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build.go
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package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"sort"
"strconv"
"strings"
"syscall"
"time"
"github.com/oracle/smith/execute"
"github.com/Sirupsen/logrus"
)
const (
rootfs = "rootfs"
)
type buildOptions struct {
insecure bool
fast bool
conf string
dir string
buildNo string
}
func isOci(uri string) bool {
// urls are oci images
if strings.HasPrefix(uri, "http://") ||
strings.HasPrefix(uri, "https://") {
return true
}
// split off potential tag from uri
parts := strings.Split(uri, ":")
file := parts[0]
if len(parts) > 2 {
file = parts[len(parts)-2]
}
// if the filename is a tar ot tgz assume oci
if strings.HasSuffix(file, ".tar") ||
strings.HasSuffix(file, ".tar.gz") ||
strings.HasSuffix(file, ".tgz") {
return true
}
return false
}
// installPackage returns a list of all packages installed if applicable
func installPackage(buildOpts *buildOptions, outputDir string, pkg *ConfigDef) ([]string, error) {
logrus.Infof("Installing package %v", pkg.Package)
if pkg.Type == "" {
if isOci(pkg.Package) {
pkg.Type = "oci"
} else {
pkg.Type = "mock"
}
}
switch pkg.Type {
case "mock":
if pkg.Mock.Config == "" {
pkg.Mock.Config = "/etc/mock/default.cfg"
}
pkgMfst := NewRPMManifest()
if err := buildMock(buildOpts, outputDir, pkg, pkgMfst); err != nil {
return nil, err
}
packages := []string{}
for key := range pkgMfst.PkgsInstalled {
packages = append(packages, key)
}
sort.Strings(packages)
return packages, nil
case "oci":
if err := buildOci(buildOpts, outputDir, pkg); err != nil {
return nil, err
}
return nil, nil
default:
return nil, fmt.Errorf("Package type %v not recognized", pkg.Type)
}
}
func getMetadata() *ImageMetadata {
return &ImageMetadata{
SmithVer: ver,
SmithSha: sha,
BuildTime: time.Now().UTC(),
}
}
func buildContainer(tarfile string, buildOpts *buildOptions) bool {
outpath, err := filepath.Abs(tarfile)
if err != nil {
logrus.Errorf("Failed to get abs path of %v: %v", tarfile, err)
return false
}
current, err := os.Getwd()
if err != nil {
logrus.Errorf("Failed to get working directory: %v", err)
return false
}
path := current
if buildOpts.dir != "" {
path, err = filepath.Abs(buildOpts.dir)
if err != nil {
logrus.Errorf("Failed to get abs path of %v: %v", buildOpts.dir, err)
return false
}
err = os.Chdir(path)
if err != nil {
logrus.Errorf("Failed to change directory to %v: %v", path, err)
return false
}
defer os.Chdir(current)
}
pkg, err := ReadConfig(buildOpts.conf)
if err != nil {
logrus.Errorf("Failed to read config: %v", err)
return false
}
buildDir, err := ioutil.TempDir("", "smith-build-")
if err != nil {
logrus.Errorf("Unable to get temp dir: %v", err)
return false
}
defer func() {
// remove directory
logrus.Debugf("Removing %v", buildDir)
err = os.RemoveAll(buildDir)
if err != nil {
logrus.Warnf("Failed to remove %v: %v", buildDir, err)
}
}()
if err := os.Chmod(buildDir, 0777); err != nil {
logrus.Errorf("Failed to make %v writeable: %v", buildDir, err)
return false
}
logrus.Infof("Building in %v", buildDir)
outputDir, err := rootfsDir(buildDir, rootfs)
if err != nil {
logrus.Errorf("Failed to get rootfs dir: %v", err)
return false
}
nss, err := PopulateNss(outputDir, pkg.User, pkg.Groups, pkg.Nss)
if err != nil {
logrus.Errorf("Failed to populate nss: %v", err)
return false
}
// force nss on if named users or groups were specified
if nss {
pkg.Nss = true
}
// build package
var packages []string
if pkg.Package != "" {
packages, err = installPackage(buildOpts, outputDir, pkg)
if err != nil {
logrus.Errorf("Failed to install %v: %v", pkg.Package, err)
return false
}
}
for _, mnt := range pkg.Mounts {
err = os.MkdirAll(filepath.Join(outputDir, mnt), 0755)
if err != nil {
logrus.Errorf("Failed to create %v dir: %v", mnt, err)
return false
}
}
// ensure meta directory
// TODO: what do we do with meta?
