Print a more helpful message if we get an error while attempting to read

an old current_mirror marker.


git-svn-id: http://svn.savannah.nongnu.org/svn/rdiff-backup@980 2b77aa54-bcbc-44c9-a7ec-4f6cf2b41109

trunk/rdiff-backup/CHANGELOG

 New in v1.2.3 (????/??/??)
 ---------------------------
 
+Print a more helpful error message if we get an error while reading an old
+current_mirror marker. This can happen because it has been locked or deleted
+by a just-finished rdiff-backup process. Closes Ubuntu bugs #88140 and
+#284506. (Andrew Ferguson)
+
 Do not backup reparse points on native Windows. Thanks to John Covici for
 reporting the issue. (Andrew Ferguson)
 

trunk/rdiff-backup/rdiff_backup/Main.py

@@ -424,7 +424,10 @@ def fix_failed_initial_backup():
 def backup_set_rbdir(rpin, rpout):
 	"""Initialize data dir and logging"""
 	global incdir
+	try:
 		incdir = Globals.rbdir.append_path("increments")
+	except (OSError, IOError), exc:
+		Log.FatalError("Could not begin backup due to\n%s" % exc)
 
 	assert rpout.lstat(), (rpout.path, rpout.lstat())
 	if rpout.isdir() and not rpout.listdir(): # rpout is empty dir
@@ -543,7 +546,11 @@ def Restore(src_rp, dest_rp, restore_as_of = None):
 		Log.FatalError("Could not find rdiff-backup repository at "
 					   + src_rp.path)
 	restore_check_paths(src_rp, dest_rp, restore_as_of)
+	try:
 		dest_rp.conn.fs_abilities.restore_set_globals(dest_rp)
+	except (OSError, IOError), exc:
+		print "\n"
+		Log.FatalError("Could not begin backup due to\n%s" % exc)
 	init_user_group_mapping(dest_rp.conn)
 	src_rp = restore_init_quoting(src_rp)
 	restore_check_backup_dir(restore_root, src_rp, restore_as_of)
@@ -710,7 +717,7 @@ def require_root_set(rp, read_only):
 	try:
 		Globals.rbdir.conn.fs_abilities.single_set_globals(Globals.rbdir,
 														   read_only)
-	except IOError, exc:
+	except (OSError, IOError), exc:
 		print("\n")
 		Log.FatalError("Could not open rdiff-backup directory\n\n%s\n\n"
 					   "due to\n\n%s" % (Globals.rbdir.path, exc))
@@ -876,7 +883,12 @@ information in it.
 """ % (Globals.rbdir.path,))
 	elif len(curmir_incs) == 1: return 0
 	else:
-		if not force: curmir_incs[0].conn.regress.check_pids(curmir_incs)
+		if not force:
+			try:
+				curmir_incs[0].conn.regress.check_pids(curmir_incs)
+			except (OSError, IOError), exc:
+				Log.FatalError("Could not check if rdiff-backup is currently"
+							   "running due to\n%s" % exc)
 		assert len(curmir_incs) == 2, "Found too many current_mirror incs!"
 		return 1