[Qemu-devel] [PATCH v3 11/11] savevm: add force parameter to HMP command and return snapshot info

[Pavel Hrdina <phrdina@redhat.com>]

HMP command "savevm" now takes extra optional force parameter to specify
whether replace existing snapshot or not. It also returns information
about created snapshot.

Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
---
 hmp-commands.hx | 16 ++++++++--------
 hmp.c           | 18 +++++++++++++++++-
 2 files changed, 25 insertions(+), 9 deletions(-)

diff --git a/hmp-commands.hx b/hmp-commands.hx
index 382b87d..9719cc0 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -307,19 +307,19 @@ ETEXI
 
     {
         .name       = "savevm",
-        .args_type  = "name:s?",
-        .params     = "[tag|id]",
-        .help       = "save a VM snapshot. If no tag or id are provided, a new snapshot is created",
+        .args_type  = "force:-f,name:s?",
+        .params     = "[-f] [tag|id]",
+        .help       = "save a VM snapshot, to replace existing snapshot use force flag",
         .mhandler.cmd = hmp_vm_snapshot_save,
     },
 
 STEXI
-@item savevm [@var{tag}|@var{id}]
+@item savevm [@var{-f}] @var{tag}|@var{id}
 @findex savevm
-Create a snapshot of the whole virtual machine. If @var{tag} is
-provided, it is used as human readable identifier. If there is already
-a snapshot with the same @var{tag} or @var{id}, it is replaced. More info at
-@ref{vm_snapshots}.
+Create a snapshot of the whole virtual machine. Parameter "name" is optional.
+If @var{tag} is provided, it is used as human readable identifier. If there is
+already a snapshot with the same @var{tag} or @var{id}, @var{-f} flag needs to
+be specified. More info at @ref{vm_snapshots}.
 ETEXI
 
     {
diff --git a/hmp.c b/hmp.c
index b38b6ce..adf586b 100644
--- a/hmp.c
+++ b/hmp.c
@@ -1437,10 +1437,26 @@ void hmp_chardev_remove(Monitor *mon, const QDict *qdict)
 void hmp_vm_snapshot_save(Monitor *mon, const QDict *qdict)
 {
     const char *name = qdict_get_try_str(qdict, "name");
+    bool force = qdict_get_try_bool(qdict, "force", 0);
     Error *err = NULL;
     SnapshotInfo *info = NULL;
 
-    info = qmp_vm_snapshot_save(!!name, name, true, true, &err);
+    info = qmp_vm_snapshot_save(!!name, name, !!force, force, &err);
+
+    if (info) {
+        char buf[256];
+        QEMUSnapshotInfo sn = {
+            .vm_state_size = info->vm_state_size,
+            .date_sec = info->date_sec,
+            .date_nsec = info->date_nsec,
+            .vm_clock_nsec = info->vm_clock_sec * 1000000000 +
+                             info->vm_clock_nsec,
+        };
+        pstrcpy(sn.id_str, sizeof(sn.id_str), info->id);
+        pstrcpy(sn.name, sizeof(sn.name), info->name);
+        monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), &sn));
+    }
+
     qapi_free_SnapshotInfo(info);
     hmp_handle_error(mon, &err);
 }
-- 
1.8.1.4