metaDir := filepath.Join(buildDir, ".meta")
err = os.MkdirAll(metaDir, 0755)
if err != nil {
logrus.Errorf("Failed to create .meta dir: %v", err)
return false
}
// write build metadata
extraBlobs := []OpaqueBlob{}
metadata := getMetadata()
metadata.Buildno = buildOpts.buildNo
if hostname, err := os.Hostname(); err == nil {
metadata.BuildHost = hostname
}
// write the normalized config to metadata
smithJSON, err := json.Marshal(pkg)
if err == nil {
newBlob := OpaqueBlob{"application/vnd.smith.spec+json", smithJSON}
extraBlobs = append(extraBlobs, newBlob)
}
if packages != nil {
newBlob := OpaqueBlob{"application/vnd.smith.packages",
[]byte(strings.Join(packages, "\n"))}
extraBlobs = append(extraBlobs, newBlob)
}
// perform overlay
logrus.Infof("Performing overlay")
files := []string{rootfs}
if pkg.Parent != "" {
files = append(files, strings.Split(pkg.Parent, ":")[0])
}
err = CopyTree(path, buildDir, files, nil, pkg.Nss, false, false)
if err != nil {
logrus.Errorf("Failed to copy %v to %v: %v", path, buildDir, err)
return false
}
// pack
logrus.Infof("Packing image into %v", outpath)
if err := WriteOciFromBuild(pkg, buildDir, outpath, metadata, extraBlobs); err != nil {
logrus.Errorf("Failed to pack dir into %v: %v", outpath, err)
return false
}
return true
}
func rootfsDir(buildDir string, rootDir string) (string, error) {
outputDir, err := filepath.Abs(filepath.Join(buildDir, rootDir))
if err != nil {
return "", err
}
err = os.MkdirAll(outputDir, 0755)
if err != nil {
return "", err
}
dirs := []string{"dev", "read", "write", "run", "proc", "sys"}
for _, dir := range dirs {
err = os.MkdirAll(filepath.Join(outputDir, dir), 0755)
if err != nil {
return "", err
}
}
return outputDir, nil
}
func readablePathsFromExecutor(ex executor, paths []string) error {
// chmod anything we are pulling out to be readable by group + others
if len(paths) == 0 {
return nil
}
arg := []string{"-R", "go+rX"}
arg = append(arg, paths...)
_, stderr, err := ex("chmod", arg...)
if err != nil {
logrus.Warnf("chmod failed: %v", strings.TrimSpace(stderr))
return err
}
return nil
}
func buildMockDebuginfo(buildOpts *buildOptions, outputDir string, pkg *ConfigDef, pkgMfst *RPMManifest) error {
baseDir, err := MockBuildDebuginfo(pkgMfst, &pkg.Mock)
if err != nil {
return err
}
paths := pkgMfst.FindDebugInfo(baseDir)
if len(pkg.Mock.DebugPaths) > 0 {
paths = append(paths, pkg.Mock.DebugPaths...)
}
executor := func(name string, arg ...string) (string, string, error) {
return MockExecuteQuiet(pkg.Mock.Config, name, arg...)
}
if err := readablePathsFromExecutor(executor, paths); err != nil {
logrus.Warnf("Could not make paths readable: %v", err)
}
err = CopyTree(baseDir, outputDir, paths, nil, false, false, true)
if err != nil {
return err
}
pkgMfst.ClearDebugState()
return nil
}
func buildMock(buildOpts *buildOptions, outputDir string, pkg *ConfigDef, pkgMfst *RPMManifest) error {
baseDir, err := MockBuild(pkg.Package, buildOpts.fast, &pkg.Mock)
if err != nil {
return err
}
executor := func(name string, arg ...string) (string, string, error) {
return MockExecuteQuiet(pkg.Mock.Config, name, arg...)
}
if err := SetSoPathsFromExecutor(executor, nil); err != nil {
return err
}
if err := readablePathsFromExecutor(executor, pkg.Paths); err != nil {
logrus.Warnf("Could not make paths readable: %v", err)
}
err = CopyTree(baseDir, outputDir, pkg.Paths, pkg.Excludes, pkg.Nss, true, true)
if err != nil {
return err
}
err = pkgMfst.UpdateManifest(baseDir, outputDir, pkg.Mock.Config)
if err != nil {
return err
}
if pkg.Mock.DebugInfo {
return buildMockDebuginfo(buildOpts, outputDir, pkg, pkgMfst)
}
return nil
}
func buildOci(buildOpts *buildOptions, outputDir string, pkg *ConfigDef) error {
uid, gid := os.Getuid(), os.Getgid()
unpackDir := filepath.Join(os.TempDir(), "smith-unpack-"+strconv.Itoa(uid))
var image *Image
var err error
if strings.HasPrefix(pkg.Package, "http://") ||
strings.HasPrefix(pkg.Package, "https://") {
info, err := parseRepoInfo(pkg.Package, false)
if err != nil {
return err
}
image, err = NewRegistryClient(buildOpts.insecure).ImageFromRepo(info)
} else {
image, err = imageFromFile(pkg.Package)
}
if err != nil {
return err
}
// pull the existing data out of the image
setDefaultsFromImage(pkg, image)
if !buildOpts.fast {
// remove directory
logrus.Debugf("Removing %v", unpackDir)
if err := os.RemoveAll(unpackDir); err != nil {
logrus.Errorf("Failed to remove %v: %v", unpackDir, err)
return err
}
}
// set path for executor
path := "/usr/sbin:/usr/bin:/sbin:/bin"
ld_library_path := ""
for _, e := range pkg.Env {
if strings.HasPrefix(e, "PATH=") {
path = e[len("PATH="):]
}
if strings.HasPrefix(e, "LD_LIBRARY_PATH=") {
ld_library_path = e[len("LD_LIBRARY_PATH="):]
}
}
executor := func(name string, arg ...string) (string, string, error) {
attr := &syscall.SysProcAttr{
Chroot: unpackDir,
}
attr, err := setAttrMappings(attr, uid, gid)
if err != nil {
return "", "", err
}
// Find the executable using path in chroot. Note that this will accept a
// symlink even if it is dangling
if !strings.Contains(name, "/") {
for _, dir := range filepath.SplitList(path) {
if dir == "" {
// Unix shell semantics: path element "" means "."
dir = "."
}
path := filepath.Join(unpackDir, dir, name)
d, err := os.Lstat(path)
if err != nil {
continue
}
if m := d.Mode(); m.IsDir() || m&0111 == 0 {
continue
}
name = path[len(unpackDir):]
break
}
}
return execute.AttrExecuteQuiet(attr, name, arg...)
}
// only unpack if the directory doesn't already exist
if _, err := os.Stat(unpackDir); os.IsNotExist(err) {
if err := os.MkdirAll(unpackDir, 0755); err != nil {
return err
}
if err := ExtractOci(image, unpackDir); err != nil {
return err
}
if err := readablePathsFromExecutor(executor, pkg.Paths); err != nil {
logrus.Warnf("Could not make paths readable: %v", err)
}
}
preload := strings.Split(ld_library_path, ":")
if err := SetSoPathsFromExecutor(executor, preload); err != nil {
return err
}
err = CopyTree(unpackDir, outputDir, pkg.Paths, pkg.Excludes, pkg.Nss, true, true)
if err != nil {
return err
}
return nil
}