Mercurial > hg
annotate mercurial/treediscovery.py @ 35935:00b9e26d727b
sshpeer: establish SSH connection before class instantiation
We want to move the handshake to before peers are created so
we can instantiate a different peer class depending on the
results of the handshake. This necessitates moving the SSH
process invocation to outside the peer class.
As part of the code move, some variables were renamed for
clarity. util.popen4() returns stdin, stdout, and stderr in
their typical file descriptor order. However, stdin and stdout
were being mapped to "pipeo" and "pipei" respectively. "o"
for "stdin" and "i" for "stdout" is a bit confusing. Although
it does make sense for "output" and "input" from the perspective
of the client. But in the context of the new function, it makes
sense to refer to these as their file descriptor names.
In addition, the last use of self._path disappeared, so we stop
setting that attribute and we can delete the redundant URL
parsing necessary to set it.
Differential Revision: https://phab.mercurial-scm.org/D2031
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Mon, 05 Feb 2018 14:05:59 -0800 |
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1 # discovery.py - protocol changeset discovery functions |
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2 # |
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3 # Copyright 2010 Matt Mackall <mpm@selenic.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
10263 | 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 collections |
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11 |
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12 from .i18n import _ |
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13 from .node import ( |
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14 nullid, |
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15 short, |
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16 ) |
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17 from . import ( |
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18 error, |
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19 ) |
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20 |
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21 def findcommonincoming(repo, remote, heads=None, force=False): |
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22 """Return a tuple (common, fetch, heads) used to identify the common |
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23 subset of nodes between repo and remote. |
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24 |
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25 "common" is a list of (at least) the heads of the common subset. |
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26 "fetch" is a list of roots of the nodes that would be incoming, to be |
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27 supplied to changegroupsubset. |
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28 "heads" is either the supplied heads, or else the remote's heads. |
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29 """ |
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31 knownnode = repo.changelog.hasnode |
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32 search = [] |
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33 fetch = set() |
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34 seen = set() |
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35 seenbranch = set() |
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36 base = set() |
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37 |
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38 if not heads: |
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39 heads = remote.heads() |
343 | 40 |
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41 if repo.changelog.tip() == nullid: |
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42 base.add(nullid) |
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43 if heads != [nullid]: |
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44 return [nullid], [nullid], list(heads) |
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45 return [nullid], [], heads |
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46 |
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47 # assume we're closer to the tip than the root |
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48 # and start by examining the heads |
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49 repo.ui.status(_("searching for changes\n")) |
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50 |
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51 unknown = [] |
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52 for h in heads: |
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53 if not knownnode(h): |
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54 unknown.append(h) |
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55 else: |
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56 base.add(h) |
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57 |
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58 if not unknown: |
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59 return list(base), [], list(heads) |
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60 |
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61 req = set(unknown) |
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62 reqcnt = 0 |
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63 |
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64 # search through remote branches |
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65 # a 'branch' here is a linear segment of history, with four parts: |
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66 # head, root, first parent, second parent |
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67 # (a branch always has two parents (or none) by definition) |
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68 unknown = collections.deque(remote.branches(unknown)) |
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69 while unknown: |
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70 r = [] |
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71 while unknown: |
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72 n = unknown.popleft() |
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73 if n[0] in seen: |
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74 continue |
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75 |
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76 repo.ui.debug("examining %s:%s\n" |
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77 % (short(n[0]), short(n[1]))) |
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78 if n[0] == nullid: # found the end of the branch |
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79 pass |
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80 elif n in seenbranch: |
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81 repo.ui.debug("branch already found\n") |
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82 continue |
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83 elif n[1] and knownnode(n[1]): # do we know the base? |
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84 repo.ui.debug("found incomplete branch %s:%s\n" |
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85 % (short(n[0]), short(n[1]))) |
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86 search.append(n[0:2]) # schedule branch range for scanning |
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87 seenbranch.add(n) |
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88 else: |
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89 if n[1] not in seen and n[1] not in fetch: |
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90 if knownnode(n[2]) and knownnode(n[3]): |
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91 repo.ui.debug("found new changeset %s\n" % |
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92 short(n[1])) |
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93 fetch.add(n[1]) # earliest unknown |
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94 for p in n[2:4]: |
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95 if knownnode(p): |
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96 base.add(p) # latest known |
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97 |
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98 for p in n[2:4]: |
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99 if p not in req and not knownnode(p): |
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100 r.append(p) |
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101 req.add(p) |
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102 seen.add(n[0]) |
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103 |
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104 if r: |
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105 reqcnt += 1 |
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106 repo.ui.progress(_('searching'), reqcnt, unit=_('queries')) |
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107 repo.ui.debug("request %d: %s\n" % |
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108 (reqcnt, " ".join(map(short, r)))) |
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109 for p in xrange(0, len(r), 10): |
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110 for b in remote.branches(r[p:p + 10]): |
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111 repo.ui.debug("received %s:%s\n" % |
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112 (short(b[0]), short(b[1]))) |
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113 unknown.append(b) |
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114 |
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115 # do binary search on the branches we found |
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116 while search: |
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117 newsearch = [] |
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118 reqcnt += 1 |
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119 repo.ui.progress(_('searching'), reqcnt, unit=_('queries')) |
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120 for n, l in zip(search, remote.between(search)): |
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121 l.append(n[1]) |
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122 p = n[0] |
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123 f = 1 |
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124 for i in l: |
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125 repo.ui.debug("narrowing %d:%d %s\n" % (f, len(l), short(i))) |
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126 if knownnode(i): |
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127 if f <= 2: |
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128 repo.ui.debug("found new branch changeset %s\n" % |
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129 short(p)) |
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130 fetch.add(p) |
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131 base.add(i) |
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132 else: |
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133 repo.ui.debug("narrowed branch search to %s:%s\n" |
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134 % (short(p), short(i))) |
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135 newsearch.append((p, i)) |
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136 break |
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137 p, f = i, f * 2 |
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138 search = newsearch |
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139 |
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140 # sanity check our fetch list |
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141 for f in fetch: |
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142 if knownnode(f): |
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143 raise error.RepoError(_("already have changeset ") |
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144 + short(f[:4])) |
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145 |
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146 base = list(base) |
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147 if base == [nullid]: |
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148 if force: |
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149 repo.ui.warn(_("warning: repository is unrelated\n")) |
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150 else: |
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151 raise error.Abort(_("repository is unrelated")) |
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152 |
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153 repo.ui.debug("found new changesets starting at " + |
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154 " ".join([short(f) for f in fetch]) + "\n") |
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155 |
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156 repo.ui.progress(_('searching'), None) |
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157 repo.ui.debug("%d total queries\n" % reqcnt) |
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158 |
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159 return base, list(fetch), heads |