gnu: Add go-github-com-rifflock-lfshook.

* gnu/packages/golang.scm (go-github-com-rifflock-lfshook): New variable.

gnu/packages/golang.scm

@@ -1181,6 +1181,31 @@ (define-public go-github-com-sirupsen-logrus
 compatible with the standard library logger.")
     (license license:expat)))
 
+(define-public go-github-com-rifflock-lfshook
+  (package
+    (name "go-github-com-rifflock-lfshook")
+    (version "2.4")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/rifflock/lfshook.git")
+                    (commit (string-append "v" version))))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "0wxqjcjfg8c0klmdgmbw3ckagby3wg9rkga9ihd4fsf05x5scxrc"))))
+    (build-system go-build-system)
+    (arguments
+     `(#:import-path "github.com/rifflock/lfshook"))
+    (propagated-inputs
+     `(("go-github-com-sirupsen-logrus" ,go-github-com-sirupsen-logrus)))
+    (home-page "https://github.com/rifflock/lfshook")
+    (synopsis "Local File System hook for Logrus logger")
+    (description "This package provides a hook for Logrus to write directly to
+a file on the filesystem.  The log levels are dynamic at instantiation of the
+hook, so it is capable of logging at some or all levels.")
+    (license license:expat)))
+
 (define-public go-github-com-kardianos-osext
   (let ((commit "ae77be60afb1dcacde03767a8c37337fad28ac14")
         (revision "1"))