test: add test-transaction-rollback-on-sigpipe.t demonstrating py3 regression
When an hg push is interrupted with C-c, the remote [hg serve] command
receives SIGPIPE.
If a pretxnchangegroup hook fails, the remote hg then tries to
rollback the transaction. It begins by printing "transaction
abort!\n". This returns EPIPE, but ui.py ignores that error.
In python3 (but not python2), this "transaction abort!\n" message
stays in a buffer, so future flushes of stderr will try to print the
message again, and so those flushes will also hit EPIPE.
This test demonstrates such a case where this EPIPE causes the
transaction rollback to fail, leaving behind an abandoned transaction.
Differential Revision: https://phab.mercurial-scm.org/D9151
#!/usr/bin/env python
# like ls -l, but do not print date, user, or non-common mode bit, to avoid
# using globs in tests.
from __future__ import absolute_import, print_function
import os
import stat
import sys
def modestr(st):
mode = st.st_mode
result = ''
if mode & stat.S_IFDIR:
result += 'd'
else:
result += '-'
for owner in ['USR', 'GRP', 'OTH']:
for action in ['R', 'W', 'X']:
if mode & getattr(stat, 'S_I%s%s' % (action, owner)):
result += action.lower()
else:
result += '-'
return result
def sizestr(st):
if st.st_mode & stat.S_IFREG:
return '%7d' % st.st_size
else:
# do not show size for non regular files
return ' ' * 7
os.chdir((sys.argv[1:] + ['.'])[0])
for name in sorted(os.listdir('.')):
st = os.stat(name)
print('%s %s %s' % (modestr(st), sizestr(st), name))