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# Copyright: 2005 Gentoo Foundation
# Author(s): Brian Harring (ferringb@gentoo.org)
# License: GPL2
# $Id$
import os
from portage.cache import template
from portage.data import portage_gid
class FsBased(template.database):
"""template wrapping fs needed options, and providing _ensure_access as a way to
attempt to ensure files have the specified owners/perms"""
def __init__(self, *args, **config):
"""throws InitializationError if needs args aren't specified
gid and perms aren't listed do to an oddity python currying mechanism
gid=portage_gid
perms=0665"""
for x,y in (("gid",portage_gid),("perms",0664)):
if x in config:
setattr(self, "_"+x, config[x])
del config[x]
else:
setattr(self, "_"+x, y)
super(FsBased, self).__init__(*args, **config)
if self.label.startswith(os.path.sep):
# normpath.
self.label = os.path.sep + os.path.normpath(self.label).lstrip(os.path.sep)
def _ensure_access(self, path, mtime=-1):
"""returns true or false if it's able to ensure that path is properly chmod'd and chowned.
if mtime is specified, attempts to ensure that's correct also"""
try:
os.chown(path, -1, self._gid)
os.chmod(path, self._perms)
if mtime:
mtime=long(mtime)
os.utime(path, (mtime, mtime))
except (OSError, IOError):
return False
return True
def _ensure_dirs(self, path=None):
"""with path!=None, ensure beyond self.location. otherwise, ensure self.location"""
if path:
path = os.path.dirname(path)
base = self.location
else:
path = self.location
base='/'
for dir in path.lstrip(os.path.sep).rstrip(os.path.sep).split(os.path.sep):
base = os.path.join(base,dir)
if not os.path.exists(base):
um=os.umask(0)
try:
os.mkdir(base, self._perms | 0111)
os.chown(base, -1, self._gid)
finally:
os.umask(um)
def gen_label(base, label):
"""if supplied label is a path, generate a unique label based upon label, and supplied base path"""
if label.find(os.path.sep) == -1:
return label
label = label.strip("\"").strip("'")
label = os.path.join(*(label.rstrip(os.path.sep).split(os.path.sep)))
tail = os.path.split(label)[1]
return "%s-%X" % (tail, abs(label.__hash__()))
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