gnu: Add reprotest.

Added to diffoscope, to avoid triggering #37346.

* gnu/packages/diffoscope (reprotest): New variable.
* gnu/packages/patches/reprotest-support-guix.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add patch.

gnu/packages/diffoscope.scm

@@ -44,6 +44,7 @@
   #:use-module (gnu packages java)
   #:use-module (gnu packages linux)
   #:use-module (gnu packages llvm)
+  #:use-module (gnu packages man)
   #:use-module (gnu packages mono)
   #:use-module (gnu packages ocaml)
   #:use-module (gnu packages package-management)
@@ -224,6 +225,73 @@ Diffoscope has many optional dependencies; @code{diffoscope
 install.")
       (license license:gpl3+))))
 
+(define-public reprotest
+  (package
+    (name "reprotest")
+    (version "0.7.13")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://salsa.debian.org/reproducible-builds/reprotest.git")
+             (commit version)))
+       (file-name (git-file-name name version))
+       (patches (search-patches "reprotest-support-guix.patch"))
+       (sha256
+        (base32
+         "0jj9sqxbdpypnc0y8md352wwzh1by6nyhmx5fwqnvrbznrng332f"))))
+    (inputs
+     `(("python-debian" ,python-debian)
+       ("python-distro" ,python-distro)
+       ("python-libarchive-c", python-libarchive-c)
+       ("python-rstr" ,python-rstr)))
+    (native-inputs
+     `(("diffoscope" ,diffoscope)
+       ("help2man" ,help2man)
+       ("libfaketime" ,libfaketime)
+       ("python-coverage" ,python-coverage)
+       ("python-docutils" ,python-docutils)
+       ("python-pytest " ,python-pytest)
+       ("python-tlsh" ,python-tlsh)
+       ("python-tox" ,python-tox)
+       ("unzip" ,unzip)
+       ("xxd" ,xxd)))
+    (build-system python-build-system)
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         ;; Neither glibc-locales nor glibc-utf8-locales have the C.UTF-8
+         ;; locale or several other locales used in reprotest.
+         (add-after 'unpack 'adjust-locales
+           (lambda _
+             (substitute* "reprotest/build.py"
+               (("'C.UTF-8'") "'en_US.UTF-8'")
+               (("'ru_RU.CP1251'") "'ru_RU.KOI8-R'")
+               (("'kk_KZ.RK1048'") "'kk_KZ'"))
+             (substitute* "reprotest/lib/adt_testbed.py"
+               (("export LANG=C.UTF-8") "export LANG=en_US.UTF-8"))
+             #t))
+         (add-after 'install 'install-doc
+           (lambda* (#:key outputs #:allow-other-keys)
+             (let* ((mandir1 (string-append
+                              (assoc-ref outputs "out") "/share/man/man1"))
+                    (docdir (string-append
+                             (assoc-ref outputs "out") "/share/doc/" ,name "-" ,version)))
+               (invoke "make" "-C" "doc")
+               (mkdir-p mandir1)
+               (install-file "doc/reprotest.1" mandir1)
+               (mkdir-p docdir)
+               (install-file "./README.rst" docdir)
+               (install-file "./README-dev.rst" docdir))
+             #t)))))
+    (home-page "https://salsa.debian.org/reproducible-builds/reprotest")
+    (synopsis "Build software and check it for reproducibility")
+    (description "Reprotest builds the same source code twice in different
+environments, and then checks the binaries produced by each build for
+differences.  If any are found, then diffoscope or diff is used to display
+them in detail for later analysis.")
+    (license (list license:gpl3+ license:gpl2+))))
+
 (define-public trydiffoscope
  (package
    (name "trydiffoscope")