dirstate: ignore symlinks when fs cannot handle them (issue1888)
When the filesystem cannot handle the executable bit, we currently
ignore it completely when looking for modified files. Similarly, it is
impossible to set or clear the bit when the filesystem ignores it.
This patch makes Mercurial treat symbolic links the same way.
Symlinks are a little different since they manifest themselves as
small files containing a filename (the symlink target). On Windows,
these files show up as regular files, and on Linux and Mac they show
up as real symlinks.
Issue1888 presents a case where the symlink files are better ignored
from the Windows side. A Linux client creates symlinks in a working
copy which is shared over a network between Linux and Windows clients.
The Samba server is helpful and defererences the symlink when the
Windows client looks at it. This means that Mercurial on the Windows
side sees file content instead of a file name in the symlink, and
hence flags the link as modified. Ignoring the change would be much
more helpful, similarly to how Mercurial does not report any changes
when executable bits are ignored in a checkout on Windows.
An initial checkout of a symbolic link on a file system that cannot
handle symbolic links will still result in a regular file containing
the target file name as its content. Sharing such a checkout with a
Linux client will not turn the file into a symlink automatically, but
'hg revert' can fix that. After the revert, the Windows client will
see the correct file content (provided by the Samba server when it
follows the link on the Linux side) and otherwise ignore the change.
Running 'hg perfstatus' 10 times gives these results:
Before: After:
min: 0.544703 min: 0.546549
med: 0.547592 med: 0.548881
avg: 0.549146 avg: 0.548549
max: 0.564112 max: 0.551504
The median time is increased about 0.24%.
adding primes.py
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<div class="parity0 source"><a href="#l1" id="l1"> 1</a> <span class="c">#!/usr/bin/env python</span></div>
<div class="parity1 source"><a href="#l2" id="l2"> 2</a> </div>
<div class="parity0 source"><a href="#l3" id="l3"> 3</a> <span class="sd">"""Fun with generators. Corresponding Haskell implementation:</span></div>
<div class="parity1 source"><a href="#l4" id="l4"> 4</a> </div>
<div class="parity0 source"><a href="#l5" id="l5"> 5</a> <span class="sd">primes = 2 : sieve [3, 5..]</span></div>
<div class="parity1 source"><a href="#l6" id="l6"> 6</a> <span class="sd"> where sieve (p:ns) = p : sieve [n | n <- ns, mod n p /= 0]</span></div>
<div class="parity0 source"><a href="#l7" id="l7"> 7</a> <span class="sd">"""</span></div>
<div class="parity1 source"><a href="#l8" id="l8"> 8</a> </div>
<div class="parity0 source"><a href="#l9" id="l9"> 9</a> <span class="kn">from</span> <span class="nn">itertools</span> <span class="kn">import</span> <span class="n">dropwhile</span><span class="p">,</span> <span class="n">ifilter</span><span class="p">,</span> <span class="n">islice</span><span class="p">,</span> <span class="n">count</span><span class="p">,</span> <span class="n">chain</span></div>
<div class="parity1 source"><a href="#l10" id="l10"> 10</a> </div>
<div class="parity0 source"><a href="#l11" id="l11"> 11</a> <span class="kn">def</span> <span class="nf">primes</span><span class="p">():</span></div>
<div class="parity1 source"><a href="#l12" id="l12"> 12</a> <span class="sd">"""Generate all primes."""</span></div>
<div class="parity0 source"><a href="#l13" id="l13"> 13</a> <span class="kn">def</span> <span class="nf">sieve</span><span class="p">(</span><span class="n">ns</span><span class="p">):</span></div>
<div class="parity1 source"><a href="#l14" id="l14"> 14</a> <span class="n">p</span> <span class="o">=</span> <span class="n">ns</span><span class="o">.</span><span class="n">next</span><span class="p">()</span></div>
<div class="parity0 source"><a href="#l15" id="l15"> 15</a> <span class="c"># It is important to yield *here* in order to stop the</span></div>
<div class="parity1 source"><a href="#l16" id="l16"> 16</a> <span class="c"># infinite recursion.</span></div>
<div class="parity0 source"><a href="#l17" id="l17"> 17</a> <span class="kn">yield</span> <span class="n">p</span></div>
<div class="parity1 source"><a href="#l18" id="l18"> 18</a> <span class="n">ns</span> <span class="o">=</span> <span class="n">ifilter</span><span class="p">(</span><span class="kn">lambda</span> <span class="n">n</span><span class="p">:</span> <span class="n">n</span> <span class="o">%</span> <span class="n">p</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">,</span> <span class="n">ns</span><span class="p">)</span></div>
<div class="parity0 source"><a href="#l19" id="l19"> 19</a> <span class="kn">for</span> <span class="n">n</span> <span class="ow">in</span> <span class="n">sieve</span><span class="p">(</span><span class="n">ns</span><span class="p">):</span></div>
<div class="parity1 source"><a href="#l20" id="l20"> 20</a> <span class="kn">yield</span> <span class="n">n</span></div>
<div class="parity0 source"><a href="#l21" id="l21"> 21</a> </div>
<div class="parity1 source"><a href="#l22" id="l22"> 22</a> <span class="n">odds</span> <span class="o">=</span> <span class="n">ifilter</span><span class="p">(</span><span class="kn">lambda</span> <span class="n">i</span><span class="p">:</span> <span class="n">i</span> <span class="o">%</span> <span class="mi">2</span> <span class="o">==</span> <span class="mi">1</span><span class="p">,</span> <span class="n">count</span><span class="p">())</span></div>
<div class="parity0 source"><a href="#l23" id="l23"> 23</a> <span class="kn">return</span> <span class="n">chain</span><span class="p">([</span><span class="mi">2</span><span class="p">],</span> <span class="n">sieve</span><span class="p">(</span><span class="n">dropwhile</span><span class="p">(</span><span class="kn">lambda</span> <span class="n">n</span><span class="p">:</span> <span class="n">n</span> <span class="o"><</span> <span class="mi">3</span><span class="p">,</span> <span class="n">odds</span><span class="p">)))</span></div>
<div class="parity1 source"><a href="#l24" id="l24"> 24</a> </div>
<div class="parity0 source"><a href="#l25" id="l25"> 25</a> <span class="kn">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">"__main__"</span><span class="p">:</span></div>
<div class="parity1 source"><a href="#l26" id="l26"> 26</a> <span class="kn">import</span> <span class="nn">sys</span></div>
<div class="parity0 source"><a href="#l27" id="l27"> 27</a> <span class="kn">try</span><span class="p">:</span></div>
<div class="parity1 source"><a href="#l28" id="l28"> 28</a> <span class="n">n</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">sys</span><span class="o">.</span><span class="n">argv</span><span class="p">[</span><span class="mi">1</span><span class="p">])</span></div>
<div class="parity0 source"><a href="#l29" id="l29"> 29</a> <span class="kn">except</span> <span class="p">(</span><span class="ne">ValueError</span><span class="p">,</span> <span class="ne">IndexError</span><span class="p">):</span></div>
<div class="parity1 source"><a href="#l30" id="l30"> 30</a> <span class="n">n</span> <span class="o">=</span> <span class="mi">10</span></div>
<div class="parity0 source"><a href="#l31" id="l31"> 31</a> <span class="n">p</span> <span class="o">=</span> <span class="n">primes</span><span class="p">()</span></div>
<div class="parity1 source"><a href="#l32" id="l32"> 32</a> <span class="kn">print</span> <span class="s">"The first </span><span class="si">%d</span><span class="s"> primes: </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">n</span><span class="p">,</span> <span class="nb">list</span><span class="p">(</span><span class="n">islice</span><span class="p">(</span><span class="n">p</span><span class="p">,</span> <span class="n">n</span><span class="p">)))</span></div>
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<h3>annotate primes.py @ 0:853dcd4de2a6</h3>
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<td class="source"><a href="#l1" id="l1"> 1</a> <span class="c">#!/usr/bin/env python</span></td>
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<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#2"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l2" id="l2"> 2</a> </td>
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<a href="/annotate/853dcd4de2a6/primes.py#3"
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<td class="source"><a href="#l3" id="l3"> 3</a> <span class="sd">"""Fun with generators. Corresponding Haskell implementation:</span></td>
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<a href="/annotate/853dcd4de2a6/primes.py#4"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l4" id="l4"> 4</a> </td>
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<a href="/annotate/853dcd4de2a6/primes.py#5"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l5" id="l5"> 5</a> <span class="sd">primes = 2 : sieve [3, 5..]</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#6"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l6" id="l6"> 6</a> <span class="sd"> where sieve (p:ns) = p : sieve [n | n <- ns, mod n p /= 0]</span></td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#7"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l7" id="l7"> 7</a> <span class="sd">"""</span></td>
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<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#8"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l8" id="l8"> 8</a> </td>
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<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#9"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l9" id="l9"> 9</a> <span class="kn">from</span> <span class="nn">itertools</span> <span class="kn">import</span> <span class="n">dropwhile</span><span class="p">,</span> <span class="n">ifilter</span><span class="p">,</span> <span class="n">islice</span><span class="p">,</span> <span class="n">count</span><span class="p">,</span> <span class="n">chain</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#10"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l10" id="l10"> 10</a> </td>
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<a href="/annotate/853dcd4de2a6/primes.py#11"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l11" id="l11"> 11</a> <span class="kn">def</span> <span class="nf">primes</span><span class="p">():</span></td>
</tr>
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<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#12"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l12" id="l12"> 12</a> <span class="sd">"""Generate all primes."""</span></td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#13"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l13" id="l13"> 13</a> <span class="kn">def</span> <span class="nf">sieve</span><span class="p">(</span><span class="n">ns</span><span class="p">):</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#14"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l14" id="l14"> 14</a> <span class="n">p</span> <span class="o">=</span> <span class="n">ns</span><span class="o">.</span><span class="n">next</span><span class="p">()</span></td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#15"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l15" id="l15"> 15</a> <span class="c"># It is important to yield *here* in order to stop the</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#16"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l16" id="l16"> 16</a> <span class="c"># infinite recursion.</span></td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#17"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l17" id="l17"> 17</a> <span class="kn">yield</span> <span class="n">p</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#18"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l18" id="l18"> 18</a> <span class="n">ns</span> <span class="o">=</span> <span class="n">ifilter</span><span class="p">(</span><span class="kn">lambda</span> <span class="n">n</span><span class="p">:</span> <span class="n">n</span> <span class="o">%</span> <span class="n">p</span> <span class="o">!=</span> <span class="mf">0</span><span class="p">,</span> <span class="n">ns</span><span class="p">)</span></td>
</tr>
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<a href="/annotate/853dcd4de2a6/primes.py#19"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l19" id="l19"> 19</a> <span class="kn">for</span> <span class="n">n</span> <span class="ow">in</span> <span class="n">sieve</span><span class="p">(</span><span class="n">ns</span><span class="p">):</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#20"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l20" id="l20"> 20</a> <span class="kn">yield</span> <span class="n">n</span></td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#21"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l21" id="l21"> 21</a> </td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#22"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l22" id="l22"> 22</a> <span class="n">odds</span> <span class="o">=</span> <span class="n">ifilter</span><span class="p">(</span><span class="kn">lambda</span> <span class="n">i</span><span class="p">:</span> <span class="n">i</span> <span class="o">%</span> <span class="mf">2</span> <span class="o">==</span> <span class="mf">1</span><span class="p">,</span> <span class="n">count</span><span class="p">())</span></td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#23"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l23" id="l23"> 23</a> <span class="kn">return</span> <span class="n">chain</span><span class="p">([</span><span class="mf">2</span><span class="p">],</span> <span class="n">sieve</span><span class="p">(</span><span class="n">dropwhile</span><span class="p">(</span><span class="kn">lambda</span> <span class="n">n</span><span class="p">:</span> <span class="n">n</span> <span class="o"><</span> <span class="mf">3</span><span class="p">,</span> <span class="n">odds</span><span class="p">)))</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#24"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l24" id="l24"> 24</a> </td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#25"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l25" id="l25"> 25</a> <span class="kn">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">"__main__"</span><span class="p">:</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#26"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l26" id="l26"> 26</a> <span class="kn">import</span> <span class="nn">sys</span></td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#27"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l27" id="l27"> 27</a> <span class="kn">try</span><span class="p">:</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#28"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l28" id="l28"> 28</a> <span class="n">n</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">sys</span><span class="o">.</span><span class="n">argv</span><span class="p">[</span><span class="mf">1</span><span class="p">])</span></td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#29"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l29" id="l29"> 29</a> <span class="kn">except</span> <span class="p">(</span><span class="ne">ValueError</span><span class="p">,</span> <span class="ne">IndexError</span><span class="p">):</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#30"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l30" id="l30"> 30</a> <span class="n">n</span> <span class="o">=</span> <span class="mf">10</span></td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#31"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l31" id="l31"> 31</a> <span class="n">p</span> <span class="o">=</span> <span class="n">primes</span><span class="p">()</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#32"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l32" id="l32"> 32</a> <span class="kn">print</span> <span class="s">"The first </span><span class="si">%d</span><span class="s"> primes: </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">n</span><span class="p">,</span> <span class="nb">list</span><span class="p">(</span><span class="n">islice</span><span class="p">(</span><span class="n">p</span><span class="p">,</span> <span class="n">n</span><span class="p">)))</span></td>
</tr>
</table>
</div>
</div>
</div>
</body>
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adding eucjp.txt
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<div class="parity0 source"><a href="#l1" id="l1"> 1</a> ??</div>
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