migration/exec.c

   1 /*
   2  * QEMU live migration
   3  *
   4  * Copyright IBM, Corp. 2008
   5  * Copyright Dell MessageOne 2008
   6  * Copyright Red Hat, Inc. 2015-2016
   7  *
   8  * Authors:
   9  *  Anthony Liguori   <aliguori@us.ibm.com>
  10  *  Charles Duffy     <charles_duffy@messageone.com>
  11  *  Daniel P. Berrange <berrange@redhat.com>
  12  *
  13  * This work is licensed under the terms of the GNU GPL, version 2.  See
  14  * the COPYING file in the top-level directory.
  15  *
  16  * Contributions after 2012-01-13 are licensed under the terms of the
  17  * GNU GPL, version 2 or (at your option) any later version.
  18  */
  19
  20 #include "qemu/osdep.h"
  21 #include "channel.h"
  22 #include "exec.h"
  23 #include "migration.h"
  24 #include "io/channel-command.h"
  25 #include "trace.h"
  26 #include "qemu/cutils.h"
  27
  28 #ifdef WIN32
  29 const char *exec_get_cmd_path(void);
  30 const char *exec_get_cmd_path(void)
  31 {
  32     g_autofree char *detected_path = g_new(char, MAX_PATH);
  33     if (GetSystemDirectoryA(detected_path, MAX_PATH) == 0) {
  34         warn_report("Could not detect cmd.exe path, using default.");
  35         return "C:\\Windows\\System32\\cmd.exe";
  36     }
  37     pstrcat(detected_path, MAX_PATH, "\\cmd.exe");
  38     return g_steal_pointer(&detected_path);
  39 }
  40 #endif
  41
  42 void exec_start_outgoing_migration(MigrationState *s, const char *command, Error **errp)
  43 {
  44     QIOChannel *ioc;
  45
  46 #ifdef WIN32
  47     const char *argv[] = { exec_get_cmd_path(), "/c", command, NULL };
  48 #else
  49     const char *argv[] = { "/bin/sh", "-c", command, NULL };
  50 #endif
  51
  52     trace_migration_exec_outgoing(command);
  53     ioc = QIO_CHANNEL(qio_channel_command_new_spawn(argv,
  54                                                     O_RDWR,
  55                                                     errp));
  56     if (!ioc) {
  57         return;
  58     }
  59
  60     qio_channel_set_name(ioc, "migration-exec-outgoing");
  61     migration_channel_connect(s, ioc, NULL, NULL);
  62     object_unref(OBJECT(ioc));
  63 }
  64
  65 static gboolean exec_accept_incoming_migration(QIOChannel *ioc,
  66                                                GIOCondition condition,
  67                                                gpointer opaque)
  68 {
  69     migration_channel_process_incoming(ioc);
  70     object_unref(OBJECT(ioc));
  71     return G_SOURCE_REMOVE;
  72 }
  73
  74 void exec_start_incoming_migration(const char *command, Error **errp)
  75 {
  76     QIOChannel *ioc;
  77
  78 #ifdef WIN32
  79     const char *argv[] = { exec_get_cmd_path(), "/c", command, NULL };
  80 #else
  81     const char *argv[] = { "/bin/sh", "-c", command, NULL };
  82 #endif
  83
  84     trace_migration_exec_incoming(command);
  85     ioc = QIO_CHANNEL(qio_channel_command_new_spawn(argv,
  86                                                     O_RDWR,
  87                                                     errp));
  88     if (!ioc) {
  89         return;
  90     }
  91
  92     qio_channel_set_name(ioc, "migration-exec-incoming");
  93     qio_channel_add_watch_full(ioc, G_IO_IN,
  94                                exec_accept_incoming_migration,
  95                                NULL, NULL,
  96                                g_main_context_get_thread_default());
  97 }