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 #include <apt-pkg/sourcelist.h>
  18
  19 #include <fstream>
  20 #include <iostream>
  21 #include <stdarg.h>
  22 #include <sys/stat.h>
  23 #include <sys/types.h>
  24 #include <dirent.h>
  25
  26 using namespace std;
  27
  28 #include "mirror.h"
  29 #include "http.h"
  30 #include "apti18n.h"
  31                                                                         /*}}}*/
  32
  33 /*
  34  * TODO:
  35  * - send expected checksum to the mirror method so that
  36      some checking/falling back can be done here already
  37  * - keep the mirror file around in /var/lib/apt/mirrors
  38      * can't be put into lists/ because of the listclearer
  39      * cleanup by time (mtime relative to the other mtimes)
  40  * - use a TTL time the mirror file is fetched again (6h?)
  41  * - deal with runing as non-root because we can't write to the lists
  42      dir then -> use the cached mirror file
  43  * - better method to download than having a pkgAcquire interface here
  44  * - magicmarker is (a bit) evil
  45  * - testing :)
  46  */
  47
  48 MirrorMethod::MirrorMethod()
  49    : HttpMethod(), HasMirrorFile(false)
  50 {
  51 #if 0
  52    HasMirrorFile=true;
  53    BaseUri="mirror://people.ubuntu.com/~mvo/mirror/mirrors";
  54    MirrorFile="/var/lib/apt/lists/people.ubuntu.com_%7emvo_apt_mirror_mirrors";
  55    Mirror="http://de.archive.ubuntu.com/ubuntu/";
  56 #endif
  57 };
  58
  59 // HttpMethod::Configuration - Handle a configuration message           /*{{{*/
  60 // ---------------------------------------------------------------------
  61 /* We stash the desired pipeline depth */
  62 bool MirrorMethod::Configuration(string Message)
  63 {
  64    if (pkgAcqMethod::Configuration(Message) == false)
  65       return false;
  66    Debug = _config->FindB("Debug::Acquire::mirror",false);
  67
  68    return true;
  69 }
  70                                                                         /*}}}*/
  71
  72 // clean the mirrors dir based on ttl information
  73 bool MirrorMethod::Clean(string Dir)
  74 {
  75    vector<metaIndex *>::const_iterator I;
  76
  77    if(Debug)
  78       clog << "MirrorMethod::Clean(): " << Dir << endl;
  79
  80    // read sources.list
  81    pkgSourceList list;
  82    list.ReadMainList();
  83
  84    DIR *D = opendir(Dir.c_str());
  85    if (D == 0)
  86       return _error->Errno("opendir",_("Unable to read %s"),Dir.c_str());
  87
  88    string StartDir = SafeGetCWD();
  89    if (chdir(Dir.c_str()) != 0)
  90    {
  91       closedir(D);
  92       return _error->Errno("chdir",_("Unable to change to %s"),Dir.c_str());
  93    }
  94
  95    for (struct dirent *Dir = readdir(D); Dir != 0; Dir = readdir(D))
  96    {
  97       // Skip some files..
