Mercurial > hg
annotate mercurial/changelog.py @ 8699:f364cc1d98c4
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author | Matt Mackall <mpm@selenic.com> |
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date | Mon, 01 Jun 2009 13:51:21 -0500 |
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1095 | 1 # changelog.py - changelog class for mercurial |
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2 # |
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3 # Copyright 2005-2007 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 of the |
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6 # GNU General Public License version 2, incorporated herein by reference. |
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7 |
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8 from node import bin, hex, nullid |
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9 from i18n import _ |
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10 import util, error, revlog, encoding |
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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 == res.decode('string_escape') |
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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 decodeextra(text): |
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27 extra = {} |
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28 for l in text.split('\0'): |
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29 if l: |
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30 k, v = l.decode('string_escape').split(':', 1) |
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31 extra[k] = v |
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32 return extra |
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33 |
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34 def encodeextra(d): |
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35 # keys must be sorted to produce a deterministic changelog entry |
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36 items = [_string_escape('%s:%s' % (k, d[k])) for k in sorted(d)] |
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37 return "\0".join(items) |
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38 |
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39 class appender: |
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40 '''the changelog index must be updated last on disk, so we use this class |
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41 to delay writes to it''' |
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42 def __init__(self, fp, buf): |
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43 self.data = buf |
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44 self.fp = fp |
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45 self.offset = fp.tell() |
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46 self.size = util.fstat(fp).st_size |
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47 |
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48 def end(self): |
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49 return self.size + len("".join(self.data)) |
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50 def tell(self): |
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51 return self.offset |
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52 def flush(self): |
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53 pass |
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54 def close(self): |
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55 self.fp.close() |
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56 |
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57 def seek(self, offset, whence=0): |
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58 '''virtual file offset spans real file and data''' |
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59 if whence == 0: |
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60 self.offset = offset |
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61 elif whence == 1: |
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62 self.offset += offset |
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63 elif whence == 2: |
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64 self.offset = self.end() + offset |
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65 if self.offset < self.size: |
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66 self.fp.seek(self.offset) |
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67 |
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68 def read(self, count=-1): |
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69 '''only trick here is reads that span real file and data''' |
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70 ret = "" |
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71 if self.offset < self.size: |
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72 s = self.fp.read(count) |
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73 ret = s |
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74 self.offset += len(s) |
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75 if count > 0: |
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76 count -= len(s) |
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77 if count != 0: |
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78 doff = self.offset - self.size |
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79 self.data.insert(0, "".join(self.data)) |
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80 del self.data[1:] |
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81 s = self.data[0][doff:doff+count] |
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82 self.offset += len(s) |
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83 ret += s |
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84 return ret |
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85 |
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86 def write(self, s): |
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87 self.data.append(str(s)) |
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88 self.offset += len(s) |
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89 |
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90 class changelog(revlog.revlog): |
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91 def __init__(self, opener): |
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92 self._realopener = opener |
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93 self._delayed = False |
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94 revlog.revlog.__init__(self, self._delayopener, "00changelog.i") |
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95 |
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96 def delayupdate(self): |
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97 "delay visibility of index updates to other readers" |
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98 self._delayed = True |
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99 self._delaycount = len(self) |
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100 self._delaybuf = [] |
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101 self._delayname = None |
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102 |
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103 def finalize(self, tr): |
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104 "finalize index updates" |
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105 self._delayed = False |
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106 # move redirected index data back into place |
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107 if self._delayname: |
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108 util.rename(self._delayname + ".a", self._delayname) |
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109 elif self._delaybuf: |
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110 fp = self.opener(self.indexfile, 'a') |
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111 fp.write("".join(self._delaybuf)) |
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112 fp.close() |
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113 self._delaybuf = [] |
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114 # split when we're done |
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115 self.checkinlinesize(tr) |
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116 |
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117 def _delayopener(self, name, mode='r'): |
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118 fp = self._realopener(name, mode) |
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119 # only divert the index |
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120 if not self._delayed or not name == self.indexfile: |
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121 return fp |
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122 # if we're doing an initial clone, divert to another file |
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123 if self._delaycount == 0: |
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124 self._delayname = fp.name |
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125 if not len(self): |
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126 # make sure to truncate the file |
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127 mode = mode.replace('a', 'w') |
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128 return self._realopener(name + ".a", mode) |
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129 # otherwise, divert to memory |
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130 return appender(fp, self._delaybuf) |
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131 |
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132 def readpending(self, file): |
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133 r = revlog.revlog(self.opener, file) |
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134 self.index = r.index |
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135 self.nodemap = r.nodemap |
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136 self._chunkcache = r._chunkcache |
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137 |
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138 def writepending(self): |
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139 "create a file containing the unfinalized state for pretxnchangegroup" |
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140 if self._delaybuf: |
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141 # make a temporary copy of the index |
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142 fp1 = self._realopener(self.indexfile) |
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143 fp2 = self._realopener(self.indexfile + ".a", "w") |
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144 fp2.write(fp1.read()) |
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145 # add pending data |
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146 fp2.write("".join(self._delaybuf)) |
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147 fp2.close() |
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148 # switch modes so finalize can simply rename |
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149 self._delaybuf = [] |
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150 self._delayname = fp1.name |
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151 |
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152 if self._delayname: |
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153 return True |
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154 |
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155 return False |
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156 |
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157 def checkinlinesize(self, tr, fp=None): |
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158 if self.opener == self._delayopener: |
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159 return |
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160 return revlog.revlog.checkinlinesize(self, tr, fp) |
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161 |
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162 def read(self, node): |
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163 """ |
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164 format used: |
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165 nodeid\n : manifest node in ascii |
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166 user\n : user, no \n or \r allowed |
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167 time tz extra\n : date (time is int or float, timezone is int) |
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168 : extra is metadatas, encoded and separated by '\0' |
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169 : older versions ignore it |
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170 files\n\n : files modified by the cset, no \n or \r allowed |
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171 (.*) : comment (free text, ideally utf-8) |
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172 |
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173 changelog v0 doesn't use extra |
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174 """ |
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175 text = self.revision(node) |
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177 return (nullid, "", (0, 0), [], "", {'branch': 'default'}) |
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178 last = text.index("\n\n") |
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179 desc = encoding.tolocal(text[last + 2:]) |
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180 l = text[:last].split('\n') |
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181 manifest = bin(l[0]) |
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182 user = encoding.tolocal(l[1]) |
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183 |
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184 extra_data = l[2].split(' ', 2) |
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185 if len(extra_data) != 3: |
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186 time = float(extra_data.pop(0)) |
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187 try: |
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188 # various tools did silly things with the time zone field. |
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189 timezone = int(extra_data[0]) |
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190 except: |
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191 timezone = 0 |
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192 extra = {} |
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193 else: |
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194 time, timezone, extra = extra_data |
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195 time, timezone = float(time), int(timezone) |
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196 extra = decodeextra(extra) |
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197 if not extra.get('branch'): |
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198 extra['branch'] = 'default' |
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199 files = l[3:] |
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200 return (manifest, user, (time, timezone), files, desc, extra) |
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201 |
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202 def add(self, manifest, files, desc, transaction, p1, p2, |
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203 user, date=None, extra={}): |
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204 user = user.strip() |
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205 # An empty username or a username with a "\n" will make the |
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206 # revision text contain two "\n\n" sequences -> corrupt |
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207 # repository since read cannot unpack the revision. |
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208 if not user: |
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209 raise error.RevlogError(_("empty username")) |
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210 if "\n" in user: |
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212 % repr(user)) | |
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213 |
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214 # strip trailing whitespace and leading and trailing empty lines |
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215 desc = '\n'.join([l.rstrip() for l in desc.splitlines()]).strip('\n') |
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216 |
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217 user, desc = encoding.fromlocal(user), encoding.fromlocal(desc) |
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218 |
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219 if date: |
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220 parseddate = "%d %d" % util.parsedate(date) |
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221 else: |
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222 parseddate = "%d %d" % util.makedate() |
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223 if extra and extra.get("branch") in ("default", ""): |
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224 del extra["branch"] |
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225 if extra: |
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226 extra = encodeextra(extra) |
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227 parseddate = "%s %s" % (parseddate, extra) |
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228 l = [hex(manifest), user, parseddate] + sorted(files) + ["", desc] |
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229 text = "\n".join(l) |
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230 return self.addrevision(text, transaction, len(self), p1, p2) |