$ git clone -n https://src.fedoraproject.org/rpms/kf5-kholidays.git /var/lib/mock/f45-build-14838-464/root/chroot_tmpdir/scmroot/kf5-kholidays
Cloning into '/var/lib/mock/f45-build-14838-464/root/chroot_tmpdir/scmroot/kf5-kholidays'...
$ git fetch origin 9afaf013ae6e38c775d6ee42b039b2ce58a46c2c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-kholidays
 * [new ref]         9afaf013ae6e38c775d6ee42b039b2ce58a46c2c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9afaf01 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild