Cannot build devcontainers features
评估
调研方向
首先使用 Podman 和所示的 podman-remote buildx 命令复现报告中的 VS Code Flatpak 设置。调查为什么 /tmp/devcontainercli-user/container-features/... 对主机端的 Podman 构建不可用，而 Dockerfile 和构建上下文却是从 Flatpak 环境传递过来的。在此设置中成功构建 dev container features 即表示完成。
由索引模型根据 Issue 内容生成。
描述
When using vscode on Flatpak with podman and devcontainers as suggested here, builing of devcontainer feature fails.
The cause is that this involves building a container image with a build context which is not shared with the host:
[1/2] STEP 3/4: COPY --from=dev_containers_feature_content_source devcontainer-features.builtin.env /tmp/build-features/
Error: building at STEP "COPY --from=dev_containers_feature_content_source devcontainer-features.builtin.env /tmp/build-features/": checking on sources under "/tmp/devcontainercli-user/container-features/0.79.0-1753825289342": error in copier subprocess: changing to intended-new-root directory "/tmp/devcontainercli-user/container-features/0.79.0-1753825289342": chdir /tmp/devcontainercli-user/container-features/0.79.0-1753825289342: no such file or directory
Stop (729 ms): Run: podman-remote buildx build --load --build-context dev_containers_feature_content_source=/tmp/devcontainercli-user/container-features/0.79.0-1753825289342 --no-cache --build-arg _DEV_CONTAINERS_BASE_IMAGE=mcr.microsoft.com/devcontainers/go:1-1.23-bookworm --build-arg _DEV_CONTAINERS_IMAGE_USER=root --build-arg _DEV_CONTAINERS_FEATURE_CONTENT_SOURCE=dev_container_feature_content_temp --target dev_containers_target_stage -f /tmp/devcontainercli-user/container-features/0.79.0-1753825289342/Dockerfile.extended -t vsc-mycode-e878bb43015990a9f48c5b2226813a3b60f7a9ab826928aad91c912747c3bc3c-features /var/home/user/.var/app/com.visualstudio.code/config/Code/User/globalStorage/ms-vscode-remote.remote-containers/data/empty-folder
Error: Command failed: podman-remote buildx build --load --build-context dev_containers_feature_content_source=/tmp/devcontainercli-user/container-features/0.79.0-1753825289342 --no-cache --build-arg _DEV_CONTAINERS_BASE_IMAGE=mcr.microsoft.com/devcontainers/go:1-1.23-bookworm --build-arg _DEV_CONTAINERS_IMAGE_USER=root --build-arg _DEV_CONTAINERS_FEATURE_CONTENT_SOURCE=dev_container_feature_content_temp --target dev_containers_target_stage -f /tmp/devcontainercli-user/container-features/0.79.0-1753825289342/Dockerfile.extended -t vsc-mycode-e878bb43015990a9f48c5b2226813a3b60f7a9ab826928aad91c912747c3bc3c-features /var/home/user/.var/app/com.visualstudio.code/config/Code/User/globalStorage/ms-vscode-remote.remote-containers/data/empty-folder
Here, the failing command is:
podman-remote buildx build --load \
--build-context dev_containers_feature_content_source=/tmp/devcontainercli-user/container-features/0.79.0-1753825289342 \
--no-cache \
--build-arg _DEV_CONTAINERS_BASE_IMAGE=mcr.microsoft.com/devcontainers/go:1-1.23-bookworm \
--build-arg _DEV_CONTAINERS_IMAGE_USER=root \
--build-arg _DEV_CONTAINERS_FEATURE_CONTENT_SOURCE=dev_container_feature_content_temp \
--target dev_containers_target_stage \
-f /tmp/devcontainercli-user/container-features/0.79.0-1753825289342/Dockerfile.extended \
-t vsc-mycode-e878bb43015990a9f48c5b2226813a3b60f7a9ab826928aad91c912747c3bc3c-features \
/var/home/user/.var/app/com.visualstudio.code/config/Code/User/globalStorage/ms-vscode-remote.remote-containers/data/empty-folder
and it fails because the build context is not accessible from the host, where podman is running.
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