Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/setuptools/_distutils/file_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 """distutils.file_util |
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2 |
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3 Utility functions for operating on single files. |
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4 """ |
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5 |
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6 import os |
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7 from distutils.errors import DistutilsFileError |
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8 from distutils import log |
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9 |
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10 # for generating verbose output in 'copy_file()' |
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11 _copy_action = { None: 'copying', |
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12 'hard': 'hard linking', |
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13 'sym': 'symbolically linking' } |
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14 |
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15 |
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16 def _copy_file_contents(src, dst, buffer_size=16*1024): |
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17 """Copy the file 'src' to 'dst'; both must be filenames. Any error |
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18 opening either file, reading from 'src', or writing to 'dst', raises |
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19 DistutilsFileError. Data is read/written in chunks of 'buffer_size' |
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20 bytes (default 16k). No attempt is made to handle anything apart from |
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21 regular files. |
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22 """ |
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23 # Stolen from shutil module in the standard library, but with |
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24 # custom error-handling added. |
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25 fsrc = None |
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26 fdst = None |
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27 try: |
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28 try: |
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29 fsrc = open(src, 'rb') |
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30 except OSError as e: |
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31 raise DistutilsFileError("could not open '%s': %s" % (src, e.strerror)) |
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32 |
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33 if os.path.exists(dst): |
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34 try: |
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35 os.unlink(dst) |
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36 except OSError as e: |
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37 raise DistutilsFileError( |
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38 "could not delete '%s': %s" % (dst, e.strerror)) |
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39 |
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40 try: |
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41 fdst = open(dst, 'wb') |
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42 except OSError as e: |
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43 raise DistutilsFileError( |
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44 "could not create '%s': %s" % (dst, e.strerror)) |
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45 |
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46 while True: |
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47 try: |
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48 buf = fsrc.read(buffer_size) |
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49 except OSError as e: |
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50 raise DistutilsFileError( |
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51 "could not read from '%s': %s" % (src, e.strerror)) |
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52 |
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53 if not buf: |
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54 break |
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55 |
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56 try: |
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57 fdst.write(buf) |
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58 except OSError as e: |
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59 raise DistutilsFileError( |
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60 "could not write to '%s': %s" % (dst, e.strerror)) |
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61 finally: |
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62 if fdst: |
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63 fdst.close() |
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64 if fsrc: |
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65 fsrc.close() |
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66 |
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67 def copy_file(src, dst, preserve_mode=1, preserve_times=1, update=0, |
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68 link=None, verbose=1, dry_run=0): |
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69 """Copy a file 'src' to 'dst'. If 'dst' is a directory, then 'src' is |
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70 copied there with the same name; otherwise, it must be a filename. (If |
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71 the file exists, it will be ruthlessly clobbered.) If 'preserve_mode' |
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72 is true (the default), the file's mode (type and permission bits, or |
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73 whatever is analogous on the current platform) is copied. If |
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74 'preserve_times' is true (the default), the last-modified and |
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75 last-access times are copied as well. If 'update' is true, 'src' will |
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76 only be copied if 'dst' does not exist, or if 'dst' does exist but is |
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77 older than 'src'. |
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78 |
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79 'link' allows you to make hard links (os.link) or symbolic links |
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80 (os.symlink) instead of copying: set it to "hard" or "sym"; if it is |
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81 None (the default), files are copied. Don't set 'link' on systems that |
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82 don't support it: 'copy_file()' doesn't check if hard or symbolic |
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83 linking is available. If hardlink fails, falls back to |
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84 _copy_file_contents(). |
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85 |
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86 Under Mac OS, uses the native file copy function in macostools; on |
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87 other systems, uses '_copy_file_contents()' to copy file contents. |
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88 |
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89 Return a tuple (dest_name, copied): 'dest_name' is the actual name of |
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90 the output file, and 'copied' is true if the file was copied (or would |
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91 have been copied, if 'dry_run' true). |
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92 """ |
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93 # XXX if the destination file already exists, we clobber it if |
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94 # copying, but blow up if linking. Hmmm. And I don't know what |
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95 # macostools.copyfile() does. Should definitely be consistent, and |
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96 # should probably blow up if destination exists and we would be |
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97 # changing it (ie. it's not already a hard/soft link to src OR |
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98 # (not update) and (src newer than dst). |
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99 |
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100 from distutils.dep_util import newer |
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101 from stat import ST_ATIME, ST_MTIME, ST_MODE, S_IMODE |
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102 |
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103 if not os.path.isfile(src): |
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104 raise DistutilsFileError( |
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105 "can't copy '%s': doesn't exist or not a regular file" % src) |
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106 |
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107 if os.path.isdir(dst): |
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108 dir = dst |
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109 dst = os.path.join(dst, os.path.basename(src)) |
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110 else: |
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111 dir = os.path.dirname(dst) |
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112 |
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113 if update and not newer(src, dst): |
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114 if verbose >= 1: |
