Mercurial > public > mercurial-scm > hg-stable

annotate mercurial/changelog.py @ 4261:cd7b36b7869c

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restructure changelog file appending - make appending code proper part of changelog with delayupdate/finalize - use simplified appender that tracks pending data in memory - eliminate old appendfile and helper classes - update addchangegroup to use new interface and reuse the existing changelog
author Matt Mackall <mpm@selenic.com>
date Thu, 22 Mar 2007 23:37:44 -0500
parents b11a2fb59cf5
children 73c918c71300
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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._appendopener
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89 self._delaybuf = []
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90
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91 def finalize(self, tr):
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92 "finalize index updates"
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93 self.opener = self._realopener
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94 if self._delaybuf:
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95 fp = self.opener(self.indexfile, 'a')
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96 fp.write("".join(self._delaybuf))
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97 fp.close()
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98 del self._delaybuf
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99 self.checkinlinesize(tr)
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100
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101 def _appendopener(self, name, mode='r'):
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102 fp = self._realopener(name, mode)
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103 if not name == self.indexfile:
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104 return fp
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105 return appender(fp, self._delaybuf)
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106
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107 def checkinlinesize(self, tr, fp=None):
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108 if self.opener == self._appendopener:
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109 return
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110 return revlog.checkinlinesize(self, tr, fp)
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111
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112 def decode_extra(self, text):
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113 extra = {}
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114 for l in text.split('\0'):
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115 if not l:
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116 continue
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117 k, v = _string_unescape(l).split(':', 1)
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118 extra[k] = v
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119 return extra
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120
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121 def encode_extra(self, d):
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122 items = [_string_escape(":".join(t)) for t in d.iteritems()]
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123 return "\0".join(items)
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124
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125 def extract(self, text):
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126 """
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127 format used:
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128 nodeid\n : manifest node in ascii
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129 user\n : user, no \n or \r allowed
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130 time tz extra\n : date (time is int or float, timezone is int)
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131 : extra is metadatas, encoded and separated by '\0'
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132 : older versions ignore it
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133 files\n\n : files modified by the cset, no \n or \r allowed
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134 (.*) : comment (free text, ideally utf-8)
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135
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136 changelog v0 doesn't use extra
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137 """
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138 if not text:
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139 return (nullid, "", (0, 0), [], "", {'branch': 'default'})
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140 last = text.index("\n\n")
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141 desc = util.tolocal(text[last + 2:])
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142 l = text[:last].split('\n')
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143 manifest = bin(l[0])
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144 user = util.tolocal(l[1])
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145
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146 extra_data = l[2].split(' ', 2)
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147 if len(extra_data) != 3:
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148 time = float(extra_data.pop(0))
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149 try:
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150 # various tools did silly things with the time zone field.
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151 timezone = int(extra_data[0])
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152 except:
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153 timezone = 0
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154 extra = {}
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155 else:
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156 time, timezone, extra = extra_data
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157 time, timezone = float(time), int(timezone)
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158 extra = self.decode_extra(extra)
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159 if not extra.get('branch'):
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160 extra['branch'] = 'default'
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161 files = l[3:]
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162 return (manifest, user, (time, timezone), files, desc, extra)
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163
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164 def read(self, node):
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165 return self.extract(self.revision(node))
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166
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167 def add(self, manifest, list, desc, transaction, p1=None, p2=None,
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168 user=None, date=None, extra={}):
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169
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170 user, desc = util.fromlocal(user), util.fromlocal(desc)
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171
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172 if date:
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173 parseddate = "%d %d" % util.parsedate(date)
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174 else:
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175 parseddate = "%d %d" % util.makedate()
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176 if extra and extra.get("branch") in ("default", ""):
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177 del extra["branch"]
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178 if extra:
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179 extra = self.encode_extra(extra)
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180 parseddate = "%s %s" % (parseddate, extra)
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181 list.sort()
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182 l = [hex(manifest), user, parseddate] + list + ["", desc]
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183 text = "\n".join(l)
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184 return self.addrevision(text, transaction, self.count(), p1, p2)