Be able to turn off strict host checking.

util/vpc-tools/vpc-tools.py

 """VPC Tools.
 
 Usage:
-    vpc-tools.py ssh-config vpc <vpc_id> identity-file <identity_file> user <user> [config-file <config_file>]
+    vpc-tools.py ssh-config vpc <vpc_id> identity-file <identity_file> user <user> [config-file <config_file>] [strict-host-check <strict_host_check>]
     vpc-tools.py (-h --help)
     vpc-tools.py (-v --version)
 
@@ -16,6 +16,7 @@ from docopt import docopt
 
 VERSION="vpc tools 0.1"
 DEFAULT_USER="ubuntu"
+DEFAULT_HOST_CHECK="yes"
 
 JUMPBOX_CONFIG = """
     Host {jump_box}
@@ -23,6 +24,7 @@ JUMPBOX_CONFIG = """
       IdentityFile {identity_file}
       ForwardAgent yes
       User {user}
+      StrictHostKeyChecking {strict_host_check}
     """
 
 HOST_CONFIG = """
@@ -32,6 +34,7 @@ HOST_CONFIG = """
       IdentityFile {identity_file}
       ForwardAgent yes
       User {user}
+      StrictHostKeyChecking {strict_host_check}
     """
 
 
@@ -48,10 +51,14 @@ def _ssh_config(args):
     user = args.get("<user>")
     vpc_id = args.get("<vpc_id>")
     config_file = args.get("<config_file>")
+    strict_host_check = args.get("<strict_host_check>")
 
     if not user:
       user = DEFAULT_USER
 
+    if not strict_host_check:
+      strict_host_check = DEFAULT_HOST_CHECK
+
     if config_file:
       config_file = "-F {}".format(config_file)
     else:
@@ -73,7 +80,8 @@ def _ssh_config(args):
                     jump_box=jump_box,
                     ip=instance.ip_address,
                     user=user,
-                    identity_file=identity_file)
+                    identity_file=identity_file,
+                    strict_host_check=strict_host_check)
 
             else:
                 print HOST_CONFIG.format(
@@ -84,7 +92,8 @@ def _ssh_config(args):
                     user=user,
                     logical_id=logical_id,
                     identity_file=identity_file,
-                    config_file=config_file)
+                    config_file=config_file,
+                    strict_host_check=strict_host_check)
 
             #duplicating for convenience with ansible
             name = friendly.format(vpc_id=vpc_id,
@@ -98,7 +107,8 @@ def _ssh_config(args):
                 user=user,
                 logical_id=logical_id,
                 identity_file=identity_file,
-                config_file=config_file)
+                config_file=config_file,
+                strict_host_check=strict_host_check)
 
 
 if __name__ == '__main__':