Merge pull request #1422 from aparcar/ln-short

util: use short `ln` options for Busybox compat

Author: Emantor

labgrid/util/managedfile.py

@@ -74,9 +74,9 @@ def sync_to_resource(self, symlink=None):
                     conn.run_check(f"test ! -e {symlink} -o -L {symlink}")
                 except ExecutionError:
                     raise ManagedFileError(f"Path {symlink} exists but is not a symlink.")
-                conn.run_check(
-                    f"ln --symbolic --force --no-dereference {self.rpath}{os.path.basename(self.local_path)} {symlink}"  # pylint: disable=line-too-long
-                )
+                # use short options to be compatible with busybox
+                # --symbolic --force --no-dereference
+                conn.run_check(f"ln -sfn {self.rpath}{os.path.basename(self.local_path)} {symlink}")
 
 
     def _on_nfs(self, conn):