fail early when profile does not exist (#300)

dotdrop/dotdrop.py

@@ -419,6 +419,10 @@ def cmd_update(o):
     paths = o.update_path
     iskey = o.update_iskey
 
+    if o.profile not in [p.key for p in o.profiles]:
+        LOG.err('no such profile \"{}\"'.format(o.profile))
+        return False
+
     adapt_workers(o, LOG)
 
     if not paths:

dotdrop/updater.py

@@ -95,6 +95,16 @@ class Updater:
         dtpath = os.path.join(self.dotpath, dotfile.src)
         dtpath = os.path.expanduser(dtpath)
 
+        if not os.path.exists(path):
+            msg = '\"{}\" does not exist'
+            self.log.err(msg.format(path))
+            return False
+
+        if not os.path.exists(dtpath):
+            msg = '\"{}\" does not exist, import it first'
+            self.log.err(msg.format(dtpath))
+            return False
+
         if self._ignore([path, dtpath]):
             self.log.sub('\"{}\" ignored'.format(dotfile.key))
             return True