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<h1 class="content-subhead">15 Aug 2016, 15:44</h1>
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<a href="https://codersherlock.github.io/post/Cross-Compile-RSync-ARM/" class="post-title">Cross Compile RSync ARM</a>
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under
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<a class="post-category post-category-2016-08" href="https://codersherlock.github.io//categories/2016-08">2016-08</a>
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<h1 id="cross-compile-rsync-to-arm-platform">Cross Compile Rsync to ARM platform</h1>
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<p>As always, feel free to ask. // Sherlock</p>
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<h2 id="motivation">Motivation</h2>
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<p>I got some issues about compile seafile to android, so instead of doing so, I start to figure out some other synchronize workflow. <a href="https://rsync.samba.org/">Rsync</a> is one of the most mature synchronization solution. So I made the decision on planting rsync to android.</p>
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<h2 id="pre-work">Pre-work</h2>
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<p>Rsync is a sync program with delta sync feature and based on SSH connection. So all we need to do is SSH support and cross compile tool-chain. Similar to what I mentioned in <a href="https://codersherlock.github.io/post/Cross-Compile-Seafile-2-ARM/">previews blog</a>, Android NDK and environment export need to be done before compilation.
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To enable normally use of compiled program, we need to make android support SSH. My solution is just install <a href="https://play.google.com/store/apps/details?id=berserker.android.apps.sshdroid&hl=en">SSHDroid</a> from Google Play Store.</p>
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<h2 id="cross-compile-rsync">Cross-Compile Rsync</h2>
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<p>Running following script to build rsync. It will generate a executable file named rsync in the root directory.</p>
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<pre><code>$ ./configure --build=${BUILD_SYS} --host=${TOOLCHAIN}
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$ make
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</code></pre>
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<h2 id="push-rsync-to-android">Push RSync to Android.</h2>
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<p>After installing SSHDroid, we can now push our arm-version-rsync to target machine.</p>
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<pre><code>$ adb push rsync /data/local/tmp
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$ adb shell
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$ cd /data/data/berserker.android.apps.sshdroid/dropbear
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$ mv ../../../local/tmp/rsync .
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</code></pre>
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<h2 id="run-rsync-with-argument">Run Rsync with argument</h2>
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<p>Now we can easily use rsync in android shell. Similar to what we use on PC.</p>
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<pre><code>$ ./rsync -e "./ssh" {target-data} {target-location}:{target-directory}
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</code></pre>
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<h2 id="references">References</h2>
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<p><a href="http://stackoverflow.com/questions/8130889/build-rsync-for-android">Build Rsync for Android</a></p>
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