Dockerfile

# Build the guacamole binary
FROM docker.io/library/golang:1.22.0@sha256:4a3e85e88ca4edb571679a3e8b86aaef16ad65134d3aba68760741a850d69f41 as builder
ARG TARGETOS
ARG TARGETARCH
ARG PACKAGE=github.com/padok-team/guacamole
ARG VERSION
ARG COMMIT_HASH
ARG BUILD_TIMESTAMP

WORKDIR /workspace
# Copy the Go Modules manifests
COPY go.mod go.mod
COPY go.sum go.sum
# cache deps before building and copying source so that we don't need to re-download as much
# and so that source changes don't invalidate our downloaded layer
RUN go mod download

# Copy the go source
COPY checks/ checks/
COPY cmd/ cmd/
COPY data/ data/
COPY helpers/ helpers/
COPY internal/ internal/
COPY main.go main.go

# Build
# the GOARCH has not a default value to allow the binary be built according to the host where the command
# was called. For example, if we call make docker-build in a local env which has the Apple Silicon M1 SO
# the docker BUILDPLATFORM arg will be linux/arm64 when for Apple x86 it will be linux/amd64. Therefore,
# by leaving it empty we can ensure that the container and binary shipped on it will have the same platform.
RUN CGO_ENABLED=0 GOOS=${TARGETOS:-linux} GOARCH=${TARGETARCH} go build -a \
  -ldflags="\
  -X ${PACKAGE}/internal/version.Version=${VERSION} \
  -X ${PACKAGE}/internal/version.CommitHash=${COMMIT_HASH} \
  -X ${PACKAGE}/internal/version.BuildTimestamp=${BUILD_TIMESTAMP}" \
  -o bin/guacamole main.go

FROM docker.io/library/alpine:3.19.1@sha256:c5b1261d6d3e43071626931fc004f70149baeba2c8ec672bd4f27761f8e1ad6b

WORKDIR /home/guacamole

# Install required packages
# RUN apk add --update --no-cache git bash openssh

ENV UID=65532
ENV GID=65532
ENV USER=guacamole
ENV GROUP=guacamole

# Create a non-root user to run the app
RUN addgroup \
  -g $GID \
  $GROUP && \
  adduser \
  --disabled-password \
  --no-create-home \
  --home $(pwd) \
  --uid $UID \
  --ingroup $GROUP \
  $USER

# Copy the binary to the production image from the builder stage
COPY --from=builder /workspace/bin/guacamole /usr/local/bin/guacamole

RUN chmod +x /usr/local/bin/guacamole

# Use an unprivileged user
USER 65532:65532

# Run guacamole on container startup
ENTRYPOINT ["guacamole"]