1 files changed, 58 insertions, 15 deletions

diff --git a/apt-pkg/install-progress.cc b/apt-pkg/install-progress.cc
index 09b1bef9e..fe065da4f 100644
--- a/apt-pkg/install-progress.cc
+++ b/apt-pkg/install-progress.cc
@@ -9,6 +9,8 @@
 #include <sys/ioctl.h>
 #include <sstream>
 #include <fcntl.h>
+#include <algorithm>
+#include <stdio.h>
 
 namespace APT {
 namespace Progress {
@@ -222,8 +224,46 @@ bool PackageManagerProgressDeb822Fd::StatusChanged(std::string PackageName,
 }
 
 
+PackageManagerFancy::PackageManagerFancy()
+   : child_pty(-1)
+{
+   // setup terminal size
+   old_SIGWINCH = signal(SIGWINCH, PackageManagerFancy::staticSIGWINCH);
+   instances.push_back(this);
+}
+std::vector<PackageManagerFancy*> PackageManagerFancy::instances;
+
+PackageManagerFancy::~PackageManagerFancy()
+{
+   instances.erase(find(instances.begin(), instances.end(), this));
+   signal(SIGWINCH, old_SIGWINCH);
+}
+
+void PackageManagerFancy::staticSIGWINCH(int signum)
+{
+   std::vector<PackageManagerFancy *>::const_iterator I;
+   for(I = instances.begin(); I != instances.end(); I++)
+      (*I)->HandleSIGWINCH(signum);
+}
+
+int PackageManagerFancy::GetNumberTerminalRows()
+{
+   struct winsize win;
+   // FIXME: get from "child_pty" instead?
+   if(ioctl(STDOUT_FILENO, TIOCGWINSZ, (char *)&win) != 0)
+      return -1;
+
+   if(_config->FindB("Debug::InstallProgress::Fancy", false) == true)
+      std::cerr << "GetNumberTerminalRows: " << win.ws_row << std::endl;
+   
+   return win.ws_row;
+}
+
 void PackageManagerFancy::SetupTerminalScrollArea(int nr_rows)
 {
+     if(_config->FindB("Debug::InstallProgress::Fancy", false) == true)
+        std::cerr << "SetupTerminalScrollArea: " << nr_rows << std::endl;
+
      // scroll down a bit to avoid visual glitch when the screen
      // area shrinks by one row
      std::cout << "\n";
@@ -232,39 +272,41 @@ void PackageManagerFancy::SetupTerminalScrollArea(int nr_rows)
      std::cout << "\033[s";
          
      // set scroll region (this will place the cursor in the top left)
-     std::cout << "\033[1;" << nr_rows - 1 << "r";
+     std::cout << "\033[0;" << nr_rows - 1 << "r";
             
      // restore cursor but ensure its inside the scrolling area
      std::cout << "\033[u";
      static const char *move_cursor_up = "\033[1A";
      std::cout << move_cursor_up;
 
-     // setup env for (hopefully!) ncurses
-     string s;
-     strprintf(s, "%i", nr_rows);
-     setenv("LINES", s.c_str(), 1);
-
+     // ensure its flushed
      std::flush(std::cout);
+
+     // setup tty size to ensure xterm/linux console are working properly too
+     // see bug #731738
+     struct winsize win;
+     ioctl(child_pty, TIOCGWINSZ, (char *)&win);
+     win.ws_row = nr_rows - 1;
+     ioctl(child_pty, TIOCSWINSZ, (char *)&win);
 }
 
-PackageManagerFancy::PackageManagerFancy()
-   : nr_terminal_rows(-1)
+void PackageManagerFancy::HandleSIGWINCH(int)
 {
-   struct winsize win;
-   if(ioctl(STDOUT_FILENO, TIOCGWINSZ, (char *)&win) == 0)
-   {
-      nr_terminal_rows = win.ws_row;
-   }
+   int nr_terminal_rows = GetNumberTerminalRows();
+   SetupTerminalScrollArea(nr_terminal_rows);
 }
 
-void PackageManagerFancy::Start()
+void PackageManagerFancy::Start(int a_child_pty)
 {
+   child_pty = a_child_pty;
+   int nr_terminal_rows = GetNumberTerminalRows();
    if (nr_terminal_rows > 0)
       SetupTerminalScrollArea(nr_terminal_rows);
 }
 
 void PackageManagerFancy::Stop()
 {
+   int nr_terminal_rows = GetNumberTerminalRows();
    if (nr_terminal_rows > 0)
    {
       SetupTerminalScrollArea(nr_terminal_rows + 1);
@@ -273,6 +315,7 @@ void PackageManagerFancy::Stop()
       static const char* clear_screen_below_cursor = "\033[J";
       std::cout << clear_screen_below_cursor;
    }
+   child_pty = -1;
 }
 
 bool PackageManagerFancy::StatusChanged(std::string PackageName, 
@@ -284,7 +327,7 @@ bool PackageManagerFancy::StatusChanged(std::string PackageName,
           HumanReadableAction))
       return false;
 
-   int row = nr_terminal_rows;
+   int row = GetNumberTerminalRows();
 
    static string save_cursor = "\033[s";
    static string restore_cursor = "\033[u";