methods/mirror.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: mirror.cc,v 1.59 2004/05/08 19:42:35 mdz Exp $
   4 /* ######################################################################
   5
   6    Mirror Aquire Method - This is the Mirror aquire method for APT.
   7
   8    ##################################################################### */
   9                                                                         /*}}}*/
  10 // Include Files                                                        /*{{{*/
  11 #include <apt-pkg/fileutl.h>
  12 #include <apt-pkg/acquire-method.h>
  13 #include <apt-pkg/acquire-item.h>
  14 #include <apt-pkg/acquire.h>
  15 #include <apt-pkg/error.h>
  16 #include <apt-pkg/hashes.h>
  17
  18 #include <fstream>
  19 #include <iostream>
  20 #include <stdarg.h>
  21 #include <sys/stat.h>
  22
  23 using namespace std;
  24
  25 #include "mirror.h"
  26 #include "http.h"
  27
  28                                                                         /*}}}*/
  29
  30 /*
  31  * TODO:
  32  * - send expected checksum to the mirror method so that
  33      some checking/falling back can be done here already
  34  * - keep the mirror file around in /var/lib/apt/mirrors
  35      * can't be put into lists/ because of the listclearer
  36      * cleanup by time (mtime relative to the other mtimes)
  37  * - use a TTL time the mirror file is fetched again (6h?)
  38  * - deal with runing as non-root because we can't write to the lists
  39      dir then -> use the cached mirror file
  40  * - better method to download than having a pkgAcquire interface here
  41  * - magicmarker is (a bit) evil
  42  * - testing :)
  43  */
  44
  45 MirrorMethod::MirrorMethod()
  46    : HttpMethod(), HasMirrorFile(false)
  47 {
  48 #if 0
  49    HasMirrorFile=true;
  50    BaseUri="mirror://people.ubuntu.com/~mvo/mirror/mirrors";
  51    MirrorFile="/var/lib/apt/lists/people.ubuntu.com_%7emvo_apt_mirror_mirrors";
  52    Mirror="http://de.archive.ubuntu.com/ubuntu/";
  53 #endif
  54 };
  55
  56 // HttpMethod::Configuration - Handle a configuration message           /*{{{*/
  57 // ---------------------------------------------------------------------
  58 /* We stash the desired pipeline depth */
  59 bool MirrorMethod::Configuration(string Message)
  60 {
  61    if (pkgAcqMethod::Configuration(Message) == false)
  62       return false;
  63    Debug = _config->FindB("Debug::Acquire::mirror",false);
  64
  65    return true;
  66 }
  67                                                                         /*}}}*/
  68
  69 // clean the mirrors dir based on ttl information
  70 bool MirrorMethod::Clean(string dir)
  71 {
  72
  73 }
  74
  75
  76 bool MirrorMethod::GetMirrorFile(string uri)
  77 {
  78    string Marker = _config->Find("Acquire::Mirror::MagicMarker","///");
  79    BaseUri = uri.substr(0,uri.find(Marker));
  80
  81    string fetch = BaseUri;
  82    fetch.replace(0,strlen("mirror://"),"http://");
  83
  84    MirrorFile = _config->FindDir("Dir::State::mirrors") + URItoFileName(BaseUri);
  85
  86    if(Debug)
  87    {
  88       cerr << "base-uri: " << BaseUri << endl;
  89       cerr << "mirror-file: " << MirrorFile << endl;
  90    }
  91
  92    // check the file, if it is not older than RefreshInterval just use it
  93    // otherwise try to get a new one
  94    if(FileExists(MirrorFile))
  95    {
  96       struct stat buf;
  97       time_t t,now,refresh;
  98       if(stat(MirrorFile.c_str(), &buf) != 0)
  99          return false;
 100       t = std::max(buf.st_mtime, buf.st_ctime);
 101       now = time(NULL);
 102       refresh = 60*_config->FindI("Acquire::Mirror::RefreshInterval",360);
 103       if(t + refresh > now)
 104       {
 105          if(Debug)
 106             clog << "Mirror file is in RefreshInterval" << endl;
 107          HasMirrorFile = true;
 108          return true;
 109       }
 110       if(Debug)
 111          clog << "Mirror file " << MirrorFile << " older than " << refresh << ", re-download it" << endl;
 112    }
 113
 114    // not that great to use pkgAcquire here, but we do not have
 115    // any other way right now
 116    pkgAcquire Fetcher;
 117    new pkgAcqFile(&Fetcher, fetch, "", 0, "", "", "", MirrorFile);
 118    bool res = (Fetcher.Run() == pkgAcquire::Continue);
 119    if(res)
 120       HasMirrorFile = true;
 121    Fetcher.Shutdown();
 122    return res;
 123 }
 124
 125 bool MirrorMethod::SelectMirror()
 126 {
 127    // FIXME: make the mirror selection more clever, do not
 128    //        just use the first one!
 129    ifstream in(MirrorFile.c_str());
 130    getline(in, Mirror);
 131    if(Debug)
 132       cerr << "Using mirror: " << Mirror << endl;
 133    return true;
 134 }
 135
 136 // MirrorMethod::Fetch - Fetch an item                                  /*{{{*/
 137 // ---------------------------------------------------------------------
 138 /* This adds an item to the pipeline. We keep the pipeline at a fixed
 139    depth. */
 140 bool MirrorMethod::Fetch(FetchItem *Itm)
 141 {
 142    // select mirror only once per session
 143    if(!HasMirrorFile)
 144    {
 145       GetMirrorFile(Itm->Uri);
 146       SelectMirror();
 147    }
 148
 149    for (FetchItem *I = Queue; I != 0; I = I->Next)
 150    {
 151       if(I->Uri.find("mirror://") != string::npos)
 152          I->Uri.replace(0,BaseUri.size(),Mirror);
 153    }
 154
 155    // now run the real fetcher
 156    return HttpMethod::Fetch(Itm);
 157 };
 158
 159 void MirrorMethod::Fail(string Err,bool Transient)
 160 {
 161    if(Queue->Uri.find("http://") != string::npos)
 162       Queue->Uri.replace(0,Mirror.size(), BaseUri);
 163    pkgAcqMethod::Fail(Err, Transient);
 164 }
 165
 166 void MirrorMethod::URIStart(FetchResult &Res)
 167 {
 168    if(Queue->Uri.find("http://") != string::npos)
 169       Queue->Uri.replace(0,Mirror.size(), BaseUri);
 170    pkgAcqMethod::URIStart(Res);
 171 }
 172
 173 void MirrorMethod::URIDone(FetchResult &Res,FetchResult *Alt)
 174 {
 175    if(Queue->Uri.find("http://") != string::npos)
 176       Queue->Uri.replace(0,Mirror.size(), BaseUri);
 177    pkgAcqMethod::URIDone(Res, Alt);
 178 }
 179
 180
 181 int main()
 182 {
 183    setlocale(LC_ALL, "");
 184
 185    MirrorMethod Mth;
 186
 187    return Mth.Loop();
 188 }
 189
 190