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authorLudovic Courtès <ludo@gnu.org>2022-03-11 22:15:47 +0100
committerLudovic Courtès <ludo@gnu.org>2022-03-18 16:03:33 +0100
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guix home: Implement the 'extension-graph' and 'shepherd-graph' actions.
Until now these two actions were silently ignored. * guix/scripts/home.scm (show-help, %options): Add "--graph-backend". (%default-options): Add 'graph-backend' key. (export-extension-graph, export-shepherd-graph): New procedures. (perform-action): Add #:graph-backend parameter. Add cases for the 'extension-graph' and 'shepherd-graph' actions. (process-action): Pass #:graph-backend to 'perform-action'. * guix/scripts/system.scm (service-node-type) (shepherd-service-node-type): Export * tests/guix-home.sh: Add tests. * doc/guix.texi (Invoking guix home): Document it.
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@@ -38848,7 +38848,38 @@ environment. Note that not every home service that exists is supported
$ guix home import ~/guix-config
guix home: '/home/alice/guix-config' populated with all the Home configuration files
@end example
+@end table
+
+And there's more! @command{guix home} also provides the following
+sub-commands to visualize how the services of your home environment
+relate to one another:
+
+@table @code
+@cindex service extension graph, of a home environment
+@item extension-graph
+Emit to standard output the @dfn{service extension graph} of the home
+environment defined in @var{file} (@pxref{Service Composition}, for more
+information on service extensions). By default the output is in
+Dot/Graphviz format, but you can choose a different format with
+@option{--graph-backend}, as with @command{guix graph} (@pxref{Invoking
+guix graph, @option{--backend}}):
+
+The command:
+
+@example
+guix home extension-graph @var{file} | xdot -
+@end example
+
+shows the extension relations among services.
+@cindex Shepherd dependency graph, for a home environment
+@item shepherd-graph
+Emit to standard output the @dfn{dependency graph} of shepherd services
+of the home environment defined in @var{file}. @xref{Shepherd
+Services}, for more information and for an example graph.
+
+Again, the default output format is Dot/Graphviz, but you can pass
+@option{--graph-backend} to select a different one.
@end table
@var{options} can contain any of the common build options (@pxref{Common