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<h3>
Chris Lamb pushed to branch master
at <a href="https://salsa.debian.org/reproducible-builds/reproducible-website">Reproducible Builds / reproducible-website</a>
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<h4>
Commits:
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<li>
<strong><a href="https://salsa.debian.org/reproducible-builds/reproducible-website/-/commit/a444890bc68f4e38a50a30e2d5019f0c3177193e">a444890b</a></strong>
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<span>by Chris Lamb</span>
<i>at 2021-06-18T11:18:21+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document non-reproducibility arising from abbreviated Git hashes. (Closes: reproducible-builds/reproducible-website#31)
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<h4>1 changed file:</h4>
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<a href="#40d9f91ff2422e77cfe9af1fc597ae9d51a89322">
_docs/version_information.md
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<h4>Changes:</h4>
<li id="40d9f91ff2422e77cfe9af1fc597ae9d51a89322">
<a href="https://salsa.debian.org/reproducible-builds/reproducible-website/-/commit/a444890bc68f4e38a50a30e2d5019f0c3177193e#40d9f91ff2422e77cfe9af1fc597ae9d51a89322"><strong>_docs/version_information.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">@@ -5,18 +5,28 @@ permalink: /docs/version-information/</td>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="markdown"><span class="nn" style="color: #555;">---</span></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="markdown"></span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="markdown">Version information embedded in the software needs to be made</span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="markdown">deterministic. Counter-examples are using the current date or an</span>
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="markdown"><span class="idiff left right">incremental </span>build counter.</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="markdown">deterministic. Counter-examples are using the current date or an<span class="idiff left right"> incremental</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="markdown">build counter.</span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="markdown"></span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="markdown">The date and time of the build itself is hardly of value as an old</span>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="markdown"><span class="idiff left right">source </span>code can always be compiled long after it has been released.</span>
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="markdown"><span class="idiff left right">It's best when </span>version information gives a good indication of what source</span>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="markdown"><span class="idiff left right">code has been </span>built.</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="markdown">The date and time of the build itself is hardly of value as an old<span class="idiff left right"> source</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="markdown">code can always be compiled long after it has been released.<span class="idiff left right"> It's best when</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="markdown">version information gives a good indication of what source<span class="idiff left right"> code has been</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="markdown">built.</span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="markdown"></span>
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<pre style="margin: 0;">-<span id="LC16" class="line" lang="markdown">The version number can come from a dedicated source file, a <span class="ge" style="font-style: italic;">*changelog*</span>,</span>
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="markdown">or from a version control system. If a date is needed, it can be</span>
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<pre style="margin: 0;">-<span id="LC18" class="line" lang="markdown">extracted from the <span class="ge" style="font-style: italic;">*changelog*</span> or the version control system. A</span>
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="markdown">cryptographic checksum can also help to pinpoint the exact source</span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="markdown">content. This makes <span class="p">[</span><span class="nv" style="color: #008080;">Git</span><span class="p">](</span><span class="sx" style="color: #d14;">https://git-scm.com/</span><span class="p">)</span> commit ids good</span>
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<pre style="margin: 0;">-<span id="LC21" class="line" lang="markdown">candidates as part of version information.</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="markdown">The version number can come from a dedicated source file, a <span class="ge" style="font-style: italic;">*changelog*</span>, or</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="markdown">from a version control system. If a date is needed, it can be extracted from</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="markdown">the <span class="ge" style="font-style: italic;">*changelog*</span> or the version control system.</span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="markdown"><span class="gu" style="color: #800080; font-weight: 600;">## Git checksums</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">Cryptographic checksums from revision control systems can be used to identify source content. <span class="p">[</span><span class="nv" style="color: #008080;">Git</span><span class="p">](</span><span class="sx" style="color: #d14;">https://git-scm.com/</span><span class="p">)</span> commit IDs are thus a good candidate to include as as part of version information.</span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="markdown">However, abbreviated Git hash identifies (such as those obtained via <span class="sb" style="color: #d14;">`git describe`</span> or <span class="sb" style="color: #d14;">`git rev-parse`</span>) can be a source of non-reproducibility. This is because the number of hexadecimal characters in the abbreviated hash is <span class="ge" style="font-style: italic;">*dependent on the number of objects in the Git repository*</span>.</span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="markdown">The number of objects will not only change over time (due to other commits, even those not on the primary development branch), but it will also dramatically change if a 'shallow' clone is made (see <span class="sb" style="color: #d14;">`git-clone(1)`</span>) -- these have fewer objects by design. To quote from the <span class="sb" style="color: #d14;">`git-config(1)`</span> manual page:</span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="markdown"><span class="gt" style="color: #a00;">> `core.abbrev`</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="markdown"><span class="gt" style="color: #a00;">></span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="markdown"><span class="gt" style="color: #a00;">> Set the length object names are abbreviated to. If unspecified or set to "`auto`", an appropriate value is computed based on the approximate number of packed objects in your repository, which hopefully is enough for abbreviated object names to stay unique for some time. If set to "`no`", no abbreviation is made and the object names are shown in their full length. The minimum length is 4.</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="markdown">Therefore, it is recommended that a fixed (or "<span class="sb" style="color: #d14;">`no`</span>") truncation is specified when obtaining identifiers by using, for example, <span class="sb" style="color: #d14;">`git describe --abrev=12`</span>, <span class="sb" style="color: #d14;">`git rev-parse --short=12`</span> or the <span class="sb" style="color: #d14;">`core.abbrev config`</span> setting.</span></pre>
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