# Build the manager binary
FROM golang:1.26 AS builder
ARG TARGETOS
ARG TARGETARCH
ARG GIT_COMMIT=unknown

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 (relies on .dockerignore to filter)
COPY . .

# Build
# the GOARCH has no default value to allow the binary to 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 gitea.home.hrajfrisbee.cz/kacerr/egress-proxies-operator/internal/version.Commit=${GIT_COMMIT}" \
    -o manager cmd/main.go

# Use distroless as minimal base image to package the manager binary
# Refer to https://github.com/GoogleContainerTools/distroless for more details
FROM gcr.io/distroless/static:nonroot
ARG GIT_COMMIT=unknown
LABEL org.opencontainers.image.revision="${GIT_COMMIT}"
WORKDIR /
COPY --from=builder /workspace/manager .
USER 65532:65532

ENTRYPOINT ["/manager"]
