Issue Details

Number

29935

Title

guix: SOURCE_DATE_EPOCH is already set in some environments

Description

The environment variable `SOURCE_DATE_EPOCH` allows overriding the date that will be used inside the archives for guix-built binaries. This is an intentional feature, as documented in `contrib/guix/README.md`: > * _**SOURCE_DATE_EPOCH**_ > > Override the reference UNIX timestamp used for bit-for-bit reproducibility, > the variable name conforms to [standard][r12e/source-date-epoch]. > > _(defaults to the output of `$(git log --format=%at -1)`)_ However, some environments, as apparently Nix, set `SOURCE_DATE_EPOCH` by default. This can be extremely confusing, as it results in mismatches. i see three options: - Show a big red warning when the Guix build scripts are called with an existing `SOURCE_DATE_EPOCH`. Most likely it's not what the user wanted, but they can continue if they wanted. - Disallow overriding `SOURCE_DATE_EPOCH` - unset it at start. - Rename our `SOURCE_DATE_EPOCH` to something non-standard that doesn't conflict with Nix. The first one has my preference. See bitcoin-core/guix.sigs#1201 which prompted this.

URL

https://github.com/bitcoin/bitcoin/issue/29935

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