$ git clone -n https://src.fedoraproject.org/rpms/rust-uu_whoami.git /var/lib/mock/f45-build-46040-830/root/chroot_tmpdir/scmroot/rust-uu_whoami
Cloning into '/var/lib/mock/f45-build-46040-830/root/chroot_tmpdir/scmroot/rust-uu_whoami'...
$ git fetch origin 56554ebca5f18ec2074c854251de9735de3dffc5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uu_whoami
 * [new ref]         56554ebca5f18ec2074c854251de9735de3dffc5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 56554eb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild