Mercurial > hg
annotate mercurial/streamclone.py @ 35892:00a56c83ab64
revset: drop deprecated evolution predicates
author | Matt Harbison <matt_harbison@yahoo.com> |
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date | Fri, 02 Feb 2018 23:48:25 -0500 |
parents | 2d3e486d09d0 |
children | 65b86ee69383 |
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1 # streamclone.py - producing and consuming streaming repository data |
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2 # |
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3 # Copyright 2015 Gregory Szorc <gregory.szorc@gmail.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 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import contextlib |
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11 import os |
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12 import struct |
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13 import tempfile |
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14 import warnings |
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15 |
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16 from .i18n import _ |
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17 from . import ( |
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18 branchmap, |
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19 cacheutil, |
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20 error, |
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21 phases, |
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22 store, |
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23 util, |
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24 ) |
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25 |
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26 def canperformstreamclone(pullop, bundle2=False): |
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27 """Whether it is possible to perform a streaming clone as part of pull. |
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28 |
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29 ``bundle2`` will cause the function to consider stream clone through |
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30 bundle2 and only through bundle2. |
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31 |
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32 Returns a tuple of (supported, requirements). ``supported`` is True if |
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33 streaming clone is supported and False otherwise. ``requirements`` is |
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34 a set of repo requirements from the remote, or ``None`` if stream clone |
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35 isn't supported. |
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36 """ |
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37 repo = pullop.repo |
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38 remote = pullop.remote |
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39 |
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40 bundle2supported = False |
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41 if pullop.canusebundle2: |
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42 if 'v2' in pullop.remotebundle2caps.get('stream', []): |
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43 bundle2supported = True |
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44 # else |
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45 # Server doesn't support bundle2 stream clone or doesn't support |
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46 # the versions we support. Fall back and possibly allow legacy. |
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47 |
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48 # Ensures legacy code path uses available bundle2. |
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49 if bundle2supported and not bundle2: |
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50 return False, None |
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51 # Ensures bundle2 doesn't try to do a stream clone if it isn't supported. |
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52 elif bundle2 and not bundle2supported: |
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53 return False, None |
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54 |
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55 # Streaming clone only works on empty repositories. |
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56 if len(repo): |
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57 return False, None |
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58 |
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59 # Streaming clone only works if all data is being requested. |
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60 if pullop.heads: |
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61 return False, None |
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62 |
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63 streamrequested = pullop.streamclonerequested |
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64 |
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65 # If we don't have a preference, let the server decide for us. This |
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66 # likely only comes into play in LANs. |
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67 if streamrequested is None: |
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68 # The server can advertise whether to prefer streaming clone. |
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69 streamrequested = remote.capable('stream-preferred') |
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70 |
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71 if not streamrequested: |
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72 return False, None |
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73 |
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74 # In order for stream clone to work, the client has to support all the |
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75 # requirements advertised by the server. |
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76 # |
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77 # The server advertises its requirements via the "stream" and "streamreqs" |
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78 # capability. "stream" (a value-less capability) is advertised if and only |
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79 # if the only requirement is "revlogv1." Else, the "streamreqs" capability |
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80 # is advertised and contains a comma-delimited list of requirements. |
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81 requirements = set() |
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82 if remote.capable('stream'): |
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83 requirements.add('revlogv1') |
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84 else: |
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85 streamreqs = remote.capable('streamreqs') |
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86 # This is weird and shouldn't happen with modern servers. |
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87 if not streamreqs: |
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88 pullop.repo.ui.warn(_( |
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89 'warning: stream clone requested but server has them ' |
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90 'disabled\n')) |
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91 return False, None |
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92 |
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93 streamreqs = set(streamreqs.split(',')) |
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94 # Server requires something we don't support. Bail. |
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95 missingreqs = streamreqs - repo.supportedformats |
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96 if missingreqs: |
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97 pullop.repo.ui.warn(_( |
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98 'warning: stream clone requested but client is missing ' |
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99 'requirements: %s\n') % ', '.join(sorted(missingreqs))) |
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100 pullop.repo.ui.warn( |
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101 _('(see https://www.mercurial-scm.org/wiki/MissingRequirement ' |
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102 'for more information)\n')) |
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103 return False, None |
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104 requirements = streamreqs |
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105 |
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106 return True, requirements |
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107 |
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108 def maybeperformlegacystreamclone(pullop): |
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109 """Possibly perform a legacy stream clone operation. |
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110 |
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111 Legacy stream clones are performed as part of pull but before all other |
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112 operations. |
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113 |
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114 A legacy stream clone will not be performed if a bundle2 stream clone is |
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115 supported. |
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116 """ |
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117 supported, requirements = canperformstreamclone(pullop) |
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118 |
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119 if not supported: |
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120 return |
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121 |
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122 repo = pullop.repo |
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123 remote = pullop.remote |
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124 |
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125 # Save remote branchmap. We will use it later to speed up branchcache |
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126 # creation. |
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127 rbranchmap = None |
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128 if remote.capable('branchmap'): |
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129 rbranchmap = remote.branchmap() |
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130 |
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131 repo.ui.status(_('streaming all changes\n')) |
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132 |
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133 fp = remote.stream_out() |
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134 l = fp.readline() |
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135 try: |
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136 resp = int(l) |
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137 except ValueError: |
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138 raise error.ResponseError( |
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139 _('unexpected response from remote server:'), l) |
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140 if resp == 1: |
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141 raise error.Abort(_('operation forbidden by server')) |
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142 elif resp == 2: |
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143 raise error.Abort(_('locking the remote repository failed')) |
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144 elif resp != 0: |
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145 raise error.Abort(_('the server sent an unknown error code')) |
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146 |
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147 l = fp.readline() |
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148 try: |
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149 filecount, bytecount = map(int, l.split(' ', 1)) |
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150 except (ValueError, TypeError): |
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151 raise error.ResponseError( |
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152 _('unexpected response from remote server:'), l) |
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153 |
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154 with repo.lock(): |
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155 consumev1(repo, fp, filecount, bytecount) |
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156 |
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157 # new requirements = old non-format requirements + |
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158 # new format-related remote requirements |
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159 # requirements from the streamed-in repository |
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160 repo.requirements = requirements | ( |
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161 repo.requirements - repo.supportedformats) |
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162 repo._applyopenerreqs() |
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163 repo._writerequirements() |
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164 |
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165 if rbranchmap: |
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166 branchmap.replacecache(repo, rbranchmap) |
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167 |
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168 repo.invalidate() |
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169 |
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170 def allowservergeneration(repo): |
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171 """Whether streaming clones are allowed from the server.""" |
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172 if not repo.ui.configbool('server', 'uncompressed', untrusted=True): |
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173 return False |
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174 |
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175 # The way stream clone works makes it impossible to hide secret changesets. |
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176 # So don't allow this by default. |
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177 secret = phases.hassecret(repo) |
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178 if secret: |
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179 return repo.ui.configbool('server', 'uncompressedallowsecret') |
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180 |
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181 return True |
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182 |
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183 # This is it's own function so extensions can override it. |
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184 def _walkstreamfiles(repo): |
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185 return repo.store.walk() |
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186 |
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187 def generatev1(repo): |
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188 """Emit content for version 1 of a streaming clone. |
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189 |
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190 This returns a 3-tuple of (file count, byte size, data iterator). |
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191 |
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192 The data iterator consists of N entries for each file being transferred. |
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193 Each file entry starts as a line with the file name and integer size |
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194 delimited by a null byte. |
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195 |
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196 The raw file data follows. Following the raw file data is the next file |
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197 entry, or EOF. |
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198 |
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199 When used on the wire protocol, an additional line indicating protocol |
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200 success will be prepended to the stream. This function is not responsible |
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201 for adding it. |
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202 |
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203 This function will obtain a repository lock to ensure a consistent view of |
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204 the store is captured. It therefore may raise LockError. |
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205 """ |
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206 entries = [] |
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207 total_bytes = 0 |
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208 # Get consistent snapshot of repo, lock during scan. |
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209 with repo.lock(): |
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210 repo.ui.debug('scanning\n') |
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211 for name, ename, size in _walkstreamfiles(repo): |
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212 if size: |
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213 entries.append((name, size)) |
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214 total_bytes += size |
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215 |
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216 repo.ui.debug('%d files, %d bytes to transfer\n' % |
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217 (len(entries), total_bytes)) |
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218 |
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219 svfs = repo.svfs |
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220 debugflag = repo.ui.debugflag |
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221 |
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222 def emitrevlogdata(): |
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223 for name, size in entries: |
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224 if debugflag: |
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225 repo.ui.debug('sending %s (%d bytes)\n' % (name, size)) |
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226 # partially encode name over the wire for backwards compat |
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227 yield '%s\0%d\n' % (store.encodedir(name), size) |
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228 # auditing at this stage is both pointless (paths are already |
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229 # trusted by the local repo) and expensive |
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230 with svfs(name, 'rb', auditpath=False) as fp: |
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231 if size <= 65536: |
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232 yield fp.read(size) |
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233 else: |
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234 for chunk in util.filechunkiter(fp, limit=size): |
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235 yield chunk |
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236 |
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237 return len(entries), total_bytes, emitrevlogdata() |
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238 |
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239 def generatev1wireproto(repo): |
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240 """Emit content for version 1 of streaming clone suitable for the wire. |
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241 |
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242 This is the data output from ``generatev1()`` with 2 header lines. The |
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243 first line indicates overall success. The 2nd contains the file count and |
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244 byte size of payload. |
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245 |
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246 The success line contains "0" for success, "1" for stream generation not |
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247 allowed, and "2" for error locking the repository (possibly indicating |
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248 a permissions error for the server process). |
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249 """ |
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250 if not allowservergeneration(repo): |
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251 yield '1\n' |
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252 return |
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253 |
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254 try: |
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255 filecount, bytecount, it = generatev1(repo) |
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256 except error.LockError: |
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257 yield '2\n' |
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258 return |
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259 |
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260 # Indicates successful response. |
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261 yield '0\n' |
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262 yield '%d %d\n' % (filecount, bytecount) |
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263 for chunk in it: |
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264 yield chunk |
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265 |
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266 def generatebundlev1(repo, compression='UN'): |
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267 """Emit content for version 1 of a stream clone bundle. |
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268 |
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269 The first 4 bytes of the output ("HGS1") denote this as stream clone |
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270 bundle version 1. |
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271 |
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272 The next 2 bytes indicate the compression type. Only "UN" is currently |
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273 supported. |
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274 |
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275 The next 16 bytes are two 64-bit big endian unsigned integers indicating |
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276 file count and byte count, respectively. |
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277 |
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278 The next 2 bytes is a 16-bit big endian unsigned short declaring the length |
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279 of the requirements string, including a trailing \0. The following N bytes |
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280 are the requirements string, which is ASCII containing a comma-delimited |
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281 list of repo requirements that are needed to support the data. |
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282 |
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283 The remaining content is the output of ``generatev1()`` (which may be |
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284 compressed in the future). |
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285 |
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286 Returns a tuple of (requirements, data generator). |
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287 """ |
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288 if compression != 'UN': |
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289 raise ValueError('we do not support the compression argument yet') |
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290 |
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291 requirements = repo.requirements & repo.supportedformats |
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292 requires = ','.join(sorted(requirements)) |
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293 |
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294 def gen(): |
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295 yield 'HGS1' |
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296 yield compression |
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297 |
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298 filecount, bytecount, it = generatev1(repo) |
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299 repo.ui.status(_('writing %d bytes for %d files\n') % |
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300 (bytecount, filecount)) |
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301 |
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302 yield struct.pack('>QQ', filecount, bytecount) |
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303 yield struct.pack('>H', len(requires) + 1) |
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304 yield requires + '\0' |
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305 |
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306 # This is where we'll add compression in the future. |
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307 assert compression == 'UN' |
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308 |
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309 seen = 0 |
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310 repo.ui.progress(_('bundle'), 0, total=bytecount, unit=_('bytes')) |
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311 |
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312 for chunk in it: |
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313 seen += len(chunk) |
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314 repo.ui.progress(_('bundle'), seen, total=bytecount, |
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315 unit=_('bytes')) |
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316 yield chunk |
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317 |
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318 repo.ui.progress(_('bundle'), None) |
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319 |
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320 return requirements, gen() |
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321 |
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322 def consumev1(repo, fp, filecount, bytecount): |
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323 """Apply the contents from version 1 of a streaming clone file handle. |
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324 |
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325 This takes the output from "stream_out" and applies it to the specified |
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326 repository. |
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327 |
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328 Like "stream_out," the status line added by the wire protocol is not |
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329 handled by this function. |
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330 """ |
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331 with repo.lock(): |
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332 repo.ui.status(_('%d files to transfer, %s of data\n') % |
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333 (filecount, util.bytecount(bytecount))) |
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334 handled_bytes = 0 |
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335 repo.ui.progress(_('clone'), 0, total=bytecount, unit=_('bytes')) |
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336 start = util.timer() |
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337 |
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338 # TODO: get rid of (potential) inconsistency |
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339 # |
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340 # If transaction is started and any @filecache property is |
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341 # changed at this point, it causes inconsistency between |
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342 # in-memory cached property and streamclone-ed file on the |
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343 # disk. Nested transaction prevents transaction scope "clone" |
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344 # below from writing in-memory changes out at the end of it, |
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345 # even though in-memory changes are discarded at the end of it |
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346 # regardless of transaction nesting. |
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347 # |
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348 # But transaction nesting can't be simply prohibited, because |
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349 # nesting occurs also in ordinary case (e.g. enabling |
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350 # clonebundles). |
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351 |
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352 with repo.transaction('clone'): |
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353 with repo.svfs.backgroundclosing(repo.ui, expectedcount=filecount): |
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354 for i in xrange(filecount): |
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355 # XXX doesn't support '\n' or '\r' in filenames |
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356 l = fp.readline() |
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357 try: |
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358 name, size = l.split('\0', 1) |
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359 size = int(size) |
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360 except (ValueError, TypeError): |
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361 raise error.ResponseError( |
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362 _('unexpected response from remote server:'), l) |
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363 if repo.ui.debugflag: |
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364 repo.ui.debug('adding %s (%s)\n' % |
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365 (name, util.bytecount(size))) |
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366 # for backwards compat, name was partially encoded |
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367 path = store.decodedir(name) |
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368 with repo.svfs(path, 'w', backgroundclose=True) as ofp: |
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369 for chunk in util.filechunkiter(fp, limit=size): |
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370 handled_bytes += len(chunk) |
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371 repo.ui.progress(_('clone'), handled_bytes, |
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372 total=bytecount, unit=_('bytes')) |
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373 ofp.write(chunk) |
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374 |
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375 # force @filecache properties to be reloaded from |
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376 # streamclone-ed file at next access |
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377 repo.invalidate(clearfilecache=True) |
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378 |
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379 elapsed = util.timer() - start |
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380 if elapsed <= 0: |
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381 elapsed = 0.001 |
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382 repo.ui.progress(_('clone'), None) |
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383 repo.ui.status(_('transferred %s in %.1f seconds (%s/sec)\n') % |
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384 (util.bytecount(bytecount), elapsed, |
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385 util.bytecount(bytecount / elapsed))) |
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386 |
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387 def readbundle1header(fp): |
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388 compression = fp.read(2) |
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389 if compression != 'UN': |
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390 raise error.Abort(_('only uncompressed stream clone bundles are ' |
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391 'supported; got %s') % compression) |
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392 |
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393 filecount, bytecount = struct.unpack('>QQ', fp.read(16)) |
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394 requireslen = struct.unpack('>H', fp.read(2))[0] |
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395 requires = fp.read(requireslen) |
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396 |
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397 if not requires.endswith('\0'): |
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398 raise error.Abort(_('malformed stream clone bundle: ' |
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399 'requirements not properly encoded')) |
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400 |
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401 requirements = set(requires.rstrip('\0').split(',')) |
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402 |
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403 return filecount, bytecount, requirements |
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404 |
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405 def applybundlev1(repo, fp): |
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406 """Apply the content from a stream clone bundle version 1. |
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407 |
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408 We assume the 4 byte header has been read and validated and the file handle |
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409 is at the 2 byte compression identifier. |
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410 """ |
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411 if len(repo): |
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412 raise error.Abort(_('cannot apply stream clone bundle on non-empty ' |
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413 'repo')) |
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414 |
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415 filecount, bytecount, requirements = readbundle1header(fp) |
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416 missingreqs = requirements - repo.supportedformats |
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417 if missingreqs: |
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418 raise error.Abort(_('unable to apply stream clone: ' |
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419 'unsupported format: %s') % |
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420 ', '.join(sorted(missingreqs))) |
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421 |
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422 consumev1(repo, fp, filecount, bytecount) |
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423 |
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424 class streamcloneapplier(object): |
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425 """Class to manage applying streaming clone bundles. |
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426 |
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427 We need to wrap ``applybundlev1()`` in a dedicated type to enable bundle |
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428 readers to perform bundle type-specific functionality. |
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429 """ |
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430 def __init__(self, fh): |
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431 self._fh = fh |
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432 |
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433 def apply(self, repo): |
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434 return applybundlev1(repo, self._fh) |
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435 |
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436 # type of file to stream |
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437 _fileappend = 0 # append only file |
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438 _filefull = 1 # full snapshot file |
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439 |
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440 # Source of the file |
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441 _srcstore = 's' # store (svfs) |
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442 _srccache = 'c' # cache (cache) |
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443 |
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444 # This is it's own function so extensions can override it. |
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445 def _walkstreamfullstorefiles(repo): |
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446 """list snapshot file from the store""" |
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447 fnames = [] |
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448 if not repo.publishing(): |
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449 fnames.append('phaseroots') |
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450 return fnames |
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451 |
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452 def _filterfull(entry, copy, vfsmap): |
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453 """actually copy the snapshot files""" |
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454 src, name, ftype, data = entry |
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455 if ftype != _filefull: |
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456 return entry |
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457 return (src, name, ftype, copy(vfsmap[src].join(name))) |
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458 |
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459 @contextlib.contextmanager |
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460 def maketempcopies(): |
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461 """return a function to temporary copy file""" |
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462 files = [] |
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463 try: |
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464 def copy(src): |
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465 fd, dst = tempfile.mkstemp() |
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466 os.close(fd) |
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467 files.append(dst) |
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468 util.copyfiles(src, dst, hardlink=True) |
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469 return dst |
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470 yield copy |
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471 finally: |
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472 for tmp in files: |
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473 util.tryunlink(tmp) |
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474 |
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475 def _makemap(repo): |
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476 """make a (src -> vfs) map for the repo""" |
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477 vfsmap = { |
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478 _srcstore: repo.svfs, |
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479 _srccache: repo.cachevfs, |
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480 } |
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481 # we keep repo.vfs out of the on purpose, ther are too many danger there |
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482 # (eg: .hg/hgrc) |
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483 assert repo.vfs not in vfsmap.values() |
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484 |
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485 return vfsmap |
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486 |
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487 def _emit2(repo, entries, totalfilesize): |
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488 """actually emit the stream bundle""" |
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489 vfsmap = _makemap(repo) |
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490 progress = repo.ui.progress |
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491 progress(_('bundle'), 0, total=totalfilesize, unit=_('bytes')) |
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492 with maketempcopies() as copy: |
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493 try: |
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494 # copy is delayed until we are in the try |
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495 entries = [_filterfull(e, copy, vfsmap) for e in entries] |
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496 yield None # this release the lock on the repository |
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497 seen = 0 |
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498 |
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499 for src, name, ftype, data in entries: |
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500 vfs = vfsmap[src] |
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501 yield src |
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502 yield util.uvarintencode(len(name)) |
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503 if ftype == _fileappend: |
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504 fp = vfs(name) |
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505 size = data |
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506 elif ftype == _filefull: |
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507 fp = open(data, 'rb') |
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508 size = util.fstat(fp).st_size |
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509 try: |
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510 yield util.uvarintencode(size) |
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511 yield name |
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512 if size <= 65536: |
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513 chunks = (fp.read(size),) |
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514 else: |
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515 chunks = util.filechunkiter(fp, limit=size) |
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516 for chunk in chunks: |
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517 seen += len(chunk) |
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518 progress(_('bundle'), seen, total=totalfilesize, |
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519 unit=_('bytes')) |
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520 yield chunk |
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521 finally: |
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522 fp.close() |
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523 finally: |
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524 progress(_('bundle'), None) |
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525 |
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526 def generatev2(repo): |
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527 """Emit content for version 2 of a streaming clone. |
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528 |
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529 the data stream consists the following entries: |
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530 1) A char representing the file destination (eg: store or cache) |
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531 2) A varint containing the length of the filename |
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532 3) A varint containing the length of file data |
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533 4) N bytes containing the filename (the internal, store-agnostic form) |
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534 5) N bytes containing the file data |
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535 |
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536 Returns a 3-tuple of (file count, file size, data iterator). |
