tetra: Use new pin.WalkDir in debug progs

Using new pin.WalkDir interface to get all the tetragon
programs from bpffs directory.

Signed-off-by: Jiri Olsa <[email protected]>

cmd/tetra/debug/progs.go

@@ -9,6 +9,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"io/fs"
 	"log"
 	"os"
 	"path"
@@ -24,6 +25,7 @@ import (
 	"github.com/cilium/ebpf"
 	"github.com/cilium/ebpf/btf"
 	"github.com/cilium/ebpf/link"
+	"github.com/cilium/ebpf/pin"
 	"github.com/spf13/cobra"
 	"golang.org/x/sys/unix"
 	"golang.org/x/term"
@@ -403,50 +405,44 @@ func getTetragonProgs(base string) ([]*prog, error) {
 	var progs []*prog
 
 	// Walk bpffs/tetragon and look for programs
-	err := filepath.Walk(base,
-		func(path string, finfo os.FileInfo, err error) error {
-			if err != nil {
-				return err
-			}
-			if finfo.IsDir() {
-				return nil
-			}
-			if strings.HasSuffix(path, "/link") || strings.HasSuffix(path, "/link_override") {
-				return nil // skip BPF links, they make the syscall fail since cilium/ebpf@78074c59
-			}
-			p, err := ebpf.LoadPinnedProgram(path, nil)
-			if err != nil {
-				return err
-			}
-			defer p.Close()
+	err := pin.WalkDir(base, func(path string, d fs.DirEntry, obj pin.Pinner, err error) error {
+		if err != nil {
+			return err
+		}
+		if d.IsDir() {
+			return nil
+		}
 
-			if !isProg(p.FD()) {
-				return nil
-			}
+		p, ok := obj.(*ebpf.Program)
+		if !ok {
+			return nil
+		}
+		defer p.Close()
 
-			info, err := p.Info()
-			if err != nil {
-				return err
-			}
+		info, err := p.Info()
+		if err != nil {
+			return err
+		}
 
-			id, ok := info.ID()
-			if !ok {
-				return err
-			}
+		id, ok := info.ID()
+		if !ok {
+			return err
+		}
 
-			runTime, _ := info.Runtime()
-			runCnt, _ := info.RunCount()
-
-			progs = append(progs, &prog{
-				id:    uint32(id),
-				name:  getName(p, info),
-				pin:   path,
-				cnt:   runCnt,
-				time:  runTime,
-				alive: true,
-			})
-			return nil
+		runTime, _ := info.Runtime()
+		runCnt, _ := info.RunCount()
+
+		progs = append(progs, &prog{
+			id:    uint32(id),
+			name:  getName(p, info),
+			pin:   filepath.Join(base, path),
+			cnt:   runCnt,
+			time:  runTime,
+			alive: true,
 		})
+		return nil
+	})
+
 	return progs, err
 }