预提交Docker: .git文件夹在Docker语言 - compose构建后被删除

Question

我正试图在我的python alpine docker容器中安装预提交钩子，以便我可以通过

运行它们

docker-compose run ... "/py/bin/pre-commit run --all-files"

我先安装git，然后运行git init，然后安装hooks。一切正常，我输入了一个"ls -a"在.git文件夹显示的构建过程中进行调试的命令。

.
..
.flake8
.git
.pre-commit-config.yaml
app
core
manage.py

然而，在构建完成后，我运行

docker-compose run ... "ls -a"

.git文件夹消失了。

因此，运行预提交会产生以下错误:

An error has occurred: FatalError: git failed. Is it installed, and are you in a Git repository directory?
Check the log at /home/django-user/.cache/pre-commit/pre-commit.log
ERROR: 1

下面是我的Dockerfile的完整代码:

FROM python:3.9-alpine3.13
LABEL maintainer="dummy-maintainer"
ENV PYTHONUNBUFFERED 1
# Add the requirements files temporarily to the container
# to intall the python dependencies.
COPY ./requirements.txt /tmp/requirements.txt
COPY ./requirements-dev.txt /tmp/requirements-dev.txt
# Add the app to the container.
COPY ./app /app
# Add the pre-commit configuration to the container.
COPY ./.pre-commit-config.yaml /app/.pre-commit-config.yaml
# Change the working directory to the app directory
WORKDIR /app
# Use port 8000 for communication
EXPOSE 8000
ARG DEV=false
# 1. Create a virtual environment for the python dependencies.
# 2. Install the postgres client and the build dependencies for the postgres python adapter.
# 3. Create a virtual dependencies folder for the build dependencies. (Makes cleaning up easier)
# 4. Install the python dependencies via pip.
# 5. If this is the development mode, install further python dependencies needed for development.
# 6. Furthermore, create an empty git repository to run pre-commit checks on the source code.
RUN python -m venv /py && 
/py/bin/pip install --upgrade pip && 
apk add --update --no-cache postgresql-client && 
apk add --update --no-cache --virtual .tmp-build-deps 
build-base postgresql-dev musl-dev gcc libc-dev linux-headers postgresql-dev libffi-dev && 
/py/bin/pip install -r /tmp/requirements.txt && 
if [ $DEV = "true" ]; 
then /py/bin/pip install -r /tmp/requirements-dev.txt && 
apk add --update --no-cache git && 
git init . && 
/py/bin/pre-commit install-hooks && 
ls -a; 
fi && 
rm -rf /tmp && 
apk del .tmp-build-deps && 
adduser 
--disabled-password 
django-user
# Add the py folder to the path to simplify python commands
ENV PATH="/py/bin:$PATH"
USER django-user

这是我的docker-compose.yml:

version: "3.9"
services:
app:
build:
context: .
args:
- DEV=true
ports:
- "8000:8000"
volumes:
- ./app:/app
command: >
sh -c "python manage.py wait_for_db &&
python manage.py migrate &&
python manage.py runserver 0.0.0.0:8000"
environment:
- DB_HOST=db
- DB_NAME=devdb
- DB_USER=devuser
- DB_PASS=changeme
depends_on:
- db

db:
image: postgres:13-alpine
volumes:
- dev-db-data:/var/lib/postgresql/data
environment:
- POSTGRES_DB=devdb
- POSTGRES_USER=devuser
- POSTGRES_PASSWORD=changeme
volumes:
dev-db-data:

有谁知道问题是什么吗?

Answer 1

volumes:挂载隐藏图像的/app目录中的所有内容，并用主机内容替换它。如果你有一个设置，你的Dockerfile用COPY命令或RUN宁步骤重新组织文件结构来生成文件，你也不能在同一个目录上使用volumes:挂载。

所以在您的情况下，您有一个./.pre-commit-config.yaml文件和一个./app/manage.py脚本。在Dockerfile中，你正在合并这两个目录，所以你有/app/.pre-commit-config.yaml和/app/manage.py;但是随后volumes:将容器的/app目录替换为主机的./app目录，没有预提交文件。

我通常在这里给出的建议是不要试图将所有内容都强行放入Docker空间。在你的主机系统上，你需要普通的开发工具，比如文本编辑器和Web浏览器，你甚至可能已经预装了Python;也安装Git，你就可以直接运行git commit而不需要docker-compose run app包装器。

如果在Docker中只使用工具对你来说很重要，那么你需要使容器文件系统的布局与主机的完全匹配。

FROM python:3.9-alpine
RUN adduser --disabled-password django-user
# Create and switch to a directory to hold the application
WORKDIR /app
# Copy and install the Python-level requirements
COPY requirements*.txt ./
RUN apk add --virtual .build-deps ... 
&& pip install -r requirements.txt 
&& apk del .build-deps
# Copy in the entire source tree
COPY ./ ./
# Explain how to run the container
WORKDIR /app/app
EXPOSE 8000
USER django-user
ENTRYPOINT ["../entrypoint.sh"] # runs wait_for_db, migrate
CMD ["./manage.py", "runserver", "0.0.0.0:8000"]

现在，由于映像具有与主机系统完全相同的布局，您可以绑定挂载整个主机源代码树，也可以仅挂载app子目录。

volumes: ['.:/app']

volumes: ['./app:/app/app']