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# 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 2 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, write to the Free Software Foundation, Inc.,
# 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
"""
Some shell/term utilities, useful to write some python scripts instead of shell
scripts
:author: Logilab
:copyright: 2003-2008 LOGILAB S.A. (Paris, FRANCE)
:contact: http://www.logilab.fr/ -- mailto:python-projects@logilab.org
"""
__docformat__ = "restructuredtext en"
import os
import glob
import shutil
import sys
import tempfile
import time
from os.path import exists, isdir, islink, basename, join, walk
from logilab.common import STD_BLACKLIST
def chown(path, login=None, group=None):
"""same as `os.chown` function but accepting user login or group name as
argument. If login or group is omitted, it's left unchanged.
Note: you must own the file to chown it (or be root). Otherwise OSError is raised.
"""
if login is None:
uid = -1
else:
try:
uid = int(login)
except ValueError:
import pwd
uid = pwd.getpwnam(login).pw_uid
if group is None:
gid = -1
else:
try:
gid = int(group)
except ValueError:
import grp
gid = grp.getgrname(group).gr_gid
os.chown(path, uid, gid)
def mv(source, destination, _action=shutil.move):
"""a shell like mv, supporting wildcards
"""
sources = glob.glob(source)
if len(sources) > 1:
assert isdir(destination)
for filename in sources:
_action(filename, join(destination, basename(filename)))
else:
try:
source = sources[0]
except IndexError:
raise OSError('No file matching %s' % source)
if isdir(destination) and exists(destination):
destination = join(destination, basename(source))
try:
_action(source, destination)
except OSError, ex:
raise OSError('Unable to move %r to %r (%s)' % (
source, destination, ex))
def rm(*files):
"""a shell like rm, supporting wildcards
"""
for wfile in files:
for filename in glob.glob(wfile):
if islink(filename):
os.remove(filename)
elif isdir(filename):
shutil.rmtree(filename)
else:
os.remove(filename)
def cp(source, destination):
"""a shell like cp, supporting wildcards
"""
mv(source, destination, _action=shutil.copy)
def find(directory, exts, exclude=False, blacklist=STD_BLACKLIST):
"""recursivly find files ending with the given extensions from the directory
:type directory: str
:param directory:
directory where the search should start
:type exts: basestring or list or tuple
:param exts:
extensions or lists or extensions to search
:type exclude: boolean
:param exts:
if this argument is True, returning files NOT ending with the given
extensions
:type blacklist: list or tuple
:param blacklist:
optional list of files or directory to ignore, default to the value of
`logilab.common.STD_BLACKLIST`
:rtype: list
:return:
the list of all matching files
"""
if isinstance(exts, basestring):
exts = (exts,)
if exclude:
def match(filename, exts):
for ext in exts:
if filename.endswith(ext):
return False
return True
else:
def match(filename, exts):
for ext in exts:
if filename.endswith(ext):
return True
return False
def func(files, directory, fnames):
"""walk handler"""
# remove files/directories in the black list
for norecurs in blacklist:
try:
fnames.remove(norecurs)
except ValueError:
continue
for filename in fnames:
src = join(directory, filename)
if isdir(src):
continue
if match(filename, exts):
files.append(src)
files = []
walk(directory, func, files)
return files
class Execute:
"""This is a deadlock safe version of popen2 (no stdin), that returns
an object with errorlevel, out and err
"""
def __init__(self, command):
outfile = tempfile.mktemp()
errfile = tempfile.mktemp()
self.status = os.system("( %s ) >%s 2>%s" %
(command, outfile, errfile)) >> 8
self.out = open(outfile,"r").read()
self.err = open(errfile,"r").read()
os.remove(outfile)
os.remove(errfile)
def acquire_lock(lock_file, max_try=10, delay=10):
"""acquire a lock represented by a file on the file system"""
count = 0
while max_try <= 0 or count < max_try:
if not exists(lock_file):
break
count += 1
time.sleep(delay)
else:
raise Exception('Unable to acquire %s' % lock_file)
stream = open(lock_file, 'w')
stream.write(str(os.getpid()))
stream.close()
def release_lock(lock_file):
"""release a lock represented by a file on the file system"""
os.remove(lock_file)
class ProgressBar(object):
"""a simple text progression bar"""
def __init__(self, nbops, size=20., stream=sys.stdout):
self._dotevery = max(nbops / size, 1)
self._fstr = '\r[%-20s]'
self._dotcount, self._dots = 1, []
self._stream = stream
def update(self):
"""update the progression bar"""
self._dotcount += 1
if self._dotcount >= self._dotevery:
self._dotcount = 1
self._dots.append('.')
self._stream.write(self._fstr % ''.join(self._dots))
self._stream.flush()
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