Mercurial > hg
annotate mercurial/discovery.py @ 14184:4ab6e2d597cc
fix errors reported by pyflakes test
author | Sune Foldager <cryo@cyanite.org> |
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date | Wed, 04 May 2011 19:27:55 +0200 |
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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 |
3891 | 9 from i18n import _ |
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10 import util, setdiscovery, treediscovery |
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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, anyincoming, 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 "anyincoming" is testable as a boolean indicating if any nodes are missing |
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18 locally. If remote does not support getbundle, this actually is a list of |
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19 roots of the nodes that would be incoming, to be supplied to |
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20 changegroupsubset. No code except for pull should be relying on this fact |
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21 any longer. |
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22 "heads" is either the supplied heads, or else the remote's heads. |
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23 |
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24 If you pass heads and they are all known locally, the reponse lists justs |
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25 these heads in "common" and in "heads". |
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26 """ |
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27 |
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28 if not remote.capable('getbundle'): |
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29 return treediscovery.findcommonincoming(repo, remote, heads, force) |
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30 |
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31 if heads: |
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32 allknown = True |
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33 nm = repo.changelog.nodemap |
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34 for h in heads: |
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35 if nm.get(h) is None: |
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36 allknown = False |
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37 break |
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38 if allknown: |
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39 return (heads, False, heads) |
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40 |
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41 res = setdiscovery.findcommonheads(repo.ui, repo, remote, |
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42 abortwhenunrelated=not force) |
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43 common, anyinc, srvheads = res |
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44 return (list(common), anyinc, heads or list(srvheads)) |
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45 |
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46 def prepush(repo, remote, force, revs, newbranch): |
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47 '''Analyze the local and remote repositories and determine which |
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48 changesets need to be pushed to the remote. Return value depends |
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49 on circumstances: |
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50 |
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51 If we are not going to push anything, return a tuple (None, |
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52 outgoing) where outgoing is 0 if there are no outgoing |
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53 changesets and 1 if there are, but we refuse to push them |
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54 (e.g. would create new remote heads). |
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55 |
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56 Otherwise, return a tuple (changegroup, remoteheads), where |
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57 changegroup is a readable file-like object whose read() returns |
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58 successive changegroup chunks ready to be sent over the wire and |
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59 remoteheads is the list of remote heads.''' |
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60 common, inc, remoteheads = findcommonincoming(repo, remote, force=force) |
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61 |
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62 cl = repo.changelog |
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63 outg = cl.findmissing(common, revs) |
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64 |
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65 if not outg: |
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66 repo.ui.status(_("no changes found\n")) |
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67 return None, 1 |
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68 |
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69 if not force and remoteheads != [nullid]: |
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70 if remote.capable('branchmap'): |
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71 # Check for each named branch if we're creating new remote heads. |
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72 # To be a remote head after push, node must be either: |
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73 # - unknown locally |
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74 # - a local outgoing head descended from update |
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75 # - a remote head that's known locally and not |
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76 # ancestral to an outgoing head |
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77 |
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78 # 1. Create set of branches involved in the push. |
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79 branches = set(repo[n].branch() for n in outg) |
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80 |
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81 # 2. Check for new branches on the remote. |
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82 remotemap = remote.branchmap() |
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83 newbranches = branches - set(remotemap) |
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84 if newbranches and not newbranch: # new branch requires --new-branch |
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85 branchnames = ', '.join(sorted(newbranches)) |
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86 raise util.Abort(_("push creates new remote branches: %s!") |
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87 % branchnames, |
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88 hint=_("use 'hg push --new-branch' to create" |
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89 " new remote branches")) |
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90 branches.difference_update(newbranches) |
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91 |
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92 # 3. Construct the initial oldmap and newmap dicts. |
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93 # They contain information about the remote heads before and |
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94 # after the push, respectively. |
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95 # Heads not found locally are not included in either dict, |
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96 # since they won't be affected by the push. |
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97 # unsynced contains all branches with incoming changesets. |
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98 oldmap = {} |
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99 newmap = {} |
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100 unsynced = set() |
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101 for branch in branches: |
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102 remotebrheads = remotemap[branch] |
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103 prunedbrheads = [h for h in remotebrheads if h in cl.nodemap] |
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104 oldmap[branch] = prunedbrheads |
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105 newmap[branch] = list(prunedbrheads) |
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106 if len(remotebrheads) > len(prunedbrheads): |
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107 unsynced.add(branch) |
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108 |
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109 # 4. Update newmap with outgoing changes. |
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110 # This will possibly add new heads and remove existing ones. |
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111 ctxgen = (repo[n] for n in outg) |
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112 repo._updatebranchcache(newmap, ctxgen) |
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113 |
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114 else: |
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115 # 1-4b. old servers: Check for new topological heads. |
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116 # Construct {old,new}map with branch = None (topological branch). |
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117 # (code based on _updatebranchcache) |
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118 oldheads = set(h for h in remoteheads if h in cl.nodemap) |
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119 newheads = oldheads.union(outg) |
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120 if len(newheads) > 1: |
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121 for latest in reversed(outg): |
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122 if latest not in newheads: |
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123 continue |
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124 minhrev = min(cl.rev(h) for h in newheads) |
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125 reachable = cl.reachable(latest, cl.node(minhrev)) |
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126 reachable.remove(latest) |
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127 newheads.difference_update(reachable) |
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128 branches = set([None]) |
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129 newmap = {None: newheads} |
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130 oldmap = {None: oldheads} |
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131 unsynced = inc and branches or set() |
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132 |
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133 # 5. Check for new heads. |
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134 # If there are more heads after the push than before, a suitable |
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135 # error message, depending on unsynced status, is displayed. |
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136 error = None |
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137 for branch in branches: |
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138 newhs = set(newmap[branch]) |
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139 oldhs = set(oldmap[branch]) |
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140 if len(newhs) > len(oldhs): |
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141 if error is None: |
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142 if branch: |
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143 error = _("push creates new remote heads " |
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144 "on branch '%s'!") % branch |
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145 else: |
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146 error = _("push creates new remote heads!") |
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147 if branch in unsynced: |
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148 hint = _("you should pull and merge or " |
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149 "use push -f to force") |
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150 else: |
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151 hint = _("did you forget to merge? " |
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152 "use push -f to force") |
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153 if branch: |
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154 repo.ui.debug("new remote heads on branch '%s'\n" % branch) |
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155 for h in (newhs - oldhs): |
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156 repo.ui.debug("new remote head %s\n" % short(h)) |
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157 if error: |
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158 raise util.Abort(error, hint=hint) |
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159 |
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160 # 6. Check for unsynced changes on involved branches. |
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161 if unsynced: |
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162 repo.ui.warn(_("note: unsynced remote changes!\n")) |
515 | 163 |
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164 if revs is None: |
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165 # use the fast path, no race possible on push |
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166 cg = repo._changegroup(outg, 'push') |
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167 else: |
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168 cg = repo.getbundle('push', heads=revs, common=common) |
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169 return cg, remoteheads |