Mercurial > treepkg > treepkg

annotate treepkg/git.py @ 508:29f6d1f5cc53

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
add a tag detector for git
author Bjoern Ricks <bricks@intevation.de>
date Mon, 08 Nov 2010 17:07:41 +0000
parents fd52f1e231ba
children c4288095887f
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=None):
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25 """Clones the repository at url into the localdir"""
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26 run.call(cmdexpand("git clone $url $localdir", **locals()))
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27 if branch:
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28 run.call(cmdexpand("git checkout --track -b local $branch",
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29 **locals()), cwd=localdir)
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30 else:
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31 run.call(cmdexpand("git checkout --track -b local master"),
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32 cwd=localdir)
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33
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34 def update(localdir, revision=None):
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35 """Runs git pull on the localdir."""
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36 run.call(cmdexpand("git pull -q"), cwd=localdir)
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37
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38 def export(src, dest):
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39 """Exports the local branch from src to dest"""
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40 dest = dest + os.sep
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41 run.call(cmdexpand("git checkout-index -a -f --prefix=$dest", **locals()),
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42 cwd=src)
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43
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44 def last_changed_revision(git_working_copy):
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45 """Return the SHA1 sum of the latest commit"""
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46 output = run.capture_output(cmdexpand("git rev-parse HEAD"),
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47 cwd=git_working_copy)
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48 if output is None:
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49 raise GitError("Cannot determine last changed revision for %r"
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50 % git_working_copy)
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51 return output.strip()
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52
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53 class GitRepository(object):
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54
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55 """Describes a git repository"""
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56
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57 def __init__(self, url, branch=None):
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58 """Initialize the git repository description
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59 Parameters:
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60 url -- The url of the repository
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61
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62 branch -- The name of the remote Branch to track
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63 defaults to master
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64 """
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65 self.url = url
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66 self.branch = branch
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67
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68 def checkout(self, localdir):
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69 """Checks out the repository into localdir."""
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70 checkout(self.url , localdir, self.branch)
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71 update(localdir)
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72
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73 def export(self, localdir, destdir):
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74 """Exports the working copy in localdir to destdir"""
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75 export(localdir, destdir)
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76
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77 def last_changed_revision(self, localdir):
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78 """Returns the last changed revision of the working copy in localdir"""
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79 return last_changed_revision(localdir)
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80
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81 def check_working_copy(self, localdir):
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82 """FIXME STUB: Not implemented for git"""
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83 return None
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84
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85 class GitWorkingCopy(object):
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86
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87 """Represents a checkout of a git repository"""
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88
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89 def __init__(self, repository, localdir, logger=None):
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90 """
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91 Initialize the working copy.
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92 Parameters:
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93 repository -- The GitRepository instance describing the
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94 repository
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95 localdir -- The directory for the working copy
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96 logger -- logging object to use for some info/debug messages
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97 """
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98 self.repository = repository
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99 self.localdir = localdir
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100 self.logger = logger
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101
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102 def log_info(self, *args):
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103 if self.logger is not None:
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104 self.logger.info(*args)
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105
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106 def update_or_checkout(self, revision=0):
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107 """Updates the working copy or creates by checking out the repository.
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108 Revision number included for compatibility
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109 """
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110 if os.path.exists(self.localdir):
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111 self.log_info("Updating the working copy in %r", self.localdir)
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112 update(self.localdir, self.repository.branch)
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113 else:
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114 self.log_info("The working copy in %r doesn't exist yet."
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115 " Checking out from %r",
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116 self.localdir, self.repository.url)
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117 self.repository.checkout(self.localdir)
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118
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119 def export(self, destdir):
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120 """Exports the working copy to destdir"""
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121 self.repository.export(self.localdir, destdir)
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122
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123 def last_changed_revision(self):
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124 """Returns the last changed rev of the working copy"""
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125 return self.repository.last_changed_revision(self.localdir)
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126
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127 def list_tags(self, pattern):
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128 output = run.capture_output(cmdexpand("git tag -l $pattern",
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129 pattern=pattern), cwd=self.localdir)
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130 return output.splitlines()
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131
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132 def get_revision(self, refname="HEAD"):
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133 """Return the SHA1 sum of the latest commit"""
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134 output = run.capture_output(cmdexpand("git rev-parse $id",
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135 refname=refname), cwd=git_working_copy)
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136 if output is None:
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137 raise GitError("Cannot determine revision for %r"
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138 % git_working_copy)
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139 return output.strip()
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140
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141 class TagDetector:
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142
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143 """Class to detect tags from a git repository
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144
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145 The tags are found using the parameters:
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146 url -- The url of the git repository to use
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147 pattern -- A regular expression matching the tags
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148 """
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149
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150 def __init__(self, url, pattern, localdir):
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151 self.url = url
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152 self.pattern = pattern
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153 repo = GitRepository(url)
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154 self.workingcopy = GitWorkingCopy(repo, localdir)
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155
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156 def newest_tag_revision(self):
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157 self.workingcopy.update_or_checkout()
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158 candidates = self.workingcopy.list_tags(self.pattern)
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159 candidates = sorted(candidates)
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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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