$ git clone -n https://src.fedoraproject.org/rpms/gns3-server.git /var/lib/mock/f40-build-1463758-23595/root/chroot_tmpdir/scmroot/gns3-server
Cloning into '/var/lib/mock/f40-build-1463758-23595/root/chroot_tmpdir/scmroot/gns3-server'...
$ git fetch origin 8f812490acefa9b8a1bef9ccd310dc6d7883ce20:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gns3-server
 * [new ref]         8f812490acefa9b8a1bef9ccd310dc6d7883ce20 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8f81249 Update to 2.2.48