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<h3>
Hervé Boutemy pushed to branch master
at <a href="https://salsa.debian.org/reproducible-builds/reproducible-website">Reproducible Builds / reproducible-website</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://salsa.debian.org/reproducible-builds/reproducible-website/commit/938e970d846ac30ce5f4545c194bb0c63370a048">938e970d</a></strong>
<div>
<span>by Hervé Boutemy</span>
<i>at 2019-12-06T11:23:17Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">link to maven-buildinfo-plugin</pre>
</li>
</ul>
<h4>1 changed file:</h4>
<ul>
<li class="file-stats">
<a href="#f41aac7b9416e1f7479621f6160ba422f03dd68b">
_docs/jvm.md
</a>
</li>
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<h4>Changes:</h4>
<li id="f41aac7b9416e1f7479621f6160ba422f03dd68b">
<a href="https://salsa.debian.org/reproducible-builds/reproducible-website/commit/938e970d846ac30ce5f4545c194bb0c63370a048#f41aac7b9416e1f7479621f6160ba422f03dd68b"><strong>_docs/jvm.md</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -9,7 +9,7 @@ see how-to [contribute]({{ "/contribute/" | prepend: site.baseurl }}).</td>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="markdown"></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="markdown">The JVM ecosystem provides many languages and build tools.</span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="markdown">Since the JVM is not reproducible-friendly from the beginning</span>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="markdown">-- jar/zip files<span class="idiff left right">, with files order and timestamp, are a first natural source of variation</span> --,</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="markdown">-- jar/zip files<span class="idiff left right"> are a first natural source of variation, with files order and timestamp</span> --,</span>
</pre>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="markdown">each build tool requires some work to provide Reproducible Builds.</span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="markdown"></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="markdown"><span class="gh" style="color: #999;">Buildinfo File</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -19,8 +19,8 @@ Whatever the build tool is, binary JVM artifacts are generally published in arti</td>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="markdown">that use the Maven2 repository format (using groupId/artifactId/version coordinates)</span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="markdown">like <span class="p">[</span><span class="nv" style="color: #008080;">Maven Central</span><span class="p">](</span><span class="sx" style="color: #d14;">https://search.maven.org/</span><span class="p">)</span> or <span class="p">[</span><span class="nv" style="color: #008080;">Google's Android Repository</span><span class="p">](</span><span class="sx" style="color: #d14;">https://dl.google.com/dl/android/maven2/index.html</span><span class="p">)</span>.</span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="markdown"></span>
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<pre style="margin: 0;">-<span id="LC22" class="line" lang="markdown">Being able to rebuild artifacts published in these repositories will require some information: where to get the sources from<span class="idiff left right">,</span></span>
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<pre style="margin: 0;">-<span id="LC23" class="line" lang="markdown"><span class="idiff left right">which environment to setup to rebuild the artifacts.</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="markdown">Being able to rebuild artifacts published in these repositories will require some information: where to get the sources from<span class="idiff left right">?</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="markdown"><span class="idiff left right">Which build environment to setup to rebuild the artifacts?</span></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="markdown"></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="markdown">This is the purpose of JVM Buildinfo files: they are expected to be published alongside artifacts</span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="markdown">as separate <span class="sb" style="color: #d14;">`${artifactId}-${version}.buildinfo`</span> file, with content in</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -83,8 +83,13 @@ Source tarballs, intended for building, are not always published in repositories</td>
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<pre style="margin: 0;"> <span id="LC83" class="line" lang="markdown"><span class="gh" style="color: #999;">Auditing a Build</span></span>
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<pre style="margin: 0;"> <span id="LC84" class="line" lang="markdown"><span class="gh" style="color: #999;">----------------</span></span>
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<pre style="margin: 0;"> <span id="LC85" class="line" lang="markdown"></span>
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<pre style="margin: 0;">-<span id="LC86" class="line" lang="markdown">As explained on top of this page, by default, jars  found in public repositories probably won't be reproducible. But you can try to rebuild them and</span>
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<pre style="margin: 0;">-<span id="LC87" class="line" lang="markdown">measure how much they are not reproducible:</span>
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<pre style="margin: 0;">+<span id="LC86" class="line" lang="markdown">Builds that are publishing a Buildinfo file are expected to be reproducible and the Buildinfo</span>
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<pre style="margin: 0;">+<span id="LC87" class="line" lang="markdown">file is expected to contain everything required to rebuild and get the same output:</span>
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<pre style="margin: 0;">+<span id="LC88" class="line" lang="markdown">if you find a Buildinfo file that is not sufficient to rebuild or you don't get the same result,</span>
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<pre style="margin: 0;">+<span id="LC89" class="line" lang="markdown">please get in contact with the project to help improve reproducibility.</span>
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<pre style="margin: 0;">+<span id="LC90" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC91" class="line" lang="markdown">Without Buildinfo file, as explained on top of this page, by default, jars  found in public repositories probably won't be reproducible.</span>
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<pre style="margin: 0;">+<span id="LC92" class="line" lang="markdown">But you can try to rebuild them and measure how much they are not reproducible:</span>
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="markdown"></span>
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<pre style="margin: 0;"> <span id="LC94" class="line" lang="markdown"><span class="p">1.</span> download the jar from a public repository,</span>
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<pre style="margin: 0;"> <span id="LC95" class="line" lang="markdown"><span class="p">2.</span> determine which major version of JDK was used to produce it: usually, the full Java version is found in <span class="sb" style="color: #d14;">`META-INF/MANIFEST.MF`</span> by running <span class="sb" style="color: #d14;">`unzip -p xxx.jar META-INF/MANIFEST.MF`</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="110" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -105,6 +110,9 @@ Getting reproducible builds with Maven requires some plugins configuration: see</td>
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<pre style="margin: 0;"> <span id="LC110" class="line" lang="markdown"><span class="p">[</span><span class="nv" style="color: #008080;">Maven - Guide to Configuring for Reproducible Builds</span><span class="p">](</span><span class="sx" style="color: #d14;">https://maven.apache.org/guides/mini/guide-reproducible-builds.html</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC111" class="line" lang="markdown">for more details.</span>
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<pre style="margin: 0;"> <span id="LC112" class="line" lang="markdown"></span>
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<td class="diff-line-num new new_line" data-linenumber="113" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="markdown">Work is in progress also with <span class="p">[</span><span class="nv" style="color: #008080;">maven-buildinfo-plugin</span><span class="p">](</span><span class="sx" style="color: #d14;">https://github.com/apache/maven-studies/tree/maven-buildinfo-plugin</span><span class="p">)</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="114" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="markdown">to easily provide Buildinfo files once a build has been made reproducible.</span>
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<td class="diff-line-num new new_line" data-linenumber="115" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="markdown"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="108" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
108
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<td class="diff-line-num new_line" data-linenumber="116" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC116" class="line" lang="markdown"><span class="gu" style="color: #800080; font-weight: 600;">### source release archive</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="109" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="117" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC117" class="line" lang="markdown">To create a source release archive, see <span class="p">[</span><span class="nv" style="color: #008080;">Apache Source Release Assembly Descriptor</span><span class="p">](</span><span class="sx" style="color: #d14;">https://maven.apache.org/apache-resource-bundles/#Source_Release_Assembly_Descriptor</span><span class="p">)</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC118" class="line" lang="markdown">that is commonly used. Nothing prevents you to create your own assembly descriptor or even use another plugin: don't hesitate to share recipes.</span>
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