$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Expect.git /var/lib/mock/f45-build-26650-618/root/chroot_tmpdir/scmroot/perl-Test-Expect
Cloning into '/var/lib/mock/f45-build-26650-618/root/chroot_tmpdir/scmroot/perl-Test-Expect'...
$ git fetch origin 4559d6eadc6d08dfc84a0e6b3023e01e88c56956:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Expect
 * [new ref]         4559d6eadc6d08dfc84a0e6b3023e01e88c56956 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4559d6e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild