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emscripten-core
GitHub Repository: emscripten-core/emscripten
 Path: blob/main/system/lib/update_musl.py
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#!/usr/bin/env python3

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# Copyright 2021 The Emscripten Authors.  All rights reserved.

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# Emscripten is available under two separate licenses, the MIT license and the

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# University of Illinois/NCSA Open Source License.  Both these licenses can be

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# found in the LICENSE file.

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"""Simple script for updating musl from external git repo.

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The upstream sources, along with our local changes, live at:

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  https://github.com/emscripten-core/musl

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To update musl first make sure all changes from the emscripten repo

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are present in the `emscripten` branch of the above repo.  Then run

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`git merge v<musl_version>` to pull in the latest musl changes from

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a given musl version.  Once any merge conflict are resolved those

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change can then be copied back into emscripten using this script.

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"""

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import os

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import sys

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import shutil

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script_dir = os.path.abspath(os.path.dirname(__file__))

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local_src = os.path.join(script_dir, 'libc', 'musl')

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emscripten_root = os.path.dirname(os.path.dirname(script_dir))

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default_musl_dir = os.path.join(os.path.dirname(emscripten_root), 'musl')

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exclude_dirs = (

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  # Top level directories we don't include

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  'tools', 'obj', 'lib', 'crt', 'musl', 'compat',

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  # Parts of src we don't build

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  'malloc',

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  # Arch-specific code we don't use

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  'arm', 'x32', 'sh', 'i386', 'x86_64', 'aarch64', 'riscv64',

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  's390x', 'mips', 'mips64', 'mipsn32', 'powerpc', 'powerpc64',

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  'm68k', 'microblaze', 'or1k')

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exclude_files = (

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  'aio.h',

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  'sendfile.h',

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  'auxv.h',

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  'personality.h',

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  'klog.h',

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  'fanotify.h',

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  'vt.h',

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  'swap.h',

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  'reboot.h',

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  'quota.h',

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  'kd.h',

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  'io.h',

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  'fsuid.h',

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  'epoll.h',

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  'inotify.h',

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  'timerfd.h',

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  'timex.h',

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  'cachectl.h',

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  'soundcard.h',

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  'eventfd.h',

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  'signalfd.h',

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  'ptrace.h',

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  'prctl.h',

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)

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if len(sys.argv) > 1:

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  musl_dir = os.path.abspath(sys.argv[1])

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else:

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  musl_dir = default_musl_dir

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def should_ignore(name):

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  return name in exclude_dirs or name[0] == '.' or name in exclude_files

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def ignore(dirname, contents):

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  return [c for c in contents if should_ignore(c)]

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def main():

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  assert os.path.exists(musl_dir)

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  # Remove old version

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  shutil.rmtree(local_src)

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  # Copy new version into place

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  shutil.copytree(musl_dir, local_src, ignore=ignore)

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  # Create version.h

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  version = open(os.path.join(local_src, 'VERSION')).read().strip()

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  with open(os.path.join(local_src, 'src', 'internal', 'version.h'), 'w') as f:

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    f.write('#define VERSION "%s"\n' % version)

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if __name__ == '__main__':

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  main()

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