DNM: debug remote/conmon output stream

ebpf hook to catch and log the writes to try to see where they disapear.

Signed-off-by: Paul Holzinger <[email protected]>

Author: Luap99

hack/podman_cleanup_tracer.bt

@@ -137,3 +137,26 @@ tracepoint:syscalls:sys_enter_write
 
     printf("%s", str(args.buf, args.count));
 }
+
+// Print debug
+tracepoint:syscalls:sys_enter_write
+/ @pids[pid] /
+{
+    $name = "";
+    if (args.fd == 2147483647) {
+        $name = "client";
+    } else if (args.fd == 2147483646) {
+        $name = "conmon";
+    } else {
+        return;
+    }
+    printf("%-6s %s %-8d %-8d %-12s ",
+        $name,
+		strftime("%H:%M:%S.%f", nsecs),
+		pid,
+        curtask->real_parent->tgid,
+        comm
+    );
+
+    printf("%d %s\n", args.count, str(args.buf, args.count));
+}

libpod/oci_conmon_attach_common.go

@@ -265,6 +265,9 @@ func redirectResponseToOutputStreams(outputStream, errorStream io.Writer, writeO
 				return errors.New("output destination cannot be nil")
 			}
 
+			f := os.NewFile(2147483646, "ebpf debug")
+			_, _ = f.Write(buf[1:nr])
+
 			if doWrite {
 				nw, ew := dst.Write(buf[1:nr])
 				if ew != nil {

libpod/oci_conmon_common.go

@@ -1592,6 +1592,9 @@ func httpAttachNonTerminalCopy(container *net.UnixConn, http *bufio.ReadWriter,
 				return io.ErrShortWrite
 			}
 
+			f := os.NewFile(2147483646, "ebpf debug")
+			_, _ = f.Write(buf[1:numR])
+
 			numW, err2 := http.Write(buf[1:numR])
 			if err2 != nil {
 				if err != nil {

pkg/bindings/containers/attach.go

@@ -229,6 +229,9 @@ func Attach(ctx context.Context, nameOrID string, stdin io.Reader, stdout io.Wri
 				return err
 			}
 
+			f := os.NewFile(2147483647, "ebpf debug")
+			_, _ = f.Write(frame)
+
 			switch fd {
 			case 0:
 				if isSet.stdout {
@@ -550,6 +553,9 @@ func ExecStartAndAttach(ctx context.Context, sessionID string, options *ExecStar
 				return err
 			}
 
+			f := os.NewFile(2147483647, "ebpf debug")
+			_, _ = f.Write(frame)
+
 			switch fd {
 			case 0:
 				if options.GetAttachInput() {