1ae1ecc6c2
We don't lose anything by accepting this, because using backslashes in file or dir names is out of question, as Windows users can't see them.
720 lines
28 KiB
Python
Executable file
720 lines
28 KiB
Python
Executable file
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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#
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# main.py --- Main module for terrasync.py
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#
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# Copyright (C) 2016 Torsten Dreyer
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; either version 2 of the
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# License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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import argparse
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import enum
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import hashlib
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import os
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import re
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import shutil
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import sys
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import time
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import urllib
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from urllib.parse import urlparse
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from http.client import HTTPConnection, _CS_IDLE, HTTPException
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from os import listdir
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from os.path import isfile, isdir, join
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from .exceptions import UserError, NetworkError
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from .virtual_path import VirtualPath
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PROGNAME = os.path.basename(sys.argv[0])
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class ExitStatus(enum.Enum):
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SUCCESS = 0
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# The program exit status is 1 when an exception isn't caught.
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ERROR = 1
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CHECK_MODE_FOUND_MISMATCH = 2
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# *****************************************************************************
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# * Utility functions *
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# *****************************************************************************
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# If a path matches this regexp, we really don't want to delete it recursively
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# (“cre” stands for “compiled regexp”).
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_removeDirectoryTree_dangerous_cre = re.compile(
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r"""^(/ (home (/ [^/]*)? )? /* | # for Unix-like systems
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[a-zA-Z]: [\/]* # for Windows
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)$""", re.VERBOSE)
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def removeDirectoryTree(base, whatToRemove):
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"""Recursively remove directory 'whatToRemove', with safety checks.
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This function ensures that 'whatToRemove' does not resolve to a
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directory such as /, /home, /home/foobar, C:\, d:\, etc. It is also
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an error if 'whatToRemove' does not literally start with the value
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of 'base' (IOW, this function refuses to erase anything that is not
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under 'base').
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'whatToRemove' is *not* interpreted relatively to 'base' (this would
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be doable, just a different API).
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"""
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assert os.path.isdir(base), "Not a directory: {!r}".format(base)
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assert (base and
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whatToRemove.startswith(base) and
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whatToRemove[len(base):].startswith(os.sep)), \
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"Unexpected base path for removeDirectoryTree(): {!r}".format(base)
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absPath = os.path.abspath(whatToRemove)
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if _removeDirectoryTree_dangerous_cre.match(absPath):
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raise UserError("in order to protect your data, refusing to "
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"recursively delete '{}'".format(absPath))
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else:
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shutil.rmtree(absPath)
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def computeHash(fileLike):
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hash = hashlib.sha1()
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for chunk in iter(lambda: fileLike.read(4096), b""):
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hash.update(chunk)
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return hash.hexdigest()
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def hashForFile(fname):
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with open(fname, "rb") as f:
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return computeHash(f)
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# *****************************************************************************
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# * Network-related classes *
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# *****************************************************************************
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class HTTPGetCallback:
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def __init__(self, src, callback):
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"""Initialize an HTTPGetCallback instance.
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src -- a VirtualPath instance (corresponding to the path on
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the server for which a GET request is to be issued)
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callback -- a function taking two parameters: the URL (string)
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and an http.client.HTTPResponse instance. When
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invoked, the callback return value will be returned
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by HTTPGetter.get().
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"""
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self.callback = callback
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self.src = src
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class HTTPGetter:
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def __init__(self, baseUrl, maxPending=10):
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self.baseUrl = baseUrl
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self.parsedBaseUrl = urlparse(baseUrl)
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self.maxPending = maxPending
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self.requests = []
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self.pendingRequests = []
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self.httpConnection = HTTPConnection(self.parsedBaseUrl.netloc)
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self.httpRequestHeaders = headers = {'Host':self.parsedBaseUrl.netloc,'Content-Length':0,'Connection':'Keep-Alive','User-Agent':'FlightGear terrasync.py'}
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def assembleUrl(self, httpGetCallback):
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assert not self.parsedBaseUrl.path.endswith('/'), self.parsedBaseUrl
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return self.parsedBaseUrl.path + str(httpGetCallback.src)
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def doGet(self, httpGetCallback):
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conn = self.httpConnection
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url = self.assembleUrl(httpGetCallback)
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self.httpConnection.request("GET", url, None, self.httpRequestHeaders)
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httpResponse = self.httpConnection.getresponse()
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# 'httpResponse' is an http.client.HTTPResponse instance
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return httpGetCallback.callback(url, httpResponse)
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def get(self, httpGetCallback):
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nbRetries = nbRetriesLeft = 5
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while True:
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try:
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return self.doGet(httpGetCallback)
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except HTTPException as exc:
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if nbRetriesLeft == 0:
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raise NetworkError(
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"after {nbRetries} retries for URL {url}: {errMsg}"
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.format(nbRetries=nbRetries,
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url=self.assembleUrl(httpGetCallback),
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errMsg=exc)) from exc
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# Try to reconnect
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self.httpConnection.close()
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time.sleep(1)
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self.httpConnection.connect()
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nbRetriesLeft -= 1
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#################################################################################################################################
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class DirIndex:
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def __init__(self, dirIndexFile):
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self.d = []
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self.f = []
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self.version = 0
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self.path = None # will be a VirtualPath instance when set
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with open(dirIndexFile) as f:
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self.readFrom(f)
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def readFrom(self, readable):
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for line in readable:
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line = line.strip()
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if line.startswith('#'):
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continue
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tokens = line.split(':')
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if len(tokens) == 0:
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continue
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if tokens[0] == "version":
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self.version = int(tokens[1])
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elif tokens[0] == "path":
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# This is relative to the repository root
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self.path = VirtualPath(tokens[1])
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elif tokens[0] == "d":
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self.d.append({ 'name': tokens[1], 'hash': tokens[2] })
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elif tokens[0] == "f":
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self.f.append({ 'name': tokens[1], 'hash': tokens[2], 'size': tokens[3] })
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def getVersion(self):
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return self.version
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def getPath(self):
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return self.path
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def getDirectories(self):
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return self.d
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def getFiles(self):
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return self.f
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#################################################################################################################################
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class HTTPDownloadRequest(HTTPGetCallback):
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def __init__(self, terrasync, src, dst, callback = None ):
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"""Initialize an HTTPDownloadRequest instance.
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terrasync -- a TerraSync instance
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src -- a VirtualPath instance (corresponding to the path
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on the server for which a GET request is to be
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issued)
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dst -- file path (or whatever open() accepts) where the
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downloaded data is to be stored
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callback -- a function that will be called if the download is
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successful, or None if no such callback is desired.
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The function must take one parameter: when invoked,
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it will be passed this HTTPDownloadRequest
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instance. Its return value is ignored.
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"""
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super().__init__(src, self.callback)
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self.terrasync = terrasync
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self.dst = dst
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self.mycallback = callback
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# 'httpResponse' is an http.client.HTTPResponse instance
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def callback(self, url, httpResponse):
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# I suspect this doesn't handle HTTP redirects and things like that. As
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# mentioned at <https://docs.python.org/3/library/http.client.html>,
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# http.client is a low-level interface that should normally not be used
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# directly!
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if httpResponse.status != 200:
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raise NetworkError("HTTP callback got status {status} for URL {url}"
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.format(status=httpResponse.status, url=url))
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try:
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with open(self.dst, 'wb') as f:
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f.write(httpResponse.read())
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except HTTPException as exc:
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raise NetworkError("for URL {url}: {error}"
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.format(url=url, error=exc)) from exc
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if self.mycallback != None:
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self.mycallback(self)
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class HTTPSocketRequest(HTTPGetCallback):
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"""HTTPGetCallback class whose callback returns a file-like object.
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The file-like object returned by the callback, and thus by
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HTTPGetter.get(), is a socket or similar. This allows one to read
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the data obtained from the network without necessarily storing it
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to a file.
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"""
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def __init__(self, src):
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"""Initialize an HTTPSocketRequest object.
