BUILDKIT_CACHE_MOUNT cicd build_error ai_generated true

ERROR: failed to solve: failed to compute cache key: failed to calculate checksum of ref moby::abc123: "/some/path": not found

ID: cicd/docker-buildkit-cache-mount-error

Also available as: JSON · Markdown · 中文
90%Fix Rate
88%Confidence
1Evidence
2023-11-20First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
Docker 24.0.5 active — — —
Docker 25.0.0 active — — —
BuildKit v0.12.0 active — — —

Root Cause

Docker BuildKit cache mount target path does not exist or is invalid, often due to a missing directory in the build context or a typo in the --mount=type=cache,target= path.

generic

中文

Docker BuildKit 缓存挂载目标路径不存在或无效，通常由于构建上下文中缺少目录或 --mount=type=cache,target= 路径拼写错误。

Official Documentation

https://docs.docker.com/build/cache/

Workarounds

  1. 95% success Ensure the cache mount target directory exists in the Dockerfile by adding a RUN mkdir -p /some/path before the cache mount instruction. 
    Ensure the cache mount target directory exists in the Dockerfile by adding a RUN mkdir -p /some/path before the cache mount instruction.
  2. 85% success Use absolute paths and avoid symlinks: change --mount=type=cache,target=/var/cache/apt to a unique path like /cache/apt and ensure no trailing spaces. 
    Use absolute paths and avoid symlinks: change --mount=type=cache,target=/var/cache/apt to a unique path like /cache/apt and ensure no trailing spaces.

中文步骤

  1. Ensure the cache mount target directory exists in the Dockerfile by adding a RUN mkdir -p /some/path before the cache mount instruction.
  2. Use absolute paths and avoid symlinks: change --mount=type=cache,target=/var/cache/apt to a unique path like /cache/apt and ensure no trailing spaces.

Dead Ends

Common approaches that don't work:

  1. 90% fail

    Running docker system prune -a removes all cache but doesn't fix the underlying path issue; cache mounts still fail.

  2. 80% fail

    Adding --no-cache flag forces rebuild but doesn't address the missing directory; error persists on next build.

  3. 50% fail

    Changing the cache mount from type=cache to type=bind may work but defeats caching purpose and can cause permission issues.