Docker COPY使用git lfs使Github操作失败 [英] Docker COPY fails Github actions with git lfs

问题描述

我正在使用Github动作来构建git lfs中的文件的docker镜像.
我有以下步骤:

I am using Github actions to build docker images with a file from git lfs.
I have the following step:

     - 
        name: Checkout code
        uses: actions/checkout@v2
        with:
          lfs: true
      - 
        run: head something.json

可以正确打印数据.

在构建阶段从dockerfile运行相同命令时，
我得到以下lfs元数据:

When I run the same command from my dockerfile in the build stage,
I get the following lfs metadata:

#7 [4/5] RUN head something.json
#7 sha256:***
#7 0.138 version https://git-lfs.github.com/spec/v1
#7 0.138 oid sha256:***
#7 0.138 size 1230424
#7 DONE 0.2s

Dockerfile:

Dockerfile:

FROM bitnami/python:3.9.1

COPY . .

RUN head something.json

动作:

jobs:
  build-image:
    runs-on: ubuntu-latest
    steps:
      - 
        name: Checkout code
        uses: actions/checkout@v2
        with:
          lfs: true
      - 
        run: head something.json
      -
        name: Set up QEMU
        uses: docker/setup-qemu-action@v1
      -
        name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1
      -
        name: Build and push
        id: docker_build
        uses: docker/build-push-action@v2
        with:
          push: true
          file: Dockerfile

为什么docker构建采用元数据而不是实际文件?

Why the docker build takes the metadata and not the actual file?

推荐答案

修复

在git checkout之后运行此步骤:

The fix

Run this step after your git checkout:

- run: git lfs pull

并添加到您的docker build操作:

And add to your docker build action:

with:
  context: .

此仓库中的完整示例: https://github.com/roim/docker-行动lfs

Fully working example on this repo: https://github.com/roim/docker-action-lfs

2个独立问题:

1. docker/build-push-action @ v2 中的docker构建未使用您指定的checkout操作中的git repo.您可以通过读取该操作的日志并确认该操作将git repo再次拉入新文件夹来进行确认:

1. The docker build in docker/build-push-action@v2 isn't using the git repo from the checkout action you specified. You can confirm by reading logs for that action and verifying it pulls a git repo again, into a new folder:

/usr/bin/docker buildx build --tag ***/www:latest --iidfile *** --secret id=*** --file ./Dockerfile --push https://github.com/***/www.git#heads/main
#1 [internal] load git source https://github.com/***/www.git#heads/main
#1 sha256:***
#1 0.013 Initialized empty Git repository in /var/lib/buildkit/runc-overlayfs/snapshots/snapshots/1/fs/
#1 0.334 ***    refs/heads/main
#1 0.622 From https://github.com/***/www
#1 0.622  * [new branch]      main       -> heads/main
#1 0.623  * [new branch]      main       -> origin/main

1. 默认的结帐操作似乎来获取LFS对象，但不能在工作目录中解析它们.明确运行 git lfs pull 将解决此问题.

1. The default checkout action seems to fetch LFS objects, but not resolve them in the working directory. Explicitly running git lfs pull will fix that.

-

请注意， 2015年报道了一个长期存在的问题，其中DockerHub不支持git-lfs-特定于DockerHub，而不是github操作.

Note that there is a long standing issue reported in 2015 where DockerHub doesn't support git-lfs--that's specific to DockerHub, not github actions.

关于默认上下文为何不遵循lfs的原因，我打开了一个的新问题.

As to why the default context doesn't respect lfs, I opened a new issue for that.

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