Mercurial > treepkg > treepkg
annotate treepkg/util.py @ 461:454967511f5c
commit compress all logs patch from Sascha Teichmann
| author | Bjoern Ricks <bricks@intevation.de> |
|---|---|
| date | Mon, 30 Aug 2010 13:32:31 +0000 |
| parents | 61e72399914c |
| children | 058856954e2d |
| rev | line source |
|---|---|
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1 # Copyright (C) 2007, 2008 by Intevation GmbH |
| 0 | 2 # Authors: |
| 3 # Bernhard Herzog <bh@intevation.de> | |
| 4 # | |
| 5 # This program is free software under the GPL (>=v2) | |
| 6 # Read the file COPYING coming with the software for details. | |
| 7 | |
| 8 """Collection of functions that didn't fit elsewhere""" | |
| 9 | |
| 10 import os | |
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11 import re |
| 0 | 12 import tempfile |
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13 import shutil |
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14 import fnmatch |
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15 import pwd |
| 394 | 16 import os.path |
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17 |
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18 try: |
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19 from hashlib import md5 as new_md5 |
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20 except ImportError: |
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21 # fall back to md5 for Python versions before 2.5 |
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22 from md5 import new as new_md5 |
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23 |
| 0 | 24 import run |
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25 from cmdexpand import cmdexpand |
| 0 | 26 |
| 27 | |
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28 def import_dotted_name(dotted_name): |
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29 module = __import__(dotted_name) |
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30 for name in dotted_name.split(".")[1:]: |
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31 module = getattr(module, name) |
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32 return module |
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33 |
| 0 | 34 def extract_value_for_key(lines, key): |
| 35 """Parses a sequence of strings for a key and returns the associated value | |
| 36 | |
| 37 The function determines the first string in lines that starts with | |
| 38 key. It returns the rest of the lines stripped of leading and | |
| 39 trailing whitespace. | |
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40 |
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41 If the key is not found in lines, the function returns None. |
| 0 | 42 """ |
| 43 for line in lines: | |
| 44 if line.startswith(key): | |
| 45 return line[len(key):].strip() | |
| 46 | |
| 47 def extract_lsm_version(lsm_file): | |
| 48 return extract_value_for_key(open(lsm_file), "Version:") | |
| 49 | |
| 50 def debian_changelog_version(changelog): | |
| 51 """Returns the newest version in a debian changelog.""" | |
| 52 output = run.capture_output(["dpkg-parsechangelog", "-l" + changelog]) | |
| 53 return extract_value_for_key(output.splitlines(), "Version:") | |
| 54 | |
| 55 | |
| 56 def ensure_directory(directory): | |
| 57 """Creates directory and all its parents. | |
| 58 | |
| 59 Unlike os.makedirs, this function doesn't throw an exception | |
| 60 """ | |
| 61 if not os.path.isdir(directory): | |
| 62 os.makedirs(directory) | |
| 63 | |
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64 def listdir_abs(directory, pattern=None): |
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65 """Like os.listdir, but returns a list of absolute pathnames. |
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66 Optionally, a glob pattern can be given to restrict the names |
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67 returned by the function. |
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68 """ |
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69 filenames = os.listdir(directory) |
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70 if pattern is not None: |
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71 filenames = fnmatch.filter(filenames, pattern) |
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72 return [os.path.join(directory, filename) for filename in filenames] |
| 0 | 73 |
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74 def copytree(src, dst, symlinks=False): |
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75 """Recursively copy a directory tree using copy2(). |
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76 |
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77 This version is basically the same as the one in the shutil module |
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78 in the python standard library, however, it's OK if the destination |
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79 directory already exists. |
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80 |
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81 If the optional symlinks flag is true, symbolic links in the |
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82 source tree result in symbolic links in the destination tree; if |
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83 it is false, the contents of the files pointed to by symbolic |
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84 links are copied. |
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85 """ |
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86 names = os.listdir(src) |
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87 ensure_directory(dst) |
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88 errors = [] |
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89 for name in names: |
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90 srcname = os.path.join(src, name) |
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91 dstname = os.path.join(dst, name) |
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92 try: |
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93 if symlinks and os.path.islink(srcname): |
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94 linkto = os.readlink(srcname) |
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95 os.symlink(linkto, dstname) |
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96 elif os.path.isdir(srcname): |
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97 copytree(srcname, dstname, symlinks) |
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98 else: |
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99 shutil.copy2(srcname, dstname) |
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100 # XXX What about devices, sockets etc.? |
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101 except (IOError, os.error), why: |
