$ git clone -n https://src.fedoraproject.org/rpms/rust-arrow-arith.git /var/lib/mock/f45-build-40134-768/root/chroot_tmpdir/scmroot/rust-arrow-arith
Cloning into '/var/lib/mock/f45-build-40134-768/root/chroot_tmpdir/scmroot/rust-arrow-arith'...
$ git fetch origin 895e9e147bfacd44f34a079c8c4df6090e3cf6f0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-arrow-arith
 * [new ref]         895e9e147bfacd44f34a079c8c4df6090e3cf6f0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 895e9e1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild