#!/usr/bin/python
# Terminator by Chris Jones <cmsj@tenshu.net>
# GPL v2 only
"""cwd.py - function necessary to get the cwd for a given pid on various OSes
>>> cwd = get_default_cwd()
>>> cwd.__class__.__name__
'str'
>>> func = get_pid_cwd()
>>> func.__class__.__name__
'function'
"""
import platform
import os
import pwd
from util import dbg, err
def get_default_cwd():
"""Determine a reasonable default cwd"""
cwd = os.getcwd()
if not os.path.exists(cwd) or not os.path.isdir(cwd):
try:
cwd = pwd.getpwuid(os.getuid())[5]
except KeyError:
cwd = '/'
return(cwd)
def get_pid_cwd():
"""Determine an appropriate cwd function for the OS we are running on"""
func = lambda pid: None
system = platform.system()
if system == 'Linux':
dbg('Using Linux get_pid_cwd')
func = linux_get_pid_cwd
elif system == 'FreeBSD':
try:
import freebsd
func = freebsd.get_process_cwd
dbg('Using FreeBSD get_pid_cwd')
except (OSError, NotImplementedError, ImportError):
dbg('FreeBSD version too old for get_pid_cwd')
elif system == 'SunOS':
dbg('Using SunOS get_pid_cwd')
func = sunos_get_pid_cwd
else:
dbg('Unable to determine a get_pid_cwd for OS: %s' % system)
return(func)
def proc_get_pid_cwd(pid, path):
"""Extract the cwd of a PID from proc, given the PID and the /proc path to
insert it into, e.g. /proc/%s/cwd"""
try:
cwd = os.path.realpath(path % pid)
except Exception, ex:
err('Unable to get cwd for PID %s: %s' % (pid, ex))
cwd = '/'
return(cwd)
def linux_get_pid_cwd(pid):
"""Determine the cwd for a given PID on Linux kernels"""
return(proc_get_pid_cwd(pid, '/proc/%s/cwd'))
def sunos_get_pid_cwd(pid):
"""Determine the cwd for a given PID on SunOS kernels"""
return(proc_get_pid_cwd(pid, '/proc/%s/path/cwd'))
# vim: set expandtab ts=4 sw=4:
