$ git clone -n https://src.fedoraproject.org/rpms/rust-scc.git /var/lib/mock/f42-build-side-1-3581448-46829/root/chroot_tmpdir/scmroot/rust-scc
Cloning into '/var/lib/mock/f42-build-side-1-3581448-46829/root/chroot_tmpdir/scmroot/rust-scc'...
$ git fetch origin 3748fd4c893cc1c7d48fd9cab4284a71043da582:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-scc
 * [new ref]         3748fd4c893cc1c7d48fd9cab4284a71043da582 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3748fd4 Update to version 2.3.4; Fixes RHBZ#2361143