Could not setup with ghci version 7.8.3 in Docker container

[vinh0604]

Hi, I'm running Haskell with a docker container built from darinmorrison/haskell image with ghci version 7.8.3.
When I tried to run .bin/setup-koans as cited in the Readme file, I got the following issue:

Resolving dependencies...
cabal: Could not resolve dependencies:
trying: HaskellKoans-0.1 (user goal)
trying: testloop-0.1.1.0 (dependency of HaskellKoans-0.1)
next goal: unix (dependency of testloop-0.1.1.0)
rejecting: unix-2.7.0.1/installed-0d8..., 2.7.0.1, 2.7.0.0 (conflict: testloop
=> unix>=2.2.0.0 && <2.7)
rejecting: unix-2.6.0.1, 2.6.0.0 (conflict: base==4.7.0.1/installed-e4b...,
unix => base>=4.2 && <4.7)
rejecting: unix-2.5.1.1, 2.5.1.0 (conflict: base==4.7.0.1/installed-e4b...,
unix => base>=4.2 && <4.6)
rejecting: unix-2.5.0.0 (conflict: base==4.7.0.1/installed-e4b..., unix =>
base>=4.2 && <4.5)
rejecting: unix-2.4.2.0, 2.4.1.0 (conflict: base==4.7.0.1/installed-e4b...,
unix => base>=4.2 && <4.4)
rejecting: unix-2.4.0.2, 2.4.0.1 (conflict: base==4.7.0.1/installed-e4b...,
unix => base>=4.2 && <4.3)
rejecting: unix-2.4.0.0 (conflict: base==4.7.0.1/installed-e4b..., unix =>
base>=4.1 && <4.3)
trying: unix-2.3.2.0
next goal: hint (dependency of testloop-0.1.1.0)
rejecting: hint-0.4.2.0, 0.4.1.0, 0.4.0.0 (conflict: testloop => hint==0.3.*)
trying: hint-0.3.3.7
next goal: ghc (dependency of hint-0.3.3.7)
rejecting: ghc-7.8.3/installed-4df... (conflict: unix==2.3.2.0, ghc =>
unix==2.7.0.1/installed-0d8...)
Dependency tree exhaustively searched.

Note: when using a sandbox, all packages are required to have consistent
dependencies. Try reinstalling/unregistering the offending packages or
recreating the sandbox.
setup-koans: [ERROR]cabal install --only-dependencies failed.

Are I missing something that need to be setup first before setting up the koans?
Please help. Thank you in advance.

[worrel]

I had the same issue on Ubuntu 14.04 with the latest binary build of Haskell Platform. The issue is the
testloop library which hardcodes a dependency on unix library < 2.7. Fixed it like this:

1. Clone testloop source from github. I put it as a sibling directory of the HaskellKoans checkout
2. Open testloop.cabal and bump version number near the top to 0.1.1.1. Bump the upper bound of version constraint on unix (near the bottom) to something like <= 2.8
3. I also searched hackage and bumped up the versions of the other testloop dependencies, though this may not be required. I ended up having to lower some of them as putting them all at the latest versions created new conflicts. You may have to experiment here.
4. Built new testloop package according to these instructions. This might not be necessary - the next step might build it for you.
5. Inside "HaskellKoans" make sure you've run /bin/setup-koans once (even if it failed) - this is to ensure the cabal sandbox has been created
6. run cabal sandbox add-source /path/to/your/testloop/checkout. If you made it a sibling of HaskellKoans it would be cabal sandbox add-source ../testloop
7. run ./bin/setup-koans again and it should succeed

[roman]

@worrel please can you do a PR to testloop with those changes?

Thanks

thanks worrel, had the same problem on ubuntu machine... and i had to clone testloop repo, make the patch in cabal config file manually. Why isn't this code

unix >= 2.2.0.0 && <= 2.8

part of the trunk?