Personal CASA Channel Build (`rxue`)¶

pclean depends on a personal conda channel (rxue) that ships a patched CASA build based on the upstream modular release. This channel provides Python 3.12 support and several improvements that are not yet merged into official NRAO releases.

Channel and version¶

Item	Value
Conda channel	`rxue` (`https://conda.anaconda.org/rxue`)
CASA version	Modular 6.7.3.21
Python	3.12

Applied patches¶

The build is assembled from four personal-fork feedstocks hosted under github.com/r-xue. Each repo is a fork of the corresponding conda-forge feedstock with additional patches on a personal branch. The Origin column in each table indicates whether a patch originated in the official conda-forge feedstock or was added by r-xue. Patches that apply only on macOS are marked [osx].

casatools (v6.7.3.21)¶

Source: r-xue/casatools-feedstock — recipe/

Patch file	Origin	Description
`macos-not-gcc.patch` [osx]	conda-forge	Disable the GCC library copy step in `setup.py` on macOS — handled by conda-forge instead.
`expose-par-cubegridding.patch`	r-xue	Add `setcubegridding` method to `SynthesisImager` and extend its XML documentation, enabling per-channel cube-gridding control from Python.
`expose-par-fracbw-cas-14520.patch`	r-xue	CAS-14520 — expose the `fracbw` (fractional-bandwidth) parameter in the `setweighting` Python binding of `SynthesisImager`.
`cas-14761.patch`	r-xue	CAS-14761 — three-part fix targeting cube+standard parallel imaging performance, bundling three upstream tickets: (1) CAS-14759 (@r-xue) — skip the redundant `normalizeprimarybeam()` call in `makePB` on the master process (`imager_base.py`); PB normalisation is already applied per sub-cube in `CubeMajorCycleAlgorithm::task()` in C++. (2) CAS-14758 (@r-xue) — cache the residual, mask and model `image()` tools across the inner `(chan × stokes)` loop in `fill_summary_minor` (`imager_return_dict.py`), removing O(nchan × nstokes) redundant open/close calls per minor-cycle summary. (3) CAS-13898 (@Kitchi) — compute a per-image memory budget in `SDMaskHandler::autoMaskByMultiThreshold` that accounts for gridding overhead, so `TempImage` allocations stay in RAM and do not spill to disk during parallel cube cleaning.

casacpp (v6.7.3.21)¶

Source: r-xue/casacpp-feedstock — recipe/

Patch file	Origin	Description
`versioning.patch`	conda-forge	Remove the `scripts/version` CMake invocation that is not available during conda builds, using the version supplied by the recipe instead.
`protobuf-detection.patch`	conda-forge	Improve gRPC/Protobuf CMake detection so that both distro-packaged and source-compiled installations are found reliably.
`no-copy-unique_ptr.patch` [osx]	conda-forge	Fix the move constructor of `Vi2DataProvider` to use `std::move` on the `unique_ptr` member, silencing a clang error on macOS.

casacore (v3.8.0)¶

Source: r-xue/casacore-feedstock — recipe/

Patch file	Origin	Description
`ncursesw.patch`	conda-forge	Link readline against `ncursesw` instead of `ncurses` to match the wide-character ncurses library name used in conda-forge.
`default-root.patch`	conda-forge	Inject `CONDA_CASA_ROOT` into the CMake definitions so casacore can locate the correct data directory inside the conda prefix.
`ignore-build-env-prefix.patch`	conda-forge	Filter the conda `build_env` path out of `CMAKE_SYSTEM_PREFIX_PATH`, preventing the build environment from polluting host-library discovery.
`boost-python-cmake.patch`	conda-forge	Fix Boost-Python CMake target detection for Boost ≥ 1.67, which changed the component naming scheme.
`clang-link.patch` [osx]	conda-forge	Remove the explicit `PYTHON2_LIBRARIES` entry from the `target_link_libraries` call for `casa_python` to avoid duplicate-symbol errors with clang.
`darwin-gettimeofday.patch` [osx]	conda-forge	Include `<sys/time.h>` on Darwin to resolve the `gettimeofday` declaration when the macOS SDK omits it from `<time.h>`.
`libadios2-macos.patch` [osx]	conda-forge (modified)	Require ADIOS2 ≥ 2.8.0 and request the `C` component on macOS, matching the version available in conda-forge; updated by r-xue for ADIOS2 2.8.0 compatibility.
`adios2stman_slicer_selection.patch`	r-xue	Fix a dimensionality mismatch in `Adios2StManColumn::columnSliceCellsVToSelection` for variable-shape (indirect) columns: resize `itsAdiosStart/Count` to `ndim(Slicer)+1` before calling `ADIOS2 SetSelection()`.
`adios2stman_readrandomaccess.patch`	r-xue	Open Adios2StMan tables with `ReadRandomAccess` mode; track a write-mode flag so `EndStep()` is only called when the engine was opened for writing, eliminating spurious write-lock acquisition.

casatasks (v6.7.3.21)¶

Source: r-xue/casatasks-feedstock — recipe/

Patch file	Origin	Description
`versioning.patch`	conda-forge	Same as in `casacpp` — remove the version-script CMake call that is absent during conda builds.
`cas-14761.patch`	r-xue	CAS-14761 — mirror of the `casatools` patch: apply the same three sub-ticket fixes — CAS-14759 (@r-xue), CAS-14758 (@r-xue), and CAS-13898 (@Kitchi) — to the `casatasks` Python and C++ sources (see `casatools` entry above for full descriptions).

Environment setup¶

Option 1: pixi (recommended)¶

In pyproject.toml (used by this project):

[tool.pixi.workspace]
channels = ["https://conda.anaconda.org/rxue", "conda-forge"]

In a standalone pixi.toml (for lightweight environments outside this project):

[workspace]
name = "micasa"
channels = ["rxue", "conda-forge"]
platforms = ["linux-64", "linux-aarch64", "osx-arm64"]

[dependencies]
conda-ecosystem-user-package-isolation = "*"
python = "3.12.*"
ipython = "*"
pip = ">=23.0"
casatasks = ">=6.7.3"

Install and activate the runtime environment:

pixi install
pixi shell

For development (includes pytest, ruff, etc.):

pixi install -e dev
pixi shell -e dev

Option 2: conda / mamba¶

A standalone environment.yml is provided in the feedstock notes for environments that do not use pixi:

name: micasa
channels:
  - rxue
  - conda-forge
  - nodefaults
dependencies:
  - conda-ecosystem-user-package-isolation
  - python=3.12
  - ipython
  - pip>=23.0
  - casatasks>=6.7.3

Create and activate:

conda env create -f environment.yml
conda activate micasa

Update after changes:

conda env update -f environment.yml --prune

Personal CASA Channel Build (rxue)¶