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Karim Alweheshy
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Add custom toolchain rule and tests
Signed-off-by: Karim Alweheshy <[email protected]>
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‎test/internal/custom_toolchain/BUILD

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# buildifier: disable=bzl-visibility
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load("//xcodeproj/internal:custom_toolchain.bzl", "custom_toolchain")
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# Example swiftc override for testing
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filegroup(
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name = "test_swiftc",
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srcs = ["test_swiftc.sh"],
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visibility = ["//visibility:public"],
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)
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# Test target for custom_toolchain
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custom_toolchain(
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name = "test_toolchain",
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overrides = {
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# Key is a label target, value is the tool name
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":test_swiftc": "swiftc",
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},
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toolchain_name = "TestCustomToolchain",
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)
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# Add a simple test rule that depends on the toolchain
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sh_test(
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name = "custom_toolchain_test",
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srcs = ["custom_toolchain_test.sh"],
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args = ["$(location :test_toolchain)"],
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data = [":test_toolchain"],
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)

‎test/internal/custom_toolchain/custom_toolchain_test.sh

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#!/bin/bash
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set -euo pipefail
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# The first argument should be the path to the toolchain directory
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TOOLCHAIN_DIR="$1"
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echo "Verifying toolchain at: $TOOLCHAIN_DIR"
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# Check that the toolchain directory exists
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if [[ ! -d "$TOOLCHAIN_DIR" ]]; then
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echo "ERROR: Toolchain directory does not exist: $TOOLCHAIN_DIR"
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exit 1
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fi
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# Check that ToolchainInfo.plist exists
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if [[ ! -f "$TOOLCHAIN_DIR/ToolchainInfo.plist" ]]; then
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echo "ERROR: ToolchainInfo.plist not found in toolchain"
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exit 1
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fi
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# Check for correct identifiers in the plist
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if ! grep -q "BazelRulesXcodeProj" "$TOOLCHAIN_DIR/ToolchainInfo.plist"; then
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echo "ERROR: ToolchainInfo.plist doesn't contain BazelRulesXcodeProj"
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exit 1
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fi
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# Check that our custom swiftc is properly linked/copied
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if [[ ! -f "$TOOLCHAIN_DIR/usr/bin/swiftc" ]]; then
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echo "ERROR: swiftc not found in toolchain"
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exit 1
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fi
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# Ensure swiftc is executable
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if [[ ! -x "$TOOLCHAIN_DIR/usr/bin/swiftc" ]]; then
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echo "ERROR: swiftc is not executable"
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exit 1
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fi
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# Test if the swiftc actually runs
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if ! "$TOOLCHAIN_DIR/usr/bin/swiftc" --version > /dev/null 2>&1; then
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echo "WARN: swiftc doesn't run correctly, but this is expected in tests"
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fi
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echo "Custom toolchain validation successful!"
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exit 0

‎test/internal/custom_toolchain/test_swiftc.sh

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#!/bin/bash
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# This is a test script that simulates a custom Swift compiler
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# It will be used as an override in the custom toolchain
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# Print inputs for debugging
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echo "Custom swiftc called with args: $@" >&2
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# In a real override, you would do something meaningful with the args
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# For testing, just exit successfully
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exit 0

‎xcodeproj/internal/custom_toolchain.bzl

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"""Implementation of the `custom_toolchain` rule."""
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def _get_xcode_product_version(*, xcode_config):
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raw_version = str(xcode_config.xcode_version())
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if not raw_version:
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fail("""\
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`xcode_config.xcode_version` was not set. This is a bazel bug. Try again.
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""")
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version_components = raw_version.split(".")
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if len(version_components) < 4:
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# This will result in analysis cache misses, but it's better than
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# failing
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return raw_version
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return version_components[3]
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def _custom_toolchain_impl(ctx):
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xcode_version = _get_xcode_product_version(
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xcode_config = ctx.attr._xcode_config[apple_common.XcodeVersionConfig],
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)
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toolchain_name_base = ctx.attr.toolchain_name
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toolchain_dir = ctx.actions.declare_directory(
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toolchain_name_base + "{}".format(xcode_version) + ".xctoolchain",
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)
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resolved_overrides = {}
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override_files = []
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for tool_target, tool_name in ctx.attr.overrides.items():
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files = tool_target.files.to_list()
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if not files:
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fail("ERROR: Override for '{}' does not produce any files!".format(tool_name))
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if len(files) > 1:
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fail("ERROR: Override for '{}' produces multiple files ({}). Each override must have exactly one file.".format(
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tool_name,
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len(files),
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))
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override_file = files[0]
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override_files.append(override_file)
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resolved_overrides[tool_name] = override_file.path
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overrides_list = " ".join(["{}={}".format(k, v) for k, v in resolved_overrides.items()])
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script_file = ctx.actions.declare_file(toolchain_name_base + "_setup.sh")
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ctx.actions.expand_template(
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template = ctx.file._symlink_template,
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output = script_file,
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is_executable = True,
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substitutions = {
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"%overrides_list%": overrides_list,
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"%toolchain_dir%": toolchain_dir.path,
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"%toolchain_name_base%": toolchain_name_base,
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"%xcode_version%": xcode_version,
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},
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)
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ctx.actions.run_shell(
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outputs = [toolchain_dir],
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inputs = override_files,
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tools = [script_file],
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mnemonic = "CreateCustomToolchain",
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command = script_file.path,
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execution_requirements = {
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"local": "1",
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"no-cache": "1",
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"no-sandbox": "1",
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"requires-darwin": "1",
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},
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use_default_shell_env = True,
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)
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# Create runfiles with the override files and script file
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runfiles = ctx.runfiles(files = override_files + [script_file])
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return [DefaultInfo(
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files = depset([toolchain_dir]),
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runfiles = runfiles,
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)]
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custom_toolchain = rule(
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implementation = _custom_toolchain_impl,
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attrs = {
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"overrides": attr.label_keyed_string_dict(
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allow_files = True,
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mandatory = False,
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default = {},
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),
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"toolchain_name": attr.string(mandatory = True),
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"_symlink_template": attr.label(
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allow_single_file = True,
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default = Label("//xcodeproj/internal/templates:custom_toolchain_symlink.sh"),
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),
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"_xcode_config": attr.label(
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default = configuration_field(
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name = "xcode_config_label",
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fragment = "apple",
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),
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),
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},
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)

‎xcodeproj/internal/templates/custom_toolchain_symlink.sh

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#!/bin/bash
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set -e
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# Define constants within the script
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TOOLCHAIN_NAME_BASE="%toolchain_name_base%"
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TOOLCHAIN_DIR="%toolchain_dir%"
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XCODE_VERSION="%xcode_version%"
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# Get Xcode version and default toolchain path
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DEFAULT_TOOLCHAIN=$(xcrun --find clang | sed 's|/usr/bin/clang$||')
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XCODE_RAW_VERSION=$(xcodebuild -version | head -n 1)
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# Define toolchain names
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HOME_TOOLCHAIN_NAME="BazelRulesXcodeProj${XCODE_VERSION}"
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USER_TOOLCHAIN_PATH="/Users/$(id -un)/Library/Developer/Toolchains/${HOME_TOOLCHAIN_NAME}.xctoolchain"
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BUILT_TOOLCHAIN_PATH="$PWD/$TOOLCHAIN_DIR"
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mkdir -p "$TOOLCHAIN_DIR"
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# Process all files from the default toolchain
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find "$DEFAULT_TOOLCHAIN" -type f -o -type l | while read -r file; do
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base_name="$(basename "$file")"
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rel_path="${file#"$DEFAULT_TOOLCHAIN/"}"
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# Skip ToolchainInfo.plist as we'll create our own
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if [[ "$rel_path" == "ToolchainInfo.plist" ]]; then
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continue
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fi
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# Ensure parent directory exists
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mkdir -p "$TOOLCHAIN_DIR/$(dirname "$rel_path")"
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# Process overrides
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override_found=false
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while IFS='=' read -r key value; do
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if [[ "$key" == "$base_name" ]]; then
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value="$PWD/$value"
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cp "$value" "$TOOLCHAIN_DIR/$rel_path"
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# Make executable if original is executable
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if [[ -x "$file" ]]; then
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chmod +x "$TOOLCHAIN_DIR/$rel_path"
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fi
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override_found=true
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break
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fi
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done <<< "%overrides_list%"
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# If no override found, symlink the original
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if [[ "$override_found" == "false" ]]; then
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ln -sf "$file" "$TOOLCHAIN_DIR/$rel_path"
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fi
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done
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# Generate the ToolchainInfo.plist directly with Xcode version information
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cat > "$TOOLCHAIN_DIR/ToolchainInfo.plist" << EOF
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
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<plist version="1.0">
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<dict>
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<key>Aliases</key>
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<array>
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<string>${HOME_TOOLCHAIN_NAME}</string>
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</array>
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<key>CFBundleIdentifier</key>
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<string>com.rules_xcodeproj.BazelRulesXcodeProj.${XCODE_VERSION}</string>
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<key>CompatibilityVersion</key>
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<integer>2</integer>
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<key>CompatibilityVersionDisplayString</key>
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<string>${XCODE_RAW_VERSION}</string>
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<key>DisplayName</key>
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<string>${HOME_TOOLCHAIN_NAME}</string>
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<key>ReportProblemURL</key>
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<string>https://github.com/MobileNativeFoundation/rules_xcodeproj</string>
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<key>ShortDisplayName</key>
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<string>${HOME_TOOLCHAIN_NAME}</string>
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<key>Version</key>
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<string>0.1.0</string>
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</dict>
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</plist>
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EOF
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mkdir -p "$(dirname "$USER_TOOLCHAIN_PATH")"
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if [[ -e "$USER_TOOLCHAIN_PATH" || -L "$USER_TOOLCHAIN_PATH" ]]; then
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rm -rf "$USER_TOOLCHAIN_PATH"
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fi
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ln -sf "$BUILT_TOOLCHAIN_PATH" "$USER_TOOLCHAIN_PATH"

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