$ git clone -n https://src.fedoraproject.org/rpms/rust-arrow-buffer.git /var/lib/mock/f45-build-40138-768/root/chroot_tmpdir/scmroot/rust-arrow-buffer
Cloning into '/var/lib/mock/f45-build-40138-768/root/chroot_tmpdir/scmroot/rust-arrow-buffer'...
$ git fetch origin 0ebdef96488ad759a1bb8fa786f82a3ebeacf909:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-arrow-buffer
 * [new ref]         0ebdef96488ad759a1bb8fa786f82a3ebeacf909 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0ebdef9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild