procutil: make stream detection in make_line_buffered more correct and strict
In make_line_buffered(), we don’t want to wrap the stream if we know that lines
get flushed to the underlying raw stream already.
Previously, the heuristic was too optimistic. It assumed that any stream which
is not an instance of io.BufferedIOBase doesn’t need wrapping. However, there
are buffered streams that aren’t instances of io.BufferedIOBase, like
Mercurial’s own winstdout.
The new logic is different in two ways:
First, only for the check, if unwraps any combination of WriteAllWrapper and
winstdout.
Second, it skips wrapping the stream only if it is an instance of io.RawIOBase
(or already wrapped). If it is an instance of io.BufferedIOBase, it gets
wrapped. In any other case, the function raises an exception. This ensures
that, if an unknown stream is passed or we add another wrapper in the future,
we don’t wrap the stream if it’s already line buffered or not wrap the stream
if it’s not line buffered. In fact, this was already helpful during development
of this change. Without it, I possibly would have forgot that WriteAllWrapper
needs to be ignored for the check, leading to unnecessary wrapping if stdout is
unbuffered.
The alternative would have been to always wrap unknown streams. However, I
don’t think that anyone would benefit from being less strict. We can expect
streams from the standard library to be subclassing either io.RawIOBase or
io.BufferedIOBase, so running Mercurial in the standard way should not regress
by this change. Py2exe might replace sys.stdout and sys.stderr, but that
currently breaks Mercurial anyway and also these streams don’t claim to be
interactive, so this function is not called for them.
import array
import errno
import fcntl
import os
import sys
from .pycompat import getattr
from . import (
encoding,
pycompat,
util,
)
# BSD 'more' escapes ANSI color sequences by default. This can be disabled by
# $MORE variable, but there's no compatible option with Linux 'more'. Given
# OS X is widely used and most modern Unix systems would have 'less', setting
# 'less' as the default seems reasonable.
fallbackpager = b'less'
def _rcfiles(path):
rcs = [os.path.join(path, b'hgrc')]
rcdir = os.path.join(path, b'hgrc.d')
try:
rcs.extend(
[
os.path.join(rcdir, f)
for f, kind in sorted(util.listdir(rcdir))
if f.endswith(b".rc")
]
)
except OSError:
pass
return rcs
def systemrcpath():
path = []
if pycompat.sysplatform == b'plan9':
root = b'lib/mercurial'
else:
root = b'etc/mercurial'
# old mod_python does not set sys.argv
if len(getattr(sys, 'argv', [])) > 0:
p = os.path.dirname(os.path.dirname(pycompat.sysargv[0]))
if p != b'/':
path.extend(_rcfiles(os.path.join(p, root)))
path.extend(_rcfiles(b'/' + root))
return path
def userrcpath():
if pycompat.sysplatform == b'plan9':
return [encoding.environ[b'home'] + b'/lib/hgrc']
elif pycompat.isdarwin:
return [os.path.expanduser(b'~/.hgrc')]
else:
confighome = encoding.environ.get(b'XDG_CONFIG_HOME')
if confighome is None or not os.path.isabs(confighome):
confighome = os.path.expanduser(b'~/.config')
return [
os.path.expanduser(b'~/.hgrc'),
os.path.join(confighome, b'hg', b'hgrc'),
]
def termsize(ui):
try:
import termios
TIOCGWINSZ = termios.TIOCGWINSZ # unavailable on IRIX (issue3449)
except (AttributeError, ImportError):
return 80, 24
for dev in (ui.ferr, ui.fout, ui.fin):
try:
try:
fd = dev.fileno()
except AttributeError:
continue
if not os.isatty(fd):
continue
arri = fcntl.ioctl(fd, TIOCGWINSZ, b'\0' * 8)
height, width = array.array('h', arri)[:2]
if width > 0 and height > 0:
return width, height
except ValueError:
pass
except IOError as e:
if e[0] == errno.EINVAL: # pytype: disable=unsupported-operands
pass
else:
raise
return 80, 24