python - 检查 Makefile 中是否存在 conda 环境

Question

我正在 Makefile 中创建 conda 环境。但是，如果已经创建了此环境，我想跳过该步骤。我如何检查以下内容:

1. 是否已有同名的环境？简单的目录检查就足够了吗？
2. 此环境是否已激活？选修的。我认为，如果 env 被激活两次也没什么坏处。

CONDA_ENV_NAME := myname

ifeq (,$(shell which conda))
    HAS_CONDA=False
else
    HAS_CONDA=True
    CONDA_ACTIVATE=source $$(conda info --base)/etc/profile.d/conda.sh ; conda activate ; conda activate
endif

environment:
ifeq (True,$(HAS_CONDA))
    @echo ">>> Detected conda, creating conda environment."
    ## Here I'd like to check if this environment already exists
    conda env create -f environment.yml -n $(CONDA_ENV_NAME)
    ## ... and if the env should be activated (optional)
    $(CONDA_ACTIVATE) $(CONDA_ENV_NAME)
else
    @echo ">>> Install conda first."
endif

Answer 1

我通过以下方法解决了问题:

ifeq (,$(shell which conda))
    HAS_CONDA=False
else
    HAS_CONDA=True
    ENV_DIR=$(shell conda info --base)
    MY_ENV_DIR=$(ENV_DIR)/envs/$(CONDA_ENV_NAME)
    CONDA_ACTIVATE=source $$(conda info --base)/etc/profile.d/conda.sh ; conda activate ; conda activate
endif

environment:
ifeq (True,$(HAS_CONDA))
ifneq ("$(wildcard $(MY_ENV_DIR))","") # check if the directory is there
    @echo ">>> Found $(CONDA_ENV_NAME) environment in $(MY_ENV_DIR). Skipping installation..."
else
    @echo ">>> Detected conda, but $(CONDA_ENV_NAME) is missing in $(ENV_DIR). Installing ..."
    conda env create -f environment.yml -n $(CONDA_ENV_NAME)
endif
else
    @echo ">>> Install conda first."
    exit
endif