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  * - uses 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  *   and better error handling there!
  46  * - support more than http
  47  * - testing :)
  48  */
  49
  50 MirrorMethod::MirrorMethod()
  51    : HttpMethod(), HasMirrorFile(false)
  52 {
  53 };
  54
  55 // HttpMethod::Configuration - Handle a configuration message           /*{{{*/
  56 // ---------------------------------------------------------------------
  57 /* We stash the desired pipeline depth */
  58 bool MirrorMethod::Configuration(string Message)
  59 {
  60    if (pkgAcqMethod::Configuration(Message) == false)
  61       return false;
  62    Debug = _config->FindB("Debug::Acquire::mirror",false);
  63
  64    return true;
  65 }
  66                                                                         /*}}}*/
  67
  68 // clean the mirrors dir based on ttl information
  69 bool MirrorMethod::Clean(string Dir)
  70 {
  71    vector<metaIndex *>::const_iterator I;
  72
  73    if(Debug)
  74       clog << "MirrorMethod::Clean(): " << Dir << endl;
  75
  76    // read sources.list
  77    pkgSourceList list;
  78    list.ReadMainList();
  79
  80    DIR *D = opendir(Dir.c_str());
  81    if (D == 0)
  82       return _error->Errno("opendir",_("Unable to read %s"),Dir.c_str());
  83
  84    string StartDir = SafeGetCWD();
  85    if (chdir(Dir.c_str()) != 0)
  86    {
  87       closedir(D);
  88       return _error->Errno("chdir",_("Unable to change to %s"),Dir.c_str());
  89    }
  90
  91    for (struct dirent *Dir = readdir(D); Dir != 0; Dir = readdir(D))
  92    {
  93       // Skip some files..
  94       if (strcmp(Dir->d_name,"lock") == 0 ||
  95           strcmp(Dir->d_name,"partial") == 0 ||
  96           strcmp(Dir->d_name,".") == 0 ||
  97           strcmp(Dir->d_name,"..") == 0)
  98          continue;
  99
 100       // see if we have that uri
 101       for(I=list.begin(); I != list.end(); I++)
 102       {
 103          string uri = (*I)->GetURI();
 104          if(uri.substr(0,strlen("mirror://")) != string("mirror://"))
 105             continue;
 106          string BaseUri = uri.substr(0,uri.size()-1);
 107          if (URItoFileName(BaseUri) == Dir->d_name)
 108             break;
 109       }
 110       // nothing found, nuke it
 111       if (I == list.end())
 112          unlink(Dir->d_name);
 113    };
 114
 115    chdir(StartDir.c_str());
 116    closedir(D);
 117    return true;
 118 }
 119
 120
 121 bool MirrorMethod::GetMirrorFile(string mirror_uri_str)
 122 {
 123    /*
 124     - a mirror_uri_str looks like this:
 125     mirror://people.ubuntu.com/~mvo/apt/mirror/mirrors/dists/feisty/Release.gpg
 126
 127     - the matching source.list entry
 128     deb mirror://people.ubuntu.com/~mvo/apt/mirror/mirrors feisty main
 129
 130     - we actually want to go after:
 131     http://people.ubuntu.com/~mvo/apt/mirror/mirrors
 132
 133     And we need to save the BaseUri for later:
 134     - mirror://people.ubuntu.com/~mvo/apt/mirror/mirrors
 135
 136    FIXME: what if we have two similar prefixes?
 137      mirror://people.ubuntu.com/~mvo/mirror
 138      mirror://people.ubuntu.com/~mvo/mirror2
 139    then mirror_uri_str looks like:
 140      mirror://people.ubuntu.com/~mvo/apt/mirror/dists/feisty/Release.gpg
 141      mirror://people.ubuntu.com/~mvo/apt/mirror2/dists/feisty/Release.gpg
 142    we search sources.list and find:
 143      mirror://people.ubuntu.com/~mvo/apt/mirror
 144    in both cases! So we need to apply some domain knowledge here :( and
 145    check for /dists/ or /Release.gpg as suffixes
 146    */
 147    if(Debug)
 148       std::cerr << "GetMirrorFile: " << mirror_uri_str << std::endl;
 149
 150    // read sources.list and find match
 151    vector<metaIndex *>::const_iterator I;
 152    pkgSourceList list;
 153    list.ReadMainList();
 154    for(I=list.begin(); I != list.end(); I++)
 155    {
 156       string uristr = (*I)->GetURI();
 157       if(Debug)
 158          std::cerr << "Checking: " << uristr << std::endl;
 159       if(uristr.substr(0,strlen("mirror://")) != string("mirror://"))
 160          continue;
 161       // find matching uri in sources.list
 162       if(mirror_uri_str.substr(0,uristr.size()) == uristr)
 163       {
 164          if(Debug)
 165             std::cerr << "found BaseURI: " << uristr << std::endl;
 166          BaseUri = uristr.substr(0,uristr.size()-1);
 167       }
 168    }
 169    string fetch = BaseUri;
 170    fetch.replace(0,strlen("mirror://"),"http://");
 171
 172    // get new file
 173    MirrorFile = _config->FindDir("Dir::State::mirrors") + URItoFileName(BaseUri);
 174
 175    if(Debug)
 176    {
 177       cerr << "base-uri: " << BaseUri << endl;
 178       cerr << "mirror-file: " << MirrorFile << endl;
 179    }
 180
 181    // check the file, if it is not older than RefreshInterval just use it
 182    // otherwise try to get a new one
 183    if(FileExists(MirrorFile))
 184    {
 185       struct stat buf;
 186       time_t t,now,refresh;
 187       if(stat(MirrorFile.c_str(), &buf) != 0)
 188          return false;
 189       t = std::max(buf.st_mtime, buf.st_ctime);
 190       now = time(NULL);
 191       refresh = 60*_config->FindI("Acquire::Mirror::RefreshInterval",360);
 192       if(t + refresh > now)
 193       {
 194          if(Debug)
 195             clog << "Mirror file is in RefreshInterval" << endl;
 196          HasMirrorFile = true;
 197          return true;
 198       }
 199       if(Debug)
 200          clog << "Mirror file " << MirrorFile << " older than " << refresh << "min, re-download it" << endl;
 201    }
 202
 203    // not that great to use pkgAcquire here, but we do not have
 204    // any other way right now
 205    pkgAcquire Fetcher;
 206    new pkgAcqFile(&Fetcher, fetch, "", 0, "", "", "", MirrorFile);
 207    bool res = (Fetcher.Run() == pkgAcquire::Continue);
 208    if(res)
 209       HasMirrorFile = true;
 210    Fetcher.Shutdown();
 211    return res;
 212 }
 213
 214 bool MirrorMethod::SelectMirror()
 215 {
 216    // FIXME: make the mirror selection more clever, do not
 217    //        just use the first one!
 218    ifstream in(MirrorFile.c_str());
 219    getline(in, Mirror);
 220    if(Debug)
 221       cerr << "Using mirror: " << Mirror << endl;
 222
 223    UsedMirror = Mirror;
 224    return true;
 225 }
 226
 227 // MirrorMethod::Fetch - Fetch an item                                  /*{{{*/
 228 // ---------------------------------------------------------------------
 229 /* This adds an item to the pipeline. We keep the pipeline at a fixed
 230    depth. */
 231 bool MirrorMethod::Fetch(FetchItem *Itm)
 232 {
 233    // select mirror only once per session
 234    if(!HasMirrorFile)
 235    {
 236       Clean(_config->FindDir("Dir::State::mirrors"));
 237       GetMirrorFile(Itm->Uri);
 238       SelectMirror();
 239    }
 240
 241    for (FetchItem *I = Queue; I != 0; I = I->Next)
 242    {
 243       if(I->Uri.find("mirror://") != string::npos)
 244          I->Uri.replace(0,BaseUri.size(),Mirror);
 245    }
 246
 247    // now run the real fetcher
 248    return HttpMethod::Fetch(Itm);
 249 };
 250
 251 void MirrorMethod::Fail(string Err,bool Transient)
 252 {
 253    if(Queue->Uri.find("http://") != string::npos)
 254       Queue->Uri.replace(0,Mirror.size(), BaseUri);
 255    pkgAcqMethod::Fail(Err, Transient);
 256 }
 257
 258 void MirrorMethod::URIStart(FetchResult &Res)
 259 {
 260    if(Queue->Uri.find("http://") != string::npos)
 261       Queue->Uri.replace(0,Mirror.size(), BaseUri);
 262    pkgAcqMethod::URIStart(Res);
 263 }
 264
 265 void MirrorMethod::URIDone(FetchResult &Res,FetchResult *Alt)
 266 {
 267    if(Queue->Uri.find("http://") != string::npos)
 268       Queue->Uri.replace(0,Mirror.size(), BaseUri);
 269    pkgAcqMethod::URIDone(Res, Alt);
 270 }
 271
 272
 273 int main()
 274 {
 275    setlocale(LC_ALL, "");
 276
 277    MirrorMethod Mth;
 278
 279    return Mth.Loop();
 280 }
 281
 282