$ git clone -n https://src.fedoraproject.org/rpms/perl-Class-Date.git /var/lib/mock/f45-build-22368-591/root/chroot_tmpdir/scmroot/perl-Class-Date
Cloning into '/var/lib/mock/f45-build-22368-591/root/chroot_tmpdir/scmroot/perl-Class-Date'...
$ git fetch origin 7865a44407b0933d9982aba583af9aaade561b52:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Class-Date
 * [new ref]         7865a44407b0933d9982aba583af9aaade561b52 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7865a44 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild