magicquarkandLin Jian 0749d7abed emacsPackages.cask: fix import error and use non-vendored dependencies
- Fixes issue 445465.

- Cask expects a local `package-build` directory to be present in the
  output, as it loads a custom version during bootstrap. See:
  https://github.com/cask/cask/blob/master/cask-bootstrap.el#L45

- The vendored version of `package-build` is then used to download from
  `melpa` and `elpa` the dependencies that `cask` requires. This is
  contrary to the philosophy of `nixpkgs` whereby the dependencies
  should be sourced from `nixpkgs` itself.

- To avoid this, the bootstrap process has been patched to provide the
  required dependencies using `nixpkgs`.

- Additionally, `cask-cli` has a function `upgrade-cask` that uses the
  `cask-bootstrap-dir` that its own bootstrap process creates. See
  https://github.com/cask/cask/blob/fd16ea95664b8f13c55b8608dea63942d431ca00/cask-cli.el#L131.
  As the bootstrap process has been modified to use dependencies from
  `nixpkgs`, `cask` can no longer update itself. Therefore, this
  function has been patched to make it effectively a noop.

- The patch cannot be upstreamed as it is specific to the way that
  packages are integrated into `nixpkgs`.
2025-10-01 02:49:45 +08:00

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