Drive scan from SCM repos.

- reduces repetition in the config XML.

git_catalog_repository.py

@@ -1,40 +1,50 @@
 # git diff --quiet e5f841bc84d31fee339191a59b8746cb4eb8074c -- ./Aircraft/
- 
+
 import subprocess
-import os
+import os, sgprops
 
 class GITCatalogRepository:
-    def __init__(self, path, usesSubmodules = False, singleAircraft = False):
-        self._path = path
-        
-        if not os.path.exists(os.path.join(path, ".git")):
-            raise RuntimeError("not a Git directory:" + path)
-        
-        self._usesSubmodules = usesSubmodules
+    def __init__(self, node, singleAircraft = False):
+        self._path = node.getValue("path")
+
+        if not os.path.exists(os.path.join(self._path , ".git")):
+            raise RuntimeError("not a Git directory:" + self._path )
+
+        self._usesSubmodules = node.getValue("uses-submodules", False)
         self._singleAircraft = singleAircraft
-        
-        self._currentRevision = subprocess.catch_output(["git", "rev-parse", "HEAD"],
+
+        self._currentRevision = subprocess.check_output(["git", "rev-parse", "HEAD"],
             cwd = self._path)
 
+        self._aircraftPath = None
+        if node.hasChild("scan-suffix"):
+            self._aircraftPath = os.path.join(path, node.getValue("scan-suffix"))
+
+    @property
+    def path(self):
+        return self._path
+
+    @property
+    def aircraftPath(self):
+        return self._aircraftPath
+
     def hasPathChanged(self, path, oldRev):
         diffArgs = ["git", "diff", "--quiet", oldRev, "--"]
         if not (self._usesSubmodules and self._singleAircraft):
             diffArgs.append(path)
-            
+
         return subprocess.call(diffArgs, cwd = self._path)
 
     def update(self):
         subprocess.call(["git", "pull"])
-        self._currentRevision = subprocess.catch_output(["git", "rev-parse", "HEAD"],
+        self._currentRevision = subprocess.check_output(["git", "rev-parse", "HEAD"],
                 cwd = self._path)
-        
+
         if self._usesSubmodules:
-            subprocess.call(["git", "submodule", "update"], cwd = self._path)    
+            subprocess.call(["git", "submodule", "update"], cwd = self._path)
 
     def scmRevisionForPath(self, path):
         if self._usesSubmodules:
-            return subprocess.catch_output(["git", "rev-parse", "HEAD"], cwd = self._path)
-            
-        return self._currentRevision
+            return subprocess.check_output(["git", "rev-parse", "HEAD"], cwd = self._path)
 
- 
+        return self._currentRevision