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<a name="Making-Changes"></a>
<div class="header">
<p>
Next: <a href="Dealing-with-a-Fork.html#Dealing-with-a-Fork" accesskey="n" rel="next">Dealing with a Fork</a>, Previous: <a href="Synchronising-Databases.html#Synchronising-Databases" accesskey="p" rel="prev">Synchronising Databases</a>, Up: <a href="Tutorial.html#Tutorial" accesskey="u" rel="up">Tutorial</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="General-Index.html#General-Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="Making-Changes-1"></a>
<h3 class="section">2.10 Making Changes</h3>

<p>Abe decides to do some work on his part of the code. He has a copy of
Jim&rsquo;s database contents, but cannot edit any of that data yet.  He
begins his editing by checking out the head of the
<code>jp.co.juicebot.jb7</code> branch into a workspace, so he can edit
it:
</p>
<div class="smallexample">
<pre class="smallexample">$ mtn --db=abe.mtn --branch=jp.co.juicebot.jb7 checkout .
</pre></div>

<p>Monotone unpacks the set of files in the head revision&rsquo;s manifest
directly into Abe&rsquo;s current directory.  (If he had specified something
other than <samp>.</samp> at the end, monotone would have created that
directory and unpacked the files into it.)  Abe then opens up one of the
files, <samp>src/apple.c</samp>, and edits it:
</p>
<div class="smallexample">
<pre class="smallexample">$ vi src/apple.c
<i>&lt;Abe writes some apple-juice dispensing code&gt;</i>
</pre></div>

<p>The file <samp>src/apple.c</samp> has now been <em>changed</em>. Abe gets
up to answer a phone call, and when he returns to his work he has
forgotten what he changed. He can ask monotone for details:
</p>
<div class="smallexample">
<pre class="smallexample">$ mtn diff
#
# old_revision [493bda86628fd72c992eb56f73899db9ead3cf6f]
#
# patch &quot;src/apple.c&quot;
#  from [1ce885d2cc59842ff16785834391e864068fbc3c]
#    to [e2c64f6bde75a192d48d2256385df3dd7a963349]
#
============================================================
--- src/apple.c 1ce885d2cc59842ff16785834391e864068fbc3c
+++ src/apple.c e2c64f6bde75a192d48d2256385df3dd7a963349
@ -3,5 +3,8 @ dispense_apple_juice()
 void
 dispense_apple_juice()
 {
-  /* Fill this in please, Abe. */
+  spoutctl(APPLE_SPOUT, FLOW_JUICE, 1);
+  while (spoutctl(APPLE_SPOUT, POLL_JUICE, 1) == 0)
+    usleep (1000);
+  spoutctl(APPLE_SPOUT, FLOW_JUICE, 0);
 }
</pre></div>

<p>Satisfied with his day&rsquo;s work, Abe decides to commit.
</p>
<div class="smallexample">
<pre class="smallexample">$ mtn commit
</pre></div>

<p>Abe neglected to provide a <samp>--message</samp> option specifying the
change log on the command line.  Monotone therefore invokes an
external &ldquo;log message editor&rdquo; &mdash; typically an editor like
<code>vi</code> &mdash; with an explanation of the changes being committed
and the opportunity to enter a log message.
</p>
<div class="smallexample">
<pre class="smallexample">

*** REMOVE THIS LINE TO CANCEL THE COMMIT ***
-- Enter a description of this change above --
-- Edit fields below to modify certificate values --
Branch:    right
Author:    tester@test.net
Date:      2010-09-11T12:03:15

-- Modifications below this line are ignored --
Changes against parent 493bda86628fd72c992eb56f73899db9ead3cf6f

  patched  src/apple.c

</pre></div>

<p>Abe enters a single line at the top of the file, saying &ldquo;polling
implementation of src/apple.c&rdquo;. He then saves the file and quits the
editor. Monotone extracts the message to be stored in the associated
&ldquo;changelog&rdquo; cert. Returning to the shell, Abe&rsquo;s commit completes:
</p>
<div class="smallexample">
<pre class="smallexample">mtn: beginning commit on branch 'jp.co.juicebot.jb7'
mtn: committed revision 42eae36587508faa664b111cefc291f0b85ef83a
</pre></div>

<p>Abe then sends his new revision back to Jim:
</p>
<div class="smallexample">
<pre class="smallexample">$ mtn sync
mtn: connecting to mtn://jim-laptop.juicebot.co.jp
mtn: finding items to synchronize:
mtn:   certs |    keys | revisions
mtn:       8 |       2 |         2
mtn: bytes in | bytes out | revs in | revs out | revs written
mtn:      615 |      2822 |       0 |        1 |            0
mtn: successful exchange with mtn://jim-laptop.juicebot.co.jp
</pre></div>

<p>Beth does a similar sequence. First she syncs her database with
Jim&rsquo;s:
</p>
<div class="smallexample">
<pre class="smallexample">$ mtn --db=:beth sync &quot;mtn://jim-laptop.juicebot.co.jp?jp.co.juicebot.jb7*&quot;
mtn: connecting to mtn://jim-laptop.juicebot.co.jp
mtn: first time connecting to server mtn://jim-laptop.juicebot.co.jp
mtn: I'll assume it's really them, but you might want to double-check
mtn: their key's fingerprint: 9e9e9ef1d515ad58bfaa5cf282b4a872d8fda00c
mtn: warning: saving public key for jim@juicebot.co.jp to database
mtn: finding items to synchronize:
mtn: bytes in | bytes out | revs in | revs out | revs written
mtn:     4601 |      1239 |       2 |        0 |            1
mtn: verifying new revisions (this may take a while)
mtn: bytes in | bytes out | revs in | revs out | revs written
mtn:     4601 |      1285 |       2 |        0 |            2
mtn: successful exchange with mtn://jim-laptop.juicebot.co.jp
</pre></div>

<p>She checks out a copy of the tree from her database:
</p>
<div class="smallexample">
<pre class="smallexample">$ mtn --db=:beth --branch=jp.co.juicebot.jb7 checkout juicebot
</pre></div>

<p>and since she is using a managed database, monotone automatically remembers
the connection between the newly created workspace and the database.  She
now looks at the output of <code>mtn list databases</code> and sees the
following:
</p>
<div class="smallexample">
<pre class="smallexample">$ mtn list databases
:beth.mtn (in /home/beth/.monotone/databases):
        jp.co.juicebot.jb7 (in /home/beth/juicebot)
</pre></div>

<p>Beth realizes that, whenever the database of the workspace changes, monotone
will adapt the known paths for the old and the new database for her.
</p>
<p>But let us get back to the work, Beth now start to edits the file
<samp>src/banana.c</samp>:
</p>
<div class="smallexample">
<pre class="smallexample">$ vi src/banana.c
<i>&lt;Beth writes some banana-juice dispensing code&gt;</i>
</pre></div>

<p>and logs her changes in <samp>_MTN/log</samp> right away so she does not
forget what she has done like Abe.
</p>
<div class="smallexample">
<pre class="smallexample">$ vi _MTN/log
* src/banana.c: Added polling implementation
</pre></div>

<p>Later, she commits her work.  Monotone again invokes an external editor
for her to edit her log message, but this time it fills in the messages
she&rsquo;s written so far, and she simply checks them over one last time
before finishing her commit:
</p>
<div class="smallexample">
<pre class="smallexample">$ mtn commit
mtn: beginning commit on branch 'jp.co.juicebot.jb7'
mtn: committed revision 85573a54105cd3220db10aa6a0713643cdf5ce6f
</pre></div>

<p>And she syncs with Jim again:
</p>
<div class="smallexample">
<pre class="smallexample">$ mtn sync
mtn: connecting to mtn://jim-laptop.juicebot.co.jp
mtn: finding items to synchronize:
mtn:   certs |    keys | revisions
mtn:      12 |       3 |         3
mtn: bytes in | bytes out | revs in | revs out | revs written
mtn:      709 |      2879 |       0 |        1 |            0
mtn: successful exchange with mtn://jim-laptop.juicebot.co.jp
</pre></div>

<hr>
<div class="header">
<p>
Next: <a href="Dealing-with-a-Fork.html#Dealing-with-a-Fork" accesskey="n" rel="next">Dealing with a Fork</a>, Previous: <a href="Synchronising-Databases.html#Synchronising-Databases" accesskey="p" rel="prev">Synchronising Databases</a>, Up: <a href="Tutorial.html#Tutorial" accesskey="u" rel="up">Tutorial</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="General-Index.html#General-Index" title="Index" rel="index">Index</a>]</p>
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