$ git clone -n https://src.fedoraproject.org/rpms/rust-rav1e.git /var/lib/mock/f38-build-side-43-rust-devel-1416569-31457/root/chroot_tmpdir/scmroot/rust-rav1e
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1416569-31457/root/chroot_tmpdir/scmroot/rust-rav1e'...
$ git fetch origin 08379252dcac50b7bc0c44abc6ca03a299f171ca:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rav1e
 * [new ref]         08379252dcac50b7bc0c44abc6ca03a299f171ca -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0837925 Migrate to new cargo_cbuild and cargo_cinstall macros