Testing a new stack resolver
When there’s been a new GHC release, it can take a little while for there to be a stack resolver for it. The following procedure can be used for some local testing if you want to get ahead of the game1.
Where stack looks for resolvers
If you execute the command,
$stack setup --resolver ghc-x.y.zyou’ll see something like
No setup information found for ghc-x.y.z on your platform.if there isn’t yet a resolver for ghc-x.y.z.
The default set of resolvers stack “knows about” are those enumerated in the file stack-setup-2.yaml in the commericalhaskell/stackage-content repository.
Create a local stack setup file
- Start by downloading the release binary package tarball of interest from www.haskell.org and note its
- size (in bytes):
stat -f%z ghc-x.y.z-x86_64-apple-darwin.tar.xzSHA1hash:
shasum -a 1 ghc-x.y.z-x86_64-apple-darwin.tar.xzSHA256hash:
shasum -a 256 ghc-x.y.z-x86_64-apple-darwin.tar.xz - Now, create
stack-setup-2-ghc-x.y.z.yamlwith contents along the lines of
ghc:
macosx:
x.y.z:
url: http://downloads.haskell.org/~ghc/x.y.z/ghc-x.y.z-x86_64-apple-darwin.tar.xz
content-length: 177152992
sha1: 2dbd726860ed2c0ea04c7aca29c22df20b952ee1
sha256: f2e8366fd3754dd9388510792aba2d2abecb1c2f7f1e5555f6065c3c5e2ffec4Update: Here’s an even easier way.
ghc:
macosx:
x.y.z:
url: /path/to/ghc-x.y.z-x86_64-apple-darwin.tar.xzInstall GHC version x.y.z via the setup file
The following stack setup command will use the setup file created above to download and install ghc-x.y.z:
stack --setup-info-yaml stack-setup-2-ghc-x.y.z.yaml --resolver ghc-x.y.z setupOnce stack has got GHC installed, there’s no further any need to pass a setup-info-yaml argument to subsequent stack commands, it’s ready to go!
