$ git clone -n https://src.fedoraproject.org/rpms/perl-String-Print.git /var/lib/mock/f45-build-26383-617/root/chroot_tmpdir/scmroot/perl-String-Print
Cloning into '/var/lib/mock/f45-build-26383-617/root/chroot_tmpdir/scmroot/perl-String-Print'...
$ git fetch origin f62acc3d6df447692c10079921e3963765a21b8e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-String-Print
 * [new ref]         f62acc3d6df447692c10079921e3963765a21b8e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f62acc3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild