$ git clone -n https://src.fedoraproject.org/rpms/ghc-bifunctors.git /var/lib/mock/f41-build-side-1-2908451-34741/root/chroot_tmpdir/scmroot/ghc-bifunctors
Cloning into '/var/lib/mock/f41-build-side-1-2908451-34741/root/chroot_tmpdir/scmroot/ghc-bifunctors'...
$ git fetch origin 7e895817172698ef4365be03b12d9466722ed5b9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-bifunctors
 * [new ref]         7e895817172698ef4365be03b12d9466722ed5b9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7e89581 https://hackage.haskell.org/package/bifunctors-5.6.2/changelog