Way to pass custom options to hook script

[ezyang]

On IRC, akegalj asked if there was a way to pass arguments to a hook specifically. I don't think there is any way to do this. It seems like a good thing to offer, but I don't know how to integrate it smoothly into existing hooks. See also #3600

[akegalj]

Looks like there is a way to do this.

We can declare some flag in cabal with

Flag FlagName
  Default:     False

and then from UserHooks (for example postReg http://hackage.haskell.org/package/Cabal-1.24.0.0/docs/Distribution-Simple-UserHooks.html#v:postReg) we can use LocalBuildInfo.configFlags.configConfigurationsFlags http://hackage.haskell.org/package/Cabal-1.24.0.0/docs/Distribution-PackageDescription.html#t:FlagAssignment . FlagName should appear in this list.

We should close this issue.

[ezyang]

Note: you probably want to declare the flag as manual.

What if you want to pass a string? But if you're not asking for that, yes, let's close this.

[akegalj]

What if you want to pass a string?

I guess it is a valid use case but we don't have it. Using LocalBuildInfo.configFlags.configConfigurationsFlags solves our problems.

You might still want to keep this issue if you find that feature like that should be implemented.

[ezyang]

OK I'm closing this. If someone else wants it they can shout.