$ git clone -n https://src.fedoraproject.org/rpms/gtk+extra.git /var/lib/mock/f41-build-1146588-21197/root/chroot_tmpdir/scmroot/gtk+extra
Cloning into '/var/lib/mock/f41-build-1146588-21197/root/chroot_tmpdir/scmroot/gtk+extra'...
$ git fetch origin 3243f873ac0140d145eecea7e250f9eaa1722b9c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gtk+extra
 * [new ref]         3243f873ac0140d145eecea7e250f9eaa1722b9c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3243f87 Eliminate use of obsolete %patchN syntax (#2283636)