Git hashes still truncated too much

This is a follow-up of https://github.com/NixOS/hydra/issues/1245, which I believe still hasn't been fully fixed. The truncation still seems to be incorrect for some revs: For example, [this page](https://hydra.nixos.org/jobset/nixos/release-25.11) currently shows: > [1822415](https://hydra.nixos.org/eval/1822415) 8h ago nixpkgs → fa83fd8 However, GitHub is unable to resolve the commit with this hash: - https://github.com/NixOS/nixpkgs/commit/fa83fd8 - https://api.github.com/repos/NixOS/nixpkgs/commits/fa83fd8 Using the full commit hash works: - https://github.com/NixOS/nixpkgs/commit/fa83fd837f3098e3e678e6cf017b2b36102c7211 - https://api.github.com/repos/NixOS/nixpkgs/commits/fa83fd837f3098e3e678e6cf017b2b36102c7211 Surprisingly, GitHub displays the same 7 character short hash on the commit's page. ## Background This has happened to me repeatedly over the last few months for varying revisions. My use case is to use `hydra-check` (which uses the short rev displayed on hydra) to update my flake, and it is failing quite often due to the hash being too short. ``` NIXPKGS_REV=$(hydra-check --channel 25.11 --json | jq --raw-output '.["nixos/release-25.11"] | sort_by(.timestamp) | reverse | ((.[0] | select(.finished == true or .queued < 50)) // .[1]) | .short_rev') nix flake update --override-input nixpkgs "github:NixOS/nixpkgs/$NIXPKGS_REV" ```