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 /* Done:
  34  * - works with http (only!)
  35  * - always picks the first mirror from the list
  36  * - call out to problem reporting script
  37  * - supports "deb mirror://host/path/to/mirror-list/// dist component"
  38  * - use pkgAcqMethod::FailReason() to have a string representation
  39  *   of the failure that is also send to LP
  40  *
  41  * TODO:
  42  * - deal with runing as non-root because we can't write to the lists
  43      dir then -> use the cached mirror file
  44  * - better method to download than having a pkgAcquire interface here
  45  * - magicmarker is evil, maybe just use a similar approach as in
  46      clean and read the sources.list and use the GetURI() method to find
  47      the prefix?
  48  * support more than http
  49  * - testing :)
  50  */
  51
  52 MirrorMethod::MirrorMethod()
  53    : HttpMethod(), HasMirrorFile(false)
  54 {
  55 #if 0
  56    HasMirrorFile=true;
  57    BaseUri="mirror://people.ubuntu.com/~mvo/mirror/mirrors";
  58    MirrorFile="/var/lib/apt/lists/people.ubuntu.com_%7emvo_apt_mirror_mirrors";
  59    Mirror="http://de.archive.ubuntu.com/ubuntu/";
  60 #endif
  61 };
  62
  63 // HttpMethod::Configuration - Handle a configuration message           /*{{{*/
  64 // ---------------------------------------------------------------------
  65 /* We stash the desired pipeline depth */
  66 bool MirrorMethod::Configuration(string Message)
  67 {
  68    if (pkgAcqMethod::Configuration(Message) == false)
  69       return false;
  70    Debug = _config->FindB("Debug::Acquire::mirror",false);
  71
  72    return true;
  73 }
  74                                                                         /*}}}*/
  75
  76 // clean the mirrors dir based on ttl information
  77 bool MirrorMethod::Clean(string Dir)
  78 {
  79    vector<metaIndex *>::const_iterator I;
  80
  81    if(Debug)
  82       clog << "MirrorMethod::Clean(): " << Dir << endl;
  83
  84    // read sources.list
  85    pkgSourceList list;
  86    list.ReadMainList();
  87
  88    DIR *D = opendir(Dir.c_str());
  89    if (D == 0)
  90       return _error->Errno("opendir",_("Unable to read %s"),Dir.c_str());
  91
  92    string StartDir = SafeGetCWD();
  93    if (chdir(Dir.c_str()) != 0)
  94    {
  95       closedir(D);
  96       return _error->Errno("chdir",_("Unable to change to %s"),Dir.c_str());
  97    }
  98
  99    for (struct dirent *Dir = readdir(D); Dir != 0; Dir = readdir(D))
 100    {
 101       // Skip some files..
 102       if (strcmp(Dir->d_name,"lock") == 0 ||
 103           strcmp(Dir->d_name,"partial") == 0 ||
 104           strcmp(Dir->d_name,".") == 0 ||
 105           strcmp(Dir->d_name,"..") == 0)
 106          continue;
 107
 108       // see if we have that uri
 109       for(I=list.begin(); I != list.end(); I++)
 110       {
 111          string uri = (*I)->GetURI();
 112          if(uri.substr(0,strlen("mirror://")) != string("mirror://"))
 113             continue;
 114          string Marker = _config->Find("Acquire::Mirror::MagicMarker","///");
 115          string BaseUri = uri.substr(0,uri.find(Marker));
 116          if (URItoFileName(BaseUri) == Dir->d_name)
 117             break;
 118       }
 119       // nothing found, nuke it
 120       if (I == list.end())
 121          unlink(Dir->d_name);
 122    };
 123
 124    chdir(StartDir.c_str());
 125    closedir(D);
 126    return true;
 127 }
 128
 129
 130 bool MirrorMethod::GetMirrorFile(string uri)
 131 {
 132    string Marker = _config->Find("Acquire::Mirror::MagicMarker","///");
 133    BaseUri = uri.substr(0,uri.find(Marker));
 134
 135    string fetch = BaseUri;
 136    fetch.replace(0,strlen("mirror://"),"http://");
 137
 138    // get new file
 139    MirrorFile = _config->FindDir("Dir::State::mirrors") + URItoFileName(BaseUri);
 140
 141    if(Debug)
 142    {
 143       cerr << "base-uri: " << BaseUri << endl;
 144       cerr << "mirror-file: " << MirrorFile << endl;
 145    }
 146
 147    // check the file, if it is not older than RefreshInterval just use it
 148    // otherwise try to get a new one
 149    if(FileExists(MirrorFile))
 150    {
 151       struct stat buf;
 152       time_t t,now,refresh;
 153       if(stat(MirrorFile.c_str(), &buf) != 0)
 154          return false;
 155       t = std::max(buf.st_mtime, buf.st_ctime);
 156       now = time(NULL);
 157       refresh = 60*_config->FindI("Acquire::Mirror::RefreshInterval",360);
 158       if(t + refresh > now)
 159       {
 160          if(Debug)
 161             clog << "Mirror file is in RefreshInterval" << endl;
 162          HasMirrorFile = true;
 163          return true;
 164       }
 165       if(Debug)
 166          clog << "Mirror file " << MirrorFile << " older than " << refresh << "min, re-download it" << endl;
 167    }
 168
 169    // not that great to use pkgAcquire here, but we do not have
 170    // any other way right now
 171    pkgAcquire Fetcher;
 172    new pkgAcqFile(&Fetcher, fetch, "", 0, "", "", "", MirrorFile);
 173    bool res = (Fetcher.Run() == pkgAcquire::Continue);
 174    if(res)
 175       HasMirrorFile = true;
 176    Fetcher.Shutdown();
 177    return res;
 178 }
 179
 180 bool MirrorMethod::SelectMirror()
 181 {
 182    // FIXME: make the mirror selection more clever, do not
 183    //        just use the first one!
 184    ifstream in(MirrorFile.c_str());
 185    getline(in, Mirror);
 186    if(Debug)
 187       cerr << "Using mirror: " << Mirror << endl;
 188
 189    UsedMirror = Mirror;
 190    return true;
 191 }
 192
 193 // MirrorMethod::Fetch - Fetch an item                                  /*{{{*/
 194 // ---------------------------------------------------------------------
 195 /* This adds an item to the pipeline. We keep the pipeline at a fixed
 196    depth. */
 197 bool MirrorMethod::Fetch(FetchItem *Itm)
 198 {
 199    // select mirror only once per session
 200    if(!HasMirrorFile)
 201    {
 202       Clean(_config->FindDir("Dir::State::mirrors"));
 203       GetMirrorFile(Itm->Uri);
 204       SelectMirror();
 205    }
 206
 207    for (FetchItem *I = Queue; I != 0; I = I->Next)
 208    {
 209       if(I->Uri.find("mirror://") != string::npos)
 210          I->Uri.replace(0,BaseUri.size(),Mirror);
 211    }
 212
 213    // now run the real fetcher
 214    return HttpMethod::Fetch(Itm);
 215 };
 216
 217 void MirrorMethod::Fail(string Err,bool Transient)
 218 {
 219    if(Queue->Uri.find("http://") != string::npos)
 220       Queue->Uri.replace(0,Mirror.size(), BaseUri);
 221    pkgAcqMethod::Fail(Err, Transient);
 222 }
 223
 224 void MirrorMethod::URIStart(FetchResult &Res)
 225 {
 226    if(Queue->Uri.find("http://") != string::npos)
 227       Queue->Uri.replace(0,Mirror.size(), BaseUri);
 228    pkgAcqMethod::URIStart(Res);
 229 }
 230
 231 void MirrorMethod::URIDone(FetchResult &Res,FetchResult *Alt)
 232 {
 233    if(Queue->Uri.find("http://") != string::npos)
 234       Queue->Uri.replace(0,Mirror.size(), BaseUri);
 235    pkgAcqMethod::URIDone(Res, Alt);
 236 }
 237
 238
 239 int main()
 240 {
 241    setlocale(LC_ALL, "");
 242
 243    MirrorMethod Mth;
 244
 245    return Mth.Loop();
 246 }
 247
 248