$ git clone -n https://src.fedoraproject.org/rpms/rust-bencher.git /var/lib/mock/f45-build-40458-772/root/chroot_tmpdir/scmroot/rust-bencher
Cloning into '/var/lib/mock/f45-build-40458-772/root/chroot_tmpdir/scmroot/rust-bencher'...
$ git fetch origin 190fa92aa78d3524f1e9a06610e2b2b0c9353147:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-bencher
 * [new ref]         190fa92aa78d3524f1e9a06610e2b2b0c9353147 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 190fa92 Regenerate with rust2rpm v28