$ git clone -n https://src.fedoraproject.org/rpms/samplv1.git /var/lib/mock/f45-build-35533-696/root/chroot_tmpdir/scmroot/samplv1
Cloning into '/var/lib/mock/f45-build-35533-696/root/chroot_tmpdir/scmroot/samplv1'...
$ git fetch origin 350541fcba455de21a8818b74cd110923f4c5b0d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/samplv1
 * [new ref]         350541fcba455de21a8818b74cd110923f4c5b0d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 350541f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild