$ git clone -n https://src.fedoraproject.org/rpms/libglpng.git /var/lib/mock/f41-build-1266646-23069/root/chroot_tmpdir/scmroot/libglpng
Cloning into '/var/lib/mock/f41-build-1266646-23069/root/chroot_tmpdir/scmroot/libglpng'...
$ git fetch origin f66f134fa0df28c0967309fe3af51f4f45911ce1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libglpng
 * [new ref]         f66f134fa0df28c0967309fe3af51f4f45911ce1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f66f134 Eliminate use of obsolete %patchN syntax (#2283636)