# This Dockerfile and the images produced are for testing headscale,
# and are in no way endorsed by Headscale's maintainers as an
# official nor supported release or distribution.

FROM docker.io/golang:1.25-trixie AS builder
ARG VERSION=dev
ENV GOPATH /go
WORKDIR /go/src/headscale

# Install delve debugger first - rarely changes, good cache candidate
RUN go install github.com/go-delve/delve/cmd/dlv@latest

# Download dependencies - only invalidated when go.mod/go.sum change
COPY go.mod go.sum /go/src/headscale/
RUN go mod download

# Copy source and build - invalidated on any source change
COPY . .

# Build debug binary with debug symbols for delve
RUN CGO_ENABLED=0 GOOS=linux go build -gcflags="all=-N -l" -o /go/bin/headscale ./cmd/headscale

# Runtime stage
FROM debian:trixie-slim

RUN apt-get --update install --no-install-recommends --yes \
    bash ca-certificates curl dnsutils findutils iproute2 jq less procps python3 sqlite3 \
  && apt-get dist-clean

RUN mkdir -p /var/run/headscale

# Copy binaries from builder
COPY --from=builder /go/bin/headscale /usr/local/bin/headscale
COPY --from=builder /go/bin/dlv /usr/local/bin/dlv

# Copy source code for delve source-level debugging
COPY --from=builder /go/src/headscale /go/src/headscale

WORKDIR /go/src/headscale

# Need to reset the entrypoint or everything will run as a busybox script
ENTRYPOINT []
EXPOSE 8080/tcp 40000/tcp
CMD ["dlv", "--listen=0.0.0.0:40000", "--headless=true", "--api-version=2", "--accept-multiclient", "exec", "/usr/local/bin/headscale", "--"]