$ git clone -n https://src.fedoraproject.org/rpms/pygobject2.git /var/lib/mock/f41-build-side-1-3134480-39756/root/chroot_tmpdir/scmroot/pygobject2
Cloning into '/var/lib/mock/f41-build-side-1-3134480-39756/root/chroot_tmpdir/scmroot/pygobject2'...
$ git fetch origin 9249fb1df02c7a78b8dfd875a7495e8a15cae0ed:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pygobject2
 * [new ref]         9249fb1df02c7a78b8dfd875a7495e8a15cae0ed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9249fb1 https://fedoraproject.org/wiki/Changes/RetirePython2.7