[wic][PATCH 0/4] oe/path: three fixes plus unit coverage

This series continues the standalone unit-test work, this time over
oe/path.py. It follows the same shape the suite settled on: each
source fix is its own standalone commit, and the green test module
lands last, so the suite passes at every commit.

Three fixes come first, each independent of the others:

  - __realpath's isdir guard assigns a bare `false`, which is not a
    Python name; when os.path.isdir() raises, the handler meant to
    absorb the error raises NameError instead. Use the builtin False.
  - symlink(force=True) cleared the destination through remove(), which
    globs its argument; a destination containing glob metacharacters
    could fail to match itself or match unrelated files. Remove the
    literal destination instead.
  - canonicalize('') and canonicalize(None) returned the current
    working directory, because os.path.realpath('') does; a stray
    separator injected a spurious cwd entry too. Skip empty tokens.

The final commit adds tests/unit/test_oe_path.py, covering oe/path's
own logic (join, is_path_parent, symlink, make_relative_symlink,
canonicalize, which_wild, realpath) and locking in the three fixes.
Backing any fix out turns the matching test red. The suite is green
and ruff-clean, and the series passes oe-core's wic oe-selftest with
no regressions.

Trevor Woerner (4):
  oe/path: fix bare `false` NameError in __realpath's isdir guard
  oe/path: don't glob-expand the destination in symlink(force=True)
  oe/path: canonicalize('') should return '' rather than the cwd
  tests/unit/test_oe_path: cover oe/path's own path logic

 src/wic/oe/path.py         |  21 ++-
 tests/unit/test_oe_path.py | 298 +++++++++++++++++++++++++++++++++++++
 2 files changed, 316 insertions(+), 3 deletions(-)
 create mode 100644 tests/unit/test_oe_path.py

-- 
2.50.0.173.g8b6f19ccfc3a