+### handling breakpoints in the startup process
+import select, sys, string
+
+### global debug settings
+# NOTE. when BREAKPOINT_MODE turns out enabled,
+# you have to attend the boot phase, that would hang otherwise
+
+# enabling this will cause the node to ask for breakpoint-mode at startup
+# production code should read False/False
+PROMPT_MODE=False
+# default for when prompt is turned off, or it's on but the timeout triggers
+BREAKPOINT_MODE=False
+VERBOSE_MODE=False
+VERBOSE_MODE=True
+# in seconds : if no input, proceed
+PROMPT_TIMEOUT=5
+
+def prompt_for_breakpoint_mode ():
+
+ global BREAKPOINT_MODE
+ if PROMPT_MODE:
+ default_answer=BREAKPOINT_MODE
+ answer=''
+ if BREAKPOINT_MODE:
+ display="[y]/n"
+ else:
+ display="y/[n]"
+ sys.stdout.write ("Want to run in breakpoint mode ? %s "%display)
+ sys.stdout.flush()
+ r,w,e = select.select ([sys.stdin],[],[],PROMPT_TIMEOUT)
+ if r:
+ answer = string.strip(sys.stdin.readline())
+ else:
+ sys.stdout.write("\nTimed-out (%d s)"%PROMPT_TIMEOUT)
+ if answer:
+ BREAKPOINT_MODE = ( answer == "y" or answer == "Y")
+ else:
+ BREAKPOINT_MODE = default_answer
+ label="Off"
+ if BREAKPOINT_MODE:
+ label="On"
+ sys.stdout.write("\nCurrent BREAKPOINT_MODE is %s\n"%label)
+
+def breakpoint (message, cmd = None):
+
+ if BREAKPOINT_MODE:
+
+ if cmd is None:
+ cmd="/bin/sh"
+ message=message+" -- Entering bash - type ^D to proceed"
+
+ print message
+ os.system(cmd)
+
+
+########################################