pager: preserve Hg's exit code (and fix Windows support) (
issue3225)
This changes how the pager extension invokes the pager. Prior to this change,
the extension would fork Hg and exec the pager in the parent process. This
loses Hg exit code, and it doesn't work on Windows.
Now the pager is invoked using the subprocess library, and an atexit handler is
registered that makes Hg wait for the pager to exit before it exits itself.
Note that if you exit the pager before Hg is done running, you'll get an exit
code of 255, which is caused by Python blowing up due to a broken pipe. If you
set pager.quiet=True, you'll get the OS-level return code of 141.
# memory.py - track memory usage
#
# Copyright 2009 Matt Mackall <mpm@selenic.com> and others
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
'''helper extension to measure memory usage
Reads current and peak memory usage from ``/proc/self/status`` and
prints it to ``stderr`` on exit.
'''
import atexit
def memusage(ui):
"""Report memory usage of the current process."""
status = None
result = {'peak': 0, 'rss': 0}
try:
# This will only work on systems with a /proc file system
# (like Linux).
status = open('/proc/self/status', 'r')
for line in status:
parts = line.split()
key = parts[0][2:-1].lower()
if key in result:
result[key] = int(parts[1])
finally:
if status is not None:
status.close()
ui.write_err(", ".join(["%s: %.1f MiB" % (key, value / 1024.0)
for key, value in result.iteritems()]) + "\n")
def extsetup(ui):
atexit.register(memusage, ui)