$ git clone -n https://src.fedoraproject.org/rpms/gnome-desktop3.git /var/lib/mock/f40-build-2722520-73094/root/chroot_tmpdir/scmroot/gnome-desktop3
Cloning into '/var/lib/mock/f40-build-2722520-73094/root/chroot_tmpdir/scmroot/gnome-desktop3'...
$ git fetch origin 5739e1641625f671ab8cb2236032f14f63e48879:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-desktop3
 * [new ref]         5739e1641625f671ab8cb2236032f14f63e48879 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5739e16 Convert subpackages to SPDX license format