xar: 1.6.1 -> 498

This change switches the xar package from unmaintained fork of the
original project to the Apple Open Source tarball. See also
https://repology.org/project/xar/versions

Since the package is essentially rewritten from scratch, we take an
opportunity and move it to pkgs/by-name/xa/xar (formatted with nixfmt).

We also remove Windows from the supported platforms because even before
this change pkgsCross.mingwW64.xar failed with
xar> configure: error: can not detect the size of your system's uid_t type

pkgs/by-name/xa/xar/package.nix

@@ -0,0 +1,178 @@
+{
+  lib,
+  stdenv,
+  fetchFromGitHub,
+  applyPatches,
+  autoreconfHook,
+  nix-update-script,
+
+  # Required dependencies.
+  openssl,
+  zlib,
+  libxml2,
+
+  # Optional dependencies.
+  e2fsprogs,
+  bzip2,
+  xz, # lzma
+
+  # Platform-specific dependencies.
+  acl,
+  musl-fts,
+
+  # for tests
+  testers,
+  python3,
+  libxslt, # xsltproc
+  runCommand,
+  runCommandCC,
+  makeWrapper,
+  xar,
+}:
+stdenv.mkDerivation (finalAttrs: {
+  pname = "xar";
+  version = "498";
+
+  src = fetchFromGitHub {
+    owner = "apple-oss-distributions";
+    repo = "xar";
+    rev = "xar-${finalAttrs.version}";
+    hash = "sha256-RyWeR/ZnDBHIZhwzVxETdrTTPQA2VgsLZegRkxX1240=";
+  };
+
+  # Update patch set with
+  #   git clone https://github.com/apple-oss-distributions/xar
+  #   cd xar
+  #   git switch -c nixpkgs
+  #   git am ../pkgs/by-name/xa/xar/patches/*
+  #   # …
+  #   rm -r ../pkgs/by-name/xa/xar/patches
+  #   git format-patch --zero-commit --output-directory ../pkgs/by-name/xa/xar/patches main
+  patches = lib.filesystem.listFilesRecursive ./patches;
+
+  # We do not use or modify files outside of the xar subdirectory.
+  patchFlags = [ "-p2" ];
+  sourceRoot = "source/xar";
+
+  outputs = [
+    "out"
+    "lib"
+    "dev"
+  ];
+
+  strictDeps = true;
+
+  nativeBuildInputs = [ autoreconfHook ];
+
+  # For some reason libxml2 package headers are in subdirectory and thus aren’t
+  # picked up by stdenv’s C compiler wrapper (see ccWrapper_addCVars). This
+  # doesn’t really belong here and either should be part of libxml2 package or
+  # libxml2 in Nixpkgs can just fix their header paths.
+  env.NIX_CFLAGS_COMPILE = "-isystem ${libxml2.dev}/include/libxml2";
+
+  buildInputs =
+    [
+      # NB we use OpenSSL instead of CommonCrypto on Darwin.
+      openssl
+      zlib
+      libxml2
+      bzip2
+      xz
+      e2fsprogs
+    ]
+    ++ lib.optional stdenv.hostPlatform.isLinux acl ++ lib.optional stdenv.hostPlatform.isMusl musl-fts;
+
+  passthru =
+    let
+      patchedSource = applyPatches { inherit (finalAttrs) src patches; };
+      pythonForTests = python3.withPackages (p: [ p.xattr ]);
+    in
+    {
+      # Tests xar outside of the Nix sandbox (extended attributes are not supported
+      # in Nix sandbox, e.g. filtered with seccomp on Linux).
+      #
+      # Run with
+      # $ nix run --file . xar.impureTests.integrationTest
+      # Ensure that all tests are PASSED and none are FAILED or SKIPPED.
+      impureTests.integrationTest =
+        runCommand "xar-impure-tests-integration-test"
+          {
+            src = patchedSource;
+            xar = finalAttrs.finalPackage;
+            xsltproc = lib.getBin libxslt;
+            pythonInterpreter = pythonForTests.interpreter;
+            nativeBuildInputs = [ makeWrapper ];
+          }
+          ''
+            makeWrapper "$pythonInterpreter" "$out/bin/$name" \
+              --prefix PATH : "$xar/bin" \
+              --suffix PATH : "$xsltproc/bin" \
+              --add-flags -- \
+              --add-flags "$src/xar/test/run-all.py"
+          '';
+
+      tests = lib.optionalAttrs (stdenv.buildPlatform.canExecute stdenv.hostPlatform) {
+        version = testers.testVersion {
+          package = finalAttrs.finalPackage;
+          version = "1.8dev";
+        };
+
+        integrationTest =
+          runCommand "xar-tests-integration-test"
+            {
+              src = patchedSource;
+              strictDeps = true;
+              pythonExecutable = pythonForTests.executable;
+              nativeBuildInputs = [
+                finalAttrs.finalPackage
+                pythonForTests
+                libxslt
+              ];
+            }
+            ''
+              "$pythonExecutable" "$src"/xar/test/run-all.py
+              touch "$out"
+            '';
+
+        smokeTest =
+          runCommandCC "xar-tests-smoke-test"
+            {
+              src = patchedSource;
+              strictDeps = true;
+              nativeBuildInputs = [ finalAttrs.finalPackage ];
+              buildInputs = [
+                finalAttrs.finalPackage
+                openssl
+              ];
+            }
+            ''
+              cp "$src"/xar/test/{buffer.c,validate.c} .
+              "$CC" -lxar -o buffer buffer.c
+              "$CC" -lxar -lcrypto -o validate validate.c
+              ./buffer validate.c
+              xar -x -f test.xar
+              diff validate.c mydir/secondfile
+              ./validate test.xar
+              touch "$out"
+            '';
+      };
+
+      updateScript = nix-update-script {
+        extraArgs = [
+          "--version-regex"
+          "xar-(.*)"
+        ];
+      };
+    };
+
+  meta = {
+    homepage = "https://github.com/apple-oss-distributions/xar";
+    description = "An easily extensible archive format";
+    license = lib.licenses.bsd3;
+    maintainers =
+      lib.teams.darwin.members
+      ++ lib.attrValues { inherit (lib.maintainers) copumpkin tie; };
+    platforms = lib.platforms.unix;
+    mainProgram = "xar";
+  };
+})