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build.go
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build.go
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package commands
import (
"context"
"os"
"strings"
"github.com/docker/buildx/build"
"github.com/docker/buildx/util/platformutil"
"github.com/docker/buildx/util/progress"
"github.com/docker/cli/cli"
"github.com/docker/cli/cli/command"
"github.com/moby/buildkit/client"
"github.com/moby/buildkit/session/auth/authprovider"
"github.com/moby/buildkit/util/appcontext"
"github.com/pkg/errors"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
)
type buildOptions struct {
commonOptions
contextPath string
dockerfileName string
tags []string
labels []string
buildArgs []string
cacheFrom []string
cacheTo []string
target string
platforms []string
secrets []string
ssh []string
outputs []string
imageIDFile string
extraHosts []string
networkMode string
exportPush bool
exportLoad bool
// unimplemented
squash bool
quiet bool
// hidden
// untrusted bool
// ulimits *opts.UlimitOpt
// memory opts.MemBytes
// memorySwap opts.MemSwapBytes
// shmSize opts.MemBytes
// cpuShares int64
// cpuPeriod int64
// cpuQuota int64
// cpuSetCpus string
// cpuSetMems string
// cgroupParent string
// isolation string
// compress bool
// securityOpt []string
}
type commonOptions struct {
noCache bool
progress string
pull bool
}
func runBuild(dockerCli command.Cli, in buildOptions) error {
if in.squash {
return errors.Errorf("squash currently not implemented")
}
if in.quiet {
return errors.Errorf("quiet currently not implemented")
}
ctx := appcontext.Context()
opts := build.Options{
Inputs: build.Inputs{
ContextPath: in.contextPath,
DockerfilePath: in.dockerfileName,
InStream: os.Stdin,
},
Tags: in.tags,
Labels: listToMap(in.labels),
BuildArgs: listToMap(in.buildArgs),
Pull: in.pull,
NoCache: in.noCache,
Target: in.target,
ImageIDFile: in.imageIDFile,
ExtraHosts: in.extraHosts,
NetworkMode: in.networkMode,
}
platforms, err := platformutil.Parse(in.platforms)
if err != nil {
return err
}
opts.Platforms = platforms
opts.Session = append(opts.Session, authprovider.NewDockerAuthProvider(os.Stderr))
secrets, err := build.ParseSecretSpecs(in.secrets)
if err != nil {
return err
}
opts.Session = append(opts.Session, secrets)
ssh, err := build.ParseSSHSpecs(in.ssh)
if err != nil {
return err
}
opts.Session = append(opts.Session, ssh)
outputs, err := build.ParseOutputs(in.outputs)
if err != nil {
return err
}
if in.exportPush {
if in.exportLoad {
return errors.Errorf("push and load may not be set together at the moment")
}
if len(outputs) == 0 {
outputs = []client.ExportEntry{{
Type: "image",
Attrs: map[string]string{
"push": "true",
},
}}
} else {
switch outputs[0].Type {
case "image":
outputs[0].Attrs["push"] = "true"
default:
return errors.Errorf("push and %q output can't be used together", outputs[0].Type)
}
}
}
if in.exportLoad {
if len(outputs) == 0 {
outputs = []client.ExportEntry{{
Type: "docker",
Attrs: map[string]string{},
}}
} else {
switch outputs[0].Type {
case "docker":
default:
return errors.Errorf("load and %q output can't be used together", outputs[0].Type)
}
}
}
opts.Exports = outputs
cacheImports, err := build.ParseCacheEntry(in.cacheFrom)
if err != nil {
return err
}
opts.CacheFrom = cacheImports
cacheExports, err := build.ParseCacheEntry(in.cacheTo)
if err != nil {
return err
}
opts.CacheTo = cacheExports
return buildTargets(ctx, dockerCli, map[string]build.Options{"default": opts}, in.progress)
}
func buildTargets(ctx context.Context, dockerCli command.Cli, opts map[string]build.Options, progressMode string) error {
dis, err := getDefaultDrivers(ctx, dockerCli)
if err != nil {
return err
}
ctx2, cancel := context.WithCancel(context.TODO())
defer cancel()
pw := progress.NewPrinter(ctx2, os.Stderr, progressMode)
_, err = build.Build(ctx, dis, opts, dockerAPI(dockerCli), dockerCli.ConfigFile(), pw)
return err
}
func buildCmd(dockerCli command.Cli) *cobra.Command {
var options buildOptions
cmd := &cobra.Command{
Use: "build [OPTIONS] PATH | URL | -",
Aliases: []string{"b"},
Short: "Start a build",
Args: cli.ExactArgs(1),
RunE: func(cmd *cobra.Command, args []string) error {
options.contextPath = args[0]
return runBuild(dockerCli, options)
},
}
flags := cmd.Flags()
flags.BoolVar(&options.exportPush, "push", false, "Shorthand for --output=type=registry")
flags.BoolVar(&options.exportLoad, "load", false, "Shorthand for --output=type=docker")
flags.StringArrayVarP(&options.tags, "tag", "t", []string{}, "Name and optionally a tag in the 'name:tag' format")
flags.StringArrayVar(&options.buildArgs, "build-arg", []string{}, "Set build-time variables")
flags.StringVarP(&options.dockerfileName, "file", "f", "", "Name of the Dockerfile (Default is 'PATH/Dockerfile')")
flags.StringArrayVar(&options.labels, "label", []string{}, "Set metadata for an image")
flags.StringArrayVar(&options.cacheFrom, "cache-from", []string{}, "External cache sources (eg. user/app:cache, type=local,src=path/to/dir)")
flags.StringArrayVar(&options.cacheTo, "cache-to", []string{}, "Cache export destinations (eg. user/app:cache, type=local,dest=path/to/dir)")
flags.StringVar(&options.target, "target", "", "Set the target build stage to build.")
// not implemented
flags.BoolVarP(&options.quiet, "quiet", "q", false, "Suppress the build output and print image ID on success")
flags.StringVar(&options.networkMode, "network", "default", "Set the networking mode for the RUN instructions during build")
flags.StringSliceVar(&options.extraHosts, "add-host", []string{}, "Add a custom host-to-IP mapping (host:ip)")
flags.StringVar(&options.imageIDFile, "iidfile", "", "Write the image ID to the file")
flags.BoolVar(&options.squash, "squash", false, "Squash newly built layers into a single new layer")
flags.MarkHidden("quiet")
flags.MarkHidden("squash")
// hidden flags
var ignore string
var ignoreSlice []string
var ignoreBool bool
var ignoreInt int64
flags.StringVar(&ignore, "ulimit", "", "Ulimit options")
flags.MarkHidden("ulimit")
flags.StringSliceVar(&ignoreSlice, "security-opt", []string{}, "Security options")
flags.MarkHidden("security-opt")
flags.BoolVar(&ignoreBool, "compress", false, "Compress the build context using gzip")
flags.MarkHidden("compress")
flags.StringVarP(&ignore, "memory", "m", "", "Memory limit")
flags.MarkHidden("memory")
flags.StringVar(&ignore, "memory-swap", "", "Swap limit equal to memory plus swap: '-1' to enable unlimited swap")
flags.MarkHidden("memory-swap")
flags.StringVar(&ignore, "shm-size", "", "Size of /dev/shm")
flags.MarkHidden("shm-size")
flags.Int64VarP(&ignoreInt, "cpu-shares", "c", 0, "CPU shares (relative weight)")
flags.MarkHidden("cpu-shares")
flags.Int64Var(&ignoreInt, "cpu-period", 0, "Limit the CPU CFS (Completely Fair Scheduler) period")
flags.MarkHidden("cpu-period")
flags.Int64Var(&ignoreInt, "cpu-quota", 0, "Limit the CPU CFS (Completely Fair Scheduler) quota")
flags.MarkHidden("cpu-quota")
flags.StringVar(&ignore, "cpuset-cpus", "", "CPUs in which to allow execution (0-3, 0,1)")
flags.MarkHidden("cpuset-cpus")
flags.StringVar(&ignore, "cpuset-mems", "", "MEMs in which to allow execution (0-3, 0,1)")
flags.MarkHidden("cpuset-mems")
flags.StringVar(&ignore, "cgroup-parent", "", "Optional parent cgroup for the container")
flags.MarkHidden("cgroup-parent")
flags.StringVar(&ignore, "isolation", "", "Container isolation technology")
flags.MarkHidden("isolation")
flags.BoolVar(&ignoreBool, "rm", true, "Remove intermediate containers after a successful build")
flags.MarkHidden("rm")
flags.BoolVar(&ignoreBool, "force-rm", false, "Always remove intermediate containers")
flags.MarkHidden("force-rm")
platformsDefault := []string{}
if v := os.Getenv("DOCKER_DEFAULT_PLATFORM"); v != "" {
platformsDefault = []string{v}
}
flags.StringArrayVar(&options.platforms, "platform", platformsDefault, "Set target platform for build")
flags.StringArrayVar(&options.secrets, "secret", []string{}, "Secret file to expose to the build: id=mysecret,src=/local/secret")
flags.StringArrayVar(&options.ssh, "ssh", []string{}, "SSH agent socket or keys to expose to the build (format: default|<id>[=<socket>|<key>[,<key>]])")
flags.StringArrayVarP(&options.outputs, "output", "o", []string{}, "Output destination (format: type=local,dest=path)")
commonFlags(&options.commonOptions, flags)
return cmd
}
func commonFlags(options *commonOptions, flags *pflag.FlagSet) {
flags.BoolVar(&options.noCache, "no-cache", false, "Do not use cache when building the image")
flags.StringVar(&options.progress, "progress", "auto", "Set type of progress output (auto, plain, tty). Use plain to show container output")
flags.BoolVar(&options.pull, "pull", false, "Always attempt to pull a newer version of the image")
}
func listToMap(values []string) map[string]string {
result := make(map[string]string, len(values))
for _, value := range values {
kv := strings.SplitN(value, "=", 2)
if len(kv) == 1 {
result[kv[0]] = ""
} else {
result[kv[0]] = kv[1]
}
}
return result
}