$ git clone -n https://src.fedoraproject.org/rpms/wxGTK.git /var/lib/mock/f39-build-1601914-38564/root/chroot_tmpdir/scmroot/wxGTK
Cloning into '/var/lib/mock/f39-build-1601914-38564/root/chroot_tmpdir/scmroot/wxGTK'...
$ git fetch origin fe80f5f50e1d2746e5123076548d922d1f7f58a2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/wxGTK
 * [new ref]         fe80f5f50e1d2746e5123076548d922d1f7f58a2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fe80f5f Make wxGetLinuxDistributionInfo work without lsb_release (#2184391)