# Copyright 2004 Gentoo Foundation # Distributed under the terms of the GNU General Public License v2 # $Id$ import os import errno import logging import shlex import stat import string import sys from portage.exception import PortageException, FileNotFound, \ OperationNotPermitted, PermissionDenied, ReadOnlyFileSystem import portage.exception from portage.dep import isvalidatom try: import cPickle except ImportError: import pickle as cPickle try: import cStringIO as StringIO except ImportError: import StringIO noiselimit = 0 def initialize_logger(level=logging.WARN): """Sets up basic logging of portage activities Args: level: the level to emit messages at ('info', 'debug', 'warning' ...) Returns: None """ logging.basicConfig(level=logging.WARN, format='[%(levelname)-4s] %(message)s') def writemsg(mystr,noiselevel=0,fd=None): """Prints out warning and debug messages based on the noiselimit setting""" global noiselimit if fd is None: fd = sys.stderr if noiselevel <= noiselimit: fd.write(mystr) fd.flush() def writemsg_stdout(mystr,noiselevel=0): """Prints messages stdout based on the noiselimit setting""" writemsg(mystr, noiselevel=noiselevel, fd=sys.stdout) def normalize_path(mypath): """ os.path.normpath("//foo") returns "//foo" instead of "/foo" We dislike this behavior so we create our own normpath func to fix it. """ if mypath.startswith(os.path.sep): # posixpath.normpath collapses 3 or more leading slashes to just 1. return os.path.normpath(2*os.path.sep + mypath) else: return os.path.normpath(mypath) def grabfile(myfilename, compat_level=0, recursive=0): """This function grabs the lines in a file, normalizes whitespace and returns lines in a list; if a line begins with a #, it is ignored, as are empty lines""" mylines=grablines(myfilename, recursive) newlines=[] for x in mylines: #the split/join thing removes leading and trailing whitespace, and converts any whitespace in the line #into single spaces. myline=" ".join(x.split()) if not len(myline): continue if myline[0]=="#": # Check if we have a compat-level string. BC-integration data. # '##COMPAT==>N<==' 'some string attached to it' mylinetest = myline.split("<==",1) if len(mylinetest) == 2: myline_potential = mylinetest[1] mylinetest = mylinetest[0].split("##COMPAT==>") if len(mylinetest) == 2: if compat_level >= int(mylinetest[1]): # It's a compat line, and the key matches. newlines.append(myline_potential) continue else: continue newlines.append(myline) return newlines def map_dictlist_vals(func,myDict): """Performs a function on each value of each key in a dictlist. Returns a new dictlist.""" new_dl = {} for key in myDict: new_dl[key] = [] new_dl[key] = map(func,myDict[key]) return new_dl def stack_dictlist(original_dicts, incremental=0, incrementals=[], ignore_none=0): """ Stacks an array of dict-types into one array. Optionally merging or overwriting matching key/value pairs for the dict[key]->list. Returns a single dict. Higher index in lists is preferenced. Example usage: >>> from portage.util import stack_dictlist >>> print stack_dictlist( [{'a':'b'},{'x':'y'}]) >>> {'a':'b','x':'y'} >>> print stack_dictlist( [{'a':'b'},{'a':'c'}], incremental = True ) >>> {'a':['b','c'] } >>> a = {'KEYWORDS':['x86','alpha']} >>> b = {'KEYWORDS':['-x86']} >>> print stack_dictlist( [a,b] ) >>> { 'KEYWORDS':['x86','alpha','-x86']} >>> print stack_dictlist( [a,b], incremental=True) >>> { 'KEYWORDS':['alpha'] } >>> print stack_dictlist( [a,b], incrementals=['KEYWORDS']) >>> { 'KEYWORDS':['alpha'] } @param original_dicts a list of (dictionary objects or None) @type list @param incremental True or false depending on whether new keys should overwrite keys which already exist. @type boolean @param incrementals A list of items that should be incremental (-foo removes foo from the returned dict). @type list @param ignore_none Appears to be ignored, but probably was used long long ago. @type boolean """ final_dict = {} for mydict in original_dicts: if mydict is None: continue for y in mydict: if not y in final_dict: final_dict[y] = [] for thing in mydict[y]: if thing: if incremental or y in incrementals: if thing == "-*": final_dict[y] = [] continue elif thing.startswith("-"): try: final_dict[y].remove(thing[1:]) except ValueError: pass continue if thing not in final_dict[y]: final_dict[y].append(thing) if y in final_dict and not final_dict[y]: del final_dict[y] return final_dict def stack_dicts(dicts, incremental=0, incrementals=[], ignore_none=0): """Stacks an array of dict-types into one array. Optionally merging or overwriting matching key/value pairs for the dict[key]->string. Returns a single dict.""" final_dict = None for mydict in dicts: if mydict is None: if ignore_none: continue else: return None if final_dict is None: final_dict = {} for y in mydict.keys(): if True: if final_dict.has_key(y) and (incremental or (y in incrementals)): final_dict[y] += " "+mydict[y][:] else: final_dict[y] = mydict[y][:] mydict[y] = " ".join(mydict[y].split()) # Remove extra spaces. return final_dict def stack_lists(lists, incremental=1): """Stacks an array of list-types into one array. Optionally removing distinct values using '-value' notation. Higher index is preferenced. all elements must be hashable.""" new_list = {} for x in lists: for y in filter(None, x): if incremental: if y == "-*": new_list.clear() elif y.startswith("-"): new_list.pop(y[1:], None) else: new_list[y] = True else: new_list[y] = True return new_list.keys() def grabdict(myfilename, juststrings=0, empty=0, recursive=0, incremental=1): """ This function grabs the lines in a file, normalizes whitespace and returns lines in a dictionary @param myfilename: file to process @type myfilename: string (path) @param juststrings: only return strings @type juststrings: Boolean (integer) @param empty: Ignore certain lines @type empty: Boolean (integer) @param recursive: Recursively grab ( support for /etc/portage/package.keywords/* and friends ) @type recursive: Boolean (integer) @param incremental: Append to the return list, don't overwrite @type incremental: Boolean (integer) @rtype: Dictionary @returns: 1. Returns the lines in a file in a dictionary, for example: 'sys-apps/portage x86 amd64 ppc' would return { "sys-apps/portage" : [ 'x86', 'amd64', 'ppc' ] the line syntax is key : [list of values] """ newdict={} for x in grablines(myfilename, recursive): #the split/join thing removes leading and trailing whitespace, and converts any whitespace in the line #into single spaces. if x[0] == "#": continue myline=x.split() if len(myline) < 2 and empty == 0: continue if len(myline) < 1 and empty == 1: continue if incremental: newdict.setdefault(myline[0], []).extend(myline[1:]) else: newdict[myline[0]] = myline[1:] if juststrings: for k, v in newdict.iteritems(): newdict[k] = " ".join(v) return newdict def grabdict_package(myfilename, juststrings=0, recursive=0): """ Does the same thing as grabdict except it validates keys with isvalidatom()""" pkgs=grabdict(myfilename, juststrings, empty=1, recursive=recursive) # We need to call keys() here in order to avoid the possibility of # "RuntimeError: dictionary changed size during iteration" # when an invalid atom is deleted. for x in pkgs.keys(): if not isvalidatom(x): del(pkgs[x]) writemsg("--- Invalid atom in %s: %s\n" % (myfilename, x), noiselevel=-1) return pkgs def grabfile_package(myfilename, compatlevel=0, recursive=0): pkgs=grabfile(myfilename, compatlevel, recursive=recursive) for x in range(len(pkgs)-1, -1, -1): pkg = pkgs[x] if pkg[0] in '-*': # -atom *pkg for packages file pkg = pkg[1:] if not isvalidatom(pkg): writemsg("--- Invalid atom in %s: %s\n" % (myfilename, pkgs[x]), noiselevel=-1) del(pkgs[x]) return pkgs def grablines(myfilename,recursive=0): mylines=[] if recursive and os.path.isdir(myfilename): if myfilename in ["RCS", "CVS", "SCCS"]: return mylines dirlist = os.listdir(myfilename) dirlist.sort() for f in dirlist: if not f.startswith(".") and not f.endswith("~"): mylines.extend(grablines( os.path.join(myfilename, f), recursive)) else: try: myfile = open(myfilename, "r") mylines = myfile.readlines() myfile.close() except IOError, e: if e.errno == PermissionDenied.errno: raise PermissionDenied(myfilename) pass return mylines def writedict(mydict,myfilename,writekey=True): """Writes out a dict to a file; writekey=0 mode doesn't write out the key and assumes all values are strings, not lists.""" myfile = None try: myfile = atomic_ofstream(myfilename) if not writekey: for x in mydict.values(): myfile.write(x+"\n") else: for x in mydict: myfile.write("%s %s\n" % (x, " ".join(mydict[x]))) myfile.close() except IOError: if myfile is not None: myfile.abort() return 0 return 1 class _tolerant_shlex(shlex.shlex): def sourcehook(self, newfile): try: return shlex.shlex.sourcehook(self, newfile) except EnvironmentError, e: writemsg("!!! Parse error in '%s': source command failed: %s\n" % \ (self.infile, str(e)), noiselevel=-1) return (newfile, StringIO.StringIO()) def getconfig(mycfg, tolerant=0, allow_sourcing=False, expand=True): if isinstance(expand, dict): # Some existing variable definitions have been # passed in, for use in substitutions. expand_map = expand expand = True else: expand_map = {} mykeys = {} try: f=open(mycfg,'r') except IOError, e: if e.errno == PermissionDenied.errno: raise PermissionDenied(mycfg) if e.errno != errno.ENOENT: raise return None try: if tolerant: shlex_class = _tolerant_shlex else: shlex_class = shlex.shlex # The default shlex.sourcehook() implementation # only joins relative paths when the infile # attribute is properly set. lex = shlex_class(f, infile=mycfg, posix=True) lex.wordchars=string.digits+string.letters+"~!@#$%*_\:;?,./-+{}" lex.quotes="\"'" if allow_sourcing: lex.source="source" while 1: key=lex.get_token() if key == "export": key = lex.get_token() if key is None: #normal end of file break; equ=lex.get_token() if (equ==''): #unexpected end of file #lex.error_leader(self.filename,lex.lineno) if not tolerant: writemsg("!!! Unexpected end of config file: variable "+str(key)+"\n", noiselevel=-1) raise Exception("ParseError: Unexpected EOF: "+str(mycfg)+": on/before line "+str(lex.lineno)) else: return mykeys elif (equ!='='): #invalid token #lex.error_leader(self.filename,lex.lineno) if not tolerant: raise Exception("ParseError: Invalid token " + \ "'%s' (not '='): %s: line %s" % \ (equ, mycfg, lex.lineno)) else: return mykeys val=lex.get_token() if val is None: #unexpected end of file #lex.error_leader(self.filename,lex.lineno) if not tolerant: writemsg("!!! Unexpected end of config file: variable "+str(key)+"\n", noiselevel=-1) raise portage.exception.CorruptionError("ParseError: Unexpected EOF: "+str(mycfg)+": line "+str(lex.lineno)) else: return mykeys if expand: mykeys[key] = varexpand(val, expand_map) expand_map[key] = mykeys[key] else: mykeys[key] = val except SystemExit, e: raise except Exception, e: raise portage.exception.ParseError(str(e)+" in "+mycfg) return mykeys #cache expansions of constant strings cexpand={} def varexpand(mystring, mydict={}): newstring = cexpand.get(" "+mystring, None) if newstring is not None: return newstring """ new variable expansion code. Preserves quotes, handles \n, etc. This code is used by the configfile code, as well as others (parser) This would be a good bunch of code to port to C. """ numvars=0 mystring=" "+mystring #in single, double quotes insing=0 indoub=0 pos=1 newstring=" " while (pos=len(mystring)): newstring=newstring+mystring[pos] break else: a=mystring[pos+1] pos=pos+2 if a=='a': newstring=newstring+chr(007) elif a=='b': newstring=newstring+chr(010) elif a=='e': newstring=newstring+chr(033) elif (a=='f') or (a=='n'): newstring=newstring+chr(012) elif a=='r': newstring=newstring+chr(015) elif a=='t': newstring=newstring+chr(011) elif a=='v': newstring=newstring+chr(013) elif a!='\n': #remove backslash only, as bash does: this takes care of \\ and \' and \" as well newstring=newstring+mystring[pos-1:pos] continue elif (mystring[pos]=="$") and (mystring[pos-1]!="\\"): pos=pos+1 if mystring[pos]=="{": pos=pos+1 braced=True else: braced=False myvstart=pos validchars=string.ascii_letters+string.digits+"_" while mystring[pos] in validchars: if (pos+1)>=len(mystring): if braced: cexpand[mystring]="" return "" else: pos=pos+1 break pos=pos+1 myvarname=mystring[myvstart:pos] if braced: if mystring[pos]!="}": cexpand[mystring]="" return "" else: pos=pos+1 if len(myvarname)==0: cexpand[mystring]="" return "" numvars=numvars+1 if mydict.has_key(myvarname): newstring=newstring+mydict[myvarname] else: newstring=newstring+mystring[pos] pos=pos+1 else: newstring=newstring+mystring[pos] pos=pos+1 if numvars==0: cexpand[mystring]=newstring[1:] return newstring[1:] def pickle_write(data,filename,debug=0): import os try: myf=open(filename,"w") cPickle.dump(data,myf,-1) myf.flush() myf.close() writemsg("Wrote pickle: "+str(filename)+"\n",1) os.chown(myefn,uid,portage_gid) os.chmod(myefn,0664) except SystemExit, e: raise except Exception, e: return 0 return 1 def pickle_read(filename,default=None,debug=0): import os if not os.access(filename, os.R_OK): writemsg("pickle_read(): File not readable. '"+filename+"'\n",1) return default data = None try: myf = open(filename) mypickle = cPickle.Unpickler(myf) mypickle.find_global = None data = mypickle.load() myf.close() del mypickle,myf writemsg("pickle_read(): Loaded pickle. '"+filename+"'\n",1) except SystemExit, e: raise except Exception, e: writemsg("!!! Failed to load pickle: "+str(e)+"\n",1) data = default return data def dump_traceback(msg, noiselevel=1): import sys, traceback info = sys.exc_info() if not info[2]: stack = traceback.extract_stack()[:-1] error = None else: stack = traceback.extract_tb(info[2]) error = str(info[1]) writemsg("\n====================================\n", noiselevel=noiselevel) writemsg("%s\n\n" % msg, noiselevel=noiselevel) for line in traceback.format_list(stack): writemsg(line, noiselevel=noiselevel) if error: writemsg(error+"\n", noiselevel=noiselevel) writemsg("====================================\n\n", noiselevel=noiselevel) def unique_array(s): """lifted from python cookbook, credit: Tim Peters Return a list of the elements in s in arbitrary order, sans duplicates""" n = len(s) # assume all elements are hashable, if so, it's linear try: return list(set(s)) except TypeError: pass # so much for linear. abuse sort. try: t = list(s) t.sort() except TypeError: pass else: assert n > 0 last = t[0] lasti = i = 1 while i < n: if t[i] != last: t[lasti] = last = t[i] lasti += 1 i += 1 return t[:lasti] # blah. back to original portage.unique_array u = [] for x in s: if x not in u: u.append(x) return u def apply_permissions(filename, uid=-1, gid=-1, mode=-1, mask=-1, stat_cached=None, follow_links=True): """Apply user, group, and mode bits to a file if the existing bits do not already match. The default behavior is to force an exact match of mode bits. When mask=0 is specified, mode bits on the target file are allowed to be a superset of the mode argument (via logical OR). When mask>0, the mode bits that the target file is allowed to have are restricted via logical XOR. Returns True if the permissions were modified and False otherwise.""" modified = False if stat_cached is None: try: if follow_links: stat_cached = os.stat(filename) else: stat_cached = os.lstat(filename) except OSError, oe: func_call = "stat('%s')" % filename if oe.errno == errno.EPERM: raise OperationNotPermitted(func_call) elif oe.errno == errno.EACCES: raise PermissionDenied(func_call) elif oe.errno == errno.ENOENT: raise FileNotFound(filename) else: raise if (uid != -1 and uid != stat_cached.st_uid) or \ (gid != -1 and gid != stat_cached.st_gid): try: if follow_links: os.chown(filename, uid, gid) else: import portage.data portage.data.lchown(filename, uid, gid) modified = True except OSError, oe: func_call = "chown('%s', %i, %i)" % (filename, uid, gid) if oe.errno == errno.EPERM: raise OperationNotPermitted(func_call) elif oe.errno == errno.EACCES: raise PermissionDenied(func_call) elif oe.errno == errno.EROFS: raise ReadOnlyFileSystem(func_call) elif oe.errno == errno.ENOENT: raise FileNotFound(filename) else: raise new_mode = -1 st_mode = stat_cached.st_mode & 07777 # protect from unwanted bits if mask >= 0: if mode == -1: mode = 0 # Don't add any mode bits when mode is unspecified. else: mode = mode & 07777 if (mode & st_mode != mode) or \ ((mask ^ st_mode) & st_mode != st_mode): new_mode = mode | st_mode new_mode = (mask ^ new_mode) & new_mode elif mode != -1: mode = mode & 07777 # protect from unwanted bits if mode != st_mode: new_mode = mode # The chown system call may clear S_ISUID and S_ISGID # bits, so those bits are restored if necessary. if modified and new_mode == -1 and \ (st_mode & stat.S_ISUID or st_mode & stat.S_ISGID): if mode == -1: new_mode = st_mode else: mode = mode & 07777 if mask >= 0: new_mode = mode | st_mode new_mode = (mask ^ new_mode) & new_mode else: new_mode = mode if not (new_mode & stat.S_ISUID or new_mode & stat.S_ISGID): new_mode = -1 if not follow_links and stat.S_ISLNK(stat_cached.st_mode): # Mode doesn't matter for symlinks. new_mode = -1 if new_mode != -1: try: os.chmod(filename, new_mode) modified = True except OSError, oe: func_call = "chmod('%s', %s)" % (filename, oct(new_mode)) if oe.errno == errno.EPERM: raise OperationNotPermitted(func_call) elif oe.errno == errno.EACCES: raise PermissionDenied(func_call) elif oe.errno == errno.EROFS: raise ReadOnlyFileSystem(func_call) elif oe.errno == errno.ENOENT: raise FileNotFound(filename) raise return modified def apply_stat_permissions(filename, newstat, **kwargs): """A wrapper around apply_secpass_permissions that gets uid, gid, and mode from a stat object""" return apply_secpass_permissions(filename, uid=newstat.st_uid, gid=newstat.st_gid, mode=newstat.st_mode, **kwargs) def apply_recursive_permissions(top, uid=-1, gid=-1, dirmode=-1, dirmask=-1, filemode=-1, filemask=-1, onerror=None): """A wrapper around apply_secpass_permissions that applies permissions recursively. If optional argument onerror is specified, it should be a function; it will be called with one argument, a PortageException instance. Returns True if all permissions are applied and False if some are left unapplied.""" if onerror is None: # Default behavior is to dump errors to stderr so they won't # go unnoticed. Callers can pass in a quiet instance. def onerror(e): if isinstance(e, OperationNotPermitted): writemsg("Operation Not Permitted: %s\n" % str(e), noiselevel=-1) elif isinstance(e, FileNotFound): writemsg("File Not Found: '%s'\n" % str(e), noiselevel=-1) else: raise all_applied = True for dirpath, dirnames, filenames in os.walk(top): try: applied = apply_secpass_permissions(dirpath, uid=uid, gid=gid, mode=dirmode, mask=dirmask) if not applied: all_applied = False except PortageException, e: all_applied = False onerror(e) for name in filenames: try: applied = apply_secpass_permissions(os.path.join(dirpath, name), uid=uid, gid=gid, mode=filemode, mask=filemask) if not applied: all_applied = False except PortageException, e: all_applied = False onerror(e) return all_applied def apply_secpass_permissions(filename, uid=-1, gid=-1, mode=-1, mask=-1, stat_cached=None, follow_links=True): """A wrapper around apply_permissions that uses secpass and simple logic to apply as much of the permissions as possible without generating an obviously avoidable permission exception. Despite attempts to avoid an exception, it's possible that one will be raised anyway, so be prepared. Returns True if all permissions are applied and False if some are left unapplied.""" if stat_cached is None: try: if follow_links: stat_cached = os.stat(filename) else: stat_cached = os.lstat(filename) except OSError, oe: func_call = "stat('%s')" % filename if oe.errno == errno.EPERM: raise OperationNotPermitted(func_call) elif oe.errno == errno.EACCES: raise PermissionDenied(func_call) elif oe.errno == errno.ENOENT: raise FileNotFound(filename) else: raise all_applied = True import portage.data # not imported globally because of circular dep if portage.data.secpass < 2: if uid != -1 and \ uid != stat_cached.st_uid: all_applied = False uid = -1 if gid != -1 and \ gid != stat_cached.st_gid and \ gid not in os.getgroups(): all_applied = False gid = -1 apply_permissions(filename, uid=uid, gid=gid, mode=mode, mask=mask, stat_cached=stat_cached, follow_links=follow_links) return all_applied class atomic_ofstream(file): """Write a file atomically via os.rename(). Atomic replacement prevents interprocess interference and prevents corruption of the target file when the write is interrupted (for example, when an 'out of space' error occurs).""" def __init__(self, filename, mode='w', follow_links=True, **kargs): """Opens a temporary filename.pid in the same directory as filename.""" self._aborted = False if follow_links: canonical_path = os.path.realpath(filename) self._real_name = canonical_path tmp_name = "%s.%i" % (canonical_path, os.getpid()) try: super(atomic_ofstream, self).__init__(tmp_name, mode=mode, **kargs) return except (OSError, IOError), e: if canonical_path == filename: raise writemsg("!!! Failed to open file: '%s'\n" % tmp_name, noiselevel=-1) writemsg("!!! %s\n" % str(e), noiselevel=-1) self._real_name = filename tmp_name = "%s.%i" % (filename, os.getpid()) super(atomic_ofstream, self).__init__(tmp_name, mode=mode, **kargs) def close(self): """Closes the temporary file, copies permissions (if possible), and performs the atomic replacement via os.rename(). If the abort() method has been called, then the temp file is closed and removed.""" if not self.closed: try: super(atomic_ofstream, self).close() if not self._aborted: try: apply_stat_permissions(self.name, os.stat(self._real_name)) except OperationNotPermitted: pass except FileNotFound: pass except OSError, oe: # from the above os.stat call if oe.errno in (errno.ENOENT, errno.EPERM): pass else: raise os.rename(self.name, self._real_name) finally: # Make sure we cleanup the temp file # even if an exception is raised. try: os.unlink(self.name) except OSError, oe: pass def abort(self): """If an error occurs while writing the file, the user should call this method in order to leave the target file unchanged. This will call close() automatically.""" if not self._aborted: self._aborted = True self.close() def __del__(self): """If the user does not explicitely call close(), it is assumed that an error has occurred, so we abort().""" if not self.closed: self.abort() # ensure destructor from the base class is called base_destructor = getattr(super(atomic_ofstream, self), '__del__', None) if base_destructor is not None: base_destructor() def write_atomic(file_path, content): f = None try: f = atomic_ofstream(file_path) f.write(content) f.close() except (IOError, OSError), e: if f: f.abort() func_call = "write_atomic('%s')" % file_path if e.errno == errno.EPERM: raise OperationNotPermitted(func_call) elif e.errno == errno.EACCES: raise PermissionDenied(func_call) elif e.errno == errno.EROFS: raise ReadOnlyFileSystem(func_call) elif e.errno == errno.ENOENT: raise FileNotFound(file_path) else: raise def ensure_dirs(dir_path, *args, **kwargs): """Create a directory and call apply_permissions. Returns True if a directory is created or the permissions needed to be modified, and False otherwise.""" created_dir = False try: os.makedirs(dir_path) created_dir = True except OSError, oe: func_call = "makedirs('%s')" % dir_path if oe.errno in (errno.EEXIST, errno.EISDIR): pass elif oe.errno == errno.EPERM: raise OperationNotPermitted(func_call) elif oe.errno == errno.EACCES: raise PermissionDenied(func_call) elif oe.errno == errno.EROFS: raise ReadOnlyFileSystem(func_call) else: raise perms_modified = apply_permissions(dir_path, *args, **kwargs) return created_dir or perms_modified class LazyItemsDict(dict): """A mapping object that behaves like a standard dict except that it allows for lazy initialization of values via callable objects. Lazy items can be overwritten and deleted just as normal items.""" def __init__(self, initial_items=None): dict.__init__(self) self.lazy_items = {} if initial_items is not None: self.update(initial_items) def addLazyItem(self, item_key, value_callable, *pargs, **kwargs): """Add a lazy item for the given key. When the item is requested, value_callable will be called with *pargs and **kwargs arguments.""" self.lazy_items[item_key] = (value_callable, pargs, kwargs) # make it show up in self.keys(), etc... dict.__setitem__(self, item_key, None) def addLazySingleton(self, item_key, value_callable, *pargs, **kwargs): """This is like addLazyItem except value_callable will only be called a maximum of 1 time and the result will be cached for future requests.""" class SingletonItem(object): def __init__(self, value_callable, *pargs, **kwargs): self._callable = value_callable self._pargs = pargs self._kwargs = kwargs self._called = False def __call__(self): if not self._called: self._called = True self._value = self._callable(*self._pargs, **self._kwargs) return self._value self.addLazyItem(item_key, SingletonItem(value_callable, *pargs, **kwargs)) def update(self, map_obj): if isinstance(map_obj, LazyItemsDict): for k in map_obj: if k in map_obj.lazy_items: dict.__setitem__(self, k, None) else: dict.__setitem__(self, k, map_obj[k]) self.lazy_items.update(map_obj.lazy_items) else: dict.update(self, map_obj) def __getitem__(self, item_key): if item_key in self.lazy_items: value_callable, pargs, kwargs = self.lazy_items[item_key] return value_callable(*pargs, **kwargs) else: return dict.__getitem__(self, item_key) def __setitem__(self, item_key, value): if item_key in self.lazy_items: del self.lazy_items[item_key] dict.__setitem__(self, item_key, value) def __delitem__(self, item_key): if item_key in self.lazy_items: del self.lazy_items[item_key] dict.__delitem__(self, item_key) class ConfigProtect(object): def __init__(self, myroot, protect_list, mask_list): self.myroot = myroot self.protect_list = protect_list self.mask_list = mask_list self.updateprotect() def updateprotect(self): """Update internal state for isprotected() calls. Nonexistent paths are ignored.""" self.protect = [] self._dirs = set() for x in self.protect_list: ppath = normalize_path( os.path.join(self.myroot, x.lstrip(os.path.sep))) mystat = None try: if stat.S_ISDIR(os.stat(ppath).st_mode): self._dirs.add(ppath) self.protect.append(ppath) except OSError: # If it doesn't exist, there's no need to protect it. pass self.protectmask = [] for x in self.mask_list: ppath = normalize_path( os.path.join(self.myroot, x.lstrip(os.path.sep))) mystat = None try: """Use lstat so that anything, even a broken symlink can be protected.""" if stat.S_ISDIR(os.lstat(ppath).st_mode): self._dirs.add(ppath) self.protectmask.append(ppath) """Now use stat in case this is a symlink to a directory.""" if stat.S_ISDIR(os.stat(ppath).st_mode): self._dirs.add(ppath) except OSError: # If it doesn't exist, there's no need to mask it. pass def isprotected(self, obj): """Returns True if obj is protected, False otherwise. The caller must ensure that obj is normalized with a single leading slash. A trailing slash is optional for directories.""" masked = 0 protected = 0 sep = os.path.sep for ppath in self.protect: if len(ppath) > masked and obj.startswith(ppath): if ppath in self._dirs: if obj != ppath and not obj.startswith(ppath + sep): # /etc/foo does not match /etc/foobaz continue elif obj != ppath: # force exact match when CONFIG_PROTECT lists a # non-directory continue protected = len(ppath) #config file management for pmpath in self.protectmask: if len(pmpath) >= protected and obj.startswith(pmpath): if pmpath in self._dirs: if obj != pmpath and \ not obj.startswith(pmpath + sep): # /etc/foo does not match /etc/foobaz continue elif obj != pmpath: # force exact match when CONFIG_PROTECT_MASK lists # a non-directory continue #skip, it's in the mask masked = len(pmpath) return protected > masked def new_protect_filename(mydest, newmd5=None): """Resolves a config-protect filename for merging, optionally using the last filename if the md5 matches. (dest,md5) ==> 'string' --- path_to_target_filename (dest) ==> ('next', 'highest') --- next_target and most-recent_target """ # config protection filename format: # ._cfg0000_foo # 0123456789012 prot_num = -1 last_pfile = "" if not os.path.exists(mydest): return mydest real_filename = os.path.basename(mydest) real_dirname = os.path.dirname(mydest) for pfile in os.listdir(real_dirname): if pfile[0:5] != "._cfg": continue if pfile[10:] != real_filename: continue try: new_prot_num = int(pfile[5:9]) if new_prot_num > prot_num: prot_num = new_prot_num last_pfile = pfile except ValueError: continue prot_num = prot_num + 1 new_pfile = normalize_path(os.path.join(real_dirname, "._cfg" + str(prot_num).zfill(4) + "_" + real_filename)) old_pfile = normalize_path(os.path.join(real_dirname, last_pfile)) if last_pfile and newmd5: import portage.checksum try: last_pfile_md5 = portage.checksum.perform_md5(old_pfile) except FileNotFound: # The file suddenly disappeared or it's a broken symlink. pass else: if last_pfile_md5 == newmd5: return old_pfile return new_pfile def getlibpaths(): """ Return a list of paths that are used for library lookups """ # the following is based on the information from ld.so(8) rval = os.environ.get("LD_LIBRARY_PATH", "").split(":") rval.extend(grabfile("/etc/ld.so.conf")) rval.append("/usr/lib") rval.append("/lib") rval = [normalize_path(x) for x in rval if x != ""] return rval