search

NixOS / nixpkgs

Nix Packages collection & NixOS
MIT License
17.43k stars 13.64k forks source link

gegl: dev output leaks thread count and build timestamp #230278

Open raboof opened 1 year ago

raboof commented 1 year ago

Building this package twice does not produce the bit-by-bit identical result each time, making it harder to detect CI breaches. You can read more about this at https://reproducible-builds.org/ .

Fixing bit-by-bit reproducibility also has additional advantages, such as avoiding hard-to-reproduce bugs, making content-addressed storage more effective and reducing rebuilds in such systems.

Steps To Reproduce

nix-build '<nixpkgs>' -A gegl.dev --check --keep-failed

You can use diffoscope to analyze the differences in the output of the two builds.

To view the build log of the build that produced the artifact in the binary cache:

nix-store --read-log $(nix-instantiate '<nixpkgs>' -A gegl)

Additional context

https://reproducible.nixos.org/nixos-iso-gnome-runtime/diff/772365d091bf360014e12d75ccec1356f69d324132a54164d35a6236e3a3efa9-535322532b56cd5259c9a401fdc672857575fe9eb4a8ce8cb7008edf8aeee0c5.html

YorikSar commented 1 year ago

Found upstream issue: https://gitlab.gnome.org/GNOME/gegl/-/issues/337