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annotate treepkg/git.py @ 509:c4288095887f

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update git tag detector and add test
author Bjoern Ricks <bricks@intevation.de>
date Tue, 09 Nov 2010 14:54:55 +0000
parents 29f6d1f5cc53
children 0365b2c7ac00
rev   line source
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1 # Copyright (C) 2010 by Intevation GmbH
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2 # Authors:
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3 # Andre Heinecke <aheinecke@intevation.de>
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4 #
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5 # This program is free software under the GPL (>=v2)
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6 # Read the file COPYING coming with the software for details.
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7
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8 """Collection of Git utility code"""
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9
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10 import os
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11 import shutil
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12 import re
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13 import StringIO
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14
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15 import run
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16 from cmdexpand import cmdexpand
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17 from util import extract_value_for_key
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18
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19
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20 class GitError(Exception):
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21
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22 """Base class for Git specific errors raised by TreePKG"""
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23
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24 def checkout(url, localdir, branch="master"):
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25 """Clones the repository at url into the localdir"""
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26 run.call(cmdexpand("git clone -q $url $localdir", **locals()))
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27 if branch:
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28 run.call(cmdexpand("git checkout -q --track -b local $branch",
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29 **locals()), cwd=localdir)
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30
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31 def update(localdir, revision=None):
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32 """Runs git pull on the localdir."""
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33 run.call(cmdexpand("git pull -q"), cwd=localdir)
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34
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35 def export(src, dest):
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36 """Exports the local branch from src to dest"""
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37 dest = dest + os.sep
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38 run.call(cmdexpand("git checkout-index -a -f --prefix=$dest", **locals()),
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39 cwd=src)
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40
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41 def last_changed_revision(git_working_copy):
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42 """Return the SHA1 sum of the latest commit"""
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43 output = run.capture_output(cmdexpand("git rev-parse HEAD"),
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44 cwd=git_working_copy)
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45 if output is None:
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46 raise GitError("Cannot determine last changed revision for %r"
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47 % git_working_copy)
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48 return output.strip()
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49
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50 class GitRepository(object):
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51
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52 """Describes a git repository"""
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53
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54 def __init__(self, url, branch=None):
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55 """Initialize the git repository description
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56 Parameters:
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57 url -- The url of the repository
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58
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59 branch -- The name of the remote Branch to track
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60 defaults to master
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61 """
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62 self.url = url
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63 self.branch = branch
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64
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65 def checkout(self, localdir):
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66 """Checks out the repository into localdir."""
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67 checkout(self.url , localdir, self.branch)
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68
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69 def export(self, localdir, destdir):
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70 """Exports the working copy in localdir to destdir"""
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71 export(localdir, destdir)
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72
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73 def last_changed_revision(self, localdir):
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74 """Returns the last changed revision of the working copy in localdir"""
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75 return last_changed_revision(localdir)
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76
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77 def check_working_copy(self, localdir):
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78 """FIXME STUB: Not implemented for git"""
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79 return None
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80
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81 class GitWorkingCopy(object):
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82
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83 """Represents a checkout of a git repository"""
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84
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85 def __init__(self, repository, localdir, logger=None):
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86 """
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87 Initialize the working copy.
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88 Parameters:
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89 repository -- The GitRepository instance describing the
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90 repository
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91 localdir -- The directory for the working copy
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92 logger -- logging object to use for some info/debug messages
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93 """
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94 self.repository = repository
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95 self.localdir = localdir
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96 self.logger = logger
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97
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98 def log_info(self, *args):
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99 if self.logger is not None:
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100 self.logger.info(*args)
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101
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102 def update_or_checkout(self, revision=0):
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103 """Updates the working copy or creates by checking out the repository.
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104 Revision number included for compatibility
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105 """
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106 gitdir = os.path.join(self.localdir, ".git")
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107 if os.path.exists(gitdir):
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108 self.log_info("Updating the working copy in %r", self.localdir)
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109 update(self.localdir, self.repository.branch)
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110 else:
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111 self.log_info("The working copy in %r doesn't exist yet."
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112 " Checking out from %r",
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113 self.localdir, self.repository.url)
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114 self.repository.checkout(self.localdir)
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115
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116 def export(self, destdir):
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117 """Exports the working copy to destdir"""
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118 self.repository.export(self.localdir, destdir)
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119
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120 def last_changed_revision(self):
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121 """Returns the last changed rev of the working copy"""
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122 return self.repository.last_changed_revision(self.localdir)
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123
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124 def list_tags(self, pattern):
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125 output = run.capture_output(cmdexpand("git tag -l $pattern",
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126 pattern=pattern), cwd=self.localdir)
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127 return output.splitlines()
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128
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129 def get_revision(self, refname="HEAD"):
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130 """Return the SHA1 sum of the latest commit"""
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131 output = run.capture_output(cmdexpand("git rev-parse $refname",
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132 refname=refname), cwd=self.localdir)
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133 if output is None:
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134 raise GitError("Cannot determine revision for %r"
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135 % self.localdir)
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136 return output.strip()
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137
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138 class TagDetector:
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139
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140 """Class to detect tags from a git repository
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141
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142 The tags are found using the parameters:
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143 url -- The url of the git repository to use
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144 pattern -- A regular expression matching the tags
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145 """
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146
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147 def __init__(self, url, pattern, localdir):
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148 self.url = url
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149 self.pattern = pattern
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150 repo = GitRepository(url)
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151 self.workingcopy = GitWorkingCopy(repo, localdir)
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152
509
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153 def list_tags(self):
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154 self.workingcopy.update_or_checkout()
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155 tags = self.workingcopy.list_tags(self.pattern)
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156 return sorted(tags)
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157
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158 def newest_tag_revision(self):
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159 candidates = self.list_tags()
508
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160 urlrev = (None, None)
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161 if candidates:
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162 newest = candidates[-1]
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163 try:
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164 rev = self.workingcopy.get_revision(newest)
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165 urlrev = (newest, rev)
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166 except GitError:
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167 pass
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168 return urlrev
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