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/*
Copyright 2018 Google, Inc. All rights reserved.
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 differs
import (
"errors"
"strings"
pkgutil "github.com/GoogleContainerTools/container-diff/pkg/util"
"github.com/GoogleContainerTools/container-diff/util"
"github.com/sirupsen/logrus"
)
type MultiVersionPackageAnalyzer interface {
getPackages(image pkgutil.Image) (map[string]map[string]util.PackageInfo, error)
Name() string
}
type SingleVersionPackageAnalyzer interface {
getPackages(image pkgutil.Image) (map[string]util.PackageInfo, error)
Name() string
}
type SingleVersionPackageLayerAnalyzer interface {
getPackages(image pkgutil.Image) ([]map[string]util.PackageInfo, error)
Name() string
}
func multiVersionDiff(image1, image2 pkgutil.Image, differ MultiVersionPackageAnalyzer) (*util.MultiVersionPackageDiffResult, error) {
pack1, err := differ.getPackages(image1)
if err != nil {
return &util.MultiVersionPackageDiffResult{}, err
}
pack2, err := differ.getPackages(image2)
if err != nil {
return &util.MultiVersionPackageDiffResult{}, err
}
diff := util.GetMultiVersionMapDiff(pack1, pack2)
return &util.MultiVersionPackageDiffResult{
Image1: image1.Source,
Image2: image2.Source,
DiffType: strings.TrimSuffix(differ.Name(), "Analyzer"),
Diff: diff,
}, nil
}
func singleVersionDiff(image1, image2 pkgutil.Image, differ SingleVersionPackageAnalyzer) (*util.SingleVersionPackageDiffResult, error) {
pack1, err := differ.getPackages(image1)
if err != nil {
return &util.SingleVersionPackageDiffResult{}, err
}
pack2, err := differ.getPackages(image2)
if err != nil {
return &util.SingleVersionPackageDiffResult{}, err
}
diff := util.GetMapDiff(pack1, pack2)
return &util.SingleVersionPackageDiffResult{
Image1: image1.Source,
Image2: image2.Source,
DiffType: strings.TrimSuffix(differ.Name(), "Analyzer"),
Diff: diff,
}, nil
}
// singleVersionLayerDiff returns an error as this diff is not supported as
// it is far from obvious to define it in meaningful way
func singleVersionLayerDiff(image1, image2 pkgutil.Image, differ SingleVersionPackageLayerAnalyzer) (*util.SingleVersionPackageLayerDiffResult, error) {
logrus.Warning("'diff' command for packages on layers is not supported, consider using 'analyze' on each image instead")
return &util.SingleVersionPackageLayerDiffResult{}, errors.New("Diff for packages on layers is not supported, only analysis is supported")
}
func multiVersionAnalysis(image pkgutil.Image, analyzer MultiVersionPackageAnalyzer) (*util.MultiVersionPackageAnalyzeResult, error) {
pack, err := analyzer.getPackages(image)
if err != nil {
return &util.MultiVersionPackageAnalyzeResult{}, err
}
analysis := util.MultiVersionPackageAnalyzeResult{
Image: image.Source,
AnalyzeType: strings.TrimSuffix(analyzer.Name(), "Analyzer"),
Analysis: pack,
}
return &analysis, nil
}
func singleVersionAnalysis(image pkgutil.Image, analyzer SingleVersionPackageAnalyzer) (*util.SingleVersionPackageAnalyzeResult, error) {
pack, err := analyzer.getPackages(image)
if err != nil {
return &util.SingleVersionPackageAnalyzeResult{}, err
}
analysis := util.SingleVersionPackageAnalyzeResult{
Image: image.Source,
AnalyzeType: strings.TrimSuffix(analyzer.Name(), "Analyzer"),
Analysis: pack,
}
return &analysis, nil
}
// singleVersionLayerAnalysis returns the packages included, deleted or
// updated in each layer
func singleVersionLayerAnalysis(image pkgutil.Image, analyzer SingleVersionPackageLayerAnalyzer) (*util.SingleVersionPackageLayerAnalyzeResult, error) {
pack, err := analyzer.getPackages(image)
if err != nil {
return &util.SingleVersionPackageLayerAnalyzeResult{}, err
}
var pkgDiffs []util.PackageDiff
// Each layer with modified packages includes a complete list of packages
// in its package database. Thus we diff the current layer with the
// previous one that contains a package database. Layers that do not
// include a package database are omitted.
preInd := -1
for i := range pack {
var pkgDiff util.PackageDiff
if preInd < 0 && len(pack[i]) > 0 {
pkgDiff = util.GetMapDiff(make(map[string]util.PackageInfo), pack[i])
preInd = i
} else if preInd >= 0 && len(pack[i]) > 0 {
pkgDiff = util.GetMapDiff(pack[preInd], pack[i])
preInd = i
}
pkgDiffs = append(pkgDiffs, pkgDiff)
}
return &util.SingleVersionPackageLayerAnalyzeResult{
Image: image.Source,
AnalyzeType: strings.TrimSuffix(analyzer.Name(), "Analyzer"),
Analysis: util.PackageLayerDiff{
PackageDiffs: pkgDiffs,
},
}, nil
}