mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
4138cd22ab
If `unix.Lgetxattr` returns an error, then `sz == -1` which will cause a runtime panic if `errno == unix.ERANGE`. Signed-off-by: Sascha Grunert <sgrunert@suse.com>
38 lines
1.2 KiB
Go
38 lines
1.2 KiB
Go
package system // import "github.com/docker/docker/pkg/system"
|
|
|
|
import "golang.org/x/sys/unix"
|
|
|
|
// Lgetxattr retrieves the value of the extended attribute identified by attr
|
|
// and associated with the given path in the file system.
|
|
// It will returns a nil slice and nil error if the xattr is not set.
|
|
func Lgetxattr(path string, attr string) ([]byte, error) {
|
|
// Start with a 128 length byte array
|
|
dest := make([]byte, 128)
|
|
sz, errno := unix.Lgetxattr(path, attr, dest)
|
|
|
|
switch {
|
|
case errno == unix.ENODATA:
|
|
return nil, nil
|
|
case errno == unix.ERANGE:
|
|
// 128 byte array might just not be good enough. A dummy buffer is used
|
|
// to get the real size of the xattrs on disk
|
|
sz, errno = unix.Lgetxattr(path, attr, []byte{})
|
|
if errno != nil {
|
|
return nil, errno
|
|
}
|
|
dest = make([]byte, sz)
|
|
sz, errno = unix.Lgetxattr(path, attr, dest)
|
|
if errno != nil {
|
|
return nil, errno
|
|
}
|
|
case errno != nil:
|
|
return nil, errno
|
|
}
|
|
return dest[:sz], nil
|
|
}
|
|
|
|
// Lsetxattr sets the value of the extended attribute identified by attr
|
|
// and associated with the given path in the file system.
|
|
func Lsetxattr(path string, attr string, data []byte, flags int) error {
|
|
return unix.Lsetxattr(path, attr, data, flags)
|
|
}
|