# syntax=docker/dockerfile:experimental
############################
# STEP 1 build web dist - This is built outside of docker and can be reused for other binaries and other docker images too.
# No need to do this in dockerfile
############################
# FROM node:13.8.0-slim as webBuilder
# WORKDIR /web
# COPY ./web /web/

# RUN npm install
# RUN npm run build


############################
# STEP 2 build executable binary
############################
# FROM golang:alpine AS builder
FROM --platform=$BUILDPLATFORM public.ecr.aws/docker/library/golang:1.21 as builder
ARG VERSION
ARG COMMIT_HASH
ARG BUILD_DATE
ARG TARGETOS
ARG TARGETARCH

RUN update-ca-certificates
# RUN apk update && apk add --no-cache git
# Create zincsearch user.
ENV USER=zincsearch
ENV GROUP=zincsearch
ENV UID=10001
ENV GID=10001
# See https://stackoverflow.com/a/55757473/12429735RUN
RUN groupadd --gid "${GID}" "${GROUP}"
RUN adduser \
    --disabled-password \
    --gecos "" \
    --home "/nonexistent" \
    --shell "/sbin/nologin" \
    --no-create-home \
    --uid "${UID}" \
    --gid "${GID}" \
    "${USER}"
# Create default directories for persistent ZincSearch data used in final build stage.
# It follows the Linux filesystem hierarchy pattern
# https://tldp.org/LDP/Linux-Filesystem-Hierarchy/html/var.html
RUN mkdir -p /var/lib/zincsearch /data && chown zincsearch:zincsearch /var/lib/zincsearch /data
WORKDIR $GOPATH/src/github.com/zincsearch/zincsearch/

# Copy the whole repo to the current directory. This includes prebuilt front end assets. in web/dist folder
COPY . .
# COPY --from=webBuilder /web/dist web/dist

# Fetch dependencies.
# Using go get.
RUN go mod tidy
# Using go mod.
# RUN go mod download
# RUN go mod verify
# Build the binary.
# to tackle error standard_init_linux.go:207: exec user process caused "no such file or directory" set CGO_ENABLED=0.
# CGO_ENABLED=0 builds a statically linked binary.
# docs for -ldflags at https://pkg.go.dev/cmd/link
#       -w : Omit the DWARF symbol table.
#       -s : Omit the symbol table and debug information.
#       Omit the symbol table and debug information will reduce the binary size.
# RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-w -s" -o zincsearch cmd/zincsearch/main.go
ENV VERSION=$VERSION
ENV COMMIT_HASH=$COMMIT_HASH
ENV BUILD_DATE=$BUILD_DATE

RUN CGO_ENABLED=0 GOOS=$TARGETOS GOARCH=$TARGETARCH go build -ldflags="-s -w -X github.com/zincsearch/zincsearch/pkg/meta.Version=${VERSION} -X github.com/zincsearch/zincsearch/pkg/meta.CommitHash=${COMMIT_HASH} -X github.com/zincsearch/zincsearch/pkg/meta.BuildDate=${BUILD_DATE}" -o zincsearch cmd/zincsearch/main.go
############################
# STEP 3 build a small image
############################
# FROM public.ecr.aws/lts/ubuntu:latest
FROM scratch
# Import the user and group files from the builder.
COPY --from=builder /etc/passwd /etc/passwd
COPY --from=builder /etc/group /etc/group

# Copy the ssl certificates
COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt

# Copy our static executable.
COPY --from=builder  /go/src/github.com/zincsearch/zincsearch/zincsearch /go/bin/zincsearch

# Create directories that can be used to keep ZincSearch data persistent along with host source or named volumes
COPY --from=builder --chown=zincsearch:zincsearch /var/lib/zincsearch /var/lib/zincsearch
COPY --from=builder --chown=zincsearch:zincsearch /data /data

# Use an unprivileged user.
USER zincsearch:zincsearch
# Port on which the service will be exposed.
EXPOSE 4080
# Run the zincsearch binary.
ENTRYPOINT ["/go/bin/zincsearch"]