Mercurial > hg
annotate mercurial/treediscovery.py @ 23324:69f86b937035
cmdserver: protect pipe server streams against corruption caused by direct io
Because pipe-mode server uses stdio as IPC channel, other modules should not
touch stdio directly and use ui instead. However, this strategy is brittle
because several Python functions read and write stdio implicitly.
print 'hello' # should use ui.write()
# => ch = 'h', size = 1701604463 'ello', data = '\n'
This patch adds protection for such mistakes. Both stdio files and low-level
file descriptors are redirected to /dev/null while command server uses them.
author | Yuya Nishihara <yuya@tcha.org> |
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date | Sat, 15 Nov 2014 13:50:43 +0900 |
parents | d2704c48f417 |
children | 0ca8410ea345 |
rev | line source |
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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 knownnode = repo.changelog.hasnode |
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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 not knownnode(h): |
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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 knownnode(n[1]): # 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 knownnode(n[2]) and knownnode(n[3]): |
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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 knownnode(p): |
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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 not knownnode(p): |
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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 knownnode(i): |
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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 knownnode(f): |
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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 |