691 lines
18 KiB
Go
691 lines
18 KiB
Go
package builder
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// internals for handling commands. Covers many areas and a lot of
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// non-contiguous functionality. Please read the comments.
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import (
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"crypto/sha256"
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"encoding/hex"
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"fmt"
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"io"
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"io/ioutil"
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"net/url"
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"os"
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"path"
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"path/filepath"
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"sort"
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"strings"
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"syscall"
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"time"
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"github.com/docker/docker/archive"
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"github.com/docker/docker/daemon"
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imagepkg "github.com/docker/docker/image"
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"github.com/docker/docker/pkg/log"
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"github.com/docker/docker/pkg/parsers"
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"github.com/docker/docker/pkg/promise"
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"github.com/docker/docker/pkg/symlink"
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"github.com/docker/docker/pkg/system"
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"github.com/docker/docker/pkg/tarsum"
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"github.com/docker/docker/registry"
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"github.com/docker/docker/utils"
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)
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func (b *Builder) readContext(context io.Reader) error {
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tmpdirPath, err := ioutil.TempDir("", "docker-build")
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if err != nil {
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return err
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}
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decompressedStream, err := archive.DecompressStream(context)
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if err != nil {
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return err
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}
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if b.context, err = tarsum.NewTarSum(decompressedStream, true, tarsum.Version0); err != nil {
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return err
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}
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if err := archive.Untar(b.context, tmpdirPath, nil); err != nil {
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return err
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}
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b.contextPath = tmpdirPath
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return nil
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}
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func (b *Builder) commit(id string, autoCmd []string, comment string) error {
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if b.image == "" {
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return fmt.Errorf("Please provide a source image with `from` prior to commit")
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}
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b.Config.Image = b.image
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if id == "" {
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cmd := b.Config.Cmd
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b.Config.Cmd = []string{"/bin/sh", "-c", "#(nop) " + comment}
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defer func(cmd []string) { b.Config.Cmd = cmd }(cmd)
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hit, err := b.probeCache()
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if err != nil {
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return err
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}
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if hit {
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return nil
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}
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container, err := b.create()
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if err != nil {
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return err
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}
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id = container.ID
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if err := container.Mount(); err != nil {
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return err
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}
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defer container.Unmount()
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}
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container := b.Daemon.Get(id)
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if container == nil {
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return fmt.Errorf("An error occured while creating the container")
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}
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// Note: Actually copy the struct
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autoConfig := *b.Config
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autoConfig.Cmd = autoCmd
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// Commit the container
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image, err := b.Daemon.Commit(container, "", "", "", b.maintainer, true, &autoConfig)
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if err != nil {
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return err
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}
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b.image = image.ID
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return nil
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}
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type copyInfo struct {
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origPath string
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destPath string
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hash string
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decompress bool
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tmpDir string
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}
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func (b *Builder) runContextCommand(args []string, allowRemote bool, allowDecompression bool, cmdName string) error {
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if b.context == nil {
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return fmt.Errorf("No context given. Impossible to use %s", cmdName)
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}
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if len(args) < 2 {
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return fmt.Errorf("Invalid %s format - at least two arguments required", cmdName)
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}
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dest := args[len(args)-1] // last one is always the dest
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copyInfos := []*copyInfo{}
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b.Config.Image = b.image
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defer func() {
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for _, ci := range copyInfos {
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if ci.tmpDir != "" {
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os.RemoveAll(ci.tmpDir)
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}
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}
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}()
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// Loop through each src file and calculate the info we need to
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// do the copy (e.g. hash value if cached). Don't actually do
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// the copy until we've looked at all src files
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for _, orig := range args[0 : len(args)-1] {
