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annotate sat/tools/utils.py @ 3606:25d3677701e7

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doc: developer documentation explaining storage and pubsub cache
author Goffi <goffi@goffi.org>
date Thu, 29 Jul 2021 22:51:01 +0200
parents aa58451b77ba
children 0a87cae85746
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1 #!/usr/bin/env python3
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2
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3 # SaT: an XMPP client
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4 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)
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5
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6 # This program is free software: you can redistribute it and/or modify
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7 # it under the terms of the GNU Affero General Public License as published by
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8 # the Free Software Foundation, either version 3 of the License, or
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9 # (at your option) any later version.
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10
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11 # This program is distributed in the hope that it will be useful,
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12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 # GNU Affero General Public License for more details.
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15
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16 # You should have received a copy of the GNU Affero General Public License
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17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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18
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19 """ various useful methods """
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20
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21 import unicodedata
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22 import os.path
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23 import datetime
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24 import subprocess
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25 import time
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26 import sys
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27 import random
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28 import inspect
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29 import textwrap
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30 import functools
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31 import asyncio
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32 from twisted.python import procutils, failure
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33 from twisted.internet import defer
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34 from sat.core.constants import Const as C
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35 from sat.core.log import getLogger
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36
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37 log = getLogger(__name__)
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38
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39
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40 NO_REPOS_DATA = "repository data unknown"
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41 repos_cache_dict = None
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42 repos_cache = None
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44
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45 def clean_ustr(ustr):
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46 """Clean unicode string
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47
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48 remove special characters from unicode string
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49 """
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50
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51 def valid_chars(unicode_source):
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52 for char in unicode_source:
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53 if unicodedata.category(char) == "Cc" and char != "\n":
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54 continue
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55 yield char
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56
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57 return "".join(valid_chars(ustr))
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58
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60 def logError(failure_):
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61 """Genertic errback which log the error as a warning, and re-raise it"""
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62 log.warning(failure_.value)
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63 raise failure_
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66 def partial(func, *fixed_args, **fixed_kwargs):
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67 # FIXME: temporary hack to workaround the fact that inspect.getargspec is not working with functools.partial
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68 # making partial unusable with current D-bus module (in addMethod).
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69 # Should not be needed anywore once moved to Python 3
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71 ori_args = inspect.getargspec(func).args
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72 func = functools.partial(func, *fixed_args, **fixed_kwargs)
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73 if ori_args[0] == "self":
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74 del ori_args[0]
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75 ori_args = ori_args[len(fixed_args) :]
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76 for kw in fixed_kwargs:
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77 ori_args.remove(kw)
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78
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79 exec(
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80 textwrap.dedent(
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81 """\
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82 def method({args}):
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83 return func({kw_args})
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84 """
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85 ).format(
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86 args=", ".join(ori_args), kw_args=", ".join([a + "=" + a for a in ori_args])
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87 ),
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88 locals(),
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89 )
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90
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91 return method
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92
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93
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94 def asDeferred(func, *args, **kwargs):
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95 """Call a method and return a Deferred
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96
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97 the method can be a simple callable, a Deferred or a coroutine.
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98 It is similar to defer.maybeDeferred, but also handles coroutines
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99 """
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100 try:
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101 ret = func(*args, **kwargs)
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102 except Exception as e:
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103 return defer.fail(failure.Failure(e))
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104 else:
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105 if asyncio.iscoroutine(ret):
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106 return defer.ensureDeferred(ret)
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107 elif isinstance(ret, defer.Deferred):
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108 return ret
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109 elif isinstance(ret, failure.Failure):
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110 return defer.fail(ret)
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111 else:
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112 return defer.succeed(ret)
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113
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114
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115 def aio(func):
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116 """Decorator to return a Deferred from asyncio coroutine
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117
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118 Functions with this decorator are run in asyncio context
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119 """
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120 def wrapper(*args, **kwargs):
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121 return defer.Deferred.fromFuture(asyncio.ensure_future(func(*args, **kwargs)))
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122 return wrapper
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123
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124
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125 def as_future(d):
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126 return d.asFuture(asyncio.get_event_loop())
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127
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128
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129 def ensure_deferred(func):
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130 """Decorator to apply ensureDeferred to a function
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131
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132 to be used when the function is called by third party library (e.g. wokkel)
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133 Otherwise, it's better to use ensureDeferred as early as possible.
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134 """
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135 def wrapper(*args, **kwargs):
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136 return defer.ensureDeferred(func(*args, **kwargs))
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137 return wrapper
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138
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139
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140 def xmpp_date(timestamp=None, with_time=True):
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141 """Return date according to XEP-0082 specification
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142
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143 to avoid reveling the timezone, we always return UTC dates
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144 the string returned by this method is valid with RFC 3339
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145 @param timestamp(None, float): posix timestamp. If None current time will be used
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146 @param with_time(bool): if True include the time
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147 @return(unicode): XEP-0082 formatted date and time
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148 """
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149 template_date = "%Y-%m-%d"
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150 template_time = "%H:%M:%SZ"
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151 template = (
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152 "{}T{}".format(template_date, template_time) if with_time else template_date
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153 )
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154 return datetime.datetime.utcfromtimestamp(
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155 time.time() if timestamp is None else timestamp
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156 ).strftime(template)
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157
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158
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159 def generatePassword(vocabulary=None, size=20):
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160 """Generate a password with random characters.
