add a flag/config to make cabal use sudo/su/.. when installing with --global

[guest]

cabal install --global usually fails because of missing privileges. sudo cabal install --global is quite messy since every intermediate file is then owned by root, so other tasks that wouldn't need privileges at all, now requires them to handle those files. I propose to add the possibility to configure a command to use when running the equivalent of "runhaskell Setup install" on the package. So that the user can set it in ~/.cabal/config and it will always be used when install --global is run.

[duncan]

Apparently lots of Debian tools take -rsudo or --rootcmd=sudo and we could allow something similar either on the command line or in the cabal-install configuration file or both.

[duncan]

Fixed:

Thu Mar  6 16:08:16 GMT 2008  Andrea Vezzosi <sanzhiyan@gmail.com>
  * Implement CLI flag --root-cmd for 'cabal install' as in #202
  It also adds the internal flag --only so we can avoid building a setup when build-type == Simple.

[elga]

*  virgin mobile