$ git clone -n https://src.fedoraproject.org/rpms/ghc-rio.git /var/lib/mock/f39-build-2028908-47402/root/chroot_tmpdir/scmroot/ghc-rio
Cloning into '/var/lib/mock/f39-build-2028908-47402/root/chroot_tmpdir/scmroot/ghc-rio'...
$ git fetch origin bc21d2f17cbcfb4cfe7c2fc422eb389ebaa36eca:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-rio
 * [new ref]         bc21d2f17cbcfb4cfe7c2fc422eb389ebaa36eca -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bc21d2f bump release