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err := calcCopyInfo(b, cmdName, ©Infos, orig, dest, allowRemote, allowDecompression)
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if err != nil {
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return err
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}
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}
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if len(copyInfos) == 0 {
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return fmt.Errorf("No source files were specified")
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}
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if len(copyInfos) > 1 && !strings.HasSuffix(dest, "/") {
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return fmt.Errorf("When using %s with more than one source file, the destination must be a directory and end with a /", cmdName)
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}
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// For backwards compat, if there's just one CI then use it as the
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// cache look-up string, otherwise hash 'em all into one
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var srcHash string
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var origPaths string
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if len(copyInfos) == 1 {
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srcHash = copyInfos[0].hash
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origPaths = copyInfos[0].origPath
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} else {
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var hashs []string
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var origs []string
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for _, ci := range copyInfos {
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hashs = append(hashs, ci.hash)
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origs = append(origs, ci.origPath)
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}
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hasher := sha256.New()
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hasher.Write([]byte(strings.Join(hashs, ",")))
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srcHash = "multi:" + hex.EncodeToString(hasher.Sum(nil))
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origPaths = strings.Join(origs, " ")
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}
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cmd := b.Config.Cmd
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b.Config.Cmd = []string{"/bin/sh", "-c", fmt.Sprintf("#(nop) %s %s in %s", cmdName, srcHash, dest)}
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defer func(cmd []string) { b.Config.Cmd = cmd }(cmd)
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hit, err := b.probeCache()
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if err != nil {
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return err
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}
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// If we do not have at least one hash, never use the cache
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if hit && b.UtilizeCache {
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return nil
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}
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container, _, err := b.Daemon.Create(b.Config, nil, "")
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if err != nil {
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return err
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}
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b.TmpContainers[container.ID] = struct{}{}
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if err := container.Mount(); err != nil {
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return err
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}
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defer container.Unmount()
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for _, ci := range copyInfos {
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if err := b.addContext(container, ci.origPath, ci.destPath, ci.decompress); err != nil {
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return err
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}
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}
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if err := b.commit(container.ID, cmd, fmt.Sprintf("%s %s in %s", cmdName, origPaths, dest)); err != nil {
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return err
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}
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return nil
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}
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func calcCopyInfo(b *Builder, cmdName string, cInfos *[]*copyInfo, origPath string, destPath string, allowRemote bool, allowDecompression bool) error {
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if origPath != "" && origPath[0] == '/' && len(origPath) > 1 {
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origPath = origPath[1:]
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}
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origPath = strings.TrimPrefix(origPath, "./")
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// In the remote/URL case, download it and gen its hashcode
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if utils.IsURL(origPath) {
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if !allowRemote {
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return fmt.Errorf("Source can't be a URL for %s", cmdName)
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}
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ci := copyInfo{}
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ci.origPath = origPath
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ci.hash = origPath // default to this but can change
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ci.destPath = destPath
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ci.decompress = false
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*cInfos = append(*cInfos, &ci)
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// Initiate the download
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resp, err := utils.Download(ci.origPath)
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if err != nil {
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return err
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}
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// Create a tmp dir
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tmpDirName, err := ioutil.TempDir(b.contextPath, "docker-remote")
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if err != nil {
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return err
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}
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ci.tmpDir = tmpDirName
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// Create a tmp file within our tmp dir
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tmpFileName := path.Join(tmpDirName, "tmp")
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tmpFile, err := os.OpenFile(tmpFileName, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0600)
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if err != nil {
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return err
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}
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// Download and dump result to tmp file
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if _, err := io.Copy(tmpFile, utils.ProgressReader(resp.Body, int(resp.ContentLength), b.OutOld, b.StreamFormatter, true, "", "Downloading")); err != nil {
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tmpFile.Close()
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return err
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}
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fmt.Fprintf(b.OutStream, "\n")
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tmpFile.Close()
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// Remove the mtime of the newly created tmp file
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if err := system.UtimesNano(tmpFileName, make([]syscall.Timespec, 2)); err != nil {
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return err
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}
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ci.origPath = path.Join(filepath.Base(tmpDirName), filepath.Base(tmpFileName))
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// If the destination is a directory, figure out the filename.
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if strings.HasSuffix(ci.destPath, "/") {
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u, err := url.Parse(origPath)
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if err != nil {
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return err
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}
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path := u.Path
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if strings.HasSuffix(path, "/") {
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path = path[:len(path)-1]
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}
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parts := strings.Split(path, "/")
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filename := parts[len(parts)-1]
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if filename == "" {
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return fmt.Errorf("cannot determine filename from url: %s", u)
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}
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ci.destPath = ci.destPath + filename
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}
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// Calc the checksum, only if we're using the cache
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if b.UtilizeCache {
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r, err := archive.Tar(tmpFileName, archive.Uncompressed)
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if err != nil {
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return err
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}
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tarSum, err := tarsum.NewTarSum(r, true, tarsum.Version0)
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if err != nil {
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return err
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}
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if _, err := io.Copy(ioutil.Discard, tarSum); err != nil {
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return err
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}
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ci.hash = tarSum.Sum(nil)
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r.Close()
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}
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return nil
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}
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// Deal with wildcards
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if ContainsWildcards(origPath) {
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for _, fileInfo := range b.context.GetSums() {
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if fileInfo.Name() == "" {
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continue
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}
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match, _ := path.Match(origPath, fileInfo.Name())
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if !match {
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continue
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}
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calcCopyInfo(b, cmdName, cInfos, fileInfo.Name(), destPath, allowRemote, allowDecompression)
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}
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return nil
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}
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// Must be a dir or a file
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if err := b.checkPathForAddition(origPath); err != nil {
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return err
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}
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fi, _ := os.Stat(path.Join(b.contextPath, origPath))
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ci := copyInfo{}
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ci.origPath = origPath
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ci.hash = origPath
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ci.destPath = destPath
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ci.decompress = allowDecompression
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*cInfos = append(*cInfos, &ci)
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// If not using cache don't need to do anything else.
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// If we are using a cache then calc the hash for the src file/dir
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if !b.UtilizeCache {
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return nil
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}
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// Deal with the single file case
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if !fi.IsDir() {
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// This will match first file in sums of the archive
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fis := b.context.GetSums().GetFile(ci.origPath)
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if fis != nil {
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ci.hash = "file:" + fis.Sum()
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}
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return nil
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}
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// Must be a dir
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var subfiles []string
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absOrigPath := path.Join(b.contextPath, ci.origPath)
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// Add a trailing / to make sure we only pick up nested files under
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// the dir and not sibling files of the dir that just happen to
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// start with the same chars
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if !strings.HasSuffix(absOrigPath, "/") {
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absOrigPath += "/"
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}
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// Need path w/o / too to find matching dir w/o trailing /
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absOrigPathNoSlash := absOrigPath[:len(absOrigPath)-1]
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for _, fileInfo := range b.context.GetSums() {
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absFile := path.Join(b.contextPath, fileInfo.Name())
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if strings.HasPrefix(absFile, absOrigPath) || absFile == absOrigPathNoSlash {
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subfiles = append(subfiles, fileInfo.Sum())
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}
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}
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sort.Strings(subfiles)
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hasher := sha256.New()
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hasher.Write([]byte(strings.Join(subfiles, ",")))
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ci.hash = "dir:" + hex.EncodeToString(hasher.Sum(nil))
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return nil
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}
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func ContainsWildcards(name string) bool {
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for i := 0; i < len(name); i++ {
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ch := name[i]
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if ch == '\\' {
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i++
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} else if ch == '*' || ch == '?' || ch == '[' {
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return true
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}
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}
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return false
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}
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func (b *Builder) pullImage(name string) (*imagepkg.Image, error) {
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remote, tag := parsers.ParseRepositoryTag(name)
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if tag == "" {
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tag = "latest"
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}
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pullRegistryAuth := b.AuthConfig
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if len(b.AuthConfigFile.Configs) > 0 {
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// The request came with a full auth config file, we prefer to use that
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endpoint, _, err := registry.ResolveRepositoryName(remote)
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if err != nil {
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return nil, err
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}
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resolvedAuth := b.AuthConfigFile.ResolveAuthConfig(endpoint)
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pullRegistryAuth = &resolvedAuth
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}
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job := b.Engine.Job("pull", remote, tag)
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job.SetenvBool("json", b.StreamFormatter.Json())
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job.SetenvBool("parallel", true)
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job.SetenvJson("authConfig", pullRegistryAuth)
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job.Stdout.Add(b.OutOld)
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if err := job.Run(); err != nil {
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return nil, err
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}
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image, err := b.Daemon.Repositories().LookupImage(name)
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if err != nil {
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return nil, err
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}
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return image, nil
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}
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func (b *Builder) processImageFrom(img *imagepkg.Image) error {
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b.image = img.ID
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if img.Config != nil {
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b.Config = img.Config
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}
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if len(b.Config.Env) == 0 {
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b.Config.Env = append(b.Config.Env, "PATH="+daemon.DefaultPathEnv)
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}
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// Process ONBUILD triggers if they exist
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if nTriggers := len(b.Config.OnBuild); nTriggers != 0 {
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fmt.Fprintf(b.ErrStream, "# Executing %d build triggers\n", nTriggers)
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}
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// Copy the ONBUILD triggers, and remove them from the config, since the config will be commited.
