1package system // import "github.com/ory/dockertest/docker/pkg/system"
2
3import "golang.org/x/sys/unix"
4
5// Lgetxattr retrieves the value of the extended attribute identified by attr
6// and associated with the given path in the file system.
7// It will returns a nil slice and nil error if the xattr is not set.
8func Lgetxattr(path string, attr string) ([]byte, error) {
9	dest := make([]byte, 128)
10	sz, errno := unix.Lgetxattr(path, attr, dest)
11	if errno == unix.ENODATA {
12		return nil, nil
13	}
14	if errno == unix.ERANGE {
15		dest = make([]byte, sz)
16		sz, errno = unix.Lgetxattr(path, attr, dest)
17	}
18	if errno != nil {
19		return nil, errno
20	}
21
22	return dest[:sz], nil
23}
24
25// Lsetxattr sets the value of the extended attribute identified by attr
26// and associated with the given path in the file system.
27func Lsetxattr(path string, attr string, data []byte, flags int) error {
28	return unix.Lsetxattr(path, attr, data, flags)
29}
30