`devbox shell` command fails on x86_64-darwin: "nixpkgs 26.11 has dropped support for x86_64-darwin"

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难度
4/5
预计耗时
3-5 天
新手友好度
48/100
Issue 类型
缺陷
描述清晰度
描述清楚
活跃度
活跃
技术栈
shell
领域
build-system, tooling

调研方向

Start by tracing how Devbox selects the nixpkgs revision used to generate .devbox/gen/flake/flake.nix for the x86_64-darwin system; the issue provides that generated file and a working nixpkgs-26.05-darwin commit as references. Check the relevant tests for platform-specific revision selection, then verify that devbox shell succeeds on Intel macOS without a manual nixpkgs.commit pin.

由索引模型根据 Issue 内容生成。

描述

bug looks easy p2 processed triage
What happened?

On x86_64-darwin, devbox shell fails in both existing projects and newly initialized ones. It fails even when packages is empty, so Devbox is currently unusable on this platform.

devbox shell
Info: Ensuring packages are installed.
✓ Computed the Devbox environment.
Error: nix: command error: nix --extra-experimental-features ca-derivations --option experimental-features 'nix-command flakes fetch-closure' print-dev-env --json path:~/ws/nix-fix-x86darwin/.devbox/gen/flake: Nixpkgs 26.11 has dropped support for x86_64-darwin.: exit code 1

The generated .devbox/gen/flake/flake.nix pins a nixpkgs revision from the
26.11 line, which no longer supports this platform:

{
   description = "A devbox shell";

   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/38a4887411571457d700c51c64a6e49ead2ed5ab?narHash=sha256-kh35kIx7el4Jk8Ki3BH9%2FPn1eZYSYLJ6LMALos0zOy0%3D";
   };

   outputs = {
     self,
     nixpkgs,
   }:
      let
        pkgs = nixpkgs.legacyPackages.x86_64-darwin;
      in
      {
        devShells.x86_64-darwin.default = pkgs.mkShell {
          buildInputs = [
          ];
        };
      };
 }

As a local workaround, adding "nixpkgs.commit": "329c3d2af6d1b618705150ea39f72c15eb4e613e" that indicates current nixpkgs-26.05-darwin branch to the devbox.json.

{
   "$schema": "https://raw.githubusercontent.com/jetify-com/devbox/0.17.5/.schema/devbox.schema.json",
   "packages": [],
   "shell": {
     "init_hook": [
       "echo 'Welcome to devbox!' > /dev/null"
     ],
     "scripts": {
       "test": [
         "echo \"Error: no test specified\" && exit 1"
       ]
     }
+  },
+  "nixpkgs": {
+    "commit": "329c3d2af6d1b618705150ea39f72c15eb4e613e"
   }
 }

.devbox/gen/flake/flake.nix generated from the devbox.json above

{
   description = "A devbox shell";

   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/329c3d2af6d1b618705150ea39f72c15eb4e613e";
   };

   outputs = {
     self,
     nixpkgs,
   }:
      let
        pkgs = nixpkgs.legacyPackages.x86_64-darwin;
      in
      {
        devShells.x86_64-darwin.default = pkgs.mkShell {
          buildInputs = [
          ];
        };
      };
 }

Could Devbox select a nixpkgs-26.05-darwin revision for x86_64-darwin, so that existing projects keep working without each user pinning nixpkgs.commit by hand?
Nixpkgs 26.05 is supported until the end of 2026, so this would cover the remaining lifetime of the platform.

See:
https://github.com/NixOS/nixpkgs/blob/38a4887411571457d700c51c64a6e49ead2ed5ab/doc/release-notes/rl-2611.section.md

Steps to reproduce
  1. devbox init on x86_64-darwin system.
  2. devbox shell
Command

shell

devbox.json
Devbox version

0.17.5

Nix version

No response

What system does this bug occur on?

macOS (Intel)

Debug logs

No response

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  3. Fork 仓库，在一个分支上完成修改。
  4. 提交 Pull Request，并在描述里引用这个 Issue 编号。

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