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<p class="MsoNormal">Hello all,<o:p></o:p></p>
<p class="MsoNormal">I’m experimenting with reproducible builds and, while I’ve managed to generate several packages with correct hashsums (per reproducible-builds.org), there are ~9 packages where I consistently get a different checksum.<o:p></o:p></p>
<p class="MsoNormal">Focusing on one package for this discussion…<o:p></o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Libgcrypt20 shows as reproducible on reproducible-builds.org (<a href="https://tests.reproducible-builds.org/debian/rb-pkg/buster/amd64/libgcrypt20.html">https://tests.reproducible-builds.org/debian/rb-pkg/buster/amd64/libgcrypt20.html</a>)<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">The expected sha256 checksum for the amd64 buster binary package (libgcrypt20_1.8.4-5_amd64.deb) is 2bc9a895cb63bea72bf2145ff44f37b9a746ba97a967f0b4c73691d07793303c.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">However, I’ve tried multiple build tools (pbuilder and sbuild), multiple build machines, and multiple host OSes (Stretch and Buster – though the chroot is always buster). I *consistently*
get a different sha256 checksum for this package: bbde6cee1fd915e5257b7c47977d8e88dc5e45816fe241fd8751a50aea98c6b8.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">I have already confirmed that the downloaded sources (libgcrypt20_1.8.4-5.debian.tar.xz, libgcrypt20_1.8.4.orig.tar.bz2) match the expected sha256 checksums.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">The resultant “dev” packages (libgcrypt20-dev_1.8.4-5_amd64.deb and libgcrypt20-dev-dbgsym_1.8.4-5_amd64.deb) *<b>do</b>* have checksums that match those on reproducible-builds.org,
but none of the other packages match.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">The documentation (<a href="https://wiki.debian.org/ReproducibleBuilds/Howto#Testing_procedure">https://wiki.debian.org/ReproducibleBuilds/Howto#Testing_procedure</a>) indicates that
sbuild is the preferred tool, but the build <a href="(https:/tests.reproducible-builds.org/debian/rbuild/buster/amd64/libgcrypt20_1.8.4-5.rbuild.log.gz">
(https://tests.reproducible-builds.org/debian/rbuild/buster/amd64/libgcrypt20_1.8.4-5.rbuild.log.gz</a>) is clearly using pbuilder. So one of these should work. And they both ultimately call dpkg-buildpackage anyway. Is there another recommended toolchain?<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">All of my builds have been on VM’s – maybe this package requires a “bare metal” build host?<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Anything else I could have missed? I’ve looked at the documentation, but most of it centers on how to make a package reproducible (e.g. build paths and timestamps) not how to configure
a build environment. I also don’t see anything in the libgcrypt20 source providing specific build environment instructions. It seems like this should “just work” when the correct toolchain is used – which it does for most cases.<o:p></o:p></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks for any recommendations,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:"Segoe UI Light",sans-serif;color:#1F497D">Matt Bearup<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Segoe UI Light",sans-serif;color:#1F497D">Software Developer – CEH, CISSP, GCUX<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Segoe UI Light",sans-serif;color:#1F497D">Microsoft Azure
</span><img border="0" width="23" height="17" style="width:.2395in;height:.177in" id="Picture_x0020_1" src="cid:image001.png@01D537D0.F3198980"><span style="font-family:"Segoe UI Light",sans-serif;color:#1F497D"> Linux<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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