$ git clone -n https://src.fedoraproject.org/rpms/dh-make.git /var/lib/mock/f45-build-7464-364/root/chroot_tmpdir/scmroot/dh-make
Cloning into '/var/lib/mock/f45-build-7464-364/root/chroot_tmpdir/scmroot/dh-make'...
$ git fetch origin 1e9016ceb78c0db7eae52b9fa8d7a6d03bfdda17:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dh-make
 * [new ref]         1e9016ceb78c0db7eae52b9fa8d7a6d03bfdda17 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1e9016c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild