X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/59271f62e4a291c8d96e1f6073203c395734b6ca..ea6db08d45e012d577f3081fa2070db9e034add9:/methods/mirror.cc

diff --git a/methods/mirror.cc b/methods/mirror.cc
index b64879bec..e8873d97b 100644
--- a/methods/mirror.cc
+++ b/methods/mirror.cc
@@ -25,6 +25,8 @@
 
 using namespace std;
 
+#include<sstream>
+
 #include "mirror.h"
 #include "http.h"
 #include "apti18n.h"
@@ -35,29 +37,21 @@ using namespace std;
  * - always picks the first mirror from the list
  * - call out to problem reporting script
  * - supports "deb mirror://host/path/to/mirror-list/// dist component"
- * - use pkgAcqMethod::FailReason() to have a string representation
+ * - uses pkgAcqMethod::FailReason() to have a string representation
  *   of the failure that is also send to LP
  * 
  * TODO: 
  * - deal with runing as non-root because we can't write to the lists 
      dir then -> use the cached mirror file
  * - better method to download than having a pkgAcquire interface here
- * - magicmarker is evil, maybe just use a similar approach as in
-     clean and read the sources.list and use the GetURI() method to find
-     the prefix?
- * support more than http
+ *   and better error handling there!
+ * - support more than http
  * - testing :)
  */
 
 MirrorMethod::MirrorMethod()
-   : HttpMethod(), HasMirrorFile(false)
+   : HttpMethod(), DownloadedMirrorFile(false)
 {
-#if 0
-   HasMirrorFile=true;
-   BaseUri="mirror://people.ubuntu.com/~mvo/mirror/mirrors";
-   MirrorFile="/var/lib/apt/lists/people.ubuntu.com_%7emvo_apt_mirror_mirrors";
-   Mirror="http://de.archive.ubuntu.com/ubuntu/";
-#endif
 };
 
 // HttpMethod::Configuration - Handle a configuration message		/*{{{*/
@@ -81,6 +75,9 @@ bool MirrorMethod::Clean(string Dir)
    if(Debug)
       clog << "MirrorMethod::Clean(): " << Dir << endl;
 
+   if(Dir == "/")
+      return _error->Error("will not clean: '/'");
+
    // read sources.list
    pkgSourceList list;
    list.ReadMainList();
@@ -109,10 +106,9 @@ bool MirrorMethod::Clean(string Dir)
       for(I=list.begin(); I != list.end(); I++)
       {
 	 string uri = (*I)->GetURI();
-	 if(uri.substr(0,strlen("mirror://")) != string("mirror://"))
+	 if(uri.find("mirror://") != 0)
 	    continue;
-	 string Marker = _config->Find("Acquire::Mirror::MagicMarker","///");
-	 string BaseUri = uri.substr(0,uri.find(Marker));
+	 string BaseUri = uri.substr(0,uri.size()-1);
 	 if (URItoFileName(BaseUri) == Dir->d_name)
 	    break;
       }
@@ -127,111 +123,239 @@ bool MirrorMethod::Clean(string Dir)
 }
 
 
-bool MirrorMethod::GetMirrorFile(string uri)
+bool MirrorMethod::DownloadMirrorFile(string mirror_uri_str)
 {
-   string Marker = _config->Find("Acquire::Mirror::MagicMarker","///");
-   BaseUri = uri.substr(0,uri.find(Marker));
+   if(Debug)
+      clog << "MirrorMethod::DownloadMirrorFile(): " << endl;
 
+   // not that great to use pkgAcquire here, but we do not have 
+   // any other way right now
    string fetch = BaseUri;
    fetch.replace(0,strlen("mirror://"),"http://");
 
-   // get new file
-   MirrorFile = _config->FindDir("Dir::State::mirrors") + URItoFileName(BaseUri);
+   pkgAcquire Fetcher;
+   new pkgAcqFile(&Fetcher, fetch, "", 0, "", "", "", MirrorFile);
+   bool res = (Fetcher.Run() == pkgAcquire::Continue);
+   if(res)
+      DownloadedMirrorFile = true;
+   Fetcher.Shutdown();
+   return res;
+}
 
-   if(Debug) 
-   {
-      cerr << "base-uri: " << BaseUri << endl;
-      cerr << "mirror-file: " << MirrorFile << endl;
-   }
+/* convert a the Queue->Uri back to the mirror base uri and look
+ * at all mirrors we have for this, this is needed as queue->uri
+ * may point to different mirrors (if TryNextMirror() was run)
+ */
+void MirrorMethod::CurrentQueueUriToMirror()
+{
+   // already in mirror:// style so nothing to do
+   if(Queue->Uri.find("mirror://") == 0)
+      return;
 
