Merge pull request #106984 from divanorama/bazel_4

bazel_4: init at 4.0.0

pkgs/development/tools/build-managers/bazel/bazel_4/default.nix

···
+{ stdenv, callPackage, lib, fetchurl, fetchFromGitHub, installShellFiles
+, runCommand, runCommandCC, makeWrapper, recurseIntoAttrs
+# this package (through the fixpoint glass)
+, bazel_self
+# needed only for the updater
+, bazel_3
+, lr, xe, zip, unzip, bash, writeCBin, coreutils
+, which, gawk, gnused, gnutar, gnugrep, gzip, findutils
+# updater
+, python27, python3, writeScript
+# Apple dependencies
+, cctools, libcxx, CoreFoundation, CoreServices, Foundation
+# Allow to independently override the jdks used to build and run respectively
+, buildJdk, runJdk
+, buildJdkName
+, runtimeShell
+# Downstream packages for tests
+, bazel-watcher
+# Always assume all markers valid (this is needed because we remove markers; they are non-deterministic).
+# Also, don't clean up environment variables (so that NIX_ environment variables are passed to compilers).
+, enableNixHacks ? false
+, gcc-unwrapped
+, autoPatchelfHook
+, file
+, substituteAll
+, writeTextFile
+}:
+
+let
+  version = "4.0.0";
+  sourceRoot = ".";
+
+  src = fetchurl {
+    url = "https://github.com/bazelbuild/bazel/releases/download/${version}/bazel-${version}-dist.zip";
+    sha256 = "1lfdx54dpzwrqysg5ngqhq7a0i01xk981crd4pdk4jb5f07ghl6k";
+  };
+
+  # Update with `eval $(nix-build -A bazel.updater)`,
+  # then add new dependencies from the dict in ./src-deps.json as required.
+  srcDeps = lib.attrsets.attrValues srcDepsSet;
+  srcDepsSet =
+    let
+      srcs = (builtins.fromJSON (builtins.readFile ./src-deps.json));
+      toFetchurl = d: lib.attrsets.nameValuePair d.name (fetchurl {
+        urls = d.urls;
+        sha256 = d.sha256;
+        });
+        in builtins.listToAttrs (map toFetchurl [
+      srcs.desugar_jdk_libs
+      srcs.io_bazel_skydoc
+      srcs.bazel_skylib
+      srcs.io_bazel_rules_sass
+      srcs.platforms
+      (if stdenv.hostPlatform.isDarwin
+       then srcs."java_tools_javac11_darwin-v10.5.zip"
+       else srcs."java_tools_javac11_linux-v10.5.zip")
+      srcs."coverage_output_generator-v2.5.zip"
+      srcs.build_bazel_rules_nodejs
+      srcs."android_tools_pkg-0.19.0rc3.tar.gz"
+      srcs.bazel_toolchains
+      srcs.com_github_grpc_grpc
+      srcs.upb
+      srcs.com_google_protobuf
+      srcs.rules_pkg
+      srcs.rules_cc
+      srcs.rules_java
+      srcs.rules_proto
+      srcs.com_google_absl
+      srcs.com_github_google_re2
+      srcs.com_github_cares_cares
+      ]);
+
+  distDir = runCommand "bazel-deps" {} ''
+    mkdir -p $out
+    for i in ${builtins.toString srcDeps}; do cp $i $out/$(stripHash $i); done
+  '';
+
+  defaultShellPath = lib.makeBinPath
+    # Keep this list conservative. For more exotic tools, prefer to use
+    # @rules_nixpkgs to pull in tools from the nix repository. Example:
+    #
+    # WORKSPACE:
+    #
+    #     nixpkgs_git_repository(
+    #         name = "nixpkgs",
+    #         revision = "def5124ec8367efdba95a99523dd06d918cb0ae8",
+    #     )
+    #
+    #     # This defines an external Bazel workspace.
+    #     nixpkgs_package(
+    #         name = "bison",
+    #         repositories = { "nixpkgs": "@nixpkgs//:default.nix" },
+    #     )
+    #
+    # some/BUILD.bazel:
+    #
+    #     genrule(
+    #        ...
+    #        cmd = "$(location @bison//:bin/bison) -other -args",
+    #        tools = [
+    #            ...
+    #            "@bison//:bin/bison",
+    #        ],
+    #     )
+    #
+    [ bash coreutils findutils gawk gnugrep gnutar gnused gzip which unzip file zip python27 python3 ];
+
+  # Java toolchain used for the build and tests
+  javaToolchain = "@bazel_tools//tools/jdk:toolchain_${buildJdkName}";
+
+  platforms = lib.platforms.linux ++ lib.platforms.darwin;
+
+  # This repository is fetched by bazel at runtime
+  # however it contains prebuilt java binaries, with wrong interpreter
+  # and libraries path.
+  # We prefetch it, patch it, and override it in a global bazelrc.
+  system = if stdenv.hostPlatform.isDarwin then "darwin" else "linux";
+  arch = stdenv.hostPlatform.parsed.cpu.name;
+
+  remote_java_tools = stdenv.mkDerivation {
+    name = "remote_java_tools_${system}";
+
+    src = srcDepsSet."java_tools_javac11_${system}-v10.5.zip";
+
+    nativeBuildInputs = [ autoPatchelfHook unzip ];
+    buildInputs = [ gcc-unwrapped ];
+
+    sourceRoot = ".";
+
+    buildPhase = ''
+      mkdir $out;
+    '';
+
+    installPhase = ''
+      cp -Ra * $out/
+      touch $out/WORKSPACE
+    '';
+  };
+
+  bazelRC = writeTextFile {
+    name = "bazel-rc";
+    text = ''
+      startup --server_javabase=${runJdk}
+
+      # Can't use 'common'; https://github.com/bazelbuild/bazel/issues/3054
+      # Most commands inherit from 'build' anyway.
+      build --distdir=${distDir}
+      fetch --distdir=${distDir}
+      query --distdir=${distDir}
+
+      build --override_repository=${remote_java_tools.name}=${remote_java_tools}
+      fetch --override_repository=${remote_java_tools.name}=${remote_java_tools}
+      query --override_repository=${remote_java_tools.name}=${remote_java_tools}
+
+      # Provide a default java toolchain, this will be the same as ${runJdk}
+      build --host_javabase='@local_jdk//:jdk'
+
+      # load default location for the system wide configuration
+      try-import /etc/bazel.bazelrc
+    '';
+  };
+
+in
+stdenv.mkDerivation rec {
+  pname = "bazel";
+  inherit version;
+
+  meta = with lib; {
+    homepage = "https://github.com/bazelbuild/bazel/";
+    description = "Build tool that builds code quickly and reliably";
+    license = licenses.asl20;
+    maintainers = [ maintainers.mboes ];
+    inherit platforms;
+  };
+
+  inherit src;
+  inherit sourceRoot;
+  patches = [
+    # On Darwin, the last argument to gcc is coming up as an empty string. i.e: ''
+    # This is breaking the build of any C target. This patch removes the last
+    # argument if it's found to be an empty string.
+    ../trim-last-argument-to-gcc-if-empty.patch
+
+    # On Darwin, using clang 6 to build fails because of a linker error (see #105573),
+    # but using clang 7 fails because libarclite_macosx.a cannot be found when linking
+    # the xcode_locator tool.
+    # This patch removes using the -fobjc-arc compiler option and makes the code
+    # compile without automatic reference counting. Caveat: this leaks memory, but
+    # we accept this fact because xcode_locator is only a short-lived process used during the build.
+    ./no-arc.patch
+
+    # --experimental_strict_action_env (which may one day become the default
+    # see bazelbuild/bazel#2574) hardcodes the default
+    # action environment to a non hermetic value (e.g. "/usr/local/bin").
+    # This is non hermetic on non-nixos systems. On NixOS, bazel cannot find the required binaries.
+    # So we are replacing this bazel paths by defaultShellPath,
+    # improving hermeticity and making it work in nixos.
+    (substituteAll {
+      src = ../strict_action_env.patch;
+      strictActionEnvPatch = defaultShellPath;
+    })
+
+    # bazel reads its system bazelrc in /etc
+    # override this path to a builtin one
+    (substituteAll {
+      src = ../bazel_rc.patch;
+      bazelSystemBazelRCPath = bazelRC;
+    })
+  ] ++ lib.optional enableNixHacks ../nix-hacks.patch;
+
+
+  # Additional tests that check bazel’s functionality. Execute
+  #
+  #     nix-build . -A bazel.tests
+  #
+  # in the nixpkgs checkout root to exercise them locally.
+  passthru.tests =
+    let
+      runLocal = name: attrs: script:
+      let
+        attrs' = removeAttrs attrs [ "buildInputs" ];
+        buildInputs = [ python3 ] ++ (attrs.buildInputs or []);
+      in
+      runCommandCC name ({
+        inherit buildInputs;
+        preferLocalBuild = true;
+        meta.platforms = platforms;
+      } // attrs') script;
+
+      # bazel wants to extract itself into $install_dir/install every time it runs,
+      # so let’s do that only once.
+      extracted = bazelPkg:
+        let install_dir =
+          # `install_base` field printed by `bazel info`, minus the hash.
+          # yes, this path is kinda magic. Sorry.
+          "$HOME/.cache/bazel/_bazel_nixbld";
+        in runLocal "bazel-extracted-homedir" { passthru.install_dir = install_dir; } ''
+            export HOME=$(mktemp -d)
+            touch WORKSPACE # yeah, everything sucks
+            install_base="$(${bazelPkg}/bin/bazel info | grep install_base)"
+            # assert it’s actually below install_dir
+            [[ "$install_base" =~ ${install_dir} ]] \
+              || (echo "oh no! $install_base but we are \
+            trying to copy ${install_dir} to $out instead!"; exit 1)
+            cp -R ${install_dir} $out
+          '';
+
+      bazelTest = { name, bazelScript, workspaceDir, bazelPkg, buildInputs ? [] }:
+        let
+          be = extracted bazelPkg;
+        in runLocal name { inherit buildInputs; } (
+          # skip extraction caching on Darwin, because nobody knows how Darwin works
+          (lib.optionalString (!stdenv.hostPlatform.isDarwin) ''
+            # set up home with pre-unpacked bazel
+            export HOME=$(mktemp -d)
+            mkdir -p ${be.install_dir}
+            cp -R ${be}/install ${be.install_dir}
+
+            # https://stackoverflow.com/questions/47775668/bazel-how-to-skip-corrupt-installation-on-centos6
+            # Bazel checks whether the mtime of the install dir files
+            # is >9 years in the future, otherwise it extracts itself again.
+            # see PosixFileMTime::IsUntampered in src/main/cpp/util
+            # What the hell bazel.
+            ${lr}/bin/lr -0 -U ${be.install_dir} | ${xe}/bin/xe -N0 -0 touch --date="9 years 6 months" {}
+          '')
+          +
+          ''
+            # Note https://github.com/bazelbuild/bazel/issues/5763#issuecomment-456374609
+            # about why to create a subdir for the workspace.
+            cp -r ${workspaceDir} wd && chmod u+w wd && cd wd
+
+            ${bazelScript}
+
+            touch $out
+          '');
+
+      bazelWithNixHacks = bazel_self.override { enableNixHacks = true; };
+
+      bazel-examples = fetchFromGitHub {
+        owner = "bazelbuild";
+        repo = "examples";
+        rev = "4183fc709c26a00366665e2d60d70521dc0b405d";
+        sha256 = "1mm4awx6sa0myiz9j4hwp71rpr7yh8vihf3zm15n2ii6xb82r31k";
+      };
+
+    in (if !stdenv.hostPlatform.isDarwin then {
+      # `extracted` doesn’t work on darwin
+      shebang = callPackage ../shebang-test.nix { inherit runLocal extracted bazelTest distDir; };
+    } else {}) // {
+      bashTools = callPackage ../bash-tools-test.nix { inherit runLocal bazelTest distDir; };
+      cpp = callPackage ../cpp-test.nix { inherit runLocal bazelTest bazel-examples distDir; };
+      java = callPackage ../java-test.nix { inherit runLocal bazelTest bazel-examples distDir; };
+      protobuf = callPackage ../protobuf-test.nix { inherit runLocal bazelTest distDir; };
+      pythonBinPath = callPackage ../python-bin-path-test.nix { inherit runLocal bazelTest distDir; };
+
+      bashToolsWithNixHacks = callPackage ../bash-tools-test.nix { inherit runLocal bazelTest distDir; bazel = bazelWithNixHacks; };
+
+      cppWithNixHacks = callPackage ../cpp-test.nix { inherit runLocal bazelTest bazel-examples distDir; bazel = bazelWithNixHacks; };
+      javaWithNixHacks = callPackage ../java-test.nix { inherit runLocal bazelTest bazel-examples distDir; bazel = bazelWithNixHacks; };
+      protobufWithNixHacks = callPackage ../protobuf-test.nix { inherit runLocal bazelTest distDir; bazel = bazelWithNixHacks; };
+      pythonBinPathWithNixHacks = callPackage ../python-bin-path-test.nix { inherit runLocal bazelTest distDir; bazel = bazelWithNixHacks; };
+
+      # downstream packages using buildBazelPackage
+      # fixed-output hashes of the fetch phase need to be spot-checked manually
+      downstream = recurseIntoAttrs ({
+        inherit bazel-watcher;
+      }
+          # dm-sonnet is only packaged for linux
+      // (lib.optionalAttrs stdenv.isLinux {
+          # TODO(timokau) dm-sonnet is broken currently
+          # dm-sonnet-linux = python3.pkgs.dm-sonnet;
+      }));
+    };
+
+  src_for_updater = stdenv.mkDerivation rec {
+    name = "updater-sources";
+    inherit src;
+    buildInputs = [ unzip ];
+    inherit sourceRoot;
+    installPhase = ''
+      cp -r . "$out"
+    '';
+  };
+  # update the list of workspace dependencies
+  passthru.updater = writeScript "update-bazel-deps.sh" ''
+    #!${runtimeShell}
+    (cd "${src_for_updater}" &&
+        BAZEL_USE_CPP_ONLY_TOOLCHAIN=1 \
+        "${bazel_3}"/bin/bazel \
+            query 'kind(http_archive, //external:all) + kind(http_file, //external:all) + kind(distdir_tar, //external:all) + kind(git_repository, //external:all)' \
+            --loading_phase_threads=1 \
+            --output build) \
+    | "${python3}"/bin/python3 "${./update-srcDeps.py}" \
+      "${builtins.toString ./src-deps.json}"
+  '';
+
+  # Necessary for the tests to pass on Darwin with sandbox enabled.
+  # Bazel starts a local server and needs to bind a local address.
+  __darwinAllowLocalNetworking = true;
+
+  # Bazel expects several utils to be available in Bash even without PATH. Hence this hack.
+  customBash = writeCBin "bash" ''
+    #include <stdio.h>
+    #include <stdlib.h>
+    #include <string.h>
+    #include <unistd.h>
+
+    extern char **environ;
+
+    int main(int argc, char *argv[]) {
+      char *path = getenv("PATH");
+      char *pathToAppend = "${defaultShellPath}";
+      char *newPath;
+      if (path != NULL) {
+        int length = strlen(path) + 1 + strlen(pathToAppend) + 1;
+        newPath = malloc(length * sizeof(char));
+        snprintf(newPath, length, "%s:%s", path, pathToAppend);
+      } else {
+        newPath = pathToAppend;
+      }
+      setenv("PATH", newPath, 1);
+      execve("${bash}/bin/bash", argv, environ);
+      return 0;
+    }
+  '';
+
+  postPatch = let
+
+    darwinPatches = ''
+      bazelLinkFlags () {
+        eval set -- "$NIX_LDFLAGS"
+        local flag
+        for flag in "$@"; do
+          printf ' -Wl,%s' "$flag"
+        done
+      }
+
+      # Disable Bazel's Xcode toolchain detection which would configure compilers
+      # and linkers from Xcode instead of from PATH
+      export BAZEL_USE_CPP_ONLY_TOOLCHAIN=1
+
+      # Explicitly configure gcov since we don't have it on Darwin, so autodetection fails
+      export GCOV=${coreutils}/bin/false
+
+      # Framework search paths aren't added by bintools hook
+      # https://github.com/NixOS/nixpkgs/pull/41914
+      export NIX_LDFLAGS+=" -F${CoreFoundation}/Library/Frameworks -F${CoreServices}/Library/Frameworks -F${Foundation}/Library/Frameworks"
+
+      # libcxx includes aren't added by libcxx hook
+      # https://github.com/NixOS/nixpkgs/pull/41589
+      export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -isystem ${libcxx}/include/c++/v1"
+
+      # don't use system installed Xcode to run clang, use Nix clang instead
+      sed -i -E "s;/usr/bin/xcrun (--sdk macosx )?clang;${stdenv.cc}/bin/clang $NIX_CFLAGS_COMPILE $(bazelLinkFlags) -framework CoreFoundation;g" \
+        scripts/bootstrap/compile.sh \
+        src/tools/xcode/realpath/BUILD \
+        src/tools/xcode/stdredirect/BUILD \
+        tools/osx/BUILD
+
+      substituteInPlace scripts/bootstrap/compile.sh --replace ' -mmacosx-version-min=10.9' ""
+
+      # nixpkgs's libSystem cannot use pthread headers directly, must import GCD headers instead
+      sed -i -e "/#include <pthread\/spawn.h>/i #include <dispatch/dispatch.h>" src/main/cpp/blaze_util_darwin.cc
+
+      # clang installed from Xcode has a compatibility wrapper that forwards
+      # invocations of gcc to clang, but vanilla clang doesn't
+      sed -i -e 's;_find_generic(repository_ctx, "gcc", "CC", overriden_tools);_find_generic(repository_ctx, "clang", "CC", overriden_tools);g' tools/cpp/unix_cc_configure.bzl
+
+      sed -i -e 's;/usr/bin/libtool;${cctools}/bin/libtool;g' tools/cpp/unix_cc_configure.bzl
+      wrappers=( tools/cpp/osx_cc_wrapper.sh tools/cpp/osx_cc_wrapper.sh.tpl )
+      for wrapper in "''${wrappers[@]}"; do
+        sed -i -e "s,/usr/bin/install_name_tool,${cctools}/bin/install_name_tool,g" $wrapper
+      done
+    '';
+
+    genericPatches = ''
+      # Substitute j2objc and objc wrapper's python shebang to plain python path.
+      # These scripts explicitly depend on Python 2.7, hence we use python27.
+      # See also `postFixup` where python27 is added to $out/nix-support
+      substituteInPlace tools/j2objc/j2objc_header_map.py --replace "$!/usr/bin/python2.7" "#!${python27}/bin/python"
+      substituteInPlace tools/j2objc/j2objc_wrapper.py --replace "$!/usr/bin/python2.7" "#!${python27}/bin/python"
+      substituteInPlace tools/objc/j2objc_dead_code_pruner.py --replace "$!/usr/bin/python2.7" "#!${python27}/bin/python"
+
+      # md5sum is part of coreutils
+      sed -i 's|/sbin/md5|md5sum|' \
+        src/BUILD
+
+      # replace initial value of pythonShebang variable in BazelPythonSemantics.java
+      substituteInPlace src/main/java/com/google/devtools/build/lib/bazel/rules/python/BazelPythonSemantics.java \
+        --replace '"#!/usr/bin/env " + pythonExecutableName' "\"#!${python3}/bin/python\""
+
+      # substituteInPlace is rather slow, so prefilter the files with grep
+      grep -rlZ /bin src/main/java/com/google/devtools | while IFS="" read -r -d "" path; do
+        # If you add more replacements here, you must change the grep above!
+        # Only files containing /bin are taken into account.
+        # We default to python3 where possible. See also `postFixup` where
+        # python3 is added to $out/nix-support
+        substituteInPlace "$path" \
+          --replace /bin/bash ${customBash}/bin/bash \
+          --replace "/usr/bin/env bash" ${customBash}/bin/bash \
+          --replace "/usr/bin/env python" ${python3}/bin/python \
+          --replace /usr/bin/env ${coreutils}/bin/env \
+          --replace /bin/true ${coreutils}/bin/true
+      done
+
+      # bazel test runner include references to /bin/bash
+      substituteInPlace tools/build_rules/test_rules.bzl \
+        --replace /bin/bash ${customBash}/bin/bash
+
+      for i in $(find tools/cpp/ -type f)
+      do
+        substituteInPlace $i \
+          --replace /bin/bash ${customBash}/bin/bash
+      done
+
+      # Fixup scripts that generate scripts. Not fixed up by patchShebangs below.
+      substituteInPlace scripts/bootstrap/compile.sh \
+          --replace /bin/bash ${customBash}/bin/bash
+
+      # add nix environment vars to .bazelrc
+      cat >> .bazelrc <<EOF
+      # Limit the resources Bazel is allowed to use during the build to 1/2 the
+      # available RAM and 3/4 the available CPU cores. This should help avoid
+      # overwhelming the build machine.
+      build --local_ram_resources=HOST_RAM*.5
+      build --local_cpu_resources=HOST_CPUS*.75
+
+      build --distdir=${distDir}
+      fetch --distdir=${distDir}
+      build --copt="$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --copt="/g')"
+      build --host_copt="$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --host_copt="/g')"
+      build --linkopt="$(echo $(< ${stdenv.cc}/nix-support/libcxx-ldflags) | sed -e 's/ /" --linkopt="/g')"
+      build --host_linkopt="$(echo $(< ${stdenv.cc}/nix-support/libcxx-ldflags) | sed -e 's/ /" --host_linkopt="/g')"
+      build --linkopt="-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --linkopt="-Wl,/g')"
+      build --host_linkopt="-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --host_linkopt="-Wl,/g')"
+      build --host_javabase='@local_jdk//:jdk'
+      build --host_java_toolchain='${javaToolchain}'
+      build --verbose_failures
+      EOF
+
+      # add the same environment vars to compile.sh
+      sed -e "/\$command \\\\$/a --copt=\"$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --copt=\"/g')\" \\\\" \
+          -e "/\$command \\\\$/a --host_copt=\"$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --host_copt=\"/g')\" \\\\" \
+          -e "/\$command \\\\$/a --linkopt=\"$(echo $(< ${stdenv.cc}/nix-support/libcxx-ldflags) | sed -e 's/ /" --linkopt=\"/g')\" \\\\" \
+          -e "/\$command \\\\$/a --host_linkopt=\"$(echo $(< ${stdenv.cc}/nix-support/libcxx-ldflags) | sed -e 's/ /" --host_linkopt=\"/g')\" \\\\" \
+          -e "/\$command \\\\$/a --linkopt=\"-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --linkopt=\"-Wl,/g')\" \\\\" \
+          -e "/\$command \\\\$/a --host_linkopt=\"-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --host_linkopt=\"-Wl,/g')\" \\\\" \
+          -e "/\$command \\\\$/a --host_javabase='@local_jdk//:jdk' \\\\" \
+          -e "/\$command \\\\$/a --host_java_toolchain='${javaToolchain}' \\\\" \
+          -e "/\$command \\\\$/a --verbose_failures \\\\" \
+          -i scripts/bootstrap/compile.sh
+
+      # This is necessary to avoid:
+      # "error: no visible @interface for 'NSDictionary' declares the selector
+      # 'initWithContentsOfURL:error:'"
+      # This can be removed when the apple_sdk is upgraded beyond 10.13+
+      sed -i '/initWithContentsOfURL:versionPlistUrl/ {
+        N
+        s/error:nil\];/\];/
+      }' tools/osx/xcode_locator.m
+
+      # append the PATH with defaultShellPath in tools/bash/runfiles/runfiles.bash
+      echo "PATH=\$PATH:${defaultShellPath}" >> runfiles.bash.tmp
+      cat tools/bash/runfiles/runfiles.bash >> runfiles.bash.tmp
+      mv runfiles.bash.tmp tools/bash/runfiles/runfiles.bash
+
+      patchShebangs .
+    '';
+    in lib.optionalString stdenv.hostPlatform.isDarwin darwinPatches
+     + genericPatches;
+
+  buildInputs = [
+    buildJdk
+    python3
+  ];
+
+  # when a command can’t be found in a bazel build, you might also
+  # need to add it to `defaultShellPath`.
+  nativeBuildInputs = [
+    installShellFiles
+    zip
+    python3
+    unzip
+    makeWrapper
+    which
+    customBash
+  ] ++ lib.optionals (stdenv.isDarwin) [ cctools libcxx CoreFoundation CoreServices Foundation ];
+
+  # Bazel makes extensive use of symlinks in the WORKSPACE.
+  # This causes problems with infinite symlinks if the build output is in the same location as the
+  # Bazel WORKSPACE. This is why before executing the build, the source code is moved into a
+  # subdirectory.
+  # Failing to do this causes "infinite symlink expansion detected"
+  preBuildPhases = ["preBuildPhase"];
+  preBuildPhase = ''
+    mkdir bazel_src
+    shopt -s dotglob extglob
+    mv !(bazel_src) bazel_src
+  '';
+  # Needed to build fish completion
+  propagatedBuildInputs = [ python3.pkgs.absl-py ];
+  buildPhase = ''
+    # Increasing memory during compilation might be necessary.
+    # export BAZEL_JAVAC_OPTS="-J-Xmx2g -J-Xms200m"
+
+    # If EMBED_LABEL isn't set, it'd be auto-detected from CHANGELOG.md
+    # and `git rev-parse --short HEAD` which would result in
+    # "3.7.0- (@non-git)" due to non-git build and incomplete changelog.
+    # Actual bazel releases use scripts/release/common.sh which is based
+    # on branch/tag information which we don't have with tarball releases.
+    # Note that .bazelversion is always correct and is based on bazel-*
+    # executable name, version checks should work fine
+    export EMBED_LABEL="${version}- (@non-git)"
+    ${customBash}/bin/bash ./bazel_src/compile.sh
+    ./bazel_src/scripts/generate_bash_completion.sh \
+        --bazel=./bazel_src/output/bazel \
+        --output=./bazel_src/output/bazel-complete.bash \
+        --prepend=./bazel_src/scripts/bazel-complete-header.bash \
+        --prepend=./bazel_src/scripts/bazel-complete-template.bash
+    ${python3}/bin/python3 ./bazel_src/scripts/generate_fish_completion.py \
+        --bazel=./bazel_src/output/bazel \
+        --output=./bazel_src/output/bazel-complete.fish
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+
+    # official wrapper scripts that searches for $WORKSPACE_ROOT/tools/bazel
+    # if it can’t find something in tools, it calls $out/bin/bazel-{version}-{os_arch}
+    # The binary _must_ exist with this naming if your project contains a .bazelversion
+    # file.
+    cp ./bazel_src/scripts/packages/bazel.sh $out/bin/bazel
+    mv ./bazel_src/output/bazel $out/bin/bazel-${version}-${system}-${arch}
+
+    # shell completion files
+    installShellCompletion --bash \
+      --name bazel.bash \
+      ./bazel_src/output/bazel-complete.bash
+    installShellCompletion --zsh \
+      --name _bazel \
+      ./bazel_src/scripts/zsh_completion/_bazel
+    installShellCompletion --fish \
+      --name bazel.fish \
+      ./bazel_src/output/bazel-complete.fish
+  '';
+
+  doInstallCheck = true;
+  installCheckPhase = ''
+    export TEST_TMPDIR=$(pwd)
+
+    hello_test () {
+      $out/bin/bazel test \
+        --test_output=errors \
+        --java_toolchain='${javaToolchain}' \
+        examples/cpp:hello-success_test \
+        examples/java-native/src/test/java/com/example/myproject:hello
+    }
+
+    cd ./bazel_src
+
+    # test whether $WORKSPACE_ROOT/tools/bazel works
+
+    mkdir -p tools
+    cat > tools/bazel <<"EOF"
+    #!${runtimeShell} -e
+    exit 1
+    EOF
+    chmod +x tools/bazel
+
+    # first call should fail if tools/bazel is used
+    ! hello_test
+
+    cat > tools/bazel <<"EOF"
+    #!${runtimeShell} -e
+    exec "$BAZEL_REAL" "$@"
+    EOF
+
+    # second call succeeds because it defers to $out/bin/bazel-{version}-{os_arch}
+    hello_test
+  '';
+
+  # Save paths to hardcoded dependencies so Nix can detect them.
+  postFixup = ''
+    mkdir -p $out/nix-support
+    echo "${customBash} ${defaultShellPath}" >> $out/nix-support/depends
+    # The templates get tar’d up into a .jar,
+    # so nix can’t detect python is needed in the runtime closure
+    # Some of the scripts explicitly depend on Python 2.7. Otherwise, we
+    # default to using python3. Therefore, both python27 and python3 are
+    # runtime dependencies.
+    echo "${python27}" >> $out/nix-support/depends
+    echo "${python3}" >> $out/nix-support/depends
+  '' + lib.optionalString stdenv.isDarwin ''
+    echo "${cctools}" >> $out/nix-support/depends
+  '';
+
+  dontStrip = true;
+  dontPatchELF = true;
+}

pkgs/development/tools/build-managers/bazel/bazel_4/no-arc.patch

···
+--- a/tools/osx/xcode_locator.m	2020-12-10 13:27:29.000000000 +0100
++++ b/tools/osx/xcode_locator.m	2021-02-01 09:09:32.159557051 +0100
+@@ -21,10 +21,6 @@
+ // 6,6.4,6.4.1 = 6.4.1
+ // 6.3,6.3.0 = 6.3
+ 
+-#if !defined(__has_feature) || !__has_feature(objc_arc)
+-#error "This file requires ARC support."
+-#endif
+-
+ #import <CoreServices/CoreServices.h>
+ #import <Foundation/Foundation.h>
+ 
+--- a/tools/osx/xcode_configure.bzl	1980-01-01 01:00:00.000000000 +0100
++++ b/tools/osx/xcode_configure.bzl	2021-02-01 09:36:57.773418444 +0100
+@@ -123,7 +123,6 @@
+         "macosx",
+         "clang",
+         "-mmacosx-version-min=10.9",
+-        "-fobjc-arc",
+         "-framework",
+         "CoreServices",
+         "-framework",
+--- a/tools/osx/BUILD	2021-02-01 11:01:02.191659553 +0100
++++ b/tools/osx/BUILD	2021-02-01 11:04:29.735071019 +0100
+@@ -27,7 +27,7 @@
+ ])
+ 
+ DARWIN_XCODE_LOCATOR_COMPILE_COMMAND = """
+-  /usr/bin/xcrun --sdk macosx clang -mmacosx-version-min=10.9 -fobjc-arc -framework CoreServices \
++  /usr/bin/xcrun --sdk macosx clang -mmacosx-version-min=10.9 -framework CoreServices \
+       -framework Foundation -o $@ $<
+ """
+ 

pkgs/development/tools/build-managers/bazel/bazel_4/src-deps.json

···
+{
+    "1.25.0.zip": {
+        "name": "1.25.0.zip",
+        "sha256": "c78be58f5e0a29a04686b628cf54faaee0094322ae0ac99da5a8a8afca59a647",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_sass/archive/1.25.0.zip",
+            "https://github.com/bazelbuild/rules_sass/archive/1.25.0.zip"
+        ]
+    },
+    "1ef781ced3b1443dca3ed05dec1989eca1a4e1cd.tar.gz": {
+        "name": "1ef781ced3b1443dca3ed05dec1989eca1a4e1cd.tar.gz",
+        "sha256": "5a725b777976b77aa122b707d1b6f0f39b6020f66cd427bb111a585599c857b1",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/stardoc/archive/1ef781ced3b1443dca3ed05dec1989eca1a4e1cd.tar.gz",
+            "https://github.com/bazelbuild/stardoc/archive/1ef781ced3b1443dca3ed05dec1989eca1a4e1cd.tar.gz"
+        ]
+    },
+    "382d5afc60e05470c23e8de19b19fc5ad231e732.tar.gz": {
+        "name": "382d5afc60e05470c23e8de19b19fc5ad231e732.tar.gz",
+        "sha256": "7992217989f3156f8109931c1fc6db3434b7414957cb82371552377beaeb9d6c",
+        "urls": [
+            "https://mirror.bazel.build/github.com/protocolbuffers/upb/archive/382d5afc60e05470c23e8de19b19fc5ad231e732.tar.gz",
+            "https://github.com/protocolbuffers/upb/archive/382d5afc60e05470c23e8de19b19fc5ad231e732.tar.gz"
+        ]
+    },
+    "46993efdd33b73649796c5fc5c9efb193ae19d51.zip": {
+        "name": "46993efdd33b73649796c5fc5c9efb193ae19d51.zip",
+        "sha256": "66184688debeeefcc2a16a2f80b03f514deac8346fe888fb7e691a52c023dd88",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/platforms/archive/46993efdd33b73649796c5fc5c9efb193ae19d51.zip",
+            "https://github.com/bazelbuild/platforms/archive/46993efdd33b73649796c5fc5c9efb193ae19d51.zip"
+        ]
+    },
+    "7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip": {
+        "name": "7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip",
+        "sha256": "bc81f1ba47ef5cc68ad32225c3d0e70b8c6f6077663835438da8d5733f917598",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_java/archive/7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip",
+            "https://github.com/bazelbuild/rules_java/archive/7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip"
+        ]
+    },
+    "7e4afce6fe62dbff0a4a03450143146f9f2d7488.tar.gz": {
+        "name": "7e4afce6fe62dbff0a4a03450143146f9f2d7488.tar.gz",
+        "sha256": "8e7d59a5b12b233be5652e3d29f42fba01c7cbab09f6b3a8d0a57ed6d1e9a0da",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_proto/archive/7e4afce6fe62dbff0a4a03450143146f9f2d7488.tar.gz",
+            "https://github.com/bazelbuild/rules_proto/archive/7e4afce6fe62dbff0a4a03450143146f9f2d7488.tar.gz"
+        ]
+    },
+    "aecba11114cf1fac5497aeb844b6966106de3eb6.tar.gz": {
+        "name": "aecba11114cf1fac5497aeb844b6966106de3eb6.tar.gz",
+        "sha256": "9f385e146410a8150b6f4cb1a57eab7ec806ced48d427554b1e754877ff26c3e",
+        "urls": [
+            "https://mirror.bazel.build/github.com/google/re2/archive/aecba11114cf1fac5497aeb844b6966106de3eb6.tar.gz",
+            "https://github.com/google/re2/archive/aecba11114cf1fac5497aeb844b6966106de3eb6.tar.gz"
+        ]
+    },
+    "android_tools": {
+        "name": "android_tools",
+        "sha256": "ea5c0589a01e2a9f43c20e5c145d3530e3b3bdbe7322789bc5da38d0ca49b837",
+        "url": "https://mirror.bazel.build/bazel_android_tools/android_tools_pkg-0.19.0rc3.tar.gz"
+    },
+    "android_tools_for_testing": {
+        "name": "android_tools_for_testing",
+        "patch_cmds": [
+            "test -f BUILD && chmod u+w BUILD || true",
+            "echo >> BUILD",
+            "echo 'exports_files([\"WORKSPACE\"], visibility = [\"//visibility:public\"])' >> BUILD"
+        ],
+        "patch_cmds_win": [
+            "Add-Content -Path BUILD -Value \"`nexports_files([`\"WORKSPACE`\"], visibility = [`\"//visibility:public`\"])`n\" -Force"
+        ],
+        "sha256": "ea5c0589a01e2a9f43c20e5c145d3530e3b3bdbe7322789bc5da38d0ca49b837",
+        "url": "https://mirror.bazel.build/bazel_android_tools/android_tools_pkg-0.19.0rc3.tar.gz"
+    },
+    "android_tools_pkg-0.19.0rc3.tar.gz": {
+        "name": "android_tools_pkg-0.19.0rc3.tar.gz",
+        "sha256": "ea5c0589a01e2a9f43c20e5c145d3530e3b3bdbe7322789bc5da38d0ca49b837",
+        "urls": [
+            "https://mirror.bazel.build/bazel_android_tools/android_tools_pkg-0.19.0rc3.tar.gz"
+        ]
+    },
+    "b1c40e1de81913a3c40e5948f78719c28152486d.zip": {
+        "name": "b1c40e1de81913a3c40e5948f78719c28152486d.zip",
+        "sha256": "d0c573b94a6ef20ef6ff20154a23d0efcb409fb0e1ff0979cec318dfe42f0cdd",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_cc/archive/b1c40e1de81913a3c40e5948f78719c28152486d.zip",
+            "https://github.com/bazelbuild/rules_cc/archive/b1c40e1de81913a3c40e5948f78719c28152486d.zip"
+        ]
+    },
+    "bazel-skylib-1.0.3.tar.gz": {
+        "name": "bazel-skylib-1.0.3.tar.gz",
+        "sha256": "1c531376ac7e5a180e0237938a2536de0c54d93f5c278634818e0efc952dd56c",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/bazel-skylib/releases/download/1.0.3/bazel-skylib-1.0.3.tar.gz",
+            "https://github.com/bazelbuild/bazel-skylib/releases/download/1.0.3/bazel-skylib-1.0.3.tar.gz"
+        ]
+    },
+    "bazel-toolchains-3.1.0.tar.gz": {
+        "name": "bazel-toolchains-3.1.0.tar.gz",
+        "sha256": "726b5423e1c7a3866a3a6d68e7123b4a955e9fcbe912a51e0f737e6dab1d0af2",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/bazel-toolchains/releases/download/3.1.0/bazel-toolchains-3.1.0.tar.gz",
+            "https://github.com/bazelbuild/bazel-toolchains/releases/download/3.1.0/bazel-toolchains-3.1.0.tar.gz"
+        ]
+    },
+    "bazel_j2objc": {
+        "name": "bazel_j2objc",
+        "sha256": "8d3403b5b7db57e347c943d214577f6879e5b175c2b59b7e075c0b6453330e9b",
+        "strip_prefix": "j2objc-2.5",
+        "urls": [
+            "https://mirror.bazel.build/github.com/google/j2objc/releases/download/2.5/j2objc-2.5.zip",
+            "https://github.com/google/j2objc/releases/download/2.5/j2objc-2.5.zip"
+        ]
+    },
+    "bazel_skylib": {
+        "name": "bazel_skylib",
+        "patch_cmds": [
+            "test -f BUILD && chmod u+w BUILD || true",
+            "echo >> BUILD",
+            "echo 'exports_files([\"WORKSPACE\"], visibility = [\"//visibility:public\"])' >> BUILD"
+        ],
+        "patch_cmds_win": [
+            "Add-Content -Path BUILD -Value \"`nexports_files([`\"WORKSPACE`\"], visibility = [`\"//visibility:public`\"])`n\" -Force"
+        ],
+        "sha256": "1c531376ac7e5a180e0237938a2536de0c54d93f5c278634818e0efc952dd56c",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/bazel-skylib/releases/download/1.0.3/bazel-skylib-1.0.3.tar.gz",
+            "https://github.com/bazelbuild/bazel-skylib/releases/download/1.0.3/bazel-skylib-1.0.3.tar.gz"
+        ]
+    },
+    "bazel_toolchains": {
+        "name": "bazel_toolchains",
+        "patch_cmds": [
+            "test -f BUILD && chmod u+w BUILD || true",
+            "echo >> BUILD",
+            "echo 'exports_files([\"WORKSPACE\"], visibility = [\"//visibility:public\"])' >> BUILD"
+        ],
+        "patch_cmds_win": [
+            "Add-Content -Path BUILD -Value \"`nexports_files([`\"WORKSPACE`\"], visibility = [`\"//visibility:public`\"])`n\" -Force"
+        ],
+        "sha256": "726b5423e1c7a3866a3a6d68e7123b4a955e9fcbe912a51e0f737e6dab1d0af2",
+        "strip_prefix": "bazel-toolchains-3.1.0",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/bazel-toolchains/releases/download/3.1.0/bazel-toolchains-3.1.0.tar.gz",
+            "https://github.com/bazelbuild/bazel-toolchains/releases/download/3.1.0/bazel-toolchains-3.1.0.tar.gz"
+        ]
+    },
+    "bazel_website": {
+        "build_file_content": "\nexports_files([\"_sass/style.scss\"])\n",
+        "name": "bazel_website",
+        "sha256": "a5f531dd1d62e6947dcfc279656ffc2fdf6f447c163914c5eabf7961b4cb6eb4",
+        "strip_prefix": "bazel-website-c174fa288aa079b68416d2ce2cc97268fa172f42",
+        "urls": [
+            "https://github.com/bazelbuild/bazel-website/archive/c174fa288aa079b68416d2ce2cc97268fa172f42.tar.gz"
+        ]
+    },
+    "boringssl": {
+        "generator_function": "grpc_deps",
+        "generator_name": "boringssl",
+        "name": "boringssl",
+        "sha256": "81333e496d7b74a60aa6fa622c028ba382a0a6b9c815cc6ccb221042383b9a9b",
+        "strip_prefix": "boringssl-412844d75b14b9090b58423fd5f5ed8c2fd80212",
+        "urls": [
+            "https://storage.googleapis.com/grpc-bazel-mirror/github.com/google/boringssl/archive/412844d75b14b9090b58423fd5f5ed8c2fd80212.tar.gz",
+            "https://github.com/google/boringssl/archive/412844d75b14b9090b58423fd5f5ed8c2fd80212.tar.gz"
+        ]
+    },
+    "build_bazel_apple_support": {
+        "generator_function": "grpc_deps",
+        "generator_name": "build_bazel_apple_support",
+        "name": "build_bazel_apple_support",
+        "sha256": "122ebf7fe7d1c8e938af6aeaee0efe788a3a2449ece5a8d6a428cb18d6f88033",
+        "urls": [
+            "https://storage.googleapis.com/grpc-bazel-mirror/github.com/bazelbuild/apple_support/releases/download/0.7.1/apple_support.0.7.1.tar.gz",
+            "https://github.com/bazelbuild/apple_support/releases/download/0.7.1/apple_support.0.7.1.tar.gz"
+        ]
+    },
+    "build_bazel_rules_apple": {
+        "generator_function": "grpc_deps",
+        "generator_name": "build_bazel_rules_apple",
+        "name": "build_bazel_rules_apple",
+        "sha256": "bdc8e66e70b8a75da23b79f1f8c6207356df07d041d96d2189add7ee0780cf4e",
+        "strip_prefix": "rules_apple-b869b0d3868d78a1d4ffd866ccb304fb68aa12c3",
+        "urls": [
+            "https://storage.googleapis.com/grpc-bazel-mirror/github.com/bazelbuild/rules_apple/archive/b869b0d3868d78a1d4ffd866ccb304fb68aa12c3.tar.gz",
+            "https://github.com/bazelbuild/rules_apple/archive/b869b0d3868d78a1d4ffd866ccb304fb68aa12c3.tar.gz"
+        ]
+    },
+    "build_bazel_rules_nodejs": {
+        "name": "build_bazel_rules_nodejs",
+        "sha256": "f2194102720e662dbf193546585d705e645314319554c6ce7e47d8b59f459e9c",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_nodejs/releases/download/2.2.2/rules_nodejs-2.2.2.tar.gz",
+            "https://github.com/bazelbuild/rules_nodejs/releases/download/2.2.2/rules_nodejs-2.2.2.tar.gz"
+        ]
+    },
+    "com_github_cares_cares": {
+        "build_file": "@com_github_grpc_grpc//third_party:cares/cares.BUILD",
+        "generator_function": "grpc_deps",
+        "generator_name": "com_github_cares_cares",
+        "name": "com_github_cares_cares",
+        "sha256": "e8c2751ddc70fed9dc6f999acd92e232d5846f009ee1674f8aee81f19b2b915a",
+        "strip_prefix": "c-ares-e982924acee7f7313b4baa4ee5ec000c5e373c30",
+        "urls": [
+            "https://storage.googleapis.com/grpc-bazel-mirror/github.com/c-ares/c-ares/archive/e982924acee7f7313b4baa4ee5ec000c5e373c30.tar.gz",
+            "https://github.com/c-ares/c-ares/archive/e982924acee7f7313b4baa4ee5ec000c5e373c30.tar.gz"
+        ]
+    },
+    "com_github_gflags_gflags": {
+        "generator_function": "grpc_deps",
+        "generator_name": "com_github_gflags_gflags",
+        "name": "com_github_gflags_gflags",
+        "sha256": "63ae70ea3e05780f7547d03503a53de3a7d2d83ad1caaa443a31cb20aea28654",
+        "strip_prefix": "gflags-28f50e0fed19872e0fd50dd23ce2ee8cd759338e",
+        "urls": [
+            "https://storage.googleapis.com/grpc-bazel-mirror/github.com/gflags/gflags/archive/28f50e0fed19872e0fd50dd23ce2ee8cd759338e.tar.gz",
+            "https://github.com/gflags/gflags/archive/28f50e0fed19872e0fd50dd23ce2ee8cd759338e.tar.gz"
+        ]
+    },
+    "com_github_google_benchmark": {
+        "generator_function": "grpc_deps",
+        "generator_name": "com_github_google_benchmark",
+        "name": "com_github_google_benchmark",
+        "sha256": "f68aec93154d010324c05bcd8c5cc53468b87af88d87acb5ddcfaa1bba044837",
+        "strip_prefix": "benchmark-090faecb454fbd6e6e17a75ef8146acb037118d4",
+        "urls": [
+            "https://storage.googleapis.com/grpc-bazel-mirror/github.com/google/benchmark/archive/090faecb454fbd6e6e17a75ef8146acb037118d4.tar.gz",
+            "https://github.com/google/benchmark/archive/090faecb454fbd6e6e17a75ef8146acb037118d4.tar.gz"
+        ]
+    },
+    "com_github_google_re2": {
+        "generator_function": "grpc_deps",
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+        ],
+        "sha256": "9cb078b5026a900d61239c866161f0d9558ec759aa15c5b4c7e905370e868284",
+        "strip_prefix": "zulu14.28.21-ca-jdk14.0.1-win_x64",
+        "urls": [
+            "https://mirror.bazel.build/cdn.azul.com/zulu/bin/zulu14.28.21-ca-jdk14.0.1-win_x64.zip"
+        ]
+    },
+    "remotejdk15_linux_for_testing": {
+        "build_file": "@local_jdk//:BUILD.bazel",
+        "name": "remotejdk15_linux_for_testing",
+        "patch_cmds": [
+            "test -f BUILD.bazel && chmod u+w BUILD.bazel || true",
+            "echo >> BUILD.bazel",
+            "echo 'exports_files([\"WORKSPACE\"], visibility = [\"//visibility:public\"])' >> BUILD.bazel"
+        ],
+        "patch_cmds_win": [
+            "Add-Content -Path BUILD.bazel -Value \"`nexports_files([`\"WORKSPACE`\"], visibility = [`\"//visibility:public`\"])`n\" -Force"
+        ],
+        "sha256": "0a38f1138c15a4f243b75eb82f8ef40855afcc402e3c2a6de97ce8235011b1ad",
+        "strip_prefix": "zulu15.27.17-ca-jdk15.0.0-linux_x64",
+        "urls": [
+            "https://mirror.bazel.build/cdn.azul.com/zulu/bin/zulu15.27.17-ca-jdk15.0.0-linux_x64.tar.gz",
+            "https://cdn.azul.com/zulu/bin/zulu15.27.17-ca-jdk15.0.0-linux_x64.tar.gz"
+        ]
+    },
+    "remotejdk15_macos_for_testing": {
+        "build_file": "@local_jdk//:BUILD.bazel",
+        "name": "remotejdk15_macos_for_testing",
+        "patch_cmds": [
+            "test -f BUILD.bazel && chmod u+w BUILD.bazel || true",
+            "echo >> BUILD.bazel",
+            "echo 'exports_files([\"WORKSPACE\"], visibility = [\"//visibility:public\"])' >> BUILD.bazel"
+        ],
+        "patch_cmds_win": [
+            "Add-Content -Path BUILD.bazel -Value \"`nexports_files([`\"WORKSPACE`\"], visibility = [`\"//visibility:public`\"])`n\" -Force"
+        ],
+        "sha256": "f80b2e0512d9d8a92be24497334c974bfecc8c898fc215ce0e76594f00437482",
+        "strip_prefix": "zulu15.27.17-ca-jdk15.0.0-macosx_x64",
+        "urls": [
+            "https://mirror.bazel.build/cdn.azul.com/zulu/bin/zulu15.27.17-ca-jdk15.0.0-macosx_x64.tar.gz",
+            "https://cdn.azul.com/zulu/bin/zulu15.27.17-ca-jdk15.0.0-macosx_x64.tar.gz"
+        ]
+    },
+    "remotejdk15_win_for_testing": {
+        "build_file": "@local_jdk//:BUILD.bazel",
+        "name": "remotejdk15_win_for_testing",
+        "patch_cmds": [
+            "test -f BUILD.bazel && chmod u+w BUILD.bazel || true",
+            "echo >> BUILD.bazel",
+            "echo 'exports_files([\"WORKSPACE\"], visibility = [\"//visibility:public\"])' >> BUILD.bazel"
+        ],
+        "patch_cmds_win": [
+            "Add-Content -Path BUILD.bazel -Value \"`nexports_files([`\"WORKSPACE`\"], visibility = [`\"//visibility:public`\"])`n\" -Force"
+        ],
+        "sha256": "f535a530151e6c20de8a3078057e332b08887cb3ba1a4735717357e72765cad6",
+        "strip_prefix": "zulu15.27.17-ca-jdk15.0.0-win_x64",
+        "urls": [
+            "https://mirror.bazel.build/cdn.azul.com/zulu/bin/zulu15.27.17-ca-jdk15.0.0-win_x64.zip",
+            "https://cdn.azul.com/zulu/bin/zulu15.27.17-ca-jdk15.0.0-win_x64.zip"
+        ]
+    },
+    "rules_cc": {
+        "name": "rules_cc",
+        "patch_cmds": [
+            "test -f BUILD && chmod u+w BUILD || true",
+            "echo >> BUILD",
+            "echo 'exports_files([\"WORKSPACE\"], visibility = [\"//visibility:public\"])' >> BUILD"
+        ],
+        "patch_cmds_win": [
+            "Add-Content -Path BUILD -Value \"`nexports_files([`\"WORKSPACE`\"], visibility = [`\"//visibility:public`\"])`n\" -Force"
+        ],
+        "sha256": "d0c573b94a6ef20ef6ff20154a23d0efcb409fb0e1ff0979cec318dfe42f0cdd",
+        "strip_prefix": "rules_cc-b1c40e1de81913a3c40e5948f78719c28152486d",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_cc/archive/b1c40e1de81913a3c40e5948f78719c28152486d.zip",
+            "https://github.com/bazelbuild/rules_cc/archive/b1c40e1de81913a3c40e5948f78719c28152486d.zip"
+        ]
+    },
+    "rules_java": {
+        "name": "rules_java",
+        "patch_cmds": [
+            "test -f BUILD && chmod u+w BUILD || true",
+            "echo >> BUILD",
+            "echo 'exports_files([\"WORKSPACE\"], visibility = [\"//visibility:public\"])' >> BUILD"
+        ],
+        "patch_cmds_win": [
+            "Add-Content -Path BUILD -Value \"`nexports_files([`\"WORKSPACE`\"], visibility = [`\"//visibility:public`\"])`n\" -Force"
+        ],
+        "sha256": "bc81f1ba47ef5cc68ad32225c3d0e70b8c6f6077663835438da8d5733f917598",
+        "strip_prefix": "rules_java-7cf3cefd652008d0a64a419c34c13bdca6c8f178",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_java/archive/7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip",
+            "https://github.com/bazelbuild/rules_java/archive/7cf3cefd652008d0a64a419c34c13bdca6c8f178.zip"
+        ]
+    },
+    "rules_nodejs-2.2.2.tar.gz": {
+        "name": "rules_nodejs-2.2.2.tar.gz",
+        "sha256": "f2194102720e662dbf193546585d705e645314319554c6ce7e47d8b59f459e9c",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_nodejs/releases/download/2.2.2/rules_nodejs-2.2.2.tar.gz",
+            "https://github.com/bazelbuild/rules_nodejs/releases/download/2.2.2/rules_nodejs-2.2.2.tar.gz"
+        ]
+    },
+    "rules_pkg": {
+        "name": "rules_pkg",
+        "patch_cmds": [
+            "test -f BUILD && chmod u+w BUILD || true",
+            "echo >> BUILD",
+            "echo 'exports_files([\"WORKSPACE\"], visibility = [\"//visibility:public\"])' >> BUILD"
+        ],
+        "patch_cmds_win": [
+            "Add-Content -Path BUILD -Value \"`nexports_files([`\"WORKSPACE`\"], visibility = [`\"//visibility:public`\"])`n\" -Force"
+        ],
+        "sha256": "4ba8f4ab0ff85f2484287ab06c0d871dcb31cc54d439457d28fd4ae14b18450a",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_pkg/releases/download/0.2.4/rules_pkg-0.2.4.tar.gz",
+            "https://github.com/bazelbuild/rules_pkg/releases/download/0.2.4/rules_pkg-0.2.4.tar.gz"
+        ]
+    },
+    "rules_pkg-0.2.4.tar.gz": {
+        "name": "rules_pkg-0.2.4.tar.gz",
+        "sha256": "4ba8f4ab0ff85f2484287ab06c0d871dcb31cc54d439457d28fd4ae14b18450a",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_pkg/releases/download/0.2.4/rules_pkg-0.2.4.tar.gz",
+            "https://github.com/bazelbuild/rules_pkg/releases/download/0.2.4/rules_pkg-0.2.4.tar.gz"
+        ]
+    },
+    "rules_proto": {
+        "name": "rules_proto",
+        "patch_cmds": [
+            "test -f BUILD.bazel && chmod u+w BUILD.bazel || true",
+            "echo >> BUILD.bazel",
+            "echo 'exports_files([\"WORKSPACE\"], visibility = [\"//visibility:public\"])' >> BUILD.bazel"
+        ],
+        "patch_cmds_win": [
+            "Add-Content -Path BUILD.bazel -Value \"`nexports_files([`\"WORKSPACE`\"], visibility = [`\"//visibility:public`\"])`n\" -Force"
+        ],
+        "sha256": "8e7d59a5b12b233be5652e3d29f42fba01c7cbab09f6b3a8d0a57ed6d1e9a0da",
+        "strip_prefix": "rules_proto-7e4afce6fe62dbff0a4a03450143146f9f2d7488",
+        "urls": [
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_proto/archive/7e4afce6fe62dbff0a4a03450143146f9f2d7488.tar.gz",
+            "https://github.com/bazelbuild/rules_proto/archive/7e4afce6fe62dbff0a4a03450143146f9f2d7488.tar.gz"
+        ]
+    },
+    "six": {
+        "build_file": "@com_github_grpc_grpc//third_party:six.BUILD",
+        "generator_function": "grpc_deps",
+        "generator_name": "six",
+        "name": "six",
+        "sha256": "d16a0141ec1a18405cd4ce8b4613101da75da0e9a7aec5bdd4fa804d0e0eba73",
+        "urls": [
+            "https://files.pythonhosted.org/packages/dd/bf/4138e7bfb757de47d1f4b6994648ec67a51efe58fa907c1e11e350cddfca/six-1.12.0.tar.gz"
+        ]
+    },
+    "upb": {
+        "generator_function": "grpc_deps",
+        "generator_name": "upb",
+        "name": "upb",
+        "sha256": "7992217989f3156f8109931c1fc6db3434b7414957cb82371552377beaeb9d6c",
+        "strip_prefix": "upb-382d5afc60e05470c23e8de19b19fc5ad231e732",
+        "urls": [
+            "https://storage.googleapis.com/grpc-bazel-mirror/github.com/protocolbuffers/upb/archive/382d5afc60e05470c23e8de19b19fc5ad231e732.tar.gz",
+            "https://github.com/protocolbuffers/upb/archive/382d5afc60e05470c23e8de19b19fc5ad231e732.tar.gz"
+        ]
+    },
+    "v1.32.0.tar.gz": {
+        "name": "v1.32.0.tar.gz",
+        "sha256": "f880ebeb2ccf0e47721526c10dd97469200e40b5f101a0d9774eb69efa0bd07a",
+        "urls": [
+            "https://mirror.bazel.build/github.com/grpc/grpc/archive/v1.32.0.tar.gz",
+            "https://github.com/grpc/grpc/archive/v1.32.0.tar.gz"
+        ]
+    },
+    "v3.13.0.tar.gz": {
+        "name": "v3.13.0.tar.gz",
+        "sha256": "9b4ee22c250fe31b16f1a24d61467e40780a3fbb9b91c3b65be2a376ed913a1a",
+        "urls": [
+            "https://mirror.bazel.build/github.com/protocolbuffers/protobuf/archive/v3.13.0.tar.gz",
+            "https://github.com/protocolbuffers/protobuf/archive/v3.13.0.tar.gz"
+        ]
+    },
+    "zlib": {
+        "build_file": "@com_github_grpc_grpc//third_party:zlib.BUILD",
+        "generator_function": "grpc_deps",
+        "generator_name": "zlib",
+        "name": "zlib",
+        "sha256": "6d4d6640ca3121620995ee255945161821218752b551a1a180f4215f7d124d45",
+        "strip_prefix": "zlib-cacf7f1d4e3d44d871b605da3b647f07d718623f",
+        "urls": [
+            "https://storage.googleapis.com/grpc-bazel-mirror/github.com/madler/zlib/archive/cacf7f1d4e3d44d871b605da3b647f07d718623f.tar.gz",
+            "https://github.com/madler/zlib/archive/cacf7f1d4e3d44d871b605da3b647f07d718623f.tar.gz"
+        ]
+    },
+    "zulu11.37.17-ca-jdk11.0.6-linux_x64.tar.gz": {
+        "name": "zulu11.37.17-ca-jdk11.0.6-linux_x64.tar.gz",
+        "sha256": "360626cc19063bc411bfed2914301b908a8f77a7919aaea007a977fa8fb3cde1",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.37.17-ca-jdk11.0.6/zulu11.37.17-ca-jdk11.0.6-linux_x64.tar.gz"
+        ]
+    },
+    "zulu11.37.17-ca-jdk11.0.6-macosx_x64.tar.gz": {
+        "name": "zulu11.37.17-ca-jdk11.0.6-macosx_x64.tar.gz",
+        "sha256": "e1fe56769f32e2aaac95e0a8f86b5a323da5af3a3b4bba73f3086391a6cc056f",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.37.17-ca-jdk11.0.6/zulu11.37.17-ca-jdk11.0.6-macosx_x64.tar.gz"
+        ]
+    },
+    "zulu11.37.17-ca-jdk11.0.6-win_x64.zip": {
+        "name": "zulu11.37.17-ca-jdk11.0.6-win_x64.zip",
+        "sha256": "a9695617b8374bfa171f166951214965b1d1d08f43218db9a2a780b71c665c18",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.37.17-ca-jdk11.0.6/zulu11.37.17-ca-jdk11.0.6-win_x64.zip"
+        ]
+    },
+    "zulu11.37.48-ca-jdk11.0.6-linux_aarch64.tar.gz": {
+        "name": "zulu11.37.48-ca-jdk11.0.6-linux_aarch64.tar.gz",
+        "sha256": "a452f1b9682d9f83c1c14e54d1446e1c51b5173a3a05dcb013d380f9508562e4",
+        "urls": [
+            "https://mirror.bazel.build/openjdk/azul-zulu11.37.48-ca-jdk11.0.6/zulu11.37.48-ca-jdk11.0.6-linux_aarch64.tar.gz"
+        ]
+    }
+}

pkgs/development/tools/build-managers/bazel/bazel_4/update-srcDeps.py

···
+#!/usr/bin/env python3
+import sys
+import json
+
+if len(sys.argv) != 2:
+    print("usage: ./this-script src-deps.json < WORKSPACE", file=sys.stderr)
+    print("Takes the bazel WORKSPACE file and reads all archives into a json dict (by evaling it as python code)", file=sys.stderr)
+    print("Hail Eris.", file=sys.stderr)
+    sys.exit(1)
+
+http_archives = []
+
+# just the kw args are the dict { name, sha256, urls … }
+def http_archive(**kw):
+    http_archives.append(kw)
+# like http_file
+def http_file(**kw):
+    http_archives.append(kw)
+
+# this is inverted from http_archive/http_file and bundles multiple archives
+def distdir_tar(**kw):
+    for archive_name in kw['archives']:
+        http_archives.append({
+            "name": archive_name,
+            "sha256": kw['sha256'][archive_name],
+            "urls": kw['urls'][archive_name]
+        })
+
+# TODO?
+def git_repository(**kw):
+    print(json.dumps(kw, sort_keys=True, indent=4), file=sys.stderr)
+    sys.exit(1)
+
+# execute the WORKSPACE like it was python code in this module,
+# using all the function stubs from above.
+exec(sys.stdin.read())
+
+# transform to a dict with the names as keys
+d = { el['name']: el for el in http_archives }
+
+def has_urls(el):
+    return ('url' in el and el['url']) or ('urls' in el and el['urls'])
+def has_sha256(el):
+    return 'sha256' in el and el['sha256']
+bad_archives = list(filter(lambda el: not has_urls(el) or not has_sha256(el), d.values()))
+if bad_archives:
+    print('Following bazel dependencies are missing url or sha256', file=sys.stderr)
+    print('Check bazel sources for master or non-checksummed dependencies', file=sys.stderr)
+    for el in bad_archives:
+        print(json.dumps(el, sort_keys=True, indent=4), file=sys.stderr)
+    sys.exit(1)
+
+with open(sys.argv[1], "w") as f:
+    print(json.dumps(d, sort_keys=True, indent=4), file=f)

pkgs/development/tools/build-managers/bazel/java-test.nix

···
   ''));
 
   testBazel = bazelTest {
-    name = "bazel-test-cpp";
+    name = "bazel-test-java";
     inherit workspaceDir;
     bazelPkg = bazel;
     buildInputs = [ openjdk8 ];

pkgs/development/tools/build-managers/bazel/protobuf-test.nix

···
   com_google_protobuf = fetchFromGitHub {
     owner = "protocolbuffers";
     repo = "protobuf";
-    rev = "v3.7.0";
-    sha256 = "0nlxif4cajqllsj2vdh7zp14ag48fb8lsa64zmq8625q9m2lcmdh";
+    rev = "v3.13.0";
+    sha256 = "1nqsvi2yfr93kiwlinz8z7c68ilg1j75b2vcpzxzvripxx5h6xhd";
   };
 
   bazel_skylib = fetchFromGitHub {
     owner = "bazelbuild";
     repo = "bazel-skylib";
-    rev = "f83cb8dd6f5658bc574ccd873e25197055265d1c";
-    sha256 = "091fb0ky0956wgv8gghy9ay3yfx6497mb72qvibf0y9dllmxyn9l";
+    rev = "2ec2e6d715e993d96ad6222770805b5bd25399ae";
+    sha256 = "1z2r2vx6kj102zvp3j032djyv99ski1x1sl4i3p6mswnzrzna86s";
+  };
+
+  rules_python = fetchFromGitHub {
+    owner = "bazelbuild";
+    repo = "rules_python";
+    rev = "c8c79aae9aa1b61d199ad03d5fe06338febd0774";
+    sha256 = "1zn58wv5wcylpi0xj7riw34i1jjpqahanxx8y9srwrv0v93b6pqz";
+  };
+
+  rules_proto = fetchFromGitHub {
+    owner = "bazelbuild";
+    repo = "rules_proto";
+    rev = "a0761ed101b939e19d83b2da5f59034bffc19c12";
+    sha256 = "09lqfj5fxm1fywxr5w8pnpqd859gb6751jka9fhxjxjzs33glhqf";
   };
 
   net_zlib = fetchurl rec {
···
 
     load("//:proto-support.bzl", "protobuf_deps")
     protobuf_deps()
-  '';
+    load("@rules_proto//proto:repositories.bzl", "rules_proto_toolchains")
+    rules_proto_toolchains()
+    '';
 
   protoSupport = writeText "proto-support.bzl" ''
     """Load dependencies needed to compile the protobuf library as a 3rd-party consumer."""
···
                 name = "bazel_skylib",
                 path = "${bazel_skylib}",
             )
-
-            native.bind(
-                name = "zlib",
-                actual = "@net_zlib//:zlib",
+            native.local_repository(
+                name = "rules_proto",
+                path = "${rules_proto}",
+            )
+            native.local_repository(
+                name = "rules_python",
+                path = "${rules_python}",
             )
+
             http_archive(
-                name = "net_zlib",
+                name = "zlib",
                 build_file = "@com_google_protobuf//:third_party/zlib.BUILD",
                 sha256 = "${net_zlib.sha256}",
                 strip_prefix = "zlib-1.2.11",
···
   '';
 
   personBUILD = writeText "BUILD" ''
+    load("@rules_proto//proto:defs.bzl", "proto_library")
+
     proto_library(
         name = "person_proto",
         srcs = ["person.proto"],

pkgs/top-level/all-packages.nix

···
     bazel_self = bazel_3;
   };
 
+  bazel_4 = callPackage ../development/tools/build-managers/bazel/bazel_4 {
+    inherit (darwin) cctools;
+    inherit (darwin.apple_sdk.frameworks) CoreFoundation CoreServices Foundation;
+    buildJdk = jdk11_headless;
+    buildJdkName = "java11";
+    runJdk = jdk11_headless;
+    stdenv = if stdenv.cc.isClang then llvmPackages.stdenv else stdenv;
+    bazel_self = bazel_4;
+  };
+
   bazel-buildtools = callPackage ../development/tools/build-managers/bazel/buildtools { };
   buildifier = bazel-buildtools;
   buildozer = bazel-buildtools;