Luke Granger-Brown
57725ef3ec
git-subtree-dir: third_party/nixpkgs git-subtree-split: 76612b17c0ce71689921ca12d9ffdc9c23ce40b2
94 lines
2.9 KiB
Markdown
94 lines
2.9 KiB
Markdown
---
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name: Unreproducible package
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about: A package that does not produce a bit-by-bit reproducible result each time it is built
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title: ''
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labels: [ '0.kind: enhancement', '6.topic: reproducible builds' ]
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assignees: ''
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---
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<!--
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Hello dear reporter,
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Thank you for bringing attention to this issue. Your insights are valuable to
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us, and we appreciate the time you took to document the problem.
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I wanted to kindly point out that in this issue template, it would be beneficial
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to replace the placeholder `<package>` with the actual, canonical name of the
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package you're reporting the issue for. Doing so will provide better context and
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facilitate quicker troubleshooting for anyone who reads this issue in the
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future.
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Best regards
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-->
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Building this package multiple times does not yield bit-by-bit identical
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results, complicating the detection of Continuous Integration (CI) breaches. For
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more information on this issue, visit
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[reproducible-builds.org](https://reproducible-builds.org/).
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Fixing bit-by-bit reproducibility also has additional advantages, such as
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avoiding hard-to-reproduce bugs, making content-addressed storage more effective
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and reducing rebuilds in such systems.
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### Steps To Reproduce
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In the following steps, replace `<package>` with the canonical name of the
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package.
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#### 1. Build the package
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This step will build the package. Specific arguments are passed to the command
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to keep the build artifacts so we can compare them in case of differences.
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Execute the following command:
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```
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nix-build '<nixpkgs>' -A <package> && nix-build '<nixpkgs>' -A <package> --check --keep-failed
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```
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Or using the new command line style:
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```
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nix build nixpkgs#<package> && nix build nixpkgs#<package> --rebuild --keep-failed
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```
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#### 2. Compare the build artifacts
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If the previous command completes successfully, no differences were found and
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there's nothing to do, builds are reproducible.
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If it terminates with the error message `error: derivation '<X>' may not be
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deterministic: output '<Y>' differs from '<Z>'`, use `diffoscope` to investigate
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the discrepancies between the two build outputs. You may need to add the
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`--exclude-directory-metadata recursive` option to ignore files and directories
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metadata (*e.g. timestamp*) differences.
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```
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nix run nixpkgs#diffoscopeMinimal -- --exclude-directory-metadata recursive <Y> <Z>
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```
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#### 3. Examine the build log
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To examine the build log, use:
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```
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nix-store --read-log $(nix-instantiate '<nixpkgs>' -A <package>)
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```
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Or with the new command line style:
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```
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nix log $(nix path-info --derivation nixpkgs#<package>)
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```
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### Additional context
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(please share the relevant fragment of the diffoscope output here, and any
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additional analysis you may have done)
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---
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Add a :+1: [reaction] to [issues you find important].
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[reaction]: https://github.blog/2016-03-10-add-reactions-to-pull-requests-issues-and-comments/
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[issues you find important]: https://github.com/NixOS/nixpkgs/issues?q=is%3Aissue+is%3Aopen+sort%3Areactions-%2B1-desc
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