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  * - support more than http
  46  * - testing :)
  47  */
  48
  49 MirrorMethod::MirrorMethod()
  50    : HttpMethod(), HasMirrorFile(false)
  51 {
  52 };
  53
  54 // HttpMethod::Configuration - Handle a configuration message           /*{{{*/
  55 // ---------------------------------------------------------------------
  56 /* We stash the desired pipeline depth */
  57 bool MirrorMethod::Configuration(string Message)
  58 {
  59    if (pkgAcqMethod::Configuration(Message) == false)
  60       return false;
  61    Debug = _config->FindB("Debug::Acquire::mirror",false);
  62
  63    return true;
  64 }
  65                                                                         /*}}}*/
  66
  67 // clean the mirrors dir based on ttl information
  68 bool MirrorMethod::Clean(string Dir)
  69 {
  70    vector<metaIndex *>::const_iterator I;
  71
  72    if(Debug)
  73       clog << "MirrorMethod::Clean(): " << Dir << endl;
  74
  75    // read sources.list
  76    pkgSourceList list;
  77    list.ReadMainList();
  78
  79    DIR *D = opendir(Dir.c_str());
  80    if (D == 0)
  81       return _error->Errno("opendir",_("Unable to read %s"),Dir.c_str());
  82
  83    string StartDir = SafeGetCWD();
  84    if (chdir(Dir.c_str()) != 0)
  85    {
  86       closedir(D);
  87       return _error->Errno("chdir",_("Unable to change to %s"),Dir.c_str());
  88    }
  89
  90    for (struct dirent *Dir = readdir(D); Dir != 0; Dir = readdir(D))
  91    {
  92       // Skip some files..
  93       if (strcmp(Dir->d_name,"lock") == 0 ||
  94           strcmp(Dir->d_name,"partial") == 0 ||
  95           strcmp(Dir->d_name,".") == 0 ||
  96           strcmp(Dir->d_name,"..") == 0)
  97          continue;
  98
  99       // see if we have that uri
 100       for(I=list.begin(); I != list.end(); I++)
 101       {
 102          string uri = (*I)->GetURI();
 103          if(uri.substr(0,strlen("mirror://")) != string("mirror://"))
 104             continue;
 105          string BaseUri = uri.substr(0,uri.size()-1);
 106          if (URItoFileName(BaseUri) == Dir->d_name)
 107             break;
 108       }
 109       // nothing found, nuke it
 110       if (I == list.end())
 111          unlink(Dir->d_name);
 112    };
 113
 114    chdir(StartDir.c_str());
 115    closedir(D);
 116    return true;
 117 }
 118
 119
 120 bool MirrorMethod::GetMirrorFile(string mirror_uri_str)
 121 {
 122    /*
 123     - a mirror_uri_str looks like this:
 124     mirror://people.ubuntu.com/~mvo/apt/mirror/mirrors/dists/feisty/Release.gpg
 125
 126     - the matching source.list entry
 127     deb mirror://people.ubuntu.com/~mvo/apt/mirror/mirrors feisty main
 128
 129     - we actually want to go after:
