Fix hooks path for all actions

Insert the hooks directory at the beginning of sys.path in order to
make it take precedence over other entries, e.g. in the face of
conflicting charmhelpers packages.

Change-Id: I11e870fff3d590d2ac491292f3f2c68d84a67181
Closes-Bug: 1834254

actions/hugepagereport.py

@@ -14,9 +14,19 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
 import sys
 
-sys.path.append('hooks')
+_path = os.path.dirname(os.path.realpath(__file__))
+_hooks = os.path.abspath(os.path.join(_path, '../hooks'))
+
+
+def _add_path(path):
+    if path not in sys.path:
+        sys.path.insert(1, path)
+
+_add_path(_hooks)
+
 
 import subprocess
 from charmhelpers.core import hookenv

actions/openstack_upgrade.py

@@ -14,9 +14,20 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
 import sys
 
-sys.path.append('hooks/')
+
+_path = os.path.dirname(os.path.realpath(__file__))
+_hooks = os.path.abspath(os.path.join(_path, '../hooks'))
+
+
+def _add_path(path):
+    if path not in sys.path:
+        sys.path.insert(1, path)
+
+_add_path(_hooks)
+
 
 from charmhelpers.contrib.openstack.utils import (
     do_action_openstack_upgrade,

actions/pause_resume.py

@@ -17,7 +17,16 @@
 import os
 import sys
 
-sys.path.append('hooks')
+_path = os.path.dirname(os.path.realpath(__file__))
+_hooks = os.path.abspath(os.path.join(_path, '../hooks'))
+
+
+def _add_path(path):
+    if path not in sys.path:
+        sys.path.insert(1, path)
+
+_add_path(_hooks)
+
 
 from charmhelpers.core.hookenv import action_fail
 from nova_compute_utils import (

actions/security_checklist.py

@@ -17,7 +17,17 @@ import configparser
 import os
 import sys
 
-sys.path.append('hooks')
+
+_path = os.path.dirname(os.path.realpath(__file__))
+_hooks = os.path.abspath(os.path.join(_path, '../hooks'))
+
+
+def _add_path(path):
+    if path not in sys.path:
+        sys.path.insert(1, path)
+
+_add_path(_hooks)
+
 
 import charmhelpers.contrib.openstack.audits as audits
 from charmhelpers.contrib.openstack.audits import (