djavu-asus/emacs/elpy/rpc-venv/lib/python3.11/site-packages/setuptools/archive_util.py

   1 """Utilities for extracting common archive formats"""
   2
   3 import zipfile
   4 import tarfile
   5 import os
   6 import shutil
   7 import posixpath
   8 import contextlib
   9 from distutils.errors import DistutilsError
  10
  11 from ._path import ensure_directory
  12
  13 __all__ = [
  14     "unpack_archive", "unpack_zipfile", "unpack_tarfile", "default_filter",
  15     "UnrecognizedFormat", "extraction_drivers", "unpack_directory",
  16 ]
  17
  18
  19 class UnrecognizedFormat(DistutilsError):
  20     """Couldn't recognize the archive type"""
  21
  22
  23 def default_filter(src, dst):
  24     """The default progress/filter callback; returns True for all files"""
  25     return dst
  26
  27
  28 def unpack_archive(
  29         filename, extract_dir, progress_filter=default_filter,
  30         drivers=None):
  31     """Unpack `filename` to `extract_dir`, or raise ``UnrecognizedFormat``
  32
  33     `progress_filter` is a function taking two arguments: a source path
  34     internal to the archive ('/'-separated), and a filesystem path where it
  35     will be extracted.  The callback must return the desired extract path
  36     (which may be the same as the one passed in), or else ``None`` to skip
  37     that file or directory.  The callback can thus be used to report on the
  38     progress of the extraction, as well as to filter the items extracted or
  39     alter their extraction paths.
  40
  41     `drivers`, if supplied, must be a non-empty sequence of functions with the
  42     same signature as this function (minus the `drivers` argument), that raise
  43     ``UnrecognizedFormat`` if they do not support extracting the designated
  44     archive type.  The `drivers` are tried in sequence until one is found that
  45     does not raise an error, or until all are exhausted (in which case
  46     ``UnrecognizedFormat`` is raised).  If you do not supply a sequence of
  47     drivers, the module's ``extraction_drivers`` constant will be used, which
  48     means that ``unpack_zipfile`` and ``unpack_tarfile`` will be tried, in that
  49     order.
  50     """
  51     for driver in drivers or extraction_drivers:
  52         try:
  53             driver(filename, extract_dir, progress_filter)
  54         except UnrecognizedFormat:
  55             continue
  56         else:
  57             return
  58     else:
  59         raise UnrecognizedFormat(
  60             "Not a recognized archive type: %s" % filename
  61         )
  62
  63
  64 def unpack_directory(filename, extract_dir, progress_filter=default_filter):
  65     """"Unpack" a directory, using the same interface as for archives
  66
  67     Raises ``UnrecognizedFormat`` if `filename` is not a directory
  68     """
  69     if not os.path.isdir(filename):
  70         raise UnrecognizedFormat("%s is not a directory" % filename)
  71
  72     paths = {
  73         filename: ('', extract_dir),
  74     }
  75     for base, dirs, files in os.walk(filename):
  76         src, dst = paths[base]
  77         for d in dirs:
  78             paths[os.path.join(base, d)] = src + d + '/', os.path.join(dst, d)
  79         for f in files:
  80             target = os.path.join(dst, f)
  81             target = progress_filter(src + f, target)
  82             if not target:
  83                 # skip non-files
  84                 continue
  85             ensure_directory(target)
  86             f = os.path.join(base, f)
  87             shutil.copyfile(f, target)
  88             shutil.copystat(f, target)
  89
  90
  91 def unpack_zipfile(filename, extract_dir, progress_filter=default_filter):
  92     """Unpack zip `filename` to `extract_dir`
  93
  94     Raises ``UnrecognizedFormat`` if `filename` is not a zipfile (as determined
  95     by ``zipfile.is_zipfile()``).  See ``unpack_archive()`` for an explanation
  96     of the `progress_filter` argument.
  97     """
  98
  99     if not zipfile.is_zipfile(filename):
 100         raise UnrecognizedFormat("%s is not a zip file" % (filename,))
 101
 102     with zipfile.ZipFile(filename) as z:
 103         _unpack_zipfile_obj(z, extract_dir, progress_filter)
 104
 105
 106 def _unpack_zipfile_obj(zipfile_obj, extract_dir, progress_filter=default_filter):
 107     """Internal/private API used by other parts of setuptools.
