Adding upstream version 2.7.12.upstream/2.7.12

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 324 insertions, 0 deletions

diff --git a/apt-pkg/acquire-worker.h b/apt-pkg/acquire-worker.h
new file mode 100644
index 0000000..f59d659
--- /dev/null
+++ b/apt-pkg/acquire-worker.h
@@ -0,0 +1,324 @@
+// -*- mode: cpp; mode: fold -*-
+// Description								/*{{{*/
+/* ######################################################################
+
+   Acquire Worker - Worker process manager
+
+   Each worker class is associated with exactly one subprocess.
+
+   ##################################################################### */
+									/*}}}*/
+
+/** \addtogroup acquire
+ *  @{
+ *
+ *  \file acquire-worker.h
+ */
+
+#ifndef PKGLIB_ACQUIRE_WORKER_H
+#define PKGLIB_ACQUIRE_WORKER_H
+
+#include <apt-pkg/acquire.h>
+#include <apt-pkg/weakptr.h>
+
+#include <string>
+#include <vector>
+#include <sys/types.h>
+
+/** \brief A fetch subprocess.
+ *
+ *  A worker process is responsible for one stage of the fetch.  This
+ *  class encapsulates the communications protocol between the master
+ *  process and the worker, from the master end.
+ *
+ *  Each worker is intrinsically placed on two linked lists.  The
+ *  Queue list (maintained in the #NextQueue variable) is maintained
+ *  by the pkgAcquire::Queue class; it represents the set of workers
+ *  assigned to a particular queue.  The Acquire list (maintained in
+ *  the #NextAcquire variable) is maintained by the pkgAcquire class;
+ *  it represents the set of active workers for a particular
+ *  pkgAcquire object.
+ *
+ *  \todo Like everything else in the Acquire system, this has way too
+ *  many protected items.
+ *
+ *  \sa pkgAcqMethod, pkgAcquire::Item, pkgAcquire
+ */
+class APT_PUBLIC pkgAcquire::Worker : public WeakPointable
+{
+   /** \brief dpointer placeholder (for later in case we need it) */
+   void * const d;
+  
+   friend class pkgAcquire;
+   
+   protected:
+   friend class Queue;
+
+   /** \brief The next link on the Queue list.
+    *
+    *  \todo This is always NULL; is it just for future use?
+    */
+   Worker *NextQueue;
+
+   /** \brief The next link on the Acquire list. */
+   Worker *NextAcquire;
+   
+   /** \brief The Queue with which this worker is associated. */
+   Queue *OwnerQ;
+
+   /** \brief The download progress indicator to which progress
+    *  messages should be sent.
+    */
+   pkgAcquireStatus *Log;
+
+   /** \brief The configuration of this method.  On startup, the
+    *  target of this pointer is filled in with basic data about the
+    *  method, as reported by the worker.
+    */
+   MethodConfig *Config;
+
+   /** \brief The access method to be used by this worker.
+    *
+    *  \todo Doesn't this duplicate Config->Access?
+    */
+   std::string Access;
+
+   /** \brief The PID of the subprocess. */
+   pid_t Process;
+
+   /** \brief A file descriptor connected to the standard output of
+    *  the subprocess.
+    *
+    *  Used to read messages and data from the subprocess.
+    */
+   int InFd;
+
+   /** \brief A file descriptor connected to the standard input of the
+    *  subprocess.
+    *
+    *  Used to send commands and configuration data to the subprocess.
+    */
+   int OutFd;
+
+   /** \brief The socket to send SCM_RIGHTS message through
+    */
+   int PrivSepSocketFd;
+   int PrivSepSocketFdChild;
+
+   /** \brief Set to \b true if the worker is in a state in which it
+    *  might generate data or command responses.
+    *
+    *  \todo Is this right?  It's a guess.
+    */
+   bool InReady;
+
+   /** \brief Set to \b true if the worker is in a state in which it
+    *  is legal to send commands to it.
+    *
+    *  \todo Is this right?
+    */
+   bool OutReady;
+   
+   /** If \b true, debugging output will be sent to std::clog. */
+   bool Debug;
+
+   /** \brief The raw text values of messages received from the
+    *  worker, in sequence.
+    */
+   std::vector<std::string> MessageQueue;
+
+   /** \brief Buffers pending writes to the subprocess.
+    *
+    *  \todo Wouldn't a std::dequeue be more appropriate?
+    */
+   std::string OutQueue;
+   
+   /** \brief Common code for the constructor.
+    *
+    *  Initializes NextQueue and NextAcquire to NULL; Process, InFd,
+    *  and OutFd to -1, OutReady and InReady to \b false, and Debug
+    *  from _config.
+    */
+   void Construct();
+   
+   /** \brief Retrieve any available messages from the subprocess.
+    *
+    *  The messages are retrieved as in \link strutl.h ReadMessages()\endlink, and
+    *  #MethodFailure() is invoked if an error occurs; in particular,
+    *  if the pipe to the subprocess dies unexpectedly while a message
+    *  is being read.
+    *
+    *  \return \b true if the messages were successfully read, \b
+    *  false otherwise.
+    */
+   bool ReadMessages();
+
+   /** \brief Parse and dispatch pending messages.
+    *
+    *  This dispatches the message in a manner appropriate for its
+    *  type.
+    *
+    *  \todo Several message types lack separate handlers.
