update size of dynamic MMap as we write in from the outside

[apt.git] / apt-pkg / contrib / cdromutl.cc

diff --git a/apt-pkg/contrib/cdromutl.cc b/apt-pkg/contrib/cdromutl.cc
index 0cf9697acd48aedfcf1584bc6ba228c22f1ed288..68b98040722e3b611a03e16d30a227ea015fad40 100644 (file)
--- a/apt-pkg/contrib/cdromutl.cc
+++ b/apt-pkg/contrib/cdromutl.cc
@@ -64,35 +64,44 @@ bool UnmountCdrom(string Path)
 {
    if (IsMounted(Path) == false)
       return true;
-   
-   int Child = ExecFork();
 
-   // The child
-   if (Child == 0)
+   for (int i=0;i<3;i++)
    {
-      // Make all the fds /dev/null
-      for (int I = 0; I != 3; I++)
-        dup2(open("/dev/null",O_RDWR),I);
+   
+      int Child = ExecFork();
 
-      if (_config->Exists("Acquire::cdrom::"+Path+"::UMount") == true)
+      // The child
+      if (Child == 0)
       {
-        if (system(_config->Find("Acquire::cdrom::"+Path+"::UMount").c_str()) != 0)
+        // Make all the fds /dev/null
+        for (int I = 0; I != 3; I++)
+           dup2(open("/dev/null",O_RDWR),I);
+
+        if (_config->Exists("Acquire::cdrom::"+Path+"::UMount") == true)
+        {
+           if (system(_config->Find("Acquire::cdrom::"+Path+"::UMount").c_str()) != 0)
+              _exit(100);
+           _exit(0);            
+        }
+        else
+        {
+           const char *Args[10];
+           Args[0] = "umount";
+           Args[1] = Path.c_str();
+           Args[2] = 0;
+           execvp(Args[0],(char **)Args);      
            _exit(100);
-        _exit(0);               
+        }      
       }
-      else
-      {
-        const char *Args[10];
-        Args[0] = "umount";
-        Args[1] = Path.c_str();
-        Args[2] = 0;
-        execvp(Args[0],(char **)Args);      
-        _exit(100);
-      }      
+
+      // if it can not be umounted, give it a bit more time
+      // this can happen when auto-mount magic or fs/cdrom prober attack
+      if (ExecWait(Child,"umount",true) == true)
+        return true;
+      sleep(1);
    }
 
-   // Wait for mount
-   return ExecWait(Child,"umount",true);
+   return false;
 }
                                                                        /*}}}*/
 // MountCdrom - Mount a cdrom                                          /*{{{*/
@@ -147,6 +156,19 @@ bool MountCdrom(string Path, string DeviceName)
 bool IdentCdrom(string CD,string &Res,unsigned int Version)
 {
    MD5Summation Hash;
+   bool writable_media = false;
+
+   // if we are on a writable medium (like a usb-stick) that is just
+   // used like a cdrom don't use "." as it will constantly change,
+   // use .disk instead
+   if (access(CD.c_str(), W_OK) == 0 && DirectoryExists(CD+string("/.disk"))) 
+   {
+      writable_media = true;
+      CD = CD.append("/.disk");
+      if (_config->FindB("Debug::aptcdrom",false) == true)
+         std::clog << "Found writable cdrom, using alternative path: " << CD
+                   << std::endl;
+   }
 
    string StartDir = SafeGetCWD();
    if (chdir(CD.c_str()) != 0)
@@ -193,10 +215,15 @@ bool IdentCdrom(string CD,string &Res,unsigned int Version)
       struct statvfs Buf;
       if (statvfs(CD.c_str(),&Buf) != 0)
         return _error->Errno("statfs",_("Failed to stat the cdrom"));
-      
+
       // We use a kilobyte block size to advoid overflow
-      sprintf(S,"%lu %lu",(long)(Buf.f_blocks*(Buf.f_bsize/1024)),
-             (long)(Buf.f_bfree*(Buf.f_bsize/1024)));
+      if (writable_media)
+      {
+         sprintf(S,"%lu",(long)(Buf.f_blocks*(Buf.f_bsize/1024)));
+      } else {
+         sprintf(S,"%lu %lu",(long)(Buf.f_blocks*(Buf.f_bsize/1024)),
+                 (long)(Buf.f_bfree*(Buf.f_bsize/1024)));
+      }
       Hash.Add(S);
       sprintf(S,"-%u",Version);
    }