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Le samedi 14 janvier 2023 =C3=A0 21:10 +0100, Csepp a =C3=A9crit=C2=A0: > The way I debugged a cycle was: > * use package graph type > * import graph into Python's networkx using pydot > * run networkx's cycle detection If I select the "package" graph type, guix graph completes: $ ./pre-inst-env guix graph --type=3Dpackage p11-kit digraph "Guix package" { "140299993452720" [label =3D "p11-kit@0.23.22", shape =3D box, fontname = =3D sans]; "140299993452720" -> "140299993453072" [color =3D magenta]; "140299993452720" -> "140300286436736" [color =3D magenta]; "140299993452720" -> "140299980957936" [color =3D magenta]; "140299993452720" -> "140299993453072" [color =3D magenta]; "140299993453072" [label =3D "libtasn1@4.17.0", shape =3D box, fontname = =3D sans]; "140299993453072" -> "140299983720224" [color =3D blue]; "140299983720224" [label =3D "perl@5.34.0", shape =3D box, fontname =3D sans]; "140299983720224" -> "140299983567616" [color =3D red]; "140299983567616" [label =3D "coreutils-minimal@8.32", shape =3D box, fontname =3D sans]; "140300286436736" [label =3D "pkg-config@0.29.2", shape =3D box, fontname =3D sans]; "140299980957936" [label =3D "libffi@3.3", shape =3D box, fontname =3D sans]; } Thank you for your python script! Unfortunately, it does not detect any cycles here. Vivien