$ git clone -n https://src.fedoraproject.org/rpms/glib2.git /var/lib/mock/f41-build-842731-161699/root/chroot_tmpdir/scmroot/glib2
Cloning into '/var/lib/mock/f41-build-842731-161699/root/chroot_tmpdir/scmroot/glib2'...
$ git fetch origin 9ec182aa21174a7b10705afa32d1e08630602219:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/glib2
 * [new ref]         9ec182aa21174a7b10705afa32d1e08630602219 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9ec182a Update to 2.81.1