[Qemu-devel] [PATCH V11 14/17] hmp: add function hmp_info_snapshots()

[Wenchao Xia <xiawenc@linux.vnet.ibm.com>]

  This function will simply call qmp interface qmp_query_snapshots()
added in last commit and then dump information in monitor console.
  To get snapshot info, Now qemu and qemu-img both call block layer
function bdrv_query_snapshot_info_list() in their calling path, and
then they just translate the qmp object got to strings in stdout or
monitor console.

Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
---
 hmp.c |   48 ++++++++++++++++++++++++++++++++++++++++++++++++
 hmp.h |    1 +
 2 files changed, 49 insertions(+), 0 deletions(-)

diff --git a/hmp.c b/hmp.c
index dbe9b90..89e1aaf 100644
--- a/hmp.c
+++ b/hmp.c
@@ -22,6 +22,7 @@
 #include "qemu/sockets.h"
 #include "monitor/monitor.h"
 #include "ui/console.h"
+#include "block/qapi.h"
 
 static void hmp_handle_error(Monitor *mon, Error **errp)
 {
@@ -653,6 +654,53 @@ void hmp_info_tpm(Monitor *mon, const QDict *qdict)
     qapi_free_TPMInfoList(info_list);
 }
 
+/* assume list is valid */
+static void monitor_dump_snapshotinfolist(Monitor *mon, SnapshotInfoList *list)
+{
+    SnapshotInfoList *elem;
+    GString *buf = g_string_sized_new(1024);
+
+    bdrv_snapshot_dump(buf, NULL);
+    g_string_append_printf(buf, "\n");
+
+    for (elem = list; elem; elem = elem->next) {
+        QEMUSnapshotInfo sn = {
+            .vm_state_size = elem->value->vm_state_size,
+            .date_sec = elem->value->date_sec,
+            .date_nsec = elem->value->date_nsec,
+            .vm_clock_nsec = elem->value->vm_clock_sec * 1000000000ULL +
+                             elem->value->vm_clock_nsec,
+        };
+        pstrcpy(sn.id_str, sizeof(sn.id_str), elem->value->id);
+        pstrcpy(sn.name, sizeof(sn.name), elem->value->name);
+        bdrv_snapshot_dump(buf, &sn);
+        g_string_append_printf(buf, "\n");
+    }
+
+    monitor_printf(mon, "%s", buf->str);
+    g_string_free(buf, true);
+}
+
+void hmp_info_snapshots(Monitor *mon, const QDict *qdict)
+{
+    Error *err = NULL;
+    SnapshotInfoList *list;
+
+    list = qmp_query_snapshots(&err);
+    if (error_is_set(&err)) {
+        hmp_handle_error(mon, &err);
+        return;
+    }
+
+    if (list == NULL) {
+        monitor_printf(mon, "There is no suitable snapshot available\n");
+        return;
+    }
+
+    monitor_dump_snapshotinfolist(mon, list);
+    qapi_free_SnapshotInfoList(list);
+}
+
 void hmp_quit(Monitor *mon, const QDict *qdict)
 {
     monitor_suspend(mon);
diff --git a/hmp.h b/hmp.h
index 80e8b41..1172c47 100644
--- a/hmp.h
+++ b/hmp.h
@@ -37,6 +37,7 @@ void hmp_info_balloon(Monitor *mon, const QDict *qdict);
 void hmp_info_pci(Monitor *mon, const QDict *qdict);
 void hmp_info_block_jobs(Monitor *mon, const QDict *qdict);
 void hmp_info_tpm(Monitor *mon, const QDict *qdict);
+void hmp_info_snapshots(Monitor *mon, const QDict *qdict);
 void hmp_quit(Monitor *mon, const QDict *qdict);
 void hmp_stop(Monitor *mon, const QDict *qdict);
 void hmp_system_reset(Monitor *mon, const QDict *qdict);
-- 
1.7.1