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dispatchers.go
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dispatchers.go
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package dockerfile // import "github.com/docker/docker/builder/dockerfile"
// This file contains the dispatchers for each command. Note that
// `nullDispatch` is not actually a command, but support for commands we parse
// but do nothing with.
//
// See evaluator.go for a higher level discussion of the whole evaluator
// package.
import (
"bytes"
"fmt"
"runtime"
"sort"
"strings"
"github.com/containerd/containerd/platforms"
"github.com/docker/docker/api"
"github.com/docker/docker/api/types/strslice"
"github.com/docker/docker/builder"
"github.com/docker/docker/errdefs"
"github.com/docker/docker/image"
"github.com/docker/docker/pkg/jsonmessage"
"github.com/docker/docker/pkg/signal"
"github.com/docker/docker/pkg/system"
"github.com/docker/go-connections/nat"
"github.com/moby/buildkit/frontend/dockerfile/instructions"
"github.com/moby/buildkit/frontend/dockerfile/parser"
"github.com/moby/buildkit/frontend/dockerfile/shell"
specs "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
)
// ENV foo bar
//
// Sets the environment variable foo to bar, also makes interpolation
// in the dockerfile available from the next statement on via ${foo}.
func dispatchEnv(d dispatchRequest, c *instructions.EnvCommand) error {
runConfig := d.state.runConfig
commitMessage := bytes.NewBufferString("ENV")
for _, e := range c.Env {
name := e.Key
newVar := e.String()
commitMessage.WriteString(" " + newVar)
gotOne := false
for i, envVar := range runConfig.Env {
envParts := strings.SplitN(envVar, "=", 2)
compareFrom := envParts[0]
if shell.EqualEnvKeys(compareFrom, name) {
runConfig.Env[i] = newVar
gotOne = true
break
}
}
if !gotOne {
runConfig.Env = append(runConfig.Env, newVar)
}
}
return d.builder.commit(d.state, commitMessage.String())
}
// MAINTAINER some text <maybe@an.email.address>
//
// Sets the maintainer metadata.
func dispatchMaintainer(d dispatchRequest, c *instructions.MaintainerCommand) error {
d.state.maintainer = c.Maintainer
return d.builder.commit(d.state, "MAINTAINER "+c.Maintainer)
}
// LABEL some json data describing the image
//
// Sets the Label variable foo to bar,
func dispatchLabel(d dispatchRequest, c *instructions.LabelCommand) error {
if d.state.runConfig.Labels == nil {
d.state.runConfig.Labels = make(map[string]string)
}
commitStr := "LABEL"
for _, v := range c.Labels {
d.state.runConfig.Labels[v.Key] = v.Value
commitStr += " " + v.String()
}
return d.builder.commit(d.state, commitStr)
}
// ADD foo /path
//
// Add the file 'foo' to '/path'. Tarball and Remote URL (http, https) handling
// exist here. If you do not wish to have this automatic handling, use COPY.
func dispatchAdd(d dispatchRequest, c *instructions.AddCommand) error {
if c.Chmod != "" {
return errors.New("the --chmod option requires BuildKit. Refer to https://docs.docker.com/go/buildkit/ to learn how to build images with BuildKit enabled")
}
downloader := newRemoteSourceDownloader(d.builder.Output, d.builder.Stdout)
copier := copierFromDispatchRequest(d, downloader, nil)
defer copier.Cleanup()
copyInstruction, err := copier.createCopyInstruction(c.SourcesAndDest, "ADD")
if err != nil {
return err
}
copyInstruction.chownStr = c.Chown
copyInstruction.allowLocalDecompression = true
return d.builder.performCopy(d, copyInstruction)
}
// COPY foo /path
//
// Same as 'ADD' but without the tar and remote url handling.
func dispatchCopy(d dispatchRequest, c *instructions.CopyCommand) error {
if c.Chmod != "" {
return errors.New("the --chmod option requires BuildKit. Refer to https://docs.docker.com/go/buildkit/ to learn how to build images with BuildKit enabled")
}
var im *imageMount
var err error
if c.From != "" {
im, err = d.getImageMount(c.From)
if err != nil {
return errors.Wrapf(err, "invalid from flag value %s", c.From)
}
}
copier := copierFromDispatchRequest(d, errOnSourceDownload, im)
defer copier.Cleanup()
copyInstruction, err := copier.createCopyInstruction(c.SourcesAndDest, "COPY")
if err != nil {
return err
}
copyInstruction.chownStr = c.Chown
if c.From != "" && copyInstruction.chownStr == "" {
copyInstruction.preserveOwnership = true
}
return d.builder.performCopy(d, copyInstruction)
}
func (d *dispatchRequest) getImageMount(imageRefOrID string) (*imageMount, error) {
if imageRefOrID == "" {
// TODO: this could return the source in the default case as well?
return nil, nil
}
var localOnly bool
stage, err := d.stages.get(imageRefOrID)
if err != nil {
return nil, err
}
if stage != nil {
imageRefOrID = stage.Image
localOnly = true
}
return d.builder.imageSources.Get(imageRefOrID, localOnly, d.builder.platform)
}
// FROM [--platform=platform] imagename[:tag | @digest] [AS build-stage-name]
func initializeStage(d dispatchRequest, cmd *instructions.Stage) error {
d.builder.imageProber.Reset()
var platform *specs.Platform
if v := cmd.Platform; v != "" {
v, err := d.getExpandedString(d.shlex, v)
if err != nil {
return errors.Wrapf(err, "failed to process arguments for platform %s", v)
}
p, err := platforms.Parse(v)
if err != nil {
return errors.Wrapf(err, "failed to parse platform %s", v)
}
if err := system.ValidatePlatform(p); err != nil {
return err
}
platform = &p
}
image, err := d.getFromImage(d.shlex, cmd.BaseName, platform)
if err != nil {
return err
}
state := d.state
if err := state.beginStage(cmd.Name, image); err != nil {
return err
}
if len(state.runConfig.OnBuild) > 0 {
triggers := state.runConfig.OnBuild
state.runConfig.OnBuild = nil
return dispatchTriggeredOnBuild(d, triggers)
}
return nil
}
func dispatchTriggeredOnBuild(d dispatchRequest, triggers []string) error {
fmt.Fprintf(d.builder.Stdout, "# Executing %d build trigger", len(triggers))
if len(triggers) > 1 {
fmt.Fprint(d.builder.Stdout, "s")
}
fmt.Fprintln(d.builder.Stdout)
for _, trigger := range triggers {
d.state.updateRunConfig()
ast, err := parser.Parse(strings.NewReader(trigger))
if err != nil {
return err
}
if len(ast.AST.Children) != 1 {
return errors.New("onbuild trigger should be a single expression")
}
cmd, err := instructions.ParseCommand(ast.AST.Children[0])
if err != nil {
var uiErr *instructions.UnknownInstruction
if errors.As(err, &uiErr) {
buildsFailed.WithValues(metricsUnknownInstructionError).Inc()
}
return err
}
err = dispatch(d, cmd)
if err != nil {
return err
}
}
return nil
}
func (d *dispatchRequest) getExpandedString(shlex *shell.Lex, str string) (string, error) {
substitutionArgs := []string{}
for key, value := range d.state.buildArgs.GetAllMeta() {
substitutionArgs = append(substitutionArgs, key+"="+value)
}
name, err := shlex.ProcessWord(str, substitutionArgs)
if err != nil {
return "", err
}
return name, nil
}
func (d *dispatchRequest) getImageOrStage(name string, platform *specs.Platform) (builder.Image, error) {
var localOnly bool
if im, ok := d.stages.getByName(name); ok {
name = im.Image
localOnly = true
}
if platform == nil {
platform = d.builder.platform
}
// Windows cannot support a container with no base image unless it is LCOW.
if name == api.NoBaseImageSpecifier {
p := platforms.DefaultSpec()
if platform != nil {
p = *platform
}
imageImage := &image.Image{}
imageImage.OS = p.OS
// old windows scratch handling
// TODO: scratch should not have an os. It should be nil image.
// Windows supports scratch. What is not supported is running containers
// from it.
if runtime.GOOS == "windows" {
if platform == nil || platform.OS == "linux" {
if !system.LCOWSupported() {
return nil, errors.New("Linux containers are not supported on this system")
}
imageImage.OS = "linux"
} else if platform.OS == "windows" {
return nil, errors.New("Windows does not support FROM scratch")
} else {
return nil, errors.Errorf("platform %s is not supported", platforms.Format(p))
}
}
return builder.Image(imageImage), nil
}
imageMount, err := d.builder.imageSources.Get(name, localOnly, platform)
if err != nil {
return nil, err
}
return imageMount.Image(), nil
}
func (d *dispatchRequest) getFromImage(shlex *shell.Lex, basename string, platform *specs.Platform) (builder.Image, error) {
name, err := d.getExpandedString(shlex, basename)
if err != nil {
return nil, err
}
// Empty string is interpreted to FROM scratch by images.GetImageAndReleasableLayer,
// so validate expanded result is not empty.
