Fix legacy scp mode in version check script

.gitignore

@@ -12,3 +12,4 @@ projects.json
 /scripts/.settings
 /fpga-elphel
 !/fpga-elphel/eclipse_workspace_setup
+__pycache__/

check_versions.py

@@ -65,8 +65,14 @@ def get_versions_from_target_quick(addr,tdir):
   ldir = os.path.basename(tdir)
   if os.path.isdir(ldir):
     shout("rm -rf "+ldir)
-    
-  shout("scp -r "+addr+":"+tdir+" .")
+
+  scp_src = addr+":"+tdir
+  scp_cmd_legacy = "scp -O -r "+scp_src+" ."
+  scp_ret = subprocess.call(scp_cmd_legacy,shell=True)
+  if scp_ret != 0:
+    raise Exception("Failed to copy versions from target via scp -O. Check ssh/scp access to "+addr)
+  if not os.path.isdir(ldir):
+    raise Exception("Failed to read target versions: local directory '"+ldir+"' was not created")
   
   remote_list = []
 
@@ -230,5 +236,3 @@ local_list = sorted(local_list, key=lambda x: x[0])
 #print(local_list)
 
 deep_analysis(local_list,target_list)
-
-