cmd/recipe_bootstrap/manifest.go

// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

package main

import (
	"encoding/xml"
	"fmt"
	"io"
	"io/ioutil"
)

type manifest struct {
	XMLName     xml.Name `xml:"manifest"`
	PackageList packages `xml:"packages"`
}

type packages struct {
	XMLName  xml.Name     `xml:"packages"`
	Packages []packageDef `xml:"package"`
}

type packageDef struct {
	XMLName xml.Name `xml:"package"`
	Name    string   `xml:"name,attr"`
	Version string   `xml:"version,attr"`
}

// Resolve the recipes package given a manifest input.
func resolveRecipesPackage(r io.Reader) (*packageDef, error) {
	bytes, err := ioutil.ReadAll(r)
	if err != nil {
		return nil, fmt.Errorf("could not read input")
	}
	var manifest manifest
	err = xml.Unmarshal(bytes, &manifest)
	if err != nil {
		return nil, fmt.Errorf("could not parse input as packages XML")
	}
	for _, pkg := range manifest.PackageList.Packages {
		if pkg.Name != recipesPackageName {
			continue
		}
		return &pkg, nil
	}
	return nil, fmt.Errorf("could not find recipes package")
}