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 "qemu/error-report.h"
  22 #include "channel.h"
  23 #include "exec.h"
  24 #include "migration.h"
  25 #include "io/channel-command.h"
  26 #include "trace.h"
  27 #include "qemu/cutils.h"
  28
  29 #ifdef WIN32
  30 const char *exec_get_cmd_path(void);
  31 const char *exec_get_cmd_path(void)
  32 {
  33     g_autofree char *detected_path = g_new(char, MAX_PATH);
  34     if (GetSystemDirectoryA(detected_path, MAX_PATH) == 0) {
  35         warn_report("Could not detect cmd.exe path, using default.");
  36         return "C:\\Windows\\System32\\cmd.exe";
  37     }
  38     pstrcat(detected_path, MAX_PATH, "\\cmd.exe");
  39     return g_steal_pointer(&detected_path);
  40 }
  41 #endif
  42
  43 void exec_start_outgoing_migration(MigrationState *s, const char *command, Error **errp)
  44 {
  45     QIOChannel *ioc;
  46
  47 #ifdef WIN32
  48     const char *argv[] = { exec_get_cmd_path(), "/c", command, NULL };
  49 #else
  50     const char *argv[] = { "/bin/sh", "-c", command, NULL };
  51 #endif
  52
  53     trace_migration_exec_outgoing(command);
  54     ioc = QIO_CHANNEL(qio_channel_command_new_spawn(argv,
  55                                                     O_RDWR,
  56                                                     errp));
  57     if (!ioc) {
  58         return;
  59     }
  60
  61     qio_channel_set_name(ioc, "migration-exec-outgoing");
  62     migration_channel_connect(s, ioc, NULL, NULL);
  63     object_unref(OBJECT(ioc));
  64 }
  65
  66 static gboolean exec_accept_incoming_migration(QIOChannel *ioc,
  67                                                GIOCondition condition,
  68                                                gpointer opaque)
  69 {
  70     migration_channel_process_incoming(ioc);
  71     object_unref(OBJECT(ioc));
  72     return G_SOURCE_REMOVE;
  73 }
  74
  75 void exec_start_incoming_migration(const char *command, Error **errp)
  76 {
  77     QIOChannel *ioc;
  78
  79 #ifdef WIN32
  80     const char *argv[] = { exec_get_cmd_path(), "/c", command, NULL };
  81 #else
  82     const char *argv[] = { "/bin/sh", "-c", command, NULL };
  83 #endif
  84
  85     trace_migration_exec_incoming(command);
  86     ioc = QIO_CHANNEL(qio_channel_command_new_spawn(argv,
  87                                                     O_RDWR,
  88                                                     errp));
  89     if (!ioc) {
  90         return;
  91     }
  92
  93     qio_channel_set_name(ioc, "migration-exec-incoming");
  94     qio_channel_add_watch_full(ioc, G_IO_IN,
  95                                exec_accept_incoming_migration,
  96                                NULL, NULL,
  97                                g_main_context_get_thread_default());
  98 }