Generate ESXi-compatible virtual appliance

patch-appliance-esxi.nix

pkgs.runCommand "fix-appliance-esxi" {}                                                                              
      ''                                                                                                               
        mkdir $out                                                                                                     
        mkdir ova                                                                                                      
        pushd ova                                                                                                      
        echo "Tar command: tar -xvf ${vboxImage}/*.ova"                                                                
        tar -xvf ${vboxImage}/*.ova                                                                                    
                                                                                                                       
        ovf=$(ls -1 *.ovf)                                                                                             
        mf=$(ls -1 *.mf)                                                                                               
        vmdk=$(ls -1 *.vmdk)                                                                                           
                                                                                                                       
        sed 's;\(.*<vssd:VirtualSystemType>\).*\(</vssd:VirtualSystemType>\);\1vmx-14\2;;' -i nixos-20.09pre-git-x86_64-linux.ovf                                                                                                             
        sum=$(sha1sum $ovf | cut -d ' ' -f-1)                                                                          
        substituteInPlace $mf --replace "SHA1 ($ovf) = .*" "SHA1 ($ovf) = $sum"                                        
        tar -cvf nixos.ova $ovf $mf $vmdk                                                                              
        cp nixos.ova $out                                                                                              
    '';