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# Copyright 2021 The Bazel Authors. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""APIs for operating on universal binaries with `lipo`."""
load(
"@bazel_skylib//lib:shell.bzl",
"shell",
)
load(":apple_support.bzl", "apple_support")
def _create(
*,
actions,
inputs,
output,
apple_fragment,
xcode_config):
"""Creates a universal binary by combining other binaries.
Args:
actions: The `Actions` object used to register actions.
inputs: A sequence or `depset` of `File`s that represent binaries to
be combined. As with the `lipo` tool's `-create` command (when
invoked without the `-arch` option) all of the architectures in
each input file will be copied into the output file (so the inputs
may be either single-architecture binaries or universal binaries).
output: A `File` representing the universal binary that will be the
output of the action.
apple_fragment: The `apple` configuration fragment used to configure
the action environment.
xcode_config: The `apple_common.XcodeVersionConfig` provider used to
configure the action environment.
"""
if not inputs:
fail("lipo.create requires at least one input file.")
# Explicitly create the containing directory to avoid an occasional error
# from lipo; "can't create temporary output file [...] (Permission denied)"
command = [
"mkdir -p {} &&".format(shell.quote(output.dirname)),
"/usr/bin/lipo",
"-create",
]
command.extend([
shell.quote(input_file.path)
for input_file in inputs
])
command.extend(["-output", shell.quote(output.path)])
apple_support.run_shell(
actions = actions,
command = " ".join(command),
mnemonic = "AppleLipo",
inputs = inputs,
outputs = [output],
apple_fragment = apple_fragment,
xcode_config = xcode_config,
)
def _extract_or_thin(
*,
actions,
apple_fragment,
archs,
input_shell_expression = None,
input_file = None,
output,
xcode_config):
"""Extracts a subset of an existing universal binary based on the set of incoming architectures.
Args:
actions: The `Actions` object used to register actions.
apple_fragment: The `apple` configuration fragment used to configure the action environment.
archs: A list of strings that indicates the exact set of architectures we need to create the
output binary. As with the `lipo` tool's `-extract` command, all of the selected
architectures indicated by `archs` in the universal binary will be copied into the
output file. If only one architecture is selected, this will be rely on the `lipo`
tool's `-thin` command instead.
input_shell_expression: A string that represent the universal binary to be extracted. Use
only if the input cannot be represented adequately as a file, i.e. if `$SDKROOT` is
required to get at its path. Required if the `input_file` is not set.
input_file: A `File` that represents the universal binary to be extracted. Required if the
`input_command` is not set.
output: A `File` representing the universal binary that will be the output of the action.
xcode_config: The `apple_common.XcodeVersionConfig` provider used to configure the action
environment.
"""
if not input_file and not input_shell_expression:
fail("lipo.extract_or_thin needs a fat binary in `input_file` or `input_shell_expression`.")
if input_file and input_shell_expression:
fail("""
lipo.extract_or_thin cannot use `input_file` along with `input_shell_expression` simultaneously.
Please use only `input_file` or `input_shell_expression` to express the intended input.
""")
if not archs:
fail("lipo.extract_or_thin requires at least one arch.")
# Explicitly create the containing directory if it doesn't exist, otherwise the following error
# can come from lipo; "can't create temporary output file [...] (Permission denied)"
command = [
"mkdir -p {} &&".format(shell.quote(output.dirname)),
"/usr/bin/lipo",
]
if input_file:
command.append(shell.quote(input_file.path))
else:
command.append(input_shell_expression)
if len(archs) == 1:
command.extend(["-thin", archs[0]])
else:
for arch in archs:
command.extend(["-extract", arch])
command.extend(["-output", shell.quote(output.path)])
extra_args = {}
if input_file:
extra_args["inputs"] = [input_file]
apple_support.run_shell(
actions = actions,
command = " ".join(command),
mnemonic = "AppleLipoExtract",
outputs = [output],
apple_fragment = apple_fragment,
xcode_config = xcode_config,
**extra_args
)
# TODO(apple-rules-team): Add support for other mutating operations here if
# there is a need: extract_family, remove, replace.
lipo = struct(
create = _create,
extract_or_thin = _extract_or_thin,
)
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