daemon: Check system requirements in newDaemonCLI

htoyoda18 · htoyoda18 · commit b0c8ff7d0c99 · 2026-01-20T03:28:25.000+09:00
Move CheckSystem() call to newDaemonCLI() for earlier validation
of platform-specific requirements.

Signed-off-by: hiroto.toyoda &lt;hiroto.toyoda@dena.com&gt;
diff --git a/daemon/command/daemon.go b/daemon/command/daemon.go
@@ -93,6 +93,12 @@ func newDaemonCLI(opts *daemonOptions) (*daemonCLI, error) {
 		return nil, err
 	}
 
+	// Verify platform-specific requirements.
+	// This is checked early so that `dockerd --validate` also validates system requirements.
+	if err := daemon.CheckSystem(); err != nil {
+		return nil, fmt.Errorf("system requirements not met: %w", err)
+	}
+
 	return &daemonCLI{
 		Config:       cfg,
 		configFile:   &opts.configFile,
@@ -114,11 +120,6 @@ func (cli *daemonCLI) start(ctx context.Context) (err error) {
 		debug.Enable()
 	}
 
-	// Verify platform-specific requirements before proceeding with daemon initialization
-	if err := daemon.CheckSystem(); err != nil {
-		return fmt.Errorf("system requirements not met: %w", err)
-	}
-
 	if rootless.RunningWithRootlessKit() && !cli.Config.IsRootless() {
 		return errors.New("rootless mode needs to be enabled for running with RootlessKit")
 	}
