Improve shim debug logging

- Add log statements in service entry points.
- Propagate `-debug` flag from shim invokation to the service
- Load options when shim process is invoked to ensure runsc commands
  use the correct set of options, e.g. --debug --debug-logs=...
- Add debug options to the shim configuration directly, so it doesn't
  rely on containerd configuration (and restart) to enable shim debug.
- Save shim logs to dedicated file, so it's easier to read logs. They
  would be mixed with containerd logs and hard to distinguish
  otherwise.

PiperOrigin-RevId: 342179868

4 files changed, 3 insertions, 22 deletions

diff --git a/pkg/shim/v1/proc/init.go b/pkg/shim/v1/proc/init.go
index dab3123d6..9fd7d978c 100644
--- a/pkg/shim/v1/proc/init.go
+++ b/pkg/shim/v1/proc/init.go
@@ -397,7 +397,7 @@ func (p *Init) Exec(ctx context.Context, path string, r *ExecConfig) (process.Pr
 }
 
 // exec returns a new exec'd process.
-func (p *Init) exec(ctx context.Context, path string, r *ExecConfig) (process.Process, error) {
+func (p *Init) exec(path string, r *ExecConfig) (process.Process, error) {
 	// process exec request
 	var spec specs.Process
 	if err := json.Unmarshal(r.Spec.Value, &spec); err != nil {
diff --git a/pkg/shim/v1/proc/init_state.go b/pkg/shim/v1/proc/init_state.go
index 9233ecc85..0065fc385 100644
--- a/pkg/shim/v1/proc/init_state.go
+++ b/pkg/shim/v1/proc/init_state.go
@@ -95,7 +95,7 @@ func (s *createdState) SetExited(status int) {
 }
 
 func (s *createdState) Exec(ctx context.Context, path string, r *ExecConfig) (process.Process, error) {
-	return s.p.exec(ctx, path, r)
+	return s.p.exec(path, r)
 }
 
 type runningState struct {
@@ -137,7 +137,7 @@ func (s *runningState) SetExited(status int) {
 }
 
 func (s *runningState) Exec(ctx context.Context, path string, r *ExecConfig) (process.Process, error) {
-	return s.p.exec(ctx, path, r)
+	return s.p.exec(path, r)
 }
 
 type stoppedState struct {
diff --git a/pkg/shim/v1/proc/types.go b/pkg/shim/v1/proc/types.go
index 2b0df4663..fc182cf5e 100644
--- a/pkg/shim/v1/proc/types.go
+++ b/pkg/shim/v1/proc/types.go
@@ -40,7 +40,6 @@ type CreateConfig struct {
 	Stdin    string
 	Stdout   string
 	Stderr   string
-	Options  *types.Any
 }
 
 // ExecConfig holds exec creation configuration.
diff --git a/pkg/shim/v1/proc/utils.go b/pkg/shim/v1/proc/utils.go
index 716de2f59..7c2c409af 100644
--- a/pkg/shim/v1/proc/utils.go
+++ b/pkg/shim/v1/proc/utils.go
@@ -67,24 +67,6 @@ func getLastRuntimeError(r *runsc.Runsc) (string, error) {
 	return errMsg, nil
 }
 
-func copyFile(to, from string) error {
-	ff, err := os.Open(from)
-	if err != nil {
-		return err
-	}
-	defer ff.Close()
-	tt, err := os.Create(to)
-	if err != nil {
-		return err
-	}
-	defer tt.Close()
-
-	p := bufPool.Get().(*[]byte)
-	defer bufPool.Put(p)
-	_, err = io.CopyBuffer(tt, ff, *p)
-	return err
-}
-
 func hasNoIO(r *CreateConfig) bool {
 	return r.Stdin == "" && r.Stdout == "" && r.Stderr == ""
 }