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session.go
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session.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package buildkit
import (
"context"
"encoding/json"
"fmt"
"io"
"os"
"strings"
"github.com/docker/cli/cli/config"
"github.com/moby/buildkit/client/llb"
"github.com/moby/buildkit/session"
"github.com/moby/buildkit/session/auth"
"github.com/moby/buildkit/session/auth/authprovider"
"github.com/moby/buildkit/session/secrets/secretsprovider"
"github.com/moby/buildkit/session/sshforward/sshprovider"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"namespacelabs.dev/foundation/framework/rpcerrors"
"namespacelabs.dev/foundation/framework/rpcerrors/multierr"
"namespacelabs.dev/foundation/internal/artifacts/oci"
"namespacelabs.dev/foundation/internal/console"
"namespacelabs.dev/foundation/internal/fnerrors"
"namespacelabs.dev/foundation/internal/parsing/devhost"
"namespacelabs.dev/foundation/internal/secrets"
"namespacelabs.dev/foundation/internal/workspace/dirs"
"namespacelabs.dev/foundation/schema"
)
type FrontendRequest struct {
Def *llb.Definition
OriginalState *llb.State
Frontend string
FrontendOpt map[string]string
FrontendInputs map[string]llb.State
Secrets []*schema.PackageRef
}
func MakeLocalExcludes(src LocalContents) []string {
excludePatterns := []string{}
excludePatterns = append(excludePatterns, dirs.BasePatternsToExclude...)
excludePatterns = append(excludePatterns, devhost.HostOnlyFiles()...)
excludePatterns = append(excludePatterns, src.ExcludePatterns...)
return excludePatterns
}
func MakeLocalState(src LocalContents) llb.State {
return llb.Local(src.Abs(),
llb.WithCustomName(fmt.Sprintf("Workspace %s (from %s)", src.Path, src.Module.ModuleName())),
llb.SharedKeyHint(src.Abs()),
llb.LocalUniqueID(src.Abs()),
llb.ExcludePatterns(MakeLocalExcludes(src)))
}
func prepareSession(ctx context.Context, keychain oci.Keychain, src secrets.GroundedSecrets, secrets []*schema.PackageRef) ([]session.Attachable, error) {
var fs []secretsprovider.Source
for _, def := range strings.Split(BuildkitSecrets, ";") {
if def == "" {
continue
}
parts := strings.Split(def, ":")
if len(parts) != 3 {
return nil, fnerrors.BadInputError("bad secret definition, expected {name}:env|file:{value}")
}
src := secretsprovider.Source{
ID: parts[0],
}
switch parts[1] {
case "env":
src.Env = parts[2]
case "file":
src.FilePath = parts[2]
default:
return nil, fnerrors.BadInputError("expected env or file, got %q", parts[1])
}
fs = append(fs, src)
}
store, err := secretsprovider.NewStore(fs)
if err != nil {
return nil, err
}
secretValues := map[string][]byte{}
if len(secrets) > 0 {
if src == nil {
return nil, fnerrors.InternalError("secrets specified, but secret source missing")
}
var errs []error
for _, sec := range secrets {
result, err := src.Get(ctx, sec)
if err != nil {
errs = append(errs, err)
continue
}
if result.Value == nil {
return nil, fnerrors.New("can't use secret %q, no value available (it's generated)", sec.Canonical())
}
secretValues[sec.Canonical()] = result.Value
}
if err := multierr.New(errs...); err != nil {
return nil, err
}
}
attachables := []session.Attachable{
secretsprovider.NewSecretProvider(secretSource{store, secretValues}),
}
if ForwardKeychain {
if keychain != nil {
attachables = append(attachables, keychainWrapper{ctx: ctx, errorLogger: console.Output(ctx, "buildkit-auth"), keychain: keychain})
}
} else {
dockerConfig := config.LoadDefaultConfigFile(console.Stderr(ctx))
attachables = append(attachables, authprovider.NewDockerAuthProvider(dockerConfig))
}
// XXX make this configurable; eg at the devhost side.
if os.Getenv("SSH_AUTH_SOCK") != "" {
ssh, err := sshprovider.NewSSHAgentProvider([]sshprovider.AgentConfig{{ID: SSHAgentProviderID}})
if err != nil {
return nil, err
}
attachables = append(attachables, ssh)
}
return attachables, nil
}
type keychainWrapper struct {
ctx context.Context // Solve's parent context.
errorLogger io.Writer
keychain oci.Keychain
}
func (kw keychainWrapper) Register(server *grpc.Server) {
auth.RegisterAuthServer(server, kw)
}
func (kw keychainWrapper) Credentials(ctx context.Context, req *auth.CredentialsRequest) (*auth.CredentialsResponse, error) {
response, err := kw.credentials(ctx, req.Host)
if err == nil {
fmt.Fprintf(console.Debug(kw.ctx), "[buildkit] AuthServer.Credentials %q --> %q\n", req.Host, response.Username)
} else {
fmt.Fprintf(console.Debug(kw.ctx), "[buildkit] AuthServer.Credentials %q: failed: %v\n", req.Host, err)
}
return response, err
}
func (kw keychainWrapper) credentials(ctx context.Context, host string) (*auth.CredentialsResponse, error) {
// The parent context, not the incoming context is used, as the parent
// context has an ActionSink attached (etc) while the incoming context is
// managed by buildkit.
authn, err := kw.keychain.Resolve(kw.ctx, resourceWrapper{host})
if err != nil {
return nil, err
}
if authn == nil {
return &auth.CredentialsResponse{}, nil
}
authz, err := authn.Authorization()
if err != nil {
return nil, err
}
if authz.IdentityToken != "" || authz.RegistryToken != "" {
fmt.Fprintf(kw.errorLogger, "%s: authentication type mismatch, got token expected username/secret", host)
return nil, rpcerrors.Errorf(codes.InvalidArgument, "expected username/secret got token")
}
return &auth.CredentialsResponse{Username: authz.Username, Secret: authz.Password}, nil
}
func (kw keychainWrapper) FetchToken(ctx context.Context, req *auth.FetchTokenRequest) (*auth.FetchTokenResponse, error) {
fmt.Fprintf(kw.errorLogger, "AuthServer.FetchToken %s\n", asJson(req))
return nil, rpcerrors.Errorf(codes.Unimplemented, "unimplemented")
}
func (kw keychainWrapper) GetTokenAuthority(ctx context.Context, req *auth.GetTokenAuthorityRequest) (*auth.GetTokenAuthorityResponse, error) {
fmt.Fprintf(kw.errorLogger, "AuthServer.GetTokenAuthority %s\n", asJson(req))
return nil, rpcerrors.Errorf(codes.Unimplemented, "unimplemented")
}
func (kw keychainWrapper) VerifyTokenAuthority(ctx context.Context, req *auth.VerifyTokenAuthorityRequest) (*auth.VerifyTokenAuthorityResponse, error) {
fmt.Fprintf(kw.errorLogger, "AuthServer.VerifyTokenAuthority %s\n", asJson(req))
return nil, rpcerrors.Errorf(codes.Unimplemented, "unimplemented")
}
type resourceWrapper struct {
host string
}
func (rw resourceWrapper) String() string { return rw.host }
func (rw resourceWrapper) RegistryStr() string { return rw.host }
func asJson(msg any) string {
str, _ := json.Marshal(msg)
return string(str)
}