Mercurial > hg
annotate hgext/fastannotate/protocol.py @ 50225:53ca3e3bc013 stable
rhg: fix race when a fixup file is deleted on disk
See next changeset for the other race in the same kind of logic and why
there are two different places.
author | Raphaël Gomès <rgomes@octobus.net> |
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date | Mon, 27 Feb 2023 15:18:50 +0100 |
parents | f254fc73d956 |
children | 8c6f783917e7 |
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1 # Copyright 2016-present Facebook. All Rights Reserved. |
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2 # |
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3 # protocol: logic for a server providing fastannotate support |
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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 or any later version. |
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7 |
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8 import contextlib |
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9 import os |
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10 |
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11 from mercurial.i18n import _ |
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12 from mercurial.pycompat import open |
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13 from mercurial import ( |
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14 error, |
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15 extensions, |
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16 hg, |
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17 util, |
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18 wireprotov1peer, |
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19 wireprotov1server, |
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20 ) |
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21 from mercurial.utils import ( |
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22 urlutil, |
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23 ) |
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24 from . import context |
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25 |
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26 # common |
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27 |
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28 |
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29 def _getmaster(ui): |
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30 """get the mainbranch, and enforce it is set""" |
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31 master = ui.config(b'fastannotate', b'mainbranch') |
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32 if not master: |
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33 raise error.Abort( |
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34 _( |
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35 b'fastannotate.mainbranch is required ' |
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36 b'for both the client and the server' |
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37 ) |
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38 ) |
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39 return master |
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40 |
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41 |
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42 # server-side |
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43 |
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44 |
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45 def _capabilities(orig, repo, proto): |
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46 result = orig(repo, proto) |
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47 result.append(b'getannotate') |
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48 return result |
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49 |
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50 |
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51 def _getannotate(repo, proto, path, lastnode): |
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52 # output: |
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53 # FILE := vfspath + '\0' + str(size) + '\0' + content |
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54 # OUTPUT := '' | FILE + OUTPUT |
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55 result = b'' |
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56 buildondemand = repo.ui.configbool( |
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57 b'fastannotate', b'serverbuildondemand', True |
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58 ) |
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59 with context.annotatecontext(repo, path) as actx: |
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60 if buildondemand: |
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61 # update before responding to the client |
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62 master = _getmaster(repo.ui) |
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63 try: |
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64 if not actx.isuptodate(master): |
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65 actx.annotate(master, master) |
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66 except Exception: |
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67 # non-fast-forward move or corrupted. rebuild automically. |
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68 actx.rebuild() |
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69 try: |
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70 actx.annotate(master, master) |
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71 except Exception: |
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72 actx.rebuild() # delete files |
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73 finally: |
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74 # although the "with" context will also do a close/flush, we |
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75 # need to do it early so we can send the correct respond to |
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76 # client. |
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77 actx.close() |
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78 # send back the full content of revmap and linelog, in the future we |
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79 # may want to do some rsync-like fancy updating. |
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80 # the lastnode check is not necessary if the client and the server |
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81 # agree where the main branch is. |
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82 if actx.lastnode != lastnode: |
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83 for p in [actx.revmappath, actx.linelogpath]: |
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84 if not os.path.exists(p): |
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85 continue |
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86 with open(p, b'rb') as f: |
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87 content = f.read() |
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88 vfsbaselen = len(repo.vfs.base + b'/') |
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89 relpath = p[vfsbaselen:] |
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90 result += b'%s\0%d\0%s' % (relpath, len(content), content) |
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91 return result |
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92 |
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93 |
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94 def _registerwireprotocommand(): |
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95 if b'getannotate' in wireprotov1server.commands: |
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96 return |
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97 wireprotov1server.wireprotocommand(b'getannotate', b'path lastnode')( |
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98 _getannotate |
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99 ) |
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100 |
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101 |
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102 def serveruisetup(ui): |
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103 _registerwireprotocommand() |
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104 extensions.wrapfunction(wireprotov1server, b'_capabilities', _capabilities) |
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105 |
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106 |
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107 # client-side |
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108 |
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109 |
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110 def _parseresponse(payload): |
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111 result = {} |
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112 i = 0 |
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113 l = len(payload) - 1 |
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114 state = 0 # 0: vfspath, 1: size |
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115 vfspath = size = b'' |
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116 while i < l: |
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117 ch = payload[i : i + 1] |
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118 if ch == b'\0': |
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119 if state == 1: |
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120 result[vfspath] = payload[i + 1 : i + 1 + int(size)] |
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121 i += int(size) |
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122 state = 0 |
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123 vfspath = size = b'' |
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124 elif state == 0: |
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125 state = 1 |
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126 else: |
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127 if state == 1: |
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128 size += ch |
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129 elif state == 0: |
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130 vfspath += ch |
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131 i += 1 |
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132 return result |
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133 |
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134 |
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135 def peersetup(ui, peer): |
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136 class fastannotatepeer(peer.__class__): |
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137 @wireprotov1peer.batchable |
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138 def getannotate(self, path, lastnode=None): |
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139 if not self.capable(b'getannotate'): |
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140 ui.warn(_(b'remote peer cannot provide annotate cache\n')) |
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141 return None, None |
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142 else: |
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143 args = {b'path': path, b'lastnode': lastnode or b''} |
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144 return args, _parseresponse |
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145 |
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146 peer.__class__ = fastannotatepeer |
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147 |
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148 |
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149 @contextlib.contextmanager |
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150 def annotatepeer(repo): |
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151 ui = repo.ui |
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152 |
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153 remotedest = ui.config(b'fastannotate', b'remotepath', b'default') |
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154 r = urlutil.get_unique_pull_path(b'fastannotate', repo, ui, remotedest) |
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155 remotepath = r[0] |
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156 peer = hg.peer(ui, {}, remotepath) |
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157 |
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158 try: |
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159 yield peer |
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160 finally: |
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161 peer.close() |
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162 |
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163 |
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164 def clientfetch(repo, paths, lastnodemap=None, peer=None): |
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165 """download annotate cache from the server for paths""" |
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166 if not paths: |
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167 return |
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168 |
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169 if peer is None: |
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170 with annotatepeer(repo) as peer: |
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171 return clientfetch(repo, paths, lastnodemap, peer) |
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172 |
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173 if lastnodemap is None: |
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174 lastnodemap = {} |
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175 |
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176 ui = repo.ui |
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177 results = [] |
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178 with peer.commandexecutor() as batcher: |
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179 ui.debug(b'fastannotate: requesting %d files\n' % len(paths)) |
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180 for p in paths: |
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181 results.append( |
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182 batcher.callcommand( |
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183 b'getannotate', |
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184 {b'path': p, b'lastnode': lastnodemap.get(p)}, |
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185 ) |
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186 ) |
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187 |
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188 for result in results: |
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189 r = result.result() |
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190 # TODO: pconvert these paths on the server? |
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191 r = {util.pconvert(p): v for p, v in r.items()} |
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192 for path in sorted(r): |
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193 # ignore malicious paths |
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194 if not path.startswith(b'fastannotate/') or b'/../' in ( |
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195 path + b'/' |
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196 ): |
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197 ui.debug( |
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198 b'fastannotate: ignored malicious path %s\n' % path |
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199 ) |
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200 continue |
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201 content = r[path] |
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202 if ui.debugflag: |
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203 ui.debug( |
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204 b'fastannotate: writing %d bytes to %s\n' |
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205 % (len(content), path) |
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206 ) |
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207 repo.vfs.makedirs(os.path.dirname(path)) |
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208 with repo.vfs(path, b'wb') as f: |
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209 f.write(content) |
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210 |
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211 |
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212 def _filterfetchpaths(repo, paths): |
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213 """return a subset of paths whose history is long and need to fetch linelog |
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214 from the server. works with remotefilelog and non-remotefilelog repos. |
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215 """ |
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216 threshold = repo.ui.configint(b'fastannotate', b'clientfetchthreshold', 10) |
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217 if threshold <= 0: |
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218 return paths |
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219 |
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220 result = [] |
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221 for path in paths: |
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222 try: |
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223 if len(repo.file(path)) >= threshold: |
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224 result.append(path) |
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225 except Exception: # file not found etc. |
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226 result.append(path) |
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227 |
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228 return result |
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229 |
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230 |
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231 def localreposetup(ui, repo): |
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232 class fastannotaterepo(repo.__class__): |
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233 def prefetchfastannotate(self, paths, peer=None): |
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234 master = _getmaster(self.ui) |
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235 needupdatepaths = [] |
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236 lastnodemap = {} |
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237 try: |
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238 for path in _filterfetchpaths(self, paths): |
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239 with context.annotatecontext(self, path) as actx: |
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240 if not actx.isuptodate(master, strict=False): |
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241 needupdatepaths.append(path) |
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242 lastnodemap[path] = actx.lastnode |
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243 if needupdatepaths: |
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244 clientfetch(self, needupdatepaths, lastnodemap, peer) |
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245 except Exception as ex: |
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246 # could be directory not writable or so, not fatal |
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247 self.ui.debug(b'fastannotate: prefetch failed: %r\n' % ex) |
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248 |
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249 repo.__class__ = fastannotaterepo |
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250 |
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251 |
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252 def clientreposetup(ui, repo): |
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253 _registerwireprotocommand() |
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254 if repo.local(): |
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255 localreposetup(ui, repo) |
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256 # TODO: this mutates global state, but only if at least one repo |
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257 # has the extension enabled. This is probably bad for hgweb. |
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258 if peersetup not in hg.wirepeersetupfuncs: |
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259 hg.wirepeersetupfuncs.append(peersetup) |