$ git clone -n https://src.fedoraproject.org/rpms/kde-gtk-config.git /var/lib/mock/f40-build-2048990-49010/root/chroot_tmpdir/scmroot/kde-gtk-config
Cloning into '/var/lib/mock/f40-build-2048990-49010/root/chroot_tmpdir/scmroot/kde-gtk-config'...
$ git fetch origin 9715ee4abbca074cbfce90ccac0e1dcb7c4886d6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kde-gtk-config
 * [new ref]         9715ee4abbca074cbfce90ccac0e1dcb7c4886d6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9715ee4 fix: rebuild