$ git clone -n https://src.fedoraproject.org/rpms/rust-arrow-ipc.git /var/lib/mock/f45-build-40147-768/root/chroot_tmpdir/scmroot/rust-arrow-ipc
Cloning into '/var/lib/mock/f45-build-40147-768/root/chroot_tmpdir/scmroot/rust-arrow-ipc'...
$ git fetch origin 105ff409e9cbf1361c8558475081fe414ee83e2c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-arrow-ipc
 * [new ref]         105ff409e9cbf1361c8558475081fe414ee83e2c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 105ff40 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild