$ git clone -n https://src.fedoraproject.org/rpms/rust-rav1e.git /var/lib/mock/f40-build-781348-131566/root/chroot_tmpdir/scmroot/rust-rav1e
Cloning into '/var/lib/mock/f40-build-781348-131566/root/chroot_tmpdir/scmroot/rust-rav1e'...
$ git fetch origin 46d7c6da47226359c1a1d9bcd7d598de0070028d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rav1e
 * [new ref]         46d7c6da47226359c1a1d9bcd7d598de0070028d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 46d7c6d update to version 0.7.1; Fixes RHBZ#2256283