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115 log.debug("not copying %s (output up-to-date)", src) |
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116 return (dst, 0) |
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117 |
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118 try: |
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119 action = _copy_action[link] |
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120 except KeyError: |
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121 raise ValueError("invalid value '%s' for 'link' argument" % link) |
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122 |
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123 if verbose >= 1: |
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124 if os.path.basename(dst) == os.path.basename(src): |
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125 log.info("%s %s -> %s", action, src, dir) |
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126 else: |
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127 log.info("%s %s -> %s", action, src, dst) |
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128 |
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129 if dry_run: |
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130 return (dst, 1) |
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131 |
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132 # If linking (hard or symbolic), use the appropriate system call |
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133 # (Unix only, of course, but that's the caller's responsibility) |
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134 elif link == 'hard': |
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135 if not (os.path.exists(dst) and os.path.samefile(src, dst)): |
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136 try: |
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137 os.link(src, dst) |
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138 return (dst, 1) |
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139 except OSError: |
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140 # If hard linking fails, fall back on copying file |
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141 # (some special filesystems don't support hard linking |
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142 # even under Unix, see issue #8876). |
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143 pass |
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144 elif link == 'sym': |
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145 if not (os.path.exists(dst) and os.path.samefile(src, dst)): |
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146 os.symlink(src, dst) |
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147 return (dst, 1) |
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148 |
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149 # Otherwise (non-Mac, not linking), copy the file contents and |
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150 # (optionally) copy the times and mode. |
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151 _copy_file_contents(src, dst) |
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152 if preserve_mode or preserve_times: |
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153 st = os.stat(src) |
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154 |
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155 # According to David Ascher <da@ski.org>, utime() should be done |
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156 # before chmod() (at least under NT). |
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157 if preserve_times: |
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158 os.utime(dst, (st[ST_ATIME], st[ST_MTIME])) |
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159 if preserve_mode: |
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160 os.chmod(dst, S_IMODE(st[ST_MODE])) |
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161 |
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162 return (dst, 1) |
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163 |
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164 |
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165 # XXX I suspect this is Unix-specific -- need porting help! |
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166 def move_file (src, dst, |
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167 verbose=1, |
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168 dry_run=0): |
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169 |
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170 """Move a file 'src' to 'dst'. If 'dst' is a directory, the file will |
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171 be moved into it with the same name; otherwise, 'src' is just renamed |
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172 to 'dst'. Return the new full name of the file. |
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173 |
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174 Handles cross-device moves on Unix using 'copy_file()'. What about |
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175 other systems??? |
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176 """ |
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177 from os.path import exists, isfile, isdir, basename, dirname |
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178 import errno |
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179 |
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180 if verbose >= 1: |
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181 log.info("moving %s -> %s", src, dst) |
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182 |
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183 if dry_run: |
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184 return dst |
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185 |
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186 if not isfile(src): |
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187 raise DistutilsFileError("can't move '%s': not a regular file" % src) |
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188 |
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189 if isdir(dst): |
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190 dst = os.path.join(dst, basename(src)) |
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191 elif exists(dst): |
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192 raise DistutilsFileError( |
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193 "can't move '%s': destination '%s' already exists" % |
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194 (src, dst)) |
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195 |
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196 if not isdir(dirname(dst)): |
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197 raise DistutilsFileError( |
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198 "can't move '%s': destination '%s' not a valid path" % |
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199 (src, dst)) |
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200 |
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201 copy_it = False |
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202 try: |
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203 os.rename(src, dst) |
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204 except OSError as e: |
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205 (num, msg) = e.args |
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206 if num == errno.EXDEV: |
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207 copy_it = True |
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208 else: |
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209 raise DistutilsFileError( |
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210 "couldn't move '%s' to '%s': %s" % (src, dst, msg)) |
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211 |
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212 if copy_it: |
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213 copy_file(src, dst, verbose=verbose) |
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214 try: |
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215 os.unlink(src) |
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216 except OSError as e: |
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217 (num, msg) = e.args |
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218 try: |
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219 os.unlink(dst) |
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220 except OSError: |
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221 pass |
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222 raise DistutilsFileError( |
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223 "couldn't move '%s' to '%s' by copy/delete: " |
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224 "delete '%s' failed: %s" |
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225 % (src, dst, src, msg)) |
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226 return dst |
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227 |
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228 |
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229 def write_file (filename, contents): |
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230 """Create a file with the specified name and write 'contents' (a |
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231 sequence of strings without line terminators) to it. |
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232 """ |
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233 f = open(filename, "w") |
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234 try: |
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235 for line in contents: |
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236 f.write(line + "\n") |
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237 finally: |
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238 f.close() |