if name == "" {
return nil, errors.Errorf("base name (%s) should not be blank", basename)
}
return d.getImageOrStage(name, platform)
}
func dispatchOnbuild(d dispatchRequest, c *instructions.OnbuildCommand) error {
d.state.runConfig.OnBuild = append(d.state.runConfig.OnBuild, c.Expression)
return d.builder.commit(d.state, "ONBUILD "+c.Expression)
}
// WORKDIR /tmp
//
// Set the working directory for future RUN/CMD/etc statements.
func dispatchWorkdir(d dispatchRequest, c *instructions.WorkdirCommand) error {
runConfig := d.state.runConfig
var err error
runConfig.WorkingDir, err = normalizeWorkdir(d.state.operatingSystem, runConfig.WorkingDir, c.Path)
if err != nil {
return err
}
// For performance reasons, we explicitly do a create/mkdir now
// This avoids having an unnecessary expensive mount/unmount calls
// (on Windows in particular) during each container create.
// Prior to 1.13, the mkdir was deferred and not executed at this step.
if d.builder.disableCommit {
// Don't call back into the daemon if we're going through docker commit --change "WORKDIR /foo".
// We've already updated the runConfig and that's enough.
return nil
}
comment := "WORKDIR " + runConfig.WorkingDir
runConfigWithCommentCmd := copyRunConfig(runConfig, withCmdCommentString(comment, d.state.operatingSystem))
containerID, err := d.builder.probeAndCreate(d.state, runConfigWithCommentCmd)
if err != nil || containerID == "" {
return err
}
if err := d.builder.docker.ContainerCreateWorkdir(containerID); err != nil {
return err
}
return d.builder.commitContainer(d.state, containerID, runConfigWithCommentCmd)
}
// RUN some command yo
//
// run a command and commit the image. Args are automatically prepended with
// the current SHELL which defaults to 'sh -c' under linux or 'cmd /S /C' under
// Windows, in the event there is only one argument The difference in processing:
//
// RUN echo hi # sh -c echo hi (Linux and LCOW)
// RUN echo hi # cmd /S /C echo hi (Windows)
// RUN [ "echo", "hi" ] # echo hi
func dispatchRun(d dispatchRequest, c *instructions.RunCommand) error {
if !system.IsOSSupported(d.state.operatingSystem) {
return system.ErrNotSupportedOperatingSystem
}
if len(c.FlagsUsed) > 0 {
// classic builder RUN currently does not support any flags, so fail on the first one
return errors.Errorf("the --%s option requires BuildKit. Refer to https://docs.docker.com/go/buildkit/ to learn how to build images with BuildKit enabled", c.FlagsUsed[0])
}
stateRunConfig := d.state.runConfig
cmdFromArgs, argsEscaped := resolveCmdLine(c.ShellDependantCmdLine, stateRunConfig, d.state.operatingSystem, c.Name(), c.String())
buildArgs := d.state.buildArgs.FilterAllowed(stateRunConfig.Env)
saveCmd := cmdFromArgs
if len(buildArgs) > 0 {
saveCmd = prependEnvOnCmd(d.state.buildArgs, buildArgs, cmdFromArgs)
}
runConfigForCacheProbe := copyRunConfig(stateRunConfig,
withCmd(saveCmd),
withArgsEscaped(argsEscaped),
withEntrypointOverride(saveCmd, nil))
if hit, err := d.builder.probeCache(d.state, runConfigForCacheProbe); err != nil || hit {
return err
}
runConfig := copyRunConfig(stateRunConfig,
withCmd(cmdFromArgs),
withArgsEscaped(argsEscaped),
withEnv(append(stateRunConfig.Env, buildArgs...)),
withEntrypointOverride(saveCmd, strslice.StrSlice{""}),
withoutHealthcheck())
cID, err := d.builder.create(runConfig)
if err != nil {
return err
}
if err := d.builder.containerManager.Run(d.builder.clientCtx, cID, d.builder.Stdout, d.builder.Stderr); err != nil {
if err, ok := err.(*statusCodeError); ok {
// TODO: change error type, because jsonmessage.JSONError assumes HTTP
msg := fmt.Sprintf(
"The command '%s' returned a non-zero code: %d",
strings.Join(runConfig.Cmd, " "), err.StatusCode())
if err.Error() != "" {
msg = fmt.Sprintf("%s: %s", msg, err.Error())
}
return &jsonmessage.JSONError{
Message: msg,
Code: err.StatusCode(),
}
}
return err
}
// Don't persist the argsEscaped value in the committed image. Use the original
// from previous build steps (only CMD and ENTRYPOINT persist this).
if d.state.operatingSystem == "windows" {
runConfigForCacheProbe.ArgsEscaped = stateRunConfig.ArgsEscaped
}
return d.builder.commitContainer(d.state, cID, runConfigForCacheProbe)
}
// Derive the command to use for probeCache() and to commit in this container.
