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# This Dockerfile sets up a simple SSH server for hosting git repositories. It installs the necessary packages, creates the required directories, and configures SSH to allow access using authorized keys.
# Start with a base Debian image
FROM debian:13.4
# Install dependencies and clean up apt cache to reduce image size
RUN apt-get update && apt-get install -y --no-install-recommends \
openssh-server \
git \
cron \
jq \
&& rm -rf /var/lib/apt/lists/*
# Create the privilage separation directory as openssh-server post-install script doesn't do it in docker build context
RUN mkdir -p /var/run/sshd
# Create a git user and set up the home directory
RUN useradd -m -s /bin/bash git
# Create the repositories directory and set appropriate permissions
RUN mkdir -p /repositories && chown git:git /repositories
# Disallow password authentication for security reasons
RUN echo "PasswordAuthentication no" >> /etc/ssh/sshd_config
# Copy the entrypoint script into the container
COPY entrypoint.bash /
# Copy cron jobs
COPY etc/cron.d/* /etc/cron.d/
# Set appropriate permissions for the cron jobs
RUN chmod 0644 /etc/cron.d/*
# Copy scripts
COPY scripts/* /scripts/
# Set appropriate permissions for the scripts
RUN chmod +x /scripts/*
# Copy git home overlay
COPY home/git/* /home/git/
# Copy git-wrapper
COPY usr/local/bin/git-wrapper /usr/local/bin/git-wrapper
# Set appropriate permissions for the git-wrapper
RUN chmod +x /usr/local/bin/git-wrapper
# Add our git-wrapper to a new Match block in the sshd_config
RUN echo "Match User git" >> /etc/ssh/sshd_config && \
echo " ForceCommand /usr/local/bin/git-wrapper" >> /etc/ssh/sshd_config
# Make the entrypoint script executable
RUN chmod +x /entrypoint.bash
# Expose port 22 for SSH access
EXPOSE 22
# Define our entrypoint
ENTRYPOINT [ "/entrypoint.bash" ]
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