In flakes, `inputs.nixpkgs.follows = "lix/nixpkgs"` causes it to be relocked to the latest revision #648

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opened 2025-01-24 18:49:13 +00:00 by jade · 1 comment

jade commented

2025-01-24 18:49:13 +00:00

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~/lix » git clone https://git.lix.systems/lix-project/nix-eval-jobs foo
Cloning into 'foo'...
remote: Enumerating objects: 1946, done.
remote: Counting objects: 100% (137/137), done.
remote: Compressing objects: 100% (137/137), done.
remote: Total 1946 (delta 87), reused 0 (delta 0), pack-reused 1809 (from 1)
Receiving objects: 100% (1946/1946), 488.63 KiB | 3.54 MiB/s, done.
Resolving deltas: 100% (1118/1118), done.

~/lix » cd foo

lix/foo » git rev-parse HEAD
6482bee40b89ab2c28d2e988848aa9ae0429d78c

lix/foo » nvim flake.nix # make some edits, see below

lix/foo » git diff flake.nix | cat

diff flake.nix:

diff --git a/flake.nix b/flake.nix
index cc805f2..93bf1f1 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "Hydra's builtin hydra-eval-jobs as a standalone";

-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11-small";
+  inputs.nixpkgs.follows = "lix/nixpkgs";
   inputs.flake-parts.url = "github:hercules-ci/flake-parts";
   inputs.flake-parts.inputs.nixpkgs-lib.follows = "nixpkgs";
   inputs.treefmt-nix.url = "github:numtide/treefmt-nix";
@@ -10,7 +10,6 @@
   inputs.nix-github-actions.inputs.nixpkgs.follows = "nixpkgs";
   inputs.lix = {
     url = "https://git.lix.systems/lix-project/lix/archive/main.tar.gz";
-    inputs.nixpkgs.follows = "nixpkgs";
   };

   outputs = inputs @ { flake-parts, ... }:

Lock it:

lix/foo » nix flake lock
warning: updating lock file '/Users/jade/lix/foo/flake.lock':
• Updated input 'lix/nixpkgs':
    follows 'nixpkgs'
  → 'github:NixOS/nixpkgs/035f8c0853c2977b24ffc4d0a42c74f00b182cd8' (2025-01-23)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/bf68d76e54ac5da0d77f82656a37552996195e80' (2025-01-18)
  → follows 'lix/nixpkgs'

Note revision of nixpkgs from 2025-01-23! Yet see what Lix has locked:

lix/foo » nix flake metadata --inputs-from . lix
Resolved URL:  https://git.lix.systems/api/v1/repos/lix-project/lix/archive/079528098f5998ba13c88821a2eca1005c1695de.tar.gz?narHash=sha256-pgDJZjj4jpzkFxsqBTI/9Yb0n3gW%2BDvDtuv9SwQZZcs%3D&rev=079528098f5998ba13c88821a2eca1005c1695de
Locked URL:    https://git.lix.systems/api/v1/repos/lix-project/lix/archive/079528098f5998ba13c88821a2eca1005c1695de.tar.gz?narHash=sha256-pgDJZjj4jpzkFxsqBTI/9Yb0n3gW%2BDvDtuv9SwQZZcs%3D&rev=079528098f5998ba13c88821a2eca1005c1695de
Description:   Lix: A modern, delicious implementation of the Nix package manager
Path:          /nix/store/gl8c7im641zwckcchp82fh1cn2w339i5-source
Revision:      079528098f5998ba13c88821a2eca1005c1695de
Last modified: 2025-01-18 13:04:46
Inputs:
├───flake-compat: github:edolstra/flake-compat/0f9255e01c2351cc7d116c072cb317785dd33b33
│   Last modified: 2023-10-04 06:37:54
├───nix2container: github:nlewo/nix2container/fa6bb0a1159f55d071ba99331355955ae30b3401
│   Last modified: 2024-08-29 22:48:55
├───nixpkgs: github:NixOS/nixpkgs/9ecb50d2fae8680be74c08bb0a995c5383747f89
│   Last modified: 2024-12-04 13:42:25
├───nixpkgs-regression: github:NixOS/nixpkgs/215d4d0fd80ca5163643b03a33fde804a29cc1e2
│   Last modified: 2022-01-24 11:20:45
└───pre-commit-hooks: github:cachix/git-hooks.nix/6f4e2a2112050951a314d2733a994fbab94864c6
    Last modified: 2024-12-04 05:28:28

So it took the spec from lix and relocked it! Busted.

