$ git clone -n https://src.fedoraproject.org/rpms/golang-github-bits-and-blooms-bloom.git /var/lib/mock/f38-build-side-42-init-devel-1043501-29760/root/chroot_tmpdir/scmroot/golang-github-bits-and-blooms-bloom
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1043501-29760/root/chroot_tmpdir/scmroot/golang-github-bits-and-blooms-bloom'...
$ git fetch origin 4a84513d228b2227794ff8e84c32704a3b1e780d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-bits-and-blooms-bloom
 * [new ref]         4a84513d228b2227794ff8e84c32704a3b1e780d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4a84513 Added the README