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|
package dockerui
import (
"archive/tar"
"bytes"
"context"
"path/filepath"
"regexp"
"strconv"
"github.com/moby/buildkit/client/llb"
"github.com/moby/buildkit/frontend/gateway/client"
gwpb "github.com/moby/buildkit/frontend/gateway/pb"
"github.com/moby/buildkit/util/gitutil"
"github.com/pkg/errors"
)
const (
DefaultLocalNameContext = "context"
DefaultLocalNameDockerfile = "dockerfile"
DefaultDockerfileName = "Dockerfile"
DefaultDockerignoreName = ".dockerignore"
EmptyImageName = "scratch"
)
const (
keyFilename = "filename"
keyContextSubDir = "contextsubdir"
keyNameContext = "contextkey"
keyNameDockerfile = "dockerfilekey"
)
var httpPrefix = regexp.MustCompile(`^https?://`)
type buildContext struct {
context *llb.State // set if not local
dockerfile *llb.State // override remoteContext if set
contextLocalName string
dockerfileLocalName string
filename string
forceLocalDockerfile bool
}
func (bc *Client) marshalOpts() []llb.ConstraintsOpt {
return []llb.ConstraintsOpt{llb.WithCaps(bc.bopts.Caps)}
}
func (bc *Client) initContext(ctx context.Context) (*buildContext, error) {
opts := bc.bopts.Opts
gwcaps := bc.bopts.Caps
localNameContext := DefaultLocalNameContext
if v, ok := opts[keyNameContext]; ok {
localNameContext = v
}
bctx := &buildContext{
contextLocalName: DefaultLocalNameContext,
dockerfileLocalName: DefaultLocalNameDockerfile,
filename: DefaultDockerfileName,
}
if v, ok := opts[keyFilename]; ok {
bctx.filename = v
}
if v, ok := opts[keyNameDockerfile]; ok {
bctx.forceLocalDockerfile = true
bctx.dockerfileLocalName = v
}
keepGit := false
if v, err := strconv.ParseBool(opts[keyContextKeepGitDirArg]); err == nil {
keepGit = v
}
if st, ok := DetectGitContext(opts[localNameContext], keepGit); ok {
bctx.context = st
bctx.dockerfile = st
} else if st, filename, ok := DetectHTTPContext(opts[localNameContext]); ok {
def, err := st.Marshal(ctx, bc.marshalOpts()...)
if err != nil {
return nil, errors.Wrapf(err, "failed to marshal httpcontext")
}
res, err := bc.client.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: filename,
Range: &client.FileRange{
Length: 1024,
},
})
if err != nil {
return nil, errors.Wrapf(err, "failed to read downloaded context")
}
if isArchive(dt) {
bc := llb.Scratch().File(llb.Copy(*st, filepath.Join("/", filename), "/", &llb.CopyInfo{
AttemptUnpack: true,
}))
bctx.context = &bc
} else {
bctx.filename = filename
bctx.context = st
}
bctx.dockerfile = bctx.context
} else if (&gwcaps).Supports(gwpb.CapFrontendInputs) == nil {
inputs, err := bc.client.Inputs(ctx)
if err != nil {
return nil, errors.Wrapf(err, "failed to get frontend inputs")
}
if !bctx.forceLocalDockerfile {
inputDockerfile, ok := inputs[bctx.dockerfileLocalName]
if ok {
bctx.dockerfile = &inputDockerfile
}
}
inputCtx, ok := inputs[DefaultLocalNameContext]
if ok {
bctx.context = &inputCtx
}
}
if bctx.context != nil {
if sub, ok := opts[keyContextSubDir]; ok {
bctx.context = scopeToSubDir(bctx.context, sub)
}
}
return bctx, nil
}
func DetectGitContext(ref string, keepGit bool) (*llb.State, bool) {
g, err := gitutil.ParseGitRef(ref)
if err != nil {
return nil, false
}
commit := g.Commit
if g.SubDir != "" {
commit += ":" + g.SubDir
}
gitOpts := []llb.GitOption{WithInternalName("load git source " + ref)}
if keepGit {
gitOpts = append(gitOpts, llb.KeepGitDir())
}
st := llb.Git(g.Remote, commit, gitOpts...)
return &st, true
}
func DetectHTTPContext(ref string) (*llb.State, string, bool) {
filename := "context"
if httpPrefix.MatchString(ref) {
st := llb.HTTP(ref, llb.Filename(filename), WithInternalName("load remote build context"))
return &st, filename, true
}
return nil, "", false
}
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 scopeToSubDir(c *llb.State, dir string) *llb.State {
bc := llb.Scratch().File(llb.Copy(*c, dir, "/", &llb.CopyInfo{
CopyDirContentsOnly: true,
}))
return &bc
}
|