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onBuildTriggers := b.Config.OnBuild
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b.Config.OnBuild = []string{}
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// FIXME rewrite this so that builder/parser is used; right now steps in
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// onbuild are muted because we have no good way to represent the step
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// number
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for stepN, step := range onBuildTriggers {
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splitStep := strings.Split(step, " ")
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stepInstruction := strings.ToUpper(strings.Trim(splitStep[0], " "))
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switch stepInstruction {
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case "ONBUILD":
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return fmt.Errorf("Source image contains forbidden chained `ONBUILD ONBUILD` trigger: %s", step)
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case "MAINTAINER", "FROM":
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return fmt.Errorf("Source image contains forbidden %s trigger: %s", stepInstruction, step)
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}
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// FIXME we have to run the evaluator manually here. This does not belong
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// in this function. Once removed, the init() in evaluator.go should no
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// longer be necessary.
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if f, ok := evaluateTable[strings.ToLower(stepInstruction)]; ok {
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fmt.Fprintf(b.OutStream, "Trigger %d, %s\n", stepN, step)
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if err := f(b, splitStep[1:], nil); err != nil {
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return err
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}
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} else {
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return fmt.Errorf("%s doesn't appear to be a valid Dockerfile instruction", splitStep[0])
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}
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}
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return nil
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}
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// probeCache checks to see if image-caching is enabled (`b.UtilizeCache`)
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// and if so attempts to look up the current `b.image` and `b.Config` pair
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// in the current server `b.Daemon`. If an image is found, probeCache returns
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// `(true, nil)`. If no image is found, it returns `(false, nil)`. If there
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// is any error, it returns `(false, err)`.
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func (b *Builder) probeCache() (bool, error) {
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if b.UtilizeCache {
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if cache, err := b.Daemon.ImageGetCached(b.image, b.Config); err != nil {
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return false, err
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} else if cache != nil {
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fmt.Fprintf(b.OutStream, " ---> Using cache\n")
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log.Debugf("[BUILDER] Use cached version")
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b.image = cache.ID
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return true, nil
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} else {
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log.Debugf("[BUILDER] Cache miss")
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}
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}
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return false, nil
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}
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func (b *Builder) create() (*daemon.Container, error) {
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if b.image == "" {
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return nil, fmt.Errorf("Please provide a source image with `from` prior to run")
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}
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b.Config.Image = b.image
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config := *b.Config
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// Create the container
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c, warnings, err := b.Daemon.Create(b.Config, nil, "")
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if err != nil {
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return nil, err
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}
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for _, warning := range warnings {
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fmt.Fprintf(b.OutStream, " ---> [Warning] %s\n", warning)
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}
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b.TmpContainers[c.ID] = struct{}{}
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fmt.Fprintf(b.OutStream, " ---> Running in %s\n", utils.TruncateID(c.ID))
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// override the entry point that may have been picked up from the base image
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c.Path = config.Cmd[0]
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c.Args = config.Cmd[1:]
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return c, nil
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}
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func (b *Builder) run(c *daemon.Container) error {
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var errCh chan error
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if b.Verbose {
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errCh = promise.Go(func() error {
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// FIXME: call the 'attach' job so that daemon.Attach can be made private
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//
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// FIXME (LK4D4): Also, maybe makes sense to call "logs" job, it is like attach
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// but without hijacking for stdin. Also, with attach there can be race
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// condition because of some output already was printed before it.
