bitbake: utils: Fix lockfile path length issues

If the path to bitbake.lock is in a deep directory, bitbake will hang. The
reason was that the max file length limiting code (to 255 chars) was including
the directory name and it should only act on the filename within the directory.
Fix it to just use the base filename.

[YOCTO #14766]

(Bitbake rev: 89d70e7b71eecfe06592202f326e566c579ba01d)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/utils.py

@@ -453,13 +453,16 @@ def lockfile(name, shared=False, retry=True, block=False):
     consider the possibility of sending a signal to the process to break
     out - at which point you want block=True rather than retry=True.
     """
-    if len(name) > 255:
-        root, ext = os.path.splitext(name)
-        name = root[:255 - len(ext)] + ext
+    basename = os.path.basename(name)
+    if len(basename) > 255:
+        root, ext = os.path.splitext(basename)
+        basename = root[:255 - len(ext)] + ext
 
     dirname = os.path.dirname(name)
     mkdirhier(dirname)
 
+    name = os.path.join(dirname, basename)
+
     if not os.access(dirname, os.W_OK):
         logger.error("Unable to acquire lock '%s', directory is not writable",
                      name)