$ git clone -n https://src.fedoraproject.org/rpms/rust-ahash0.4.git /var/lib/mock/f40-build-2060982-49167/root/chroot_tmpdir/scmroot/rust-ahash0.4
Cloning into '/var/lib/mock/f40-build-2060982-49167/root/chroot_tmpdir/scmroot/rust-ahash0.4'...
$ git fetch origin fc57cbe952f3aa20fa9a857d238a740e384fd80c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-ahash0.4
 * [new ref]         fc57cbe952f3aa20fa9a857d238a740e384fd80c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fc57cbe Update to version 0.4.8