// Note that we only do this if there are any build-time env vars. Also, we
// use the special argument "|#" at the start of the args array. This will
// avoid conflicts with any RUN command since commands can not
// start with | (vertical bar). The "#" (number of build envs) is there to
// help ensure proper cache matches. We don't want a RUN command
// that starts with "foo=abc" to be considered part of a build-time env var.
//
// remove any unreferenced built-in args from the environment variables.
// These args are transparent so resulting image should be the same regardless
// of the value.
func prependEnvOnCmd(buildArgs *BuildArgs, buildArgVars []string, cmd strslice.StrSlice) strslice.StrSlice {
var tmpBuildEnv []string
for _, env := range buildArgVars {
key := strings.SplitN(env, "=", 2)[0]
if buildArgs.IsReferencedOrNotBuiltin(key) {
tmpBuildEnv = append(tmpBuildEnv, env)
}
}
sort.Strings(tmpBuildEnv)
tmpEnv := append([]string{fmt.Sprintf("|%d", len(tmpBuildEnv))}, tmpBuildEnv...)
return strslice.StrSlice(append(tmpEnv, cmd...))
}
// CMD foo
//
// Set the default command to run in the container (which may be empty).
// Argument handling is the same as RUN.
func dispatchCmd(d dispatchRequest, c *instructions.CmdCommand) error {
runConfig := d.state.runConfig
cmd, argsEscaped := resolveCmdLine(c.ShellDependantCmdLine, runConfig, d.state.operatingSystem, c.Name(), c.String())
// We warn here as Windows shell processing operates differently to Linux.
// Linux: /bin/sh -c "echo hello" world --> hello
// Windows: cmd /s /c "echo hello" world --> hello world
if d.state.operatingSystem == "windows" &&
len(runConfig.Entrypoint) > 0 &&
d.state.runConfig.ArgsEscaped != argsEscaped {
fmt.Fprintf(d.builder.Stderr, " ---> [Warning] Shell-form ENTRYPOINT and exec-form CMD may have unexpected results\n")
}
runConfig.Cmd = cmd
runConfig.ArgsEscaped = argsEscaped
if err := d.builder.commit(d.state, fmt.Sprintf("CMD %q", cmd)); err != nil {
return err
}
if len(c.ShellDependantCmdLine.CmdLine) != 0 {
d.state.cmdSet = true
}
return nil
}
// HEALTHCHECK foo
//
// Set the default healthcheck command to run in the container (which may be empty).
// Argument handling is the same as RUN.
func dispatchHealthcheck(d dispatchRequest, c *instructions.HealthCheckCommand) error {
runConfig := d.state.runConfig
if runConfig.Healthcheck != nil {
oldCmd := runConfig.Healthcheck.Test
if len(oldCmd) > 0 && oldCmd[0] != "NONE" {
fmt.Fprintf(d.builder.Stdout, "Note: overriding previous HEALTHCHECK: %v\n", oldCmd)
}
}
runConfig.Healthcheck = c.Health
return d.builder.commit(d.state, fmt.Sprintf("HEALTHCHECK %q", runConfig.Healthcheck))
}
// ENTRYPOINT /usr/sbin/nginx
//
// Set the entrypoint to /usr/sbin/nginx. Will accept the CMD as the arguments
// to /usr/sbin/nginx. Uses the default shell if not in JSON format.
//
// Handles command processing similar to CMD and RUN, only req.runConfig.Entrypoint
// is initialized at newBuilder time instead of through argument parsing.
func dispatchEntrypoint(d dispatchRequest, c *instructions.EntrypointCommand) error {
runConfig := d.state.runConfig
cmd, argsEscaped := resolveCmdLine(c.ShellDependantCmdLine, runConfig, d.state.operatingSystem, c.Name(), c.String())
// This warning is a little more complex than in dispatchCmd(), as the Windows base images (similar
// universally to almost every Linux image out there) have a single .Cmd field populated so that
// `docker run --rm image` starts the default shell which would typically be sh on Linux,
// or cmd on Windows. The catch to this is that if a dockerfile had `CMD ["c:\\windows\\system32\\cmd.exe"]`,
// we wouldn't be able to tell the difference. However, that would be highly unlikely, and besides, this
// is only trying to give a helpful warning of possibly unexpected results.
if d.state.operatingSystem == "windows" &&
d.state.runConfig.ArgsEscaped != argsEscaped &&
((len(runConfig.Cmd) == 1 && strings.ToLower(runConfig.Cmd[0]) != `c:\windows\system32\cmd.exe` && len(runConfig.Shell) == 0) || (len(runConfig.Cmd) > 1)) {
fmt.Fprintf(d.builder.Stderr, " ---> [Warning] Shell-form CMD and exec-form ENTRYPOINT may have unexpected results\n")
}
runConfig.Entrypoint = cmd
runConfig.ArgsEscaped = argsEscaped
if !d.state.cmdSet {
runConfig.Cmd = nil
}
return d.builder.commit(d.state, fmt.Sprintf("ENTRYPOINT %q", runConfig.Entrypoint))
}
// EXPOSE 6667/tcp 7000/tcp
//
// Expose ports for links and port mappings. This all ends up in
// req.runConfig.ExposedPorts for runconfig.
func dispatchExpose(d dispatchRequest, c *instructions.ExposeCommand, envs []string) error {
// custom multi word expansion
// expose $FOO with FOO="80 443" is expanded as EXPOSE [80,443]. This is the only command supporting word to words expansion
// so the word processing has been de-generalized
ports := []string{}
for _, p := range c.Ports {
ps, err := d.shlex.ProcessWords(p, envs)
if err != nil {
return err
}
ports = append(ports, ps...)
}
c.Ports = ports
ps, _, err := nat.ParsePortSpecs(ports)
if err != nil {
return err
}
if d.state.runConfig.ExposedPorts == nil {
d.state.runConfig.ExposedPorts = make(nat.PortSet)
}
for p := range ps {
d.state.runConfig.ExposedPorts[p] = struct{}{}
}
return d.builder.commit(d.state, "EXPOSE "+strings.Join(c.Ports, " "))
}
// USER foo
//
// Set the user to 'foo' for future commands and when running the
// ENTRYPOINT/CMD at container run time.
func dispatchUser(d dispatchRequest, c *instructions.UserCommand) error {
d.state.runConfig.User = c.User
return d.builder.commit(d.state, fmt.Sprintf("USER %v", c.User))
}
// VOLUME /foo
//
// Expose the volume /foo for use. Will also accept the JSON array form.
func dispatchVolume(d dispatchRequest, c *instructions.VolumeCommand) error {
if d.state.runConfig.Volumes == nil {
d.state.runConfig.Volumes = map[string]struct{}{}
}
for _, v := range c.Volumes {
if v == "" {
return errors.New("VOLUME specified can not be an empty string")
}
d.state.runConfig.Volumes[v] = struct{}{}
}
return d.builder.commit(d.state, fmt.Sprintf("VOLUME %v", c.Volumes))
}
// STOPSIGNAL signal
//
// Set the signal that will be used to kill the container.
func dispatchStopSignal(d dispatchRequest, c *instructions.StopSignalCommand) error {
_, err := signal.ParseSignal(c.Signal)
if err != nil {
return errdefs.InvalidParameter(err)
}
d.state.runConfig.StopSignal = c.Signal
return d.builder.commit(d.state, fmt.Sprintf("STOPSIGNAL %v", c.Signal))
}
// ARG name[=value]
//
// Adds the variable foo to the trusted list of variables that can be passed
// to builder using the --build-arg flag for expansion/substitution or passing to 'run'.
// Dockerfile author may optionally set a default value of this variable.
func dispatchArg(d dispatchRequest, c *instructions.ArgCommand) error {
var commitStr strings.Builder
commitStr.WriteString("ARG ")
for i, arg := range c.Args {
if i > 0 {
commitStr.WriteString(" ")
}
commitStr.WriteString(arg.Key)
if arg.Value != nil {
commitStr.WriteString("=")
commitStr.WriteString(*arg.Value)
}
d.state.buildArgs.AddArg(arg.Key, arg.Value)
}
return d.builder.commit(d.state, commitStr.String())
}
// SHELL powershell -command
//
// Set the non-default shell to use.
func dispatchShell(d dispatchRequest, c *instructions.ShellCommand) error {
d.state.runConfig.Shell = c.Shell
return d.builder.commit(d.state, fmt.Sprintf("SHELL %v", d.state.runConfig.Shell))
}