$ git clone -n https://src.fedoraproject.org/rpms/kf5-kjsembed.git /var/lib/mock/f45-build-14868-464/root/chroot_tmpdir/scmroot/kf5-kjsembed
Cloning into '/var/lib/mock/f45-build-14868-464/root/chroot_tmpdir/scmroot/kf5-kjsembed'...
$ git fetch origin c8fb768f616785f8d830748a6dae54d6942de3f1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-kjsembed
 * [new ref]         c8fb768f616785f8d830748a6dae54d6942de3f1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c8fb768 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild