mirror of
https://github.com/moby/moby.git
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4ce93940b7
The error message suggests you need one argument even when you have provided one. Suggest having another argument. Signed-off-by: Justin Cormack <justin.cormack@docker.com>
778 lines
21 KiB
Go
778 lines
21 KiB
Go
package dockerfile
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// This file contains the dispatchers for each command. Note that
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// `nullDispatch` is not actually a command, but support for commands we parse
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// but do nothing with.
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//
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// See evaluator.go for a higher level discussion of the whole evaluator
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// package.
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import (
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"fmt"
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"regexp"
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"runtime"
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"sort"
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"strconv"
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"strings"
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"time"
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"github.com/Sirupsen/logrus"
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"github.com/docker/docker/api"
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"github.com/docker/docker/builder"
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"github.com/docker/docker/pkg/signal"
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runconfigopts "github.com/docker/docker/runconfig/opts"
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"github.com/docker/engine-api/types/container"
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"github.com/docker/engine-api/types/strslice"
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"github.com/docker/go-connections/nat"
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)
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// ENV foo bar
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//
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// Sets the environment variable foo to bar, also makes interpolation
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// in the dockerfile available from the next statement on via ${foo}.
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//
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func env(b *Builder, args []string, attributes map[string]bool, original string) error {
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if len(args) == 0 {
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return errAtLeastOneArgument("ENV")
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}
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if len(args)%2 != 0 {
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// should never get here, but just in case
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return errTooManyArguments("ENV")
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}
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if err := b.flags.Parse(); err != nil {
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return err
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}
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// TODO/FIXME/NOT USED
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// Just here to show how to use the builder flags stuff within the
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// context of a builder command. Will remove once we actually add
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// a builder command to something!
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/*
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flBool1 := b.flags.AddBool("bool1", false)
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flStr1 := b.flags.AddString("str1", "HI")
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if err := b.flags.Parse(); err != nil {
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return err
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}
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fmt.Printf("Bool1:%v\n", flBool1)
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fmt.Printf("Str1:%v\n", flStr1)
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*/
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commitStr := "ENV"
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for j := 0; j < len(args); j++ {
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// name ==> args[j]
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// value ==> args[j+1]
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if len(args[j]) == 0 {
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return fmt.Errorf("ENV names can not be blank")
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}
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newVar := args[j] + "=" + args[j+1] + ""
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commitStr += " " + newVar
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gotOne := false
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for i, envVar := range b.runConfig.Env {
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envParts := strings.SplitN(envVar, "=", 2)
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if envParts[0] == args[j] {
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b.runConfig.Env[i] = newVar
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gotOne = true
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break
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}
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}
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if !gotOne {
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b.runConfig.Env = append(b.runConfig.Env, newVar)
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}
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j++
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}
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return b.commit("", b.runConfig.Cmd, commitStr)
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}
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// MAINTAINER some text <maybe@an.email.address>
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//
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// Sets the maintainer metadata.
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func maintainer(b *Builder, args []string, attributes map[string]bool, original string) error {
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if len(args) != 1 {
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return errExactlyOneArgument("MAINTAINER")
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}
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if err := b.flags.Parse(); err != nil {
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return err
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}
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b.maintainer = args[0]
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return b.commit("", b.runConfig.Cmd, fmt.Sprintf("MAINTAINER %s", b.maintainer))
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}
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// LABEL some json data describing the image
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//
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// Sets the Label variable foo to bar,
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//
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func label(b *Builder, args []string, attributes map[string]bool, original string) error {
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if len(args) == 0 {
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return errAtLeastOneArgument("LABEL")
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}
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if len(args)%2 != 0 {
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// should never get here, but just in case
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return errTooManyArguments("LABEL")
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}
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if err := b.flags.Parse(); err != nil {
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return err
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}
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commitStr := "LABEL"
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if b.runConfig.Labels == nil {
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b.runConfig.Labels = map[string]string{}
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}
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for j := 0; j < len(args); j++ {
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// name ==> args[j]
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// value ==> args[j+1]
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if len(args[j]) == 0 {
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return fmt.Errorf("LABEL names can not be blank")
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}
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newVar := args[j] + "=" + args[j+1] + ""
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commitStr += " " + newVar
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b.runConfig.Labels[args[j]] = args[j+1]
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j++
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}
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return b.commit("", b.runConfig.Cmd, commitStr)
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}
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// ADD foo /path
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//
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// Add the file 'foo' to '/path'. Tarball and Remote URL (git, http) handling
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// exist here. If you do not wish to have this automatic handling, use COPY.
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//
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func add(b *Builder, args []string, attributes map[string]bool, original string) error {
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if len(args) < 2 {
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return errAtLeastTwoArguments("ADD")
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}
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if err := b.flags.Parse(); err != nil {
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return err
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}
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return b.runContextCommand(args, true, true, "ADD")
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}
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// COPY foo /path
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//
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// Same as 'ADD' but without the tar and remote url handling.
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//
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func dispatchCopy(b *Builder, args []string, attributes map[string]bool, original string) error {
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if len(args) < 2 {
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return errAtLeastTwoArguments("COPY")
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}
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if err := b.flags.Parse(); err != nil {
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return err
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}
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return b.runContextCommand(args, false, false, "COPY")
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}
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// FROM imagename
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//
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// This sets the image the dockerfile will build on top of.
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//
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func from(b *Builder, args []string, attributes map[string]bool, original string) error {
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if len(args) != 1 {
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return errExactlyOneArgument("FROM")
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}
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if err := b.flags.Parse(); err != nil {
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return err
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}
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name := args[0]
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var (
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image builder.Image
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err error
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)
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// Windows cannot support a container with no base image.
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if name == api.NoBaseImageSpecifier {
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if runtime.GOOS == "windows" {
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return fmt.Errorf("Windows does not support FROM scratch")
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}
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b.image = ""
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b.noBaseImage = true
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} else {
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// TODO: don't use `name`, instead resolve it to a digest
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if !b.options.PullParent {
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image, err = b.docker.GetImageOnBuild(name)
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// TODO: shouldn't we error out if error is different from "not found" ?
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}
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if image == nil {
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image, err = b.docker.PullOnBuild(b.clientCtx, name, b.options.AuthConfigs, b.Output)
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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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}
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return b.processImageFrom(image)
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}
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// ONBUILD RUN echo yo
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//
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// ONBUILD triggers run when the image is used in a FROM statement.
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//
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// ONBUILD handling has a lot of special-case functionality, the heading in
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// evaluator.go and comments around dispatch() in the same file explain the
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// special cases. search for 'OnBuild' in internals.go for additional special
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// cases.
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//
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func onbuild(b *Builder, args []string, attributes map[string]bool, original string) error {
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if len(args) == 0 {
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return errAtLeastOneArgument("ONBUILD")
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}
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if err := b.flags.Parse(); err != nil {
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return err
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}
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triggerInstruction := strings.ToUpper(strings.TrimSpace(args[0]))
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switch triggerInstruction {
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case "ONBUILD":
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return fmt.Errorf("Chaining ONBUILD via `ONBUILD ONBUILD` isn't allowed")
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case "MAINTAINER", "FROM":
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return fmt.Errorf("%s isn't allowed as an ONBUILD trigger", triggerInstruction)
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}
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original = regexp.MustCompile(`(?i)^\s*ONBUILD\s*`).ReplaceAllString(original, "")
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b.runConfig.OnBuild = append(b.runConfig.OnBuild, original)
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return b.commit("", b.runConfig.Cmd, fmt.Sprintf("ONBUILD %s", original))
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}
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// WORKDIR /tmp
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//
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// Set the working directory for future RUN/CMD/etc statements.
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//
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func workdir(b *Builder, args []string, attributes map[string]bool, original string) error {
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if len(args) != 1 {
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return errExactlyOneArgument("WORKDIR")
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}
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err := b.flags.Parse()
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if err != nil {
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return err
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}
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// This is from the Dockerfile and will not necessarily be in platform
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// specific semantics, hence ensure it is converted.
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b.runConfig.WorkingDir, err = normaliseWorkdir(b.runConfig.WorkingDir, args[0])
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if err != nil {
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return err
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}
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return b.commit("", b.runConfig.Cmd, fmt.Sprintf("WORKDIR %v", b.runConfig.WorkingDir))
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}
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// RUN some command yo
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//
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// run a command and commit the image. Args are automatically prepended with
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// the current SHELL which defaults to 'sh -c' under linux or 'cmd /S /C' under
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// Windows, in the event there is only one argument The difference in processing:
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//
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// RUN echo hi # sh -c echo hi (Linux)
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// RUN echo hi # cmd /S /C echo hi (Windows)
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// RUN [ "echo", "hi" ] # echo hi
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//
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func run(b *Builder, args []string, attributes map[string]bool, original string) error {
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if b.image == "" && !b.noBaseImage {
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return fmt.Errorf("Please provide a source image with `from` prior to run")
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}
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if err := b.flags.Parse(); err != nil {
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return err
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}
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args = handleJSONArgs(args, attributes)
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if !attributes["json"] {
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args = append(getShell(b.runConfig), args...)
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}
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config := &container.Config{
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Cmd: strslice.StrSlice(args),
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Image: b.image,
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}
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// stash the cmd
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cmd := b.runConfig.Cmd
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if len(b.runConfig.Entrypoint) == 0 && len(b.runConfig.Cmd) == 0 {
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b.runConfig.Cmd = config.Cmd
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}
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// stash the config environment
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env := b.runConfig.Env
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defer func(cmd strslice.StrSlice) { b.runConfig.Cmd = cmd }(cmd)
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defer func(env []string) { b.runConfig.Env = env }(env)
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// derive the net build-time environment for this run. We let config
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// environment override the build time environment.
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// This means that we take the b.buildArgs list of env vars and remove
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// any of those variables that are defined as part of the container. In other
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// words, anything in b.Config.Env. What's left is the list of build-time env
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// vars that we need to add to each RUN command - note the list could be empty.
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//
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// We don't persist the build time environment with container's config
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// environment, but just sort and prepend it to the command string at time
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// of commit.
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// This helps with tracing back the image's actual environment at the time
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// of RUN, without leaking it to the final image. It also aids cache
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// lookup for same image built with same build time environment.
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cmdBuildEnv := []string{}
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configEnv := runconfigopts.ConvertKVStringsToMap(b.runConfig.Env)
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for key, val := range b.options.BuildArgs {
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if !b.isBuildArgAllowed(key) {
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// skip build-args that are not in allowed list, meaning they have
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// not been defined by an "ARG" Dockerfile command yet.
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// This is an error condition but only if there is no "ARG" in the entire
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// Dockerfile, so we'll generate any necessary errors after we parsed
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// the entire file (see 'leftoverArgs' processing in evaluator.go )
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continue
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}
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if _, ok := configEnv[key]; !ok {
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cmdBuildEnv = append(cmdBuildEnv, fmt.Sprintf("%s=%s", key, val))
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}
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}
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// derive the command to use for probeCache() and to commit in this container.
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// Note that we only do this if there are any build-time env vars. Also, we
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// use the special argument "|#" at the start of the args array. This will
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// avoid conflicts with any RUN command since commands can not
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// start with | (vertical bar). The "#" (number of build envs) is there to
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// help ensure proper cache matches. We don't want a RUN command
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// that starts with "foo=abc" to be considered part of a build-time env var.
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saveCmd := config.Cmd
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if len(cmdBuildEnv) > 0 {
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sort.Strings(cmdBuildEnv)
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tmpEnv := append([]string{fmt.Sprintf("|%d", len(cmdBuildEnv))}, cmdBuildEnv...)
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saveCmd = strslice.StrSlice(append(tmpEnv, saveCmd...))
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}
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b.runConfig.Cmd = saveCmd
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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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// set Cmd manually, this is special case only for Dockerfiles
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b.runConfig.Cmd = config.Cmd
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// set build-time environment for 'run'.
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b.runConfig.Env = append(b.runConfig.Env, cmdBuildEnv...)
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// set config as already being escaped, this prevents double escaping on windows
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b.runConfig.ArgsEscaped = true
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logrus.Debugf("[BUILDER] Command to be executed: %v", b.runConfig.Cmd)
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cID, err := b.create()
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if err != nil {
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return err
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}
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if err := b.run(cID); err != nil {
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return err
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}
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// revert to original config environment and set the command string to
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// have the build-time env vars in it (if any) so that future cache look-ups
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// properly match it.
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b.runConfig.Env = env
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b.runConfig.Cmd = saveCmd
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return b.commit(cID, cmd, "run")
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}
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// CMD foo
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//
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// Set the default command to run in the container (which may be empty).