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161
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162 @param vocabulary(iterable): characters to use to create password
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163 @param size(int): number of characters in the password to generate
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164 @return (unicode): generated password
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165 """
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166 random.seed()
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167 if vocabulary is None:
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168 vocabulary = [
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169 chr(i) for i in list(range(0x30, 0x3A)) + list(range(0x41, 0x5B)) + list(range(0x61, 0x7B))
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170 ]
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171 return "".join([random.choice(vocabulary) for i in range(15)])
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172
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173
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174 def getRepositoryData(module, as_string=True, is_path=False):
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175 """Retrieve info on current mecurial repository
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176
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177 Data is gotten by using the following methods, in order:
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178 - using "hg" executable
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179 - looking for a .hg/dirstate in parent directory of module (or in module/.hg if
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180 is_path is True), and parse dirstate file to get revision
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181 - checking package version, which should have repository data when we are on a dev version
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182 @param module(unicode): module to look for (e.g. sat, libervia)
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183 module can be a path if is_path is True (see below)
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184 @param as_string(bool): if True return a string, else return a dictionary
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185 @param is_path(bool): if True "module" is not handled as a module name, but as an
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186 absolute path to the parent of a ".hg" directory
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187 @return (unicode, dictionary): retrieved info in a nice string,
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188 or a dictionary with retrieved data (key is not present if data is not found),
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189 key can be:
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190 - node: full revision number (40 bits)
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191 - branch: branch name
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192 - date: ISO 8601 format date
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193 - tag: latest tag used in hierarchie
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194 - distance: number of commits since the last tag
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195 """
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196 global repos_cache_dict
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197 if as_string:
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198 global repos_cache
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199 if repos_cache is not None:
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200 return repos_cache
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201 else:
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202 if repos_cache_dict is not None:
18e2ca5f798e tools (utils): better repository version handling:
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203 return repos_cache_dict
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204
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205 if sys.platform == "android":
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206 #  FIXME: workaround to avoid trouble on android, need to be fixed properly
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207 repos_cache = "Cagou android build"
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208 return repos_cache
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209
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210 KEYS = ("node", "node_short", "branch", "date", "tag", "distance")
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211 ori_cwd = os.getcwd()
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212
06e13ae616cf tools (utils): improved repository version detection:
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213 if is_path:
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214 repos_root = os.path.abspath(module)
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215 else:
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216 repos_root = os.path.abspath(os.path.dirname(module.__file__))
1858
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217
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218 try:
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219 hg_path = procutils.which("hg")[0]
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220 except IndexError:
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221 log.warning("Can't find hg executable")
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222 hg_path = None
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223 hg_data = {}
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224
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225 if hg_path is not None:
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226 os.chdir(repos_root)
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227 try:
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228 hg_data_raw = subprocess.check_output(
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229 [
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230 "hg",
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231 "log",
56f94936df1e code style reformatting using black
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232 "-r",
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233 "-1",
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234 "--template",
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235 "{node}\n"
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236 "{node|short}\n"
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237 "{branch}\n"
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238 "{date|isodate}\n"
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239 "{latesttag}\n"
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240 "{latesttagdistance}",
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241 ],
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242 text=True
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243 )
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244 except subprocess.CalledProcessError:
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245 hg_data = {}
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246 else:
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247 hg_data = dict(list(zip(KEYS, hg_data_raw.split("\n"))))
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248 try:
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249 hg_data["modified"] = "+" in subprocess.check_output(["hg", "id", "-i"], text=True)
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250 except subprocess.CalledProcessError:
2d2617930f97 core (tools): fixed bad call to "hg id" when hg is not working to guest revision, which was the cause of an Exception
Goffi <goffi@goffi.org>
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diff changeset
251 pass
1471
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252 else:
934e402c90bf core: tools.utils.getRepositoryData now return "hg log -r -1" and short form of node + fixed crash if mercurial is not present:
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253 hg_data = {}
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254
3a20312d4012 core: if we are in dev version and it's possible, repository data are now checked and added to SàT version
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255 if not hg_data:
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256 # .hg/dirstate method
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257 log.debug("trying dirstate method")
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258 if is_path:
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259 os.chdir(repos_root)
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260 else:
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261 os.chdir(os.path.abspath(os.path.dirname(repos_root)))
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262 try:
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263 with open(".hg/dirstate", 'rb') as hg_dirstate:
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264 hg_data["node"] = hg_dirstate.read(20).hex()
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265 hg_data["node_short"] = hg_data["node"][:12]
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266 except IOError:
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267 log.debug("Can't access repository data")
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268
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269 # we restore original working dir
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270 os.chdir(ori_cwd)
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271
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272 if not hg_data:
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273 log.debug("Mercurial not available or working, trying package version")
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274 try:
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275 import pkg_resources
18e2ca5f798e tools (utils): better repository version handling:
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276 except ImportError:
18e2ca5f798e tools (utils): better repository version handling:
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277 log.warning("pkg_resources not available, can't get package data")
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278 else:
3420
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diff changeset
279 try:
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280 pkg_version = pkg_resources.get_distribution(C.APP_NAME_FILE).version
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281 version, local_id = pkg_version.split("+", 1)
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282 except pkg_resources.DistributionNotFound:
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283 log.warning("can't retrieve package data")
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diff changeset
284 except ValueError:
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285 log.info(
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286 "no local version id in package: {pkg_version}".format(
b526b95f11f2 tools(utils): fixed error catching when getting repository data with `pkg_resources`
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287 pkg_version=pkg_version
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288 )
56f94936df1e code style reformatting using black
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parents: 2612
diff changeset
289 )
1858
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290 else:
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291 version = version.replace(".dev0", "D")
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292 if version != C.APP_VERSION:
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diff changeset
293 log.warning(
b526b95f11f2 tools(utils): fixed error catching when getting repository data with `pkg_resources`
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294 "Incompatible version ({version}) and pkg_version ({pkg_version})"
b526b95f11f2 tools(utils): fixed error catching when getting repository data with `pkg_resources`
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diff changeset
295 .format(
b526b95f11f2 tools(utils): fixed error catching when getting repository data with `pkg_resources`
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diff changeset
296 version=C.APP_VERSION, pkg_version=pkg_version
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Goffi <goffi@goffi.org>
parents: 3368
diff changeset
297 )
b526b95f11f2 tools(utils): fixed error catching when getting repository data with `pkg_resources`
Goffi <goffi@goffi.org>
parents: 3368
diff changeset
298 )
b526b95f11f2 tools(utils): fixed error catching when getting repository data with `pkg_resources`
Goffi <goffi@goffi.org>
parents: 3368
diff changeset
299 else:
b526b95f11f2 tools(utils): fixed error catching when getting repository data with `pkg_resources`
Goffi <goffi@goffi.org>
parents: 3368
diff changeset
300 try:
b526b95f11f2 tools(utils): fixed error catching when getting repository data with `pkg_resources`
Goffi <goffi@goffi.org>
parents: 3368
diff changeset
301 hg_node, hg_distance = local_id.split(".")
b526b95f11f2 tools(utils): fixed error catching when getting repository data with `pkg_resources`
Goffi <goffi@goffi.org>
parents: 3368
diff changeset
302 except ValueError:
b526b95f11f2 tools(utils): fixed error catching when getting repository data with `pkg_resources`
Goffi <goffi@goffi.org>
parents: 3368
diff changeset
303 log.warning("Version doesn't specify repository data")
b526b95f11f2 tools(utils): fixed error catching when getting repository data with `pkg_resources`
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parents: 3368
diff changeset
304 hg_data = {"node_short": hg_node, "distance": hg_distance}
2573
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diff changeset
305
18e2ca5f798e tools (utils): better repository version handling:
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diff changeset
306 repos_cache_dict = hg_data
1858
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diff changeset
307
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diff changeset
308 if as_string:
3a20312d4012 core: if we are in dev version and it's possible, repository data are now checked and added to SàT version
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diff changeset
309 if not hg_data:
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310 repos_cache = NO_REPOS_DATA
18e2ca5f798e tools (utils): better repository version handling:
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diff changeset
311 else:
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diff changeset
312 strings = ["rev", hg_data["node_short"]]
2573
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diff changeset
313 try:
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parents: 2612
diff changeset
314 if hg_data["modified"]:
3028
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diff changeset
315 strings.append("[M]")
2573
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diff changeset
316 except KeyError:
18e2ca5f798e tools (utils): better repository version handling:
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parents: 2568
diff changeset
317 pass
18e2ca5f798e tools (utils): better repository version handling:
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parents: 2568
diff changeset
318 try:
3028
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diff changeset
319 strings.extend(["({branch} {date})".format(**hg_data)])
2573
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diff changeset
320 except KeyError:
18e2ca5f798e tools (utils): better repository version handling:
Goffi <goffi@goffi.org>
parents: 2568
diff changeset
321 pass
18e2ca5f798e tools (utils): better repository version handling:
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parents: 2568
diff changeset
322 try:
3028
ab2696e34d29 Python 3 port:
Goffi <goffi@goffi.org>
parents: 2793
diff changeset
323 strings.extend(["+{distance}".format(**hg_data)])
2573
18e2ca5f798e tools (utils): better repository version handling:
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diff changeset
324 except KeyError:
18e2ca5f798e tools (utils): better repository version handling:
Goffi <goffi@goffi.org>
parents: 2568
diff changeset
325 pass
3028
ab2696e34d29 Python 3 port:
Goffi <goffi@goffi.org>
parents: 2793
diff changeset
326 repos_cache = " ".join(strings)
2573
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diff changeset
327 return repos_cache
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parents: 916
diff changeset
328 else:
3a20312d4012 core: if we are in dev version and it's possible, repository data are now checked and added to SàT version
Goffi <goffi@goffi.org>
parents: 916
diff changeset
329 return hg_data