FIX: Qemu path override

Currently there is bug that Qemu path is not correctly composed and
cannot be properly overriden due to race condition in code. This patch
is fixing functions to properly work with path.

Change-Id: I276458d2d23c7a14441a4de4a56eff6431242ab9
Signed-off-by: Peter Mikus <pmikus@cisco.com>

3 files changed, 19 insertions, 16 deletions

diff --git a/resources/libraries/python/QemuUtils.py b/resources/libraries/python/QemuUtils.py
index 6426394bf4..aa45ce08ef 100644
--- a/resources/libraries/python/QemuUtils.py
+++ b/resources/libraries/python/QemuUtils.py
@@ -29,7 +29,8 @@ class QemuUtils(object):
     def __init__(self, qemu_id=1):
         self._qemu_id = qemu_id
         # Path to QEMU binary. Use x86_64 by default
-        self._qemu_bin = '/usr/bin/qemu-system-x86_64'
+        self._qemu_path = '/usr/bin/'
+        self._qemu_bin = 'qemu-system-x86_64'
         # QEMU Machine Protocol socket
         self._qmp_sock = '/tmp/qmp{0}.sock'.format(self._qemu_id)
         # QEMU Guest Agent socket
@@ -71,13 +72,13 @@ class QemuUtils(object):
         self._node = None
         self._socks = [self._qmp_sock, self._qga_sock]
 
-    def qemu_set_bin(self, path):
+    def qemu_set_path(self, path):
         """Set binary path for QEMU.
 
         :param path: Absolute path in filesystem.
         :type path: str
         """
-        self._qemu_bin = path
+        self._qemu_path = path
 
     def qemu_set_smp(self, cpus, cores, threads, sockets):
         """Set SMP option for QEMU.
@@ -189,7 +190,7 @@ class QemuUtils(object):
         self._vm_info['host'] = node['host']
 
         arch = Topology.get_node_arch(node)
-        self._qemu_bin = '/usr/bin/qemu-system-{0}'.format(arch)
+        self._qemu_bin = 'qemu-system-{arch}'.format(arch=arch)
 
     def qemu_add_vhost_user_if(self, socket, server=True, mac=None):
         """Add Vhost-user interface.
@@ -518,6 +519,9 @@ class QemuUtils(object):
         .. note:: First set at least node to run QEMU on.
         .. warning:: Starts only one VM on the node.
         """
+        # Qemu binary path
+        bin_path = '{0}{1}'.format(self._qemu_path, self._qemu_bin)
+
         # SSH forwarding
         ssh_fwd = '-net user,hostfwd=tcp::{0}-:22'.format(
             self._qemu_opt.get('ssh_fwd_port'))
@@ -548,10 +552,10 @@ class QemuUtils(object):
         pid = '-pidfile {}'.format(self._pid_file)
 
         # Run QEMU
-        cmd = '{0} {1} {2} {3} {4} {5} {6} {7} {8} {9} {10}'.format(
-            self._qemu_bin, self._qemu_opt.get('smp'), mem, ssh_fwd,
-            self._qemu_opt.get('options'),
-            drive, qmp, serial, qga, graphic, pid)
+        cmd = '{0} {1} {2} {3} {4} {5} {6} {7} {8} {9} {10}'.format(bin_path,
+            self._qemu_opt.get('smp'), mem, ssh_fwd,
+            self._qemu_opt.get('options'), drive, qmp, serial, qga, graphic,
+            pid)
         try:
             (ret_code, _, _) = self._ssh.exec_command_sudo(cmd, timeout=300)
             if int(ret_code) != 0:
diff --git a/resources/libraries/robot/performance/performance_configuration.robot b/resources/libraries/robot/performance/performance_configuration.robot
index 52be3a26a8..641b808173 100644
--- a/resources/libraries/robot/performance/performance_configuration.robot
+++ b/resources/libraries/robot/performance/performance_configuration.robot
@@ -1457,7 +1457,7 @@
 | | ... | ${True}
 | | Run Keyword Unless | ${qemu_built} | ${vm_name}.Build QEMU | ${dut_node}
 | | ... | force_install=${True} | apply_patch=${apply_patch}
-| | Run keyword | ${vm_name}.Qemu Set Bin | ${perf_qemu_bin}
+| | Run keyword | ${vm_name}.Qemu Set Path | ${perf_qemu_path}
 | | Run keyword | ${vm_name}.Qemu Set Node | ${dut_node}
 | | Run keyword | ${vm_name}.Qemu Set Smp | ${count} | ${count} | 1 | 1
 | | Run keyword | ${vm_name}.Qemu Set Mem Size | 2048
@@ -1540,7 +1540,7 @@
 | | ... | ${True}
 | | Run Keyword Unless | ${qemu_built} | ${vm_name}.Build QEMU | ${dut_node}
 | | ... | force_install=${True} | apply_patch=${apply_patch}
-| | Run keyword | ${vm_name}.Qemu Set Bin | ${perf_qemu_bin}
+| | Run keyword | ${vm_name}.Qemu Set Path | ${perf_qemu_path}
 | | Run keyword | ${vm_name}.Qemu Set Node | ${dut_node}
 | | Run keyword | ${vm_name}.Qemu Set Smp | ${count} | ${count} | 1 | 1
 | | Run keyword | ${vm_name}.Qemu Set Mem Size | 2048
@@ -1605,7 +1605,7 @@
 | | ... | ${True}
 | | Run Keyword Unless | ${qemu_built} | ${vm_name}.Build QEMU | ${dut_node}
 | | ... | force_install=${True} | apply_patch=${apply_patch}
-| | Run keyword | ${vm_name}.Qemu Set Bin | ${perf_qemu_bin}
+| | Run keyword | ${vm_name}.Qemu Set Path | ${perf_qemu_path}
 | | Run keyword | ${vm_name}.Qemu Set Node | ${dut_node}
 | | Run keyword | ${vm_name}.Qemu Set Smp | ${count} | ${count} | 1 | 1
 | | Run keyword | ${vm_name}.Qemu Set Mem Size | 2048
@@ -1698,7 +1698,7 @@
 | | ... | ${True}
 | | Run Keyword Unless | ${qemu_built} | ${vm_name}.Build QEMU | ${dut_node}
 | | ... | force_install=${True} | apply_patch=${apply_patch}
-| | Run keyword | ${vm_name}.Qemu Set Bin | ${perf_qemu_bin}
+| | Run keyword | ${vm_name}.Qemu Set Path | ${perf_qemu_path}
 | | Run keyword | ${vm_name}.Qemu Set Node | ${dut_node}
 | | Run keyword | ${vm_name}.Qemu Set Smp | ${count} | ${count} | 1 | 1
 | | Run keyword | ${vm_name}.Qemu Set Mem Size | 2048
@@ -1746,7 +1746,7 @@
 | | ... | ${True}
 | | Run Keyword Unless | ${qemu_built} | ${vm_name}.Build QEMU | ${dut_node}
 | | ... | force_install=${True} | apply_patch=${apply_patch}
-| | Run keyword | ${vm_name}.Qemu Set Bin | ${perf_qemu_bin}
+| | Run keyword | ${vm_name}.Qemu Set Path | ${perf_qemu_path}
 | | Run keyword | ${vm_name}.Qemu Set Node | ${dut_node}
 | | Run keyword | ${vm_name}.Qemu Set Smp | ${count} | ${count} | 1 | 1
 | | Run keyword | ${vm_name}.Qemu Set Mem Size | 2048
@@ -1796,7 +1796,7 @@
 | | ... | ${True}
 | | Run Keyword Unless | ${qemu_built} | ${vm_name}.Build QEMU | ${dut_node}
 | | ... | force_install=${True} | apply_patch=${apply_patch}
-| | Run keyword | ${vm_name}.Qemu Set Bin | ${perf_qemu_bin}
+| | Run keyword | ${vm_name}.Qemu Set Path | ${perf_qemu_path}
 | | Run keyword | ${vm_name}.Qemu Set Node | ${dut_node}
 | | Run keyword | ${vm_name}.Qemu Set Smp | ${count} | ${count} | 1 | 1
 | | Run keyword | ${vm_name}.Qemu Set Mem Size | 2048
diff --git a/tests/vpp/perf/__init__.robot b/tests/vpp/perf/__init__.robot
index 9b65b05460..a50c1fd83f 100644
--- a/tests/vpp/perf/__init__.robot
+++ b/tests/vpp/perf/__init__.robot
@@ -45,8 +45,7 @@
 | | Set Global Variable | ${perf_pdr_loss_acceptance} | 0.5
 | | Set Global Variable | ${perf_pdr_loss_acceptance_type} | percentage
 | | Set Global Variable | ${perf_vm_image} | /var/lib/vm/csit-nested-1.7.img
-| | Set Global Variable | ${perf_qemu_bin}
-| | ... | /opt/qemu-2.5.0/bin/qemu-system-x86_64
+| | Set Global Variable | ${perf_qemu_path} | /opt/qemu-2.5.0/bin/
 | | Set Global Variable | ${perf_qemu_qsz} | 1024
 | | Set Global Variable | ${use_tuned_cfs} | ${False}
 | | Set Global Variable | ${qemu_built} | ${False}