$ git clone -n https://src.fedoraproject.org/rpms/gucharmap.git /var/lib/mock/f45-build-13235-447/root/chroot_tmpdir/scmroot/gucharmap
Cloning into '/var/lib/mock/f45-build-13235-447/root/chroot_tmpdir/scmroot/gucharmap'...
$ git fetch origin da02b75a2a623bcaa6363050491cc6c907ef8ae9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gucharmap
 * [new ref]         da02b75a2a623bcaa6363050491cc6c907ef8ae9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at da02b75 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild