$ git clone -n https://src.fedoraproject.org/rpms/perl-Time-Period.git /var/lib/mock/f45-build-27129-621/root/chroot_tmpdir/scmroot/perl-Time-Period
Cloning into '/var/lib/mock/f45-build-27129-621/root/chroot_tmpdir/scmroot/perl-Time-Period'...
$ git fetch origin 93a852632de47f5e7d4aed220bc840de6274e72e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Time-Period
 * [new ref]         93a852632de47f5e7d4aed220bc840de6274e72e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 93a8526 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild