$ git clone -n https://src.fedoraproject.org/rpms/rust-arrow-schema.git /var/lib/mock/f45-build-40151-768/root/chroot_tmpdir/scmroot/rust-arrow-schema
Cloning into '/var/lib/mock/f45-build-40151-768/root/chroot_tmpdir/scmroot/rust-arrow-schema'...
$ git fetch origin 6cc8e6d0471d61a87b64aea7d64b70662629cd79:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-arrow-schema
 * [new ref]         6cc8e6d0471d61a87b64aea7d64b70662629cd79 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6cc8e6d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild