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# Copyright 2019 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
# Wraps a target and any of its arguments to an executable script.
#
# Many executable targets have build-time-constant arguments. This
# template allows those to be wrapped into a single, user- or bot-friendly
# script at build time.
#
# Paths to be wrapped should be relative to root_build_dir and should be
# wrapped in "@WrappedPath(...)"; see Example below.
#
# Variables:
# generator_script: Path to the script to use to perform the wrapping.
# Defaults to //build/util/generate_wrapper.py. Generally should only
# be set by other templates.
# wrapper_script: Output path.
# executable: Path to the executable to wrap. Can be a script or a
# build product. Paths can be relative to the containing gn file
# or source-absolute.
# executable_args: List of arguments to write into the wrapper.
#
# Example wrapping a checked-in script:
# generate_wrapper("sample_wrapper") {
# executable = "//for/bar/sample.py"
# wrapper_script = "$root_build_dir/bin/run_sample"
#
# _sample_argument_path = "//sample/$target_cpu/lib/sample_lib.so"
# _rebased_sample_argument_path = rebase_path(
# _sample_argument_path,
# root_build_dir)
# executable_args = [
# "--sample-lib", "@WrappedPath(${_rebased_sample_argument_path})",
# ]
# }
#
# Example wrapping a build product:
# generate_wrapper("sample_wrapper") {
# executable = "$root_build_dir/sample_build_product"
# wrapper_script = "$root_build_dir/bin/run_sample_build_product"
# }
template("generate_wrapper") {
_generator_script = "//build/util/generate_wrapper.py"
if (defined(invoker.generator_script)) {
_generator_script = invoker.generator_script
}
_executable_to_wrap = invoker.executable
_wrapper_script = invoker.wrapper_script
if (is_win) {
_wrapper_script += ".bat"
}
if (defined(invoker.executable_args)) {
_wrapped_arguments = invoker.executable_args
} else {
_wrapped_arguments = []
}
action(target_name) {
forward_variables_from(invoker,
[
"data",
"data_deps",
"deps",
"sources",
"testonly",
])
script = _generator_script
if (!defined(data)) {
data = []
}
data += [ _wrapper_script ]
outputs = [
_wrapper_script,
]
_rebased_executable_to_wrap =
rebase_path(_executable_to_wrap, root_build_dir)
_rebased_wrapper_script = rebase_path(_wrapper_script, root_build_dir)
if (is_win) {
_script_language = "batch"
} else {
_script_language = "bash"
}
args = [
"--executable",
"@WrappedPath(${_rebased_executable_to_wrap})",
"--wrapper-script",
_rebased_wrapper_script,
"--output-directory",
rebase_path(root_build_dir, root_build_dir),
"--script-language",
_script_language,
"--",
]
args += _wrapped_arguments
}
}
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