Dockerfile

# syntax=docker/dockerfile:1.5

# Copyright 2021 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Build the manager binary
ARG golang_image
FROM --platform=${BUILDPLATFORM} ${golang_image} as toolchain

# Run this with docker build --build_arg $(go env GOPROXY) to override the goproxy
ARG goproxy=https://proxy.golang.org,direct
ENV GOPROXY=$goproxy

FROM toolchain as builder
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  --mount=type=cache,target=/root/.local/share/golang \
     --mount=type=cache,target=/go/pkg/mod \
     go mod download

# Copy the go source
COPY main.go main.go
COPY api/ api/
COPY controllers/ controllers/
COPY cloud/ cloud/
COPY pkg/ pkg/
COPY util/ util/

# Build
ARG TARGETOS
ARG TARGETARCH
ARG LDFLAGS
RUN --mount=type=cache,target=/root/.cache/go-build \
    --mount=type=cache,target=/go/pkg/mod \
    --mount=type=cache,target=/root/.local/share/golang \
    CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} GO111MODULE=on go build -ldflags "${LDFLAGS} -extldflags '-static'"  -o manager main.go

ARG TARGETPLATFORM
# Use distroless as minimal base image to package the manager binary
# Refer to https://github.com/GoogleContainerTools/distroless for more details
FROM --platform=${TARGETPLATFORM} gcr.io/distroless/static:nonroot
WORKDIR /
COPY --from=builder /workspace/manager .
# Use uid of nonroot user (65532) because kubernetes expects numeric user when applying pod security policies
USER 65532
ENTRYPOINT ["/manager"]