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src -- VirtualPath instance for the resource on the server
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(presumably a file)
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"""
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HTTPGetCallback.__init__(self, src, self.callback)
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def callback(self, url, httpResponse):
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# Same comment as for HTTPDownloadRequest.callback()
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if httpResponse.status != 200:
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raise NetworkError("HTTP callback got status {status} for URL {url}"
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.format(status=httpResponse.status, url=url))
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return httpResponse
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#################################################################################################################################
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class Coordinate:
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def __init__(self, lat, lon):
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self.lat = lat
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self.lon = lon
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class DownloadBoundaries:
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def __init__(self, top, left, bottom, right):
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if top < bottom:
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raise ValueError("top cannot be less than bottom")
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if right < left:
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raise ValueError("right cannot be less than left")
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if top > 90 or bottom < -90:
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raise ValueError("top and bottom must be a valid latitude")
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if left < -180 or right > 180:
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raise ValueError("left and right must be a valid longitude")
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self.top = top
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self.left = left
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self.bottom = bottom
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self.right = right
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def is_coordinate_inside_boundaries(self, coordinate):
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if coordinate.lat < self.bottom or coordinate.lat > self.top:
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return False
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if coordinate.lon < self.left or coordinate.lon > self.right:
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return False
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return True
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def parse_terrasync_coordinate(coordinate):
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matches = re.match("(w|e)(\d{3})(n|s)(\d{2})", coordinate)
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if not matches:
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return None
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lon = int(matches.group(2))
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if matches.group(1) == "w":
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lon *= -1
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lat = int(matches.group(4))
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if matches.group(3) == "s":
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lat *= -1
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return Coordinate(lat, lon)
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class Report:
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"""Gather and format data about the state of a TerraSync mirror."""
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def __init__(self, targetDir):
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self.targetDir = targetDir
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self.dirsWithMissingIndex = set()
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self.dirsWithMismatchingDirIndexHash = set()
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self.missingFiles = set()
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self.filesWithMismatchingHash = set()
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self.dirsSkippedDueToBoundaries = set()
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self.orphanFiles = set()
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self.orphanDirs = set()
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def addMissingDirIndex(self, directoryVirtualPath):
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self.dirsWithMissingIndex.add(directoryVirtualPath)
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def addDirIndexWithMismatchingHash(self, directoryVirtualPath):
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self.dirsWithMismatchingDirIndexHash.add(directoryVirtualPath)
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def addMissingFile(self, virtualPath):
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self.missingFiles.add(virtualPath)
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def addFileWithMismatchingHash(self, virtualPath):
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self.filesWithMismatchingHash.add(virtualPath)
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def addSkippedDueToBoundaries(self, virtualPath):
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self.dirsSkippedDueToBoundaries.add(virtualPath)
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def addOrphanFile(self, virtualPath):
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self.orphanFiles.add(virtualPath)
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def addOrphanDir(self, virtualPath):
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self.orphanDirs.add(virtualPath)
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def summaryString(self):
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reportElements = [
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("Directories with missing index", self.dirsWithMissingIndex),
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("Directories whose .dirindex file had a mismatching hash",
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self.dirsWithMismatchingDirIndexHash),
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("Missing files", self.missingFiles),
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("Files with a mismatching hash", self.filesWithMismatchingHash),
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("Directories skipped because of the specified boundaries",
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self.dirsSkippedDueToBoundaries),
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("Orphan files", self.orphanFiles),
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("Orphan directories", self.orphanDirs)]
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l = []
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for heading, setOfFilesOrDirs in reportElements:
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if setOfFilesOrDirs:
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l.append(heading + ":\n")
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l.extend( (" " + str(f) for f in sorted(setOfFilesOrDirs)) )
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l.append('') # ensure a blank line follows the list
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else:
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l.append(heading + ": none")
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return '\n'.join(l)
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def printReport(self):
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title = "{prg} report".format(prg=PROGNAME)
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print("\n" + title + '\n' + len(title)*"=", end="\n\n")
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print(self.summaryString())
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@enum.unique
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class FailedCheckReason(enum.Enum):
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"""Reasons that can cause 'check' mode to report a mismatch.
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Note that network errors and things like that do *not* belong here.
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"""
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missingDirIndexFile, mismatchingHashForDirIndexFile, \
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missingNormalFile, mismatchingHashForNormalFile, \
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orphanFile, orphanDirectory = range(6)
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# 'path': VirtualPath instance for a file or directory
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def explain(self, path):
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if self is FailedCheckReason.missingDirIndexFile:
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res = ".dirindex file '{}' is missing locally".format(path)
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elif self is FailedCheckReason.mismatchingHashForDirIndexFile:
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res = ".dirindex file '{}' doesn't have the hash it " \
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"should have according to the server".format(path)
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elif self is FailedCheckReason.missingNormalFile:
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res = "file '{}' is present on the server but missing locally" \
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.format(path)
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elif self is FailedCheckReason.mismatchingHashForNormalFile:
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res = "file '{}' doesn't have the hash given in the " \
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".dirindex file of its containing directory".format(path)
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elif self is FailedCheckReason.orphanFile:
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res = "file '{}' was found locally but is not present on the " \
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"server".format(path)
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elif self is FailedCheckReason.orphanDirectory:
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res = "directory '{}' was found locally but is not present " \
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"on the server".format(path)
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else:
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assert False, "Unhandled enum value: {!r}".format(self)
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return res
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class TerraSync:
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@enum.unique
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class Mode(enum.Enum):
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"""Main modes of operation for the TerraSync class."""
