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+// -*- mode: cpp; mode: fold -*-
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+// Description /*{{{*/
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+// $Id: mirror.cc,v 1.59 2004/05/08 19:42:35 mdz Exp $
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+/* ######################################################################
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+
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+ Mirror Aquire Method - This is the Mirror aquire method for APT.
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+
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+ ##################################################################### */
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+ /*}}}*/
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+// Include Files /*{{{*/
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+#include <apt-pkg/fileutl.h>
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+#include <apt-pkg/acquire-method.h>
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+#include <apt-pkg/acquire-item.h>
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+#include <apt-pkg/acquire.h>
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+#include <apt-pkg/error.h>
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+#include <apt-pkg/hashes.h>
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+#include <apt-pkg/sourcelist.h>
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+
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+#include <fstream>
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+#include <iostream>
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+#include <stdarg.h>
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+#include <sys/stat.h>
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+#include <sys/types.h>
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+#include <dirent.h>
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+
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+using namespace std;
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+
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+#include "mirror.h"
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+#include "http.h"
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+#include "apti18n.h"
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+ /*}}}*/
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+
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+/* Done:
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+ * - works with http (only!)
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+ * - always picks the first mirror from the list
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+ * - call out to problem reporting script
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+ * - supports "deb mirror://host/path/to/mirror-list/// dist component"
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+ * - uses pkgAcqMethod::FailReason() to have a string representation
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+ * of the failure that is also send to LP
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+ *
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+ * TODO:
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+ * - deal with runing as non-root because we can't write to the lists
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+ dir then -> use the cached mirror file
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+ * - better method to download than having a pkgAcquire interface here
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+ * and better error handling there!
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+ * - support more than http
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+ * - testing :)
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+ */
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+
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+MirrorMethod::MirrorMethod()
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+ : HttpMethod(), DownloadedMirrorFile(false)
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+{
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+};
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+
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+// HttpMethod::Configuration - Handle a configuration message /*{{{*/
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+// ---------------------------------------------------------------------
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+/* We stash the desired pipeline depth */
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+bool MirrorMethod::Configuration(string Message)
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+{
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+ if (pkgAcqMethod::Configuration(Message) == false)
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+ return false;
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+ Debug = _config->FindB("Debug::Acquire::mirror",false);
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+
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+ return true;
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+}
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+ /*}}}*/
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+
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+// clean the mirrors dir based on ttl information
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+bool MirrorMethod::Clean(string Dir)
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+{
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+ vector<metaIndex *>::const_iterator I;
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+
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+ if(Debug)
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+ clog << "MirrorMethod::Clean(): " << Dir << endl;
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+
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+ if(Dir == "/")
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+ return _error->Error("will not clean: '/'");
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+
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+ // read sources.list
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+ pkgSourceList list;
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+ list.ReadMainList();
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+
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+ DIR *D = opendir(Dir.c_str());
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+ if (D == 0)
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+ return _error->Errno("opendir",_("Unable to read %s"),Dir.c_str());
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+
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+ string StartDir = SafeGetCWD();
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+ if (chdir(Dir.c_str()) != 0)
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+ {
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+ closedir(D);
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+ return _error->Errno("chdir",_("Unable to change to %s"),Dir.c_str());
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+ }
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+
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+ for (struct dirent *Dir = readdir(D); Dir != 0; Dir = readdir(D))
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+ {
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+ // Skip some files..
