# Container runtime. Defaults to podman.
container_engine := env("CONTAINER_ENGINE", "podman")

# Space-separated list of registries.
#
# Examples:
#   REGISTRIES="ghcr.io/battlesnake"
#   REGISTRIES="ghcr.io/battlesnake quay.io/battlesnake registry.example.com/battlesnake"
registries := env("REGISTRIES", "")

# Image name
image := env("IMAGE", "")

# Use the exact Git tag when HEAD is tagged.
# Otherwise use the current Git commit SHA.
version := ```
    git describe --tags --exact-match HEAD 2>/dev/null || \
    git rev-parse --short HEAD 2>/dev/null || \
    echo dev
    ```

# Local image reference.
image_ref := image + ":" + version

# ---------------------------------------------------------------------------
# Help
# ---------------------------------------------------------------------------

# Print version that would be used for artifacts.
[group('help')]
version:
    @echo "{{ version }}"

# Print current configuration.
[group('help')]
config:
    @echo "Version:          {{ version }}"
    @echo "Container engine: {{ container_engine }}"
    @echo "Image:            {{ image_ref }}"
    @echo "Registries:"
    @if [ -z "{{ registries }}" ]; then \
        echo "  (none)"; \
    else \
        for registry in {{ registries }}; do \
            echo "  $registry"; \
        done; \
    fi

# Check for environment issues.
[group('help')]
doctor:
    @command -v {{ container_engine }} >/dev/null || { \
        echo "{{ container_engine }} is not installed"; \
        exit 1; \
    }
    @{{ container_engine }} --version
    @echo "Container environment looks good."

# ---------------------------------------------------------------------------
# Containers
# ---------------------------------------------------------------------------

# Build one immutable local image identified by Git tag or commit SHA.
[group('container')]
build:
    {{ container_engine }} build \
        --pull \
        --tag {{ image_ref }} \
        .

# Push the immutable image to every configured registry.
[group('container')]
push: build
    @test -n "{{ registries }}" || { \
        echo "Set REGISTRIES before pushing"; \
        exit 1; \
    }
    @for registry in {{ registries }}; do \
        target="$registry/{{ image_ref }}"; \
        echo "Pushing $target"; \
        {{ container_engine }} tag {{ image_ref }} "$target"; \
        {{ container_engine }} push "$target"; \
    done