gnu: sqlite: Add locking-mode fix for the Hurd.

* gnu/packages/patches/sqlite-hurd.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/sqlite.scm (sqlite)[native-inputs]: Add it when building
for the Hurd.
[arguments]: Apply it when building for the Hurd.

gnu/local.mk

@@ -1374,6 +1374,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/sdl-pango-header-guard.patch		\
   %D%/packages/patches/sdl-pango-matrix_declarations.patch	\
   %D%/packages/patches/sdl-pango-sans-serif.patch		\
+  %D%/packages/patches/sqlite-hurd.patch			\
   %D%/packages/patches/patchutils-test-perms.patch		\
   %D%/packages/patches/patch-hurd-path-max.patch		\
   %D%/packages/patches/perl-autosplit-default-time.patch	\

gnu/packages/patches/sqlite-hurd.patch

@@ -0,0 +1,58 @@
+Adapted from Debian: https://sources.debian.org/patches/sqlite3/3.32.3-1/20-hurd-locking-style.patch
+Upstream status: Not upstreamed.
+
+This patch is needed to get offloading to work.
+
+Sqlite can use simple file locking mode, but that does not work for the Hurd;
+a second sqlite process fails with a "locking protocol" error.
+
+See also: https://bugs.debian.org/529734.
+
+diff -purN sqlite-autoconf-3310100/sqlite3.c sqlite-autoconf-3310100-/sqlite3.c
+--- sqlite-autoconf-3310100/sqlite3.c	2020-01-27 21:25:19.000000000 +0100
++++ sqlite-autoconf-3310100-/sqlite3.c	2020-07-01 11:50:13.768333806 +0200
+@@ -33189,7 +33189,7 @@ SQLITE_PRIVATE const char *sqlite3Opcode
+ # include <sys/mman.h>
+ #endif
+ 
+-#if SQLITE_ENABLE_LOCKING_STYLE
++#if SQLITE_ENABLE_LOCKING_STYLE || defined(__GNU__)
+ /* # include <sys/ioctl.h> */
+ # include <sys/file.h>
+ # include <sys/param.h>
+@@ -35676,7 +35676,7 @@ static int dotlockClose(sqlite3_file *id
+ **
+ ** Omit this section if SQLITE_ENABLE_LOCKING_STYLE is turned off
+ */
+-#if SQLITE_ENABLE_LOCKING_STYLE
++#if SQLITE_ENABLE_LOCKING_STYLE || defined(__GNU__)
+ 
+ /*
+ ** Retry flock() calls that fail with EINTR
+@@ -38586,7 +38586,7 @@ IOMETHODS(
+   0                         /* xShmMap method */
+ )
+ 
+-#if SQLITE_ENABLE_LOCKING_STYLE
++#if SQLITE_ENABLE_LOCKING_STYLE || defined(__GNU__)
+ IOMETHODS(
+   flockIoFinder,            /* Finder function name */
+   flockIoMethods,           /* sqlite3_io_methods object name */
+@@ -41142,6 +41142,8 @@ SQLITE_API int sqlite3_os_init(void){
+     UNIXVFS("unix",          autolockIoFinder ),
+ #elif OS_VXWORKS
+     UNIXVFS("unix",          vxworksIoFinder ),
++#elif defined(__GNU__)
++    UNIXVFS("unix",          flockIoFinder ),
+ #else
+     UNIXVFS("unix",          posixIoFinder ),
+ #endif
+@@ -41151,7 +41153,7 @@ SQLITE_API int sqlite3_os_init(void){
+ #if OS_VXWORKS
+     UNIXVFS("unix-namedsem", semIoFinder ),
+ #endif
+-#if SQLITE_ENABLE_LOCKING_STYLE || OS_VXWORKS
++#if SQLITE_ENABLE_LOCKING_STYLE || OS_VXWORKS || defined(__GNU__)
+     UNIXVFS("unix-posix",    posixIoFinder ),
+ #endif
+ #if SQLITE_ENABLE_LOCKING_STYLE

gnu/packages/sqlite.scm

@@ -11,6 +11,7 @@
 ;;; Copyright © 2017 Jelle Licht <jlicht@fsfe.org>
 ;;; Copyright © 2018 Tobias Geerinckx-Rice <me@tobias.gr>
 ;;; Copyright © 2018 Alex Vong <alexvong1995@gmail.com>
+;;; Copyright © 2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -29,6 +30,7 @@
 
 (define-module (gnu packages sqlite)
   #:use-module (gnu packages)
+  #:use-module (gnu packages hurd)
   #:use-module (gnu packages readline)
   #:use-module ((guix licenses) #:prefix license:)
   #:use-module (guix packages)
@@ -65,6 +67,11 @@ (define-public sqlite
               "1bj936svd8i5g25xd1bj52hj4zca01fgl3sqkj86z9q5pkz4wa32"))))
    (build-system gnu-build-system)
    (inputs `(("readline" ,readline)))
+   (native-inputs (if (hurd-target?)
+                      ;; TODO move into origin on the next rebuild cycle.
+                      `(("hurd-locking-mode.patch"
+                         ,@(search-patches "sqlite-hurd.patch")))
+                      '()))
    (outputs '("out" "static"))
    (arguments
     `(#:configure-flags
@@ -79,6 +86,18 @@ (define-public sqlite
                            ;; Column metadata is required by GNU Jami and Qt, et.al.
                            "-DSQLITE_ENABLE_COLUMN_METADATA"))
       #:phases (modify-phases %standard-phases
+                 ;; TODO: remove in the next rebuild cycle
+                 ,@(if (hurd-target?)
+                       `((add-after 'unpack 'patch-sqlite/hurd
+                           (lambda* (#:key inputs native-inputs
+                                     #:allow-other-keys)
+                             (let ((patch (assoc-ref
+                                           (if ,(%current-target-system)
+                                               native-inputs
+                                               inputs)
+                                           "hurd-locking-mode.patch")))
+                               (invoke "patch" "-p1" "--force" "-i" patch)))))
+                       '())
                  (add-after 'install 'move-static-library
                    (lambda* (#:key outputs #:allow-other-keys)
                      (let* ((out    (assoc-ref outputs "out"))