Mercurial > hg
annotate mercurial/bundlerepo.py @ 26379:39d643252b9f
revlog: use existing file handle when reading during _addrevision
_addrevision() may need to read from revlogs as part of computing
deltas. Previously, we would flush existing file handles and open
a new, short-lived file handle to perform the reading.
If we have an existing file handle, it seems logical to reuse it
for reading instead of opening a new file handle. This patch
makes that the new behavior.
After this patch, revlog files are only reopened when adding
revisions if the revlog is switched from inline to non-inline.
On Linux when unbundling a bundle of the mozilla-central repo, this
patch has the following impact on system call counts:
Call Before After Delta
write 827,639 673,390 -154,249
open 700,103 684,089 -16,014
read 74,489 74,489 0
fstat 493,924 461,896 -32,028
close 249,131 233,117 -16,014
stat 242,001 242,001 0
lstat 18,676 18,676 0
lseek 20,268 20,268 0
ioctl 14,652 13,173 -1,479
TOTAL 3,180,758 2,930,679 -250,079
It's worth noting that many of the open() calls fail due to missing
files. That's why there are many more open() calls than close().
Despite the significant system call reduction, this change does not
seem to have a significant performance impact on Linux.
On Windows 10 (not a VM, on a SSD), this patch appears to reduce
unbundle time for mozilla-central from ~960s to ~920s. This isn't
as significant as I was hoping. But a decrease it is nonetheless.
Still, Windows unbundle performance is still >2x slower than Linux.
Despite the lack of significant gains, fewer system calls is fewer
system calls. If nothing else, this will narrow the focus of potential
areas to optimize in the future.
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Sun, 27 Sep 2015 16:08:18 -0700 |
parents | 5aaf51c14fea |
children | 1f0e78f8f55f |
rev | line source |
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1 # bundlerepo.py - repository class for viewing uncompressed bundles |
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2 # |
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3 # Copyright 2006, 2007 Benoit Boissinot <bboissin@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 |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
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8 """Repository class for viewing uncompressed bundles. |
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9 |
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10 This provides a read-only repository interface to bundles as if they |
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11 were part of the actual repository. |
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12 """ |
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13 |
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14 from __future__ import absolute_import |
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15 |
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16 import os |
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17 import shutil |
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18 import tempfile |
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19 |
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20 from .i18n import _ |
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21 from .node import nullid |
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22 |
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23 from . import ( |
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24 bundle2, |
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25 changegroup, |
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26 changelog, |
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27 cmdutil, |
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28 discovery, |
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29 error, |
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30 exchange, |
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31 filelog, |
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32 localrepo, |
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33 manifest, |
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34 mdiff, |
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35 pathutil, |
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36 phases, |
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37 revlog, |
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38 scmutil, |
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39 util, |
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40 ) |
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41 |
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42 class bundlerevlog(revlog.revlog): |
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43 def __init__(self, opener, indexfile, bundle, linkmapper): |
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44 # How it works: |
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45 # To retrieve a revision, we need to know the offset of the revision in |
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46 # the bundle (an unbundle object). We store this offset in the index |
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47 # (start). The base of the delta is stored in the base field. |
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48 # |
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49 # To differentiate a rev in the bundle from a rev in the revlog, we |
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50 # check revision against repotiprev. |
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51 opener = scmutil.readonlyvfs(opener) |
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52 revlog.revlog.__init__(self, opener, indexfile) |
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53 self.bundle = bundle |
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54 n = len(self) |
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55 self.repotiprev = n - 1 |
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56 chain = None |
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57 self.bundlerevs = set() # used by 'bundle()' revset expression |
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58 while True: |
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59 chunkdata = bundle.deltachunk(chain) |
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60 if not chunkdata: |
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61 break |
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62 node = chunkdata['node'] |
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63 p1 = chunkdata['p1'] |
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64 p2 = chunkdata['p2'] |
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65 cs = chunkdata['cs'] |
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66 deltabase = chunkdata['deltabase'] |
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67 delta = chunkdata['delta'] |
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68 |
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69 size = len(delta) |
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70 start = bundle.tell() - size |
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71 |
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72 link = linkmapper(cs) |
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73 if node in self.nodemap: |
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74 # this can happen if two branches make the same change |
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75 chain = node |
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76 self.bundlerevs.add(self.nodemap[node]) |
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77 continue |
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78 |
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79 for p in (p1, p2): |
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80 if p not in self.nodemap: |
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81 raise error.LookupError(p, self.indexfile, |
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83 |
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84 if deltabase not in self.nodemap: |
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85 raise LookupError(deltabase, self.indexfile, |
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86 _('unknown delta base')) |
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87 |
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88 baserev = self.rev(deltabase) |
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89 # start, size, full unc. size, base (unused), link, p1, p2, node |
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90 e = (revlog.offset_type(start, 0), size, -1, baserev, link, |
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91 self.rev(p1), self.rev(p2), node) |
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92 self.index.insert(-1, e) |
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93 self.nodemap[node] = n |
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94 self.bundlerevs.add(n) |
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95 chain = node |
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96 n += 1 |
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97 |
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98 def _chunk(self, rev): |
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99 # Warning: in case of bundle, the diff is against what we stored as |
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100 # delta base, not against rev - 1 |
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101 # XXX: could use some caching |
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102 if rev <= self.repotiprev: |
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103 return revlog.revlog._chunk(self, rev) |
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104 self.bundle.seek(self.start(rev)) |
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105 return self.bundle.read(self.length(rev)) |
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106 |
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107 def revdiff(self, rev1, rev2): |
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108 """return or calculate a delta between two revisions""" |
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109 if rev1 > self.repotiprev and rev2 > self.repotiprev: |
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110 # hot path for bundle |
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111 revb = self.index[rev2][3] |
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112 if revb == rev1: |
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113 return self._chunk(rev2) |
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114 elif rev1 <= self.repotiprev and rev2 <= self.repotiprev: |
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115 return revlog.revlog.revdiff(self, rev1, rev2) |
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116 |
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117 return mdiff.textdiff(self.revision(self.node(rev1)), |
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118 self.revision(self.node(rev2))) |
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119 |
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120 def revision(self, nodeorrev): |
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121 """return an uncompressed revision of a given node or revision |
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122 number. |
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123 """ |
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124 if isinstance(nodeorrev, int): |
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125 rev = nodeorrev |
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126 node = self.node(rev) |
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127 else: |
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128 node = nodeorrev |
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129 rev = self.rev(node) |
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130 |
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131 if node == nullid: |
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132 return "" |
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133 |
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134 text = None |
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135 chain = [] |
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136 iterrev = rev |
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137 # reconstruct the revision if it is from a changegroup |
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138 while iterrev > self.repotiprev: |
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139 if self._cache and self._cache[1] == iterrev: |
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141 break |
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142 chain.append(iterrev) |
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143 iterrev = self.index[iterrev][3] |
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144 if text is None: |
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145 text = self.baserevision(iterrev) |
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146 |
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147 while chain: |
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148 delta = self._chunk(chain.pop()) |
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149 text = mdiff.patches(text, [delta]) |
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150 |
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151 self._checkhash(text, node, rev) |
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152 self._cache = (node, rev, text) |
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153 return text |
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154 |
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155 def baserevision(self, nodeorrev): |
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156 # Revlog subclasses may override 'revision' method to modify format of |
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157 # content retrieved from revlog. To use bundlerevlog with such class one |
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158 # needs to override 'baserevision' and make more specific call here. |
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159 return revlog.revlog.revision(self, nodeorrev) |
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160 |
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161 def addrevision(self, text, transaction, link, p1=None, p2=None, d=None): |
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162 raise NotImplementedError |
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163 def addgroup(self, revs, linkmapper, transaction): |
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164 raise NotImplementedError |
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165 def strip(self, rev, minlink): |
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166 raise NotImplementedError |
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167 def checksize(self): |
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168 raise NotImplementedError |
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169 |
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170 class bundlechangelog(bundlerevlog, changelog.changelog): |
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171 def __init__(self, opener, bundle): |
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172 changelog.changelog.__init__(self, opener) |
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173 linkmapper = lambda x: x |
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174 bundlerevlog.__init__(self, opener, self.indexfile, bundle, |
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175 linkmapper) |
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176 |
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177 def baserevision(self, nodeorrev): |
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178 # Although changelog doesn't override 'revision' method, some extensions |
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179 # may replace this class with another that does. Same story with |
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180 # manifest and filelog classes. |
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181 |
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182 # This bypasses filtering on changelog.node() and rev() because we need |
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183 # revision text of the bundle base even if it is hidden. |
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184 oldfilter = self.filteredrevs |
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185 try: |
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186 self.filteredrevs = () |
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187 return changelog.changelog.revision(self, nodeorrev) |
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188 finally: |
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189 self.filteredrevs = oldfilter |
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190 |
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191 class bundlemanifest(bundlerevlog, manifest.manifest): |
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192 def __init__(self, opener, bundle, linkmapper): |
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193 manifest.manifest.__init__(self, opener) |
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194 bundlerevlog.__init__(self, opener, self.indexfile, bundle, |
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195 linkmapper) |
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196 |
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197 def baserevision(self, nodeorrev): |
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198 return manifest.manifest.revision(self, nodeorrev) |
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199 |
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200 class bundlefilelog(bundlerevlog, filelog.filelog): |
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201 def __init__(self, opener, path, bundle, linkmapper): |
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202 filelog.filelog.__init__(self, opener, path) |
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203 bundlerevlog.__init__(self, opener, self.indexfile, bundle, |
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204 linkmapper) |
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205 |
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206 def baserevision(self, nodeorrev): |
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207 return filelog.filelog.revision(self, nodeorrev) |
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208 |
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209 class bundlepeer(localrepo.localpeer): |
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210 def canpush(self): |
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211 return False |
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212 |
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213 class bundlephasecache(phases.phasecache): |
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214 def __init__(self, *args, **kwargs): |
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215 super(bundlephasecache, self).__init__(*args, **kwargs) |
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216 if util.safehasattr(self, 'opener'): |
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217 self.opener = scmutil.readonlyvfs(self.opener) |
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218 |
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219 def write(self): |
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220 raise NotImplementedError |
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221 |
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222 def _write(self, fp): |
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223 raise NotImplementedError |
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224 |
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225 def _updateroots(self, phase, newroots, tr): |
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226 self.phaseroots[phase] = newroots |
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227 self.invalidate() |
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228 self.dirty = True |
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229 |
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230 class bundlerepository(localrepo.localrepository): |
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231 def __init__(self, ui, path, bundlename): |
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232 self._tempparent = None |
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233 try: |
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234 localrepo.localrepository.__init__(self, ui, path) |
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236 self._tempparent = tempfile.mkdtemp() |
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237 localrepo.instance(ui, self._tempparent, 1) |
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238 localrepo.localrepository.__init__(self, ui, self._tempparent) |
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239 self.ui.setconfig('phases', 'publish', False, 'bundlerepo') |
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240 |
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241 if path: |
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242 self._url = 'bundle:' + util.expandpath(path) + '+' + bundlename |
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243 else: |
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244 self._url = 'bundle:' + bundlename |
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245 |
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246 self.tempfile = None |
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247 f = util.posixfile(bundlename, "rb") |
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248 self.bundlefile = self.bundle = exchange.readbundle(ui, f, bundlename) |
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249 if self.bundle.compressed(): |
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250 fdtemp, temp = self.vfs.mkstemp(prefix="hg-bundle-", |
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251 suffix=".hg10un") |
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252 self.tempfile = temp |
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253 fptemp = os.fdopen(fdtemp, 'wb') |
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254 |
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255 try: |
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256 fptemp.write("HG10UN") |
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257 while True: |
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258 chunk = self.bundle.read(2**18) |
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259 if not chunk: |
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260 break |
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261 fptemp.write(chunk) |
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262 finally: |
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263 fptemp.close() |
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264 |
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265 f = self.vfs.open(self.tempfile, mode="rb") |
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266 self.bundlefile = self.bundle = exchange.readbundle(ui, f, |
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267 bundlename, |
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268 self.vfs) |
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269 |
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270 if isinstance(self.bundle, bundle2.unbundle20): |
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271 cgparts = [part for part in self.bundle.iterparts() |
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272 if (part.type == 'changegroup') |
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273 and (part.params.get('version', '01') |
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274 in changegroup.packermap)] |
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275 |
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276 if not cgparts: |
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277 raise util.Abort('No changegroups found') |
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278 version = cgparts[0].params.get('version', '01') |
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279 cgparts = [p for p in cgparts |
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280 if p.params.get('version', '01') == version] |
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281 if len(cgparts) > 1: |
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282 raise NotImplementedError("Can't process multiple changegroups") |
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283 part = cgparts[0] |
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284 |
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285 part.seek(0) |
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286 self.bundle = changegroup.packermap[version][1](part, 'UN') |
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287 |
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288 # dict with the mapping 'filename' -> position in the bundle |
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289 self.bundlefilespos = {} |
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291 self.firstnewrev = self.changelog.repotiprev + 1 |
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292 phases.retractboundary(self, None, phases.draft, |
