$ git clone -n https://src.fedoraproject.org/rpms/vsftpd.git /var/lib/mock/f45-build-38179-722/root/chroot_tmpdir/scmroot/vsftpd
Cloning into '/var/lib/mock/f45-build-38179-722/root/chroot_tmpdir/scmroot/vsftpd'...
$ git fetch origin ffa2e7e72e2ffe3f365c6bbc891e7f7190c9fec0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vsftpd
 * [new ref]         ffa2e7e72e2ffe3f365c6bbc891e7f7190c9fec0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ffa2e7e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild