linux: Return grpc error description only

This avoid having "rpc error: code = Unknown" in the final output.

Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>

linux/task.go

@@ -5,11 +5,14 @@ package linux
 import (
 	"context"
 
+	"google.golang.org/grpc"
+
 	"github.com/containerd/containerd/api/services/shim"
 	"github.com/containerd/containerd/api/types/task"
 	"github.com/containerd/containerd/plugin"
 	protobuf "github.com/gogo/protobuf/types"
 	specs "github.com/opencontainers/runtime-spec/specs-go"
+	"github.com/pkg/errors"
 )
 
 type Task struct {
@@ -40,13 +43,16 @@ func (c *Task) Info() plugin.TaskInfo {
 
 func (c *Task) Start(ctx context.Context) error {
 	_, err := c.shim.Start(ctx, &shim.StartRequest{})
+	if err != nil {
+		err = errors.New(grpc.ErrorDesc(err))
+	}
 	return err
 }
 
 func (c *Task) State(ctx context.Context) (plugin.State, error) {
 	response, err := c.shim.State(ctx, &shim.StateRequest{})
 	if err != nil {
-		return plugin.State{}, err
+		return plugin.State{}, errors.New(grpc.ErrorDesc(err))
 	}
 	var status plugin.Status
 	switch response.Status {
@@ -72,11 +78,17 @@ func (c *Task) State(ctx context.Context) (plugin.State, error) {
 
 func (c *Task) Pause(ctx context.Context) error {
 	_, err := c.shim.Pause(ctx, &shim.PauseRequest{})
+	if err != nil {
+		err = errors.New(grpc.ErrorDesc(err))
+	}
 	return err
 }
 
 func (c *Task) Resume(ctx context.Context) error {
 	_, err := c.shim.Resume(ctx, &shim.ResumeRequest{})
+	if err != nil {
+		err = errors.New(grpc.ErrorDesc(err))
+	}
 	return err
 }
 
@@ -86,6 +98,9 @@ func (c *Task) Kill(ctx context.Context, signal uint32, pid uint32, all bool) er
 		Pid:    pid,
 		All:    all,
 	})
+	if err != nil {
+		err = errors.New(grpc.ErrorDesc(err))
+	}
 	return err
 }
 
@@ -102,7 +117,7 @@ func (c *Task) Exec(ctx context.Context, opts plugin.ExecOpts) (plugin.Process,
 	}
 	resp, err := c.shim.Exec(ctx, request)
 	if err != nil {
-		return nil, err
+		return nil, errors.New(grpc.ErrorDesc(err))
 
 	}
 	return &Process{
@@ -115,9 +130,8 @@ func (c *Task) Processes(ctx context.Context) ([]uint32, error) {
 	resp, err := c.shim.Processes(ctx, &shim.ProcessesRequest{
 		ID: c.containerID,
 	})
-
 	if err != nil {
-		return nil, err
+		return nil, errors.New(grpc.ErrorDesc(err))
 	}
 
 	pids := make([]uint32, 0, len(resp.Processes))
@@ -135,6 +149,9 @@ func (c *Task) Pty(ctx context.Context, pid uint32, size plugin.ConsoleSize) err
 		Width:  size.Width,
 		Height: size.Height,
 	})
+	if err != nil {
+		err = errors.New(grpc.ErrorDesc(err))
+	}
 	return err
 }
 
@@ -142,6 +159,9 @@ func (c *Task) CloseStdin(ctx context.Context, pid uint32) error {
 	_, err := c.shim.CloseStdin(ctx, &shim.CloseStdinRequest{
 		Pid: pid,
 	})
+	if err != nil {
+		err = errors.New(grpc.ErrorDesc(err))
+	}
 	return err
 }
 
@@ -155,6 +175,9 @@ func (c *Task) Checkpoint(ctx context.Context, opts plugin.CheckpointOpts) error
 		EmptyNamespaces:  opts.EmptyNamespaces,
 		CheckpointPath:   opts.Path,
 	})
+	if err != nil {
+		err = errors.New(grpc.ErrorDesc(err))
+	}
 	return err
 }
 
@@ -163,7 +186,7 @@ func (c *Task) DeleteProcess(ctx context.Context, pid uint32) (*plugin.Exit, err
 		Pid: pid,
 	})
 	if err != nil {
-		return nil, err
+		return nil, errors.New(grpc.ErrorDesc(err))
 	}
 	return &plugin.Exit{
 		Status:    r.ExitStatus,
@@ -181,6 +204,9 @@ func (p *Process) Kill(ctx context.Context, signal uint32, _ bool) error {
 		Signal: signal,
 		Pid:    uint32(p.pid),
 	})
+	if err != nil {
+		err = errors.New(grpc.ErrorDesc(err))
+	}
 	return err
 }