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293 [ctx.node() for ctx in self[self.firstnewrev:]]) |
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294 |
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295 @localrepo.unfilteredpropertycache |
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296 def _phasecache(self): |
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297 return bundlephasecache(self, self._phasedefaults) |
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298 |
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299 @localrepo.unfilteredpropertycache |
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300 def changelog(self): |
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301 # consume the header if it exists |
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302 self.bundle.changelogheader() |
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303 c = bundlechangelog(self.svfs, self.bundle) |
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304 self.manstart = self.bundle.tell() |
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305 return c |
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306 |
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307 @localrepo.unfilteredpropertycache |
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308 def manifest(self): |
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309 self.bundle.seek(self.manstart) |
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310 # consume the header if it exists |
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311 self.bundle.manifestheader() |
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312 m = bundlemanifest(self.svfs, self.bundle, self.changelog.rev) |
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313 self.filestart = self.bundle.tell() |
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314 return m |
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315 |
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316 @localrepo.unfilteredpropertycache |
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317 def manstart(self): |
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318 self.changelog |
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319 return self.manstart |
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320 |
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321 @localrepo.unfilteredpropertycache |
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322 def filestart(self): |
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323 self.manifest |
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324 return self.filestart |
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325 |
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326 def url(self): |
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327 return self._url |
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328 |
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329 def file(self, f): |
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331 self.bundle.seek(self.filestart) |
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332 while True: |
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333 chunkdata = self.bundle.filelogheader() |
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334 if not chunkdata: |
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336 fname = chunkdata['filename'] |
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337 self.bundlefilespos[fname] = self.bundle.tell() |
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338 while True: |
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339 c = self.bundle.deltachunk(None) |
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340 if not c: |
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|
341 break |
5262 | 342 |
1942
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343 if f in self.bundlefilespos: |
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344 self.bundle.seek(self.bundlefilespos[f]) |
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345 return bundlefilelog(self.svfs, f, self.bundle, self.changelog.rev) |
1942
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346 else: |
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347 return filelog.filelog(self.svfs, f) |
1942
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348 |
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349 def close(self): |
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350 """Close assigned bundle file immediately.""" |
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351 self.bundlefile.close() |
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352 if self.tempfile is not None: |
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353 self.vfs.unlink(self.tempfile) |
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354 if self._tempparent: |
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355 shutil.rmtree(self._tempparent, True) |
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356 |
6315 | 357 def cancopy(self): |
358 return False | |
359 | |
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360 def peer(self): |
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361 return bundlepeer(self) |
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362 |
7435
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363 def getcwd(self): |
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364 return os.getcwd() # always outside the repo |
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365 |
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366 |
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367 def instance(ui, path, create): |
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368 if create: |
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369 raise util.Abort(_('cannot create new bundle repository')) |
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370 # internal config: bundle.mainreporoot |
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Fix income/pull with bundle and -R (issue 820).
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371 parentpath = ui.config("bundle", "mainreporoot", "") |
16042
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372 if not parentpath: |
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373 # try to find the correct path to the working directory repo |
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374 parentpath = cmdutil.findrepo(os.getcwd()) |
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375 if parentpath is None: |
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376 parentpath = '' |
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377 if parentpath: |
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378 # Try to make the full path relative so we get a nice, short URL. |
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379 # In particular, we don't want temp dir names in test outputs. |
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380 cwd = os.getcwd() |
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381 if parentpath == cwd: |
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382 parentpath = '' |
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383 else: |
24834
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384 cwd = pathutil.normasprefix(cwd) |
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385 if parentpath.startswith(cwd): |
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|
386 parentpath = parentpath[len(cwd):] |
14076
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url: move URL parsing functions into util to improve startup time
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387 u = util.url(path) |
13826
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url: refactor util.drop_scheme() and hg.localpath() into url.localpath()
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|
388 path = u.localpath() |
e574207e3bcd
url: refactor util.drop_scheme() and hg.localpath() into url.localpath()
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|
389 if u.scheme == 'bundle': |
2740
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390 s = path.split("+", 1) |
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391 if len(s) == 1: |
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392 repopath, bundlename = parentpath, s[0] |
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393 else: |
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394 repopath, bundlename = s |
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395 else: |
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Fix income/pull with bundle and -R (issue 820).
