GNU Guix diagram

[myglc2 <myglc2@gmail.com>]

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Upon installing GuixSD a month ago I found it difficult to get a grip on
GNU Guix' stucture. Because I like pictures I made a diagram showing
what I think I now understand about how GNU Guix' works. I am thinking
it might be helpful to Guix newcomers. Comments &/or corrections would
be most welcome. - George

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// Overview of GNU Guix
digraph G {
	compound=true
	size="12,12"
	edge [fontname = helvetica]
	graph [fontname = helvetica]
	node  [fontname = helvetica]
	{ node [shape=box style = filled fillcolor="white" color = transparent]
		pkgsource [label = "Source"]
		substitutes [label = "Prebuilt\nPackage"]
	}
	{ node [shape=box style = filled fillcolor=pink color = transparent]		
		spkgs [label = "System Packages\nInstall: 'sudo guix system reconfigure CONFIG.scm'\nUpdate: 'sudo guix pull && guix system reconfigure CONFIG.scm'"]
	}
	{ node [shape=box style ="filled,rounded" fillcolor=pink color = transparent]		
		guixd [label = " guix-daemon "]
	}
	{ node [shape=box style ="filled,rounded" fillcolor=lightblue color = transparent]		
		user1 [label = "user1"]
	}
	{ node [shape=box style ="filled" fillcolor=lightblue color = transparent]		
		u1pkgs [label = "user1 Packages\nInstall: 'guix package -i PACKAGE'\nUpdate: 'guix pull'"]
		guix2 [label="user1 guix\nUpdate: 'guix pull'"]
	}
	subgraph cluster_pkgsource {
		label = "Developer"
		labelloc = "t"
		style = filled fillcolor= azure2 color = transparent
		pkgsource
	}
	subgraph cluster_hydra {
		label = "Guix  Hydra"
		style = filled fillcolor= azure2 color = transparent
		substitutes
	}
	subgraph cluster_guixSD {
		label = "Computer Running GNU Guix"
		labelloc = "t"
		style = filled fillcolor= azure2 color = transparent
		user1 -> spkgs  [ label = " /run/current-system/profile  "]
		user1 -> guix2  [ label = " ~/.config/guix/latest  " ]
		user1 -> u1pkgs  [ label = " ~/.guix-profile  " ]
		subgraph cluster_guixstore {
			label = "Guix Package Store /gnu/store"
			labelloc = "b"
			style = filled fillcolor= tan color = transparent
			u1pkgs
			guix2
			spkgs
		}
		guixd
		spkgs -> guixd  [dir = back ltail=cluster_guixstore ]
	}
	pkgsource -> substitutes [lhead=cluster_hydra ltail=cluster_pkgsource]
	pkgsource -> guixd [ltail=cluster_pkgsource]
	substitutes -> guixd [ltail=cluster_hydra]
}

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