Here's what it did to the lock file:

lix/foo » git cat-file -p HEAD:flake.lock > flake.lock.old
lix/foo » json-diff flake.lock.old flake.lock

 {
   nodes: {
     lix: {
       inputs: {
-        nixpkgs: [
-          "nixpkgs"
-        ]
+        nixpkgs: "nixpkgs"
       }
     }
     nixpkgs: {
       locked: {
-        lastModified: 1737226685
+        lastModified: 1737672001
-        narHash: "sha256-34x0t/x5SkClo04gaG+KPBwN9JtXjFSQGTl//Yry4Gc="
+        narHash: "sha256-YnHJJ19wqmibLQdUeq9xzE6CjrMA568KN/lFPuSVs4I="
-        rev: "bf68d76e54ac5da0d77f82656a37552996195e80"
+        rev: "035f8c0853c2977b24ffc4d0a42c74f00b182cd8"
       }
     }
     root: {
       inputs: {
-        nixpkgs: "nixpkgs"
+        nixpkgs: [
+          "lix"
+          "nixpkgs"
+        ]
       }
     }
   }
 }

nix (Lix, like Nix) 2.93.0-dev-pre20250122-1fe6064
System type: aarch64-darwin
Additional system types: x86_64-darwin
Features: gc, signed-caches
System configuration file: /etc/nix/nix.conf
User configuration files: /Users/jade/.config/nix/nix.conf:/etc/xdg/nix/nix.conf
Store directory: /nix/store
State directory: /nix/var/nix
Data directory: /nix/store/xivaab7i0ndb84r0gc46jszfzdfhwimg-lix-2.93.0-dev-pre20250122-1fe6064/share

``` ~/lix » git clone https://git.lix.systems/lix-project/nix-eval-jobs foo Cloning into 'foo'... remote: Enumerating objects: 1946, done. remote: Counting objects: 100% (137/137), done. remote: Compressing objects: 100% (137/137), done. remote: Total 1946 (delta 87), reused 0 (delta 0), pack-reused 1809 (from 1) Receiving objects: 100% (1946/1946), 488.63 KiB | 3.54 MiB/s, done. Resolving deltas: 100% (1118/1118), done. ~/lix » cd foo lix/foo » git rev-parse HEAD 6482bee40b89ab2c28d2e988848aa9ae0429d78c lix/foo » nvim flake.nix # make some edits, see below lix/foo » git diff flake.nix | cat ``` diff flake.nix: ```diff diff --git a/flake.nix b/flake.nix index cc805f2..93bf1f1 100644 --- a/flake.nix +++ b/flake.nix @@ -1,7 +1,7 @@ { description = "Hydra's builtin hydra-eval-jobs as a standalone"; - inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11-small"; + inputs.nixpkgs.follows = "lix/nixpkgs"; inputs.flake-parts.url = "github:hercules-ci/flake-parts"; inputs.flake-parts.inputs.nixpkgs-lib.follows = "nixpkgs"; inputs.treefmt-nix.url = "github:numtide/treefmt-nix"; @@ -10,7 +10,6 @@ inputs.nix-github-actions.inputs.nixpkgs.follows = "nixpkgs"; inputs.lix = { url = "https://git.lix.systems/lix-project/lix/archive/main.tar.gz"; - inputs.nixpkgs.follows = "nixpkgs"; }; outputs = inputs @ { flake-parts, ... }: ``` Lock it: ``` lix/foo » nix flake lock warning: updating lock file '/Users/jade/lix/foo/flake.lock': • Updated input 'lix/nixpkgs': follows 'nixpkgs' → 'github:NixOS/nixpkgs/035f8c0853c2977b24ffc4d0a42c74f00b182cd8' (2025-01-23) • Updated input 'nixpkgs': 'github:NixOS/nixpkgs/bf68d76e54ac5da0d77f82656a37552996195e80' (2025-01-18) → follows 'lix/nixpkgs' ``` Note