With the http redirection that fog is currently using, its a bit difficult to host other files under the http protocol.
So what can you do?
Move to one of the other supported protocols like tftp:// or nfs://
To use the tftp:// protocol you would update your menu to be something like this (note I fixed your fetch kernel parameter too).
kernel tftp://${fog-ip}/iso/gparted/live/vmlinuz vmlinuz boot=live config components union=overlay username=user noswap noeject ip= vga=788 fetch=tftp://${fog-ip}/iso/gparted/live/filesystem.squashfs
initrd tftp://${fog-ip}/iso/gparted/live/initrd.img
The only thing I’m unsure of is if the kernel supports tftp pulling. Also the variable ${fog-ip}
is replaced by the fog menu with the IP address of your fog server. Hard coding the IP address in the fog menu doesn’t make it very portable.
So since we are using tftp://
protocol you need to place the files in /tftpboot/iso/gparted based directory.
If that doesn’t work then you could try nfs:// which should be supported by the linux kernel.