$ git clone -n https://src.fedoraproject.org/rpms/GeographicLib.git /var/lib/mock/f39-build-1565598-37580/root/chroot_tmpdir/scmroot/GeographicLib
Cloning into '/var/lib/mock/f39-build-1565598-37580/root/chroot_tmpdir/scmroot/GeographicLib'...
$ git fetch origin 54b4624a94c96a6490c7b78a9e50b35a552a0197:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/GeographicLib
 * [new ref]         54b4624a94c96a6490c7b78a9e50b35a552a0197 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 54b4624 Update sources