Mercurial > hg
annotate mercurial/ancestor.py @ 21022:52e9e63f1495
run-tests: test result shows when a failed test could not start a server
Failing to start a server happens regularly, at least on windows buildbot.
Such a failure often has nothing to do with the test, but with the environment.
But half the test output can change because some data is missing. Therefore this
is worth an extended error message.
Detect the server failure in the diff output because it is most reliable
there. Checking the output only does not show if the server failure was
expected.
Old failure message when server start failed:
Failed test-serve.t: output changed
New message:
Failed test-serve.t: serve failed and output changed
author | Simon Heimberg <simohe@besonet.ch> |
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date | Mon, 25 Nov 2013 22:00:46 +0100 |
parents | 231ccc08670c |
children | 64911a12dc28 |
rev | line source |
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Abstract ancestor algorithm into generic function
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1 # ancestor.py - generic DAG ancestor algorithm for mercurial |
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2 # |
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3 # Copyright 2006 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 import heapq |
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9 import util |
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10 from node import nullrev |
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11 |
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12 def ancestors(pfunc, *orignodes): |
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13 """ |
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14 Returns the common ancestors of a and b that are furthest from a |
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15 root (as measured by longest path). |
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16 |
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17 pfunc must return a list of parent vertices for a given vertex. |
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18 """ |
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19 if not isinstance(orignodes, set): |
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20 orignodes = set(orignodes) |
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21 if nullrev in orignodes: |
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22 return set() |
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23 if len(orignodes) <= 1: |
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24 return orignodes |
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25 |
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26 def candidates(nodes): |
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27 allseen = (1 << len(nodes)) - 1 |
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28 seen = [0] * (max(nodes) + 1) |
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29 for i, n in enumerate(nodes): |
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30 seen[n] = 1 << i |
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31 poison = 1 << (i + 1) |
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32 |
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33 gca = set() |
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34 interesting = len(nodes) |
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35 nv = len(seen) - 1 |
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36 while nv >= 0 and interesting: |
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37 v = nv |
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38 nv -= 1 |
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39 if not seen[v]: |
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40 continue |
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41 sv = seen[v] |
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42 if sv < poison: |
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43 interesting -= 1 |
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44 if sv == allseen: |
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45 gca.add(v) |
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46 sv |= poison |
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47 if v in nodes: |
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48 # history is linear |
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49 return set([v]) |
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50 if sv < poison: |
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51 for p in pfunc(v): |
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52 sp = seen[p] |
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53 if p == nullrev: |
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54 continue |
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55 if sp == 0: |
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56 seen[p] = sv |
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57 interesting += 1 |
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58 elif sp != sv: |
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59 seen[p] |= sv |
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60 else: |
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61 for p in pfunc(v): |
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62 if p == nullrev: |
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63 continue |
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64 sp = seen[p] |
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65 if sp and sp < poison: |
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66 interesting -= 1 |
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67 seen[p] = sv |
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68 return gca |
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69 |
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70 def deepest(nodes): |
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71 interesting = {} |
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72 count = max(nodes) + 1 |
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73 depth = [0] * count |
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74 seen = [0] * count |
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75 mapping = [] |
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76 for (i, n) in enumerate(sorted(nodes)): |
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77 depth[n] = 1 |
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78 b = 1 << i |
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79 seen[n] = b |
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80 interesting[b] = 1 |
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81 mapping.append((b, n)) |
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82 nv = count - 1 |
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83 while nv >= 0 and len(interesting) > 1: |
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84 v = nv |
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85 nv -= 1 |
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86 dv = depth[v] |
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87 if dv == 0: |
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88 continue |
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89 sv = seen[v] |
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90 for p in pfunc(v): |
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91 if p == nullrev: |
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92 continue |
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93 dp = depth[p] |
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94 nsp = sp = seen[p] |
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95 if dp <= dv: |
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96 depth[p] = dv + 1 |
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97 if sp != sv: |
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98 interesting[sv] += 1 |
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99 nsp = seen[p] = sv |
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100 if sp: |
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101 interesting[sp] -= 1 |
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102 if interesting[sp] == 0: |
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103 del interesting[sp] |
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104 elif dv == dp - 1: |
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105 nsp = sp | sv |
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106 if nsp == sp: |
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107 continue |
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108 seen[p] = nsp |
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109 interesting.setdefault(nsp, 0) |
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110 interesting[nsp] += 1 |
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111 interesting[sp] -= 1 |
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112 if interesting[sp] == 0: |
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113 del interesting[sp] |
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114 interesting[sv] -= 1 |
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115 if interesting[sv] == 0: |
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116 del interesting[sv] |
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117 |
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118 if len(interesting) != 1: |
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119 return [] |
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120 |
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121 k = 0 |
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122 for i in interesting: |
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123 k |= i |
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124 return set(n for (i, n) in mapping if k & i) |
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125 |
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126 gca = candidates(orignodes) |
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127 |
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128 if len(gca) <= 1: |
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129 return gca |
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130 return deepest(gca) |
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131 |
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132 def missingancestors(revs, bases, pfunc): |
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133 """Return all the ancestors of revs that are not ancestors of bases. |
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134 |
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135 This may include elements from revs. |
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136 |
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137 Equivalent to the revset (::revs - ::bases). Revs are returned in |
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138 revision number order, which is a topological order. |
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139 |
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140 revs and bases should both be iterables. pfunc must return a list of |
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141 parent revs for a given revs. |
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142 """ |
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143 |
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144 revsvisit = set(revs) |
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145 basesvisit = set(bases) |
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146 if not revsvisit: |
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147 return [] |
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148 if not basesvisit: |
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149 basesvisit.add(nullrev) |
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150 start = max(max(revsvisit), max(basesvisit)) |
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151 bothvisit = revsvisit.intersection(basesvisit) |
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152 revsvisit.difference_update(bothvisit) |
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153 basesvisit.difference_update(bothvisit) |
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154 # At this point, we hold the invariants that: |
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155 # - revsvisit is the set of nodes we know are an ancestor of at least one |
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156 # of the nodes in revs |
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157 # - basesvisit is the same for bases |
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158 # - bothvisit is the set of nodes we know are ancestors of at least one of |
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159 # the nodes in revs and one of the nodes in bases |
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160 # - a node may be in none or one, but not more, of revsvisit, basesvisit |
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161 # and bothvisit at any given time |
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162 # Now we walk down in reverse topo order, adding parents of nodes already |
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163 # visited to the sets while maintaining the invariants. When a node is |
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164 # found in both revsvisit and basesvisit, it is removed from them and |
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165 # added to bothvisit instead. When revsvisit becomes empty, there are no |
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166 # more ancestors of revs that aren't also ancestors of bases, so exit. |
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167 |
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168 missing = [] |
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169 for curr in xrange(start, nullrev, -1): |
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170 if not revsvisit: |
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171 break |
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172 |
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173 if curr in bothvisit: |
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174 bothvisit.remove(curr) |
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175 # curr's parents might have made it into revsvisit or basesvisit |
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176 # through another path |
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177 for p in pfunc(curr): |
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178 revsvisit.discard(p) |
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179 basesvisit.discard(p) |
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180 bothvisit.add(p) |
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181 continue |
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182 |
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183 # curr will never be in both revsvisit and basesvisit, since if it |
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184 # were it'd have been pushed to bothvisit |
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185 if curr in revsvisit: |
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186 missing.append(curr) |
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187 thisvisit = revsvisit |
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188 othervisit = basesvisit |
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189 elif curr in basesvisit: |
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190 thisvisit = basesvisit |
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191 othervisit = revsvisit |
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192 else: |
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193 # not an ancestor of revs or bases: ignore |
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194 continue |
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195 |
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196 thisvisit.remove(curr) |
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197 for p in pfunc(curr): |
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198 if p == nullrev: |
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199 pass |
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200 elif p in othervisit or p in bothvisit: |
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201 # p is implicitly in thisvisit. This means p is or should be |
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202 # in bothvisit |
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203 revsvisit.discard(p) |
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204 basesvisit.discard(p) |
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205 bothvisit.add(p) |
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206 else: |
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207 # visit later |
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208 thisvisit.add(p) |
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209 |
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210 missing.reverse() |
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211 return missing |
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212 |
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213 class lazyancestors(object): |
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214 def __init__(self, cl, revs, stoprev=0, inclusive=False): |
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215 """Create a new object generating ancestors for the given revs. Does |
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216 not generate revs lower than stoprev. |
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217 |
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218 This is computed lazily starting from revs. The object supports |
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219 iteration and membership. |
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220 |
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221 cl should be a changelog and revs should be an iterable. inclusive is |
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222 a boolean that indicates whether revs should be included. Revs lower |
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223 than stoprev will not be generated. |
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224 |
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225 Result does not include the null revision.""" |
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226 self._parentrevs = cl.parentrevs |
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227 self._initrevs = revs |
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228 self._stoprev = stoprev |
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229 self._inclusive = inclusive |
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230 |
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231 # Initialize data structures for __contains__. |
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232 # For __contains__, we use a heap rather than a deque because |
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233 # (a) it minimizes the number of parentrevs calls made |
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234 # (b) it makes the loop termination condition obvious |
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235 # Python's heap is a min-heap. Multiply all values by -1 to convert it |
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236 # into a max-heap. |
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237 self._containsvisit = [-rev for rev in revs] |
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238 heapq.heapify(self._containsvisit) |
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239 if inclusive: |
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240 self._containsseen = set(revs) |
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241 else: |
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242 self._containsseen = set() |
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243 |
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244 def __iter__(self): |
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245 """Generate the ancestors of _initrevs in reverse topological order. |
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246 |
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247 If inclusive is False, yield a sequence of revision numbers starting |
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248 with the parents of each revision in revs, i.e., each revision is *not* |
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249 considered an ancestor of itself. Results are in breadth-first order: |
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250 parents of each rev in revs, then parents of those, etc. |
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251 |
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252 If inclusive is True, yield all the revs first (ignoring stoprev), |
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253 then yield all the ancestors of revs as when inclusive is False. |
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254 If an element in revs is an ancestor of a different rev it is not |
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255 yielded again.""" |
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256 seen = set() |
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257 revs = self._initrevs |
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258 if self._inclusive: |
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259 for rev in revs: |
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260 yield rev |
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261 seen.update(revs) |
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262 |
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263 parentrevs = self._parentrevs |
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264 stoprev = self._stoprev |
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265 visit = util.deque(revs) |
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266 |
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267 while visit: |
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268 for parent in parentrevs(visit.popleft()): |
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269 if parent >= stoprev and parent not in seen: |
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270 visit.append(parent) |
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271 seen.add(parent) |
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272 yield parent |
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273 |
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274 def __contains__(self, target): |
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275 """Test whether target is an ancestor of self._initrevs.""" |
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276 # Trying to do both __iter__ and __contains__ using the same visit |
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277 # heap and seen set is complex enough that it slows down both. Keep |
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278 # them separate. |
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279 seen = self._containsseen |
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280 if target in seen: |
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281 return True |
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282 |
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283 parentrevs = self._parentrevs |
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284 visit = self._containsvisit |
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285 stoprev = self._stoprev |
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286 heappop = heapq.heappop |
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287 heappush = heapq.heappush |
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288 |
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289 targetseen = False |
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290 |
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291 while visit and -visit[0] > target and not targetseen: |
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292 for parent in parentrevs(-heappop(visit)): |
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293 if parent < stoprev or parent in seen: |
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294 continue |
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295 # We need to make sure we push all parents into the heap so |
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296 # that we leave it in a consistent state for future calls. |
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297 heappush(visit, -parent) |
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298 seen.add(parent) |
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299 if parent == target: |
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300 targetseen = True |
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301 |
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302 return targetseen |