##### SUMMARY

The following snippet from https://github.com/ansible/ansible/blob/devel/test/integration/targets/vmware_guest/tasks/create_d1_c1_f0.yml uses `autoselect_datastore: True`.

```yaml
- name: create new VMs
  vmware_guest:
    validate_certs: False
    hostname: "{{ vcenter_hostname }}"
    username: "{{ vcenter_username }}"
    password: "{{ vcenter_password }}"
    name: newvm_1
    #template: "{{ item|basename }}"
    guest_id: centos64Guest
    datacenter: "{{ dc1 }}"
    hardware:
        num_cpus: 1
        num_cpu_cores_per_socket: 1
        memory_mb: 256
        hotadd_memory: true
        hotadd_cpu: false
        max_connections: 10
    disk:
        - size: 1gb
          type: thin
          autoselect_datastore: True
    state: poweredoff
    folder: F0
```

One of my two datastores is dedicated to the ISO image and so, is readOnly. But it still get selected consistently. I use the following hack to avoid the problem:

```diff
diff --git a/lib/ansible/modules/cloud/vmware/vmware_guest.py b/lib/ansible/modules/cloud/vmware/vmware_guest.py
index 6a63e97798..3648e3e87f 100644
--- a/lib/ansible/modules/cloud/vmware/vmware_guest.py
+++ b/lib/ansible/modules/cloud/vmware/vmware_guest.py
@@ -1925,6 +1925,15 @@ class PyVmomiHelper(PyVmomi):
 
                 datastore_freespace = 0
                 for ds in datastores:
+                    is_readonly = False
+                    for h in ds.host:
+                        if h.mountInfo.accessMode == 'readOnly':
+                            is_readonly = True
+                            break
+
+                    if is_readonly:
+                        continue
+
                     if (ds.summary.freeSpace > datastore_freespace) or (ds.summary.freeSpace == datastore_freespace and not datastore):
                         # If datastore field is provided, filter destination datastores
                         if 'datastore' in self.params['disk'][0] and \
```
<!--- Explain the problem briefly below -->

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
<!--- Write the short name of the module, plugin, task or feature below, use your best guess if unsure -->

vmware_guest

pg_obj = find_dvspg_by_name(dvs_obj, network_name)
                    if pg_obj is None:
                        self.module.fail_json(msg="Unable to find distributed port group %s" % network_name)
                else:
                    pg_obj = self.cache.find_obj(self.content, [vim.dvs.DistributedVirtualPortgroup], network_name)
                
                
                if not pg_obj.config.distributedVirtualSwitch:
                    self.module.fail_json(msg="Failed to find distributed virtual switch which is associated with"
                                              " distributed virtual portgroup '%s'. Make sure hostsystem is associated with"
                                              " the given distributed virtual portgroup. Also, check if user has correct"
                                              " permission to access distributed virtual switch in the given portgroup." % pg_obj.name)
                if (nic.device.backing and
                    (not hasattr(nic.device.backing, 'port') or
                     (nic.device.backing.port.portgroupKey != pg_obj.key or
                      nic.device.backing.port.switchUuid != pg_obj.config.distributedVirtualSwitch.uuid))):
                    nic_change_detected = True
                dvs_port_connection = vim.dvs.PortConnection()
                dvs_port_connection.portgroupKey = pg_obj.key
                
                
                
                host_system = self.params.get('esxi_hostname')
                if host_system and host_system not in [host.config.host.name for host in pg_obj.config.distributedVirtualSwitch.config.host]:
                    self.module.fail_json(msg="It seems that host system '%s' is not associated with distributed"
                                              " virtual portgroup '%s'. Please make sure host system is associated"
                                              " with given distributed virtual portgroup" % (host_system, pg_obj.name))
                dvs_port_connection.switchUuid = pg_obj.config.distributedVirtualSwitch.uuid
                nic.device.backing = vim.vm.device.VirtualEthernetCard.DistributedVirtualPortBackingInfo()
                nic.device.backing.port = dvs_port_connection