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 #include <sys/types.h>
  23 #include <dirent.h>
  24
  25 using namespace std;
  26
  27 #include "mirror.h"
  28 #include "http.h"
  29 #include "apti18n.h"
  30                                                                         /*}}}*/
  31
  32 /*
  33  * TODO:
  34  * - send expected checksum to the mirror method so that
  35      some checking/falling back can be done here already
  36  * - keep the mirror file around in /var/lib/apt/mirrors
  37      * can't be put into lists/ because of the listclearer
  38      * cleanup by time (mtime relative to the other mtimes)
  39  * - use a TTL time the mirror file is fetched again (6h?)
  40  * - deal with runing as non-root because we can't write to the lists
  41      dir then -> use the cached mirror file
  42  * - better method to download than having a pkgAcquire interface here
  43  * - magicmarker is (a bit) evil
  44  * - testing :)
  45  */
  46
  47 MirrorMethod::MirrorMethod()
  48    : HttpMethod(), HasMirrorFile(false)
  49 {
  50 #if 0
  51    HasMirrorFile=true;
  52    BaseUri="mirror://people.ubuntu.com/~mvo/mirror/mirrors";
  53    MirrorFile="/var/lib/apt/lists/people.ubuntu.com_%7emvo_apt_mirror_mirrors";
  54    Mirror="http://de.archive.ubuntu.com/ubuntu/";
  55 #endif
  56 };
  57
  58 // HttpMethod::Configuration - Handle a configuration message           /*{{{*/
  59 // ---------------------------------------------------------------------
  60 /* We stash the desired pipeline depth */
  61 bool MirrorMethod::Configuration(string Message)
  62 {
  63    if (pkgAcqMethod::Configuration(Message) == false)
  64       return false;
  65    Debug = _config->FindB("Debug::Acquire::mirror",false);
  66
  67    return true;
  68 }
  69                                                                         /*}}}*/
  70
  71 // clean the mirrors dir based on ttl information
  72 bool MirrorMethod::Clean(string Dir)
  73 {
  74    // FIXME: it would better to have a global idea of the mirrors
  75    //        in the sources.list and use this instead of this time
  76    //        based approach. currently apt does not support this :/
  77
  78    DIR *D = opendir(Dir.c_str());
  79    if (D == 0)
  80       return _error->Errno("opendir",_("Unable to read %s"),Dir.c_str());
  81
  82    string StartDir = SafeGetCWD();
  83    if (chdir(Dir.c_str()) != 0)
  84    {
  85       closedir(D);
  86       return _error->Errno("chdir",_("Unable to change to %s"),Dir.c_str());
  87    }
  88
  89    for (struct dirent *Dir = readdir(D); Dir != 0; Dir = readdir(D))
  90    {
  91       // Skip some files..
  92       if (strcmp(Dir->d_name,"lock") == 0 ||
  93           strcmp(Dir->d_name,"partial") == 0 ||
  94           strcmp(Dir->d_name,".") == 0 ||
  95           strcmp(Dir->d_name,"..") == 0)
  96          continue;
  97
  98       // Del everything not touched for MaxAge days
  99       time_t t,now,max;
 100       struct stat buf;
 101       if(stat(Dir->d_name, &buf) != 0)
 102       {
 103          cerr << "Can't stat '" << Dir->d_name << "'" << endl;
 104          continue;
 105       }
 106       t = std::max(buf.st_mtime, buf.st_ctime);
 107       now = time(NULL);
 108       max = 24*60*60*_config->FindI("Acquire::Mirror::MaxAge",90);
 109       if(t + max < now)
 110       {
 111          if(Debug)
 112             clog << "Mirror file is older than MaxAge days, deleting" << endl;
 113          unlink(Dir->d_name);
 114       }
 115    };
 116
 117    chdir(StartDir.c_str());
 118    closedir(D);
 119    return true;
 120 }
 121
 122
 123 bool MirrorMethod::GetMirrorFile(string uri)
 124 {
 125    string Marker = _config->Find("Acquire::Mirror::MagicMarker","///");
 126    BaseUri = uri.substr(0,uri.find(Marker));
 127
 128    string fetch = BaseUri;
 129    fetch.replace(0,strlen("mirror://"),"http://");
 130
 131    // get new file
 132    MirrorFile = _config->FindDir("Dir::State::mirrors") + URItoFileName(BaseUri);
 133
 134    if(Debug)
 135    {
 136       cerr << "base-uri: " << BaseUri << endl;
 137       cerr << "mirror-file: " << MirrorFile << endl;
 138    }
 139
 140    // check the file, if it is not older than RefreshInterval just use it
 141    // otherwise try to get a new one
 142    if(FileExists(MirrorFile))
 143    {
 144       struct stat buf;
 145       time_t t,now,refresh;
 146       if(stat(MirrorFile.c_str(), &buf) != 0)
 147          return false;
 148       t = std::max(buf.st_mtime, buf.st_ctime);
 149       now = time(NULL);
 150       refresh = 60*_config->FindI("Acquire::Mirror::RefreshInterval",360);
 151       if(t + refresh > now)
 152       {
 153          if(Debug)
 154             clog << "Mirror file is in RefreshInterval" << endl;
 155          HasMirrorFile = true;
 156          return true;
 157       }
 158       if(Debug)
 159          clog << "Mirror file " << MirrorFile << " older than " << refresh << "min, re-download it" << endl;
 160    }
 161
 162    // not that great to use pkgAcquire here, but we do not have
 163    // any other way right now
 164    pkgAcquire Fetcher;
 165    new pkgAcqFile(&Fetcher, fetch, "", 0, "", "", "", MirrorFile);
 166    bool res = (Fetcher.Run() == pkgAcquire::Continue);
 167    if(res)
 168       HasMirrorFile = true;
 169    Fetcher.Shutdown();
 170    return res;
 171 }
 172
 173 bool MirrorMethod::SelectMirror()
 174 {
 175    // FIXME: make the mirror selection more clever, do not
 176    //        just use the first one!
 177    ifstream in(MirrorFile.c_str());
 178    getline(in, Mirror);
 179    if(Debug)
 180       cerr << "Using mirror: " << Mirror << endl;
 181    return true;
 182 }
 183
 184 // MirrorMethod::Fetch - Fetch an item                                  /*{{{*/
 185 // ---------------------------------------------------------------------
 186 /* This adds an item to the pipeline. We keep the pipeline at a fixed
 187    depth. */
 188 bool MirrorMethod::Fetch(FetchItem *Itm)
 189 {
 190    // select mirror only once per session
 191    if(!HasMirrorFile)
 192    {
 193       Clean(_config->FindDir("Dir::State::mirrors"));
 194       GetMirrorFile(Itm->Uri);
 195       SelectMirror();
 196    }
 197
 198    for (FetchItem *I = Queue; I != 0; I = I->Next)
 199    {
 200       if(I->Uri.find("mirror://") != string::npos)
 201          I->Uri.replace(0,BaseUri.size(),Mirror);
 202    }
 203
 204    // now run the real fetcher
 205    return HttpMethod::Fetch(Itm);
 206 };
 207
 208 void MirrorMethod::Fail(string Err,bool Transient)
 209 {
 210    if(Queue->Uri.find("http://") != string::npos)
 211       Queue->Uri.replace(0,Mirror.size(), BaseUri);
 212    pkgAcqMethod::Fail(Err, Transient);
 213 }
 214
 215 void MirrorMethod::URIStart(FetchResult &Res)
 216 {
 217    if(Queue->Uri.find("http://") != string::npos)
 218       Queue->Uri.replace(0,Mirror.size(), BaseUri);
 219    pkgAcqMethod::URIStart(Res);
 220 }
 221
 222 void MirrorMethod::URIDone(FetchResult &Res,FetchResult *Alt)
 223 {
 224    if(Queue->Uri.find("http://") != string::npos)
 225       Queue->Uri.replace(0,Mirror.size(), BaseUri);
 226    pkgAcqMethod::URIDone(Res, Alt);
 227 }
 228
 229
 230 int main()
 231 {
 232    setlocale(LC_ALL, "");
 233
 234    MirrorMethod Mth;
 235
 236    return Mth.Loop();
 237 }
 238
 239