$ git clone -n https://src.fedoraproject.org/rpms/perl-Fennec-Lite.git /var/lib/mock/f45-build-23462-597/root/chroot_tmpdir/scmroot/perl-Fennec-Lite
Cloning into '/var/lib/mock/f45-build-23462-597/root/chroot_tmpdir/scmroot/perl-Fennec-Lite'...
$ git fetch origin af5aeb75673b308f20837bcd8a5a06b96e4200d0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Fennec-Lite
 * [new ref]         af5aeb75673b308f20837bcd8a5a06b96e4200d0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at af5aeb7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild