SourceDateEpoch

Definition

SourceDateEpoch is an environment variable used to provide a reproducible timestamp for build processes. It is primarily utilized in software development to ensure that builds are deterministic, meaning that the same source code will produce identical binaries regardless of when or where the build occurs. This is particularly useful for verifying the integrity of software and ensuring that no unintended changes have been introduced.

Secure Settings Example

export SOURCE_DATE_EPOCH=$(date +%s)

In this example, the SOURCE_DATE_EPOCH is set to the current Unix timestamp, ensuring that the build process uses a consistent and reproducible timestamp.

Insecure Settings Example

export SOURCE_DATE_EPOCH=$(date)

Using a non-epoch date format can lead to non-deterministic builds, as the output will vary depending on the locale and format settings of the system, thus compromising reproducibility.