$ git clone -n https://src.fedoraproject.org/rpms/rust-aom-sys.git /var/lib/mock/f40-build-2658103-66917/root/chroot_tmpdir/scmroot/rust-aom-sys
Cloning into '/var/lib/mock/f40-build-2658103-66917/root/chroot_tmpdir/scmroot/rust-aom-sys'...
$ git fetch origin d256f3e4f32f383b268c86a181d1806789bd5fac:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-aom-sys
 * [new ref]         d256f3e4f32f383b268c86a181d1806789bd5fac -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d256f3e Update to version 0.3.3; Fixes RHBZ#2256078