hg: support for auto sharing stores when cloning
Many 3rd party consumers of Mercurial have created wrappers to
essentially perform clone+share as a single operation. This is
especially popular in automated processes like continuous integration
systems. The Jenkins CI software and Mozilla's Firefox release
automation infrastructure have both implemented custom code that
effectively perform clone+share. The common use case here is that
clients want to obtain N>1 checkouts while minimizing disk space and
network requirements. Furthermore, they often don't care that a clone
is an exact mirror of a remote: they are simply looking to obtain
checkouts of specific revisions.
When multiple third parties implement a similar feature, it's a good
sign that the feature is worth adding to the core product. This patch
adds support for an easy-to-use clone+share feature.
The internal "clone" function now accepts options to control auto
sharing during clone. When the auto share mode is active, a store will
be created/updated under the base directory specified and a new
repository pointing to the shared store will be created at the path
specified by the user.
The share extension has grown the ability to pass these options into
the clone command/function.
No command line options for this feature are added because we don't
feel the feature will be popular enough to warrant their existence.
There are two modes for auto share mode. In the default mode, the shared
repo is derived from the first changeset (rev 0) in the remote
repository. This enables related repositories existing at different URLs
to automatically use the same storage. In environments that operate
several repositories (separate repo for branch/head/bookmark or separate
repo per user), this has the potential to drastically reduce storage
and network requirements. In the other mode, the name is derived from the
remote's path/URL.
#require pygments serve
$ cat <<EOF >> $HGRCPATH
> [extensions]
> highlight =
> [web]
> pygments_style = friendly
> EOF
$ hg init test
$ cd test
create random Python file to exercise Pygments
$ cat <<EOF > primes.py
> #!/usr/bin/env python
>
> """Fun with generators. Corresponding Haskell implementation:
>
> primes = 2 : sieve [3, 5..]
> where sieve (p:ns) = p : sieve [n | n <- ns, mod n p /= 0]
> """
>
> from itertools import dropwhile, ifilter, islice, count, chain
>
> def primes():
> """Generate all primes."""
> def sieve(ns):
> p = ns.next()
> # It is important to yield *here* in order to stop the
> # infinite recursion.
> yield p
> ns = ifilter(lambda n: n % p != 0, ns)
> for n in sieve(ns):
> yield n
>
> odds = ifilter(lambda i: i % 2 == 1, count())
> return chain([2], sieve(dropwhile(lambda n: n < 3, odds)))
>
> if __name__ == "__main__":
> import sys
> try:
> n = int(sys.argv[1])
> except (ValueError, IndexError):
> n = 10
> p = primes()
> print "The first %d primes: %s" % (n, list(islice(p, n)))
> EOF
$ hg ci -Ama
adding primes.py
hg serve
$ hg serve -p $HGPORT -d -n test --pid-file=hg.pid -A access.log -E errors.log
$ cat hg.pid >> $DAEMON_PIDS
hgweb filerevision, html
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<pre class="sourcelines stripes4 wrap">
<span id="l1"><span class="c">#!/usr/bin/env python</span></span><a href="#l1"></a>
<span id="l2"></span><a href="#l2"></a>
<span id="l3"><span class="sd">"""Fun with generators. Corresponding Haskell implementation:</span></span><a href="#l3"></a>
<span id="l4"></span><a href="#l4"></a>
<span id="l5"><span class="sd">primes = 2 : sieve [3, 5..]</span></span><a href="#l5"></a>
<span id="l6"><span class="sd"> where sieve (p:ns) = p : sieve [n | n <- ns, mod n p /= 0]</span></span><a href="#l6"></a>
<span id="l7"><span class="sd">"""</span></span><a href="#l7"></a>
<span id="l8"></span><a href="#l8"></a>
<span id="l9"><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></span><a href="#l9"></a>
<span id="l10"></span><a href="#l10"></a>
<span id="l11"><span class="kn">def</span> <span class="nf">primes</span><span class="p">():</span></span><a href="#l11"></a>
<span id="l12"> <span class="sd">"""Generate all primes."""</span></span><a href="#l12"></a>
<span id="l13"> <span class="kn">def</span> <span class="nf">sieve</span><span class="p">(</span><span class="n">ns</span><span class="p">):</span></span><a href="#l13"></a>
<span id="l14"> <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></span><a href="#l14"></a>
<span id="l15"> <span class="c"># It is important to yield *here* in order to stop the</span></span><a href="#l15"></a>
<span id="l16"> <span class="c"># infinite recursion.</span></span><a href="#l16"></a>
<span id="l17"> <span class="kn">yield</span> <span class="n">p</span></span><a href="#l17"></a>
<span id="l18"> <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></span><a href="#l18"></a>
<span id="l19"> <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></span><a href="#l19"></a>
<span id="l20"> <span class="kn">yield</span> <span class="n">n</span></span><a href="#l20"></a>
<span id="l21"></span><a href="#l21"></a>
<span id="l22"> <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></span><a href="#l22"></a>
<span id="l23"> <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></span><a href="#l23"></a>
<span id="l24"></span><a href="#l24"></a>
<span id="l25"><span class="kn">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">"__main__"</span><span class="p">:</span></span><a href="#l25"></a>
<span id="l26"> <span class="kn">import</span> <span class="nn">sys</span></span><a href="#l26"></a>
<span id="l27"> <span class="kn">try</span><span class="p">:</span></span><a href="#l27"></a>
<span id="l28"> <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></span><a href="#l28"></a>
<span id="l29"> <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></span><a href="#l29"></a>
<span id="l30"> <span class="n">n</span> <span class="o">=</span> <span class="mi">10</span></span><a href="#l30"></a>
<span id="l31"> <span class="n">p</span> <span class="o">=</span> <span class="n">primes</span><span class="p">()</span></span><a href="#l31"></a>
<span id="l32"> <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></span><a href="#l32"></a></pre>
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<td class="source"><a href="#l1"> 1</a> <span class="c">#!/usr/bin/env python</span></td>
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<a href="/annotate/853dcd4de2a6/primes.py#l2"
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<td class="source"><a href="#l2"> 2</a> </td>
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<td class="source"><a href="#l3"> 3</a> <span class="sd">"""Fun with generators. Corresponding Haskell implementation:</span></td>
</tr>
<tr id="l4">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#l4"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l4"> 4</a> </td>
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<tr id="l5">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#l5"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l5"> 5</a> <span class="sd">primes = 2 : sieve [3, 5..]</span></td>
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<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#l6"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l6"> 6</a> <span class="sd"> where sieve (p:ns) = p : sieve [n | n <- ns, mod n p /= 0]</span></td>
</tr>
<tr id="l7">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#l7"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l7"> 7</a> <span class="sd">"""</span></td>
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<a href="/annotate/853dcd4de2a6/primes.py#l8"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l8"> 8</a> </td>
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<a href="/annotate/853dcd4de2a6/primes.py#l9"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#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>
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title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l10"> 10</a> </td>
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<tr id="l11">
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<a href="/annotate/853dcd4de2a6/primes.py#l11"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l11"> 11</a> <span class="kn">def</span> <span class="nf">primes</span><span class="p">():</span></td>
</tr>
<tr id="l12">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#l12"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l12"> 12</a> <span class="sd">"""Generate all primes."""</span></td>
</tr>
<tr id="l13">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#l13"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#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 id="l14">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#l14"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#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>
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<a href="/annotate/853dcd4de2a6/primes.py#l15"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l15"> 15</a> <span class="c"># It is important to yield *here* in order to stop the</span></td>
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<td class="annotate">
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<td class="source"><a href="#l16"> 16</a> <span class="c"># infinite recursion.</span></td>
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<a href="/annotate/853dcd4de2a6/primes.py#l17"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l17"> 17</a> <span class="kn">yield</span> <span class="n">p</span></td>
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<a href="/annotate/853dcd4de2a6/primes.py#l18"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#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>
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title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#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 id="l20">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#l20"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l20"> 20</a> <span class="kn">yield</span> <span class="n">n</span></td>
</tr>
<tr id="l21">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#l21"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l21"> 21</a> </td>
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<a href="/annotate/853dcd4de2a6/primes.py#l22"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#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 id="l23">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#l23"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#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 id="l24">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#l24"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l24"> 24</a> </td>
</tr>
<tr id="l25">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#l25"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#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 id="l26">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#l26"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l26"> 26</a> <span class="kn">import</span> <span class="nn">sys</span></td>
</tr>
<tr id="l27">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#l27"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l27"> 27</a> <span class="kn">try</span><span class="p">:</span></td>
</tr>
<tr id="l28">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#l28"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#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 id="l29">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#l29"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#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 id="l30">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#l30"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l30"> 30</a> <span class="n">n</span> <span class="o">=</span> <span class="mf">10</span></td>
</tr>
<tr id="l31">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#l31"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l31"> 31</a> <span class="n">p</span> <span class="o">=</span> <span class="n">primes</span><span class="p">()</span></td>
</tr>
<tr id="l32">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#l32"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#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>
</tbody>
</table>
</div>
</div>
</div>
<script type="text/javascript">process_dates()</script>
</body>
</html>
hgweb fileannotate, raw
$ (get-with-headers.py localhost:$HGPORT 'annotate/tip/primes.py?style=raw') \
> | sed "s/test@//" > a
$ echo "200 Script output follows" > b
$ echo "" >> b
$ echo "" >> b
$ hg annotate "primes.py" >> b
$ echo "" >> b
$ echo "" >> b
$ echo "" >> b
$ echo "" >> b
$ cmp b a || diff -u b a
hgweb filerevision, raw
$ (get-with-headers.py localhost:$HGPORT 'file/tip/primes.py?style=raw') \
> > a
$ echo "200 Script output follows" > b
$ echo "" >> b
$ hg cat primes.py >> b
$ cmp b a || diff -u b a
hgweb highlightcss friendly
$ get-with-headers.py localhost:$HGPORT 'highlightcss' > out
$ head -n 4 out
200 Script output follows
/* pygments_style = friendly */
$ rm out
errors encountered
$ cat errors.log
$ killdaemons.py
Change the pygments style
$ cat > .hg/hgrc <<EOF
> [web]
> pygments_style = fruity
> EOF
hg serve again
$ hg serve -p $HGPORT -d -n test --pid-file=hg.pid -A access.log -E errors.log
$ cat hg.pid >> $DAEMON_PIDS
hgweb highlightcss fruity
$ get-with-headers.py localhost:$HGPORT 'highlightcss' > out
$ head -n 4 out
200 Script output follows
/* pygments_style = fruity */
$ rm out
errors encountered
$ cat errors.log
$ cd ..
$ hg init eucjp
$ cd eucjp
$ $PYTHON -c 'print("\265\376")' >> eucjp.txt # Japanese kanji "Kyo"
$ hg ci -Ama
adding eucjp.txt
$ hgserveget () {
> killdaemons.py
> echo % HGENCODING="$1" hg serve
> HGENCODING="$1" hg serve -p $HGPORT -d -n test --pid-file=hg.pid -E errors.log
> cat hg.pid >> $DAEMON_PIDS
>
> echo % hgweb filerevision, html
> get-with-headers.py localhost:$HGPORT "file/tip/$2" \
> | grep '<div class="parity0 source">'
> echo % errors encountered
> cat errors.log
> }
$ hgserveget euc-jp eucjp.txt
% HGENCODING=euc-jp hg serve
% hgweb filerevision, html
% errors encountered
$ hgserveget utf-8 eucjp.txt
% HGENCODING=utf-8 hg serve
% hgweb filerevision, html
% errors encountered
$ hgserveget us-ascii eucjp.txt
% HGENCODING=us-ascii hg serve
% hgweb filerevision, html
% errors encountered
$ cd ..