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return <-b.Daemon.Attach(&c.StreamConfig, c.Config.OpenStdin, c.Config.StdinOnce, c.Config.Tty, nil, nil, b.OutStream, b.ErrStream)
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})
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}
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|
//start the container
|
|
if err := c.Start(); err != nil {
|
|
return err
|
|
}
|
|
|
|
if errCh != nil {
|
|
if err := <-errCh; err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// Wait for it to finish
|
|
if ret, _ := c.WaitStop(-1 * time.Second); ret != 0 {
|
|
err := &utils.JSONError{
|
|
Message: fmt.Sprintf("The command %v returned a non-zero code: %d", b.Config.Cmd, ret),
|
|
Code: ret,
|
|
}
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (b *Builder) checkPathForAddition(orig string) error {
|
|
origPath := path.Join(b.contextPath, orig)
|
|
origPath, err := filepath.EvalSymlinks(origPath)
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
return fmt.Errorf("%s: no such file or directory", orig)
|
|
}
|
|
return err
|
|
}
|
|
if !strings.HasPrefix(origPath, b.contextPath) {
|
|
return fmt.Errorf("Forbidden path outside the build context: %s (%s)", orig, origPath)
|
|
}
|
|
if _, err := os.Stat(origPath); err != nil {
|
|
if os.IsNotExist(err) {
|
|
return fmt.Errorf("%s: no such file or directory", orig)
|
|
}
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (b *Builder) addContext(container *daemon.Container, orig, dest string, decompress bool) error {
|
|
var (
|
|
err error
|
|
destExists = true
|
|
origPath = path.Join(b.contextPath, orig)
|
|
destPath = path.Join(container.RootfsPath(), dest)
|
|
)
|
|
|
|
if destPath != container.RootfsPath() {
|
|
destPath, err = symlink.FollowSymlinkInScope(destPath, container.RootfsPath())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// Preserve the trailing '/'
|
|
if strings.HasSuffix(dest, "/") || dest == "." {
|
|
destPath = destPath + "/"
|
|
}
|
|
|
|
destStat, err := os.Stat(destPath)
|
|
if err != nil {
|
|
if !os.IsNotExist(err) {
|
|
return err
|
|
}
|
|
destExists = false
|
|
}
|
|
|
|
fi, err := os.Stat(origPath)
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
return fmt.Errorf("%s: no such file or directory", orig)
|
|
}
|
|
return err
|
|
}
|
|
|
|
if fi.IsDir() {
|
|
return copyAsDirectory(origPath, destPath, destExists)
|
|
}
|
|
|
|
// If we are adding a remote file (or we've been told not to decompress), do not try to untar it
|
|
if decompress {
|
|
// First try to unpack the source as an archive
|
|
// to support the untar feature we need to clean up the path a little bit
|
|
// because tar is very forgiving. First we need to strip off the archive's
|
|
// filename from the path but this is only added if it does not end in / .
|
|
tarDest := destPath
|
|
if strings.HasSuffix(tarDest, "/") {
|
|
tarDest = filepath.Dir(destPath)
|
|
}
|
|
|
|
// try to successfully untar the orig
|
|
if err := archive.UntarPath(origPath, tarDest); err == nil {
|
|
return nil
|
|
} else if err != io.EOF {
|
|
log.Debugf("Couldn't untar %s to %s: %s", origPath, tarDest, err)
|
|
}
|
|
}
|
|
|
|
if err := os.MkdirAll(path.Dir(destPath), 0755); err != nil {
|
|
return err
|
|
}
|
|
if err := archive.CopyWithTar(origPath, destPath); err != nil {
|
|
return err
|
|
}
|
|
|
|
resPath := destPath
|
|
if destExists && destStat.IsDir() {
|
|
resPath = path.Join(destPath, path.Base(origPath))
|
|
}
|
|
|
|
return fixPermissions(resPath, 0, 0)
|
|
}
|
|
|
|
func copyAsDirectory(source, destination string, destinationExists bool) error {
|
|
if err := archive.CopyWithTar(source, destination); err != nil {
|
|
return err
|
|
}
|
|
|
|
if destinationExists {
|
|
files, err := ioutil.ReadDir(source)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
for _, file := range files {
|
|
if err := fixPermissions(filepath.Join(destination, file.Name()), 0, 0); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
return fixPermissions(destination, 0, 0)
|
|
}
|
|
|
|
func fixPermissions(destination string, uid, gid int) error {
|
|
return filepath.Walk(destination, func(path string, info os.FileInfo, err error) error {
|
|
if err := os.Lchown(path, uid, gid); err != nil && !os.IsNotExist(err) {
|
|
return err
|
|
}
|
|
return nil
|
|
})
|
|
}
|
|
|
|
func (b *Builder) clearTmp() {
|
|
for c := range b.TmpContainers {
|
|
tmp := b.Daemon.Get(c)
|
|
if err := b.Daemon.Destroy(tmp); err != nil {
|
|
fmt.Fprintf(b.OutStream, "Error removing intermediate container %s: %s\n", utils.TruncateID(c), err.Error())
|
|
return
|
|
}
|
|
b.Daemon.DeleteVolumes(tmp.VolumePaths())
|
|
delete(b.TmpContainers, c)
|
|
fmt.Fprintf(b.OutStream, "Removing intermediate container %s\n", utils.TruncateID(c))
|
|
}
|
|
}
|