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// Argument handling is the same as RUN.
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//
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func cmd(b *Builder, args []string, attributes map[string]bool, original string) error {
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if err := b.flags.Parse(); err != nil {
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return err
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}
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cmdSlice := handleJSONArgs(args, attributes)
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if !attributes["json"] {
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cmdSlice = append(getShell(b.runConfig), cmdSlice...)
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}
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b.runConfig.Cmd = strslice.StrSlice(cmdSlice)
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// set config as already being escaped, this prevents double escaping on windows
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b.runConfig.ArgsEscaped = true
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if err := b.commit("", b.runConfig.Cmd, fmt.Sprintf("CMD %q", cmdSlice)); err != nil {
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return err
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}
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if len(args) != 0 {
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b.cmdSet = true
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}
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return nil
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}
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// parseOptInterval(flag) is the duration of flag.Value, or 0 if
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// empty. An error is reported if the value is given and is not positive.
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func parseOptInterval(f *Flag) (time.Duration, error) {
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s := f.Value
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if s == "" {
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return 0, nil
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}
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d, err := time.ParseDuration(s)
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if err != nil {
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return 0, err
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}
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if d <= 0 {
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return 0, fmt.Errorf("Interval %#v must be positive", f.name)
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}
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return d, nil
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}
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// HEALTHCHECK foo
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//
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// Set the default healthcheck command to run in the container (which may be empty).
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// Argument handling is the same as RUN.
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//
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func healthcheck(b *Builder, args []string, attributes map[string]bool, original string) error {
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if len(args) == 0 {
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return fmt.Errorf("HEALTHCHECK requires an argument")
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}
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typ := strings.ToUpper(args[0])
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args = args[1:]
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if typ == "NONE" {
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if len(args) != 0 {
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return fmt.Errorf("HEALTHCHECK NONE takes no arguments")
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}
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test := strslice.StrSlice{typ}
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b.runConfig.Healthcheck = &container.HealthConfig{
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Test: test,
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}
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} else {
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if b.runConfig.Healthcheck != nil {
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oldCmd := b.runConfig.Healthcheck.Test
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if len(oldCmd) > 0 && oldCmd[0] != "NONE" {
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fmt.Fprintf(b.Stdout, "Note: overriding previous HEALTHCHECK: %v\n", oldCmd)
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}
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}
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healthcheck := container.HealthConfig{}
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flInterval := b.flags.AddString("interval", "")
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flTimeout := b.flags.AddString("timeout", "")
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flRetries := b.flags.AddString("retries", "")
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if err := b.flags.Parse(); err != nil {
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return err
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}
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switch typ {
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case "CMD":
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cmdSlice := handleJSONArgs(args, attributes)
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if len(cmdSlice) == 0 {
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return fmt.Errorf("Missing command after HEALTHCHECK CMD")
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}
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if !attributes["json"] {
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typ = "CMD-SHELL"
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}
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healthcheck.Test = strslice.StrSlice(append([]string{typ}, cmdSlice...))
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default:
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return fmt.Errorf("Unknown type %#v in HEALTHCHECK (try CMD)", typ)
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}
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interval, err := parseOptInterval(flInterval)
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if err != nil {
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return err
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}
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healthcheck.Interval = interval
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timeout, err := parseOptInterval(flTimeout)
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if err != nil {
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return err
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}
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healthcheck.Timeout = timeout
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if flRetries.Value != "" {
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retries, err := strconv.ParseInt(flRetries.Value, 10, 32)
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if err != nil {
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return err
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}
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if retries < 1 {
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return fmt.Errorf("--retries must be at least 1 (not %d)", retries)
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}
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healthcheck.Retries = int(retries)
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} else {
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healthcheck.Retries = 0
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}
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b.runConfig.Healthcheck = &healthcheck
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}
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if err := b.commit("", b.runConfig.Cmd, fmt.Sprintf("HEALTHCHECK %q", b.runConfig.Healthcheck)); err != nil {
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return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// 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 b.runConfig.Entrypoint
|
|
// is initialized at NewBuilder time instead of through argument parsing.
|
|
//
|
|
func entrypoint(b *Builder, args []string, attributes map[string]bool, original string) error {
|
|
if err := b.flags.Parse(); err != nil {
|
|
return err
|
|
}
|
|
|
|
parsed := handleJSONArgs(args, attributes)
|
|
|
|
switch {
|
|
case attributes["json"]:
|
|
// ENTRYPOINT ["echo", "hi"]
|
|
b.runConfig.Entrypoint = strslice.StrSlice(parsed)
|
|
case len(parsed) == 0:
|
|
// ENTRYPOINT []
|
|
b.runConfig.Entrypoint = nil
|
|
default:
|
|
// ENTRYPOINT echo hi
|
|
b.runConfig.Entrypoint = strslice.StrSlice(append(getShell(b.runConfig), parsed[0]))
|
|
}
|
|
|
|
// when setting the entrypoint if a CMD was not explicitly set then
|
|
// set the command to nil
|
|
if !b.cmdSet {
|
|
b.runConfig.Cmd = nil
|
|
}
|
|
|
|
if err := b.commit("", b.runConfig.Cmd, fmt.Sprintf("ENTRYPOINT %q", b.runConfig.Entrypoint)); err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// EXPOSE 6667/tcp 7000/tcp
|
|
//
|
|
// Expose ports for links and port mappings. This all ends up in
|
|
// b.runConfig.ExposedPorts for runconfig.
|
|
//
|
|
func expose(b *Builder, args []string, attributes map[string]bool, original string) error {
|
|
portsTab := args
|
|
|
|
if len(args) == 0 {
|
|
return errAtLeastOneArgument("EXPOSE")
|
|
}
|
|
|
|
if err := b.flags.Parse(); err != nil {
|
|
return err
|
|
}
|
|
|
|
if b.runConfig.ExposedPorts == nil {
|
|
b.runConfig.ExposedPorts = make(nat.PortSet)
|
|
}
|
|
|
|
ports, _, err := nat.ParsePortSpecs(portsTab)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// instead of using ports directly, we build a list of ports and sort it so
|
|
// the order is consistent. This prevents cache burst where map ordering
|
|
// changes between builds
|
|
portList := make([]string, len(ports))
|
|
var i int
|
|
for port := range ports {
|
|
if _, exists := b.runConfig.ExposedPorts[port]; !exists {
|
|
b.runConfig.ExposedPorts[port] = struct{}{}
|
|
}
|
|
portList[i] = string(port)
|
|
i++
|
|
}
|
|
sort.Strings(portList)
|
|
return b.commit("", b.runConfig.Cmd, fmt.Sprintf("EXPOSE %s", strings.Join(portList, " ")))
|
|
}
|
|
|
|
// USER foo
|
|
//
|
|
// Set the user to 'foo' for future commands and when running the
|
|
// ENTRYPOINT/CMD at container run time.
|
|
//
|
|
func user(b *Builder, args []string, attributes map[string]bool, original string) error {
|
|
if len(args) != 1 {
|
|
return errExactlyOneArgument("USER")
|
|
}
|
|
|
|
if err := b.flags.Parse(); err != nil {
|
|
return err
|
|
}
|
|
|
|
b.runConfig.User = args[0]
|
|
return b.commit("", b.runConfig.Cmd, fmt.Sprintf("USER %v", args))
|
|
}
|
|
|
|
// VOLUME /foo
|
|
//
|
|
// Expose the volume /foo for use. Will also accept the JSON array form.
|
|
//
|
|
func volume(b *Builder, args []string, attributes map[string]bool, original string) error {
|
|
if len(args) == 0 {
|
|
return errAtLeastOneArgument("VOLUME")
|
|
}
|
|
|
|
if err := b.flags.Parse(); err != nil {
|
|
return err
|
|
}
|
|
|
|
if b.runConfig.Volumes == nil {
|
|
b.runConfig.Volumes = map[string]struct{}{}
|
|
}
|
|
for _, v := range args {
|
|
v = strings.TrimSpace(v)
|
|
if v == "" {
|
|
return fmt.Errorf("Volume specified can not be an empty string")
|
|
}
|
|
b.runConfig.Volumes[v] = struct{}{}
|
|
}
|
|
if err := b.commit("", b.runConfig.Cmd, fmt.Sprintf("VOLUME %v", args)); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// STOPSIGNAL signal
|
|
//
|
|
// Set the signal that will be used to kill the container.
|
|
func stopSignal(b *Builder, args []string, attributes map[string]bool, original string) error {
|
|
if len(args) != 1 {
|
|
return fmt.Errorf("STOPSIGNAL requires exactly one argument")
|
|
}
|
|
|
|
sig := args[0]
|
|
_, err := signal.ParseSignal(sig)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
b.runConfig.StopSignal = sig
|
|
return b.commit("", b.runConfig.Cmd, fmt.Sprintf("STOPSIGNAL %v", args))
|
|
}
|
|
|
|
// 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/subsitution or passing to 'run'.
|
|
// Dockerfile author may optionally set a default value of this variable.
|
|
func arg(b *Builder, args []string, attributes map[string]bool, original string) error {
|
|
if len(args) != 1 {
|
|
return fmt.Errorf("ARG requires exactly one argument definition")
|
|
}
|
|
|
|
var (
|
|
name string
|
|
value string
|
|
hasDefault bool
|
|
)
|
|
|
|
arg := args[0]
|
|
// 'arg' can just be a name or name-value pair. Note that this is different
|
|
// from 'env' that handles the split of name and value at the parser level.
|
|
// The reason for doing it differently for 'arg' is that we support just
|
|
// defining an arg and not assign it a value (while 'env' always expects a
|
|
// name-value pair). If possible, it will be good to harmonize the two.
|
|
if strings.Contains(arg, "=") {
|
|
parts := strings.SplitN(arg, "=", 2)
|
|
if len(parts[0]) == 0 {
|
|
return fmt.Errorf("ARG names can not be blank")
|
|
}
|
|
|
|
name = parts[0]
|
|
value = parts[1]
|
|
hasDefault = true
|
|
} else {
|
|
name = arg
|
|
hasDefault = false
|
|
}
|
|
// add the arg to allowed list of build-time args from this step on.
|
|
b.allowedBuildArgs[name] = true
|
|
|
|
// If there is a default value associated with this arg then add it to the
|
|
// b.buildArgs if one is not already passed to the builder. The args passed
|
|
// to builder override the default value of 'arg'.
|
|
if _, ok := b.options.BuildArgs[name]; !ok && hasDefault {
|
|
b.options.BuildArgs[name] = value
|
|
}
|
|
|
|
return b.commit("", b.runConfig.Cmd, fmt.Sprintf("ARG %s", arg))
|
|
}
|
|
|
|
// SHELL powershell -command
|
|
//
|
|
// Set the non-default shell to use.
|
|
func shell(b *Builder, args []string, attributes map[string]bool, original string) error {
|
|
if err := b.flags.Parse(); err != nil {
|
|
return err
|
|
}
|
|
shellSlice := handleJSONArgs(args, attributes)
|
|
switch {
|
|
case len(shellSlice) == 0:
|
|
// SHELL []
|
|
return errAtLeastOneArgument("SHELL")
|
|
case attributes["json"]:
|
|
// SHELL ["powershell", "-command"]
|
|
b.runConfig.Shell = strslice.StrSlice(shellSlice)
|
|
default:
|
|
// SHELL powershell -command - not JSON
|
|
return errNotJSON("SHELL", original)
|
|
}
|
|
return b.commit("", b.runConfig.Cmd, fmt.Sprintf("SHELL %v", shellSlice))
|
|
}
|
|
|
|
func errAtLeastOneArgument(command string) error {
|
|
return fmt.Errorf("%s requires at least one argument", command)
|
|
}
|
|
|
|
func errExactlyOneArgument(command string) error {
|
|
return fmt.Errorf("%s requires exactly one argument", command)
|
|
}
|
|
|
|
func errAtLeastTwoArguments(command string) error {
|
|
return fmt.Errorf("%s requires at least two arguments", command)
|
|
}
|
|
|
|
func errTooManyArguments(command string) error {
|
|
return fmt.Errorf("Bad input to %s, too many arguments", command)
|
|
}
|
|
|
|
// getShell is a helper function which gets the right shell for prefixing the
|
|
// shell-form of RUN, ENTRYPOINT and CMD instructions
|
|
func getShell(c *container.Config) []string {
|
|
if 0 == len(c.Shell) {
|
|
return defaultShell[:]
|
|
}
|
|
return c.Shell[:]
|
|
}
|