gnu: beets: Update to 1.3.18.

* gnu/packages/patches/beets-image-test-failure.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/music.scm (beets): Update to 1.3.18.
[source]: Use patch.

gnu/local.mk

@@ -442,6 +442,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/avrdude-fix-libusb.patch			\
   %D%/packages/patches/awesome-reproducible-png.patch		\
   %D%/packages/patches/bash-completion-directories.patch	\
+  %D%/packages/patches/beets-image-test-failure.patch		\
   %D%/packages/patches/bigloo-gc-shebangs.patch			\
   %D%/packages/patches/binutils-ld-new-dtags.patch		\
   %D%/packages/patches/binutils-loongson-workaround.patch	\

gnu/packages/music.scm

@@ -1474,13 +1474,17 @@ websites such as Libre.fm.")
 (define-public beets
   (package
     (name "beets")
-    (version "1.3.17")
+    (version "1.3.18")
     (source (origin
               (method url-fetch)
-              (uri (pypi-uri name version))
+              (uri (string-append
+                     "https://pypi.python.org/packages/"
+                     "14/6f/c9c79c5339ab3ecced265ca18adbf5bae3d4058bae737b6164d738fb4d2c/"
+                     name "-" version ".tar.gz"))
+              (patches (search-patches "beets-image-test-failure.patch"))
               (sha256
                (base32
-                "0yg7sp18sdpszkinhb0bi6yinbn316jy1baxrwiw0m4byrj3rr6c"))))
+                "09pgyywa5llbc36y0lrr21ywgsp8m2zx6p8ncf8hxik28knd5kld"))))
     (build-system python-build-system)
     (arguments
      `(#:python ,python-2 ; only Python 2 is supported

gnu/packages/patches/beets-image-test-failure.patch

@@ -0,0 +1,46 @@
+Fix test failure due to missing image library backend.
+
+Cherry-picked from upstream:
+https://github.com/beetbox/beets/commit/07c95a1bf16bf86c640436208dda828cc7df0181
+
+From 07c95a1bf16bf86c640436208dda828cc7df0181 Mon Sep 17 00:00:00 2001
+From: Adrian Sampson <adrian@radbox.org>
+Date: Thu, 2 Jun 2016 11:39:05 -0700
+Subject: [PATCH] Require an imaging backend for fuzzy ratio tests
+
+These fail outright if we don't have a way to get image sizes (e.g.,
+ImageMagick).
+---
+ test/test_art.py | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/test/test_art.py b/test/test_art.py
+index 02d26f4..1b12b76 100644
+--- a/test/test_art.py
++++ b/test/test_art.py
+@@ -561,21 +561,25 @@ def test_respect_enforce_ratio_no(self):
+         self._assertImageIsValidArt(self.IMG_500x490, True)
+ 
+     def test_respect_enforce_ratio_px_above(self):
++        self._require_backend()
+         self.plugin.enforce_ratio = True
+         self.plugin.margin_px = 5
+         self._assertImageIsValidArt(self.IMG_500x490, False)
+ 
+     def test_respect_enforce_ratio_px_below(self):
++        self._require_backend()
+         self.plugin.enforce_ratio = True
+         self.plugin.margin_px = 15
+         self._assertImageIsValidArt(self.IMG_500x490, True)
+ 
+     def test_respect_enforce_ratio_percent_above(self):
++        self._require_backend()
+         self.plugin.enforce_ratio = True
+         self.plugin.margin_percent = (500 - 490) / 500 * 0.5
+         self._assertImageIsValidArt(self.IMG_500x490, False)
+ 
+     def test_respect_enforce_ratio_percent_below(self):
++        self._require_backend()
+         self.plugin.enforce_ratio = True
+         self.plugin.margin_percent = (500 - 490) / 500 * 1.5
+         self._assertImageIsValidArt(self.IMG_500x490, True)