Handle unformatted/corrupted partition tables, see SWL-3246

- handle more pyparted exceptions
- properly clobber the disk signature

packages/base/all/vendor-config-onl/src/python/onl/install/BaseInstall.py

@@ -21,6 +21,14 @@ from InstallUtils import ProcMountsParser
 import onl.YamlUtils
 from onl.sysconfig import sysconfig
 
+try:
+    PartedException = parted._ped.PartedException
+    DiskException = parted._ped.DiskException
+except AttributeError:
+    import _ped
+    PartedException = _ped.PartedException
+    DiskException = _ped.DiskException
+
 class Base:
 
     class installmeta:
@@ -686,11 +694,17 @@ class UbootInstaller(SubprocessMixin, Base):
                 return 0
             self.log.warn("disk %s has wrong label %s",
                           self.device, self.partedDisk.type)
-        except Exception as ex:
+        except (DiskException, PartedException) as ex:
             self.log.error("cannot get partition table from %s: %s",
                            self.device, str(ex))
+        except Exception as ex:
+            self.log.exception("cannot get partition table from %s: %s",
+                               self.device)
 
-        self.log.info("creating msdos label on %s")
+        self.log.info("clobbering disk label on %s", self.device)
+        self.partedDevice.clobber()
+
+        self.log.info("creating msdos label on %s", self.device)
         self.partedDisk = parted.freshDisk(self.partedDevice, 'msdos')
 
         return 0