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annotate lib/python3.8/site-packages/setuptools/archive_util.py @ 0:9e54283cc701 draft

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"planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
author guerler
date Mon, 27 Jul 2020 03:47:31 -0400
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1 """Utilities for extracting common archive formats"""
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2
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3 import zipfile
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4 import tarfile
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5 import os
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6 import shutil
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7 import posixpath
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8 import contextlib
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9 from distutils.errors import DistutilsError
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10
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11 from pkg_resources import ensure_directory
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12
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13 __all__ = [
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14 "unpack_archive", "unpack_zipfile", "unpack_tarfile", "default_filter",
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15 "UnrecognizedFormat", "extraction_drivers", "unpack_directory",
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16 ]
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17
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18
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19 class UnrecognizedFormat(DistutilsError):
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20 """Couldn't recognize the archive type"""
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21
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22
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23 def default_filter(src, dst):
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24 """The default progress/filter callback; returns True for all files"""
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25 return dst
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26
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27
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28 def unpack_archive(
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29 filename, extract_dir, progress_filter=default_filter,
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30 drivers=None):
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31 """Unpack `filename` to `extract_dir`, or raise ``UnrecognizedFormat``
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32
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33 `progress_filter` is a function taking two arguments: a source path
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34 internal to the archive ('/'-separated), and a filesystem path where it
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35 will be extracted. The callback must return the desired extract path
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36 (which may be the same as the one passed in), or else ``None`` to skip
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37 that file or directory. The callback can thus be used to report on the
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38 progress of the extraction, as well as to filter the items extracted or
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39 alter their extraction paths.
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40
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41 `drivers`, if supplied, must be a non-empty sequence of functions with the
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42 same signature as this function (minus the `drivers` argument), that raise
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43 ``UnrecognizedFormat`` if they do not support extracting the designated
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44 archive type. The `drivers` are tried in sequence until one is found that
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45 does not raise an error, or until all are exhausted (in which case
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46 ``UnrecognizedFormat`` is raised). If you do not supply a sequence of
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47 drivers, the module's ``extraction_drivers`` constant will be used, which
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48 means that ``unpack_zipfile`` and ``unpack_tarfile`` will be tried, in that
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49 order.
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50 """
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51 for driver in drivers or extraction_drivers:
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52 try:
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53 driver(filename, extract_dir, progress_filter)
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54 except UnrecognizedFormat:
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55 continue
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56 else:
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57 return
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58 else:
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59 raise UnrecognizedFormat(
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60 "Not a recognized archive type: %s" % filename
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61 )
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62
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63
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64 def unpack_directory(filename, extract_dir, progress_filter=default_filter):
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65 """"Unpack" a directory, using the same interface as for archives
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66
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67 Raises ``UnrecognizedFormat`` if `filename` is not a directory
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68 """
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69 if not os.path.isdir(filename):
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70 raise UnrecognizedFormat("%s is not a directory" % filename)
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71
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72 paths = {
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73 filename: ('', extract_dir),
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74 }
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75 for base, dirs, files in os.walk(filename):
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76 src, dst = paths[base]
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77 for d in dirs:
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78 paths[os.path.join(base, d)] = src + d + '/', os.path.join(dst, d)
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79 for f in files:
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80 target = os.path.join(dst, f)
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81 target = progress_filter(src + f, target)
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82 if not target:
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83 # skip non-files
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84 continue
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85 ensure_directory(target)
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86 f = os.path.join(base, f)
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87 shutil.copyfile(f, target)
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88 shutil.copystat(f, target)
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89
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90
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91 def unpack_zipfile(filename, extract_dir, progress_filter=default_filter):
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92 """Unpack zip `filename` to `extract_dir`
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93
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94 Raises ``UnrecognizedFormat`` if `filename` is not a zipfile (as determined
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95 by ``zipfile.is_zipfile()``). See ``unpack_archive()`` for an explanation
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96 of the `progress_filter` argument.
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97 """
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98
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99 if not zipfile.is_zipfile(filename):
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100 raise UnrecognizedFormat("%s is not a zip file" % (filename,))
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101
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102 with zipfile.ZipFile(filename) as z:
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103 for info in z.infolist():
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104 name = info.filename
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105
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106 # don't extract absolute paths or ones with .. in them
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107 if name.startswith('/') or '..' in name.split('/'):
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108 continue
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109
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110 target = os.path.join(extract_dir, *name.split('/'))
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111 target = progress_filter(name, target)
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112 if not target:
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113 continue
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114 if name.endswith('/'):
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115 # directory
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116 ensure_directory(target)
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117 else:
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118 # file
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119 ensure_directory(target)
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120 data = z.read(info.filename)
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121 with open(target, 'wb') as f:
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122 f.write(data)
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123 unix_attributes = info.external_attr >> 16
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124 if unix_attributes:
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125 os.chmod(target, unix_attributes)
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126
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127
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128 def unpack_tarfile(filename, extract_dir, progress_filter=default_filter):
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129 """Unpack tar/tar.gz/tar.bz2 `filename` to `extract_dir`
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130
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131 Raises ``UnrecognizedFormat`` if `filename` is not a tarfile (as determined
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132 by ``tarfile.open()``). See ``unpack_archive()`` for an explanation
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133 of the `progress_filter` argument.
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134 """
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135 try:
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136 tarobj = tarfile.open(filename)
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137 except tarfile.TarError:
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138 raise UnrecognizedFormat(
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139 "%s is not a compressed or uncompressed tar file" % (filename,)
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140 )
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141 with contextlib.closing(tarobj):
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142 # don't do any chowning!
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143 tarobj.chown = lambda *args: None
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144 for member in tarobj:
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145 name = member.name
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146 # don't extract absolute paths or ones with .. in them
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147 if not name.startswith('/') and '..' not in name.split('/'):
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148 prelim_dst = os.path.join(extract_dir, *name.split('/'))
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149
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150 # resolve any links and to extract the link targets as normal
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151 # files
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152 while member is not None and (
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153 member.islnk() or member.issym()):
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154 linkpath = member.linkname
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155 if member.issym():
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156 base = posixpath.dirname(member.name)
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157 linkpath = posixpath.join(base, linkpath)
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158 linkpath = posixpath.normpath(linkpath)
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159 member = tarobj._getmember(linkpath)
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160
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161 if member is not None and (member.isfile() or member.isdir()):
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162 final_dst = progress_filter(name, prelim_dst)
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163 if final_dst:
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164 if final_dst.endswith(os.sep):
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165 final_dst = final_dst[:-1]
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166 try:
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167 # XXX Ugh
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168 tarobj._extract_member(member, final_dst)
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169 except tarfile.ExtractError:
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170 # chown/chmod/mkfifo/mknode/makedev failed
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171 pass
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172 return True
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173
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174
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175 extraction_drivers = unpack_directory, unpack_zipfile, unpack_tarfile