gnu: Add fuse-3.

* gnu/packages/linux.scm (fuse-3): New variable.

gnu/packages/linux.scm

@@ -3377,6 +3377,66 @@ user-space processes.")
     (license (list license:lgpl2.1                ;library
                    license:gpl2+))))              ;command-line utilities
 
+(define-public fuse-3
+  (package
+    (inherit fuse)
+    (name "fuse")
+    (version "3.10.5")
+    (source (origin
+              (method url-fetch)
+              (uri
+               (string-append "https://github.com/libfuse/libfuse/releases/"
+                              "download/fuse-" version
+                              "/fuse-" version ".tar.xz"))
+              (sha256
+               (base32
+                "0rlnnsiw614qcmgy8xz67044gqc1pbvvf2yxjv44lh27bm487qmj"))))
+    (build-system meson-build-system)
+    (arguments
+     `(#:configure-flags
+       ,#~(list
+           (string-append "-Dudevrulesdir=" #$output "/udev/rules.d")
+           "-Duseroot=false")
+       #:tests? #f
+       #:phases
+       ,#~(modify-phases %standard-phases
+            (add-after 'unpack 'set-file-names
+              (lambda* (#:key inputs #:allow-other-keys)
+                ;; libfuse calls out to mount(8) and umount(8).  Make sure
+                ;; it refers to the right ones.
+                (substitute* '("lib/mount_util.c")
+                  (("/bin/(u?)mount" _ maybe-u)
+                   (search-input-file inputs
+                                      (string-append "bin/"
+                                                     maybe-u "mount"))))
+                (substitute* '("util/mount.fuse.c")
+                  (("/bin/sh")
+                   (search-input-file inputs "/bin/sh")))
+
+                ;; This hack leads libfuse to search for 'fusermount' in
+                ;; $PATH, where it may find a setuid-root binary, instead of
+                ;; trying solely $out/sbin/fusermount and failing because
+                ;; it's not setuid.
+                (substitute* "lib/meson.build"
+                  (("-DFUSERMOUNT_DIR=[[:graph:]]+")
+                   "-DFUSERMOUNT_DIR=\"/var/empty\"'"))))
+            (add-after 'unpack 'fix-install
+              (lambda* (#:key inputs #:allow-other-keys)
+                (substitute* '("util/meson.build")
+                  (("install_helper.sh") "true"))
+               (substitute* '("util/meson.build")
+                  (("fuseconf_path = .*")
+                   "fuseconf_path = '/etc/fuse.conf'"))))
+            (add-before 'configure 'set-paths
+              (lambda* (#:key inputs outputs #:allow-other-keys)
+                (let ((dummy-init.d
+                       (string-append (getcwd) "/etc/init.d")))
+                  (setenv "MOUNT_FUSE_PATH"
+                          (string-append #$output "/sbin"))
+                  (setenv "UDEV_RULES_PATH"
+                          (string-append #$output
+                                         "/lib/udev/rules.d"))))))))))
+
 (define-public unionfs-fuse
   (package
     (name "unionfs-fuse")