Provide a Guix channel

.guix-channel

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+(channel
+ (version 0)
+ (url "https://git.datat.fi/ry/datat.fi.git")
+ (directory ".guix/modules"))

.guix/modules/datat-website-package.scm

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+(define-module (datat-website-package)
+  #:use-module (guix)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (guix git-download)
+  #:use-module (guix packages)
+  #:use-module (guix build-system ruby)
+  #:use-module (gnu packages ruby))
+
+(define vcs-file?
+  (or (git-predicate (string-append (current-source-directory) "/../.."))
+      (const #t)))
+
+(define-public datat.fi-website
+  (package
+    (name "datat.fi-website")
+    (version "0.0.0")
+    (source (local-file "../.." "datat.fi-website-checkout"
+                        #:recursive? #t
+                        #:select? vcs-file?))
+    (build-system ruby-build-system)
+    (arguments
+      (list
+        #:tests? #f
+        #:phases
+        #~(modify-phases %standard-phases
+            (add-after 'build 'build-html
+              (lambda _
+                (setenv "JEKYLL_ENV" "production")
+                (invoke "jekyll" "build")))
+            (replace 'install
+              (lambda _
+                (map delete-file (find-files "_site" "\\.gem(spec)?$|\\.scm$"))
+                (copy-recursively "_site" (string-append #$output "/srv/datat.fi-website/"))))))) ; no tests
+    (native-inputs
+      (list
+        jekyll
+        ruby-jekyll-feed
+        ruby-jekyll-paginate
+        ruby-jekyll-seo-tag
+        ruby-jekyll-sitemap))
+    (synopsis "Datat.fi website")
+    (description "HTML site on https://datat.fi")
+    (home-page "https://git.datat.fi/ry/datat.fi")
+    (license license:expat)))
+
+(define ruby-jekyll-paginate
+  (package
+    (name "ruby-jekyll-paginate")
+    (version "1.1.0")
+    (source (origin
+              (method url-fetch)
+              (uri (rubygems-uri "jekyll-paginate" version))
+              (sha256
+               (base32
+                "0r7bcs8fq98zldih4787zk5i9w24nz5wa26m84ssja95n3sas2l8"))))
+    (build-system ruby-build-system)
+    (arguments
+      (list
+        #:tests? #f)) ; no tests
+    (synopsis "Built-in Pagination Generator for Jekyll")
+    (description "Built-in Pagination Generator for Jekyll")
+    (home-page "https://github.com/jekyll/jekyll-paginate")
+    (license license:expat)))
+
+datat.fi-website

guix.scm

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+.guix/modules/datat-website-package.scm