2 from __future__ import absolute_import, print_function
3 from array import array
4 from traceback import print_exception
7 # Please see CODINGSTYLE for important exception handling guidelines
8 # and the rationale behind add_ex_tb(), add_ex_ctx(), etc.
10 py_maj = sys.version_info[0]
15 from os import environb as environ
17 lc_ctype = environ.get(b'LC_CTYPE')
18 if lc_ctype and lc_ctype.lower() != b'iso-8859-1':
19 # Because of argv, options.py, pwd, grp, and any number of other issues
20 print('error: bup currently only works with ISO-8859-1, not LC_CTYPE=%s'
23 print('error: this should already have been arranged, so indicates a bug',
27 from os import fsencode
28 from shlex import quote
34 """Do nothing (already handled by Python 3 infrastructure)."""
37 def add_ex_ctx(ex, context_ex):
38 """Do nothing (already handled by Python 3 infrastructure)."""
45 """Return the original bytes passed to main() for an argv argument."""
48 def bytes_from_uint(i):
51 byte_int = lambda x: x
53 def buffer(object, offset=None, size=None):
55 assert offset is not None
56 return memoryview(object)[offset:offset + size]
58 return memoryview(object)[offset:]
59 return memoryview(object)
61 def join_bytes(*items):
62 """Return the concatenated bytes or memoryview arguments as bytes."""
63 return b''.join(items)
70 from pipes import quote
71 from os import environ
74 int_types = (int, long)
77 """Add a traceback to ex if it doesn't already have one. Return ex.
80 if not getattr(ex, '__traceback__', None):
81 ex.__traceback__ = sys.exc_info()[2]
84 def add_ex_ctx(ex, context_ex):
85 """Make context_ex the __context__ of ex (unless it already has one).
90 if not getattr(ex, '__context__', None):
91 ex.__context__ = context_ex
94 def dump_traceback(ex):
96 next_ex = getattr(ex, '__context__', None)
99 next_ex = getattr(next_ex, '__context__', None)
100 stack = reversed(stack)
102 tb = getattr(ex, '__traceback__', None)
103 print_exception(type(ex), ex, tb)
105 print('\nDuring handling of the above exception, another exception occurred:\n',
107 tb = getattr(ex, '__traceback__', None)
108 print_exception(type(ex), ex, tb)
114 """Return the original bytes passed to main() for an argv argument."""
117 def bytes_from_uint(i):
124 def join_bytes(x, y):
125 """Return the concatenated bytes or buffer arguments as bytes."""
126 if type(x) == buffer:
127 assert type(y) in (bytes, buffer)
129 assert type(x) == bytes
131 return b''.join((x, y))
132 assert type(y) in (bytes, buffer)
136 """Run main() and raise a SystemExit with the return value if it
137 returns, pass along any SystemExit it raises, convert
138 KeyboardInterrupts into exit(130), and print a Python 3 style
139 contextual backtrace for other exceptions in both Python 2 and
143 except KeyboardInterrupt as ex:
145 except SystemExit as ex:
147 except BaseException as ex:
155 # Excepting wrap_main() in the traceback, these should produce similar output:
156 # python2 lib/bup/compat.py
157 # python3 lib/bup/compat.py
159 # diff -u <(python2 lib/bup/compat.py 2>&1) <(python3 lib/bup/compat.py 2>&1)
161 # Though the python3 output for 'second' will include a stacktrace
162 # starting from wrap_main, rather than from outer().
164 if __name__ == '__main__':
167 raise Exception('first')
172 except Exception as ex:
175 raise Exception('second')
176 except Exception as ex2:
177 raise add_ex_ctx(add_ex_tb(ex2), ex)