 130     http://people.ubuntu.com/~mvo/apt/mirror/mirrors
 131
 132     And we need to save the BaseUri for later:
 133     - mirror://people.ubuntu.com/~mvo/apt/mirror/mirrors
 134
 135    FIXME: what if we have two similar prefixes?
 136      mirror://people.ubuntu.com/~mvo/mirror
 137      mirror://people.ubuntu.com/~mvo/mirror2
 138    then mirror_uri_str looks like:
 139      mirror://people.ubuntu.com/~mvo/apt/mirror/dists/feisty/Release.gpg
 140      mirror://people.ubuntu.com/~mvo/apt/mirror2/dists/feisty/Release.gpg
 141    we search sources.list and find:
 142      mirror://people.ubuntu.com/~mvo/apt/mirror
 143    in both cases! So we need to apply some domain knowledge here :( and
 144    check for /dists/ or /Release.gpg as suffixes
 145    */
 146    if(Debug)
 147       std::cerr << "GetMirrorFile: " << mirror_uri_str << std::endl;
 148
 149    // read sources.list and find match
 150    vector<metaIndex *>::const_iterator I;
 151    pkgSourceList list;
 152    list.ReadMainList();
 153    for(I=list.begin(); I != list.end(); I++)
 154    {
 155       string uristr = (*I)->GetURI();
 156       if(Debug)
 157          std::cerr << "Checking: " << uristr << std::endl;
 158       if(uristr.substr(0,strlen("mirror://")) != string("mirror://"))
 159          continue;
 160       // find matching uri in sources.list
 161       if(mirror_uri_str.substr(0,uristr.size()) == uristr)
 162       {
 163          if(Debug)
 164             std::cerr << "found BaseURI: " << uristr << std::endl;
 165          BaseUri = uristr.substr(0,uristr.size()-1);
 166       }
 167    }
 168    string fetch = BaseUri;
 169    fetch.replace(0,strlen("mirror://"),"http://");
 170
 171    // get new file
 172    MirrorFile = _config->FindDir("Dir::State::mirrors") + URItoFileName(BaseUri);
 173
 174    if(Debug)
 175    {
 176       cerr << "base-uri: " << BaseUri << endl;
 177       cerr << "mirror-file: " << MirrorFile << endl;
 178    }
 179
 180    // check the file, if it is not older than RefreshInterval just use it
 181    // otherwise try to get a new one
 182    if(FileExists(MirrorFile))
 183    {
 184       struct stat buf;
 185       time_t t,now,refresh;
 186       if(stat(MirrorFile.c_str(), &buf) != 0)
 187          return false;
 188       t = std::max(buf.st_mtime, buf.st_ctime);
 189       now = time(NULL);
 190       refresh = 60*_config->FindI("Acquire::Mirror::RefreshInterval",360);
 191       if(t + refresh > now)
 192       {
 193          if(Debug)
 194             clog << "Mirror file is in RefreshInterval" << endl;
 195          HasMirrorFile = true;
 196          return true;
 197       }
 198       if(Debug)
 199          clog << "Mirror file " << MirrorFile << " older than " << refresh << "min, re-download it" << endl;
 200    }
 201
 202    // not that great to use pkgAcquire here, but we do not have
 203    // any other way right now
 204    pkgAcquire Fetcher;
 205    new pkgAcqFile(&Fetcher, fetch, "", 0, "", "", "", MirrorFile);
 206    bool res = (Fetcher.Run() == pkgAcquire::Continue);
 207    if(res)
 208       HasMirrorFile = true;
 209    Fetcher.Shutdown();
 210    return res;
 211 }
 212
 213 bool MirrorMethod::SelectMirror()
 214 {
 215    // FIXME: make the mirror selection more clever, do not
 216    //        just use the first one!
 217    ifstream in(MirrorFile.c_str());
 218    getline(in, Mirror);
 219    if(Debug)
 220       cerr << "Using mirror: " << Mirror << endl;
 221
 222    UsedMirror = Mirror;
 223    return true;
 224 }
 225
 226 // MirrorMethod::Fetch - Fetch an item                                  /*{{{*/
 227 // ---------------------------------------------------------------------
 228 /* This adds an item to the pipeline. We keep the pipeline at a fixed
 229    depth. */
 230 bool MirrorMethod::Fetch(FetchItem *Itm)
 231 {
 232    // select mirror only once per session
 233    if(!HasMirrorFile)
 234    {
 235       Clean(_config->FindDir("Dir::State::mirrors"));
 236       GetMirrorFile(Itm->Uri);
 237       SelectMirror();
 238    }
 239
 240    for (FetchItem *I = Queue; I != 0; I = I->Next)
 241    {
 242       if(I->Uri.find("mirror://") != string::npos)
 243          I->Uri.replace(0,BaseUri.size(),Mirror);
 244    }
 245
 246    // now run the real fetcher
 247    return HttpMethod::Fetch(Itm);
 248 };
 249
 250 void MirrorMethod::Fail(string Err,bool Transient)
 251 {
 252    if(Queue->Uri.find("http://") != string::npos)
 253       Queue->Uri.replace(0,Mirror.size(), BaseUri);
 254    pkgAcqMethod::Fail(Err, Transient);
 255 }
 256
 257 void MirrorMethod::URIStart(FetchResult &Res)
 258 {
 259    if(Queue->Uri.find("http://") != string::npos)
 260       Queue->Uri.replace(0,Mirror.size(), BaseUri);
 261    pkgAcqMethod::URIStart(Res);
 262 }
 263
 264 void MirrorMethod::URIDone(FetchResult &Res,FetchResult *Alt)
 265 {
 266    if(Queue->Uri.find("http://") != string::npos)
 267       Queue->Uri.replace(0,Mirror.size(), BaseUri);
 268    pkgAcqMethod::URIDone(Res, Alt);
 269 }
 270
 271
 272 int main()
 273 {
 274    setlocale(LC_ALL, "");
 275
 276    MirrorMethod Mth;
 277
 278    return Mth.Loop();
 279 }
 280
 281