-   // check the file, if it is not older than RefreshInterval just use it
-   // otherwise try to get a new one
-   if(FileExists(MirrorFile)) 
+   // find current mirror and select next one
+   for (vector<string>::const_iterator mirror = AllMirrors.begin();
+	mirror != AllMirrors.end(); ++mirror)
    {
-      struct stat buf;
-      time_t t,now,refresh;
-      if(stat(MirrorFile.c_str(), &buf) != 0)
-	 return false;
-      t = std::max(buf.st_mtime, buf.st_ctime);
-      now = time(NULL);
-      refresh = 60*_config->FindI("Acquire::Mirror::RefreshInterval",360);
-      if(t + refresh > now)
+      if (Queue->Uri.find(*mirror) == 0)
       {
-	 if(Debug)
-	    clog << "Mirror file is in RefreshInterval" << endl;
-	 HasMirrorFile = true;
-	 return true;
+	 Queue->Uri.replace(0, mirror->length(), BaseUri);
+	 return;
       }
-      if(Debug)
-	 clog << "Mirror file " << MirrorFile << " older than " << refresh << "min, re-download it" << endl;
    }
+   _error->Error("Internal error: Failed to convert %s back to %s",
+		 Queue->Uri.c_str(), BaseUri.c_str());
+}
 
-   // not that great to use pkgAcquire here, but we do not have 
-   // any other way right now
-   pkgAcquire Fetcher;
-   new pkgAcqFile(&Fetcher, fetch, "", 0, "", "", "", MirrorFile);
-   bool res = (Fetcher.Run() == pkgAcquire::Continue);
-   if(res)
-      HasMirrorFile = true;
-   Fetcher.Shutdown();
-   return res;
+bool MirrorMethod::TryNextMirror()
+{
+   // find current mirror and select next one
+   for (vector<string>::const_iterator mirror = AllMirrors.begin();
+	mirror != AllMirrors.end(); ++mirror)
+   {
+      if (Queue->Uri.find(*mirror) != 0)
+	 continue;
+
+      vector<string>::const_iterator nextmirror = mirror + 1;
+      if (nextmirror != AllMirrors.end())
+	 break;
+      Queue->Uri.replace(0, mirror->length(), *nextmirror);
+      if (Debug)
+	 clog << "TryNextMirror: " << Queue->Uri << endl;
+      return true;
+   }
+
+   if (Debug)
+      clog << "TryNextMirror could not find another mirror to try" << endl;
+
+   return false;
 }
 
-bool MirrorMethod::SelectMirror()
+bool MirrorMethod::InitMirrors()
 {
+   // if we do not have a MirrorFile, fallback
+   if(!FileExists(MirrorFile))
+   {
+      // FIXME: fallback to a default mirror here instead 
+      //        and provide a config option to define that default
+      return _error->Error(_("No mirror file '%s' found "), MirrorFile.c_str());
+   }
+
    // FIXME: make the mirror selection more clever, do not 
    //        just use the first one!
+   // BUT: we can not make this random, the mirror has to be
+   //      stable accross session, because otherwise we can
+   //      get into sync issues (got indexfiles from mirror A,
+   //      but packages from mirror B - one might be out of date etc)
    ifstream in(MirrorFile.c_str());
-   getline(in, Mirror);
-   if(Debug)
-      cerr << "Using mirror: " << Mirror << endl;
-
+   string s;
+   while (!in.eof()) 
+   {
+      getline(in, s);
+      if (s.size() > 0)
+	 AllMirrors.push_back(s);
+   }
+   Mirror = AllMirrors[0];
    UsedMirror = Mirror;
    return true;
 }
 
+string MirrorMethod::GetMirrorFileName(string mirror_uri_str)
+{
+   /* 
+    - a mirror_uri_str looks like this:
+    mirror://people.ubuntu.com/~mvo/apt/mirror/mirrors/dists/feisty/Release.gpg
+   
+    - the matching source.list entry
+    deb mirror://people.ubuntu.com/~mvo/apt/mirror/mirrors feisty main
+   
+    - we actually want to go after:
+    http://people.ubuntu.com/~mvo/apt/mirror/mirrors
+
+    And we need to save the BaseUri for later:
+    - mirror://people.ubuntu.com/~mvo/apt/mirror/mirrors
+
+   FIXME: what if we have two similar prefixes?
+     mirror://people.ubuntu.com/~mvo/mirror
+     mirror://people.ubuntu.com/~mvo/mirror2
+   then mirror_uri_str looks like:
+     mirror://people.ubuntu.com/~mvo/apt/mirror/dists/feisty/Release.gpg
+     mirror://people.ubuntu.com/~mvo/apt/mirror2/dists/feisty/Release.gpg
+   we search sources.list and find:
+     mirror://people.ubuntu.com/~mvo/apt/mirror
+   in both cases! So we need to apply some domain knowledge here :( and
+   check for /dists/ or /Release.gpg as suffixes
+   */
+   string name;
+   if(Debug)
+      std::cerr << "GetMirrorFileName: " << mirror_uri_str << std::endl;
+
+   // read sources.list and find match
+   vector<metaIndex *>::const_iterator I;
+   pkgSourceList list;
+   list.ReadMainList();
+   for(I=list.begin(); I != list.end(); I++)
+   {
+      string uristr = (*I)->GetURI();
+      if(Debug)
+	 std::cerr << "Checking: " << uristr << std::endl;
+      if(uristr.substr(0,strlen("mirror://")) != string("mirror://"))
+	 continue;
+      // find matching uri in sources.list
+      if(mirror_uri_str.substr(0,uristr.size()) == uristr)
+      {
+	 if(Debug)
+	    std::cerr << "found BaseURI: " << uristr << std::endl;
+	 BaseUri = uristr.substr(0,uristr.size()-1);
+      }
+   }
+   // get new file
+   name = _config->FindDir("Dir::State::mirrors") + URItoFileName(BaseUri);
+
+   if(Debug) 
+   {
+      cerr << "base-uri: " << BaseUri << endl;
+      cerr << "mirror-file: " << name << endl;
+   }
+   return name;
+}
+
 // MirrorMethod::Fetch - Fetch an item					/*{{{*/
 // ---------------------------------------------------------------------
 /* This adds an item to the pipeline. We keep the pipeline at a fixed
    depth. */
 bool MirrorMethod::Fetch(FetchItem *Itm)
 {
-   // select mirror only once per session
-   if(!HasMirrorFile)
+   if(Debug)
+      clog << "MirrorMethod::Fetch()" << endl;
+
+   // the http method uses Fetch(0) as a way to update the pipeline,
+   // just let it do its work in this case - Fetch() with a valid
+   // Itm will always run before the first Fetch(0)
+   if(Itm == NULL) 
+      return HttpMethod::Fetch(Itm);
+
+   // if we don't have the name of the mirror file on disk yet,
+   // calculate it now (can be derived from the uri)
+   if(MirrorFile.empty())
+      MirrorFile = GetMirrorFileName(Itm->Uri);
+
+  // download mirror file once (if we are after index files)
+   if(Itm->IndexFile && !DownloadedMirrorFile)
    {
       Clean(_config->FindDir("Dir::State::mirrors"));
-      GetMirrorFile(Itm->Uri);
-      SelectMirror();
+      DownloadMirrorFile(Itm->Uri);
    }
 
-   for (FetchItem *I = Queue; I != 0; I = I->Next)
-   {
-      if(I->Uri.find("mirror://") != string::npos)
-	 I->Uri.replace(0,BaseUri.size(),Mirror);
+   if(AllMirrors.empty()) {
+      if(!InitMirrors()) {
+	 // no valid mirror selected, something went wrong downloading
+	 // from the master mirror site most likely and there is
+	 // no old mirror file availalbe
+	 return false;
+      }
    }
 
+   if(Itm->Uri.find("mirror://") != string::npos)
+      Itm->Uri.replace(0,BaseUri.size(), Mirror);
+
+   if(Debug)
+      clog << "Fetch: " << Itm->Uri << endl << endl;
+   
    // now run the real fetcher
    return HttpMethod::Fetch(Itm);
 };
 
 void MirrorMethod::Fail(string Err,bool Transient)
 {
-   if(Queue->Uri.find("http://") != string::npos)
-      Queue->Uri.replace(0,Mirror.size(), BaseUri);
+   // FIXME: TryNextMirror is not ideal for indexfile as we may
+   //        run into auth issues
+
+   if (Debug)
+      clog << "Failure to get " << Queue->Uri << endl;
+
+   // try the next mirror on fail (if its not a expected failure,
+   // e.g. translations are ok to ignore)
+   if (!Queue->FailIgnore && TryNextMirror()) 
+      return;
+
+   // all mirrors failed, so bail out
+   string s;
+   strprintf(s, _("[Mirror: %s]"), Mirror.c_str());
+   SetIP(s);
+
+   CurrentQueueUriToMirror();
    pkgAcqMethod::Fail(Err, Transient);
 }
 
 void MirrorMethod::URIStart(FetchResult &Res)
 {
-   if(Queue->Uri.find("http://") != string::npos)
-      Queue->Uri.replace(0,Mirror.size(), BaseUri);
+   CurrentQueueUriToMirror();
    pkgAcqMethod::URIStart(Res);
 }
 
 void MirrorMethod::URIDone(FetchResult &Res,FetchResult *Alt)
 {
-   if(Queue->Uri.find("http://") != string::npos)
-      Queue->Uri.replace(0,Mirror.size(), BaseUri);
+   CurrentQueueUriToMirror();
    pkgAcqMethod::URIDone(Res, Alt);
 }