// -*- mode: cpp; mode: fold -*- // Description /*{{{*/ // $Id: mirror.cc,v 1.59 2004/05/08 19:42:35 mdz Exp $ /* ###################################################################### Mirror Aquire Method - This is the Mirror aquire method for APT. ##################################################################### */ /*}}}*/ // Include Files /*{{{*/ #include <apt-pkg/fileutl.h> #include <apt-pkg/acquire-method.h> #include <apt-pkg/acquire-item.h> #include <apt-pkg/acquire.h> #include <apt-pkg/error.h> #include <apt-pkg/hashes.h> #include <apt-pkg/sourcelist.h> #include <algorithm> #include <fstream> #include <iostream> #include <stdarg.h> #include <sys/stat.h> #include <sys/types.h> #include <sys/utsname.h> #include <dirent.h> using namespace std; #include<sstream> #include "mirror.h" #include "http.h" #include "apti18n.h" /*}}}*/ /* Done: * - works with http (only!) * - always picks the first mirror from the list * - call out to problem reporting script * - supports "deb mirror://host/path/to/mirror-list/// dist component" * - uses pkgAcqMethod::FailReason() to have a string representation * of the failure that is also send to LP * * TODO: * - deal with runing as non-root because we can't write to the lists dir then -> use the cached mirror file * - better method to download than having a pkgAcquire interface here * and better error handling there! * - support more than http * - testing :) */ MirrorMethod::MirrorMethod() : HttpMethod(), DownloadedMirrorFile(false) { }; // HttpMethod::Configuration - Handle a configuration message /*{{{*/ // --------------------------------------------------------------------- /* We stash the desired pipeline depth */ bool MirrorMethod::Configuration(string Message) { if (pkgAcqMethod::Configuration(Message) == false) return false; Debug = _config->FindB("Debug::Acquire::mirror",false); return true; } /*}}}*/ // clean the mirrors dir based on ttl information bool MirrorMethod::Clean(string Dir) { vector<metaIndex *>::const_iterator I; if(Debug) clog << "MirrorMethod::Clean(): " << Dir << endl; if(Dir == "/") return _error->Error("will not clean: '/'"); // read sources.list pkgSourceList list; list.ReadMainList(); DIR *D = opendir(Dir.c_str()); if (D == 0) return _error->Errno("opendir",_("Unable to read %s"),Dir.c_str()); string StartDir = SafeGetCWD(); if (chdir(Dir.c_str()) != 0) { closedir(D); return _error->Errno("chdir",_("Unable to change to %s"),Dir.c_str()); } for (struct dirent *Dir = readdir(D); Dir != 0; Dir = readdir(D)) { // Skip some files.. if (strcmp(Dir->d_name,"lock") == 0 || strcmp(Dir->d_name,"partial") == 0 || strcmp(Dir->d_name,".") == 0 || strcmp(Dir->d_name,"..") == 0) continue; // see if we have that uri for(I=list.begin(); I != list.end(); I++) { string uri = (*I)->GetURI(); if(uri.find("mirror://") != 0) continue; string BaseUri = uri.substr(0,uri.size()-1); if (URItoFileName(BaseUri) == Dir->d_name) break; } // nothing found, nuke it if (I == list.end()) unlink(Dir->d_name); }; chdir(StartDir.c_str()); closedir(D); return true; } bool MirrorMethod::DownloadMirrorFile(string mirror_uri_str) { // not that great to use pkgAcquire here, but we do not have // any other way right now string fetch = BaseUri; fetch.replace(0,strlen("mirror://"),"http://"); if(Debug) clog << "MirrorMethod::DownloadMirrorFile(): '" << fetch << "'" << " to " << MirrorFile << endl; pkgAcquire Fetcher; new pkgAcqFile(&Fetcher, fetch, "", 0, "", "", "", MirrorFile); bool res = (Fetcher.Run() == pkgAcquire::Continue); if(res) DownloadedMirrorFile = true; Fetcher.Shutdown(); if(Debug) clog << "MirrorMethod::DownloadMirrorFile() success: " << res << endl; return res; } // Randomizes the lines in the mirror file, this is used so that // we spread the load on the mirrors evenly bool MirrorMethod::RandomizeMirrorFile(string mirror_file) { vector<string> content; string line; // read ifstream in(mirror_file.c_str()); while ( !in.eof() ) { getline(in, line); content.push_back(line); } // we want the file to be random for each different machine, but also // "stable" on the same machine. this is to avoid running into out-of-sync // issues (i.e. Release/Release.gpg different on each mirror) struct utsname buf; int seed=1, i; if(uname(&buf) == 0) { for(i=0,seed=1; buf.nodename[i] != 0; i++) { seed = seed * 31 + buf.nodename[i]; } } srand( seed ); random_shuffle(content.begin(), content.end()); // write ofstream out(mirror_file.c_str()); while ( !content.empty()) { line = content.back(); content.pop_back(); out << line << "\n"; } return true; } /* convert a the Queue->Uri back to the mirror base uri and look * at all mirrors we have for this, this is needed as queue->uri * may point to different mirrors (if TryNextMirror() was run) */ void MirrorMethod::CurrentQueueUriToMirror() { // already in mirror:// style so nothing to do if(Queue->Uri.find("mirror://") == 0) return; // find current mirror and select next one for (vector<string>::const_iterator mirror = AllMirrors.begin(); mirror != AllMirrors.end(); ++mirror) { if (Queue->Uri.find(*mirror) == 0) { Queue->Uri.replace(0, mirror->length(), BaseUri); return; } } _error->Error("Internal error: Failed to convert %s back to %s", Queue->Uri.c_str(), BaseUri.c_str()); } bool MirrorMethod::TryNextMirror() { // find current mirror and select next one for (vector<string>::const_iterator mirror = AllMirrors.begin(); mirror != AllMirrors.end(); ++mirror) { if (Queue->Uri.find(*mirror) != 0) continue; vector<string>::const_iterator nextmirror = mirror + 1; if (nextmirror == AllMirrors.end()) break; Queue->Uri.replace(0, mirror->length(), *nextmirror); if (Debug) clog << "TryNextMirror: " << Queue->Uri << endl; // inform parent UsedMirror = *nextmirror; Log("Switching mirror"); return true; } if (Debug) clog << "TryNextMirror could not find another mirror to try" << endl; return false; } bool MirrorMethod::InitMirrors() { // if we do not have a MirrorFile, fallback if(!FileExists(MirrorFile)) { // FIXME: fallback to a default mirror here instead // and provide a config option to define that default return _error->Error(_("No mirror file '%s' found "), MirrorFile.c_str()); } // FIXME: make the mirror selection more clever, do not // just use the first one! // BUT: we can not make this random, the mirror has to be // stable accross session, because otherwise we can // get into sync issues (got indexfiles from mirror A, // but packages from mirror B - one might be out of date etc) ifstream in(MirrorFile.c_str()); string s; while (!in.eof()) { getline(in, s); if (s.size() > 0) AllMirrors.push_back(s); } Mirror = AllMirrors[0]; UsedMirror = Mirror; return true; } string MirrorMethod::GetMirrorFileName(string mirror_uri_str) { /* - a mirror_uri_str looks like this: mirror://people.ubuntu.com/~mvo/apt/mirror/mirrors/dists/feisty/Release.gpg - the matching source.list entry deb mirror://people.ubuntu.com/~mvo/apt/mirror/mirrors feisty main - we actually want to go after: http://people.ubuntu.com/~mvo/apt/mirror/mirrors And we need to save the BaseUri for later: - mirror://people.ubuntu.com/~mvo/apt/mirror/mirrors FIXME: what if we have two similar prefixes? mirror://people.ubuntu.com/~mvo/mirror mirror://people.ubuntu.com/~mvo/mirror2 then mirror_uri_str looks like: mirror://people.ubuntu.com/~mvo/apt/mirror/dists/feisty/Release.gpg mirror://people.ubuntu.com/~mvo/apt/mirror2/dists/feisty/Release.gpg we search sources.list and find: mirror://people.ubuntu.com/~mvo/apt/mirror in both cases! So we need to apply some domain knowledge here :( and check for /dists/ or /Release.gpg as suffixes */ string name; if(Debug) std::cerr << "GetMirrorFileName: " << mirror_uri_str << std::endl; // read sources.list and find match vector<metaIndex *>::const_iterator I; pkgSourceList list; list.ReadMainList(); for(I=list.begin(); I != list.end(); I++) { string uristr = (*I)->GetURI(); if(Debug) std::cerr << "Checking: " << uristr << std::endl; if(uristr.substr(0,strlen("mirror://")) != string("mirror://")) continue; // find matching uri in sources.list if(mirror_uri_str.substr(0,uristr.size()) == uristr) { if(Debug) std::cerr << "found BaseURI: " << uristr << std::endl; BaseUri = uristr.substr(0,uristr.size()-1); } } // get new file name = _config->FindDir("Dir::State::mirrors") + URItoFileName(BaseUri); if(Debug) { cerr << "base-uri: " << BaseUri << endl; cerr << "mirror-file: " << name << endl; } return name; } // MirrorMethod::Fetch - Fetch an item /*{{{*/ // --------------------------------------------------------------------- /* This adds an item to the pipeline. We keep the pipeline at a fixed depth. */ bool MirrorMethod::Fetch(FetchItem *Itm) { if(Debug) clog << "MirrorMethod::Fetch()" << endl; // the http method uses Fetch(0) as a way to update the pipeline, // just let it do its work in this case - Fetch() with a valid // Itm will always run before the first Fetch(0) if(Itm == NULL) return HttpMethod::Fetch(Itm); // if we don't have the name of the mirror file on disk yet, // calculate it now (can be derived from the uri) if(MirrorFile.empty()) MirrorFile = GetMirrorFileName(Itm->Uri); // download mirror file once (if we are after index files) if(Itm->IndexFile && !DownloadedMirrorFile) { Clean(_config->FindDir("Dir::State::mirrors")); DownloadMirrorFile(Itm->Uri); RandomizeMirrorFile(MirrorFile); } if(AllMirrors.empty()) { if(!InitMirrors()) { // no valid mirror selected, something went wrong downloading // from the master mirror site most likely and there is // no old mirror file availalbe return false; } } if(Itm->Uri.find("mirror://") != string::npos) Itm->Uri.replace(0,BaseUri.size(), Mirror); if(Debug) clog << "Fetch: " << Itm->Uri << endl << endl; // now run the real fetcher return HttpMethod::Fetch(Itm); }; void MirrorMethod::Fail(string Err,bool Transient) { // FIXME: TryNextMirror is not ideal for indexfile as we may // run into auth issues if (Debug) clog << "Failure to get " << Queue->Uri << endl; // try the next mirror on fail (if its not a expected failure, // e.g. translations are ok to ignore) if (!Queue->FailIgnore && TryNextMirror()) return; // all mirrors failed, so bail out string s; strprintf(s, _("[Mirror: %s]"), Mirror.c_str()); SetIP(s); CurrentQueueUriToMirror(); pkgAcqMethod::Fail(Err, Transient); } void MirrorMethod::URIStart(FetchResult &Res) { CurrentQueueUriToMirror(); pkgAcqMethod::URIStart(Res); } void MirrorMethod::URIDone(FetchResult &Res,FetchResult *Alt) { CurrentQueueUriToMirror(); pkgAcqMethod::URIDone(Res, Alt); } int main() { setlocale(LC_ALL, ""); MirrorMethod Mth; return Mth.Loop(); }