gnu: piranha: Update to 1.2.1.

* gnu/packages/bioinformatics.scm (piranha): Update to 1.2.1.

gnu/packages/bioinformatics.scm

@@ -5127,17 +5127,21 @@ libraries for systems that do not have these available via other means.")
     (license license:artistic2.0)))
 
 (define-public piranha
+  ;; There is no release tarball for the latest version.  The latest commit is
+  ;; older than one year at the time of this writing.
+  (let ((revision "1")
+        (commit   "0466d364b71117d01e4471b74c514436cc281233"))
     (package
       (name "piranha")
-    (version "1.1.3")
+      (version (string-append "1.2.1-" revision "." (string-take commit 9)))
       (source (origin
-              (method url-fetch)
-              (uri (string-append "https://github.com/smithlabcode/piranha"
-                                  "/archive/svn/tags/piranha-"
-                                  version ".tar.gz"))
+                (method git-fetch)
+                (uri (git-reference
+                      (url "https://github.com/smithlabcode/piranha.git")
+                      (commit commit)))
                 (sha256
                  (base32
-                "1lczxff01n4139w7xwqamlb36g9hgrcy93gh03nqszhwb8ivsrqd"))))
+                  "117dc0zf20c61jam69sk4abl57ah6yi6i7qra7d7y5zrbgk12q5n"))))
       (build-system gnu-build-system)
       (arguments
        `(#:test-target "test"
@@ -5145,7 +5149,6 @@ libraries for systems that do not have these available via other means.")
          (modify-phases %standard-phases
            (add-after 'unpack 'copy-smithlab-cpp
              (lambda* (#:key inputs #:allow-other-keys)
-             (mkdir "src/smithlab_cpp")
                (for-each (lambda (file)
                            (install-file file "./src/smithlab_cpp/"))
                          (find-files (assoc-ref inputs "smithlab-cpp")))
@@ -5188,7 +5191,7 @@ libraries for systems that do not have these available via other means.")
 RIP-seq experiments.  It takes input in BED or BAM format and identifies
 regions of statistically significant read enrichment.  Additional covariates
 may optionally be provided to further inform the peak-calling process.")
-    (license license:gpl3+)))
+      (license license:gpl3+))))
 
 (define-public pepr
   (package