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When there is no .version-suffix file in nixpkgs (like when fetching nixpkgs with builtins.fetchGit), lib.version suffixes the version string with "pre-git". The "pre" bit is special cased in builtins.compareVersions which means "20.03pre-git" is interpreted as "less than 20.03". This is clearly wrong for the release-20.03 branch *after* the release has been made. Change the suffix to "post-git" to make code like this behave the same whether nixpkgs is fetched from git or the channel (which has .version-suffix file): lib.versionOlder lib.version "20.03" lib.versionAtLeast lib.version "20.03" (Currently the result depend on how nixpkgs was obtained!) This change should be made part of the release process.