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102 errors.append((srcname, dstname, why)) |
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103 if errors: |
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104 raise Error, errors |
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105 |
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106 |
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107 |
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108 def writefile(filename, contents, permissions=None): |
| 0 | 109 """Write contents to filename in an atomic way. |
| 110 | |
| 111 The contents are first written to a temporary file in the same | |
| 112 directory as filename. Once the contents are written, the temporary | |
| 113 file is closed and renamed to filename. | |
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114 |
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115 The optional parameter permissions, if given, are the permissions |
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116 for the new file. By default, or if the parameter is None, the |
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117 default permissions set by the tempfile.mkstemp are used which means |
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118 that the file is only readable for the user that created the file. |
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119 The permissions value is used as the second parameter to os.chmod. |
| 0 | 120 """ |
| 121 dirname, basename = os.path.split(filename) | |
| 122 fileno, tempname = tempfile.mkstemp("", basename, dirname) | |
| 123 try: | |
| 124 os.write(fileno, contents) | |
| 125 if not contents.endswith("\n"): | |
| 126 os.write(fileno, "\n") | |
| 127 os.close(fileno) | |
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128 if permissions is not None: |
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129 os.chmod(tempname, permissions) |
| 0 | 130 os.rename(tempname, filename) |
| 131 finally: | |
| 132 if os.path.exists(tempname): | |
| 133 os.remove(tempname) | |
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134 |
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135 |
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136 def replace_in_file(filename, pattern, replacement): |
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137 """Replace all occurrences of pattern in a file with replacement. |
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138 The file is modified in place. The search and replace is done with |
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139 the re.sub function. The pattern and replacement parameter are passed |
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140 through to re.sub unmodified, so their semantics are determined by |
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141 re.sub. |
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142 |
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143 The return value is True if the contents of the file have been |
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144 changed, False otherwise. |
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145 """ |
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146 contents = open(filename).read() |
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147 modified = re.sub(pattern, replacement, contents) |
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148 f = open(filename, "w") |
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149 f.write(modified) |
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150 f.close() |
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151 return modified != contents |
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152 |
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153 |
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154 def filenameproperty(filename, dir_attr="base_dir"): |
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155 """Create a property for a directory or filename. |
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156 If the filename is relative it is interpreted as relative to the |
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157 value of the attribute of self named by dir_attr which defaults to |
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158 'base_dir'. |
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159 """ |
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160 def get(self): |
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161 return os.path.join(getattr(self, dir_attr), filename) |
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162 return property(get) |
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163 |
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164 def getuser(): |
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165 """Returns the login name of the current user owning the proccess""" |
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166 return pwd.getpwuid(os.getuid())[0] |
| 394 | 167 |
| 168 def md5sum(filename): | |
| 169 """ calculates the md5sum of a file """ | |
| 170 if not os.path.isfile(filename): | |
| 171 raise RuntimeError("Could not create md5sum. File not found: %s" | |
| 172 % filename) | |
| 173 f = file(filename, 'rb') | |
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174 m = new_md5() |
| 394 | 175 while True: |
| 176 d = f.read(8096) | |
| 177 if not d: | |
| 178 break | |
| 179 m.update(d) | |
| 180 f.close() | |
| 181 return m.hexdigest() | |
| 182 | |
| 439 | 183 def remove_trailing_slashes(s): |
| 184 return s.rstrip("/") | |
| 185 | |
| 186 def expand_filename(filename): | |
| 187 """ | |
| 188 Applies os.path.expanduser and os.path.expandvars to filename | |
| 189 """ | |
| 190 return os.path.expandvars(os.path.expanduser(filename)) | |
| 191 | |
| 192 | |
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193 def compress_all_logs(reference_log, cmd="gzip -9 $logfile"): |
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194 """ |
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195 Takes the path of a reference log file and compresses all |
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196 files in same folder with the cmd command. |
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197 """ |
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198 if reference_log and os.path.exists(reference_log): |
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199 log_dir = os.path.dirname(reference_log) |
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200 for log_file in [os.path.join(log_dir, f) |
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201 for f in os.listdir(log_dir)]: |
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202 if os.path.isfile(log_file): |
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203 run.call(cmdexpand(cmd, logfile=log_file)) |