3 files changed, 11 insertions, 2 deletions
diff --git a/apt-pkg/contrib/fileutl.cc b/apt-pkg/contrib/fileutl.cc
index 20ccaa1c6..df39ae160 100644
--- a/apt-pkg/contrib/fileutl.cc
+++ b/apt-pkg/contrib/fileutl.cc
@@ -2804,6 +2804,11 @@ bool Rename(std::string From, std::string To)				/*{{{*/
 									/*}}}*/
 bool Popen(const char* Args[], FileFd &Fd, pid_t &Child, FileFd::OpenMode Mode)/*{{{*/
 {
+   return Popen(Args, Fd, Child, Mode, true);
+}
+									/*}}}*/
+bool Popen(const char* Args[], FileFd &Fd, pid_t &Child, FileFd::OpenMode Mode, bool CaptureStderr)/*{{{*/
+{
    int fd;
    if (Mode != FileFd::ReadOnly && Mode != FileFd::WriteOnly)
       return _error->Error("Popen supports ReadOnly (x)or WriteOnly mode only");
@@ -2834,7 +2839,8 @@ bool Popen(const char* Args[], FileFd &Fd, pid_t &Child, FileFd::OpenMode Mode)/
       if(Mode == FileFd::ReadOnly)
       {
          dup2(fd, 1);
-         dup2(fd, 2);
+	 if (CaptureStderr == true)
+	    dup2(fd, 2);
       } else if(Mode == FileFd::WriteOnly)
          dup2(fd, 0);
 
diff --git a/apt-pkg/contrib/fileutl.h b/apt-pkg/contrib/fileutl.h
index 9333b8d5f..7ee302d7b 100644
--- a/apt-pkg/contrib/fileutl.h
+++ b/apt-pkg/contrib/fileutl.h
@@ -245,8 +245,11 @@ std::vector<std::string> Glob(std::string const &pattern, int flags=0);
  * \param Child a reference to the integer that stores the child pid
  *        Note that you must call ExecWait() or similar to cleanup
  * \param Mode is either FileFd::ReadOnly or FileFd::WriteOnly
+ * \param CaptureStderr True if we should capture stderr in addition to stdout.
+ *                      (default: True).
  * \return true on success, false on failure with _error set
  */
+bool Popen(const char* Args[], FileFd &Fd, pid_t &Child, FileFd::OpenMode Mode, bool CaptureStderr);
 bool Popen(const char* Args[], FileFd &Fd, pid_t &Child, FileFd::OpenMode Mode);
 
 
diff --git a/apt-pkg/contrib/proxy.cc b/apt-pkg/contrib/proxy.cc
index 84d802dcb..13a6ab940 100644
--- a/apt-pkg/contrib/proxy.cc
+++ b/apt-pkg/contrib/proxy.cc
@@ -48,7 +48,7 @@ bool AutoDetectProxy(URI &URL)
    Args.push_back(nullptr);
    FileFd PipeFd;
    pid_t Child;
-   if(Popen(&Args[0], PipeFd, Child, FileFd::ReadOnly) == false)
+   if(Popen(&Args[0], PipeFd, Child, FileFd::ReadOnly, false) == false)
       return _error->Error("ProxyAutoDetect command '%s' failed!", AutoDetectProxyCmd.c_str());
    char buf[512];
    if (PipeFd.ReadLine(buf, sizeof(buf)) == nullptr)