$ git clone -n https://src.fedoraproject.org/rpms/rust-scc.git /var/lib/mock/f42-build-side-1-3512295-46067/root/chroot_tmpdir/scmroot/rust-scc
Cloning into '/var/lib/mock/f42-build-side-1-3512295-46067/root/chroot_tmpdir/scmroot/rust-scc'...
$ git fetch origin e42a6cd6dee11b58b98dcee8f1be1cf140d278ad:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-scc
 * [new ref]         e42a6cd6dee11b58b98dcee8f1be1cf140d278ad -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e42a6cd Update to version 2.3.3; Fixes RHBZ#2332582