$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Timer.git /var/lib/mock/f45-build-26987-620/root/chroot_tmpdir/scmroot/perl-Test-Timer
Cloning into '/var/lib/mock/f45-build-26987-620/root/chroot_tmpdir/scmroot/perl-Test-Timer'...
$ git fetch origin 050ac3fc03450f4c3ce4e786234db77435311450:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Timer
 * [new ref]         050ac3fc03450f4c3ce4e786234db77435311450 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 050ac3f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild