Instructions for alpine / dockerfile

[chrissound]

I'm trying to use the new alpine package using docker with a Dockerfile as:

FROM alpine:edge
RUN apk add --no-cache ghc
CMD ["sh"]

The result is:

Sending build context to Docker daemon 2.048 kB
Step 1/3 : FROM alpine:edge
 ---> 9655ad68a6c9
Step 2/3 : RUN apk add --no-cache ghc
 ---> Running in 2fdff1fee961
fetch http://dl-cdn.alpinelinux.org/alpine/edge/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/edge/community/x86_64/APKINDEX.tar.gz
ERROR: unsatisfiable constraints:
  ghc (missing):
    required by: world[ghc]
The command '/bin/sh -c apk add --no-cache ghc' returned a non-zero code: 1

Can anyone point me in the right direction to use this?

[mkoloberdin]

You need to add the "testing" repo to your /etc/apk/repositories

[mitchty]

Yep, that or do this:

# apk --no-cache add --repository http://dl-cdn.alpinelinux.org/alpine/edge/testing ghc

Note, cabal isn't yet in the testing/edge repo. alpinelinux/aports#915

[chrissound]

Thank you!

[chrissound]

@mitchty Is there possibly an older / alternative version that has cabal on it?

[mitchty]

Yep, you can just use the old ports version like in the example docker file. Or if you don't want to add that as a repo you can just copy my signing key and then apk add as above with no-cache and get cabal or stack.

That is just copy the mitch.tishmack@gmail.com-55881c97.rsa.pub key in the examples directory to say /etc/apk/keys/mitch.tishmack@gmail.com-55881c97.rsa.pub

Then apk --no-cache add --repository https://s4-us-west-2.amazonaws.com/alpine-ghc/8.0 cabal

Should do it until cabal is upstreamed. Note stack is in there as well if you want it.

[chrissound]

I'm getting an error of Unable to find installation URLs for OS key: linux64-ncurses6-nopie for stack build. I think it might be similar to the following issue: commercialhaskell/stack#257 (Arch linux though).

[mitchty]

Not sure exactly what you're doing but note all the apk's have very minimal depends lines. They have enough to run the commands on their own, but not necessarily enough to be fully functional. At a glance I'd presume you need to add ncurses-dev or the ncurses apks.

That or add all of alpine-sdk. The packages are meant to be minimal so that you can customize the size of your installs. Notably that means if you need to use ncurses headers etc..., its on yourself to add those to your build containers. Those who don't need ncurses for their development would remain unaffected.

[chrissound]

Many thanks @mitchty ! Really appreciate all your help.

I'm guessing I'll have to liaise with the alpine community / forums to know which packages I need to install to fulfill the necessary dependencies (if they occur in future)?

[mitchty]

Mostly, all you really need to do is look at the build logs and look for whatever header files don't get found and find out what apk provides them.

http://pkgs.alpinelinux.org/packages

Is about the best way to find files at the moment.

[mitchty]

Also:
https://forum.alpinelinux.org/forum/general-discussion/how-find-out-which-package-provides-some-feature-or-file