git-sync is a simple command that pulls a git repository into a local directory. It is a perfect "sidecar" container in Kubernetes - it can periodically pull files down from a repository so that an application can consume them.
git-sync can pull one time, or on a regular inteval. It can pull from the HEAD
of a branch, or from a git tag, or from a specific git hash. It will only
re-pull if the target of the run has changed in the upstream repository. When
it re-pulls, it updates the destination directory atomically. In order to do
this, it uses a git worktree in a subdirectory of the --root and flips a
symlink.
# build the container
make container REGISTRY=registry TAG=tag
# run the container
docker run -d \
-v /tmp/git-data:/git \
registry/git-sync:tag \
--repo=https://github.com/kubernetes/git-sync
--branch=master
--wait=30
# run an nginx container to serve the content
docker run -d \
-p 8080:80 \
-v /tmp/git-data:/usr/share/nginx/html \
nginx