi, version 7.8.3: http://www.haskell.org/ghc/ :? for help
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Loading package ghc-prim ... linking ... done.
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Loading package integer-gmp ... linking ... done.
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Loading package base ... linking ... done.
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Prelude>
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Dockerize a [Hackage](http://hackage.haskell.org) app with a Dockerfile
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inheriting from the base image:
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FROM haskell:7.8
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RUN cabal update && cabal install MazesOfMonad
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VOLUME /root/.MazesOfMonad
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ENTRYPOINT ["/root/.cabal/bin/mazesofmonad"]
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Iteratively develop then ship a Haskell app with a Dockerfile utilizing the
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build cache:
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FROM haskell:7.8
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RUN cabal update
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# Add .cabal file
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ADD ./server/snap-example.cabal /opt/server/snap-example.cabal
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# Docker will cache this command as a layer, freeing us up to
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# modify source code without re-installing dependencies
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RUN cd /opt/server && cabal install --only-dependencies -j4
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# Add and Install Application Code
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ADD ./server /opt/server
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RUN cd /opt/server && cabal install
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# Add installed cabal executables to PATH
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ENV PATH /root/.cabal/bin:$PATH
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# Default Command for Container
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WORKDIR /opt/server
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CMD ["snap-example"]
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### Examples
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See the application snippet above in more detail in the [example snap
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application](https://github.com/darinmorrison/docker-haskell/tree/master/examples/7.8.3/snap).
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# License
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This image is licensed under the MIT License (see
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[LICENSE](https://github.com/darinmorrison/docker-haskell/blob/master/LICENSE)),
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and includes software licensed under the
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[Glasgow Haskell Compiler License](https://www.haskell.org/ghc/license)
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(BSD-style).
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# Supported Docker versions
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This image is officially supported on Docker version 1.5.0.
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Support for older versions (down to 1.0) is provided on a best-effort basis.
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# User Feedback
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## Issues
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If you have any problems with or questions about this image, please contact us
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through a [GitHub issue](https://github.com/darinmorrison/docker-haskell/issues).
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You can also reach many of the official image maintainers via the
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`#docker-library` IRC channel on [Freenode](https://freenode.net).
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## Contributing
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You are invited to contribute new features, fixes, or updates, large or small;
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we are always thrilled to receive pull requests, and do our best to process them
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as fast as we can.
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Before you start to code, we recommend discussing your plans
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through a [GitHub issue](https://github.com/darinmorrison/docker-haskell/issues), especially for more ambitious
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contributions. This gives other contributors a chance to point you in the right
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direction, give you feedback on your design, and help you find out if someone
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else is working on the same thing.
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