cdm_reader_mapper fails to install (snappy)

[jtsiddons]

cdm_reader_mapper fails to install with the following error

ERROR: Could not find a version that satisfies the requirement snappy<1.2 (from cdm-reader-mapper) (from versions: 2.2, 2.3, 2.3.1, 2.3.2, 2.4, 2.4.1, 2.4.2, 2.5, 2.5.1, 2.5.2, 2.5.4, 2.6, 2.6.1.post1, 2.7, 2.8, 3.0, 3.0.1, 3.0.2, 3.0.3, 3.1, 3.1.1)
ERROR: No matching distribution found for snappy<1.2

(or similar depending on python version). The failure is from the dependency snappy.

Steps to reproduce:

docker run --rm -it python:3.11-slim-bookworm bash
apt update
apt install git gcc
git clone https://github.com/glamod/cdm_reader_mapper.git cdm_reader_mapper
cd cdm_reader_mapper
python -m venv venv
source ./venv/bin/activate
pip install .

I have tested this with python versions 3.9.12, 3.11.9, and 3.12.3. All get similar errors (referencing ERROR: No matching distribution found for snappy<1.2).

[ludwiglierhammer]

@jtsiddons: I added snappy to the requirements because of this issue. Unforunately, you can install snappy<1.2 with conda but not with pip. In the meantime I think the issue was closed. Thus we can abstain from snappy<1.2.

Would you please make a new PR and test the installation and the code without snappy in the requirements. I hope cdm_reader_mapper runs without snappy as a dependency.

[ludwiglierhammer]

snappy on pip is not the snappy we need. There is an old snappy version (0.7.1) on pip called python-snappy.

[ludwiglierhammer]

Many thanks for this bug fix.