Fix: sbd: Ask if overwrite when given sbd device on interactive mode(…

…bsc#1201428)

** Problem
When sbd device already created, running `crm cluster init -s
<sbd_device>`, that's on the interactive mode, but the existing sbd
device will be overwritten

** Solution
Check if the given sbd device already initialized, if on the interactive
mode, ask user if overwrite, input 'n', no overwrite for sbd device

crmsh/bootstrap.py

@@ -357,7 +357,8 @@ def __init__(self, sbd_devices=None, diskless_sbd=False):
         self.diskless_sbd = diskless_sbd
         self._sbd_devices = None
         self._watchdog_inst = None
-        self.no_overwrite = False
+        self.no_overwrite_map = {}
+        self.no_update_config = False
 
     def _parse_sbd_device(self):
         """
@@ -411,6 +412,12 @@ def _verify_sbd_device(self, dev_list, compare_node_list=[]):
                 raise ValueError("{} doesn't look like a block device".format(dev))
             self._compare_device_uuid(dev, compare_node_list)
 
+    def _no_overwrite_check(self, dev):
+        """
+        Check if device already initialized and if need to overwrite
+        """
+        return SBDManager.has_sbd_device_already_initialized(dev) and not confirm("SBD is already configured to use {} - overwrite?".format(dev))
+
     def _get_sbd_device_interactive(self):
         """
         Get sbd device on interactive mode
@@ -426,8 +433,10 @@ def _get_sbd_device_interactive(self):
             return
 
         configured_dev_list = self._get_sbd_device_from_config()
-        if configured_dev_list and not confirm("SBD is already configured to use {} - overwrite?".format(';'.join(configured_dev_list))):
-            self.no_overwrite = True
+        for dev in configured_dev_list:
+            self.no_overwrite_map[dev] = self._no_overwrite_check(dev)
+        if self.no_overwrite_map and all(self.no_overwrite_map.values()):
+            self.no_update_config = True
             return configured_dev_list
 
         dev_list = []
@@ -439,14 +448,22 @@ def _get_sbd_device_interactive(self):
             if dev == "none":
                 self.diskless_sbd = True
                 return
+
             dev_list = utils.re_split_string(self.PARSE_RE, dev)
             try:
                 self._verify_sbd_device(dev_list)
             except ValueError as err_msg:
                 print_error_msg(str(err_msg))
                 continue
-            for dev_item in dev_list:
-                warn("All data on {} will be destroyed!".format(dev_item))
+
+            for dev in dev_list:
+                if dev not in self.no_overwrite_map:
+                    self.no_overwrite_map[dev] = self._no_overwrite_check(dev)
+                if self.no_overwrite_map[dev]:
+                    if dev == dev_list[-1]:
+                        return dev_list
+                    continue
+                warn("All data on {} will be destroyed!".format(dev))
                 if confirm('Are you sure you wish to use this device?'):
                     dev_looks_sane = True
                 else:
@@ -463,6 +480,10 @@ def _get_sbd_device(self):
         if self.sbd_devices_input:
             dev_list = self._parse_sbd_device()
             self._verify_sbd_device(dev_list)
+            for dev in dev_list:
+                self.no_overwrite_map[dev] = self._no_overwrite_check(dev)
+            if all(self.no_overwrite_map.values()) and dev_list == self._get_sbd_device_from_config():
+                self.no_update_config = True
         elif not self.diskless_sbd:
             dev_list = self._get_sbd_device_interactive()
         self._sbd_devices = dev_list
@@ -474,7 +495,7 @@ def _initialize_sbd(self):
         if self.diskless_sbd:
             return
         for dev in self._sbd_devices:
-            if self.no_overwrite and SBDManager.has_sbd_device_already_initialized(dev):
+            if dev in self.no_overwrite_map and self.no_overwrite_map[dev]:
                 continue
             rc, _, err = invoke("sbd -d {} create".format(dev))
             if not rc:
@@ -484,7 +505,7 @@ def _update_configuration(self):
         """
         Update /etc/sysconfig/sbd
         """
-        if self.no_overwrite:
+        if self.no_update_config:
             csync2_update(SYSCONFIG_SBD)
             return
 
@@ -509,7 +530,7 @@ def _get_sbd_device_from_config(self):
         if res:
             return utils.re_split_string(self.PARSE_RE, res)
         else:
-            return None
+            return []
 
     def sbd_init(self):
         """
@@ -530,7 +551,7 @@ def sbd_init(self):
         if self.diskless_sbd:
             warn(self.DISKLESS_SBD_WARNING)
             msg = "Configuring diskless SBD"
-        elif not self.no_overwrite:
+        elif not all(self.no_overwrite_map.values()):
             msg = "Initializing SBD"
         with status_long(msg):
             self._initialize_sbd()