$ git clone -n https://src.fedoraproject.org/rpms/perl-File-Pid.git /var/lib/mock/f45-build-23587-598/root/chroot_tmpdir/scmroot/perl-File-Pid
Cloning into '/var/lib/mock/f45-build-23587-598/root/chroot_tmpdir/scmroot/perl-File-Pid'...
$ git fetch origin f5212d2f1fc98f5d3241971a227122962aed3996:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-File-Pid
 * [new ref]         f5212d2f1fc98f5d3241971a227122962aed3996 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f5212d2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild