$ git clone -n https://src.fedoraproject.org/rpms/pygobject3.git /var/lib/mock/f42-build-side-1-3540443-46574/root/chroot_tmpdir/scmroot/pygobject3
Cloning into '/var/lib/mock/f42-build-side-1-3540443-46574/root/chroot_tmpdir/scmroot/pygobject3'...
$ git fetch origin 2d5dba5888e2a8cebac1dc9f562d2fb289765193:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pygobject3
 * [new ref]         2d5dba5888e2a8cebac1dc9f562d2fb289765193 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2d5dba5 Update to 3.51.0