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package pin
import (
"fmt"
"io/fs"
"os"
"path/filepath"
"github.com/cilium/ebpf/internal/linux"
"github.com/cilium/ebpf/internal/unix"
)
// WalkDirFunc is the type of the function called for each object visited by
// [WalkDir]. It's identical to [fs.WalkDirFunc], but with an extra [Pinner]
// argument. If the visited node is a directory, obj is nil.
//
// err contains any errors encountered during bpffs traversal or object loading.
type WalkDirFunc func(path string, d fs.DirEntry, obj Pinner, err error) error
// WalkDir walks the file tree rooted at path, calling bpffn for each node in
// the tree, including directories. Running WalkDir on a non-bpf filesystem is
// an error. Otherwise identical in behavior to [fs.WalkDir].
//
// See the [WalkDirFunc] for more information.
func WalkDir(root string, bpffn WalkDirFunc) error {
fsType, err := linux.FSType(root)
if err != nil {
return err
}
if fsType != unix.BPF_FS_MAGIC {
return fmt.Errorf("%s is not on a bpf filesystem", root)
}
fn := func(path string, d fs.DirEntry, err error) error {
if err != nil {
return bpffn(path, nil, nil, err)
}
if d.IsDir() {
return bpffn(path, d, nil, err)
}
obj, err := Load(filepath.Join(root, path), nil)
return bpffn(path, d, obj, err)
}
return fs.WalkDir(os.DirFS(root), ".", fn)
}
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