$ git clone -n https://src.fedoraproject.org/rpms/ghc-mime-types.git /var/lib/mock/f41-build-837653-159298/root/chroot_tmpdir/scmroot/ghc-mime-types
Cloning into '/var/lib/mock/f41-build-837653-159298/root/chroot_tmpdir/scmroot/ghc-mime-types'...
$ git fetch origin 20c1d94051a4e2a122ecb669a62508b6be30bb2c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-mime-types
 * [new ref]         20c1d94051a4e2a122ecb669a62508b6be30bb2c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 20c1d94 https://hackage.haskell.org/package/mime-types-0.1.2.0/changelog