[poky] [PATCH 1/1] base.bbclass: add lock file for do_unpack task

[Yu Ke]

This patch intend to fix the random unpack failure of linux-libc-headers-yocto
and linux-yocto.

The root cause of the unpack failure is that: these two recpies has the same URL, thus
has the same dest file during the fetch and unpack phase:
do_fetch  : create tar ball ${DL_DIR}/git_git.pokylinux.org.linux-yocto-2.6.37.tar.gz
do_unpack : extract tar ball ${DL_DIR}/git_git.pokylinux.org.linux-yocto-2.6.37.tar.gz
fetch phase is protected by lockfile, so it works fine. but unpack phase is not lock protected,
thus there is race condition like: when linux-yocto do_unpack is extracting the tar ball,
linux-libc-headers-yocto do_fetch starts to create tar ball thus overwrite linux-yocto's
tar ball and cause linux-yocto do_unpack failure

To fix this issue, do_unpack also need to be protected by lock

Signed-off-by: Yu Ke <ke.yu at intel.com>
---
 meta/classes/base.bbclass |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/meta/classes/base.bbclass b/meta/classes/base.bbclass
index 54a1dcd..f8ce123 100644
--- a/meta/classes/base.bbclass
+++ b/meta/classes/base.bbclass
@@ -242,6 +242,8 @@ python base_do_unpack() {
 	localdata = bb.data.createCopy(d)
 	bb.data.update_data(localdata)
 
+	urldata = bb.fetch.init([], localdata, True)
+
 	src_uri = bb.data.getVar('SRC_URI', localdata, True)
 	if not src_uri:
 		return
@@ -253,7 +255,9 @@ python base_do_unpack() {
 		if local is None:
 			continue
 		local = os.path.realpath(local)
+		lf = bb.utils.lockfile(urldata[url].lockfile)
 		ret = oe_unpack_file(local, localdata, url)
+		bb.utils.unlockfile(lf)
 		if not ret:
 			raise bb.build.FuncFailed("oe_unpack_file failed with return value %s" % ret)
 }
-- 
1.7.0.4