[Qemu-devel] [PATCH 12/27] hmp: hmp_change(): don't use error_get_field()

[Luiz Capitulino <lcapitulino@redhat.com>]

Use the 'device' passed by the user and call qmp_query_block() to
get the 'filename' info.

error_get_field() is going to be dropped by a future commit.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 hmp.c | 37 ++++++++++++++++++++++++++++---------
 1 file changed, 28 insertions(+), 9 deletions(-)

diff --git a/hmp.c b/hmp.c
index a906f8a..435c9cd 100644
--- a/hmp.c
+++ b/hmp.c
@@ -783,17 +783,35 @@ static void hmp_change_read_arg(Monitor *mon, const char *password,
 static void cb_hmp_change_bdrv_pwd(Monitor *mon, const char *password,
                                    void *opaque)
 {
-    Error *encryption_err = opaque;
+    char *device = opaque;
     Error *err = NULL;
-    const char *device;
-
-    device = error_get_field(encryption_err, "device");
 
     qmp_block_passwd(device, password, &err);
     hmp_handle_error(mon, &err);
-    error_free(encryption_err);
 
     monitor_read_command(mon, 1);
+    g_free(device);
+}
+
+static char *get_device_file(const char *device)
+{
+    BlockInfoList *bdev_list, *bdev;
+    char *ret;
+
+    bdev_list = qmp_query_block(NULL);
+    for (bdev = bdev_list; bdev; bdev = bdev->next) {
+        if (!strcmp(bdev->value->device, device)) {
+            break;
+        }
+    }
+
+    assert(bdev);
+    assert(bdev->value->has_inserted);
+
+    ret = g_strdup(bdev->value->inserted->file);
+    qapi_free_BlockInfoList(bdev_list);
+
+    return ret;
 }
 
 void hmp_change(Monitor *mon, const QDict *qdict)
@@ -814,9 +832,9 @@ void hmp_change(Monitor *mon, const QDict *qdict)
 
     qmp_change(device, target, !!arg, arg, &err);
     if (error_is_type(err, QERR_DEVICE_ENCRYPTED)) {
-        monitor_printf(mon, "%s (%s) is encrypted.\n",
-                       error_get_field(err, "device"),
-                       error_get_field(err, "filename"));
+        char *filename = get_device_file(device);
+        monitor_printf(mon, "%s (%s) is encrypted.\n", device, filename);
+        g_free(filename);
         if (!monitor_get_rs(mon)) {
             monitor_printf(mon,
                     "terminal does not support password prompting\n");
@@ -824,9 +842,10 @@ void hmp_change(Monitor *mon, const QDict *qdict)
             return;
         }
         readline_start(monitor_get_rs(mon), "Password: ", 1,
-                       cb_hmp_change_bdrv_pwd, err);
+                       cb_hmp_change_bdrv_pwd, (void *) g_strdup(device));
         return;
     }
+
     hmp_handle_error(mon, &err);
 }
 
-- 
1.7.11.2.249.g31c7954.dirty