cabal-install-parsers does not pick up remote-repo field

[andreasabel]

Synopsis: cabal-install-parsers does not pick up remote-repo field.

See haskell-hvr/cabal-plan#70 (comment)

According to https://cabal.readthedocs.io/en/latest/installing-packages.html#legacy-repositories :

  remote-repo: hackage.haskell.org:http://hackage.haskell.org/packages/archive

This is just syntactic sugar for

  repository hackage.haskell.org
    url: http://hackage.haskell.org/packages/archive

although, in (and only in) the specific case of Hackage, the URL http://hackage.haskell.org/packages/archive will be silently translated to http://hackage.haskell.org/.

This is not implemented by

haskell-ci/cabal-install-parsers/src/Cabal/Config.hs

Lines 119 to 127 in a4ea1ed

	-- | Find a @01-index.tar@ for particular repository
	cfgRepoIndex
	:: Config Identity
	-> RepoName
	-> Maybe FilePath
	cfgRepoIndex cfg repo
	| repo `M.member` cfgRepositories cfg =
	Just (runIdentity (cfgRemoteRepoCache cfg) </> repo </> "01-index.tar")
	| otherwise = Nothing

but maybe should, since users may have legacy .cabal/config files.

[phadej]

These legacy config files have to be very old (I haven't seen any new one written in five years).

[andreasabel]

I one started out with v1-cabal, it is not so unlike to have a config file from these times. I am the constructive proof.
Old or not, a spec is a spec...