Source code for subuserlib.classes.registry

# -*- coding: utf-8 -*-

Each user's settings are stored in a "registry". This is a git repository with a set of json files which store the state of the subuser installation.

#external imports
import os
import errno
import sys
from contextlib import contextmanager
import json
#internal imports
from subuserlib.classes import repositories
from subuserlib.classes import subusers
from subuserlib.classes import userOwnedObject
from subuserlib.classes.gitRepository import GitRepository
import subuserlib.print
import subuserlib.lock

[docs]class Registry(userOwnedObject.UserOwnedObject): def __init__(self,user,gitReadHash="master", ignoreVersionLocks=False, initialized = False): self.__subusers = None self.__changeLog = u"" self.commit_message = None self.__changed = False self.__logOutputVerbosity = 1 self.initialized = initialized self.ignoreVersionLocks = ignoreVersionLocks if "SUBUSER_VERBOSITY" in os.environ: try: self.__logOutputVerbosity = int(os.environ["SUBUSER_VERBOSITY"]) except ValueError: subuserlib.print.printWithoutCrashing("Invalid verbosity setting! Verbosity may be set to any integer.") self.__repositories = None self.__gitRepository = None self.__gitReadHash = gitReadHash userOwnedObject.UserOwnedObject.__init__(self,user) self.registryDir = self.getUser().getConfig()["registry-dir"] self.logFilePath = os.path.join(self.registryDir,"commit_log") self.__gitRepository = GitRepository(self.getUser(),self.registryDir)
[docs] def getGitRepository(self): return self.__gitRepository
[docs] def getGitReadHash(self): return self.__gitReadHash
[docs] def getSubusers(self): if self.__subusers is None: self.__subusers = subusers.Subusers(self.getUser()) return self.__subusers
[docs] def getRepositories(self): if not self.__repositories: self.__repositories = repositories.Repositories(self.getUser()) return self.__repositories
[docs] def ensureGitRepoInitialized(self): if not os.path.exists(os.path.join(self.getUser().getConfig()["registry-dir"],".git")): self.initialized = False # Ensure git is setup before we start to make changes. self.getGitRepository().getGitExecutable() self.getUser().getEndUser().makedirs(self.getUser().getConfig()["registry-dir"]) self.getGitRepository().run(["init"]) self.logChange("Initial commit.") self.commit("Initial commit.") self.initialized = True
[docs] def setLogOutputVerbosity(self,level): self.__logOutputVerbosity = level
[docs] def getLogOutputVerbosity(self): return self.__logOutputVerbosity
[docs] def log(self,message,verbosityLevel=1): """ If the current verbosity level is equal to or greater than verbosityLevel, print the message to the screen. If the current verbosity level is equal to or greater than verbosityLevel minus one, add the message to the log. Do not mark the registry as changed. """ message = message.rstrip() if (verbosityLevel-1) <= self.getLogOutputVerbosity(): self.__changeLog = self.__changeLog + message + u"\n" if verbosityLevel <= self.getLogOutputVerbosity(): subuserlib.print.printWithoutCrashing(message)
[docs] def logChange(self,message,verbosityLevel=1): """ Add a log message to the registry's change log, and mark the registry as changed. """ self.log(message,verbosityLevel=verbosityLevel) self.__changed = True
[docs] def setChanged(self,changed=True): self.__changed = changed
[docs] def logRenameCommit(self, message): """ Add a new message to the top of the log. """ self.__changeLog = message + u"\n" + self.__changeLog
[docs] def commit(self,message=None): """ Git commit the changes to the registry files, installed-miages.json and subusers.json. """ if self.__changed: self.getRepositories().save() self.getSubusers().save() with self.getUser().getEndUser().get_file(self.logFilePath) as fd: fd.write(self.__changeLog) self.getGitRepository().run(["add","."]) if message is None: if self.commit_message is not None: message = self.commit_message else: message = self.__changeLog self.getGitRepository().commit(message) # Log to live log announcement = {} announcement["commit"] = self.getGitRepository().getHashOfRef("master") self.logToLiveLog(announcement) self.__changed = False self.__changeLog = u""
[docs] def logToLiveLog(self,announcement): announcementJson = json.dumps(announcement) liveLogDir=os.path.join(self.getUser().homeDir,".subuser/registry-live-log") if os.path.isdir(liveLogDir): for liveLogPid in os.listdir(liveLogDir): liveLogPath = os.path.join(liveLogDir,liveLogPid) try: liveLog =,os.O_WRONLY|os.O_NONBLOCK) os.write(liveLog,announcementJson) except OSError: pass
# TODO Note: We don't close the file descriptors, because doing so makes the pipe close on the other end too. This would be a file descriptor leak if this method was used in any long running process(which it is not). @contextmanager
[docs] def getLock(self): """ To be used with with. """ try: self.getUser().getEndUser().makedirs(self.getUser().getConfig()["lock-dir"]) except OSError as exception: if exception.errno != errno.EEXIST: raise try: lock = subuserlib.lock.getLock(self.getUser().getEndUser().get_file(os.path.join(self.getUser().getConfig()["lock-dir"],"registry.lock"),'w'),timeout=1) with lock: yield except IOError as e: if e.errno != errno.EINTR: raise e sys.exit("Another subuser process is currently running and has a lock on the registry. Please try again later.")
[docs] def cleanOutOldPermissions(self): for _,_,_,permissionsPath in self.getGitRepository().getFileStructureAtCommit(self.getGitReadHash()).lsTree("permissions"): _,subuserName = os.path.split(permissionsPath) exists = os.path.exists(os.path.join(self.registryDir,permissionsPath)) if exists and subuserName not in self.getSubusers(): self.logChange("Removing left over permissions for no-longer extant subuser %s"%subuserName) try: self.getGitRepository().run(["rm","-r",permissionsPath]) except subuserlib.classes.gitRepository.GitException as e: self.log(" %s"%str(e))