$ git clone -n https://src.fedoraproject.org/rpms/rust-atomic0.5.git /var/lib/mock/f45-build-40299-770/root/chroot_tmpdir/scmroot/rust-atomic0.5
Cloning into '/var/lib/mock/f45-build-40299-770/root/chroot_tmpdir/scmroot/rust-atomic0.5'...
$ git fetch origin acc183566f6db378dd5440dba707aee05373a54e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-atomic0.5
 * [new ref]         acc183566f6db378dd5440dba707aee05373a54e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at acc1835 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild