[OE-core] [PATCH] base.bbclass: If unpacking again, wipe out ${S}/patches

[Richard Purdie]

If we unpack again, its assumed the data in any patches directory is invalid
since do_patch will run again. This ensures old patch data doesn't get
reused in a confused way.

Ideally we should probably wipe out ${S} here but that is probably a change
for another time.

[YOCTO #2043 partially]

Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
---
diff --git a/meta/classes/base.bbclass b/meta/classes/base.bbclass
index a76fe55..39d3e78 100644
--- a/meta/classes/base.bbclass
+++ b/meta/classes/base.bbclass
@@ -94,6 +94,7 @@ python base_do_fetch() {
 
 addtask unpack after do_fetch
 do_unpack[dirs] = "${WORKDIR}"
+do_unpack[cleandirs] = "${S}/patches"
 python base_do_unpack() {
 	src_uri = (d.getVar('SRC_URI', True) or "").split()
 	if len(src_uri) == 0: