[process-agent] Use the same hostname lookup call when building the h…

…ostInfo in the core agent (#22941)

[process-agent] Use the same hostname lookup call when building the hostInfo in the core agent

pkg/process/checks/host_info.go

@@ -20,7 +20,9 @@ import (
 	"github.com/DataDog/datadog-agent/pkg/config"
 	pb "github.com/DataDog/datadog-agent/pkg/proto/pbgo/core"
 	"github.com/DataDog/datadog-agent/pkg/util/fargate"
+	"github.com/DataDog/datadog-agent/pkg/util/flavor"
 	ddgrpc "github.com/DataDog/datadog-agent/pkg/util/grpc"
+	"github.com/DataDog/datadog-agent/pkg/util/hostname"
 	"github.com/DataDog/datadog-agent/pkg/util/hostname/validate"
 	"github.com/DataDog/datadog-agent/pkg/util/log"
 )
@@ -63,6 +65,15 @@ func resolveHostName(config config.Reader) (string, error) {
 		agentBin := config.GetString("process_config.dd_agent_bin")
 		connectionTimeout := config.GetDuration("process_config.grpc_connection_timeout_secs") * time.Second
 		var err error
+		// TODO: We should migrate to the common hostname component
+		if flavor.GetFlavor() == flavor.DefaultAgent {
+			hostName, err = hostname.Get(context.TODO())
+			if err != nil {
+				return "", fmt.Errorf("error while getting hostname: %v", err)
+			}
+			return hostName, nil
+		}
+
 		hostName, err = getHostname(context.Background(), agentBin, connectionTimeout)
 		if err != nil {
 			return "", log.Errorf("cannot get hostname: %v", err)

pkg/process/checks/host_info_test.go

@@ -21,6 +21,7 @@ import (
 	"github.com/DataDog/datadog-agent/pkg/config"
 	pb "github.com/DataDog/datadog-agent/pkg/proto/pbgo/core"
 	pbmocks "github.com/DataDog/datadog-agent/pkg/proto/pbgo/mocks/core"
+	"github.com/DataDog/datadog-agent/pkg/util/flavor"
 )
 
 func TestGetHostname(t *testing.T) {
@@ -81,6 +82,11 @@ func TestGetHostnameFromCmd(t *testing.T) {
 }
 
 func TestInvalidHostname(t *testing.T) {
+	oldFlavor := flavor.GetFlavor()
+	defer flavor.SetFlavor(oldFlavor)
+
+	flavor.SetFlavor(flavor.ProcessAgent)
+
 	cfg := config.Mock(t)
 
 	// Lower the GRPC timeout, otherwise the test will time out in CI