$ git clone -n https://src.fedoraproject.org/rpms/cramjam-cli.git /var/lib/mock/f40-build-798893-142040/root/chroot_tmpdir/scmroot/cramjam-cli
Cloning into '/var/lib/mock/f40-build-798893-142040/root/chroot_tmpdir/scmroot/cramjam-cli'...
$ git fetch origin 3c64fe42b927e1a3814170a9dafecc0fc177d118:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cramjam-cli
 * [new ref]         3c64fe42b927e1a3814170a9dafecc0fc177d118 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3c64fe4 Initial package (close RHBZ#2264463)