Quickly clone a git repository without the history
By Mike Street
We were recently building a docker image which needed to include some code we have stored in a Git repository. To ensure the code was the most up-to-date, we include a
git clone during the build process.
To avoid bundling a huge
.git folder within our Docker image, you can specify a
--depth when cloning. This clones the specified number of commits in the history. This example has just 1 commit in the log.
git clone --depth 1 [email protected]:path/to/repo.git
You can specify a branch, or a tag, to clone from too. In our build, we pass in a version via a Docker argument.
git clone -b $CODE_VERSION --depth 1 [email protected]:path/to/repo.git /path/to/folder
When building the Docker image, we then pass in the argument:
docker build --build-arg CODE_VERSION="1.2.1"
As an anecdote, I ran the above commands with the React library.
git cloneis 217 MB (and took about 2 minutes)
git clone --depth 1is 32.8 MB (and took about 7 seconds)
You can see that if you only cared about getting the code and not the full history, the
--depth attribute could save you time and space.