##### 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

" export environment variable like 'export VMWARE_USER=ESXI_USERNAME'")
    if not password:
        module.fail_json(msg="Password parameter is missing."
                             " Please specify this parameter in task or"
                             " export environment variable like 'export VMWARE_PASSWORD=ESXI_PASSWORD'")
    if validate_certs and not hasattr(ssl, 'SSLContext'):
        module.fail_json(msg='pyVim does not support changing verification mode with python < 2.7.9. Either update '
                             'python or use validate_certs=false.')
    ssl_context = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
    if validate_certs:
        ssl_context.verify_mode = ssl.CERT_REQUIRED
        ssl_context.check_hostname = True
        ssl_context.load_default_certs()
    service_instance = None
    proxy_host = module.params.get('proxy_host')
    proxy_port = module.params.get('proxy_port')
    connect_args = dict(
        host=hostname,
        port=port,
    )
    if ssl_context:
        connect_args.update(sslContext=ssl_context)
    msg_suffix = ''
    try:
        if proxy_host:
            msg_suffix = " [proxy: %s:%d]" % (proxy_host, proxy_port)
            connect_args.update(httpProxyHost=proxy_host, httpProxyPort=proxy_port)
            smart_stub = connect.SmartStubAdapter(**connect_args)
            session_stub = connect.VimSessionOrientedStub(smart_stub, connect.VimSessionOrientedStub.makeUserLoginMethod(username, password))
            service_instance = vim.ServiceInstance('ServiceInstance', session_stub)