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396 repopath, bundlename = parentpath, path |
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397 return bundlerepository(ui, repopath, bundlename) |
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398 |
23633
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changeset
|
399 class bundletransactionmanager(object): |
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400 def transaction(self): |
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401 return None |
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402 |
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403 def close(self): |
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404 raise NotImplementedError |
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|
405 |
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|
406 def release(self): |
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|
407 raise NotImplementedError |
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|
408 |
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409 def getremotechanges(ui, repo, other, onlyheads=None, bundlename=None, |
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discovery: drop findoutgoing and simplify findcommonincoming's api
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changeset
|
410 force=False): |
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|
411 '''obtains a bundle of changes incoming from other |
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|
412 |
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|
413 "onlyheads" restricts the returned changes to those reachable from the |
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|
414 specified heads. |
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changeset
|
415 "bundlename", if given, stores the bundle to this file path permanently; |
14190
8aab5a82685f
bundlerepo: fix closing and docstring of getremotechanges
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changeset
|
416 otherwise it's stored to a temp file and gets deleted again when you call |
8aab5a82685f
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|
417 the returned "cleanupfn". |
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418 "force" indicates whether to proceed on unrelated repos. |
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|
419 |
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420 Returns a tuple (local, csets, cleanupfn): |
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421 |
16683 | 422 "local" is a local repo from which to obtain the actual incoming |
423 changesets; it is a bundlerepo for the obtained bundle when the | |
424 original "other" is remote. | |
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425 "csets" lists the incoming changeset node ids. |
16683 | 426 "cleanupfn" must be called without arguments when you're done processing |
427 the changes; it closes both the original "other" and the one returned | |
428 here. | |
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429 ''' |
16683 | 430 tmp = discovery.findcommonincoming(repo, other, heads=onlyheads, |
431 force=force) | |
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432 common, incoming, rheads = tmp |
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|
433 if not incoming: |
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changeset
|
434 try: |
15091
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bundlerepo: add argument check before unlink
Sune Foldager <cryo@cyanite.org>
parents:
14494
diff
changeset
|
435 if bundlename: |
21694
c08a22bfa16e
bundlerepo: backout dbf292f65b09
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changeset
|
436 os.unlink(bundlename) |
14004
97ed99d1f419
eliminate various naked except clauses
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|
437 except OSError: |
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|
438 pass |
18138
8ab0640c3090
bundlerepo: don't return the peer without bundlerepo from getremotechanges
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changeset
|
439 return repo, [], other.close |
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440 |
22182
510cafe72004
incoming: don't request heads that already are common
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|
441 commonset = set(common) |
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442 rheads = [x for x in rheads if x not in commonset] |
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443 |
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444 bundle = None |
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|
445 bundlerepo = None |
17191
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peer: introduce peer methods to prepare for peer classes
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|
446 localrepo = other.local() |
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447 if bundlename or not localrepo: |
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448 # create a bundle (uncompressed if other repo is not local) |
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449 |
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450 if other.capable('getbundle'): |
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451 cg = other.getbundle('incoming', common=common, heads=rheads) |
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452 elif onlyheads is None and not other.capable('changegroupsubset'): |
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453 # compat with older servers when pulling all remote heads |
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454 cg = other.changegroup(incoming, "incoming") |
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455 rheads = None |
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456 else: |
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457 cg = other.changegroupsubset(incoming, rheads, 'incoming') |
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|
458 if localrepo: |
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459 bundletype = "HG10BZ" |
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460 else: |
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461 bundletype = "HG10UN" |
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462 fname = bundle = changegroup.writebundle(ui, cg, bundlename, bundletype) |
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463 # keep written bundle? |
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464 if bundlename: |
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465 bundle = None |
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466 if not localrepo: |
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467 # use the created uncompressed bundlerepo |
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468 localrepo = bundlerepo = bundlerepository(repo.baseui, repo.root, |
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469 fname) |
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470 # this repo contains local and other now, so filter out local again |
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471 common = repo.heads() |
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472 if localrepo: |
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473 # Part of common may be remotely filtered |
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474 # So use an unfiltered version |
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475 # The discovery process probably need cleanup to avoid that |
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476 localrepo = localrepo.unfiltered() |
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477 |
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478 csets = localrepo.changelog.findmissing(common, rheads) |
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479 |
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480 if bundlerepo: |
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481 reponodes = [ctx.node() for ctx in bundlerepo[bundlerepo.firstnewrev:]] |
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482 remotephases = other.listkeys('phases') |
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483 |
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484 pullop = exchange.pulloperation(bundlerepo, other, heads=reponodes) |
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485 pullop.trmanager = bundletransactionmanager() |
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486 exchange._pullapplyphases(pullop, remotephases) |
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487 |
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488 def cleanup(): |
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489 if bundlerepo: |
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490 bundlerepo.close() |
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491 if bundle: |
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492 os.unlink(bundle) |
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493 other.close() |
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494 |
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495 return (localrepo, csets, cleanup) |