acpi unit-test: extract iasl executable from configuration

The test checked if iasl is installed by running "iasl"
and checking the error output.
It is better to use the iasl executable as appears
in configuration.
Signed-off-by: NMarcel Apfelbaum <marcel.a@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

tests/acpi-test.c

@@ -127,6 +127,11 @@ static uint8_t boot_sector[0x7e000] = {
 
 static const char *disk = "tests/acpi-test-disk.raw";
 static const char *data_dir = "tests/acpi-test-data";
+#ifdef CONFIG_IASL
+static const char *iasl = stringify(CONFIG_IASL);
+#else
+static const char *iasl;
+#endif
 
 static void free_test_data(test_data *data)
 {
@@ -358,26 +363,6 @@ static void test_acpi_ssdt_tables(test_data *data)
     }
 }
 
-static bool iasl_installed(void)
-{
-    gchar *out = NULL, *out_err = NULL;
-    bool ret;
-
-    /* pass 'out' and 'out_err' in order to be redirected */
-    ret = g_spawn_command_line_sync("iasl", &out, &out_err, NULL, NULL);
-
-    if (out_err) {
-        ret = ret && (out_err[0] == '\0');
-        g_free(out_err);
-    }
-
-    if (out) {
-        g_free(out);
-    }
-
-    return ret;
-}
-
 static void dump_aml_files(test_data *data)
 {
     AcpiSdtTable *sdt;
@@ -406,7 +391,7 @@ static void load_asl(GArray *sdts, AcpiSdtTable *sdt)
 {
     AcpiSdtTable *temp;
     GError *error = NULL;
-    GString *command_line = g_string_new("'iasl' ");
+    GString *command_line = g_string_new(iasl);
     gint fd;
     gchar *out, *out_err;
     gboolean ret;
@@ -417,7 +402,7 @@ static void load_asl(GArray *sdts, AcpiSdtTable *sdt)
     close(fd);
 
     /* build command line */
-    g_string_append_printf(command_line, "-p %s ", sdt->asl_file);
+    g_string_append_printf(command_line, " -p %s ", sdt->asl_file);
     for (i = 0; i < 2; ++i) { /* reference DSDT and SSDT */
         temp = &g_array_index(sdts, AcpiSdtTable, i);
         g_string_append_printf(command_line, "-e %s ", temp->aml_file);
@@ -571,7 +556,7 @@ static void test_acpi_one(const char *params, test_data *data)
     test_acpi_dsdt_table(data);
     test_acpi_ssdt_tables(data);
 
-    if (iasl_installed()) {
+    if (iasl) {
         test_acpi_asl(data);
     }