[PATCH 4/6] oeqa/x32lib: rework to use readelf from the host

["Alexander Kanavin" <alex.kanavin@gmail.com>]

It is difficult and error-prone to ensure binutils gets
installed into target images where this test may run;
on the other hand readelf is always present on the
host, as it is a part of HOSTTOOLS.

Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
---
 meta/lib/oeqa/runtime/cases/x32lib.py | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/meta/lib/oeqa/runtime/cases/x32lib.py b/meta/lib/oeqa/runtime/cases/x32lib.py
index ddf220140e..f419c8f181 100644
--- a/meta/lib/oeqa/runtime/cases/x32lib.py
+++ b/meta/lib/oeqa/runtime/cases/x32lib.py
@@ -6,16 +6,21 @@ from oeqa.runtime.case import OERuntimeTestCase
 from oeqa.core.decorator.depends import OETestDepends
 from oeqa.core.decorator.data import skipIfNotInDataVar
 
+import subprocess
+
 class X32libTest(OERuntimeTestCase):
 
     @skipIfNotInDataVar('DEFAULTTUNE', 'x86-64-x32',
                         'DEFAULTTUNE is not set to x86-64-x32')
     @OETestDepends(['ssh.SSHTest.test_ssh'])
     def test_x32_file(self):
-        cmd = 'readelf -h /bin/ls | grep Class | grep ELF32'
-        status1 = self.target.run(cmd)[0]
-        cmd = 'readelf -h /bin/ls | grep Machine | grep X86-64'
-        status2 = self.target.run(cmd)[0]
-        msg = ("/bin/ls isn't an X86-64 ELF32 binary. readelf says: %s" % 
-                self.target.run("readelf -h /bin/ls")[1])
+        dest = self.td.get('T', '') + "/ls.x32test"
+        self.target.copyFrom("/bin/ls", dest)
+        cmd = 'readelf -h {} | grep Class | grep ELF32'.format(dest)
+        status1 = subprocess.call(cmd, shell=True)
+        cmd = 'readelf -h {} | grep Machine | grep X86-64'.format(dest)
+        status2 = subprocess.call(cmd, shell=True)
+        msg = ("/bin/ls isn't an X86-64 ELF32 binary. readelf says:\n{}".format(
+                subprocess.check_output("readelf -h {}".format(dest), shell=True).decode()))
+        os.remove(dest)
         self.assertTrue(status1 == 0 and status2 == 0, msg=msg)
-- 
2.28.0