Updated the 'update_repo.sh' script to hopefully act better during initial setup.

files/update_repo.sh

@@ -6,7 +6,7 @@
 # The command is called as follows:
 # update_repo.sh <destination path> <source repo> <source branch>
 
-# If REPO_ON_UPDATE is set, then that command will be executed whenever the repo is created and/or
+# If REPO_ON_UPDATE is set, then that file will be executed whenever the repo is created and/or
 # updated to a new revision. This can be used to trigger further processing of some sort, such as
 # compiling the contained source and/or restarting system services as appropriate.
 
@@ -58,6 +58,20 @@ then
     exit 2
 fi
 
+# Check if the REPO_ON_UPDATE script exists. If it doesn't (probably
+# because Puppet has not created it yet), then we don't want to run
+# yet. If we run without the script being present, then the script
+# will not be executed until the repository is updated, thus breaking
+# our promises.
+if [[ ! -z "$REPO_ON_UPDATE" ]]
+then
+    if [[ ! -f "$REPO_ON_UPDATE" ]]
+    then
+	echo "The script $REPO_ON_UPDATE does not exist."
+	exit 4
+    fi
+fi
+
 # Setup variables for calling "update_repo"...
 repo_path="$1"
 repo_source="$2"