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// ratt operates on a Debian .changes file of a just-built package, identifies
// all reverse-build-dependencies and rebuilds them with the .debs from the
// .changes file.
//
// The intended use-case is, for example, to package a new snapshot of a Go
// library and verify that the new version does not break any other Go
// libraries/binaries.
package main
import (
"bufio"
"bytes"
"flag"
"fmt"
"io"
"log"
"os"
"os/exec"
"path/filepath"
"regexp"
"sort"
"strings"
"pault.ag/go/debian/control"
"pault.ag/go/debian/version"
)
type buildResult struct {
src string
version *version.Version
err error
recheckErr error
logFile string
recheckLogFile string
}
var (
logDir = flag.String("log_dir",
"buildlogs",
"Directory in which sbuild(1) logs for all reverse-build-dependencies are stored")
dryRun = flag.Bool("dry_run",
false,
"Print sbuild command lines, but do not actually build the reverse-build-dependencies")
sbuildDist = flag.String("sbuild_dist",
"",
"sbuild --dist= value (e.g. \"sid\"). Defaults to the Distribution: entry from the specified .changes file")
dist = flag.String("dist",
"",
"Distribution to look up reverse-build-dependencies from. Defaults to the Distribution: entry from the specified .changes file")
recheck = flag.Bool("recheck",
false,
"Rebuild without new changes to check if the failures are really related")
listsPrefixRe = regexp.MustCompile(`/([^/]*_dists_.*)_InRelease$`)
)
func dependsOn(src control.SourceIndex, binaries map[string]bool) bool {
buildDepends := src.GetBuildDepends()
for _, possibility := range buildDepends.GetAllPossibilities() {
if binaries[possibility.Name] {
return true
}
}
return false
}
func addReverseBuildDeps(sourcesPath string, binaries map[string]bool, rebuild map[string][]version.Version) error {
log.Printf("Loading sources index %q\n", sourcesPath)
catFile := exec.Command("/usr/lib/apt/apt-helper",
"cat-file",
sourcesPath)
var s *bufio.Reader
if lines, err := catFile.Output(); err == nil {
s = bufio.NewReader(bytes.NewReader(lines))
} else {
// Fallback for older versions of apt-get. See
// <20160111171230.GA17291@debian.org> for context.
o, err := os.Open(sourcesPath)
if err != nil {
return err
}
defer o.Close()
s = bufio.NewReader(o)
}
idx, err := control.ParseSourceIndex(s)
if err != nil && err != io.EOF {
return err
}
for _, src := range idx {
if dependsOn(src, binaries) {
rebuild[src.Package] = append(rebuild[src.Package], src.Version)
}
}
return nil
}
func fallback(sourcesPaths []string, binaries []string) (map[string][]version.Version, error) {
bins := make(map[string]bool)
for _, bin := range binaries {
bins[bin] = true
}
rebuild := make(map[string][]version.Version)
for _, sourcesPath := range sourcesPaths {
if err := addReverseBuildDeps(sourcesPath, bins, rebuild); err != nil {
return nil, err
}
}
return rebuild, nil
}
func reverseBuildDeps(packagesPaths, sourcesPaths []string, binaries []string) (map[string][]version.Version, error) {
if _, err := exec.LookPath("dose-ceve"); err != nil {
log.Printf("dose-ceve(1) not found. Please install the dose-extra package for more accurate results. Falling back to interpreting Sources directly")
return fallback(sourcesPaths, binaries)
}
archOut, err := exec.Command("dpkg-architecture", "--query=DEB_BUILD_ARCH").Output()
if err != nil {
log.Fatal(err)
}
arch := strings.TrimSpace(string(archOut))
// TODO: Cache this output based on the .changes file. dose-ceve takes quite a while.
ceve := exec.Command(
"dose-ceve",
"--deb-native-arch="+arch,
"-T", "debsrc",
"-r", strings.Join(binaries, ","),
"-G", "pkg")
for _, packagesPath := range packagesPaths {
ceve.Args = append(ceve.Args, "deb://"+packagesPath)
}
for _, sourcesPath := range sourcesPaths {
ceve.Args = append(ceve.Args, "debsrc://"+sourcesPath)
}
ceve.Stderr = os.Stderr
log.Printf("Figuring out reverse build dependencies using dose-ceve(1). This might take a while")
out, err := ceve.Output()
if err != nil {
log.Printf("dose-ceve(1) failed (%v), falling back to interpreting Sources directly", err)
return fallback(sourcesPaths, binaries)
}
var doseCeves []struct {
Package string
Version version.Version
}
r := bufio.NewReader(bytes.NewReader(out))
if err := control.Unmarshal(&doseCeves, r); err != nil {
return nil, err
}
rebuild := make(map[string][]version.Version)
for _, doseCeve := range doseCeves {
rebuild[doseCeve.Package] = append(rebuild[doseCeve.Package], doseCeve.Version)
}
return rebuild, nil
}
func main() {
flag.Parse()
if flag.NArg() == 0 {
log.Fatalf("Usage: %s [options] <path-to-changes-file>...\n", os.Args[0])
}
var debs []string
var binaries []string
var changesDist string
for i, changesPath := range flag.Args() {
log.Printf("Loading changes file %q\n", changesPath)
c, err := os.Open(changesPath)
if err != nil {
log.Fatal(err)
}
defer c.Close()
changes, err := control.ParseChanges(bufio.NewReader(c), changesPath)
if err != nil && err != io.EOF {
log.Fatal(err)
}
log.Printf(" - %d binary packages: %s\n", len(changes.Binaries), strings.Join(changes.Binaries, " "))
for _, file := range changes.Files {
if filepath.Ext(file.Filename) == ".deb" {
debs = append(debs, filepath.Join(filepath.Dir(changesPath), file.Filename))
}
}
binaries = append(binaries, changes.Binaries...)
if i == 0 {
changesDist = changes.Distribution
} else if changesDist != changes.Distribution {
log.Printf("%s has different distrution, but we will only consider %s\n", changes.Filename, changesDist)
}
}
log.Printf("Corresponding .debs (will be injected when building):\n")
for _, deb := range debs {
log.Printf(" %s\n", deb)
}
if strings.TrimSpace(*dist) == "" {
*dist = changesDist
// Rewrite unstable to sid, which apt-get indextargets (below) requires.
if *dist == "unstable" {
*dist = "sid"
}
log.Printf("Setting -dist=%s (from .changes file)\n", *dist)
}
var sourcesPaths []string
var packagesPaths []string
indexTargets := exec.Command("apt-get",
"indextargets",
"--format",
"$(FILENAME)",
"Codename: "+*dist,
"ShortDesc: Sources")
if lines, err := indexTargets.Output(); err == nil {
for _, line := range strings.Split(string(lines), "\n") {
trimmed := strings.TrimSpace(line)
if trimmed != "" {
sourcesPaths = append(sourcesPaths, line)
}
}
binaryIndexTargets := exec.Command(
"apt-get",
"indextargets",
"--format",
"$(FILENAME)",
"Codename: "+*dist,
"ShortDesc: Packages")
lines, err = binaryIndexTargets.Output()
if err != nil {
log.Fatal("Could not get packages files using %+v: %v", binaryIndexTargets.Args, err)
}
for _, line := range strings.Split(string(lines), "\n") {
trimmed := strings.TrimSpace(line)
if trimmed != "" {
packagesPaths = append(packagesPaths, line)
}
}
} else {
// Fallback for older versions of apt-get. See
// https://bugs.debian.org/801594 for context.
releaseMatches, err := filepath.Glob("/var/lib/apt/lists/*_InRelease")
if err != nil {
log.Fatal(err)
}
for _, releasepath := range releaseMatches {
r, err := os.Open(releasepath)
if err != nil {
log.Fatal(err)
}
defer r.Close()
var inRelease struct {
Suite string
}
if err := control.Unmarshal(&inRelease, bufio.NewReader(r)); err != nil {
log.Fatal(err)
}
listsPrefix := listsPrefixRe.FindStringSubmatch(releasepath)
if len(listsPrefix) != 2 {
log.Fatalf("release file path %q does not match regexp %q\n", releasepath, listsPrefixRe)
}
sourceMatches, err := filepath.Glob(fmt.Sprintf("/var/lib/apt/lists/%s_*_Sources", listsPrefix[1]))
if err != nil {
log.Fatal(err)
}
sourcesPaths = append(sourcesPaths, sourceMatches...)
packagesMatches, err := filepath.Glob(fmt.Sprintf("/var/lib/apt/lists/%s_*_Packages", listsPrefix[1]))
if err != nil {
log.Fatal(err)
}
packagesPaths = append(packagesPaths, packagesMatches...)
}
}
if len(sourcesPaths) == 0 {
log.Fatal("Could not find InRelease file for " + *dist + " . Are you missing " + *dist + " in your /etc/apt/sources.list?")
}
rebuild, err := reverseBuildDeps(packagesPaths, sourcesPaths, binaries)
if err != nil {
log.Fatal(err)
}
// TODO: add -recursive flag to also cover dependencies which are not DIRECT dependencies. use http://godoc.org/pault.ag/go/debian/control#OrderDSCForBuild (topsort) to build dependencies in the right order (saving CPU time).
// TODO: what’s a good integration method for doing this in more setups, e.g. on a cloud provider or something? mapreri from #debian-qa says jenkins.debian.net is suitable.
if strings.TrimSpace(*sbuildDist) == "" {
*sbuildDist = changesDist
log.Printf("Setting -sbuild_dist=%s (from .changes file)\n", *sbuildDist)
}
if err := os.MkdirAll(*logDir, 0755); err != nil {
log.Fatal(err)
}
builder := &sbuild{
dist: *sbuildDist,
logDir: *logDir,
dryRun: *dryRun,
extraDebs: debs,
}
cnt := 1
buildresults := make(map[string](*buildResult))
for src, versions := range rebuild {
sort.Sort(sort.Reverse(version.Slice(versions)))
newest := versions[0]
log.Printf("Building package %d of %d: %s \n", cnt, len(rebuild), src)
cnt++
result := builder.build(src, &newest)
if result.err != nil {
log.Printf("building %s failed: %v\n", src, result.err)
}
buildresults[src] = result
}
if *dryRun {
return
}
if *recheck {
log.Printf("Begin to rebuild all failed packages without new changes\n")
recheckBuilder := &sbuild{
dist: *sbuildDist,
logDir: *logDir + "_recheck",
dryRun: false,
}
if err := os.MkdirAll(recheckBuilder.logDir, 0755); err != nil {
log.Fatal(err)
}
for src, result := range buildresults {
if result.err == nil {
continue
}
recheckResult := recheckBuilder.build(src, result.version)
result.recheckErr = recheckResult.err
result.recheckLogFile = recheckResult.logFile
if recheckResult.err != nil {
log.Printf("rebuilding %s without new packages failed: %v\n", src, recheckResult.err)
}
}
}
log.Printf("Build results:\n")
// Print all successful builds first (not as interesting), then failed ones.
for src, result := range buildresults {
if result.err == nil {
log.Printf("PASSED: %s\n", src)
}
}
for src, result := range buildresults {
if result.err != nil && result.recheckErr != nil {
log.Printf("FAILED: %s, but maybe unrelated to new changes (see %s and %s)\n",
src, result.logFile, result.recheckLogFile)
}
}
failures := false
for src, result := range buildresults {
if result.err != nil && result.recheckErr == nil {
log.Printf("FAILED: %s (see %s)\n", src, result.logFile)
failures = true
}
}
if failures {
os.Exit(1)
}
}
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