[PATCH] image: Ensure we don't expand TMPDIR in image commands

[Richard Purdie <richard.purdie@linuxfoundation.org>]

Similarly to DATETIME, don't expand TMPDIR in image commands.
This ensures some of the stamp comparisons we make in the
QA tests work correctly.

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

diff --git a/meta/classes/image.bbclass b/meta/classes/image.bbclass
index a2e966e..e85869d 100644
--- a/meta/classes/image.bbclass
+++ b/meta/classes/image.bbclass
@@ -369,7 +369,9 @@ python () {
         # Delete DATETIME so we don't expand any references to it now
         # This means the task's hash can be stable rather than having hardcoded
         # date/time values. It will get expanded at execution time.
+        # Similarly TMPDIR since otherwise we see QA stamp comparision problems
         localdata.delVar('DATETIME')
+        localdata.delVar('TMPDIR')
 
         image_cmd = localdata.getVar("IMAGE_CMD", True)
         vardeps.add('IMAGE_CMD_' + realt)