 108     Similar to ``unpack_zipfile``, but receives an already opened :obj:`zipfile.ZipFile`
 109     object instead of a filename.
 110     """
 111     for info in zipfile_obj.infolist():
 112         name = info.filename
 113
 114         # don't extract absolute paths or ones with .. in them
 115         if name.startswith('/') or '..' in name.split('/'):
 116             continue
 117
 118         target = os.path.join(extract_dir, *name.split('/'))
 119         target = progress_filter(name, target)
 120         if not target:
 121             continue
 122         if name.endswith('/'):
 123             # directory
 124             ensure_directory(target)
 125         else:
 126             # file
 127             ensure_directory(target)
 128             data = zipfile_obj.read(info.filename)
 129             with open(target, 'wb') as f:
 130                 f.write(data)
 131         unix_attributes = info.external_attr >> 16
 132         if unix_attributes:
 133             os.chmod(target, unix_attributes)
 134
 135
 136 def _resolve_tar_file_or_dir(tar_obj, tar_member_obj):
 137     """Resolve any links and extract link targets as normal files."""
 138     while tar_member_obj is not None and (
 139             tar_member_obj.islnk() or tar_member_obj.issym()):
 140         linkpath = tar_member_obj.linkname
 141         if tar_member_obj.issym():
 142             base = posixpath.dirname(tar_member_obj.name)
 143             linkpath = posixpath.join(base, linkpath)
 144             linkpath = posixpath.normpath(linkpath)
 145         tar_member_obj = tar_obj._getmember(linkpath)
 146
 147     is_file_or_dir = (
 148         tar_member_obj is not None and
 149         (tar_member_obj.isfile() or tar_member_obj.isdir())
 150     )
 151     if is_file_or_dir:
 152         return tar_member_obj
 153
 154     raise LookupError('Got unknown file type')
 155
 156
 157 def _iter_open_tar(tar_obj, extract_dir, progress_filter):
 158     """Emit member-destination pairs from a tar archive."""
 159     # don't do any chowning!
 160     tar_obj.chown = lambda *args: None
 161
 162     with contextlib.closing(tar_obj):
 163         for member in tar_obj:
 164             name = member.name
 165             # don't extract absolute paths or ones with .. in them
 166             if name.startswith('/') or '..' in name.split('/'):
 167                 continue
 168
 169             prelim_dst = os.path.join(extract_dir, *name.split('/'))
 170
 171             try:
 172                 member = _resolve_tar_file_or_dir(tar_obj, member)
 173             except LookupError:
 174                 continue
 175
 176             final_dst = progress_filter(name, prelim_dst)
 177             if not final_dst:
 178                 continue
 179
 180             if final_dst.endswith(os.sep):
 181                 final_dst = final_dst[:-1]
 182
 183             yield member, final_dst
 184
 185
 186 def unpack_tarfile(filename, extract_dir, progress_filter=default_filter):
 187     """Unpack tar/tar.gz/tar.bz2 `filename` to `extract_dir`
 188
 189     Raises ``UnrecognizedFormat`` if `filename` is not a tarfile (as determined
 190     by ``tarfile.open()``).  See ``unpack_archive()`` for an explanation
 191     of the `progress_filter` argument.
 192     """
 193     try:
 194         tarobj = tarfile.open(filename)
 195     except tarfile.TarError as e:
 196         raise UnrecognizedFormat(
 197             "%s is not a compressed or uncompressed tar file" % (filename,)
 198         ) from e
 199
 200     for member, final_dst in _iter_open_tar(
 201             tarobj, extract_dir, progress_filter,
 202     ):
 203         try:
 204             # XXX Ugh
 205             tarobj._extract_member(member, final_dst)
 206         except tarfile.ExtractError:
 207             # chown/chmod/mkfifo/mknode/makedev failed
 208             pass
 209
 210     return True
 211
 212
 213 extraction_drivers = unpack_directory, unpack_zipfile, unpack_tarfile