revision of nixpkgs from 2025-01-23! Yet see what Lix has locked: ``` lix/foo » nix flake metadata --inputs-from . lix Resolved URL: https://git.lix.systems/api/v1/repos/lix-project/lix/archive/079528098f5998ba13c88821a2eca1005c1695de.tar.gz?narHash=sha256-pgDJZjj4jpzkFxsqBTI/9Yb0n3gW%2BDvDtuv9SwQZZcs%3D&rev=079528098f5998ba13c88821a2eca1005c1695de Locked URL: https://git.lix.systems/api/v1/repos/lix-project/lix/archive/079528098f5998ba13c88821a2eca1005c1695de.tar.gz?narHash=sha256-pgDJZjj4jpzkFxsqBTI/9Yb0n3gW%2BDvDtuv9SwQZZcs%3D&rev=079528098f5998ba13c88821a2eca1005c1695de Description: Lix: A modern, delicious implementation of the Nix package manager Path: /nix/store/gl8c7im641zwckcchp82fh1cn2w339i5-source Revision: 079528098f5998ba13c88821a2eca1005c1695de Last modified: 2025-01-18 13:04:46 Inputs: ├───flake-compat: github:edolstra/flake-compat/0f9255e01c2351cc7d116c072cb317785dd33b33 │ Last modified: 2023-10-04 06:37:54 ├───nix2container: github:nlewo/nix2container/fa6bb0a1159f55d071ba99331355955ae30b3401 │ Last modified: 2024-08-29 22:48:55 ├───nixpkgs: github:NixOS/nixpkgs/9ecb50d2fae8680be74c08bb0a995c5383747f89 │ Last modified: 2024-12-04 13:42:25 ├───nixpkgs-regression: github:NixOS/nixpkgs/215d4d0fd80ca5163643b03a33fde804a29cc1e2 │ Last modified: 2022-01-24 11:20:45 └───pre-commit-hooks: github:cachix/git-hooks.nix/6f4e2a2112050951a314d2733a994fbab94864c6 Last modified: 2024-12-04 05:28:28 ``` So it took the spec from lix and relocked it! Busted. Here's what it did to the lock file: ``` lix/foo » git cat-file -p HEAD:flake.lock > flake.lock.old lix/foo » json-diff flake.lock.old flake.lock ``` ```diff { nodes: { lix: { inputs: { - nixpkgs: [ - "nixpkgs" - ] + nixpkgs: "nixpkgs" } } nixpkgs: { locked: { - lastModified: 1737226685 + lastModified: 1737672001 - narHash: "sha256-34x0t/x5SkClo04gaG+KPBwN9JtXjFSQGTl//Yry4Gc=" + narHash: "sha256-YnHJJ19wqmibLQdUeq9xzE6CjrMA568KN/lFPuSVs4I=" - rev: "bf68d76e54ac5da0d77f82656a37552996195e80" + rev: "035f8c0853c2977b24ffc4d0a42c74f00b182cd8" } } root: { inputs: { - nixpkgs: "nixpkgs" + nixpkgs: [ + "lix" + "nixpkgs" + ] } } } } ``` ``` nix (Lix, like Nix) 2.93.0-dev-pre20250122-1fe6064 System type: aarch64-darwin Additional system types: x86_64-darwin Features: gc, signed-caches System configuration file: /etc/nix/nix.conf User configuration files: /Users/jade/.config/nix/nix.conf:/etc/xdg/nix/nix.conf Store directory: /nix/store State directory: /nix/var/nix Data directory: /nix/store/xivaab7i0ndb84r0gc46jszfzdfhwimg-lix-2.93.0-dev-pre20250122-1fe6064/share ```

jade added the

bug

Area/flakes

labels

2025-01-24 18:49:13 +00:00

jade commented

2025-01-24 18:54:14 +00:00

Author

Owner

This might be a generic problem with changing follows inputs to non-follows inputs for dependencies? I seem to have gotten it to happen by just renaming nixpkgs to nixpkgs2 in the root inputs and removing the follows line for the dependency.