kernels lock

Use kernels lock to generate a kernels.lock file that pins kernel dependencies to specific revisions.

Usage

kernels lock <project_dir>

What It Does

Reads kernel dependencies from pyproject.toml under [tool.kernels.dependencies]
Resolves each kernel to its current revision SHA
Writes a kernels.lock file with pinned versions and variant information

Examples

Lock kernels in the current project:

kernels lock .

Lock kernels in a specific project:

kernels lock /path/to/my-project

pyproject.toml Format

Add your kernel dependencies to pyproject.toml:

[tool.kernels.dependencies]
"kernels-community/activation" = 1

The version can be:

A version number (e.g., 1, 2)

kernels.lock Format

The generated lock file contains:

[
  {
    "repo_id": "kernels-community/activation",
    "sha": "ece277f908b9453112722d584fee4b5696f21c49",
    "variants": {
      "torch210-cu128-x86_64-windows": {
        "hash": "sha256-cbf085e1d297d990d9cb074fb5079ff48e9682c729f53a0899a36b5164a6fb45",
        "hash_type": "git_lfs_concat"
      },
      // ...
      "torch29-metal-aarch64-darwin": {
        "hash": "sha256-9f665b54a53246a7d3627422f8a0d41d7956dc5409043dbd14c4ec0327aea310",
        "hash_type": "git_lfs_concat"
      }
    }
  }
]

Workflow

Add dependencies to pyproject.toml
Run kernels lock . to generate the lock file
Commit both pyproject.toml and kernels.lock
Use kernels download . to install locked kernels