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+ if (strcmp(Dir->d_name,"lock") == 0 ||
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+ strcmp(Dir->d_name,"partial") == 0 ||
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+ strcmp(Dir->d_name,".") == 0 ||
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+ strcmp(Dir->d_name,"..") == 0)
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+ continue;
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+
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+ // see if we have that uri
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+ for(I=list.begin(); I != list.end(); I++)
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+ {
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+ string uri = (*I)->GetURI();
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+ if(uri.substr(0,strlen("mirror://")) != string("mirror://"))
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+ continue;
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+ string BaseUri = uri.substr(0,uri.size()-1);
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+ if (URItoFileName(BaseUri) == Dir->d_name)
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+ break;
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+ }
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+ // nothing found, nuke it
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+ if (I == list.end())
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+ unlink(Dir->d_name);
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+ };
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+
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+ chdir(StartDir.c_str());
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+ closedir(D);
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+ return true;
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+}
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+
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+
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+bool MirrorMethod::DownloadMirrorFile(string mirror_uri_str)
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+{
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+ if(Debug)
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+ clog << "MirrorMethod::DownloadMirrorFile(): " << endl;
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+
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+ // check the file, if it is not older than RefreshInterval just use it
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+ // otherwise try to get a new one
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+ if(FileExists(MirrorFile))
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+ {
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+ struct stat buf;
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+ time_t t,now,refresh;
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+ if(stat(MirrorFile.c_str(), &buf) != 0)
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+ return false;
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+ t = std::max(buf.st_mtime, buf.st_ctime);
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+ now = time(NULL);
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+ refresh = 60*_config->FindI("Acquire::Mirror::RefreshInterval",360);
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+ if(t + refresh > now)
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+ {
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+ if(Debug)
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+ clog << "Mirror file is in RefreshInterval" << endl;
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+ DownloadedMirrorFile = true;
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+ return true;
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+ }
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+ if(Debug)
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+ clog << "Mirror file " << MirrorFile << " older than " << refresh << "min, re-download it" << endl;
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+ }
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+
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+ // not that great to use pkgAcquire here, but we do not have
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+ // any other way right now
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+ string fetch = BaseUri;
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+ fetch.replace(0,strlen("mirror://"),"http://");
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+
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+ pkgAcquire Fetcher;
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+ new pkgAcqFile(&Fetcher, fetch, "", 0, "", "", "", MirrorFile);
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+ bool res = (Fetcher.Run() == pkgAcquire::Continue);
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+ if(res)
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+ DownloadedMirrorFile = true;
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+ Fetcher.Shutdown();
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+ return res;
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+}
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+
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+bool MirrorMethod::SelectMirror()
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+{
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+ // if we do not have a MirrorFile, fallback
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+ if(!FileExists(MirrorFile))
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+ {
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+ // FIXME: fallback to a default mirror here instead
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+ // and provide a config option to define that default
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+ return _error->Error(_("No mirror file '%s' found "), MirrorFile.c_str());
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+ }
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+
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+ // FIXME: make the mirror selection more clever, do not
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+ // just use the first one!
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+ // BUT: we can not make this random, the mirror has to be
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+ // stable accross session, because otherwise we can
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+ // get into sync issues (got indexfiles from mirror A,
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+ // but packages from mirror B - one might be out of date etc)
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+ ifstream in(MirrorFile.c_str());
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+ getline(in, Mirror);
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+ if(Debug)
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+ cerr << "Using mirror: " << Mirror << endl;
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+
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+ UsedMirror = Mirror;
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+ return true;
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+}
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+
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+string MirrorMethod::GetMirrorFileName(string mirror_uri_str)
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+{
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+ /*
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+ - a mirror_uri_str looks like this:
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+ mirror://people.ubuntu.com/~mvo/apt/mirror/mirrors/dists/feisty/Release.gpg
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+
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+ - the matching source.list entry
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+ deb mirror://people.ubuntu.com/~mvo/apt/mirror/mirrors feisty main
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+
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+ - we actually want to go after:
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+ http://people.ubuntu.com/~mvo/apt/mirror/mirrors
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+
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+ And we need to save the BaseUri for later:
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+ - mirror://people.ubuntu.com/~mvo/apt/mirror/mirrors
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+
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+ FIXME: what if we have two similar prefixes?
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+ mirror://people.ubuntu.com/~mvo/mirror
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+ mirror://people.ubuntu.com/~mvo/mirror2
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+ then mirror_uri_str looks like:
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+ mirror://people.ubuntu.com/~mvo/apt/mirror/dists/feisty/Release.gpg
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+ mirror://people.ubuntu.com/~mvo/apt/mirror2/dists/feisty/Release.gpg
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+ we search sources.list and find:
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+ mirror://people.ubuntu.com/~mvo/apt/mirror
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+ in both cases! So we need to apply some domain knowledge here :( and
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+ check for /dists/ or /Release.gpg as suffixes
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+ */
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+ string name;
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+ if(Debug)
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+ std::cerr << "GetMirrorFileName: " << mirror_uri_str << std::endl;
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+
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+ // read sources.list and find match
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+ vector<metaIndex *>::const_iterator I;
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+ pkgSourceList list;
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+ list.ReadMainList();
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+ for(I=list.begin(); I != list.end(); I++)
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+ {
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+ string uristr = (*I)->GetURI();
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+ if(Debug)
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+ std::cerr << "Checking: " << uristr << std::endl;
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+ if(uristr.substr(0,strlen("mirror://")) != string("mirror://"))
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+ continue;
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+ // find matching uri in sources.list
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+ if(mirror_uri_str.substr(0,uristr.size()) == uristr)
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+ {
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+ if(Debug)
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+ std::cerr << "found BaseURI: " << uristr << std::endl;
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+ BaseUri = uristr.substr(0,uristr.size()-1);
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+ }
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+ }
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+ // get new file
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+ name = _config->FindDir("Dir::State::mirrors") + URItoFileName(BaseUri);
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+
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+ if(Debug)
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+ {
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+ cerr << "base-uri: " << BaseUri << endl;
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+ cerr << "mirror-file: " << name << endl;
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+ }
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+ return name;
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+}
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+
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+// MirrorMethod::Fetch - Fetch an item /*{{{*/
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+// ---------------------------------------------------------------------
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+/* This adds an item to the pipeline. We keep the pipeline at a fixed
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+ depth. */
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+bool MirrorMethod::Fetch(FetchItem *Itm)
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+{
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+ if(Debug)
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+ clog << "MirrorMethod::Fetch()" << endl;
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+
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+ // the http method uses Fetch(0) as a way to update the pipeline,
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+ // just let it do its work in this case - Fetch() with a valid
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+ // Itm will always run before the first Fetch(0)
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+ if(Itm == NULL)
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+ return HttpMethod::Fetch(Itm);
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+
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+ // if we don't have the name of the mirror file on disk yet,
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+ // calculate it now (can be derived from the uri)
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+ if(MirrorFile.empty())
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+ MirrorFile = GetMirrorFileName(Itm->Uri);
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+
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+ // download mirror file once (if we are after index files)
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+ if(Itm->IndexFile && !DownloadedMirrorFile)
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+ {
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+ Clean(_config->FindDir("Dir::State::mirrors"));
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+ DownloadMirrorFile(Itm->Uri);
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+ }
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+
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+ if(Mirror.empty()) {
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+ if(!SelectMirror()) {
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+ // no valid mirror selected, something went wrong downloading
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+ // from the master mirror site most likely and there is
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+ // no old mirror file availalbe
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+ return false;
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+ }
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+ }
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+ if(Debug)
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+ clog << "selected mirror: " << Mirror << endl;
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+
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+
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+ for (FetchItem *I = Queue; I != 0; I = I->Next)
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+ {
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+ if(I->Uri.find("mirror://") != string::npos)
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+ I->Uri.replace(0,BaseUri.size(), Mirror);
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+ }
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+
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+ // now run the real fetcher
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+ return HttpMethod::Fetch(Itm);
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+};
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+
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+void MirrorMethod::Fail(string Err,bool Transient)
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+{
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+ if(Queue->Uri.find("http://") != string::npos)
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+ Queue->Uri.replace(0,Mirror.size(), BaseUri);
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+ pkgAcqMethod::Fail(Err, Transient);
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+}
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+
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+void MirrorMethod::URIStart(FetchResult &Res)
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+{
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+ if(Queue->Uri.find("http://") != string::npos)
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+ Queue->Uri.replace(0,Mirror.size(), BaseUri);
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+ pkgAcqMethod::URIStart(Res);
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+}
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+
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+void MirrorMethod::URIDone(FetchResult &Res,FetchResult *Alt)
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+{
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+ if(Queue->Uri.find("http://") != string::npos)
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+ Queue->Uri.replace(0,Mirror.size(), BaseUri);
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+ pkgAcqMethod::URIDone(Res, Alt);
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+}
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+
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+
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+int main()
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+{
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+ setlocale(LC_ALL, "");
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+
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+ MirrorMethod Mth;
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+
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+ return Mth.Loop();
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+}
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+
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+
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