$ git clone -n https://src.fedoraproject.org/rpms/maven-dependency-tree.git /var/lib/mock/f40-build-2153543-50914/root/chroot_tmpdir/scmroot/maven-dependency-tree
Cloning into '/var/lib/mock/f40-build-2153543-50914/root/chroot_tmpdir/scmroot/maven-dependency-tree'...
$ git fetch origin 642d4cc47485f64adb61c85a1d2c4de5227d7ecb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/maven-dependency-tree
 * [new ref]         642d4cc47485f64adb61c85a1d2c4de5227d7ecb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 642d4cc Update javapackages test plan to f40