Adding a shell layer to find python version on the box

VMAccess/HandlerManifest.json

@@ -2,11 +2,11 @@
   {
     "version": 1.0,
     "handlerManifest": {
-      "disableCommand": "./vmaccess.py -disable",
-      "enableCommand": "./vmaccess.py -enable",
-      "installCommand": "./vmaccess.py -install",
-      "uninstallCommand": "./vmaccess.py -uninstall",
-      "updateCommand": "./vmaccess.py -update",
+      "disableCommand": "extension_shim.sh -c ./vmaccess.py -d",
+      "enableCommand": "extension_shim.sh -c ./vmaccess.py  -e",
+      "installCommand": "extension_shim.sh -c ./vmaccess.py  -i",
+      "uninstallCommand": "extension_shim.sh -c ./vmaccess.py -u",
+      "updateCommand": "extension_shim.sh -c ./vmaccess.py -p",
       "rebootAfterInstall": false,
       "reportHeartbeat": false
     }

VMAccess/extension_shim.sh

@@ -0,0 +1,114 @@
+#!/usr/bin/env bash
+
+# Keeping the default command
+COMMAND=""
+PYTHON=""
+
+USAGE="$(basename "$0") [-h] [-i|--install] [-u|--uninstall] [-d|--disable] [-e|--enable] [-p|--update]
+
+Program to find the installed python on the box and invoke a Python extension script.
+
+where:
+    -h|--help       show this help text
+    -i|--install    install the extension
+    -u|--uninstall  uninstall the extension
+    -d|--disable    disable the extension
+    -e|--enable     enable the extension
+    -p|--update     update the extension
+    -c|--command    command to run
+
+example:
+# Install usage
+$ bash extension_shim.sh -i
+python ./vmaccess.py -install
+
+# Custom executable python file
+$ bash extension_shim.sh -c ""hello.py"" -i
+python hello.py -install
+
+# Custom executable python file with arguments
+$ bash extension_shim.sh -c ""hello.py --install""
+python hello.py --install
+"
+
+function find_python(){
+    local python_exec_command=$1
+
+    # Check if there is python defined.
+    if command -v python >/dev/null 2>&1 ; then
+        eval ${python_exec_command}="python"
+    else
+        # Python was not found. Searching for Python3 now.
+        if command -v python >/dev/null 2>&1 ; then
+            eval ${python_exec_command}="python3"
+        fi
+    fi
+}
+
+# Transform long options to short ones for getopts support (getopts doesn't support long args)
+for arg in "$@"; do
+  shift
+  case "$arg" in
+    "--help")       set -- "$@" "-h" ;;
+    "--install")    set -- "$@" "-i" ;;
+    "--update")     set -- "$@" "-p" ;;
+    "--enable")     set -- "$@" "-e" ;;
+    "--disable")    set -- "$@" "-d" ;;
+    "--uninstall")  set -- "$@" "-u" ;;
+    *)              set -- "$@" "$arg"
+  esac
+done
+
+if [ -z "$arg" ]
+then
+   echo "$USAGE" >&2
+   exit 1
+fi
+
+# Get the arguments
+while getopts "iudephc:?" o; do
+    case "${o}" in
+        h|\?)
+            echo "$USAGE"
+            exit 0
+            ;;
+        i)
+            operation="-install"
+            ;;
+        u)
+            operation="-uninstall"
+            ;;
+        d)
+            operation="-disable"
+            ;;
+        e)
+            operation="-enable"
+            ;;
+        p)
+            operation="-update"
+            ;;
+        c)
+            COMMAND="$OPTARG"
+            ;;
+        *)
+            echo "$USAGE" >&2
+            exit 1
+            ;;
+    esac
+done
+
+shift $((OPTIND-1))
+
+# If find_python is not able to find a python installed, $PYTHON will be null.
+find_python PYTHON
+
+
+if [ -z "$PYTHON" ]; then
+   echo "No Python interpreter found on the box" >&2
+   exit 51 # Not Supported
+else
+    `${PYTHON} --version`
+fi
+
+${PYTHON} ${COMMAND} ${operation}
+# DONE

VMAccess/manifest.xml

@@ -2,7 +2,7 @@
 <ExtensionImage xmlns="http://schemas.microsoft.com/windowsazure">
   <ProviderNameSpace>Microsoft.OSTCExtensions</ProviderNameSpace>
   <Type>VMAccessForLinux</Type>
-  <Version>1.5.0</Version>
+  <Version>1.5.1</Version>
   <Label>Microsoft Azure VM Access Extension for Linux Virtual Machines</Label>
   <HostingResources>VmRole</HostingResources>
   <MediaLink></MediaLink>

VMAccess/vmaccess.py

@@ -100,13 +100,6 @@ def enable():
             hutil.log("Succeeded in reset sshd_config.")
 
         if remove_user:
-            if re.match("^[a-z][-a-z0-9_]*$", remove_user) is None:
-                waagent.AddExtensionEvent(name=hutil.get_name(),
-                                          op=waagent.WALAEventOperation.Enable,
-                                          isSuccess=False,
-                                          message="(03002)Argument error, invalid remove_user")
-                raise Exception("'remove_user' does not match the regular expression '^[a-z][-a-z0-9_]*$'")
-
             waagent.AddExtensionEvent(name=hutil.get_name(), op="scenario", isSuccess=True, message="remove-user")
             _remove_user_account(remove_user, hutil)
 
@@ -190,13 +183,6 @@ def _set_user_account_pub_key(protect_settings, hutil):
         return
 
     user_name = protect_settings['username']
-    if re.match("^[a-z][-a-z0-9_]*$", user_name) is None:
-        waagent.AddExtensionEvent(name=hutil.get_name(),
-                                  op=waagent.WALAEventOperation.Enable,
-                                  isSuccess=False,
-                                  message="(03002)Argument error, invalid username")
-        raise Exception("'username' does not match the regular expression '^[a-z][-a-z0-9_]*$'")
-
     user_pass = protect_settings.get('password')
     cert_txt = protect_settings.get('ssh_key')
     expiration = protect_settings.get('expiration')