$ git clone -n https://src.fedoraproject.org/rpms/rubygem-launchy.git /var/lib/mock/f45-build-35053-693/root/chroot_tmpdir/scmroot/rubygem-launchy
Cloning into '/var/lib/mock/f45-build-35053-693/root/chroot_tmpdir/scmroot/rubygem-launchy'...
$ git fetch origin cc6d47108582e5de54f8298d272af51b3e7926d4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-launchy
 * [new ref]         cc6d47108582e5de54f8298d272af51b3e7926d4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cc6d471 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild