$ git clone -n https://src.fedoraproject.org/rpms/scratch.git /var/lib/mock/f45-build-35698-698/root/chroot_tmpdir/scmroot/scratch
Cloning into '/var/lib/mock/f45-build-35698-698/root/chroot_tmpdir/scmroot/scratch'...
$ git fetch origin 187bdddeb899860ff9302bce5f3ff55d5aff8adf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/scratch
 * [new ref]         187bdddeb899860ff9302bce5f3ff55d5aff8adf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 187bddd Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild