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annotate mercurial/changelog.py @ 4269:73c918c71300

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changelog: optimize delayed updates for clone vs pull pull index updates get redirected to memory, then appended on finalize clone index updates get sent to 00changelog.i.a, then renamed on finalize
author Matt Mackall <mpm@selenic.com>
date Sat, 24 Mar 2007 02:47:33 -0500
parents cd7b36b7869c
children
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1 # changelog.py - changelog class for mercurial
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2 #
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3 # Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
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4 #
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5 # This software may be used and distributed according to the terms
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6 # of the GNU General Public License, incorporated herein by reference.
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7
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8 from revlog import *
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9 from i18n import _
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10 import os, time, util
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11
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12 def _string_escape(text):
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13 """
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14 >>> d = {'nl': chr(10), 'bs': chr(92), 'cr': chr(13), 'nul': chr(0)}
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15 >>> s = "ab%(nl)scd%(bs)s%(bs)sn%(nul)sab%(cr)scd%(bs)s%(nl)s" % d
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16 >>> s
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17 'ab\\ncd\\\\\\\\n\\x00ab\\rcd\\\\\\n'
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18 >>> res = _string_escape(s)
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19 >>> s == _string_unescape(res)
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20 True
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21 """
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22 # subset of the string_escape codec
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23 text = text.replace('\\', '\\\\').replace('\n', '\\n').replace('\r', '\\r')
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24 return text.replace('\0', '\\0')
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25
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26 def _string_unescape(text):
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27 return text.decode('string_escape')
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28
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29 class appender:
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30 '''the changelog index must be update last on disk, so we use this class
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31 to delay writes to it'''
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32 def __init__(self, fp, buf):
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33 self.data = buf
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34 self.fp = fp
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35 self.offset = fp.tell()
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36 self.size = util.fstat(fp).st_size
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37
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38 def end(self):
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39 return self.size + len("".join(self.data))
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40 def tell(self):
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41 return self.offset
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42 def flush(self):
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43 pass
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44 def close(self):
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45 close(self.fp)
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46
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47 def seek(self, offset, whence=0):
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48 '''virtual file offset spans real file and data'''
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49 if whence == 0:
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50 self.offset = offset
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51 elif whence == 1:
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52 self.offset += offset
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53 elif whence == 2:
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54 self.offset = self.end() + offset
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55 if self.offset < self.size:
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56 self.fp.seek(self.offset)
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57
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58 def read(self, count=-1):
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59 '''only trick here is reads that span real file and data'''
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60 ret = ""
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61 old_offset = self.offset
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62 if self.offset < self.size:
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63 s = self.fp.read(count)
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64 ret = s
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65 self.offset += len(s)
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66 if count > 0:
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67 count -= len(s)
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68 if count != 0:
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69 doff = self.offset - self.size
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70 self.data.insert(0, "".join(self.data))
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71 del self.data[1:]
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72 s = self.data[0][doff:doff+count]
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73 self.offset += len(s)
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74 ret += s
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75 return ret
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76
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77 def write(self, s):
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78 self.data.append(s)
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79 self.offset += len(s)
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80
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81 class changelog(revlog):
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82 def __init__(self, opener):
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83 revlog.__init__(self, opener, "00changelog.i")
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84
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85 def delayupdate(self):
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86 "delay visibility of index updates to other readers"
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87 self._realopener = self.opener
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88 self.opener = self._delayopener
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89 self._delaycount = self.count()
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90 self._delaybuf = []
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91 self._delayname = None
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92
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93 def finalize(self, tr):
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94 "finalize index updates"
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95 self.opener = self._realopener
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96 # move redirected index data back into place
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97 if self._delayname:
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98 util.rename(self._delayname + ".a", self._delayname)
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99 elif self._delaybuf:
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100 fp = self.opener(self.indexfile, 'a')
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101 fp.write("".join(self._delaybuf))
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102 fp.close()
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103 del self._delaybuf
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104 # split when we're done
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105 self.checkinlinesize(tr)
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106
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107 def _delayopener(self, name, mode='r'):
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108 fp = self._realopener(name, mode)
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109 # only divert the index
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110 if not name == self.indexfile:
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111 return fp
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112 # if we're doing an initial clone, divert to another file
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113 if self._delaycount == 0:
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114 self._delayname = fp.name
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115 return self._realopener(name + ".a", mode)
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116 # otherwise, divert to memory
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117 return appender(fp, self._delaybuf)
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118
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119 def checkinlinesize(self, tr, fp=None):
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120 if self.opener == self._delayopener:
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121 return
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122 return revlog.checkinlinesize(self, tr, fp)
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123
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124 def decode_extra(self, text):
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125 extra = {}
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126 for l in text.split('\0'):
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127 if not l:
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128 continue
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129 k, v = _string_unescape(l).split(':', 1)
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130 extra[k] = v
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131 return extra
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132
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133 def encode_extra(self, d):
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134 items = [_string_escape(":".join(t)) for t in d.iteritems()]
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135 return "\0".join(items)
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136
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137 def extract(self, text):
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138 """
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139 format used:
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140 nodeid\n : manifest node in ascii
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141 user\n : user, no \n or \r allowed
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142 time tz extra\n : date (time is int or float, timezone is int)
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143 : extra is metadatas, encoded and separated by '\0'
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144 : older versions ignore it
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145 files\n\n : files modified by the cset, no \n or \r allowed
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146 (.*) : comment (free text, ideally utf-8)
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147
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148 changelog v0 doesn't use extra
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149 """
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150 if not text:
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151 return (nullid, "", (0, 0), [], "", {'branch': 'default'})
0
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152 last = text.index("\n\n")
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153 desc = util.tolocal(text[last + 2:])
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154 l = text[:last].split('\n')
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155 manifest = bin(l[0])
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156 user = util.tolocal(l[1])
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157
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158 extra_data = l[2].split(' ', 2)
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159 if len(extra_data) != 3:
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160 time = float(extra_data.pop(0))
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161 try:
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162 # various tools did silly things with the time zone field.
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163 timezone = int(extra_data[0])
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164 except:
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165 timezone = 0
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166 extra = {}
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167 else:
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168 time, timezone, extra = extra_data
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169 time, timezone = float(time), int(timezone)
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170 extra = self.decode_extra(extra)
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171 if not extra.get('branch'):
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172 extra['branch'] = 'default'
0
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173 files = l[3:]
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174 return (manifest, user, (time, timezone), files, desc, extra)
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175
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176 def read(self, node):
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177 return self.extract(self.revision(node))
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178
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179 def add(self, manifest, list, desc, transaction, p1=None, p2=None,
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180 user=None, date=None, extra={}):
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181
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182 user, desc = util.fromlocal(user), util.fromlocal(desc)
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183
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184 if date:
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185 parseddate = "%d %d" % util.parsedate(date)
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186 else:
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187 parseddate = "%d %d" % util.makedate()
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188 if extra and extra.get("branch") in ("default", ""):
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189 del extra["branch"]
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190 if extra:
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191 extra = self.encode_extra(extra)
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192 parseddate = "%s %s" % (parseddate, extra)
0
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193 list.sort()
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194 l = [hex(manifest), user, parseddate] + list + ["", desc]
0
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195 text = "\n".join(l)
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196 return self.addrevision(text, transaction, self.count(), p1, p2)