rosenthal: Add python-pynixutil.

* rosenthal/packages/python-xyz.scm: New file.
(python-pynixutil): New variable.

rosenthal/packages/python-xyz.scm

@@ -0,0 +1,39 @@
+;; SPDX-FileCopyrightText: 2022 Hilton Chain <hako@ultrarare.space>
+;;
+;; SPDX-License-Identifier: GPL-3.0-or-later
+
+(define-module (rosenthal packages python-xyz)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (guix build-system pyproject)
+  #:use-module (guix git-download)
+  #:use-module (guix packages)
+  #:use-module (gnu packages check)
+  #:use-module (gnu packages python-build)
+  #:use-module (gnu packages python-xyz))
+
+;; https://debbugs.gnu.org/cgi/bugreport.cgi?bug=59270
+(define-public python-pynixutil
+  (package
+    (name "python-pynixutil")
+    (version "0.5.0")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/nix-community/pynixutil")
+                    (commit version)))
+              (file-name (git-file-name name version))
+              ;; Derivation test uses nix.
+              (modules '((guix build utils)))
+              (snippet '(delete-file "tests/test_drv.py"))
+              (sha256
+               (base32
+                "1lnspcai7mqpv73bbd8kgyw63fxwgkwvfkl09b2bl5y2g2v7np6m"))))
+    (build-system pyproject-build-system)
+    (native-inputs (list poetry python-pytest))
+    (home-page "https://github.com/nix-community/pynixutil")
+    (synopsis "Utility functions for working with data from Nix in Python")
+    (description
+     "@code{pynixutil} provides functions for base32 encoding/decoding and
+derivation parsing, namingly @code{b32decode()}, @code{b32encode()} and
+@code{drvparse()}.")
+    (license license:expat)))