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# Using lower case for the member names, because this way
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# enumMember.name is exactly the mode string passed to --mode on the
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# command line (can be useful for messages destined to users).
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check, sync = range(2)
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def __init__(self, mode, doReport, url, target, quick, removeOrphan,
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downloadBoundaries):
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self.mode = self.Mode[mode]
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self.doReport = doReport
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self.setUrl(url).setTarget(target)
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self.quick = quick
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self.removeOrphan = removeOrphan
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self.httpGetter = None
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self.downloadBoundaries = downloadBoundaries
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# Status of the local repository (as compared to what the server says),
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# before any update we might do to it.
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self.report = Report(self.target)
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def inSyncMode(self):
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return self.mode == self.Mode.sync
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def setUrl(self, url):
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self.url = url.rstrip('/').strip()
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return self
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def setTarget(self, target):
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# Using os.path.abspath() here is safer in case the process later uses
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# os.chdir(), which would change the meaning of the "." directory.
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self.target = os.path.abspath(target)
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return self
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def start(self, virtualSubdir=VirtualPath('/')):
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"""Start the 'sync' or 'check' process.
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The 'virtualSubdir' argument must be a VirtualPath instance and
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allows one to start the 'sync' or 'check' process in a chosen
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subdirectory of the TerraSync repository, instead of at its
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root.
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"""
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# Remove the leading '/' from 'virtualSubdir' and convert to native
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# separators ('/' or '\' depending on the platform).
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localSubdir = os.path.normpath(virtualSubdir.asRelative())
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if localSubdir == ".": # just ugly, but it wouldn't hurt
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localSubdir = ""
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assert not os.path.isabs(localSubdir), repr(localSubdir)
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self.httpGetter = HTTPGetter(self.url)
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# Get the hash of the .dirindex file for 'virtualSubdir'
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try:
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request = HTTPSocketRequest(virtualSubdir / ".dirindex")
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with self.httpGetter.get(request) as fileLike:
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dirIndexHash = computeHash(fileLike)
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except HTTPException as exc:
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raise NetworkError("for the root .dirindex file: {errMsg}"
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.format(errMsg=exc)) from exc
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# Process the chosen part of the repository (recursive)
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self.processDirectoryEntry(virtualSubdir, localSubdir, dirIndexHash)
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return self.report
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def processFileEntry(self, virtualPath, localPath, fileHash):
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"""Process a file entry from a .dirindex file."""
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localFullPath = join(self.target, localPath)
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failedCheckReason = None
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if not os.path.isfile(localFullPath):
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self.report.addMissingFile(virtualPath)
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failedCheckReason = FailedCheckReason.missingNormalFile
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elif hashForFile(localFullPath) != fileHash:
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self.report.addFileWithMismatchingHash(virtualPath)
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failedCheckReason = FailedCheckReason.mismatchingHashForNormalFile
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else:
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# The file exists and has the hash mentioned in the .dirindex file
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return
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assert failedCheckReason is not None
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if self.inSyncMode():
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if os.path.isdir(localFullPath):
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# 'localFullPath' is a directory (locally), but on the server
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# it is a file -> remove the dir so that we can store the file.
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removeDirectoryTree(self.target, localFullPath)
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print("Downloading '{}'".format(virtualPath))
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request = HTTPDownloadRequest(self, virtualPath, localFullPath)
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self.httpGetter.get(request)
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else:
|
|
self.abortCheckMode(failedCheckReason, virtualPath)
|
|
|
|
def processDirectoryEntry(self, virtualPath, localPath, dirIndexHash):
|
|
"""Process a directory entry from a .dirindex file."""
|
|
print("Processing '{}'...".format(virtualPath))
|
|
|
|
coord = parse_terrasync_coordinate(virtualPath.name)
|
|
if (coord and
|
|
not self.downloadBoundaries.is_coordinate_inside_boundaries(coord)):
|
|
self.report.addSkippedDueToBoundaries(virtualPath)
|
|
return
|
|
|
|
localFullPath = join(self.target, localPath)
|
|
localDirIndex = join(localFullPath, ".dirindex")
|
|
failedCheckReason = None
|
|
|
|
if not os.path.isfile(localDirIndex):
|
|
failedCheckReason = FailedCheckReason.missingDirIndexFile
|
|
self.report.addMissingDirIndex(virtualPath)
|
|
elif hashForFile(localDirIndex) != dirIndexHash:
|
|
failedCheckReason = FailedCheckReason.mismatchingHashForDirIndexFile
|
|
self.report.addDirIndexWithMismatchingHash(virtualPath)
|
|
|
|
if failedCheckReason is None:
|
|
if not self.quick:
|
|
self.handleDirindexFile(localDirIndex)
|
|
elif self.inSyncMode():
|
|
if not os.path.exists(localFullPath):
|
|
os.makedirs(localFullPath)
|
|
|
|
request = HTTPDownloadRequest(self,
|
|
virtualPath / ".dirindex",
|
|
localDirIndex,
|
|
self.handleDirindexRequest)
|
|
self.httpGetter.get(request)
|
|
else:
|
|
self.abortCheckMode(failedCheckReason, virtualPath / ".dirindex")
|
|
|
|
def handleDirindexRequest(self, dirindexRequest):
|
|
self.handleDirindexFile(dirindexRequest.dst)
|
|
|
|
def handleDirindexFile(self, dirindexFile):
|
|
dirIndex = DirIndex(dirindexFile)
|
|
virtualBase = dirIndex.getPath() # VirtualPath instance
|
|
relativeBase = virtualBase.asRelative() # string, doesn't start with '/'
|
|
serverFiles = []
|
|
serverDirs = []
|
|
|
|
for file in dirIndex.getFiles():
|
|
f = file['name']
|
|
self.processFileEntry(virtualBase / f,
|
|
join(relativeBase, f),
|
|
file['hash'])
|
|
serverFiles.append(f)
|
|
|
|
for subdir in dirIndex.getDirectories():
|
|
d = subdir['name']
|
|
self.processDirectoryEntry(virtualBase / d,
|
|
join(relativeBase, d),
|
|
subdir['hash'])
|
|
serverDirs.append(d)
|
|
|
|
localFullPath = join(self.target, relativeBase)
|
|
localFiles = [ f for f in listdir(localFullPath)
|
|
if isfile(join(localFullPath, f)) ]
|
|
|
|
for f in localFiles:
|
|
if f != ".dirindex" and f not in serverFiles:
|
|
virtualPath = virtualBase / f
|
|
self.report.addOrphanFile(virtualPath)
|
|
|
|
if self.inSyncMode():
|
|
if self.removeOrphan:
|
|
os.remove(join(self.target, virtualPath.asRelative()))
|
|
else:
|
|
self.abortCheckMode(FailedCheckReason.orphanFile,
|
|
virtualPath)
|
|
|
|
localDirs = [ f for f in listdir(localFullPath)
|
|
if isdir(join(localFullPath, f)) ]
|
|
|
|
for d in localDirs:
|
|
if d not in serverDirs:
|
|
virtualPath = virtualBase / d
|
|
self.report.addOrphanDir(virtualPath)
|
|
|
|
if self.inSyncMode():
|
|
if self.removeOrphan:
|
|
removeDirectoryTree(self.target,
|
|
join(self.target,
|
|
virtualPath.asRelative()))
|
|
else:
|
|
self.abortCheckMode(FailedCheckReason.orphanDirectory,
|
|
virtualPath)
|
|
|
|
# 'reason' is a member of the FailedCheckReason enum
|
|
def abortCheckMode(self, reason, fileOrDirVirtualPath):
|
|
assert self.mode == self.Mode.check, self.mode
|
|
|
|
print("{prg}: exiting from 'check' mode because {explanation}."
|
|
.format(prg=PROGNAME,
|
|
explanation=reason.explain(fileOrDirVirtualPath)))
|
|
|
|
if self.doReport:
|
|
self.report.printReport()
|
|
|
|
sys.exit(ExitStatus.CHECK_MODE_FOUND_MISMATCH.value)
|
|
|
|
#################################################################################################################################
|
|
|
|
def parseCommandLine():
|
|
parser = argparse.ArgumentParser()
|
|
|
|
parser.add_argument("-u", "--url", dest="url", metavar="URL",
|
|
default="http://flightgear.sourceforge.net/scenery",
|
|
help="server URL [default: %(default)s]")
|
|
|
|
parser.add_argument("-t", "--target", dest="target", metavar="DIR",
|
|
default=".", help="""\
|
|
directory where to store the files [default: the current directory]""")
|
|
|
|
parser.add_argument("--only-subdir", dest="onlySubdir", metavar="SUBDIR",
|
|
default="", help="""\
|
|
restrict processing to this subdirectory of the TerraSync repository. Use
|
|
a path relative to the repository root, for instance 'Models/Residential'
|
|
[default: process the whole repository]""")
|
|
|
|
parser.add_argument("-q", "--quick", dest="quick", action="store_true",
|
|
default=False, help="enable quick mode")
|
|
|
|
parser.add_argument("-r", "--remove-orphan", dest="removeOrphan",
|
|
action="store_true",
|
|
default=False, help="remove old scenery files")
|
|
|
|
parser.add_argument("--mode", default="sync", choices=("check", "sync"),
|
|
help="""\
|
|
main mode of operation (default: '%(default)s'). In 'sync' mode, contents
|
|
is downloaded from the server to the target directory. On the other hand,
|
|
in 'check' mode, {progname} compares the contents of the target directory
|
|
with the remote repository without writing nor deleting anything on
|
|
disk.""".format(progname=PROGNAME))
|
|
|
|
parser.add_argument("--report", dest="report", action="store_true",
|
|
default=False,
|
|
help="""\
|
|
before normal exit, print a report of what was found""")
|
|
|
|
parser.add_argument("--top", dest="top", type=int, default=90, help="""\
|
|
maximum latitude to include in download [default: %(default)d]""")
|
|
|
|
parser.add_argument("--bottom", dest="bottom", type=int, default=-90,
|
|
help="""\
|
|
minimum latitude to include in download [default: %(default)d]""")
|
|
|
|
parser.add_argument("--left", dest="left", type=int, default=-180, help="""\
|
|
minimum longitude to include in download [default: %(default)d]""")
|
|
parser.add_argument("--right", dest="right", type=int, default=180,
|
|
help="""\
|
|
maximum longitude to include in download [default: %(default)d]""")
|
|
|
|
args = parser.parse_args()
|
|
|
|
# Perform consistency checks on the arguments
|
|
if args.mode == "check" and args.removeOrphan:
|
|
print("{prg}: 'check' mode is read-only and thus doesn't make sense "
|
|
"with\noption --remove-orphan (-r)".format(prg=PROGNAME),
|
|
file=sys.stderr)
|
|
sys.exit(ExitStatus.ERROR.value)
|
|
|
|
# Replace backslashes with forward slashes, remove leading and trailing
|
|
# slashes, collapse consecutive slashes. Yes, this implies that we tolerate
|
|
# leading slashes for --only-subdir (which makes sense because virtual
|
|
# paths are printed like that by this program, therefore it is natural for
|
|
# users to copy & paste such paths in order to use them for --only-subdir).
|
|
args.virtualSubdir = VirtualPath(args.onlySubdir.replace('\\', '/'))
|
|
|
|
# Be nice to our user in case the path starts with '\', 'C:\', etc.
|
|
if os.path.isabs(args.virtualSubdir.asRelative()):
|
|
print("{prg}: option --only-subdir expects a *relative* path, but got "
|
|
"'{subdir}'".format(prg=PROGNAME, subdir=args.onlySubdir),
|
|
file=sys.stderr)
|
|
sys.exit(ExitStatus.ERROR.value)
|
|
|
|
return args
|
|
|
|
|
|
def main():
|
|
args = parseCommandLine()
|
|
terraSync = TerraSync(args.mode, args.report, args.url, args.target,
|
|
args.quick, args.removeOrphan,
|
|
DownloadBoundaries(args.top, args.left, args.bottom,
|
|
args.right))
|
|
report = terraSync.start(args.virtualSubdir)
|
|
|
|
if args.report:
|
|
report.printReport()
|
|
|
|
sys.exit(ExitStatus.SUCCESS.value)
|