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537 """ |
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538 |
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539 with repo.lock(): |
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540 |
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541 entries = [] |
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542 totalfilesize = 0 |
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543 |
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544 repo.ui.debug('scanning\n') |
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545 for name, ename, size in _walkstreamfiles(repo): |
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546 if size: |
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547 entries.append((_srcstore, name, _fileappend, size)) |
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548 totalfilesize += size |
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549 for name in _walkstreamfullstorefiles(repo): |
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550 if repo.svfs.exists(name): |
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551 totalfilesize += repo.svfs.lstat(name).st_size |
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552 entries.append((_srcstore, name, _filefull, None)) |
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553 for name in cacheutil.cachetocopy(repo): |
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554 if repo.cachevfs.exists(name): |
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555 totalfilesize += repo.cachevfs.lstat(name).st_size |
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556 entries.append((_srccache, name, _filefull, None)) |
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557 |
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558 chunks = _emit2(repo, entries, totalfilesize) |
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559 first = next(chunks) |
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560 assert first is None |
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561 |
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562 return len(entries), totalfilesize, chunks |
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563 |
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564 @contextlib.contextmanager |
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565 def nested(*ctxs): |
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566 with warnings.catch_warnings(): |
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567 # For some reason, Python decided 'nested' was deprecated without |
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568 # replacement. They officially advertised for filtering the deprecation |
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569 # warning for people who actually need the feature. |
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570 warnings.filterwarnings("ignore",category=DeprecationWarning) |
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571 with contextlib.nested(*ctxs): |
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572 yield |
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573 |
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574 def consumev2(repo, fp, filecount, filesize): |
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575 """Apply the contents from a version 2 streaming clone. |
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576 |
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577 Data is read from an object that only needs to provide a ``read(size)`` |
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578 method. |
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579 """ |
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580 with repo.lock(): |
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581 repo.ui.status(_('%d files to transfer, %s of data\n') % |
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582 (filecount, util.bytecount(filesize))) |
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583 |
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584 start = util.timer() |
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585 handledbytes = 0 |
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586 progress = repo.ui.progress |
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587 |
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588 progress(_('clone'), handledbytes, total=filesize, unit=_('bytes')) |
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589 |
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590 vfsmap = _makemap(repo) |
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591 |
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592 with repo.transaction('clone'): |
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593 ctxs = (vfs.backgroundclosing(repo.ui) |
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594 for vfs in vfsmap.values()) |
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595 with nested(*ctxs): |
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596 for i in range(filecount): |
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597 src = util.readexactly(fp, 1) |
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598 vfs = vfsmap[src] |
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599 namelen = util.uvarintdecodestream(fp) |
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600 datalen = util.uvarintdecodestream(fp) |
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601 |
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602 name = util.readexactly(fp, namelen) |
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603 |
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604 if repo.ui.debugflag: |
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605 repo.ui.debug('adding [%s] %s (%s)\n' % |
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606 (src, name, util.bytecount(datalen))) |
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607 |
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608 with vfs(name, 'w') as ofp: |
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609 for chunk in util.filechunkiter(fp, limit=datalen): |
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610 handledbytes += len(chunk) |
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611 progress(_('clone'), handledbytes, total=filesize, |
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612 unit=_('bytes')) |
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613 ofp.write(chunk) |
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614 |
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615 # force @filecache properties to be reloaded from |
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616 # streamclone-ed file at next access |
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617 repo.invalidate(clearfilecache=True) |
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618 |
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619 elapsed = util.timer() - start |
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620 if elapsed <= 0: |
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621 elapsed = 0.001 |
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622 progress(_('clone'), None) |
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623 repo.ui.status(_('transferred %s in %.1f seconds (%s/sec)\n') % |
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624 (util.bytecount(handledbytes), elapsed, |
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625 util.bytecount(handledbytes / elapsed))) |
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626 |
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627 def applybundlev2(repo, fp, filecount, filesize, requirements): |
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628 missingreqs = [r for r in requirements if r not in repo.supported] |
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629 if missingreqs: |
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630 raise error.Abort(_('unable to apply stream clone: ' |
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631 'unsupported format: %s') % |
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632 ', '.join(sorted(missingreqs))) |
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633 |
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634 consumev2(repo, fp, filecount, filesize) |
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635 |
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636 # new requirements = old non-format requirements + |
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637 # new format-related remote requirements |
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638 # requirements from the streamed-in repository |
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639 repo.requirements = set(requirements) | ( |
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640 repo.requirements - repo.supportedformats) |
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641 repo._applyopenerreqs() |
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642 repo._writerequirements() |