Dockerfile

# ================================
# Build image
# ================================
FROM swift:5.5.3-focal as build

# Install OS updates and, if needed, sqlite3
RUN export DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true \
    && apt-get -q update \
    && apt-get -q dist-upgrade -y \
    && rm -rf /var/lib/apt/lists/*

# Set up a build area
WORKDIR /build

# First just resolve dependencies.
# This creates a cached layer that can be reused
# as long as your Package.swift/Package.resolved
# files do not change.

# COPY ./Package.* ./
# RUN ls -a

# NIO deps
RUN apt-get update && apt-get install -y wget curl
RUN apt-get update && apt-get install -y libssl-dev libicu-dev

# Copy entire repo into container
COPY . .
RUN swift package resolve -v

# Build everything, with optimizations
RUN swift build -c release --static-swift-stdlib

# Switch to the staging area
WORKDIR /staging

# Copy main executable to staging area
RUN cp -a "$(swift build --package-path /build -c release --show-bin-path)/." ./

# Copy resources to staging area
RUN find -L "$(swift build --package-path /build -c release --show-bin-path)/" -regex '.*\.resources$' -exec cp -a {} ./ \;

# Copy any resources from the public directory and views directory if the directories exist
# Ensure that by default, neither the directory nor any of its contents are writable.
# RUN [ -d /build/Public ] && { mv /build/Public ./Public && chmod -R a-w ./Public; } || true
# RUN [ -d /build/Resources ] && { mv /build/Resources ./Resources && chmod -R a-w ./Resources; } || true

# ================================
# Run image
# ================================
FROM ubuntu:focal

# Make sure all system packages are up to date.
RUN export DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true \
    && apt-get -q update \
    && apt-get -q dist-upgrade -y \
    && apt-get -q install -y \
      ca-certificates \
      tzdata \
# If your app or its dependencies import FoundationNetworking, also install `libcurl4`.
      libcurl4 \
# If your app or its dependencies import FoundationXML, also install `libxml2`.
      # libxml2 \
    && rm -r /var/lib/apt/lists/*


# Create a vapor user and group with /prod as its home directory
RUN useradd --user-group --create-home --system --skel /dev/null --home-dir /prod vapor

# Switch to the new home directory
WORKDIR /prod

# Copy built executable and any staged resources from builder
COPY --from=build --chown=vapor:vapor /staging /prod

# Ensure all further commands run as the vapor user
USER vapor:vapor

# Let Docker bind to port 8080
EXPOSE 8080

# Start the Vapor service when the image is run, default to listening on 8080 in production environment
ENTRYPOINT ["./SlackBot"]
CMD ["serve", "--hostname", "0.0.0.0", "--port", "8080"]