$ git clone -n https://src.fedoraproject.org/rpms/glib2.git /var/lib/mock/f41-build-side-1-2646705-27247/root/chroot_tmpdir/scmroot/glib2
Cloning into '/var/lib/mock/f41-build-side-1-2646705-27247/root/chroot_tmpdir/scmroot/glib2'...
$ git fetch origin 9018fa2765eb46a14c2d33eb9778224f2a5df20c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/glib2
 * [new ref]         9018fa2765eb46a14c2d33eb9778224f2a5df20c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9018fa2 Update to 2.82.0