$ git clone -n https://src.fedoraproject.org/rpms/classpathless-compiler.git /var/lib/mock/f40-build-2184842-51282/root/chroot_tmpdir/scmroot/classpathless-compiler
Cloning into '/var/lib/mock/f40-build-2184842-51282/root/chroot_tmpdir/scmroot/classpathless-compiler'...
$ git fetch origin b1e96ba7f355516f821aca9408b37e0c589aab45:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/classpathless-compiler
 * [new ref]         b1e96ba7f355516f821aca9408b37e0c589aab45 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b1e96ba Build with Jurand instead of deprecated javapackages-extra