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#!/usr/bin/env bash
set -euo pipefail
usage() {
sed -n '2,22p' "$0"
}
# Build and publish a Docker image with buildx.
#
# Usage:
# publish.sh --registry HOST --repository PATH --tag TAG --platform PLATFORMS [options]
#
# Options:
# --registry HOST Registry host, without a URL scheme
# --repository PATH Repository path, such as team/service
# --tag TAG Image tag
# --platform LIST Comma-separated platforms
# --file PATH Dockerfile path (default: Dockerfile)
# --context PATH Build context (default: .)
# --builder NAME Existing buildx builder
# --load Load a single-platform image instead of pushing
# --dry-run Print the resolved build without executing it
# --help Show this help
registry=
repository=
tag=
platform=
dockerfile=Dockerfile
build_context=.
builder=
mode=push
dry_run=false
while (($#)); do
case "$1" in
--registry) registry=${2-}; shift 2 ;;
--repository) repository=${2-}; shift 2 ;;
--tag) tag=${2-}; shift 2 ;;
--platform) platform=${2-}; shift 2 ;;
--file) dockerfile=${2-}; shift 2 ;;
--context) build_context=${2-}; shift 2 ;;
--builder) builder=${2-}; shift 2 ;;
--load) mode=load; shift ;;
--dry-run) dry_run=true; shift ;;
--help|-h) usage; exit 0 ;;
*) printf 'Unknown argument: %s\n' "$1" >&2; usage >&2; exit 2 ;;
esac
done
for required_name in registry repository tag platform; do
if [[ -z ${!required_name} ]]; then
printf 'Missing required option: --%s\n' "$required_name" >&2
exit 2
fi
done
if [[ $registry == *://* || $registry == */* ]]; then
printf '%s\n' 'Registry must be a host without a URL scheme or path.' >&2
exit 2
fi
if [[ $repository == /* || $repository == */ || $repository != */* ]]; then
printf '%s\n' 'Repository must look like namespace/image.' >&2
exit 2
fi
if [[ $tag == *:* || $tag == */* ]]; then
printf '%s\n' 'Tag must not contain ":" or "/".' >&2
exit 2
fi
if [[ $mode == load && $platform == *,* ]]; then
printf '%s\n' '--load supports only one platform.' >&2
exit 2
fi
if [[ ! -f $dockerfile ]]; then
printf 'Dockerfile not found: %s\n' "$dockerfile" >&2
exit 2
fi
if [[ ! -d $build_context ]]; then
printf 'Build context not found: %s\n' "$build_context" >&2
exit 2
fi
if [[ $dry_run == false ]] && ! command -v docker >/dev/null 2>&1; then
printf '%s\n' 'docker is not installed or not available in PATH.' >&2
exit 127
fi
image_ref="${registry}/${repository}:${tag}"
build_cmd=(docker buildx build --file "$dockerfile" --platform "$platform" --tag "$image_ref")
if [[ -n $builder ]]; then
build_cmd+=(--builder "$builder")
fi
if [[ $mode == push ]]; then
build_cmd+=(--push)
else
build_cmd+=(--load)
fi
build_cmd+=("$build_context")
printf 'Image: %s\n' "$image_ref"
printf 'Platform: %s\n' "$platform"
printf 'Dockerfile: %s\n' "$dockerfile"
printf 'Context: %s\n' "$build_context"
printf 'Mode: %s\n' "$mode"
if [[ $dry_run == true ]]; then
printf 'Command:'
printf ' %q' "${build_cmd[@]}"
printf '\n'
exit 0
fi
"${build_cmd[@]}"
if [[ $mode == push ]]; then
docker buildx imagetools inspect "$image_ref"
fi