feat(idlesleep): support container dependencies, including custom and docker depends_on, code refactor

internal/idlewatcher/errors.go

@@ -0,0 +1,65 @@
+package idlewatcher
+
+import (
+	"context"
+	"errors"
+	"fmt"
+)
+
+type watcherError struct {
+	watcher *Watcher
+	err     error
+}
+
+func (e *watcherError) Unwrap() error {
+	return e.err
+}
+
+func (e *watcherError) Error() string {
+	return fmt.Sprintf("watcher %q error: %s", e.watcher.cfg.ContainerName(), e.err.Error())
+}
+
+func (w *Watcher) newWatcherError(err error) error {
+	if errors.Is(err, causeReload) {
+		return nil
+	}
+	if wErr, ok := err.(*watcherError); ok { //nolint:errorlint
+		return wErr
+	}
+	return &watcherError{watcher: w, err: convertError(err)}
+}
+
+type depError struct {
+	action string
+	dep    *dependency
+	err    error
+}
+
+func (e *depError) Unwrap() error {
+	return e.err
+}
+
+func (e *depError) Error() string {
+	return fmt.Sprintf("%s failed for dependency %q: %s", e.action, e.dep.cfg.ContainerName(), e.err.Error())
+}
+
+func (w *Watcher) newDepError(action string, dep *dependency, err error) error {
+	if errors.Is(err, causeReload) {
+		return nil
+	}
+	if dErr, ok := err.(*depError); ok { //nolint:errorlint
+		return dErr
+	}
+	return w.newWatcherError(&depError{action: action, dep: dep, err: convertError(err)})
+}
+
+func convertError(err error) error {
+	switch {
+	case err == nil:
+		return nil
+	case errors.Is(err, context.DeadlineExceeded):
+		return errors.New("timeout")
+	default:
+		return err
+	}
+}