Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/setuptools/archive_util.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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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 _resolve_tar_file_or_dir(tar_obj, tar_member_obj): |
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129 """Resolve any links and extract link targets as normal files.""" |
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130 while tar_member_obj is not None and ( |
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131 tar_member_obj.islnk() or tar_member_obj.issym()): |
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132 linkpath = tar_member_obj.linkname |
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133 if tar_member_obj.issym(): |
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134 base = posixpath.dirname(tar_member_obj.name) |
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135 linkpath = posixpath.join(base, linkpath) |
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136 linkpath = posixpath.normpath(linkpath) |
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137 tar_member_obj = tar_obj._getmember(linkpath) |
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138 |
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139 is_file_or_dir = ( |
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140 tar_member_obj is not None and |
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141 (tar_member_obj.isfile() or tar_member_obj.isdir()) |
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142 ) |
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143 if is_file_or_dir: |
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144 return tar_member_obj |
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145 |
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146 raise LookupError('Got unknown file type') |
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147 |
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148 |
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149 def _iter_open_tar(tar_obj, extract_dir, progress_filter): |
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150 """Emit member-destination pairs from a tar archive.""" |
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151 # don't do any chowning! |
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152 tar_obj.chown = lambda *args: None |
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153 |
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154 with contextlib.closing(tar_obj): |
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155 for member in tar_obj: |
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156 name = member.name |
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157 # don't extract absolute paths or ones with .. in them |
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158 if name.startswith('/') or '..' in name.split('/'): |
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159 continue |
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160 |
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161 prelim_dst = os.path.join(extract_dir, *name.split('/')) |
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162 |
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163 try: |
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164 member = _resolve_tar_file_or_dir(tar_obj, member) |
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165 except LookupError: |
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166 continue |
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167 |
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168 final_dst = progress_filter(name, prelim_dst) |
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169 if not final_dst: |
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170 continue |
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171 |
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172 if final_dst.endswith(os.sep): |
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173 final_dst = final_dst[:-1] |
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174 |
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175 yield member, final_dst |
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176 |
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177 |
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178 def unpack_tarfile(filename, extract_dir, progress_filter=default_filter): |
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179 """Unpack tar/tar.gz/tar.bz2 `filename` to `extract_dir` |
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180 |
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181 Raises ``UnrecognizedFormat`` if `filename` is not a tarfile (as determined |
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182 by ``tarfile.open()``). See ``unpack_archive()`` for an explanation |
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183 of the `progress_filter` argument. |
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184 """ |
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185 try: |
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186 tarobj = tarfile.open(filename) |
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187 except tarfile.TarError as e: |
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188 raise UnrecognizedFormat( |
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189 "%s is not a compressed or uncompressed tar file" % (filename,) |
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190 ) from e |
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191 |
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192 for member, final_dst in _iter_open_tar( |
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193 tarobj, extract_dir, progress_filter, |
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194 ): |
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195 try: |
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196 # XXX Ugh |
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197 tarobj._extract_member(member, final_dst) |
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198 except tarfile.ExtractError: |
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199 # chown/chmod/mkfifo/mknode/makedev failed |
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200 pass |
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201 |
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202 return True |
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203 |
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204 |
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205 extraction_drivers = unpack_directory, unpack_zipfile, unpack_tarfile |