Make error messages a bit more user friendly.

Updated error messages so that it doesn't print full Go struct representations
when running a new container in a sandbox. For example, this occurs frequently
when commands are not found when doing a 'kubectl exec'.

PiperOrigin-RevId: 219729141
Change-Id: Ic3a7bc84cd7b2167f495d48a1da241d621d3ca09

2 files changed, 3 insertions, 3 deletions

diff --git a/runsc/boot/loader.go b/runsc/boot/loader.go
index abb347835..380fa3fbf 100644
--- a/runsc/boot/loader.go
+++ b/runsc/boot/loader.go
@@ -618,7 +618,7 @@ func (l *Loader) executeAsync(args *control.ExecArgs) (kernel.ThreadID, error) {
 	ep, ok := l.processes[rootKey]
 	l.mu.Unlock()
 	if !ok {
-		return 0, fmt.Errorf("cannot exec in container %q: no such container", args.ContainerID)
+		return 0, fmt.Errorf("no such container: %q", args.ContainerID)
 	}
 	ep.tg.Leader().WithMuLocked(func(t *kernel.Task) {
 		args.Root = t.FSContext().RootDirectory()
@@ -631,7 +631,7 @@ func (l *Loader) executeAsync(args *control.ExecArgs) (kernel.ThreadID, error) {
 	proc := control.Proc{Kernel: l.k}
 	tg, tgid, ttyFile, err := control.ExecAsync(&proc, args)
 	if err != nil {
-		return 0, fmt.Errorf("error executing: %+v: %v", args, err)
+		return 0, err
 	}
 
 	// Insert the process into processes so that we can wait on it
diff --git a/runsc/sandbox/sandbox.go b/runsc/sandbox/sandbox.go
index df235c5e9..9421bd63e 100644
--- a/runsc/sandbox/sandbox.go
+++ b/runsc/sandbox/sandbox.go
@@ -229,7 +229,7 @@ func (s *Sandbox) Execute(args *control.ExecArgs) (int32, error) {
 	// Send a message to the sandbox control server to start the container.
 	var pid int32
 	if err := conn.Call(boot.ContainerExecuteAsync, args, &pid); err != nil {
-		return 0, fmt.Errorf("error executing in sandbox: %v", err)
+		return 0, fmt.Errorf("error executing command %q in sandbox: %v", args, err)
 	}
 	return pid, nil
 }