  98       if (strcmp(Dir->d_name,"lock") == 0 ||
  99           strcmp(Dir->d_name,"partial") == 0 ||
 100           strcmp(Dir->d_name,".") == 0 ||
 101           strcmp(Dir->d_name,"..") == 0)
 102          continue;
 103
 104       // see if we have that uri
 105       for(I=list.begin(); I != list.end(); I++)
 106       {
 107          string uri = (*I)->GetURI();
 108          if(uri.substr(0,strlen("mirror://")) != string("mirror://"))
 109             continue;
 110          string Marker = _config->Find("Acquire::Mirror::MagicMarker","///");
 111          string BaseUri = uri.substr(0,uri.find(Marker));
 112          if (URItoFileName(BaseUri) == Dir->d_name)
 113             break;
 114       }
 115       // nothing found, nuke it
 116       if (I == list.end())
 117          unlink(Dir->d_name);
 118    };
 119
 120    chdir(StartDir.c_str());
 121    closedir(D);
 122    return true;
 123 }
 124
 125
 126 bool MirrorMethod::GetMirrorFile(string uri)
 127 {
 128    string Marker = _config->Find("Acquire::Mirror::MagicMarker","///");
 129    BaseUri = uri.substr(0,uri.find(Marker));
 130
 131    string fetch = BaseUri;
 132    fetch.replace(0,strlen("mirror://"),"http://");
 133
 134    // get new file
 135    MirrorFile = _config->FindDir("Dir::State::mirrors") + URItoFileName(BaseUri);
 136
 137    if(Debug)
 138    {
 139       cerr << "base-uri: " << BaseUri << endl;
 140       cerr << "mirror-file: " << MirrorFile << endl;
 141    }
 142
 143    // check the file, if it is not older than RefreshInterval just use it
 144    // otherwise try to get a new one
 145    if(FileExists(MirrorFile))
 146    {
 147       struct stat buf;
 148       time_t t,now,refresh;
 149       if(stat(MirrorFile.c_str(), &buf) != 0)
 150          return false;
 151       t = std::max(buf.st_mtime, buf.st_ctime);
 152       now = time(NULL);
 153       refresh = 60*_config->FindI("Acquire::Mirror::RefreshInterval",360);
 154       if(t + refresh > now)
 155       {
 156          if(Debug)
 157             clog << "Mirror file is in RefreshInterval" << endl;
 158          HasMirrorFile = true;
 159          return true;
 160       }
 161       if(Debug)
 162          clog << "Mirror file " << MirrorFile << " older than " << refresh << "min, re-download it" << endl;
 163    }
 164
 165    // not that great to use pkgAcquire here, but we do not have
 166    // any other way right now
 167    pkgAcquire Fetcher;
 168    new pkgAcqFile(&Fetcher, fetch, "", 0, "", "", "", MirrorFile);
 169    bool res = (Fetcher.Run() == pkgAcquire::Continue);
 170    if(res)
 171       HasMirrorFile = true;
 172    Fetcher.Shutdown();
 173    return res;
 174 }
 175
 176 bool MirrorMethod::SelectMirror()
 177 {
 178    // FIXME: make the mirror selection more clever, do not
 179    //        just use the first one!
 180    ifstream in(MirrorFile.c_str());
 181    getline(in, Mirror);
 182    if(Debug)
 183       cerr << "Using mirror: " << Mirror << endl;
 184    return true;
 185 }
 186
 187 // MirrorMethod::Fetch - Fetch an item                                  /*{{{*/
 188 // ---------------------------------------------------------------------
 189 /* This adds an item to the pipeline. We keep the pipeline at a fixed
 190    depth. */
 191 bool MirrorMethod::Fetch(FetchItem *Itm)
 192 {
 193    // select mirror only once per session
 194    if(!HasMirrorFile)
 195    {
 196       Clean(_config->FindDir("Dir::State::mirrors"));
 197       GetMirrorFile(Itm->Uri);
 198       SelectMirror();
 199    }
 200
 201    for (FetchItem *I = Queue; I != 0; I = I->Next)
 202    {
 203       if(I->Uri.find("mirror://") != string::npos)
 204          I->Uri.replace(0,BaseUri.size(),Mirror);
 205    }
 206
 207    // now run the real fetcher
 208    return HttpMethod::Fetch(Itm);
 209 };
 210
 211 void MirrorMethod::Fail(string Err,bool Transient)
 212 {
 213    if(Queue->Uri.find("http://") != string::npos)
 214       Queue->Uri.replace(0,Mirror.size(), BaseUri);
 215    pkgAcqMethod::Fail(Err, Transient);
 216 }
 217
 218 void MirrorMethod::URIStart(FetchResult &Res)
 219 {
 220    if(Queue->Uri.find("http://") != string::npos)
 221       Queue->Uri.replace(0,Mirror.size(), BaseUri);
 222    pkgAcqMethod::URIStart(Res);
 223 }
 224
 225 void MirrorMethod::URIDone(FetchResult &Res,FetchResult *Alt)
 226 {
 227    if(Queue->Uri.find("http://") != string::npos)
 228       Queue->Uri.replace(0,Mirror.size(), BaseUri);
 229    pkgAcqMethod::URIDone(Res, Alt);
 230 }
 231
 232
 233 int main()
 234 {
 235    setlocale(LC_ALL, "");
 236
 237    MirrorMethod Mth;
 238
 239    return Mth.Loop();
 240 }
 241
 242