$ git clone -n https://src.fedoraproject.org/rpms/pygtk2.git /var/lib/mock/f41-build-side-1-3134482-39756/root/chroot_tmpdir/scmroot/pygtk2
Cloning into '/var/lib/mock/f41-build-side-1-3134482-39756/root/chroot_tmpdir/scmroot/pygtk2'...
$ git fetch origin 33a79f7e96231c98a2fef9d5199a0cade5f95594:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pygtk2
 * [new ref]         33a79f7e96231c98a2fef9d5199a0cade5f95594 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 33a79f7 https://fedoraproject.org/wiki/Changes/RetirePython2.7