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# -*- python -*-
'''
xpybar – xmobar replacement written in python
Copyright © 2014, 2015, 2016, 2017, 2018, 2019 Mattias Andrée (maandree@kth.se)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
'''
class Locks:
'''
File lock statistics
@variable locks:list<Locks.Lock> List of file-locks
'''
def __init__(self):
'''
Constructor
'''
def convert(fields):
fields[0] = int(fields[0])
fields[4] = int(fields[4])
fields[5] = int(fields[5], 16)
fields[6] = int(fields[6], 16)
fields[7] = int(fields[7])
fields[8] = int(fields[8])
fields[9] = int(fields[9]) if not fields[9] == 'EOF' else None
return fields
with open('/proc/locks', 'rb') as file:
data = file.read()
data = data.decode('utf-8', 'replace').rstrip('\n').replace(':', ' ').replace(' ', ' ')
while ' ' in data:
data = data.replace(' ', ' ')
self.locks = [Locks.Lock(*convert(line.split(' '))) for line in data.split('\n')]
@staticmethod
def find_device(major, minor):
'''
Find a device from its major and minor number
This method will not work if a mount's mountpoint or a
device's pathname includes spaces or line feeds.
@param major:int The major number of the device, in decimal form
@param minor:int The minor number of the device, in decimal form
@return (root:str, mountpoint:str, device:str)? The root of the mount within the filesystem,
the mountpoint relative to the process's root,
and the mounted device (pathname or RAM filesystem),
`None` if not found
'''
with open('/proc/self/mountinfo', 'rb') as file:
data = file.read()
data = data.decode('utf-8', 'strict').rstrip('\n').split('\n')
devnum = '%i:%i' % (major, minor)
for line in data:
line = line.split(' ')
if not line[2] == devnum:
continue
return (line[3], line[4], line[-2])
return None
@staticmethod
def find_pathname(mountpoint, inode, alarm = 1):
'''
Find the pathname of a file based on its mountpoint and inode number
@param mountpoint:str The mountpoint of the file
@param inode:int The inode number of the file
@param alarm:int|str? The time limit of the search, `None` to search forever
@return :list<str> All found pathnames of the file
'''
from subprocess import Popen, PIPE
command = ['find', mountpoint, '-inum', str(inode), '-mount', '-print0']
if alarm is not None:
command = ['alarm', str(inode)] + command
found = Popen(command, stdin = PIPE, stdout = PIPE, stderr = PIPE).communicate()[0]
found = found.decode('utf-8', 'replace').rstrip('\n')
found = [pathname for pathname in found.split('\0') if not pathname == '']
return found
@staticmethod
def find(major, minor, inode, alarm = 1):
'''
Find the pathname of a file based on its device's major and minor number and its inode number
@param major:int The major number of the device, in decimal form
@param minor:int The minor number of the device, in decimal form
@param inode:int The inode number of the file
@param alarm:int|str? The time limit of the search, `None` to search forever
@return :list<str> All found pathnames of the file
'''
device = Locks.find_device()
if device is None:
return []
return Locks.find_pathname(device[1], inode, alarm)
class Lock:
'''
Information about a file-lock
@variable lock_id:int The unique ID of the lock
@variable lock_type:str Either 'FLOCK' or 'POSIX', indicating what lock system has been used,
'FLOCK' indicates the 'flock' system call, and 'POSIX' indicates the
'lockf' system call.
@variable mandatory:bool Whether the lock is mandatory rather than advisory
@variable shared:bool Whether the process has locked the file for reading rather than writing
@variable pid:int The ID of the process that has locked the file
@variable major:int The major number of the device on which the locked file is stored
@variable minor:int The minor number of the device on which the locked file is stored
@variable inode:int The inode number of the locked file
@variable start:int The index of the first bytes of the locked area
@variable end:int? The index of the last bytes of the locked area, `None` for end-of-file
'''
def __init__(self, lock_id, lock_type, lock_level, sharedness, pid, major, minor, inode, start, end):
'''
Constructor
@param lock_id:int The unique ID of the lock
@param lock_type:str Either 'FLOCK' or 'POSIX', indicating what lock system has been used,
'FLOCK' indicates the 'flock' system call, and 'POSIX' indicates the
'lockf' system call.
@param lock_level:str Either 'MANDATORY' or 'ADVISORY' indicating the level of the lock
@param sharedness:str Either 'READ' or 'WRITE' indicating the sharedness of the lock
@param pid:int The ID of the process that has locked the file
@param major:int The major number of the device on which the locked file is stored
@param minor:int The minor number of the device on which the locked file is stored
@param inode:int The inode number of the locked file
@param start:int The index of the first bytes of the locked area
@param end:int? The index of the last bytes of the locked area, `None` for end-of-file
'''
self.lock_id = lock_id
self.lock_type = lock_type
self.mandatory = lock_level == 'MANDATORY'
self.shared = sharedness == 'READ'
self.pid = pid
self.major = major
self.minor = minor
self.inode = inode
self.start = start
self.end = end
def find_device(self):
'''
Find the device that the locked file is located on
This method will not work if a mount's mountpoint or a
device's pathname includes spaces or line feeds.
@return (root:str, mountpoint:str, device:str)? The root of the mount within the filesystem,
the mountpoint relative to the process's root,
and the mounted device (pathname or RAM
filesystem), `None` if not found
'''
return Locks.find_device(self.major, self.minor)
def find_pathname(self, mountpoint, alarm = 1):
'''
Find the pathname of the locked file based on its mountpoint
@param mountpoint:str The mountpoint of the file
@param alarm:int|str? The time limit of the search, `None` to search forever
@return :list<str> All found pathnames of the file
'''
return Locks.find_pathname(mountpoint, self.inode, alarm)
def find(self, alarm = 1):
'''
Find the pathname of the locked file
@param alarm:int|str? The time limit of the search, `None` to search forever
@return :list<str> All found pathnames of the file
'''
return Locks.find(self.major, self.minor, self.inode, alarm)
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