Travis build using cabal-install and ghc 7.10.2 is consistently failing due to strange issues

[mgsloan]

Creating this issue because I am disabling this particular travis test as it is not informative about the health of a particular build of stack, and I have no idea what to do about the issue.

This is the last successful build: https://travis-ci.org/commercialhaskell/stack/jobs/128446008

The first one that failed: https://travis-ci.org/commercialhaskell/stack/jobs/129048856

It fails with many errors about missing files in packages. These errors continue to stick around due to travis caching, so I cleared out the cache. After that, I get different errors:

/home/travis/.ghc/x86_64-linux-7.10.2/package.conf.d/package.cache: openBinaryFile: does not exist (No such file or directory)

Despite our travis not changing, the output in the first two builds seems to be coming from a different version of cabal than the newest build. Perhaps it has something to do with Dependency Cabal ==1.22.7.0: using Cabal-1.22.7.0?

[mgsloan]

This particular failure seems to have resolved itself - https://travis-ci.org/commercialhaskell/stack/builds/134067096