[PATCH] cooker: fix -w with a file name that has no directory

[Babanpreet Singh <bbnpreetsingh@gmail.com>]

"bitbake -w events.json" fails with:

  FileNotFoundError: [Errno 2] No such file or directory: ''

There is no directory to create for a bare file name, so don't try.

Fixes: ee174b231897 ("cooker: Add support for BB_DEFAULT_EVENTLOG")
Signed-off-by: Babanpreet Singh <bbnpreetsingh@gmail.com>
---

Notes:
    Found while looking at YOCTO #16492. Applies with or without Mathieu's
    patch for that bug.

 lib/bb/cooker.py       |  5 +++--
 lib/bb/tests/cooker.py | 18 ++++++++++++++++++
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/lib/bb/cooker.py b/lib/bb/cooker.py
index 8a422e506..f79cd5e6c 100644
--- a/lib/bb/cooker.py
+++ b/lib/bb/cooker.py
@@ -457,8 +457,9 @@ You can also remove the BB_HASHSERVE_UPSTREAM setting, but this may result in si
         if not self.eventlog or self.eventlog[0] != eventlog:
             # we log all events to a file if so directed
             # register the log file writer as UI Handler
-            if not os.path.exists(os.path.dirname(eventlog)):
-                bb.utils.mkdirhier(os.path.dirname(eventlog))
+            dirname = os.path.dirname(eventlog)
+            if dirname and not os.path.exists(dirname):
+                bb.utils.mkdirhier(dirname)
             writer = EventWriter(self, eventlog)
             EventLogWriteHandler = namedtuple('EventLogWriteHandler', ['event'])
             self.eventlog = (eventlog, bb.event.register_UIHhandler(EventLogWriteHandler(writer)), writer)
diff --git a/lib/bb/tests/cooker.py b/lib/bb/tests/cooker.py
index db4104d40..c6a0cac2a 100644
--- a/lib/bb/tests/cooker.py
+++ b/lib/bb/tests/cooker.py
@@ -409,3 +409,21 @@ addtask marker
             with open(os.path.join(builddir, "marker.log")) as f:
                 self.assertEqual(f.read(), "bbappend-applied",
                                  "bitbake -b did not apply the recipe's bbappend")
+
+
+class EventLogTest(_BitbakeSubprocessTestCase):
+    """Tests for the event log ("bitbake -w")."""
+
+    _parsetests = os.path.realpath(os.path.join(os.path.dirname(__file__), "parse-tests"))
+
+    def test_write_log_bare_filename(self):
+        """bitbake -w must accept a file name without a directory."""
+        with self._build_dir(prefix="eventlogtest") as builddir:
+            env = os.environ.copy()
+            env["BBPATH"] = self._parsetests
+            env["BB_ENV_PASSTHROUGH_ADDITIONS"] = "TOPDIR"
+            env["TOPDIR"] = builddir
+
+            self._run_subprocess(["bitbake", "-w", "events.json", "-e"], env, builddir)
+
+            self.assertTrue(os.path.exists(os.path.join(builddir, "events.json")))
-- 
2.43.0