X-Git-Url: https://arthur.barton.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=main.py;h=7f632beaa997f0a7dd6bbff8066f32f4b80dff96;hb=aab82669cb0efd0a275e0ccd14ee779e894455ea;hp=19675cd109e897e31fd718452ce21e3dc1e9daab;hpb=40642ff27e4c9860d34c713b4388ee98d62b2f52;p=bup.git

diff --git a/main.py b/main.py
index 19675cd..7f632be 100755
--- a/main.py
+++ b/main.py
@@ -5,9 +5,15 @@ exec "$bup_python" "$0" ${1+"$@"}
 """
 # end of bup preamble
 
-from __future__ import absolute_import
+from __future__ import absolute_import, print_function
 import errno, re, sys, os, subprocess, signal, getopt
 
+if sys.version_info[0] != 2 \
+   and not os.environ.get('BUP_ALLOW_UNEXPECTED_PYTHON_VERSION') == 'true':
+    print('error: bup may crash with python versions other than 2, or eat your data',
+          file=sys.stderr)
+    sys.exit(2)
+
 from subprocess import PIPE
 from sys import stderr, stdout
 import select
@@ -198,16 +204,15 @@ def filter_output(src_out, src_err, dest_out, dest_err):
                     print_clean_line(dest, pending.pop(fd, []), width)
                 else:
                     split = sep_rx.split(buf)
-                    if len(split) > 2:
-                        while len(split) > 1:
-                            content, sep = split[:2]
-                            split = split[2:]
-                            print_clean_line(dest,
-                                             pending.pop(fd, []) + [content],
-                                             width,
-                                             sep)
-                    else:
-                        assert(len(split) == 1)
+                    while len(split) > 1:
+                        content, sep = split[:2]
+                        split = split[2:]
+                        print_clean_line(dest,
+                                         pending.pop(fd, []) + [content],
+                                         width,
+                                         sep)
+                    assert(len(split) == 1)
+                    if split[0]:
                         pending.setdefault(fd, []).extend(split)
     except BaseException as ex:
         pending_ex = chain_ex(add_ex_tb(ex), pending_ex)