gnu: eudev: Update to 3.2.14.

Eudev now has a hardware database /etc/udev/hwdb.bin made up of descriptions
installed in the /lib/udev/hwdb.d directory of each package, and more
generally, UDEV_HWDB_PATH.  This database index is compiled with udevadm hwdb
--update.  The udev-service-type collects the files and compiles the index.
Previously, the hardware description files provided by eudev would be compiled
into $prefix/etc/udev/hwdb.bin in the eudev output.

* gnu/packages/linux.scm (eudev): Update to 3.2.14.
[modules]: Import (guix build utils).
[#:phases] <allow-eudev-hwdb>: New phase.
<install-in-lib>: New phase.
<build-hwdb>: Remove phase.
[#:configure-flags]: Set sysconfdir to avoid a prefix.
[native-search-paths]: Add UDEV_HWDB_PATH.
* gnu/packages/patches/eudev-rules-directory.patch: Rebase it.

gnu/packages/linux.scm

@@ -4327,10 +4327,9 @@ to the in-kernel OOM killer.")
     (license license:expat)))
 
 (define-public eudev
-  ;; The post-systemd fork, maintained by Gentoo.
   (package
     (name "eudev")
-    (version "3.2.11")
+    (version "3.2.14")
     (source (origin
               (method git-fetch)
               (uri (git-reference (url "https://github.com/gentoo/eudev")
@@ -4338,8 +4337,9 @@ to the in-kernel OOM killer.")
               (file-name (git-file-name name version))
               (sha256
                (base32
-                "0dzaqwjnl55f69ird57wb6skahc6l7zs1slsrzqqfhww33icp6av"))
+                "1f6lz57igi7iw2ls3fpzgw42bfznam4nf9368h7x8yf1mb737yxz"))
-              (patches (search-patches "eudev-rules-directory.patch"))))
+              (patches (search-patches "eudev-rules-directory.patch"))
+              (modules '((guix build utils)))))
     (build-system gnu-build-system)
     (arguments
      (list
@@ -4350,6 +4350,31 @@ to the in-kernel OOM killer.")
               (substitute* "man/make.sh"
                 (("/usr/bin/xsltproc")
                  (search-input-file (or native-inputs inputs) "/bin/xsltproc")))))
+          (add-before 'bootstrap 'install-in-lib
+            (lambda _
+              ;; When the udev-service-type instantiates /etc, it collects
+              ;; hardware files from the <package>/lib/udev/hwdb.d directories
+              ;; of different packages.  Since we set sysconfdir to /etc, the
+              ;; only package-dependent location we can install hwdb files is
+              ;; in <package>/lib/udev/hwdb.d.  Eudev is configured to install
+              ;; these files in sysconfdir, but they should be placed into
+              ;; udevlibexecdir.
+              (copy-file "hwdb/Makefile.am" "hwdb/files.am")
+              (call-with-output-file "hwdb/Makefile.am"
+                (lambda (port)
+                  (format port "hardwarelibdir = $(udevlibexecdir)/hwdb.d\n")
+                  (format port "include ./files.am")))
+              (substitute* "hwdb/files.am"
+                (("dist_udevhwdb_DATA =")
+                 "dist_hardwarelib_DATA ="))
+              ;; Do not install the empty udev.conf template.
+              (substitute* "src/udev/Makefile.am"
+                (("dist_udevconf_DATA =")
+                 "dist_noinst_DATA ="))
+              ;; Do not ensure that /etc/udev/rules.d exists.
+              (substitute* "rules/Makefile.am"
+                (("\\$\\(MKDIR_P\\) \\$\\(DESTDIR\\)\\$\\(udevconfdir\\)/rules\\.d")
+                 "true"))))
           (add-after 'install 'move-static-library
             (lambda _
               (let ((source (string-append #$output "/lib/libudev.a"))
@@ -4361,19 +4386,17 @@ to the in-kernel OOM killer.")
                 ;; such that Libtool looks for it in the usual places.
                 (substitute* (string-append #$output "/lib/libudev.la")
                   (("old_library=.*")
-                   "old_library=''\n")))))
+                   "old_library=''\n"))))))
-          (add-after 'install 'build-hwdb
+      #:configure-flags
-            (lambda _
+      #~(list "--enable-manpages"
-              ;; Build OUT/etc/udev/hwdb.bin.  This allows 'lsusb' and
+              ;; By default, autoconf uses $prefix/etc. The udev-service-type
-              ;; similar tools to display product names.
+              ;; makes sure /etc is set up with rules and hardware file
-              ;;
+              ;; descriptions.
-              ;; XXX: This can't be done when cross-compiling. Find another way
+              "--sysconfdir=/etc")))
-              ;; to generate hwdb.bin for cross-built systems.
+    (native-search-paths
-              #$@(if (%current-target-system)
+      (list (search-path-specification
-                     #~(#t)
+              (variable "UDEV_HWDB_PATH")
-                     #~((invoke (string-append #$output "/bin/udevadm")
+              (files '("lib/udev/hwdb.d")))))
-                                "hwdb" "--update"))))))
-       #:configure-flags #~(list "--enable-manpages")))
     (native-inputs
      (list autoconf
            automake

gnu/packages/patches/eudev-rules-directory.patch

@@ -4,9 +4,9 @@ The old udev 182 supported $UDEV_CONFIG_FILE, which in turn allowed
 the search path to be customized, but eudev no longer has this, hence
 this hack.
 
---- eudev-3.1.5/src/udev/udev-rules.c	2015-10-13 06:22:14.000000000 +0800
+--- a/src/udev/udev-rules.c
-+++ eudev-3.1.5/src/udev/udev-rules.c	2015-10-16 20:45:38.491934336 +0800
++++ b/src/udev/udev-rules.c
-@@ -47,15 +47,11 @@
+@@ -48,16 +48,11 @@ struct uid_gid {
          };
  };
  
@@ -20,11 +20,12 @@ this hack.
 -        "/lib/udev/rules.d",
 -        "/usr/lib/udev/rules.d",
 -#endif
+-        "/usr/local/lib/udev/rules.d",
 +        NULL,			/* placeholder for $EUDEV_RULES_DIRECTORY */
          NULL};
  
  struct udev_rules {
-@@ -1704,6 +1700,9 @@
+@@ -1718,6 +1713,9 @@ struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names) {
  
          udev_rules_check_timestamp(rules);