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  *
  39  * TODO:
  40  * what about gpgv  failures? this should call-out to the problem reporting
  41    script, but we need to know what mirror was used -> just run pkgAcquire::Item::ReportMirrorFailure()
  42  * better standard format for errors to send back
  43  * - implement failure reporting  at the pkgAcquire::Item::Failed() level
  44      but then we need to send back what uri exactly was failing
  45      [mvo: the problem with this approach is ::Failed() is not really
  46            called for all failures :/ e.g. md5sum mismatch in a archive
  47            is not]
  48  * - deal with runing as non-root because we can't write to the lists
  49      dir then -> use the cached mirror file
  50  * - better method to download than having a pkgAcquire interface here
  51  * - magicmarker is evil, maybe just use a similar approach as in
  52      clean and read the sources.list and use the GetURI() method to find
  53      the prefix?
  54  * support more than http
  55  * - testing :)
  56  */
  57
  58 MirrorMethod::MirrorMethod()
  59    : HttpMethod(), HasMirrorFile(false)
  60 {
  61 #if 0
  62    HasMirrorFile=true;
  63    BaseUri="mirror://people.ubuntu.com/~mvo/mirror/mirrors";
  64    MirrorFile="/var/lib/apt/lists/people.ubuntu.com_%7emvo_apt_mirror_mirrors";
  65    Mirror="http://de.archive.ubuntu.com/ubuntu/";
  66 #endif
  67 };
  68
  69 // HttpMethod::Configuration - Handle a configuration message           /*{{{*/
  70 // ---------------------------------------------------------------------
  71 /* We stash the desired pipeline depth */
  72 bool MirrorMethod::Configuration(string Message)
  73 {
  74    if (pkgAcqMethod::Configuration(Message) == false)
  75       return false;
  76    Debug = _config->FindB("Debug::Acquire::mirror",false);
  77
  78    return true;
  79 }
  80                                                                         /*}}}*/
  81
  82 // clean the mirrors dir based on ttl information
  83 bool MirrorMethod::Clean(string Dir)
  84 {
  85    vector<metaIndex *>::const_iterator I;
  86
  87    if(Debug)
  88       clog << "MirrorMethod::Clean(): " << Dir << endl;
  89
  90    // read sources.list
  91    pkgSourceList list;
  92    list.ReadMainList();
  93
  94    DIR *D = opendir(Dir.c_str());
  95    if (D == 0)
  96       return _error->Errno("opendir",_("Unable to read %s"),Dir.c_str());
  97
  98    string StartDir = SafeGetCWD();
  99    if (chdir(Dir.c_str()) != 0)
 100    {
 101       closedir(D);
 102       return _error->Errno("chdir",_("Unable to change to %s"),Dir.c_str());
 103    }
 104
 105    for (struct dirent *Dir = readdir(D); Dir != 0; Dir = readdir(D))
 106    {
 107       // Skip some files..
 108       if (strcmp(Dir->d_name,"lock") == 0 ||
 109           strcmp(Dir->d_name,"partial") == 0 ||
 110           strcmp(Dir->d_name,".") == 0 ||
 111           strcmp(Dir->d_name,"..") == 0)
 112          continue;
 113
 114       // see if we have that uri
 115       for(I=list.begin(); I != list.end(); I++)
 116       {
 117          string uri = (*I)->GetURI();
 118          if(uri.substr(0,strlen("mirror://")) != string("mirror://"))
 119             continue;
 120          string Marker = _config->Find("Acquire::Mirror::MagicMarker","///");
 121          string BaseUri = uri.substr(0,uri.find(Marker));
 122          if (URItoFileName(BaseUri) == Dir->d_name)
 123             break;
 124       }
 125       // nothing found, nuke it
 126       if (I == list.end())
 127          unlink(Dir->d_name);
 128    };
 129
 130    chdir(StartDir.c_str());
 131    closedir(D);
 132    return true;
 133 }
 134
 135
 136 bool MirrorMethod::GetMirrorFile(string uri)
 137 {
 138    string Marker = _config->Find("Acquire::Mirror::MagicMarker","///");
 139    BaseUri = uri.substr(0,uri.find(Marker));
 140
 141    string fetch = BaseUri;
 142    fetch.replace(0,strlen("mirror://"),"http://");
 143
 144    // get new file
 145    MirrorFile = _config->FindDir("Dir::State::mirrors") + URItoFileName(BaseUri);
 146
 147    if(Debug)
 148    {
 149       cerr << "base-uri: " << BaseUri << endl;
 150       cerr << "mirror-file: " << MirrorFile << endl;
 151    }
 152
 153    // check the file, if it is not older than RefreshInterval just use it
 154    // otherwise try to get a new one
 155    if(FileExists(MirrorFile))
 156    {
 157       struct stat buf;
 158       time_t t,now,refresh;
 159       if(stat(MirrorFile.c_str(), &buf) != 0)
 160          return false;
 161       t = std::max(buf.st_mtime, buf.st_ctime);
 162       now = time(NULL);
 163       refresh = 60*_config->FindI("Acquire::Mirror::RefreshInterval",360);
 164       if(t + refresh > now)
 165       {
 166          if(Debug)
 167             clog << "Mirror file is in RefreshInterval" << endl;
 168          HasMirrorFile = true;
 169          return true;
 170       }
 171       if(Debug)
 172          clog << "Mirror file " << MirrorFile << " older than " << refresh << "min, re-download it" << endl;
 173    }
 174
 175    // not that great to use pkgAcquire here, but we do not have
 176    // any other way right now
 177    pkgAcquire Fetcher;
 178    new pkgAcqFile(&Fetcher, fetch, "", 0, "", "", "", MirrorFile);
 179    bool res = (Fetcher.Run() == pkgAcquire::Continue);
 180    if(res)
 181       HasMirrorFile = true;
 182    Fetcher.Shutdown();
 183    return res;
 184 }
 185
 186 bool MirrorMethod::SelectMirror()
 187 {
 188    // FIXME: make the mirror selection more clever, do not
 189    //        just use the first one!
 190    ifstream in(MirrorFile.c_str());
 191    getline(in, Mirror);
 192    if(Debug)
 193       cerr << "Using mirror: " << Mirror << endl;
 194
 195    UsedMirror = Mirror;
 196    return true;
 197 }
 198
 199 // MirrorMethod::Fetch - Fetch an item                                  /*{{{*/
 200 // ---------------------------------------------------------------------
 201 /* This adds an item to the pipeline. We keep the pipeline at a fixed
 202    depth. */
 203 bool MirrorMethod::Fetch(FetchItem *Itm)
 204 {
 205    // select mirror only once per session
 206    if(!HasMirrorFile)
 207    {
 208       Clean(_config->FindDir("Dir::State::mirrors"));
 209       GetMirrorFile(Itm->Uri);
 210       SelectMirror();
 211    }
 212
 213    for (FetchItem *I = Queue; I != 0; I = I->Next)
 214    {
 215       if(I->Uri.find("mirror://") != string::npos)
 216          I->Uri.replace(0,BaseUri.size(),Mirror);
 217    }
 218
 219    // now run the real fetcher
 220    return HttpMethod::Fetch(Itm);
 221 };
 222
 223 void MirrorMethod::Fail(string Err,bool Transient)
 224 {
 225    if(Queue->Uri.find("http://") != string::npos)
 226       Queue->Uri.replace(0,Mirror.size(), BaseUri);
 227    pkgAcqMethod::Fail(Err, Transient);
 228 }
 229
 230 void MirrorMethod::URIStart(FetchResult &Res)
 231 {
 232    if(Queue->Uri.find("http://") != string::npos)
 233       Queue->Uri.replace(0,Mirror.size(), BaseUri);
 234    pkgAcqMethod::URIStart(Res);
 235 }
 236
 237 void MirrorMethod::URIDone(FetchResult &Res,FetchResult *Alt)
 238 {
 239    if(Queue->Uri.find("http://") != string::npos)
 240       Queue->Uri.replace(0,Mirror.size(), BaseUri);
 241    pkgAcqMethod::URIDone(Res, Alt);
 242 }
 243
 244
 245 int main()
 246 {
 247    setlocale(LC_ALL, "");
 248
 249    MirrorMethod Mth;
 250
 251    return Mth.Loop();
 252 }
 253
 254