[spice-xpi 10/12] Add helper function to get client paths

[Christophe Fergeau <cfergeau@xxxxxxxxxx>]

The SPICE client paths will be different on Windows and Unix so add
a helper function returning the paths to use to spawn the clients.
---
 SpiceXPI/src/plugin/controller-unix.cpp | 66 ++++++++++++++++++++++++---------
 SpiceXPI/src/plugin/controller.h        |  1 +
 2 files changed, 49 insertions(+), 18 deletions(-)

diff --git a/SpiceXPI/src/plugin/controller-unix.cpp b/SpiceXPI/src/plugin/controller-unix.cpp
index 504a8ef..743e00b 100644
--- a/SpiceXPI/src/plugin/controller-unix.cpp
+++ b/SpiceXPI/src/plugin/controller-unix.cpp
@@ -139,6 +139,20 @@ int SpiceController::Connect(const int nRetries)
     return rc;
 }
 
+void SpiceController::GetClientPaths(GStrv *client_argv, GStrv *fallback_argv)
+{
+    if (client_argv != NULL) {
+        *client_argv = g_new0(char *, 2);
+        (*client_argv)[0] = g_strdup("/usr/libexec/spice-xpi-client");
+    }
+
+    if (fallback_argv != NULL) {
+        *client_argv = g_new0(char *, 3);
+        (*client_argv)[0] = g_strdup("/usr/bin/spicec");
+        (*client_argv)[1] = g_strdup("--controller");
+    }
+}
+
 void SpiceController::SetupControllerPipe(GStrv &env)
 {
     std::string socket_file(this->m_tmp_dir);
@@ -209,42 +223,58 @@ void SpiceController::WaitForPid(GPid pid)
 
 gpointer SpiceController::ClientThread(gpointer data)
 {
-    char *spice_xpi_argv[] = { "/usr/libexec/spice-xpi-client", NULL };
     SpiceController *fake_this = (SpiceController *)data;
     gchar **env = g_get_environ();
     GPid pid;
-    gboolean spawned;
+    gboolean spawned = FALSE;
     GError *error = NULL;
+    GStrv client_argv;
+    GStrv fallback_argv;
+    fake_this->GetClientPaths(&client_argv, &fallback_argv);
 
+    {
+        char *argv_str = g_strjoinv(" ", client_argv);
+        g_warning("main client cmdline: %s", argv_str);
+        g_free(argv_str);
+        argv_str = g_strjoinv(" ", fallback_argv);
+        g_warning("fallback client cmdline: %s", argv_str);
+        g_free(argv_str);
+    }
 
     fake_this->SetupControllerPipe(env);
 
     if (!fake_this->m_proxy.empty())
         env = g_environ_setenv(env, "SPICE_PROXY", fake_this->m_proxy.c_str(), TRUE);
 
-    spawned = g_spawn_async(NULL,
-                            spice_xpi_argv, env,
-                            G_SPAWN_DO_NOT_REAP_CHILD,
-                            NULL, NULL, /* child_func, child_arg */
-                            &pid, &error);
-    if (error != NULL) {
-        g_warning("failed to start spice-xpi-client: %s", error->message);
-        g_clear_error(&error);
+    if (client_argv != NULL) {
+        spawned = g_spawn_async(NULL,
+                                client_argv, env,
+                                G_SPAWN_DO_NOT_REAP_CHILD,
+                                NULL, NULL, /* child_func, child_arg */
+                                &pid, &error);
+        if (error != NULL) {
+            g_warning("failed to start %s: %s", client_argv[0], error->message);
+            g_warn_if_fail(spawned == FALSE);
+            g_clear_error(&error);
+        }
     }
-    if (!spawned) {
+    if (!spawned && (fallback_argv != NULL)) {
         // TODO: temporary fallback for backward compatibility
-        char *spicec_argv[] = { "/usr/bin/spicec", "--controller", NULL };
-        g_message("failed to run spice-xpi-client, running spicec instead");
-        spawned = g_spawn_async(NULL, spicec_argv, env,
+        g_message("failed to run preferred client, running fallback client instead");
+        spawned = g_spawn_async(NULL, fallback_argv, env,
                                 G_SPAWN_DO_NOT_REAP_CHILD,
                                 NULL, NULL, /* child_func, child_arg */
                                 &pid, &error);
-    }
-    if (error != NULL) {
-        g_warning("failed to start spice-xpi-client: %s", error->message);
-        g_clear_error(&error);
+        if (error != NULL) {
+            g_warning("failed to start %s: %s", fallback_argv[0], error->message);
+            g_warn_if_fail(spawned == FALSE);
+            g_clear_error(&error);
+        }
     }
     g_strfreev(env);
+    g_strfreev(client_argv);
+    g_strfreev(fallback_argv);
+
     if (!spawned) {
         g_critical("ERROR failed to run spicec fallback");
         return NULL;
diff --git a/SpiceXPI/src/plugin/controller.h b/SpiceXPI/src/plugin/controller.h
index f47a921..de4516c 100644
--- a/SpiceXPI/src/plugin/controller.h
+++ b/SpiceXPI/src/plugin/controller.h
@@ -90,6 +90,7 @@ private:
     int Connect();
     void WaitForPid(GPid pid);
     void SetupControllerPipe(GStrv &env);
+    void GetClientPaths(GStrv *client_argv, GStrv *fallback_argv);
     static void ChildExited(GPid pid, gint status, gpointer user_data);
     static gpointer ClientThread(gpointer data);
 
-- 
1.8.1.4

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