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package build
import (
"context"
_ "crypto/sha256" // ensure digests can be computed
"encoding/json"
"io"
"sync"
"sync/atomic"
controllerapi "github.com/docker/buildx/controller/pb"
"github.com/moby/buildkit/client"
"github.com/moby/buildkit/exporter/containerimage/exptypes"
gateway "github.com/moby/buildkit/frontend/gateway/client"
"github.com/moby/buildkit/solver/errdefs"
"github.com/moby/buildkit/solver/pb"
specs "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
func NewResultContext(c *client.Client, solveOpt client.SolveOpt, res *gateway.Result) (*ResultContext, error) {
ctx := context.Background()
def, err := getDefinition(ctx, res)
if err != nil {
return nil, err
}
return getResultAt(ctx, c, solveOpt, def, nil)
}
func getDefinition(ctx context.Context, res *gateway.Result) (*pb.Definition, error) {
ref, err := res.SingleRef()
if err != nil {
return nil, err
}
st, err := ref.ToState()
if err != nil {
return nil, err
}
def, err := st.Marshal(ctx)
if err != nil {
return nil, err
}
return def.ToPB(), nil
}
func getResultAt(ctx context.Context, c *client.Client, solveOpt client.SolveOpt, target *pb.Definition, statusChan chan *client.SolveStatus) (*ResultContext, error) {
ctx, cancel := context.WithCancel(ctx)
defer cancel()
// forward SolveStatus
done := new(atomic.Bool)
defer done.Store(true)
ch := make(chan *client.SolveStatus)
go func() {
for {
s := <-ch
if s == nil {
return
}
if done.Load() {
// Do not forward if the function returned because statusChan is possibly closed
continue
}
select {
case statusChan <- s:
case <-ctx.Done():
}
}
}()
// get result
resultCtxCh := make(chan *ResultContext)
errCh := make(chan error)
go func() {
_, err := c.Build(context.Background(), solveOpt, "buildx", func(ctx context.Context, c gateway.Client) (*gateway.Result, error) {
ctx, cancel := context.WithCancel(ctx)
defer cancel()
resultCtx := ResultContext{}
res2, err := c.Solve(ctx, gateway.SolveRequest{
Evaluate: true,
Definition: target,
})
if err != nil {
var se *errdefs.SolveError
if errors.As(err, &se) {
resultCtx.solveErr = se
} else {
return nil, err
}
}
// Record the client and ctx as well so that containers can be created from the SolveError.
resultCtx.res = res2
resultCtx.gwClient = c
resultCtx.gwCtx = ctx
resultCtx.gwDone = cancel
select {
case resultCtxCh <- &resultCtx:
case <-ctx.Done():
return nil, ctx.Err()
}
<-ctx.Done()
return nil, nil
}, ch)
if err != nil {
errCh <- err
}
}()
select {
case resultCtx := <-resultCtxCh:
return resultCtx, nil
case err := <-errCh:
return nil, err
case <-ctx.Done():
return nil, ctx.Err()
}
}
// ResultContext is a build result with the client that built it.
type ResultContext struct {
res *gateway.Result
solveErr *errdefs.SolveError
gwClient gateway.Client
gwCtx context.Context
gwDone func()
gwDoneOnce sync.Once
cleanups []func()
cleanupsMu sync.Mutex
}
func (r *ResultContext) Done() {
r.gwDoneOnce.Do(func() {
r.cleanupsMu.Lock()
cleanups := r.cleanups
r.cleanups = nil
r.cleanupsMu.Unlock()
for _, f := range cleanups {
f()
}
r.gwDone()
})
}
func (r *ResultContext) registerCleanup(f func()) {
r.cleanupsMu.Lock()
r.cleanups = append(r.cleanups, f)
r.cleanupsMu.Unlock()
}
func (r *ResultContext) build(buildFunc gateway.BuildFunc) (err error) {
_, err = buildFunc(r.gwCtx, r.gwClient)
return err
}
func (r *ResultContext) getContainerConfig(ctx context.Context, c gateway.Client, cfg *controllerapi.InvokeConfig) (containerCfg gateway.NewContainerRequest, _ error) {
if r.res != nil && r.solveErr == nil {
logrus.Debugf("creating container from successful build")
ccfg, err := containerConfigFromResult(ctx, r.res, c, *cfg)
if err != nil {
return containerCfg, err
}
containerCfg = *ccfg
} else {
logrus.Debugf("creating container from failed build %+v", cfg)
ccfg, err := containerConfigFromError(r.solveErr, *cfg)
if err != nil {
return containerCfg, errors.Wrapf(err, "no result nor error is available")
}
containerCfg = *ccfg
}
return containerCfg, nil
}
func (r *ResultContext) getProcessConfig(cfg *controllerapi.InvokeConfig, stdin io.ReadCloser, stdout io.WriteCloser, stderr io.WriteCloser) (_ gateway.StartRequest, err error) {
processCfg := newStartRequest(stdin, stdout, stderr)
if r.res != nil && r.solveErr == nil {
logrus.Debugf("creating container from successful build")
if err := populateProcessConfigFromResult(&processCfg, r.res, *cfg); err != nil {
return processCfg, err
}
} else {
logrus.Debugf("creating container from failed build %+v", cfg)
if err := populateProcessConfigFromError(&processCfg, r.solveErr, *cfg); err != nil {
return processCfg, err
}
}
return processCfg, nil
}
func containerConfigFromResult(ctx context.Context, res *gateway.Result, c gateway.Client, cfg controllerapi.InvokeConfig) (*gateway.NewContainerRequest, error) {
if res.Ref == nil {
return nil, errors.Errorf("no reference is registered")
}
if cfg.Initial {
return nil, errors.Errorf("starting from the container from the initial state of the step is supported only on the failed steps")
}
st, err := res.Ref.ToState()
if err != nil {
return nil, err
}
def, err := st.Marshal(ctx)
if err != nil {
return nil, err
}
imgRef, err := c.Solve(ctx, gateway.SolveRequest{
Definition: def.ToPB(),
})
if err != nil {
return nil, err
}
return &gateway.NewContainerRequest{
Mounts: []gateway.Mount{
{
Dest: "/",
MountType: pb.MountType_BIND,
Ref: imgRef.Ref,
},
},
}, nil
}
func populateProcessConfigFromResult(req *gateway.StartRequest, res *gateway.Result, cfg controllerapi.InvokeConfig) error {
imgData := res.Metadata[exptypes.ExporterImageConfigKey]
var img *specs.Image
if len(imgData) > 0 {
img = &specs.Image{}
if err := json.Unmarshal(imgData, img); err != nil {
return err
}
}
user := ""
if !cfg.NoUser {
user = cfg.User
} else if img != nil {
user = img.Config.User
}
cwd := ""
if !cfg.NoCwd {
cwd = cfg.Cwd
} else if img != nil {
cwd = img.Config.WorkingDir
}
env := []string{}
if img != nil {
env = append(env, img.Config.Env...)
}
env = append(env, cfg.Env...)
args := []string{}
if cfg.Entrypoint != nil {
args = append(args, cfg.Entrypoint...)
} else if img != nil {
args = append(args, img.Config.Entrypoint...)
}
if cfg.Cmd != nil {
args = append(args, cfg.Cmd...)
} else if img != nil {
args = append(args, img.Config.Cmd...)
}
req.Args = args
req.Env = env
req.User = user
req.Cwd = cwd
req.Tty = cfg.Tty
return nil
}
func containerConfigFromError(solveErr *errdefs.SolveError, cfg controllerapi.InvokeConfig) (*gateway.NewContainerRequest, error) {
exec, err := execOpFromError(solveErr)
if err != nil {
return nil, err
}
var mounts []gateway.Mount
for i, mnt := range exec.Mounts {
rid := solveErr.Solve.MountIDs[i]
if cfg.Initial {
rid = solveErr.Solve.InputIDs[i]
}
mounts = append(mounts, gateway.Mount{
Selector: mnt.Selector,
Dest: mnt.Dest,
ResultID: rid,
Readonly: mnt.Readonly,
MountType: mnt.MountType,
CacheOpt: mnt.CacheOpt,
SecretOpt: mnt.SecretOpt,
SSHOpt: mnt.SSHOpt,
})
}
return &gateway.NewContainerRequest{
Mounts: mounts,
NetMode: exec.Network,
}, nil
}
func populateProcessConfigFromError(req *gateway.StartRequest, solveErr *errdefs.SolveError, cfg controllerapi.InvokeConfig) error {
exec, err := execOpFromError(solveErr)
if err != nil {
return err
}
meta := exec.Meta
user := ""
if !cfg.NoUser {
user = cfg.User
} else {
user = meta.User
}
cwd := ""
if !cfg.NoCwd {
cwd = cfg.Cwd
} else {
cwd = meta.Cwd
}
env := append(meta.Env, cfg.Env...)
args := []string{}
if cfg.Entrypoint != nil {
args = append(args, cfg.Entrypoint...)
}
if cfg.Cmd != nil {
args = append(args, cfg.Cmd...)
}
if len(args) == 0 {
args = meta.Args
}
req.Args = args
req.Env = env
req.User = user
req.Cwd = cwd
req.Tty = cfg.Tty
return nil
}
func execOpFromError(solveErr *errdefs.SolveError) (*pb.ExecOp, error) {
if solveErr == nil {
return nil, errors.Errorf("no error is available")
}
switch op := solveErr.Solve.Op.GetOp().(type) {
case *pb.Op_Exec:
return op.Exec, nil
default:
return nil, errors.Errorf("invoke: unsupported error type")
}
// TODO: support other ops
}
func newStartRequest(stdin io.ReadCloser, stdout io.WriteCloser, stderr io.WriteCloser) gateway.StartRequest {
return gateway.StartRequest{
Stdin: stdin,
Stdout: stdout,
Stderr: stderr,
}
}