$ git clone -n https://src.fedoraproject.org/rpms/rust-names.git /var/lib/mock/f40-build-781149-131430/root/chroot_tmpdir/scmroot/rust-names
Cloning into '/var/lib/mock/f40-build-781149-131430/root/chroot_tmpdir/scmroot/rust-names'...
$ git fetch origin 5624c0c05b2fa9c51f32be7e500b9dc2a115fd02:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-names
 * [new ref]         5624c0c05b2fa9c51f32be7e500b9dc2a115fd02 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5624c0c Initial import; Fixes: RHBZ#2263714