$ git clone -n https://src.fedoraproject.org/rpms/platform.git /var/lib/mock/f45-build-28700-632/root/chroot_tmpdir/scmroot/platform
Cloning into '/var/lib/mock/f45-build-28700-632/root/chroot_tmpdir/scmroot/platform'...
$ git fetch origin 7930c93509c1140ba34b6b616a6c1801cd655c0f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/platform
 * [new ref]         7930c93509c1140ba34b6b616a6c1801cd655c0f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7930c93 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild