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116 lines
3.4 KiB
116 lines
3.4 KiB
/*
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Copyright © 2021 Drew Short <warrick@sothr.com>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Package parser implements the required components for working with image definitions
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package parser
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import (
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"errors"
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"fmt"
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log "github.com/sirupsen/logrus"
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)
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// ParseResult is the standard representation for am image declaration
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type ParseResult struct {
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Stages []*Stage
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}
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// Stage is the representation of a stage in the image declaration
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type Stage struct {
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Name string
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Image *Image
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Repositories []*Repository
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Packages []*Package
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}
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// Image is the representation of the reference to a container image layer
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type Image struct {
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Name string
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Tag string
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}
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// Package is the representation of an installed pinned package defined in an image stage declaration
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type Package struct {
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Name string
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Version string
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}
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// Repository is the representation of an added repository defined in a stage declaration
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type Repository struct {
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Information string
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}
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// CommandParserType represents the recognized type of parser usable for a specific image
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type CommandParserType int
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const (
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CommandParserTypeDebian CommandParserType = iota
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)
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// CommandParserTypeIds is a lookup map between CommandParserType and a representation string
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var commandParserTypeIds = map[CommandParserType][]string{
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CommandParserTypeDebian: {"debian"},
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}
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func lookupCommandParserTypeName(parserType CommandParserType) string {
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if parserTypeName, ok := commandParserTypeIds[parserType]; ok {
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return parserTypeName[0]
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} else {
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return "UNKNOWN"
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}
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}
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var availableCommandParsers = map[CommandParserType]CommandParser{}
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// CommandParser handles parsing commands from RUN arguments dependent on the base image type
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type CommandParser interface {
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GetRepositories(runCommand string) ([]*Repository, error)
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GetPinnedPackages(runCommand string) ([]*Package, error)
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}
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// InitCommandParsers exposes functionality to configure the behavior of mapping images to a CommandParser
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func InitCommandParsers() error {
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// Registering known parsers
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availableCommandParsers[CommandParserTypeDebian] = newDebianCommandParser()
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return nil
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}
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func GetCommandParser(image Image) (*CommandParser, error) {
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parserType, determineParserErr := determineParserForImage(image)
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if determineParserErr != nil {
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log.Fatalf("Failed to determine a matching CommandParser for %s: %s", image, determineParserErr)
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return nil, determineParserErr
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}
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if requestedCommandParser, ok := availableCommandParsers[parserType]; ok {
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return &requestedCommandParser, nil
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} else {
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message := fmt.Sprintf("Unable to identify parser for %s", lookupCommandParserTypeName(parserType))
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log.Fatal(message)
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return nil, errors.New(message)
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}
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}
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// determineParserForImage matches image information to the correct CommandParserType
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func determineParserForImage(_ Image) (CommandParserType, error) {
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// TODO: Map image information to the list of command parsers supported
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return CommandParserTypeDebian, nil
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}
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