Adds required dependency for pxelinux.0 > 4.x

Change-Id: Ibb3ca337d6fb760da72bead6a64226bb68ed58f5

ramdisk_func_test/environment.py

@@ -52,10 +52,6 @@ CONF.register_opts([
     cfg.StrOpt('ramdisk_key',
                default='bareon_key',
                help='Name of private ssh key to access ramdisk'),
-    # NOTE(oberezovskyi): path from Centos 7 taken as default
-    cfg.StrOpt('pxelinux',
-               default='/usr/share/syslinux/pxelinux.0',
-               help='Path to pxelinux.0 file'),
     cfg.IntOpt('stub_webserver_port',
                default=8011,
                help='The port used by stub webserver')
@@ -64,6 +60,14 @@ CONF.import_opt('ramdisk_func_test_workdir', 'ramdisk_func_test.utils')
 
 LOG = logging.getLogger(__name__)
 
+PXELINUX_PATH = (
+    ('/usr/lib/PXELINUX/pxelinux.0',
+     '/usr/lib/syslinux/modules/bios/ldlinux.c32',),
+    ('/usr/share/syslinux/pxelinux.0', '/usr/share/syslinux/ldlinux.c32'),
+    ('/usr/share/syslinux/pxelinux.0',),
+    ('/usr/lib/syslinux/pxelinux.0',),
+)
+
 
 class Environment(object):
     _loaded_config = object()  # to fail comparison with None
@@ -154,9 +158,25 @@ class Environment(object):
         LOG.info("Setting up PXE configuration/images")
         tftp_root = self.network.tftp_root
         img_build = CONF.image_build_dir
-        utils.copy_file(CONF.pxelinux, tftp_root)
-        utils.copy_file(os.path.join(img_build, CONF.kernel), tftp_root)
-        utils.copy_file(os.path.join(img_build, CONF.ramdisk), tftp_root)
+
+        for paths in PXELINUX_PATH:
+            paths_flat = "', '".join(paths)
+            LOG.info("Looking for boot program files in '%s'", paths_flat)
+            for path in paths:
+                if not os.path.exists(path):
+                    LOG.info("File %s not found. Trying next paths option...",
+                             path)
+                    break
+            else:
+                LOG.info("Boot program files found in: '%s'", paths_flat)
+                for path in paths:
+                    utils.copy_file(path, tftp_root)
+                break
+        else:
+            raise exception.PXELinuxNotFound()
+
+        for img in (CONF.kernel, CONF.ramdisk):
+            utils.copy_file(os.path.join(img_build, img), tftp_root)
 
     def add_pxe_config_for_current_node(self):
         LOG.info("Setting up PXE configuration file for node {0}".format(

ramdisk_func_test/exception.py

@@ -79,3 +79,7 @@ class NonZeroCmdRetCode(RamDiskTestException):
 
 class VacantNetworkNotFound(RamDiskTestException):
     _msg = "Cannot find free libvirt net in %(head)s."
+
+
+class PXELinuxNotFound(RamDiskTestException):
+    _msg = "Network boot program files not found in any known location."