$ git clone -n https://src.fedoraproject.org/rpms/golang-github-altree-bigfloat.git /var/lib/mock/f38-build-side-42-init-devel-811740-28302/root/chroot_tmpdir/scmroot/golang-github-altree-bigfloat
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-811740-28302/root/chroot_tmpdir/scmroot/golang-github-altree-bigfloat'...
$ git fetch origin d99fd6548beff1bc0f9a7dadf2f7e782aa5d2e59:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-altree-bigfloat
 * [new ref]         d99fd6548beff1bc0f9a7dadf2f7e782aa5d2e59 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d99fd65 Initial import (#2183704).