+    *
+    *  \sa Capabilities(), SendConfiguration(), MediaChange()
+    */
+   bool RunMessages();
+
+   /** \brief Read and dispatch any pending messages from the
+    *  subprocess.
+    *
+    *  \return \b false if the subprocess died unexpectedly while a
+    *  message was being transmitted.
+    */
+   bool InFdReady();
+
+   /** \brief Send any pending commands to the subprocess.
+    *
+    *  This method will fail if there is no pending output.
+    *
+    *  \return \b true if all commands were succeeded, \b false if an
+    *  error occurred (in which case MethodFailure() will be invoked).
+    */
+   bool OutFdReady();
+   
+   /** \brief Handle a 100 Capabilities response from the subprocess.
+    *
+    *  \param Message the raw text of the message from the subprocess.
+    *
+    *  The message will be parsed and its contents used to fill
+    *  #Config.  If #Config is NULL, this routine is a NOP.
+    *
+    *  \return \b true.
+    */
+   bool Capabilities(std::string Message);
+
+   /** \brief Send a 601 Configuration message (containing the APT
+    *  configuration) to the subprocess.
+    *
+    *  The APT configuration will be send to the subprocess in a
+    *  message of the following form:
+    *
+    *  <pre>
+    *  601 Configuration
+    *  Config-Item: Fully-Qualified-Item=Val
+    *  Config-Item: Fully-Qualified-Item=Val
+    *  ...
+    *  </pre>
+    *
+    *  \return \b true if the command was successfully sent, \b false
+    *  otherwise.
+    */
+   bool SendConfiguration();
+
+   /** \brief Handle a 403 Media Change message.
+    *
+    *  \param Message the raw text of the message; the Media field
+    *  indicates what type of media should be changed, and the Drive
+    *  field indicates where the media is located.
+    *
+    *  Invokes pkgAcquireStatus::MediaChange(Media, Drive) to ask the
+    *  user to swap disks; informs the subprocess of the result (via
+    *  603 Media Changed, with the Failed field set to \b true if the
+    *  user cancelled the media change).
+    */
+   bool MediaChange(std::string Message);
+   
+   /** \brief Invoked when the worked process dies unexpectedly.
+    *
+    *  Waits for the subprocess to terminate and generates an error if
+    *  it terminated abnormally, then closes and blanks out all file
+    *  descriptors.  Discards all pending messages from the
+    *  subprocess.
+    *
+    *  \return \b false.
+    */
+   bool MethodFailure();
+
+   /** \brief Invoked when a fetch job is completed, either
+    *  successfully or unsuccessfully.
+    *
+    *  Resets the status information for the worker process.
+    */
+   void ItemDone();
+   
+   public:
+   
+   /** \brief The queue entry that is currently being downloaded. */
+   pkgAcquire::Queue::QItem *CurrentItem;
+
+   /** \brief The most recent status string received from the
+    *  subprocess.
+    */
+   std::string Status;
+
+   /** \brief Tell the subprocess to download the given item.
+    *
+    *  \param Item the item to queue up.
+    *  \return \b true if the item was successfully enqueued.
+    *
+    *  Queues up a 600 URI Acquire message for the given item to be
+    *  sent at the next possible moment.  Does \e not flush the output
+    *  queue.
+    */
+   bool QueueItem(pkgAcquire::Queue::QItem *Item);
+   APT_HIDDEN bool ReplyAux(pkgAcquire::ItemDesc const &Item);
+
+   /** \brief Start up the worker and fill in #Config.
+    *
+    *  Reads the first message from the worker, which is assumed to be
+    *  a 100 Capabilities message.
+    *
+    *  \return \b true if all operations completed successfully.
+    */
+   bool Start();
+
+   /** \brief Update the worker statistics (CurrentSize, TotalSize,
+    *  etc).
+    */
+   void Pulse();
+
+   /** \return The fetch method configuration. */
+   inline const MethodConfig *GetConf() const {return Config;};
+
+   /** \brief Create a new Worker to download files.
+    *
+    *  \param OwnerQ The queue into which this worker should be
+    *  placed.
+    *
+    *  \param Config A location in which to store information about
+    *  the fetch method.
+    *
+    *  \param Log The download progress indicator that should be used
+    *  to report the progress of this worker.
+    */
+   Worker(Queue *OwnerQ,MethodConfig *Config,pkgAcquireStatus *Log);
+
+   /** \brief Create a new Worker that should just retrieve
+    *  information about the fetch method.
+    *
+    *  Nothing in particular forces you to refrain from actually
+    *  downloading stuff, but the various status callbacks won't be
+    *  invoked.
+    *
+    *  \param Config A location in which to store information about
+    *  the fetch method.
+    */
+   explicit Worker(MethodConfig *Config);
+
+   /** \brief Clean up this worker.
+    *
+    *  Closes the file descriptors; if MethodConfig::NeedsCleanup is
+    *  \b false, also rudely interrupts the worker with a SIGINT.
+    */
+   virtual ~Worker();
+
+private:
+   APT_HIDDEN void PrepareFiles(char const * const caller, pkgAcquire::Queue::QItem const * const Itm);
+   APT_HIDDEN void HandleFailure(std::vector<pkgAcquire::Item *> const &ItmOwners,
+				 pkgAcquire::MethodConfig *const Config, pkgAcquireStatus *const Log,
+				 std::string const &Message, bool const errTransient, bool const errAuthErr);
+};
+
+/** @} */
+
+#endif