$ git clone -n https://src.fedoraproject.org/rpms/sayonara.git /var/lib/mock/f45-build-35542-696/root/chroot_tmpdir/scmroot/sayonara
Cloning into '/var/lib/mock/f45-build-35542-696/root/chroot_tmpdir/scmroot/sayonara'...
$ git fetch origin cb89dbcd272fa9133b55d770e777f1eab15bd5b1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sayonara
 * [new ref]         cb89dbcd272fa9133b55d770e777f1eab15bd5b1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cb89dbc Update to 1.12.0 stable1