Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/setuptools/archive_util.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1
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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(filename, extract_dir, progress_filter=default_filter,
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29 drivers=None):
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30 """Unpack `filename` to `extract_dir`, or raise ``UnrecognizedFormat``
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31
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32 `progress_filter` is a function taking two arguments: a source path
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33 internal to the archive ('/'-separated), and a filesystem path where it
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34 will be extracted. The callback must return the desired extract path
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35 (which may be the same as the one passed in), or else ``None`` to skip
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36 that file or directory. The callback can thus be used to report on the
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37 progress of the extraction, as well as to filter the items extracted or
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38 alter their extraction paths.
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39
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40 `drivers`, if supplied, must be a non-empty sequence of functions with the
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41 same signature as this function (minus the `drivers` argument), that raise
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42 ``UnrecognizedFormat`` if they do not support extracting the designated
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43 archive type. The `drivers` are tried in sequence until one is found that
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44 does not raise an error, or until all are exhausted (in which case
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45 ``UnrecognizedFormat`` is raised). If you do not supply a sequence of
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46 drivers, the module's ``extraction_drivers`` constant will be used, which
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47 means that ``unpack_zipfile`` and ``unpack_tarfile`` will be tried, in that
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48 order.
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49 """
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50 for driver in drivers or extraction_drivers:
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51 try:
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52 driver(filename, extract_dir, progress_filter)
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53 except UnrecognizedFormat:
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54 continue
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55 else:
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56 return
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57 else:
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58 raise UnrecognizedFormat(
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59 "Not a recognized archive type: %s" % filename
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60 )
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61
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62
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63 def unpack_directory(filename, extract_dir, progress_filter=default_filter):
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64 """"Unpack" a directory, using the same interface as for archives
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65
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66 Raises ``UnrecognizedFormat`` if `filename` is not a directory
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67 """
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68 if not os.path.isdir(filename):
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69 raise UnrecognizedFormat("%s is not a directory" % filename)
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70
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71 paths = {
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72 filename: ('', extract_dir),
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73 }
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74 for base, dirs, files in os.walk(filename):
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75 src, dst = paths[base]
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76 for d in dirs:
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77 paths[os.path.join(base, d)] = src + d + '/', os.path.join(dst, d)
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78 for f in files:
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79 target = os.path.join(dst, f)
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80 target = progress_filter(src + f, target)
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81 if not target:
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82 # skip non-files
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83 continue
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84 ensure_directory(target)
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85 f = os.path.join(base, f)
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86 shutil.copyfile(f, target)
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87 shutil.copystat(f, target)
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88
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89
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90 def unpack_zipfile(filename, extract_dir, progress_filter=default_filter):
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91 """Unpack zip `filename` to `extract_dir`
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92
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93 Raises ``UnrecognizedFormat`` if `filename` is not a zipfile (as determined
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94 by ``zipfile.is_zipfile()``). See ``unpack_archive()`` for an explanation
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95 of the `progress_filter` argument.
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96 """
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97
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98 if not zipfile.is_zipfile(filename):
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99 raise UnrecognizedFormat("%s is not a zip file" % (filename,))
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100
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101 with zipfile.ZipFile(filename) as z:
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102 for info in z.infolist():
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103 name = info.filename
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104
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105 # don't extract absolute paths or ones with .. in them
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106 if name.startswith('/') or '..' in name.split('/'):
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107 continue
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108
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109 target = os.path.join(extract_dir, *name.split('/'))
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110 target = progress_filter(name, target)
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111 if not target:
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112 continue
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113 if name.endswith('/'):
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114 # directory
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115 ensure_directory(target)
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116 else:
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117 # file
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118 ensure_directory(target)
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119 data = z.read(info.filename)
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120 with open(target, 'wb') as f:
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121 f.write(data)
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122 unix_attributes = info.external_attr >> 16
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123 if unix_attributes:
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124 os.chmod(target, unix_attributes)
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125
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126
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127 def unpack_tarfile(filename, extract_dir, progress_filter=default_filter):
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128 """Unpack tar/tar.gz/tar.bz2 `filename` to `extract_dir`
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129
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130 Raises ``UnrecognizedFormat`` if `filename` is not a tarfile (as determined
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131 by ``tarfile.open()``). See ``unpack_archive()`` for an explanation
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132 of the `progress_filter` argument.
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133 """
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134 try:
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135 tarobj = tarfile.open(filename)
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136 except tarfile.TarError:
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137 raise UnrecognizedFormat(
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138 "%s is not a compressed or uncompressed tar file" % (filename,)
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139 )
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140 with contextlib.closing(tarobj):
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141 # don't do any chowning!
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142 tarobj.chown = lambda *args: None
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143 for member in tarobj:
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144 name = member.name
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145 # don't extract absolute paths or ones with .. in them
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146 if not name.startswith('/') and '..' not in name.split('/'):
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147 prelim_dst = os.path.join(extract_dir, *name.split('/'))
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148
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149 # resolve any links and to extract the link targets as normal
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150 # files
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151 while member is not None and (member.islnk() or member.issym()):
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152 linkpath = member.linkname
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153 if member.issym():
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154 base = posixpath.dirname(member.name)
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155 linkpath = posixpath.join(base, linkpath)
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156 linkpath = posixpath.normpath(linkpath)
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157 member = tarobj._getmember(linkpath)
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158
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159 if member is not None and (member.isfile() or member.isdir()):
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160 final_dst = progress_filter(name, prelim_dst)
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161 if final_dst:
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162 if final_dst.endswith(os.sep):
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163 final_dst = final_dst[:-1]
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164 try:
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165 # XXX Ugh
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166 tarobj._extract_member(member, final_dst)
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167 except tarfile.ExtractError:
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168 # chown/chmod/mkfifo/mknode/makedev failed
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169 pass
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170 return True
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171
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172
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173 extraction_drivers = unpack_directory, unpack_zipfile, unpack_tarfile