python3-lxml: check the return value

Check the return value in subprocess to guarantee the subprocess
execute successfully or not as after [1] introduced to limit the
netowork, there some difference during do_compile phase as below.
Before the change
 # python
 Python 3.8.10 (default, Nov 26 2021, 20:14:08)
 [GCC 9.3.0] on linux
 Type "help", "copyright", "credits" or "license" for more information.
 >>> import subprocess
 >>> cmd = "pkg-config --modversion libxml-2.0"
 >>> p = subprocess.Popen(cmd, shell=True,stdout=subprocess.PIPE, stderr=subprocess.PIPE)
 >>> stdout_data, errors = p.communicate()
 >>> print(stdout_data)
 b'2.9.12\n'
 >>> print(errors)
 b''
 >>>

After the change
 # python
 Python 3.8.10 (default, Nov 26 2021, 20:14:08)
 [GCC 9.3.0] on linux
 Type "help", "copyright", "credits" or "license" for more information.
 >>> import subprocess
 >>> cmd = "pkg-config --modversion libxml-2.0"
 >>> p = subprocess.Popen(cmd, shell=True,stdout=subprocess.PIPE, stderr=subprocess.PIPE)
 >>> stdout_data, errors = p.communicate()
 >>> print(stdout_data)
 b'2.9.12\n'
 >>> print(errors)
 b'do_ypcall: clnt_call: RPC: Unable to send; errno = Network is unreachable\n'
 >>>

[1] https://git.openembedded.org/bitbake/commit/?id=0746b6a2a32fec4c18bf1a52b1454ca4c04bf543

Signed-off-by: Mingli Yu <mingli.yu@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Trevor Gamblin <trevor.gamblin@windriver.com>

meta-python/recipes-devtools/python/python3-lxml/0001-setupinfo.py-check-the-return-value.patch

@@ -0,0 +1,46 @@
+From 057872fa40e061100d61117cee5c3413ef2e40fc Mon Sep 17 00:00:00 2001
+From: Mingli Yu <mingli.yu@windriver.com>
+Date: Thu, 20 Jan 2022 15:18:20 +0800
+Subject: [PATCH] setupinfo.py: check the return value
+
+Use the return value altogether to check the subprocess execute
+successfully or not as in some case it will print some noise
+message though run successfully as below.
+
+ # python
+ Python 3.8.10 (default, Nov 26 2021, 20:14:08)
+ [GCC 9.3.0] on linux
+ Type "help", "copyright", "credits" or "license" for more information.
+ >>> import subprocess
+ >>> cmd = "pkg-config --modversion libxml-2.0"
+ >>> p = subprocess.Popen(cmd, shell=True,stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+ >>> stdout_data, errors = p.communicate()
+ >>> print(stdout_data)
+ b'2.9.12\n'
+ >>> print(errors)
+ b'do_ypcall: clnt_call: RPC: Unable to send; errno = Network is unreachable\n'
+ >>>
+
+Upstream-Status: Submitted [https://github.com/lxml/lxml/pull/336]
+
+Signed-off-by: Mingli Yu <mingli.yu@windriver.com>
+---
+ setupinfo.py | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/setupinfo.py b/setupinfo.py
+index 8c2a36fb..c1247c6d 100644
+--- a/setupinfo.py
++++ b/setupinfo.py
+@@ -365,7 +365,7 @@ def run_command(cmd, *args):
+                          stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+     stdout_data, errors = p.communicate()
+ 
+-    if errors:
++    if p.returncode != 0 and errors:
+         return ''
+     return decode_input(stdout_data).strip()
+ 
+-- 
+2.17.1
+

meta-python/recipes-devtools/python/python3-lxml_4.7.1.bb

@@ -20,6 +20,9 @@ DEPENDS += "libxml2 libxslt"
 
 SRC_URI[sha256sum] = "a1613838aa6b89af4ba10a0f3a972836128801ed008078f8c1244e65958f1b24"
 
+SRC_URI += " \
+           file://0001-setupinfo.py-check-the-return-value.patch \
+"
 inherit pkgconfig pypi setuptools3
 
 # {standard input}: Assembler messages: