forked from moby/buildkit
/
build.go
480 lines (430 loc) · 12 KB
/
build.go
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package builder
import (
"archive/tar"
"bytes"
"context"
"encoding/csv"
"encoding/json"
"fmt"
"net"
"regexp"
"strconv"
"strings"
"github.com/containerd/containerd/platforms"
"github.com/docker/docker/builder/dockerignore"
"github.com/moby/buildkit/client/llb"
"github.com/moby/buildkit/exporter/containerimage/exptypes"
"github.com/moby/buildkit/frontend/dockerfile/dockerfile2llb"
"github.com/moby/buildkit/frontend/gateway/client"
"github.com/moby/buildkit/solver/pb"
specs "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
"golang.org/x/sync/errgroup"
)
const (
LocalNameContext = "context"
LocalNameDockerfile = "dockerfile"
keyTarget = "target"
keyFilename = "filename"
keyCacheFrom = "cache-from"
defaultDockerfileName = "Dockerfile"
dockerignoreFilename = ".dockerignore"
buildArgPrefix = "build-arg:"
labelPrefix = "label:"
keyNoCache = "no-cache"
keyTargetPlatform = "platform"
keyMultiPlatform = "multi-platform"
keyImageResolveMode = "image-resolve-mode"
keyGlobalAddHosts = "add-hosts"
keyForceNetwork = "force-network-mode"
keyOverrideCopyImage = "override-copy-image" // remove after CopyOp implemented
)
var httpPrefix = regexp.MustCompile("^https?://")
var gitUrlPathWithFragmentSuffix = regexp.MustCompile("\\.git(?:#.+)?$")
func Build(ctx context.Context, c client.Client) (*client.Result, error) {
opts := c.BuildOpts().Opts
caps := c.BuildOpts().LLBCaps
marshalOpts := []llb.ConstraintsOpt{llb.WithCaps(caps)}
defaultBuildPlatform := platforms.DefaultSpec()
if workers := c.BuildOpts().Workers; len(workers) > 0 && len(workers[0].Platforms) > 0 {
defaultBuildPlatform = workers[0].Platforms[0]
}
buildPlatforms := []specs.Platform{defaultBuildPlatform}
targetPlatforms := []*specs.Platform{nil}
if v := opts[keyTargetPlatform]; v != "" {
var err error
targetPlatforms, err = parsePlatforms(v)
if err != nil {
return nil, err
}
}
resolveMode, err := parseResolveMode(opts[keyImageResolveMode])
if err != nil {
return nil, err
}
extraHosts, err := parseExtraHosts(opts[keyGlobalAddHosts])
if err != nil {
return nil, errors.Wrap(err, "failed to parse additional hosts")
}
defaultNetMode, err := parseNetMode(opts[keyForceNetwork])
if err != nil {
return nil, err
}
filename := opts[keyFilename]
if filename == "" {
filename = defaultDockerfileName
}
var ignoreCache []string
if v, ok := opts[keyNoCache]; ok {
if v == "" {
ignoreCache = []string{} // means all stages
} else {
ignoreCache = strings.Split(v, ",")
}
}
name := "load build definition from " + filename
src := llb.Local(LocalNameDockerfile,
llb.FollowPaths([]string{filename}),
llb.SessionID(c.BuildOpts().SessionID),
llb.SharedKeyHint(defaultDockerfileName),
dockerfile2llb.WithInternalName(name),
)
var buildContext *llb.State
isScratchContext := false
if st, ok := detectGitContext(opts[LocalNameContext]); ok {
src = *st
buildContext = &src
} else if httpPrefix.MatchString(opts[LocalNameContext]) {
httpContext := llb.HTTP(opts[LocalNameContext], llb.Filename("context"), dockerfile2llb.WithInternalName("load remote build context"))
def, err := httpContext.Marshal(marshalOpts...)
if err != nil {
return nil, errors.Wrapf(err, "failed to marshal httpcontext")
}
res, err := c.Solve(ctx, client.SolveRequest{
Definition: def.ToPB(),
})
if err != nil {
return nil, errors.Wrapf(err, "failed to resolve httpcontext")
}
ref, err := res.SingleRef()
if err != nil {
return nil, err
}
dt, err := ref.ReadFile(ctx, client.ReadRequest{
Filename: "context",
Range: &client.FileRange{
Length: 1024,
},
})
if err != nil {
return nil, errors.Errorf("failed to read downloaded context")
}
if isArchive(dt) {
copyImage := opts[keyOverrideCopyImage]
if copyImage == "" {
copyImage = dockerfile2llb.DefaultCopyImage
}
unpack := llb.Image(copyImage, dockerfile2llb.WithInternalName("helper image for file operations")).
Run(llb.Shlex("copy --unpack /src/context /out/"), llb.ReadonlyRootFS(), dockerfile2llb.WithInternalName("extracting build context"))
unpack.AddMount("/src", httpContext, llb.Readonly)
src = unpack.AddMount("/out", llb.Scratch())
buildContext = &src
} else {
filename = "context"
src = httpContext
buildContext = &src
isScratchContext = true
}
}
def, err := src.Marshal(marshalOpts...)
if err != nil {
return nil, errors.Wrapf(err, "failed to marshal local source")
}
eg, ctx2 := errgroup.WithContext(ctx)
var dtDockerfile []byte
eg.Go(func() error {
res, err := c.Solve(ctx2, client.SolveRequest{
Definition: def.ToPB(),
})
if err != nil {
return errors.Wrapf(err, "failed to resolve dockerfile")
}
ref, err := res.SingleRef()
if err != nil {
return err
}
dtDockerfile, err = ref.ReadFile(ctx2, client.ReadRequest{
Filename: filename,
})
if err != nil {
return errors.Wrapf(err, "failed to read dockerfile")
}
return nil
})
var excludes []string
if !isScratchContext {
eg.Go(func() error {
dockerignoreState := buildContext
if dockerignoreState == nil {
st := llb.Local(LocalNameContext,
llb.SessionID(c.BuildOpts().SessionID),
llb.FollowPaths([]string{dockerignoreFilename}),
llb.SharedKeyHint(dockerignoreFilename),
dockerfile2llb.WithInternalName("load "+dockerignoreFilename),
)
dockerignoreState = &st
}
def, err := dockerignoreState.Marshal(marshalOpts...)
if err != nil {
return err
}
res, err := c.Solve(ctx2, client.SolveRequest{
Definition: def.ToPB(),
})
if err != nil {
return err
}
ref, err := res.SingleRef()
if err != nil {
return err
}
dtDockerignore, err := ref.ReadFile(ctx2, client.ReadRequest{
Filename: dockerignoreFilename,
})
if err == nil {
excludes, err = dockerignore.ReadAll(bytes.NewBuffer(dtDockerignore))
if err != nil {
return errors.Wrap(err, "failed to parse dockerignore")
}
}
return nil
})
}
if err := eg.Wait(); err != nil {
return nil, err
}
if _, ok := opts["cmdline"]; !ok {
ref, cmdline, ok := dockerfile2llb.DetectSyntax(bytes.NewBuffer(dtDockerfile))
if ok {
return forwardGateway(ctx, c, ref, cmdline)
}
}
exportMap := len(targetPlatforms) > 1
if v := opts[keyMultiPlatform]; v != "" {
b, err := strconv.ParseBool(v)
if err != nil {
return nil, errors.Errorf("invalid boolean value %s", v)
}
if !b && exportMap {
return nil, errors.Errorf("returning multiple target plaforms is not allowed")
}
exportMap = b
}
expPlatforms := &exptypes.Platforms{
Platforms: make([]exptypes.Platform, len(targetPlatforms)),
}
res := client.NewResult()
eg, ctx = errgroup.WithContext(ctx)
for i, tp := range targetPlatforms {
func(i int, tp *specs.Platform) {
eg.Go(func() error {
st, img, err := dockerfile2llb.Dockerfile2LLB(ctx, dtDockerfile, dockerfile2llb.ConvertOpt{
Target: opts[keyTarget],
MetaResolver: c,
BuildArgs: filter(opts, buildArgPrefix),
Labels: filter(opts, labelPrefix),
SessionID: c.BuildOpts().SessionID,
BuildContext: buildContext,
Excludes: excludes,
IgnoreCache: ignoreCache,
TargetPlatform: tp,
BuildPlatforms: buildPlatforms,
ImageResolveMode: resolveMode,
PrefixPlatform: exportMap,
ExtraHosts: extraHosts,
ForceNetMode: defaultNetMode,
OverrideCopyImage: opts[keyOverrideCopyImage],
LLBCaps: &caps,
})
if err != nil {
return errors.Wrapf(err, "failed to create LLB definition")
}
def, err := st.Marshal()
if err != nil {
return errors.Wrapf(err, "failed to marshal LLB definition")
}
config, err := json.Marshal(img)
if err != nil {
return errors.Wrapf(err, "failed to marshal image config")
}
var cacheFrom []string
if cacheFromStr := opts[keyCacheFrom]; cacheFromStr != "" {
cacheFrom = strings.Split(cacheFromStr, ",")
}
r, err := c.Solve(ctx, client.SolveRequest{
Definition: def.ToPB(),
ImportCacheRefs: cacheFrom,
})
if err != nil {
return err
}
ref, err := r.SingleRef()
if err != nil {
return err
}
if !exportMap {
res.AddMeta(exptypes.ExporterImageConfigKey, config)
res.SetRef(ref)
} else {
p := platforms.DefaultSpec()
if tp != nil {
p = *tp
}
k := platforms.Format(p)
res.AddMeta(fmt.Sprintf("%s/%s", exptypes.ExporterImageConfigKey, k), config)
res.AddRef(k, ref)
expPlatforms.Platforms[i] = exptypes.Platform{
ID: k,
Platform: p,
}
}
return nil
})
}(i, tp)
}
if err := eg.Wait(); err != nil {
return nil, err
}
if exportMap {
dt, err := json.Marshal(expPlatforms)
if err != nil {
return nil, err
}
res.AddMeta(exptypes.ExporterPlatformsKey, dt)
}
return res, nil
}
func forwardGateway(ctx context.Context, c client.Client, ref string, cmdline string) (*client.Result, error) {
opts := c.BuildOpts().Opts
if opts == nil {
opts = map[string]string{}
}
opts["cmdline"] = cmdline
opts["source"] = ref
return c.Solve(ctx, client.SolveRequest{
Frontend: "gateway.v0",
FrontendOpt: opts,
})
}
func filter(opt map[string]string, key string) map[string]string {
m := map[string]string{}
for k, v := range opt {
if strings.HasPrefix(k, key) {
m[strings.TrimPrefix(k, key)] = v
}
}
return m
}
func detectGitContext(ref string) (*llb.State, bool) {
found := false
if httpPrefix.MatchString(ref) && gitUrlPathWithFragmentSuffix.MatchString(ref) {
found = true
}
for _, prefix := range []string{"git://", "github.com/", "git@"} {
if strings.HasPrefix(ref, prefix) {
found = true
break
}
}
if !found {
return nil, false
}
parts := strings.SplitN(ref, "#", 2)
branch := ""
if len(parts) > 1 {
branch = parts[1]
}
st := llb.Git(parts[0], branch, dockerfile2llb.WithInternalName("load git source "+ref))
return &st, true
}
func isArchive(header []byte) bool {
for _, m := range [][]byte{
{0x42, 0x5A, 0x68}, // bzip2
{0x1F, 0x8B, 0x08}, // gzip
{0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00}, // xz
} {
if len(header) < len(m) {
continue
}
if bytes.Equal(m, header[:len(m)]) {
return true
}
}
r := tar.NewReader(bytes.NewBuffer(header))
_, err := r.Next()
return err == nil
}
func parsePlatforms(v string) ([]*specs.Platform, error) {
var pp []*specs.Platform
for _, v := range strings.Split(v, ",") {
p, err := platforms.Parse(v)
if err != nil {
return nil, errors.Wrapf(err, "failed to parse target platform %s", v)
}
p = platforms.Normalize(p)
pp = append(pp, &p)
}
return pp, nil
}
func parseResolveMode(v string) (llb.ResolveMode, error) {
switch v {
case pb.AttrImageResolveModeDefault, "":
return llb.ResolveModeDefault, nil
case pb.AttrImageResolveModeForcePull:
return llb.ResolveModeForcePull, nil
case pb.AttrImageResolveModePreferLocal:
return llb.ResolveModePreferLocal, nil
default:
return 0, errors.Errorf("invalid image-resolve-mode: %s", v)
}
}
func parseExtraHosts(v string) ([]llb.HostIP, error) {
if v == "" {
return nil, nil
}
out := make([]llb.HostIP, 0)
csvReader := csv.NewReader(strings.NewReader(v))
fields, err := csvReader.Read()
if err != nil {
return nil, err
}
for _, field := range fields {
parts := strings.SplitN(field, "=", 2)
if len(parts) != 2 {
return nil, errors.Errorf("invalid key-value pair %s", field)
}
key := strings.ToLower(parts[0])
val := strings.ToLower(parts[1])
ip := net.ParseIP(val)
if ip == nil {
return nil, errors.Errorf("failed to parse IP %s", val)
}
out = append(out, llb.HostIP{Host: key, IP: ip})
}
return out, nil
}
func parseNetMode(v string) (pb.NetMode, error) {
if v == "" {
return llb.NetModeSandbox, nil
}
switch v {
case "none":
return llb.NetModeNone, nil
case "host":
return llb.NetModeHost, nil
case "sandbox":
return llb.NetModeSandbox, nil
default:
return 0, errors.Errorf("invalid netmode %s", v)
}
}