$ git clone -n https://src.fedoraproject.org/rpms/rust-arrow-array.git /var/lib/mock/f45-build-40133-768/root/chroot_tmpdir/scmroot/rust-arrow-array
Cloning into '/var/lib/mock/f45-build-40133-768/root/chroot_tmpdir/scmroot/rust-arrow-array'...
$ git fetch origin 52093112301363199fde1143eee16a7e48715ca7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-arrow-array
 * [new ref]         52093112301363199fde1143eee16a7e48715ca7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5209311 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild