immae@dilion ~ $ curl https://hydra.nixos.org/build/126812502/reproduce | bash (1:23) % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 4239 100 4239 0 0 27888 0 --:--:-- --:--:-- --:--:-- 27888 storing inputs and results in /tmp/build-126812502... fetching Git input ‘nixpkgs’ from ‘https://github.com/NixOS/nixpkgs.git’ (commit 0cebf41b6683bb13ce2b77bcb6ab1334477b5b29)... Cloning into '/tmp/build-126812502/nixpkgs/source.tmp'... remote: Enumerating objects: 2, done. remote: Counting objects: 100% (2/2), done. remote: Compressing objects: 100% (2/2), done. remote: Total 2065236 (delta 0), reused 0 (delta 0), pack-reused 2065234 Receiving objects: 100% (2065236/2065236), 1.18 GiB | 20.33 MiB/s, done. Resolving deltas: 100% (1417794/1417794), done. Updating files: 100% (22636/22636), done. Note: switching to '0cebf41b6683bb13ce2b77bcb6ab1334477b5b29'. You are in 'detached HEAD' state. You can look around, make experimental changes and commit them, and you can discard any commits you make in this state without impacting any branches by switching back to a branch. If you want to create a new branch to retain commits you create, you may do so (now or later) by using -c with the switch command. Example: git switch -c Or undo this operation with: git switch - Turn off this advice by setting config variable advice.detachedHead to false HEAD is now at 0cebf41b668 Release 20.09 alpha running nix-build... using these flags: --arg nixpkgs { outPath = /tmp/build-126812502/nixpkgs/source; rev = "0cebf41b6683bb13ce2b77bcb6ab1334477b5b29"; shortRev = "0cebf41"; revCount = "242760"; } -I nixpkgs=/tmp/build-126812502/nixpkgs/source --arg stableBranch false --arg supportedSystems [ "x86_64-linux" ] --option extra-binary-caches https://hydra.nixos.org/ --option system x86_64-linux /tmp/build-126812502/nixpkgs/source/nixos/release-combined.nix -A error: value is a string while an integer was expected, at /tmp/build-126812502/nixpkgs/source/nixos/release.nix:15:60 (use '--show-trace' to show detailed location information)