pinned-package-updater/internal/parser/dockerfile/dockerfile.go

/*
Copyright © 2021 Drew Short <warrick@sothr.com>

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.
*/

// Package dockerfile implements the required components for working with dockerfile image definitions
package dockerfile

import (
	"os"

	log "github.com/sirupsen/logrus"

	buildkitDockerfile "github.com/moby/buildkit/frontend/dockerfile/parser"

	"sothr.com/warricksothr/pinned-package-updater/internal/parser"
)

// Parse reads a Dockerfile, interprets the AST and returns information about the image(s) and package(s) defined
func Parse(dockerfilePath string) (parser.ParseResult, error) {
	dockerfile, err := os.Open(dockerfilePath)
	if err != nil {
		log.Fatalf("Unexpected error reading file %s: %s", dockerfilePath, err)
		return parser.ParseResult{}, err
	}
	defer func(dockerfile *os.File) {
		err := dockerfile.Close()
		if err != nil {
			log.Error("Unexpected error closing file %s: %s", dockerfilePath, err)
		}
	}(dockerfile)

	_, err = buildkitDockerfile.Parse(dockerfile)
	if err != nil {
		log.Fatalf("Unexpected error parsing Dockerfile %s: %s", dockerfilePath, err)
		return parser.ParseResult{}, err
	}

	return parser.ParseResult{}, nil
}