Add upstream fix for OCaml tests.

0001-ocaml-tests-Fix-race-when-creating-and-deleting-file.patch

@@ -0,0 +1,70 @@
+From 7a98b786b179c626699969d41f2d4ff4550937a7 Mon Sep 17 00:00:00 2001
+From: "Richard W.M. Jones" <rjones@redhat.com>
+Date: Mon, 5 Aug 2019 16:16:58 +0100
+Subject: [PATCH] ocaml/tests: Fix race when creating and deleting files in
+ tests.
+
+Two of the OCaml tests used a test file in the local directory with a
+fixed name.  However because each test runs twice (once for bytecode
+and once for native code), on a machine with many cores the file might
+be deleted by one instance of the test while it is still in use by the
+other instance, causing a test failure.  (This was observed on a
+machine with 48 cores.)
+---
+ ocaml/tests/test_410_pwrite.ml     | 9 +++++----
+ ocaml/tests/test_510_aio_pwrite.ml | 9 +++++----
+ 2 files changed, 10 insertions(+), 8 deletions(-)
+
+diff --git a/ocaml/tests/test_410_pwrite.ml b/ocaml/tests/test_410_pwrite.ml
+index 3b63da7..0b14e1b 100644
+--- a/ocaml/tests/test_410_pwrite.ml
++++ b/ocaml/tests/test_410_pwrite.ml
+@@ -24,10 +24,11 @@ let () =
+   Bytes.set buf1 510 '\x55';
+   Bytes.set buf1 511 '\xAA';
+ 
+-  let datafile = "410-pwrite.data" in
+-  let fd = openfile datafile [O_WRONLY;O_CREAT;O_TRUNC] 0o644 in
++  let datafile, chan =
++    Filename.open_temp_file ~mode:[Open_binary] "410" ".data" in
++  let fd = descr_of_out_channel chan in
+   ftruncate fd 512;
+-  close fd;
++  close_out chan;
+ 
+   let nbd = NBD.create () in
+   NBD.connect_command nbd ["nbdkit"; "-s"; "--exit-with-parent"; "-v";
+@@ -44,4 +45,4 @@ let () =
+   close fd;
+   assert (buf1 = content);
+ 
+-  Unix.unlink datafile
++  unlink datafile
+diff --git a/ocaml/tests/test_510_aio_pwrite.ml b/ocaml/tests/test_510_aio_pwrite.ml
+index 4e3f630..0930dcd 100644
+--- a/ocaml/tests/test_510_aio_pwrite.ml
++++ b/ocaml/tests/test_510_aio_pwrite.ml
+@@ -24,10 +24,11 @@ let () =
+   Bytes.set buf 510 '\x55';
+   Bytes.set buf 511 '\xAA';
+ 
+-  let datafile = "510-pwrite.data" in
+-  let fd = openfile datafile [O_WRONLY;O_CREAT;O_TRUNC] 0o644 in
++  let datafile, chan =
++    Filename.open_temp_file ~mode:[Open_binary] "510" ".data" in
++  let fd = descr_of_out_channel chan in
+   ftruncate fd 512;
+-  close fd;
++  close_out chan;
+ 
+   let nbd = NBD.create () in
+   NBD.connect_command nbd ["nbdkit"; "-s"; "--exit-with-parent"; "-v";
+@@ -53,4 +54,4 @@ let () =
+   close fd;
+   assert (buf = content);
+ 
+-  Unix.unlink datafile
++  unlink datafile
+-- 
+2.22.0
+

libnbd.spec

@@ -23,7 +23,7 @@ Source1:        http://libguestfs.org/download/libnbd/%{source_directory}/%{name
 Source2:       libguestfs.keyring
 
 # Patches.
-#(none)
+Patch1:        0001-ocaml-tests-Fix-race-when-creating-and-deleting-file.patch
 
 %if 0%{patches_touch_autotools}
 BuildRequires: autoconf, automake, libtool