allow "upload" to local repository

[ibotty]

hi,

i have a small shell script that does the following for package-0.1.2. it would be great if cabal could do that out of the box (using gnu tar.)

local_repo is the first repository that is specified as local-repo: in cabal.

> cabal sdist
> cp dist/package-0.1.2.tar.gz "$local_repo/package"
> tar -f "$local_repo/00-index.tar" -A package.cabal \
      --transform 's~package.cabal~package/0.1.2/package.cabal~'

[ibotty]

ah. i would maybe do that myself, when given some pointers.

[ezyang]

This request was made for old-style local package repositories; with the new style, we would need to have hackage-repo-tool available because Cabal does not otherwise have the smarts to update the local repo.