1  #!/usr/bin/env python3
 2  import argparse
 3  import plistlib
 4  import pathlib
 5  import tarfile
 6  import os
 7  import contextlib
 8  
 9  @contextlib.contextmanager
10  def cd(path):
11      """Context manager that restores PWD even if an exception was raised."""
12      old_pwd = os.getcwd()
13      os.chdir(str(path))
14      try:
15          yield
16      finally:
17          os.chdir(old_pwd)
18  
19  def run():
20      parser = argparse.ArgumentParser(
21          description=__doc__, formatter_class=argparse.RawTextHelpFormatter)
22  
23      parser.add_argument('xcode_app', metavar='XCODEAPP', type=pathlib.Path)
24      parser.add_argument("-o", metavar='OUTSDKTAR', dest='out_sdkt', type=pathlib.Path, required=False)
25  
26      args = parser.parse_args()
27  
28      xcode_app = args.xcode_app.resolve()
29      assert xcode_app.is_dir(), "The supplied Xcode.app path '{}' either does not exist or is not a directory".format(xcode_app)
30  
31      xcode_app_plist = xcode_app.joinpath("Contents/version.plist")
32      with xcode_app_plist.open('rb') as fp:
33          pl = plistlib.load(fp)
34          xcode_version = pl['CFBundleShortVersionString']
35          xcode_build_id = pl['ProductBuildVersion']
36      print("Found Xcode (version: {xcode_version}, build id: {xcode_build_id})".format(xcode_version=xcode_version, xcode_build_id=xcode_build_id))
37  
38      sdk_dir = xcode_app.joinpath("Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk")
39      sdk_plist = sdk_dir.joinpath("System/Library/CoreServices/SystemVersion.plist")
40      with sdk_plist.open('rb') as fp:
41          pl = plistlib.load(fp)
42          sdk_version = pl['ProductVersion']
43          sdk_build_id = pl['ProductBuildVersion']
44      print("Found MacOSX SDK (version: {sdk_version}, build id: {sdk_build_id})".format(sdk_version=sdk_version, sdk_build_id=sdk_build_id))
45  
46      out_name = "Xcode-{xcode_version}-{xcode_build_id}-extracted-SDK-with-libcxx-headers".format(xcode_version=xcode_version, xcode_build_id=xcode_build_id)
47  
48      out_sdkt_path = args.out_sdkt or pathlib.Path("./{}.tar".format(out_name))
49  
50      def tarfp_add_with_base_change(tarfp, dir_to_add, alt_base_dir):
51          """Add all files in dir_to_add to tarfp, but prepend alt_base_dir to the files'
52          names
53  
54          e.g. if the only file under /root/bazdir is /root/bazdir/qux, invoking:
55  
56              tarfp_add_with_base_change(tarfp, "foo/bar", "/root/bazdir")
57  
58          would result in the following members being added to tarfp:
59  
60              foo/bar/             -> corresponding to /root/bazdir
61              foo/bar/qux          -> corresponding to /root/bazdir/qux
62  
63          """
64          def change_tarinfo_base(tarinfo):
65              if tarinfo.name and tarinfo.name.endswith((".swiftmodule", ".modulemap")):
66                  return None
67              if tarinfo.name and tarinfo.name.startswith("./"):
68                  tarinfo.name = str(pathlib.Path(alt_base_dir, tarinfo.name))
69              if tarinfo.linkname and tarinfo.linkname.startswith("./"):
70                  tarinfo.linkname = str(pathlib.Path(alt_base_dir, tarinfo.linkname))
71              # make metadata deterministic
72              tarinfo.mtime = 0
73              tarinfo.uid, tarinfo.uname =  0, ''
74              tarinfo.gid, tarinfo.gname = 0, ''
75              # don't use isdir() as there are also executable files present
76              tarinfo.mode = 0o0755 if tarinfo.mode & 0o0100 else 0o0644
77              return tarinfo
78          with cd(dir_to_add):
79              # recursion already adds entries in sorted order
80              tarfp.add("./usr/include", recursive=True, filter=change_tarinfo_base)
81              tarfp.add("./usr/lib", recursive=True, filter=change_tarinfo_base)
82              tarfp.add("./System/Library/Frameworks", recursive=True, filter=change_tarinfo_base)
83  
84      print("Creating output .tar file...")
85      with out_sdkt_path.open("wb") as fp:
86          with tarfile.open(mode="w", fileobj=fp, format=tarfile.PAX_FORMAT) as tarfp:
87              print("Adding MacOSX SDK {} files...".format(sdk_version))
88              tarfp_add_with_base_change(tarfp, sdk_dir, out_name)
89      print("Done! Find the resulting tarball at:")
90      print(out_sdkt_path.resolve())
91  
92  if __name__ == '__main__':
93      run()