Dockerfile

# ─────────────────────────────────────────────
#  Baadal — Multi-stage Docker Build
# ─────────────────────────────────────────────

# Build stage
FROM golang:1.24-alpine AS builder

WORKDIR /build

# Install build dependencies
RUN apk add --no-cache git ca-certificates tzdata

# Copy go mod files
COPY go.mod go.sum ./
RUN go mod download
RUN go mod verify

# Copy source code
COPY main.go ./

# Build binary
RUN CGO_ENABLED=0 GOOS=linux go build \
    -ldflags="-s -w -X main.version=docker" \
    -a -installsuffix cgo \
    -o baadal main.go

# Runtime stage
FROM alpine:latest

LABEL maintainer="Baadal Team"
LABEL description="Server Log Collector and Alerter"

# Install runtime dependencies
RUN apk --no-cache add \
    ca-certificates \
    tzdata \
    docker-cli \
    coreutils \
    util-linux \
    && rm -rf /var/cache/apk/*

WORKDIR /app

# Copy binary from builder
COPY --from=builder /build/baadal /usr/local/bin/baadal

# Copy config template
COPY config.yml /app/config.yml.template

# Create non-root user
RUN addgroup -g 1000 baadal && \
    adduser -D -u 1000 -G baadal baadal && \
    mkdir -p /var/log/baadal && \
    chown -R baadal:baadal /app /var/log/baadal

# Switch to non-root user (can be overridden for collector mode)
USER baadal

# Expose receiver port
EXPOSE 5170

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
    CMD [ "sh", "-c", "if [ \"$MODE\" = \"receiver\" ]; then wget --no-verbose --tries=1 --spider http://localhost:5170/health || exit 1; else exit 0; fi" ]

# Default to collector mode
ENV MODE=collector

ENTRYPOINT ["baadal"]
CMD ["--mode=${MODE}", "--config=/app/config.yml"]