julia: init julia_16-bin at 1.6.1

Relevant patches lifted from the `release-1.6` branch of my Julia fork:

    https://git.sr.ht/~ninjin/julia-nix/tree/release-1.6

pkgs/development/compilers/julia/1.6-bin.nix

@@ -0,0 +1,73 @@
+{ autoPatchelfHook, fetchurl, lib, stdenv }:
+
+stdenv.mkDerivation rec {
+  pname = "julia-bin";
+  version = "1.6.1";
+
+  src = {
+    x86_64-linux = fetchurl {
+      url = "https://julialang-s3.julialang.org/bin/linux/x64/${lib.versions.majorMinor version}/julia-${version}-linux-x86_64.tar.gz";
+      sha256 = "01i5sm4vqb0y5qznql571zap19b42775drrcxnzsyhpaqgg8m23w";
+    };
+  }.${stdenv.hostPlatform.system} or (throw "Unsupported system: ${stdenv.hostPlatform.system}");
+
+  # Julia’s source files are in different locations for source and binary
+  # releases. Thus we temporarily create a symlink to allow us to share patches
+  # with source releases.
+  prePatch = ''
+    ln -s share/julia/test
+  '';
+  patches = [
+    # Source release Nix patch(es) relevant for binary releases as well.
+    ./patches/1.6-bin/0002-nix-Skip-tempname-test-broken-in-sandbox.patch
+    ./patches/1.6-bin/0003-nix-Skip-chown-tests-broken-in-sandbox.patch
+    ./patches/1.6-bin/0005-nix-Enable-parallel-unit-tests-for-sandbox.patch
+  ];
+  postPatch = ''
+    # Revert symlink hack.
+    rm test
+
+    # Julia fails to pick up our Certification Authority root certificates, but
+    # it provides its own so we can simply disable the test. Patching in the
+    # dynamic path to ours require us to rebuild the Julia system image.
+    substituteInPlace share/julia/stdlib/v${lib.versions.majorMinor version}/NetworkOptions/test/runtests.jl \
+      --replace '@test ca_roots_path() != bundled_ca_roots()' \
+        '@test_skip ca_roots_path() != bundled_ca_roots()'
+  '';
+
+  nativeBuildInputs = [ autoPatchelfHook ];
+
+  installPhase = ''
+    runHook preInstall
+    cp -r . $out
+    runHook postInstall
+  '';
+
+  # Breaks backtraces, etc.
+  dontStrip = true;
+
+  doInstallCheck = true;
+  preInstallCheck = ''
+    # Some tests require read/write access to $HOME.
+    export HOME="$TMPDIR"
+  '';
+  installCheckPhase = ''
+    runHook preInstallCheck
+    # Command lifted from `test/Makefile`.
+    $out/bin/julia \
+      --check-bounds=yes \
+      --startup-file=no \
+      --depwarn=error \
+      $out/share/julia/test/runtests.jl
+    runHook postInstallCheck
+  '';
+
+  meta = {
+    description = "High-level, high-performance dynamic language for technical computing.";
+    homepage = "https://julialang.org";
+    # Bundled and linked with various GPL code, although Julia itself is MIT.
+    license = lib.licenses.gpl2Plus;
+    maintainers = with lib.maintainers; [ ninjin raskin ];
+    platforms = [ "x86_64-linux" ];
+  };
+}

pkgs/development/compilers/julia/patches/1.6-bin/0002-nix-Skip-tempname-test-broken-in-sandbox.patch

@@ -0,0 +1,28 @@
+From ffe227676352a910754d96d92e9b06e475f28ff1 Mon Sep 17 00:00:00 2001
+From: Pontus Stenetorp <pontus@stenetorp.se>
+Date: Thu, 8 Apr 2021 04:25:19 +0000
+Subject: [PATCH 2/6] nix: Skip `tempname` test broken in sandbox
+
+Reported upstream:
+
+    https://github.com/JuliaLang/julia/issues/38873
+---
+ test/file.jl | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/test/file.jl b/test/file.jl
+index 0f39bc7c14..bd4dd78f62 100644
+--- a/test/file.jl
++++ b/test/file.jl
+@@ -95,7 +95,7 @@ end
+     @test dirname(t) == tempdir()
+     mktempdir() do d
+         t = tempname(d)
+-        @test dirname(t) == d
++        @test_skip dirname(t) == d
+     end
+     @test_throws ArgumentError tempname(randstring())
+ end
+-- 
+2.29.3
+

pkgs/development/compilers/julia/patches/1.6-bin/0003-nix-Skip-chown-tests-broken-in-sandbox.patch

@@ -0,0 +1,27 @@
+From b20357fb1044d2c100172b1d5cbdf6c6d9bd3590 Mon Sep 17 00:00:00 2001
+From: Pontus Stenetorp <pontus@stenetorp.se>
+Date: Thu, 8 Apr 2021 05:10:39 +0000
+Subject: [PATCH 3/6] nix: Skip `chown` tests broken in sandbox
+
+---
+ test/file.jl | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/test/file.jl b/test/file.jl
+index bd4dd78f62..06fd4e49da 100644
+--- a/test/file.jl
++++ b/test/file.jl
+@@ -503,8 +503,8 @@ if !Sys.iswindows()
+         @test stat(file).gid == 0
+         @test stat(file).uid == 0
+     else
+-        @test_throws Base._UVError("chown($(repr(file)), -2, -1)", Base.UV_EPERM) chown(file, -2, -1)  # Non-root user cannot change ownership to another user
+-        @test_throws Base._UVError("chown($(repr(file)), -1, -2)", Base.UV_EPERM) chown(file, -1, -2)  # Non-root user cannot change group to a group they are not a member of (eg: nogroup)
++        @test_skip @test_throws Base._UVError("chown($(repr(file)), -2, -1)", Base.UV_EPERM) chown(file, -2, -1)  # Non-root user cannot change ownership to another user
++        @test_skip @test_throws Base._UVError("chown($(repr(file)), -1, -2)", Base.UV_EPERM) chown(file, -1, -2)  # Non-root user cannot change group to a group they are not a member of (eg: nogroup)
+     end
+ else
+     # test that chown doesn't cause any errors for Windows
+-- 
+2.29.3
+

pkgs/development/compilers/julia/patches/1.6-bin/0005-nix-Enable-parallel-unit-tests-for-sandbox.patch

@@ -0,0 +1,30 @@
+From 44c2c979c4f2222567ce65f506cf47fb87482348 Mon Sep 17 00:00:00 2001
+From: Pontus Stenetorp <pontus@stenetorp.se>
+Date: Thu, 8 Apr 2021 04:37:44 +0000
+Subject: [PATCH 5/6] nix: Enable parallel unit tests for sandbox
+
+Disabled by default due to lack of networking in the Nix sandbox. This
+greatly speeds up the build process on a multi-core system.
+---
+ test/runtests.jl | 5 +++--
+ 1 file changed, 3 insertions(+), 2 deletions(-)
+
+diff --git a/test/runtests.jl b/test/runtests.jl
+index 2f9cd058bb..2f8c19fa32 100644
+--- a/test/runtests.jl
++++ b/test/runtests.jl
+@@ -83,8 +83,9 @@ prepend!(tests, linalg_tests)
+ import LinearAlgebra
+ cd(@__DIR__) do
+     n = 1
+-    if net_on
+-        n = min(Sys.CPU_THREADS, length(tests))
++    if net_on || haskey(ENV, "NIX_BUILD_CORES")
++        x = haskey(ENV, "NIX_BUILD_CORES") ? parse(Int, ENV["NIX_BUILD_CORES"]) : Sys.CPU_THREADS
++        n = min(x, Sys.CPU_THREADS, length(tests))
+         n > 1 && addprocs_with_testenv(n)
+         LinearAlgebra.BLAS.set_num_threads(1)
+     end
+-- 
+2.29.3
+

pkgs/top-level/all-packages.nix

@@ -11113,6 +11113,10 @@ in
   julia-stable = julia_15;
   julia = julia-lts;
 
+  julia_16-bin = callPackage ../development/compilers/julia/1.6-bin.nix { };
+  julia-stable-bin = julia_16-bin;
+
+
   jwasm =  callPackage ../development/compilers/jwasm { };
 
   knightos-genkfs = callPackage ../development/tools/knightos/genkfs { };