[OE-core] [PATCH] buildstats: Fix trackbacks for early task failures

[Richard Purdie]

If a failure occurs early in the task, its possible we can have a
TaskFailed before the TaskStarted event can be triggered. This in
turn causes another traceback as the directory buildstats writes 
files into doesn't exist.

Ensure the directory exists so we can see the original error.
    
Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>

diff --git a/meta/classes/buildstats.bbclass b/meta/classes/buildstats.bbclass
index d381c93..ab72af5 100644
--- a/meta/classes/buildstats.bbclass
+++ b/meta/classes/buildstats.bbclass
@@ -195,6 +195,8 @@ python run_buildstats () {
                 f.write("Uncompressed Rootfs size: %s" % rootfs_size)
 
     elif isinstance(e, bb.build.TaskFailed):
+        # Can have a failure before TaskStarted so need to mkdir here too
+        bb.utils.mkdirhier(taskdir)
         write_task_data("failed", os.path.join(taskdir, e.task), e, d)
         ########################################################################
         # Lets make things easier and tell people where the build failed in