[OE-core] [PATCH] patch.bbclass: unset TMPDIR after use

[Ross Burton]

GNU Patch < 2.6.1 has a race condition so we create a per-instance TMPDIR to
avoid this.  This was implemented by setting os.environ[TMPDIR] but at the end
of do_patch the temporary directory is deleted but TMPDIR is not unset.

In general this doesn't cause a problem but if do_patch is embedded in a larger
function then TMPDIR is set to a directory that doesn't exist.  Avoid this by
removing TMPDIR from os.environ when the directory is deleted.

Signed-off-by: Ross Burton <ross.burton at intel.com>
---
 meta/classes/patch.bbclass |    1 +
 1 file changed, 1 insertion(+)

diff --git a/meta/classes/patch.bbclass b/meta/classes/patch.bbclass
index 86c65b3..1e2aab0 100644
--- a/meta/classes/patch.bbclass
+++ b/meta/classes/patch.bbclass
@@ -177,6 +177,7 @@ python patch_do_patch() {
             bb.fatal(str(e))
 
     bb.utils.remove(process_tmpdir, True)
+    del os.environ['TMPDIR']
 }
 patch_do_patch[vardepsexclude] = "PATCHRESOLVE"
 
-- 
1.7.10.4