134 lines
3.6 KiB
Go
134 lines
3.6 KiB
Go
// Copyright 2019 Google Inc. All rights reserved.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package main
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import (
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"bytes"
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"fmt"
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)
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// compareTargetFiles takes two ZipArtifacts and compares the files they contain by examining
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// the path, size, and CRC of each file.
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func compareTargetFiles(priZip, refZip ZipArtifact, artifact string, allowLists []allowList, filters []string) (zipDiff, error) {
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priZipFiles, err := priZip.Files()
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if err != nil {
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return zipDiff{}, fmt.Errorf("error fetching target file lists from primary zip %v", err)
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}
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refZipFiles, err := refZip.Files()
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if err != nil {
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return zipDiff{}, fmt.Errorf("error fetching target file lists from reference zip %v", err)
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}
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priZipFiles, err = filterTargetZipFiles(priZipFiles, artifact, filters)
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if err != nil {
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return zipDiff{}, err
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}
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refZipFiles, err = filterTargetZipFiles(refZipFiles, artifact, filters)
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if err != nil {
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return zipDiff{}, err
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}
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// Compare the file lists from both builds
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diff := diffTargetFilesLists(refZipFiles, priZipFiles)
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return applyAllowLists(diff, allowLists)
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}
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// zipDiff contains the list of files that differ between two zip files.
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type zipDiff struct {
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modified [][2]*ZipArtifactFile
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onlyInA, onlyInB []*ZipArtifactFile
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}
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// String pretty-prints the list of files that differ between two zip files.
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func (d *zipDiff) String() string {
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buf := &bytes.Buffer{}
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must := func(n int, err error) {
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if err != nil {
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panic(err)
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}
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}
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var sizeChange int64
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if len(d.modified) > 0 {
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must(fmt.Fprintln(buf, "files modified:"))
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for _, f := range d.modified {
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must(fmt.Fprintf(buf, " %v (%v bytes -> %v bytes)\n", f[0].Name, f[0].UncompressedSize64, f[1].UncompressedSize64))
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sizeChange += int64(f[1].UncompressedSize64) - int64(f[0].UncompressedSize64)
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}
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}
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if len(d.onlyInA) > 0 {
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must(fmt.Fprintln(buf, "files removed:"))
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for _, f := range d.onlyInA {
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must(fmt.Fprintf(buf, " - %v (%v bytes)\n", f.Name, f.UncompressedSize64))
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sizeChange -= int64(f.UncompressedSize64)
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}
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}
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if len(d.onlyInB) > 0 {
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must(fmt.Fprintln(buf, "files added:"))
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for _, f := range d.onlyInB {
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must(fmt.Fprintf(buf, " + %v (%v bytes)\n", f.Name, f.UncompressedSize64))
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sizeChange += int64(f.UncompressedSize64)
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}
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}
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if len(d.modified) > 0 || len(d.onlyInA) > 0 || len(d.onlyInB) > 0 {
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must(fmt.Fprintf(buf, "total size change: %v bytes\n", sizeChange))
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}
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return buf.String()
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}
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func diffTargetFilesLists(a, b []*ZipArtifactFile) zipDiff {
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i := 0
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j := 0
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diff := zipDiff{}
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for i < len(a) && j < len(b) {
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if a[i].Name == b[j].Name {
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if a[i].UncompressedSize64 != b[j].UncompressedSize64 || a[i].CRC32 != b[j].CRC32 {
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diff.modified = append(diff.modified, [2]*ZipArtifactFile{a[i], b[j]})
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}
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i++
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j++
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} else if a[i].Name < b[j].Name {
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// a[i] is not present in b
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diff.onlyInA = append(diff.onlyInA, a[i])
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i++
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} else {
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// b[j] is not present in a
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diff.onlyInB = append(diff.onlyInB, b[j])
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j++
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}
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}
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for i < len(a) {
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diff.onlyInA = append(diff.onlyInA, a[i])
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i++
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}
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for j < len(b) {
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diff.onlyInB = append(diff.onlyInB, b[j])
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j++
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}
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return diff
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}
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