$ git clone -n https://src.fedoraproject.org/rpms/ghc-transformers-base.git /var/lib/mock/f41-build-838862-159865/root/chroot_tmpdir/scmroot/ghc-transformers-base
Cloning into '/var/lib/mock/f41-build-838862-159865/root/chroot_tmpdir/scmroot/ghc-transformers-base'...
$ git fetch origin 2bb2d795c24c2c32a61014cd0bb1dea3d05a190e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-transformers-base
 * [new ref]         2bb2d795c24c2c32a61014cd0bb1dea3d05a190e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2bb2d79 bump release