Modify System.IO.Packaging files to ensure they are deterministic. Helpful for testing, build reproducibility, security verification, and ensuring package integrity across different build environments.

Example file formats that leverage System.IO.Packaging

• .nupkg
• Microsoft Office files

See Milestones for release notes.

• https://nuget.org/packages/DeterministicIoPackaging

• For an input package stream
• Duplicate each entry with a consistent compression and consistent order
• Omit package/services/metadata/core-properties/*.psmdcp entries
• For the relationships entry _rels/.rels
  • Modify the Id of each Relationship to be deterministic
  • Remove the Relationship for the .psmdcp entry
  • Order Relationships by Type
• For the relationships entry xl/_rels/workbook.xml.rels
  • Order Relationships by Type
• For the relationships entry docProps/core.xml
  • Remove the creator, created, lastModifiedBy, and modified elements

using var sourceStream = File.OpenRead(packagePath);
await DeterministicPackage.ConvertAsync(sourceStream, targetStream);

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using var sourceStream = File.OpenRead(packagePath);
await DeterministicPackage.ConvertAsync(sourceStream, targetStream);

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