Mercurial > hg
annotate mercurial/treediscovery.py @ 19785:1d2ca307bf22
merge with stable
author | Matt Mackall <mpm@selenic.com> |
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date | Mon, 23 Sep 2013 13:26:11 -0700 |
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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 node import nullid, short |
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10 import util, error |
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11 |
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12 def findcommonincoming(repo, remote, heads=None, force=False): |
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13 """Return a tuple (common, fetch, heads) used to identify the common |
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14 subset of nodes between repo and remote. |
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15 |
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16 "common" is a list of (at least) the heads of the common subset. |
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17 "fetch" is a list of roots of the nodes that would be incoming, to be |
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18 supplied to changegroupsubset. |
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19 "heads" is either the supplied heads, or else the remote's heads. |
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20 """ |
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21 |
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22 m = repo.changelog.nodemap |
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23 search = [] |
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24 fetch = set() |
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25 seen = set() |
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26 seenbranch = set() |
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27 base = set() |
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28 |
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29 if not heads: |
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30 heads = remote.heads() |
343 | 31 |
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32 if repo.changelog.tip() == nullid: |
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33 base.add(nullid) |
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34 if heads != [nullid]: |
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35 return [nullid], [nullid], list(heads) |
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36 return [nullid], [], heads |
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37 |
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38 # assume we're closer to the tip than the root |
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39 # and start by examining the heads |
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40 repo.ui.status(_("searching for changes\n")) |
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41 |
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42 unknown = [] |
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43 for h in heads: |
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44 if h not in m: |
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45 unknown.append(h) |
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46 else: |
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47 base.add(h) |
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48 |
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49 if not unknown: |
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50 return list(base), [], list(heads) |
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51 |
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52 req = set(unknown) |
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53 reqcnt = 0 |
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54 |
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55 # search through remote branches |
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56 # a 'branch' here is a linear segment of history, with four parts: |
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57 # head, root, first parent, second parent |
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58 # (a branch always has two parents (or none) by definition) |
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59 unknown = util.deque(remote.branches(unknown)) |
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60 while unknown: |
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61 r = [] |
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62 while unknown: |
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63 n = unknown.popleft() |
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64 if n[0] in seen: |
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65 continue |
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66 |
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67 repo.ui.debug("examining %s:%s\n" |
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68 % (short(n[0]), short(n[1]))) |
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69 if n[0] == nullid: # found the end of the branch |
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70 pass |
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71 elif n in seenbranch: |
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72 repo.ui.debug("branch already found\n") |
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73 continue |
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74 elif n[1] and n[1] in m: # do we know the base? |
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75 repo.ui.debug("found incomplete branch %s:%s\n" |
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76 % (short(n[0]), short(n[1]))) |
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77 search.append(n[0:2]) # schedule branch range for scanning |
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78 seenbranch.add(n) |
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79 else: |
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80 if n[1] not in seen and n[1] not in fetch: |
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81 if n[2] in m and n[3] in m: |
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82 repo.ui.debug("found new changeset %s\n" % |
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83 short(n[1])) |
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84 fetch.add(n[1]) # earliest unknown |
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85 for p in n[2:4]: |
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86 if p in m: |
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87 base.add(p) # latest known |
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88 |
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89 for p in n[2:4]: |
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90 if p not in req and p not in m: |
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91 r.append(p) |
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92 req.add(p) |
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93 seen.add(n[0]) |
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94 |
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95 if r: |
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96 reqcnt += 1 |
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97 repo.ui.progress(_('searching'), reqcnt, unit=_('queries')) |
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98 repo.ui.debug("request %d: %s\n" % |
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99 (reqcnt, " ".join(map(short, r)))) |
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100 for p in xrange(0, len(r), 10): |
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101 for b in remote.branches(r[p:p + 10]): |
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102 repo.ui.debug("received %s:%s\n" % |
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103 (short(b[0]), short(b[1]))) |
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104 unknown.append(b) |
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105 |
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106 # do binary search on the branches we found |
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107 while search: |
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108 newsearch = [] |
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109 reqcnt += 1 |
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110 repo.ui.progress(_('searching'), reqcnt, unit=_('queries')) |
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111 for n, l in zip(search, remote.between(search)): |
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112 l.append(n[1]) |
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113 p = n[0] |
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114 f = 1 |
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115 for i in l: |
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116 repo.ui.debug("narrowing %d:%d %s\n" % (f, len(l), short(i))) |
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117 if i in m: |
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118 if f <= 2: |
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119 repo.ui.debug("found new branch changeset %s\n" % |
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120 short(p)) |
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121 fetch.add(p) |
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122 base.add(i) |
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123 else: |
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124 repo.ui.debug("narrowed branch search to %s:%s\n" |
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125 % (short(p), short(i))) |
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126 newsearch.append((p, i)) |
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127 break |
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128 p, f = i, f * 2 |
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129 search = newsearch |
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130 |
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131 # sanity check our fetch list |
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132 for f in fetch: |
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133 if f in m: |
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134 raise error.RepoError(_("already have changeset ") |
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135 + short(f[:4])) |
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136 |
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137 base = list(base) |
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138 if base == [nullid]: |
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139 if force: |
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140 repo.ui.warn(_("warning: repository is unrelated\n")) |
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141 else: |
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142 raise util.Abort(_("repository is unrelated")) |
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143 |
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144 repo.ui.debug("found new changesets starting at " + |
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145 " ".join([short(f) for f in fetch]) + "\n") |
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146 |
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147 repo.ui.progress(_('searching'), None) |
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148 repo.ui.debug("%d total queries\n" % reqcnt) |
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149 |
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150 return base, list(fetch), heads |