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-rw-r--r--doc/guix.texi18
-rw-r--r--guix/scripts/graph.scm19
-rw-r--r--tests/graph.scm28
3 files changed, 62 insertions, 3 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index 94d7a29bdf..8fa714ee54 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -9290,7 +9290,9 @@ This shows the @emph{reverse} DAG of packages. For example:
guix graph --type=reverse-package ocaml
@end example
-...@: yields the graph of packages that depend on OCaml.
+...@: yields the graph of packages that @emph{explicitly} depend on OCaml (if
+you are also interested in cases where OCaml is an implicit dependency, see
+@code{reverse-bag} below.)
Note that for core packages this can yield huge graphs. If all you want
is to know the number of packages that depend on a given package, use
@@ -9324,6 +9326,20 @@ dependencies.
@item bag-with-origins
Similar to @code{bag}, but also showing origins and their dependencies.
+@item reverse-bag
+This shows the @emph{reverse} DAG of packages. Unlike @code{reverse-package},
+it also takes implicit dependencies into account. For example:
+
+@example
+guix graph -t reverse-bag dune
+@end example
+
+@noindent
+...@: yields the graph of all packages that depend on Dune, directly or
+indirectly. Since Dune is an @emph{implicit} dependency of many packages
+@i{via} @code{dune-build-system}, this shows a large number of packages,
+whereas @code{reverse-package} would show very few if any.
+
@item derivation
This is the most detailed representation: It shows the DAG of
derivations (@pxref{Derivations}) and plain store items. Compared to
diff --git a/guix/scripts/graph.scm b/guix/scripts/graph.scm
index 8efeef3274..d0d353ff9e 100644
--- a/guix/scripts/graph.scm
+++ b/guix/scripts/graph.scm
@@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -43,6 +43,7 @@
%bag-node-type
%bag-with-origins-node-type
%bag-emerged-node-type
+ %reverse-bag-node-type
%derivation-node-type
%reference-node-type
%referrer-node-type
@@ -219,6 +220,21 @@ GNU-BUILD-SYSTEM have zero dependencies."
bag-node-edges-sans-bootstrap)
%store-monad))))
+(define %reverse-bag-node-type
+ ;; Type for the reverse traversal of package nodes via the "bag"
+ ;; representation, which includes implicit inputs.
+ (let* ((packages (delay (package-closure (fold-packages cons '()))))
+ (back-edges (delay (run-with-store #f ;store not actually needed
+ (node-back-edges %bag-node-type
+ (force packages))))))
+ (node-type
+ (name "reverse-bag")
+ (description "the reverse DAG of packages, including implicit inputs")
+ (convert nodes-from-package)
+ (identifier bag-node-identifier)
+ (label node-full-name)
+ (edges (lift1 (force back-edges) %store-monad)))))
+
;;;
;;; Derivation DAG.
@@ -375,6 +391,7 @@ package modules, while attempting to retain user package modules."
%bag-node-type
%bag-with-origins-node-type
%bag-emerged-node-type
+ %reverse-bag-node-type
%derivation-node-type
%reference-node-type
%referrer-node-type
diff --git a/tests/graph.scm b/tests/graph.scm
index 4799d3bd0c..c4c5096226 100644
--- a/tests/graph.scm
+++ b/tests/graph.scm
@@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -191,6 +191,32 @@ edges."
(string=? target (derivation-file-name g)))))
edges)))))))))
+(test-assert "reverse bag DAG"
+ (let-values (((dune bap ocaml-base)
+ (values (specification->package "dune")
+ (specification->package "bap")
+ (specification->package "ocaml-base")))
+ ((backend nodes+edges) (make-recording-backend)))
+ (run-with-store %store
+ (export-graph (list dune) 'port
+ #:node-type %reverse-bag-node-type
+ #:backend backend))
+
+ (run-with-store %store
+ (mlet %store-monad ((dune-drv (package->derivation dune))
+ (bap-drv (package->derivation bap))
+ (ocaml-base-drv (package->derivation ocaml-base)))
+ ;; OCAML-BASE uses 'dune-build-system' so DUNE is a direct dependency.
+ ;; BAP is much higher in the stack but it should be there.
+ (let-values (((nodes edges) (nodes+edges)))
+ (return
+ (and (member `(,(derivation-file-name bap-drv)
+ ,(package-full-name bap))
+ nodes)
+ (->bool (member (map derivation-file-name
+ (list dune-drv ocaml-base-drv))
+ edges)))))))))
+
(test-assert "derivation DAG"
(let-values (((backend nodes+edges) (make-recording-backend)))
(run-with-store %store