$ git clone -n https://src.fedoraproject.org/rpms/fontaine.git /var/lib/mock/f45-build-9132-399/root/chroot_tmpdir/scmroot/fontaine
Cloning into '/var/lib/mock/f45-build-9132-399/root/chroot_tmpdir/scmroot/fontaine'...
$ git fetch origin d536273bc6f5d98315b4bd565a10b925b7739994:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fontaine
 * [new ref]         d536273bc6f5d98315b4bd565a10b925b7739994 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d536273 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild