VMware: Support parsing DEFAULT-RUN-POST-CUST-SCRIPT (#441)

Add support for VMware's vCD configuration setting DEFAULT-RUN-POST-CUST-SCRIPT.
When set True, it will default vms to run post customization scripts if the VM has not been configured in VMTools with "enable-custom-scripts" set False.

Add datasource documentation with a bit more context about this interaction on VMware products.

With this fix, the behavior will be:
 * If VM administrator doesn't want others to execute a script on this VM,  VMtools can set "enable-custom-scripts" to false from the utility "vmware-toolbox-cmd".
 * If VM administrator doesn't set value to "enable-custom-scripts", then by default this script is disabled for security purpose.
 * For VMware's vCD product , the preference is to enable the script if "enable-custom-scripts" is not set. vCD will generate a configuration file with "DEFAULT-RUN-POST-CUST-SCRIPT" set to true. This flag works for both VMware customization engine and cloud-init.

2 files changed, 34 insertions, 8 deletions

diff --git a/cloudinit/sources/DataSourceOVF.py b/cloudinit/sources/DataSourceOVF.py
index 4c5eee4f..e53d2eb1 100644
--- a/cloudinit/sources/DataSourceOVF.py
+++ b/cloudinit/sources/DataSourceOVF.py
@@ -152,14 +152,25 @@ class DataSourceOVF(sources.DataSource):
                     product_marker, os.path.join(self.paths.cloud_dir, 'data'))
                 special_customization = product_marker and not hasmarkerfile
                 customscript = self._vmware_cust_conf.custom_script_name
-                custScriptConfig = get_tools_config(
-                    CONFGROUPNAME_GUESTCUSTOMIZATION,
-                    GUESTCUSTOMIZATION_ENABLE_CUST_SCRIPTS,
-                    "false")
-                if custScriptConfig.lower() != "true":
-                    # Update the customization status if there is a
-                    # custom script is disabled
-                    if special_customization and customscript:
+
+                # In case there is a custom script, check whether VMware
+                # Tools configuration allow the custom script to run.
+                if special_customization and customscript:
+                    defVal = "false"
+                    if self._vmware_cust_conf.default_run_post_script:
+                        LOG.debug(
+                            "Set default value to true due to"
+                            " customization configuration."
+                        )
+                        defVal = "true"
+
+                    custScriptConfig = get_tools_config(
+                        CONFGROUPNAME_GUESTCUSTOMIZATION,
+                        GUESTCUSTOMIZATION_ENABLE_CUST_SCRIPTS,
+                        defVal)
+                    if custScriptConfig.lower() != "true":
+                        # Update the customization status if custom script
+                        # is disabled
                         msg = "Custom script is disabled by VM Administrator"
                         LOG.debug(msg)
                         set_customization_status(
diff --git a/cloudinit/sources/helpers/vmware/imc/config.py b/cloudinit/sources/helpers/vmware/imc/config.py
index f2a81416..7109aef3 100644
--- a/cloudinit/sources/helpers/vmware/imc/config.py
+++ b/cloudinit/sources/helpers/vmware/imc/config.py
@@ -26,6 +26,7 @@ class Config(object):
     TIMEZONE = 'DATETIME|TIMEZONE'
     UTC = 'DATETIME|UTC'
     POST_GC_STATUS = 'MISC|POST-GC-STATUS'
+    DEFAULT_RUN_POST_SCRIPT = 'MISC|DEFAULT-RUN-POST-CUST-SCRIPT'
 
     def __init__(self, configFile):
         self._configFile = configFile
@@ -115,4 +116,18 @@ class Config(object):
             raise ValueError('PostGcStatus value should be yes/no')
         return postGcStatus == 'yes'
 
+    @property
+    def default_run_post_script(self):
+        """
+        Return enable-custom-scripts default value if enable-custom-scripts
+        is absent in VM Tools configuration
+        """
+        defaultRunPostScript = self._configFile.get(
+            Config.DEFAULT_RUN_POST_SCRIPT,
+            'no')
+        defaultRunPostScript = defaultRunPostScript.lower()
+        if defaultRunPostScript not in ('yes', 'no'):
+            raise ValueError('defaultRunPostScript value should be yes/no')
+        return defaultRunPostScript == 'yes'
+
 # vi: ts=4 expandtab