# Module handling the download of updates #------------------------------------------------------------------------------ from config import Config import os import sys import urllib2 import tempfile import socket import subprocess import hashlib if os.name=="nt": import win32api #------------------------------------------------------------------------------ manifestName = "MLXMANIFEST" toremoveName = "toremove" #------------------------------------------------------------------------------ class Manifest(object): """The manifest of the files. The manifest file consists of one line for each file. Each line contains 3 items separated by tabs: - the path of the file relative to the distribution's root - the size of the file - the MD5 sum of the file.""" def __init__(self): """Construct the manifest.""" self._files = {} @property def files(self): """Get an iterator over the files. Each file is returned as a 3-tuple with items as in the file.""" for (path, (size, sum)) in self._files.iteritems(): yield (path, size, sum) def addFile(self, path, size, sum): """Add a file to the manifest.""" self._files[path] = (size, sum) def addFiles(self, baseDirectory, subdirectory): """Add the files in the given directory and subdirectories of it to the manifest.""" directory = baseDirectory for d in subdirectory: directory = os.path.join(directory, d) for entry in os.listdir(directory): fullPath = os.path.join(directory, entry) if os.path.isfile(fullPath): size = os.stat(fullPath).st_size sum = hashlib.md5() with open(fullPath, "rb") as f: while True: data = f.read(4096) if data: sum.update(data) else: break self.addFile("/".join(subdirectory + [entry]), size, sum.hexdigest()) elif os.path.isdir(fullPath): self.addFiles(baseDirectory, subdirectory + [entry]) def readFrom(self, file): """Read a manifest from the given file object.""" for line in iter(file.readline, ""): (path, size, sum) = line.strip().split("\t") self._files[path] = (int(size), sum) def writeInto(self, file): """Write the manifest into the file at the given path.""" for (path, (size, sum)) in self._files.iteritems(): file.write("%s\t%d\t%s\n" % (path, size, sum)) def compare(self, other): """Compare this manifest with the other one. This returns a tuple of two lists: - the files that are either different or are present in other, but not here. Each file is returned as a 3-tuple as with other functions, the size and sum are those of the new file. - the paths of the files that are present here, but not in other.""" modifiedAndNew = [] for (path, otherSize, otherSum) in other.files: if path in self._files: (size, sum) = self._files[path] if size!=otherSize or sum!=otherSum: modifiedAndNew.append((path, otherSize, otherSum)) else: modifiedAndNew.append((path, otherSize, otherSum)) removed = [path for path in self._files if path not in other._files] return (modifiedAndNew, removed) #------------------------------------------------------------------------------ class ClientListener(object): """A listener that sends any requests via a socket.""" def __init__(self, sock): """Construct the listener.""" self._sock = sock def downloadingManifest(self): """Called when the downloading of the manifest has started.""" self._send(["downloadingManifest"]) def downloadedManifest(self): """Called when the manifest has been downloaded.""" self._send(["downloadedManifest"]) def needSudo(self): """Called when an admin-level program must be called to complete the update. This is not valid from a client, as that client is supposed to be the admin-level program :)""" assert False def setTotalSize(self, numToModifyAndNew, totalSize, numToRemove, numToRemoveLocal): """Called when starting the downloading of the files.""" self._send(["setTotalSize", str(numToModifyAndNew), str(totalSize), str(numToRemove), str(numToRemoveLocal)]) def setDownloaded(self, downloaded): """Called periodically after downloading a certain amount of data.""" self._send(["setDownloaded", str(downloaded)]) def startRenaming(self): """Called when the renaming of the downloaded files is started.""" self._send(["startRenaming"]) def renamed(self, path, count): """Called when a file has been renamed.""" self._send(["renamed", path, str(count)]) def startRemoving(self): """Called when the removing of files has started.""" self._send(["startRemoving"]) def removed(self, path, count): """Called when a file has been removed.""" self._send(["removed", path, str(count)]) def writingManifest(self): """Called when we have started writing the manifest.""" self._send(["writingManifest"]) def done(self): """Called when the update has completed.""" self._send(["done"]) def failed(self, what): """Called when something has failed.""" self._send(["failed", what]) def _send(self, words): """Send the given words via the socket.""" self._sock.send("\t".join(words) + "\n") #------------------------------------------------------------------------------ def readLocalManifest(directory): """Read the local manifest from the given directory.""" manifestPath = os.path.join(directory, manifestName) manifest = Manifest() try: with open(manifestPath, "rt") as f: manifest.readFrom(f) except Exception, e: print "Error reading the manifest, ignoring:", str(e) manifest = Manifest() return manifest #------------------------------------------------------------------------------ def prepareUpdate(directory, updateURL, listener): """Prepare the update by downloading the manifest and comparing it with the local one.""" manifest = readLocalManifest(directory) updateURL += "/" + os.name listener.downloadingManifest() f = None try: updateManifest = Manifest() f= urllib2.urlopen(updateURL + "/" + manifestName) updateManifest.readFrom(f) except Exception, e: print >> sys.stderr, "Error downloading manifest:", str(e) listener.failed(str(e)) return None finally: if f is not None: f.close() listener.downloadedManifest() (modifiedAndNew, removed) = manifest.compare(updateManifest) return (manifest, updateManifest, modifiedAndNew, removed) #------------------------------------------------------------------------------ def getToremoveFiles(directory): """Add the files to remove from the toremove directory.""" toremove = [] toremoveDirectory = os.path.join(directory, toremoveName) if os.path.isdir(toremoveDirectory): for entry in os.listdir(toremoveDirectory): toremove.append(os.path.join(toremoveName, entry)) return toremove #------------------------------------------------------------------------------ def createLocalPath(directory, path): """Create a local path from the given manifest path.""" localPath = directory for element in path.split("/"): localPath = os.path.join(localPath, element) return localPath #------------------------------------------------------------------------------ def getToremoveDir(toremoveDir, directory): """Get the path of the directory that will contain the files that are to be removed.""" if toremoveDir is None: toremoveDir = os.path.join(directory, toremoveName) try: os.mkdir(toremoveDir) except: pass return toremoveDir #------------------------------------------------------------------------------ def removeFile(toremoveDir, directory, path): """Remove the file at the given path or store it in a temporary directory. If the removal of the file fails, it will be stored in a temporary directory. This is useful for files thay may be open and cannot be removed right away.""" try: os.remove(path) except: try: sum = hashlib.md5() sum.update(path) toremoveDir = getToremoveDir(toremoveDir, directory) os.rename(path, os.path.join(toremoveDir, sum.hexdigest())) except Exception, e: print "Cannot remove file " + path + ": " + str(e) #------------------------------------------------------------------------------ def updateFiles(directory, updateURL, listener, manifest, modifiedAndNew, removed, localRemoved): """Update the files according to the given information.""" totalSize = 0 for (path, size, sum) in modifiedAndNew: totalSize += size listener.setTotalSize(len(modifiedAndNew), totalSize, len(removed), len(localRemoved)) downloaded = 0 fin = None toremoveDir = None try: updateURL += "/" + os.name for (path, size, sum) in modifiedAndNew: targetFile = createLocalPath(directory, path) targetFile += "." targetFile += sum targetDirectory = os.path.dirname(targetFile) if not os.path.isdir(targetDirectory): os.makedirs(targetDirectory) with open(targetFile, "wb") as fout: fin = urllib2.urlopen(updateURL + "/" + path) while True: data = fin.read(4096) if not data: break fout.write(data) downloaded += len(data) listener.setDownloaded(downloaded) fin.close() fin = None listener.startRenaming() count = 0 for (path, size, sum) in modifiedAndNew: targetFile = createLocalPath(directory, path) downloadedFile = targetFile + "." + sum if os.name=="nt" and os.path.isfile(targetFile): removeFile(toremoveDir, directory, targetFile) os.rename(downloadedFile, targetFile) count += 1 listener.renamed(path, count) listener.startRemoving() count = 0 removed += localRemoved removed.sort(reverse = True) for path in removed: removePath = createLocalPath(directory, path) removeFile(toremoveDir, directory, removePath) removeDirectory = os.path.dirname(removePath) try: os.removedirs(removeDirectory) except: pass count += 1 listener.removed(path, count) listener.writingManifest() manifestPath = os.path.join(directory, manifestName) with open(manifestPath, "wt") as f: manifest.writeInto(f) listener.done() except Exception, e: print >> sys.stderr, "Error:", str(e) listener.failed(str(e)) #------------------------------------------------------------------------------ def isDirectoryWritable(directory): """Determine if the given directory can be written.""" checkFile = os.path.join(directory, "writable.chk") try: f = open(checkFile, "wt") f.close() return True except Exception, e: return False finally: try: os.remove(checkFile) except: pass #------------------------------------------------------------------------------ def processMLXUpdate(buffer, listener): """Process the given buffer supposedly containing a list of commands.""" endsWithLine = buffer[-1]=="\n" lines = buffer.splitlines() if endsWithLine: buffer = "" else: buffer = lines[-1] lines = lines[:-1] for line in lines: words = line.split("\t") try: command = words[0] if command=="downloadingManifest": listener.downloadingManifest() elif command=="downloadedManifest": listener.downloadedManifest() elif command=="setTotalSize": listener.setTotalSize(int(words[1]), long(words[2]), int(words[3]), int(words[4])) elif command=="setDownloaded": listener.setDownloaded(long(words[1])) elif command=="startRenaming": listener.startRenaming() elif command=="renamed": listener.renamed(words[1], int(words[2])) elif command=="startRemoving": listener.startRemoving() elif command=="removed": listener.removed(words[1], int(words[2])) elif command=="writingManifest": listener.writingManifest() elif command=="done": listener.done() elif command=="failed": listener.failed(words[1]) except Exception, e: print >> sys.stderr, "Failed to parse line '%s': %s" % \ (line, str(e)) return buffer #------------------------------------------------------------------------------ def sudoUpdate(directory, updateURL, listener, manifest): """Perform the update via the mlxupdate program.""" manifestFD = None manifestFile = None serverSocket = None mlxUpdateSocket = None try: (manifestFD, manifestFile) = tempfile.mkstemp() f = os.fdopen(manifestFD, "wt") try: manifest.writeInto(f) finally: f.close() manifestFD = None serverSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) serverSocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) serverSocket.bind(("127.0.0.1", 0)) (_host, port) = serverSocket.getsockname() serverSocket.listen(1) if os.name=="nt": win32api.ShellExecute(0, "open", os.path.join(directory, "mlxupdate"), str(port) + " " + manifestFile, "", 1) else: process = subprocess.Popen([os.path.join(directory, "mlxupdate"), str(port), manifestFile], shell = os.name=="nt") (mlxUpdateSocket, _) = serverSocket.accept() serverSocket.close() serverSocket = None buffer = "" while True: data = mlxUpdateSocket.recv(4096) if not data: break; buffer += data buffer = processMLXUpdate(buffer, listener) mlxUpdateSocket.close() mlxUpdateSocket = None if os.name!="nt": process.wait() except Exception, e: print >> sys.stderr, "Failed updating:", str(e) listener.failed(str(e)) finally: if serverSocket is not None: try: serverSocket.close() except: pass if mlxUpdateSocket is not None: try: mlxUpdateSocket.close() except: pass if manifestFD is not None: try: os.close(manifestFD) except: pass if manifestFile is not None: try: os.remove(manifestFile) except: pass #------------------------------------------------------------------------------ def update(directory, updateURL, listener, fromGUI = False): """Perform the update.""" result = prepareUpdate(directory, updateURL, listener) if result is None: return (manifest, updateManifest, modifiedAndNew, removed) = result localRemoved = getToremoveFiles(directory) if not modifiedAndNew and not removed and not localRemoved: listener.done() return if fromGUI and not isDirectoryWritable(directory): if listener.needSudo(): sudoUpdate(directory, updateURL, listener, updateManifest) else: updateFiles(directory, updateURL, listener, updateManifest, modifiedAndNew, removed, localRemoved) #------------------------------------------------------------------------------ def updateProcess(): """This is called in the child process, when we need a child process.""" clientSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) clientSocket.connect(("127.0.0.1", int(sys.argv[1]))) config = Config() directory = os.path.dirname(sys.argv[0]) manifest = readLocalManifest(directory) updateManifest = Manifest() with open(sys.argv[2], "rt") as f: updateManifest.readFrom(f) (modifiedAndNew, removed) = manifest.compare(updateManifest) localRemoved = getToremoveFiles(directory) updateFiles(directory, config.updateURL, ClientListener(clientSocket), updateManifest, modifiedAndNew, removed, localRemoved) #------------------------------------------------------------------------------ def buildManifest(directory): """Build a manifest from the contents of the given directory, into the given directory.""" manifestPath = os.path.join(directory, manifestName) try: os.remove(manifestPath) except: pass manifest = Manifest() manifest.addFiles(directory, []) with open(manifestPath, "wt") as f: manifest.writeInto(f) #------------------------------------------------------------------------------ # if __name__ == "__main__": # manifest1 = Manifest() # manifest1.addFile("file1.exe", 3242, "40398754589435345934") # manifest1.addFile("dir/file2.zip", 45645, "347893245873456987") # manifest1.addFile("dir/file3.txt", 123, "3432434534534534") # with open("manifest1", "wt") as f: # manifest1.writeInto(f) # manifest2 = Manifest() # manifest2.addFile("file1.exe", 4353, "390734659834756349876") # manifest2.addFile("dir/file2.zip", 45645, "347893245873456987") # manifest2.addFile("dir/file4.log", 2390, "56546546546546") # with open("manifest2", "wt") as f: # manifest2.writeInto(f) # manifest1 = Manifest() # with open("manifest1", "rt") as f: # manifest1.readFrom(f) # manifest2 = Manifest() # with open("manifest2", "rt") as f: # manifest2.readFrom(f) # (modifiedAndNew, removed) = manifest1.compare(manifest2) # for (path, size, sum) in modifiedAndNew: # print "modified or new:", path, size, sum # for path in removed: # print "removed:", path #------------------------------------------------------------------------------