cabal install in sandbox step gets stuck

[Alistair Burrowes]

Hi,

I am trying complete the quick start guide for yesod. I am on Ubuntu 14.04 and have GHC 7.6.3.

The step:

cabal install --enable-tests . yesod-platform yesod-bin --max-backjumps=-1 --reorder-goals

after running cabal sandbox init, never completes. It outputs 'Resolving dependencies...' and runs forever (left it for ~5 hours) and eats up all available memory.

I have tried setting verbosity to 3 in the cabal sandbox config, but I get no more information.

How can I resolve this, or figure out what is going on?

Thanks

[Michael Snoyman]

Sometimes --reorder-goals can cause that. Can you try removing that options and trying again?

What version of cabal-install are you using (cabal --version)?

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[Alistair Burrowes]

Worked. Thanks a lot!

[Alistair Burrowes]

Hm worked once, then I couldn't install persistent-mongodb. Started again from scratch and now get the same issue even without --reorder-goals

cabal-install version 1.20.0.3

using version 1.20.0.1 of the Cabal library 

[Adam Bergmark]

You can try passing `-v3' to cabal to see if it prints something. I'm guessing it's going very deep trying to resolve dependencies and in that case -v3 will keep printing things. Manually constraining some of the dependencies may help, such as (arbitrarily chosen) `--constraint='resourcet==1.1.2.2'.

This has happened to me on several occasions when I've been using older versions of packages.

- Adam

[Alistair Burrowes]

Thanks. Did everything from scratch again. And it all works, but for some reason the 'cabal install --enable-tests . yesod-platform yesod-bin --max-backjumps=-1 --reorder-goals' step doesn't install persistent-mongoDB.

Any ideas?

[Alistair Burrowes]

If I just run 'cabal install' I get the following output:

Resolving dependencies...

cabal: Could not resolve dependencies:

trying: SHA-1.6.4/installed-e61... (user goal)

trying: aeson-0.7.0.6/installed-7fc... (user goal)

trying: yplay-0.0.0 (user goal)

next goal: persistent-mongoDB (dependency of yplay-0.0.0)

rejecting: persistent-mongoDB-1.4.1 (conflict: yplay =>

persistent-mongoDB>=1.3 && <1.4)

trying: persistent-mongoDB-1.3.3.1

next goal: bson (dependency of persistent-mongoDB-1.3.3.1)

rejecting: bson-0.3 (conflict: persistent-mongoDB => bson>=0.2 && <0.3)

rejecting: bson-0.2.4, 0.2.3 (conflict: SHA =>

binary==0.5.1.1/installed-72e..., bson => binary==0.7.*)

rejecting: bson-0.2.2, 0.2.1, 0.2.0 (conflict: aeson =>

text==1.1.1.3/installed-816..., bson => text==0.11.*)

rejecting: bson-0.1.7, 0.1.6, 0.1.5, 0.1.4, 0.1.3, 0.1.2, 0.1.1, 0.1, 0.0.4,

0.0.3, 0.0.2, 0.0.1 (conflict: persistent-mongoDB => bson>=0.2 && <0.3)

Backjump limit reached (change with --max-backjumps).

Note: when using a sandbox, all packages are required to have consistent

dependencies. Try reinstalling/unregistering the offending packages or

recreating the sandbox.

[Greg Weber]

I looks like the issue is the binary package is at 0.5.1.1 but you need 0.7.*

I am not familiar with fixing that issue though.

[Michael Snoyman]

Ah-hah, good catch.

This is in fact an impossible build plan right now. You can work around the problem by dropping yesod-bin from your installation command. You'll probably be better off with GHC 7.8, which doesn't constrain the binary version. Other options include getting a patch into bson which allows older versions of binary. I actually have such a patch for stackage[1], I'll send a pull request to the bson maintainer.

[1] https://github.com/fpco/stackage/blob/master/patching/patches/bson-0.2.4.patch

[Alistair Burrowes]

Thanks guys. I have basically figured this out.

Key things were using the download steps from new-www.haskell.org to get the latest version, not haskell-platform.

I do find I need to install certain versions manually of things manually. in particular installing yesod globally, it seems to depend on a version of happy that is too old for language-javascript. Installing happy with cabal install happy gets past this issue.

I had similar issues on OS X, but a few more cases, can't remember exactly what.. er maybe aeson?

Anyway, all working now so thanks again.