[bug#40400] [PATCH] gnu: Add wireguard-linux-compat.

[Leo Famulari <leo@famulari.name>]

Since WireGuard was added to Linux 5.6, the WireGuard upstream split
their old 'wireguard' codebase into 'wireguard-tools' (the userspace
tools) and 'wireguard-linux-compat' (the kernel patch for older
kernels).

This commit adds the new upstream for the kernel patch and deprecates
the obselete 'wireguard' package.

* gnu/packages/vpn.scm (wireguard-linux-compat): New variable.
(wireguard): Deprecate in favor of wireguard-tools.
---
 gnu/packages/vpn.scm | 61 ++++++++++++++++++--------------------------
 1 file changed, 25 insertions(+), 36 deletions(-)

diff --git a/gnu/packages/vpn.scm b/gnu/packages/vpn.scm
index becc505b34..e9d9ab8be4 100644
--- a/gnu/packages/vpn.scm
+++ b/gnu/packages/vpn.scm
@@ -453,61 +453,47 @@ The peer-to-peer VPN implements a Layer 2 (Ethernet) network between the peers
     ;; 3-clause BSD license.
     (license license:bsd-3)))
 
-(define-public wireguard
+(define-public wireguard-linux-compat
   (package
-    (name "wireguard")
-    (version "0.0.20191219")
+    (name "wireguard-linux-compat")
+    (version "1.0.20200401")
     (source (origin
               (method url-fetch)
-              (uri (string-append "https://git.zx2c4.com/WireGuard/snapshot/"
-                                  "WireGuard-" version ".tar.xz"))
+              (uri (string-append "https://git.zx2c4.com/wireguard-linux-compat/"
+                                  "snapshot/wireguard-linux-compat-" version
+                                  ".tar.xz"))
               (sha256
                (base32
-                "1rxhhf18vnlbxpaxib6y55gbvr5h9dcvl8sn2l5slzz97066zfjs"))))
+                "0ymprz3h4b92wlcqm5k5vmcgap8pjv202bgkdx0axmp12n1lmyvx"))))
     (build-system gnu-build-system)
-    (outputs '("out" ; The WireGuard userspace tools
-               "kernel-patch")) ; A patch to build Linux with WireGuard support
     (arguments
-     `(#:tests? #f ; No tests available.
-       #:make-flags
-       (list "CC=gcc"
-             "--directory=src/tools"
-             "WITH_BASHCOMPLETION=yes"
-             ;; Build and install the helper script wg-quick(8).
-             "WITH_WGQUICK=yes"
-             (string-append "PREFIX=" (assoc-ref %outputs "out"))
-             (string-append "SYSCONFDIR=" (assoc-ref %outputs "out") "/etc"))
+     `(#:tests? #f ; No test suite
        #:modules ((guix build gnu-build-system)
                   (guix build utils)
                   (ice-9 popen)
                   (ice-9 textual-ports))
        #:phases
        (modify-phases %standard-phases
-         ;; There is no ./configure script.
-         (delete 'configure)
-         ;; Until WireGuard is added to the upstream Linux kernel, it is
-         ;; distributed as a kernel patch generated by this script.
-         (add-after 'patch-source-shebangs 'make-patch
+         (delete 'configure) ; No ./configure script
+         (replace 'build
            (lambda* (#:key outputs #:allow-other-keys)
-             (let* ((output (string-append (assoc-ref outputs "kernel-patch")
-                                           "/wireguard.patch"))
-                    (patch-builder "./contrib/kernel-tree/create-patch.sh")
+             (let* ((patch-builder "./kernel-tree-scripts/create-patch.sh")
                     (port (open-input-pipe patch-builder))
                     (str (get-string-all port)))
                (close-pipe port)
-               (mkdir-p (dirname output))
-               (call-with-output-file output
+               (call-with-output-file "wireguard.patch"
                  (lambda (port)
                    (format port "~a" str))))
-               #t)))))
-    (inputs
-     `(("libmnl" ,libmnl)))
-    (home-page "https://www.wireguard.com/")
-    (synopsis "Tools for configuring WireGuard")
-    (description "This package provides the userspace tools for setting and
-retrieving configuration of WireGuard network tunnel interfaces, and a patch
-that can be applied to a Linux kernel source tree in order to build it with
-WireGuard support.")
+               #t))
+         (replace 'install
+           (lambda* (#:key outputs #:allow-other-keys)
+             (install-file "wireguard.patch"
+                           (assoc-ref %outputs "out"))
+             #t)))))
+    (home-page "https://git.zx2c4.com/wireguard-linux-compat/")
+    (synopsis "WireGuard kernel module for Linux 3.10 through 5.5")
+    (description "This is an out-of-tree Linux kernel patch for kernel versions
+3.10 through 5.5.  WireGuard was added to Linux 5.6.")
     (license license:gpl2)))
 
 (define-public wireguard-tools
@@ -556,6 +542,9 @@ public keys and can roam across IP addresses.")
      (list license:lgpl2.1+    ; src/netlink.h & contrib/embeddable-wg-library
            license:gpl2))))    ; everything else
 
+(define-public wireguard
+  (deprecated-package "wireguard" wireguard-tools))
+
 (define-public xl2tpd
   (package
     (name "xl2tpd")
-- 
2.26.0