Don't follow libraries which won't be copied.

Changelog

@@ -23,6 +23,10 @@ Releases
 
   First release that requires Python 3.
 
+  * Fixed issue where Delocate would attempt to modify the install names of a
+    non-copied library which dynamically links to a copied library.
+    [#120](https://github.com/matthew-brett/delocate/pull/120)
+
 * 0.9.0 (Saturday July 17th 2021)
 
   Refactoring, updating and `arm64` (M1) support.

delocate/delocating.py

@@ -382,6 +382,7 @@ def delocate_path(
         Default is callable rejecting only libraries beginning with
         ``/usr/lib`` or ``/System``.  None means copy all libraries. This will
         usually end up copying large parts of the system run-time.
+        Libraries which won't be copied will not be inspected for dependencies.
     executable_path : None or str, optional
         If not None, an alternative path to use for resolving
         `@executable_path`.
@@ -410,23 +411,27 @@ def delocate_path(
         raise TypeError('lib_filt_func string can only be "dylibs-only"')
     if lib_filt_func is None:
         lib_filt_func = (lambda _: True)
+    if copy_filt_func is None:
+        copy_filt_func = (lambda _: True)
     if not exists(lib_path):
         os.makedirs(lib_path)
+    # Do not inspect dependencies of libraries that will not be copied.
+    filt_func = (lambda path: lib_filt_func(path) and copy_filt_func(path))
 
     lib_dict = {}  # type: Dict[Text, Dict[Text, Text]]
     missing_libs = False
     for library_path in walk_directory(
-        tree_path, lib_filt_func, executable_path=executable_path
+        tree_path, filt_func, executable_path=executable_path
     ):
         for depending_path, install_name in get_dependencies(
             library_path,
             executable_path=executable_path,
-            filt_func=lib_filt_func,
+            filt_func=filt_func,
         ):
             if depending_path is None:
                 missing_libs = True
                 continue
-            if copy_filt_func and not copy_filt_func(depending_path):
+            if not filt_func(depending_path):
                 continue
             lib_dict.setdefault(depending_path, {})
             lib_dict[depending_path][library_path] = install_name

delocate/tests/test_wheelies.py

@@ -184,17 +184,9 @@ def func(fn):
 
         assert_equal(delocate_wheel('test.whl', lib_filt_func=func), {})
         # Default - looks in every file
-        shutil.copyfile('test.whl', 'test2.whl')  # for following test
         dep_mod = pjoin('fakepkg1', 'subpkg', 'module.other')
         assert_equal(delocate_wheel('test.whl'),
                      {realpath(stray_lib): {dep_mod: stray_lib}})
-        # With func that does find the module
-
-        def func(fn):
-            return fn.endswith('.other')
-
-        assert_equal(delocate_wheel('test2.whl', lib_filt_func=func),
-                     {realpath(stray_lib): {dep_mod: stray_lib}})
 
 
 def _thin_lib(stray_lib, arch):
@@ -322,3 +314,26 @@ def test_fix_rpath():
         with InWheel('tmp.whl'):
             check_call(['codesign', '--verify',
                         'fakepkg/.dylibs/libextfunc_rpath.dylib'])
+
+        # Now test filters with recursive dependencies.
+        def ignore_libextfunc(path: str) -> bool:
+            """Ignore libextfunc which will also ignore its dependency and
+            include no files.
+            """
+            return "libextfunc_rpath.dylib" not in path
+
+        assert delocate_wheel(
+            RPATH_WHEEL, 'tmp.whl', lib_filt_func=ignore_libextfunc) == {}
+
+        def ignore_libextfunc2(path: str) -> bool:
+            """Ignore libextfunc2.  libextfunc will still be bundled."""
+            return "libextfunc2_rpath.dylib" not in path
+
+        # Only the direct dependencies of module2.abi3.so
+        stray_libs_only_direct = {
+            realpath('libs/libextfunc_rpath.dylib'): {dep_mod: dep_path},
+        }
+
+        assert delocate_wheel(
+            RPATH_WHEEL, 'tmp.whl', lib_filt_func=ignore_libextfunc2
+        ) == stray_libs_only_direct