[KVM-AUTOTEST PATCH 03/06] kvm_vm.py: add new VM parameter 'x11_display' that controls $DISPLAY

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If x11_display is specified, the DISPLAY environment variable
is set to this value for the QEMU process. This may be useful
for SDL rendering. Also add some comments.

Signed-off-by: Michael Goldish <mgoldish@xxxxxxxxxx>
---
 client/tests/kvm/kvm_vm.py |   13 ++++++++++++-
 1 files changed, 12 insertions(+), 1 deletions(-)

diff --git a/client/tests/kvm/kvm_vm.py b/client/tests/kvm/kvm_vm.py
index e2b684c..6de3989 100644
--- a/client/tests/kvm/kvm_vm.py
+++ b/client/tests/kvm/kvm_vm.py
@@ -196,6 +196,9 @@ class VM:
                (iso_dir is pre-pended to the ISO filename)
                extra_params -- a string to append to the qemu command
                ssh_port -- should be 22 for SSH, 23 for Telnet
+               x11_display -- if specified, the DISPLAY environment variable
+               will be be set to this value for the qemu process (useful for
+               SDL rendering)
                images -- a list of image object names, separated by spaces
                nics -- a list of NIC object names, separated by spaces
 
@@ -222,8 +225,16 @@ class VM:
         if iso_dir == None:
             iso_dir = self.iso_dir
 
-        qemu_cmd = qemu_path
+        # Start constructing the qemu command
+        qemu_cmd = ""
+        # Set the X11 display parameter if requested
+        if params.get("x11_display"):
+            qemu_cmd += "DISPLAY=%s " % params.get("x11_display")
+        # Add the qemu binary
+        qemu_cmd += qemu_path
+        # Add the VM's name
         qemu_cmd += " -name '%s'" % name
+        # Add the monitor socket parameter
         qemu_cmd += " -monitor unix:%s,server,nowait" % self.monitor_file_name
 
         for image_name in kvm_utils.get_sub_dict_names(params, "images"):
-- 
1.6.2.2

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