# Every stage declares ARG CACHEBUST first: script/ passes a new value
# on every build, which reruns every RUN step after it. The steps that
# compile mount Go's build cache, which survives from build to build.

# Lint phase. script/lint builds it alone. The linter is run directly:
# `make lint` and script/lint are themselves a docker build.
# golangci/golangci-lint:v2.14.0, 2026-10-15
FROM golangci/golangci-lint@sha256:ad862ba6b3798cbe0fd9fd7408d498fd74fbd2623a92406b2fd3898faf0bf98f AS lint
ARG CACHEBUST

# The linter compiles every package, and govips needs the libvips
# headers for that. REPO_POLICIES.md has the lint phase install them
# itself; this image is Debian, so with apt-get rather than apk.
RUN apt-get update \
    && apt-get install -y --no-install-recommends libvips-dev \
    && rm -rf /var/lib/apt/lists/*

WORKDIR /src
COPY go.mod go.sum ./
RUN go mod download
COPY . .
RUN --mount=type=cache,target=/root/.cache/go-build \
    golangci-lint run --config .golangci.yml ./...

# Test phase. script/test builds it alone. -race needs cgo and so a C
# compiler, which the Debian Go image ships and the alpine one does not.
# golang:1.25.4-trixie, 2026-10-15
FROM golang@sha256:a02d35efc036053fdf0da8c15919276bf777a80cbfda6a35c5e9f087e652adfc AS test
ARG CACHEBUST

WORKDIR /src

# script/bootstrap --cgo installs the build dependencies (the libvips
# and libheif headers, and libvips' JPEG XL support, which the tests
# need) and downloads the Go modules.
COPY script/ ./script/
COPY go.mod go.sum ./
RUN script/bootstrap --cgo

COPY . .

# Without -v first; on a failure, again with -v for the details, and
# the step fails even if the second run passes. -count=1 because the
# mounted cache also holds test results, which go test would otherwise
# replay. -parallel 4: by default a package runs as many of its tests at
# once as the host has CPUs, and on a busy host they then wait so long
# to be scheduled that a test that times a request can see it return a
# second late.
RUN --mount=type=cache,target=/root/.cache/go-build \
    go test -count=1 -timeout 90s -race -parallel 4 -cover ./... || \
    { echo "--- Rerunning with -v for details ---"; \
      go test -count=1 -timeout 90s -race -parallel 4 -v ./...; exit 1; }

# Build stage. Nothing is wanted from the two phases above: these copies
# make BuildKit build them first, so this stage runs only when lint and
# test passed.
# golang:1.25.4-alpine3.22, 2026-02-25; the runtime stage uses Alpine 3.22 too
FROM golang:1.25.4-alpine3.22@sha256:d3f0cf7723f3429e3f9ed846243970b20a2de7bae6a5b66fc5914e228d831bbb AS builder
ARG CACHEBUST

COPY --from=lint /src/go.sum /dev/null
COPY --from=test /src/go.sum /dev/null

WORKDIR /src

# Build dependencies, git among them, and Go modules, as in the test
# phase
COPY script/ ./script/
COPY go.mod go.sum ./
RUN script/bootstrap --cgo
# A tar-stream context keeps the sender's file owners, which git refuses.
RUN git config --system --add safe.directory /src

# Copy source code
COPY . .

# The VERSION build arg when one is given, otherwise
# `git describe --tags --always` on the .git in the build context: the
# tag on a tagged commit, tag-N-gHASH after one, the short commit when
# no tag is reachable. With .git present, a version that is still empty,
# dev or unknown fails the build: git is missing or could not read the
# checkout. A context without .git, as from a source tarball, stamps an
# empty version. CGO stays enabled for govips; -trimpath keeps build
# paths out of the binary, and -s -w leave out the symbol table and
# debug information.
ARG VERSION
RUN --mount=type=cache,target=/root/.cache/go-build \
    VERSION="${VERSION:-$(git describe --tags --always)}"; \
    if [ -e .git ]; then \
        case "$VERSION" in ""|dev|unknown) \
            echo "version is '$VERSION' although .git is present" >&2; \
            exit 1 ;; \
        esac; \
    fi; \
    CGO_ENABLED=1 GOTOOLCHAIN=auto go build -trimpath \
        -ldflags="-s -w -X main.Version=${VERSION}" \
        -o /pixad ./cmd/pixad

# Runtime stage, and the last one: a plain `docker build .` builds this
# stage and what it depends on, and nothing else. It must use the Alpine
# release the golang image above is based on, so that pixad runs against
# the libvips and musl it was built with.
# alpine:3.22, 2026-10-08
FROM alpine:3.22@sha256:5291449c3df73caf6ed85e649dec1b9e818b39a5d8c871e97afc13e9cd5e8fa8
ARG CACHEBUST

# Install runtime dependencies only. vips-jxl is libvips' JPEG XL
# support, without which pixad does not start.
RUN apk add --no-cache \
    vips \
    vips-jxl \
    libheif \
    ca-certificates \
    tzdata \
    su-exec

# Copy binary from builder
COPY --from=builder /pixad /usr/local/bin/pixad
COPY deploy/docker-entrypoint.sh /usr/local/bin/docker-entrypoint.sh

# Create non-root user, config directory, and data directory. pixad
# gets uid and gid 65532, which host login and system accounts do not
# use: a bind-mounted /var/lib/pixa is given to pixad, and on the host
# it must not belong to a person's account.
RUN addgroup -g 65532 pixad && \
    adduser -D -H -s /sbin/nologin -u 65532 -G pixad pixad && \
    mkdir -p /var/lib/pixa /etc/pixa && \
    chown pixad:pixad /var/lib/pixa

# No USER: the entrypoint must start as root to give a bind-mounted
# /var/lib/pixa to pixad; it then runs the server as pixad.
WORKDIR /var/lib/pixa

EXPOSE 8080

# Shell form so the probe follows PORT; a port set only in a mounted
# config file is not seen here.
HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
    CMD wget --spider -q "http://localhost:${PORT:-8080}/.well-known/healthcheck.json" || exit 1

# Settings come from PORT and the PIXA_ environment variables; only
# PIXA_SIGNING_KEY is required. A config file mounted at
# /etc/pixa/config.yml is optional and is read when present.
ENTRYPOINT ["/usr/local/bin/docker-entrypoint.sh"]