$ git clone -n https://src.fedoraproject.org/rpms/NLopt.git /var/lib/mock/f40-build-2068360-49293/root/chroot_tmpdir/scmroot/NLopt
Cloning into '/var/lib/mock/f40-build-2068360-49293/root/chroot_tmpdir/scmroot/NLopt'...
$ git fetch origin 307295598dffda12c2d3586bfae6d5d4883e3b33:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/NLopt
 * [new ref]         307295598dffda12c2d3586bfae6d5d4883e3b33 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3072955 Fix flatpak build