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<p>Hi Fay,</p>
<p><br>
</p>
<p>Thanks for looking into it!</p>
<p><br>
</p>
<p>> <font size="2"><span style="font-size:10pt">which suggest the issue is in a dependency, not diffoscope itself.</span></font></p>
<p><br>
</p>
<p>We also think so, and `file` if developers are convinced, they should fix this. Anyway, diffoscope should also take care of parsing this non-deterministic output.</p>
<p><br>
</p>
<p>> <font size="2"><span style="font-size:10pt">Can you give us the output of directly running file(1) on the .class<br>
files?</span></font><br>
</p>
<p><br>
</p>
<p><img size="0" id="x_img265158" tabindex="0" style="max-width:99.9%" src="cid:ac0258e5-3c04-4bdf-a61f-517c2d336331"><br>
</p>
<p><img size="0" id="x_img695937" tabindex="0" style="max-width:99.9%" src="cid:350eccdb-1f46-4b2e-94a3-cbdd0228c12d"><br>
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<p>I have also attached the classfile with this email.</p>
<p><br>
</p>
<p>These outputs are from <a href="https://www.pdc.kth.se/hpc-services/computing-systems/dardel-1.1043529" class="x_OWAAutoLink">
Dardel</a>, supercomputer at KTH. We have already provided the environment details. But maybe this information is also relevant.<br>
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<div style="margin-top:0; margin-bottom:0"><span style="color:rgb(0,0,0); font-family:Garamond,Georgia,serif">Regards,</span></div>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Fay Stegerman <flx@obfusk.net><br>
<b>Sent:</b> Friday, August 23, 2024 6:26:14 PM<br>
<b>To:</b> diffoscope users and developers<br>
<b>Cc:</b> Javier Ron Arteaga; Aman Sharma<br>
<b>Subject:</b> Re: [diffoscope] Diffoscope inconsistency</font>
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<font size="2"><span style="font-size:10pt;">
<div class="PlainText">Hi,<br>
<br>
* Javier Ron via diffoscope <diffoscope@lists.reproducible-builds.org> [2024-08-23 17:18]:<br>
> Hello Diffoscope team,<br>
> <br>
> We discovered inconsistent behavior while running the tool for compiled java<br>
> classes.<br>
> <br>
> When running in Ubuntu Jammy with libmagic 5.42, the java classes were being<br>
> compared as java bytecode,<br>
> as expected.<br>
> <br>
> When running in SUSE 15.5, with libmagic 5.32 the java classes were being<br>
> compared as hexdumps.<br>
> <br>
> We tracked the issue and found that the retrieved magic contained "Cafe<br>
> Babe" at the beginning, thus<br>
> the corresponding java regex <<a href="https://salsa.debian.org/reproducible-builds/diffoscope/-/blob/master/diffoscope/comparators/java.py#L78">https://salsa.debian.org/reproducible-builds/diffoscope/-/blob/master/diffoscope/comparators/java.py#L78</a>><br>
> failed to match.<br>
<br>
A quick look at the file(1) source code [1] shows that both versions should<br>
output the string "compiled Java class data" for .class files (though there have<br>
been some other changes, so it's possible the older libmagic gives an incorrect<br>
result). So the regex used by diffoscope should be correct even for the older<br>
libmagic, which suggest the issue is in a dependency, not diffoscope itself.<br>
<br>
I'm not sure what you mean by "the retrieved magic contained 'Cafe Babe'"<br>
exactly? Can you give us the output of directly running file(1) on the .class<br>
files? For example:<br>
<br>
$ file Foo.class<br>
Foo.class: compiled Java class data, version 65.0<br>
<br>
I get the same result when using the old magic/Magdir/cafebabe from 5.32 (though<br>
with a more recent version of file(1)).<br>
<br>
- Fay<br>
<br>
[1] <a href="https://github.com/file/file">https://github.com/file/file</a><br>
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