rely on python psutil to get the cwd

This commit is contained in:
Matt Rose 2020-05-15 11:27:36 -04:00
parent 2db730f769
commit 40ba659f6d
2 changed files with 2 additions and 147 deletions

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@ -14,14 +14,8 @@
import platform
import os
import pwd
from .util import dbg, err
try:
import psutil
psutil_avail = True
except (ImportError):
dbg('psutil not found')
psutil_avail = False
from .util import dbg, err
def get_default_cwd():
"""Determine a reasonable default cwd"""
@ -35,51 +29,6 @@ def get_default_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:
from . 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
elif psutil_avail:
func = psutil_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 as 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'))
def psutil_cwd(pid):
"""Determine the cwd using psutil which also supports Darwin"""
return psutil.Process(pid).as_dict()['cwd']
return psutil.Process().as_dict()['cwd']
# vim: set expandtab ts=4 sw=4:

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@ -1,94 +0,0 @@
#!/usr/bin/env python
#
# Copyright (c) 2008, Thomas Hurst <tom@hur.st>
#
# Use of this file is unrestricted provided this notice is retained.
# If you use it, it'd be nice if you dropped me a note. Also beer.
"""
freebsd.get_process_cwd(pid):
Use sysctl() to retrieve the cwd of an arbitrary process on FreeBSD
using kern.proc.filedesc, as used by procstat(1).
Tested on FreeBSD 7-STABLE/amd64 from April 11 2008.
"""
import platform
from ctypes import *
from ctypes.util import find_library
class sockaddr_storage(Structure):
"""struct sockaddr_storage, defined in /usr/include/sys/socket.h"""
_fields_ = [
('ss_len', c_char),
('ss_family', c_char), # /usr/include/sys/_types.h; _uint8_t
('__ss_pad1', c_char * 6), # (sizeof(int64) - sizeof(char) - sizeof(ss_family_t))
('__ss_align', c_longlong),
('__ss_pad2', c_char * 112), # (128(maxsize) - sizeof(char) - sizeof(ss_family_t) -
# sizeof(ss_pad1) - sizeof(int64))
]
class kinfo_file(Structure):
"""struct kinfo_file, defined in /usr/include/sys/user.h """
_fields_ = [
('kf_structsize', c_int),
('kf_type', c_int),
('kf_fd', c_int),
('kf_ref_count', c_int),
('kf_flags', c_int),
('kf_offset', c_size_t), # this is a off_t, a pointer
('kf_vnode_type', c_int),
('kf_sock_domain', c_int),
('kf_sock_type', c_int),
('kf_sock_protocol', c_int),
('kf_path', c_char * 1024), # PATH_MAX
('kf_sa_local', sockaddr_storage),
('kf_sa_peer', sockaddr_storage),
]
def get_process_cwd(pid):
"""Return string containing the current working directory of the given pid,
or None on failure."""
# /usr/include/sys/sysctl.h
# CTL_KERN, KERN_PROC, KERN_PROC_FILEDESC
oid = (c_uint * 4)(1, 14, 14, pid)
if libc.sysctl(oid, 4, None, byref(uintlen), None, 0) < 0:
return None
buf = c_char_p(" " * uintlen.value)
if libc.sysctl(oid, 4, buf, byref(uintlen), None, 0) < 0:
return None
kifs = cast(buf, POINTER(kinfo_file))
for i in range(0, uintlen.value / sizeof(kinfo_file)):
kif = kifs[i]
if kif.kf_fd == -1: # KF_FD_TYPE_CWD
return kif.kf_path
if platform.system() in ['FreeBSD', 'OpenBSD']:
libc = CDLL(find_library('c'))
uintlen = c_size_t(sizeof(c_uint))
ver = c_uint(0)
if (libc.sysctlbyname('kern.osreldate', byref(ver), byref(uintlen), None, 0) < 0):
raise OSError("sysctlbyname returned < 0")
# kern.proc.filedesc added for procstat(1) after these __FreeBSD_versions
if ver.value < 700104 and ver.value < 800019:
raise NotImplementedError("cwd detection requires a recent 7.0-STABLE or 8-CURRENT")
if __name__ == '__main__':
import os, sys
print(" => %d cwd = %s" % (os.getpid(), get_process_cwd(os.getpid())))
for pid in sys.argv:
try:
pid = int(pid)
except:
pass
else:
print(" => %d cwd = %s" % (pid, get_process_cwd(pid)))