# docker automated build gets shallow copy but non-shallow copy cannot be unshallowedRUN git fetch --unshallow true 是干嘛用的

RUN git fetch --unshallow || true is used in a Dockerfile to perform an "unshallow" fetch of a git repository during the automated build process.

By default, when performing a git clone in a Dockerfile, it creates a shallow copy of the repository. A shallow copy only includes the latest commit and a limited number of previous commits, which helps to reduce the size and cloning time of the repository.

However, in some cases, you may need access to the full history of the repository during the build process. By using git fetch --unshallow, you can convert the shallow copy into a complete copy, fetching all the missing commits and branches.

The || true part is used to prevent the build process from failing if the repository is already unshallowed or if the git fetch command encounters any errors. It ensures that the build process continues even if the unshallow fetch fails.

Overall, this command is used to ensure that the Docker build process has access to the complete history of the git repository, if needed