$ git clone -n https://src.fedoraproject.org/rpms/perl-Class-Unload.git /var/lib/mock/f45-build-22383-591/root/chroot_tmpdir/scmroot/perl-Class-Unload
Cloning into '/var/lib/mock/f45-build-22383-591/root/chroot_tmpdir/scmroot/perl-Class-Unload'...
$ git fetch origin 166f6defa66ce7705cb930e0f6cf6a873764539f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Class-Unload
 * [new ref]         166f6defa66ce7705cb930e0f6cf6a873764539f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 166f6de Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild