$ git clone -n https://src.fedoraproject.org/rpms/perl-Date-Extract.git /var/lib/mock/f45-build-23000-595/root/chroot_tmpdir/scmroot/perl-Date-Extract
Cloning into '/var/lib/mock/f45-build-23000-595/root/chroot_tmpdir/scmroot/perl-Date-Extract'...
$ git fetch origin 620b10764528fb9cce91f1f8914e30dff0903c5e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Date-Extract
 * [new ref]         620b10764528fb9cce91f1f8914e30dff0903c5e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 620b107 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild