[Qemu-devel] [PATCH V4 4/5] qemu-img: add -l for snapshot in convert

[Wenchao Xia]

Now qemu-img convert have similar options as qemu-nbd for internal
snapshot.

Signed-off-by: Wenchao Xia <address@hidden>
---
 qemu-img-cmds.hx |    2 +-
 qemu-img.c       |   45 ++++++++++++++++++++++++++++++++++++---------
 qemu-img.texi    |   12 ++++++++----
 3 files changed, 45 insertions(+), 14 deletions(-)

diff --git a/qemu-img-cmds.hx b/qemu-img-cmds.hx
index da1d965..9a8153b 100644
--- a/qemu-img-cmds.hx
+++ b/qemu-img-cmds.hx
@@ -34,7 +34,7 @@ STEXI
 ETEXI
 
 DEF("convert", img_convert,
-    "convert [-c] [-p] [-q] [-n] [-f fmt] [-t cache] [-O output_fmt] [-o 
options] [-s snapshot_name] [-S sparse_size] filename [filename2 [...]] 
output_filename")
+    "convert [-c] [-p] [-q] [-n] [-f fmt] [-t cache] [-O output_fmt] [-o 
options] [-s snapshot_id_or_name] [-l snapshot_param] [-S sparse_size] filename 
[filename2 [...]] output_filename")
 STEXI
 @item convert [-c] [-p] [-q] [-n] [-f @var{fmt}] [-t @var{cache}] [-O 
@var{output_fmt}] [-o @var{options}] [-s @var{snapshot_name}] [-S 
@var{sparse_size}] @var{filename} address@hidden [...]] @var{output_filename}
 ETEXI
diff --git a/qemu-img.c b/qemu-img.c
index 6df58ed..c54d58c 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -93,6 +93,11 @@ static void help(void)
            "  'options' is a comma separated list of format specific options 
in a\n"
            "    name=value format. Use -o ? for an overview of the options 
supported by the\n"
            "    used format\n"
+           "  'snapshot_param' is param used for internal snapshot, format\n"
+           "    is 'snapshot.id=[ID],snapshot.name=[NAME]', or\n"
+           "    '[ID_OR_NAME]'\n"
+           "  'snapshot_id_or_name' is deprecated, use 'snapshot_param'\n"
+           "    instead\n"
            "  '-c' indicates that target image must be compressed (qcow format 
only)\n"
            "  '-u' enables unsafe rebasing. It is assumed that old and new 
backing file\n"
            "       match exactly. The image doesn't need a working backing 
file before\n"
@@ -1140,6 +1145,7 @@ static int img_convert(int argc, char **argv)
     int min_sparse = 8; /* Need at least 4k of zeros for sparse detection */
     bool quiet = false;
     Error *local_err = NULL;
+    QemuOpts *sn_opts = NULL;
 
     fmt = NULL;
     out_fmt = "raw";
@@ -1148,7 +1154,7 @@ static int img_convert(int argc, char **argv)
     compress = 0;
     skip_create = 0;
     for(;;) {
-        c = getopt(argc, argv, "f:O:B:s:hce6o:pS:t:qn");
+        c = getopt(argc, argv, "f:O:B:s:hce6o:pS:t:qnl:");
         if (c == -1) {
             break;
         }
@@ -1183,6 +1189,19 @@ static int img_convert(int argc, char **argv)
         case 's':
             snapshot_name = optarg;
             break;
+        case 'l':
+            if (strncmp(optarg, SNAPSHOT_OPT_BASE, strlen(SNAPSHOT_OPT_BASE))
+                == 0) {
+                sn_opts = qemu_opts_parse(&internal_snapshot_opts, optarg, 0);
+                if (!sn_opts) {
+                    error_report("Failed in parsing snapshot param '%s'",
+                                 optarg);
+                    return 1;
+                }
+            } else {
+                snapshot_name = optarg;
+            }
+            break;
         case 'S':
         {
             int64_t sval;
@@ -1254,7 +1273,12 @@ static int img_convert(int argc, char **argv)
         total_sectors += bs_sectors;
     }
 
-    if (snapshot_name != NULL) {
+    if (sn_opts) {
+        ret = bdrv_snapshot_load_tmp(bs[0],
+                                     qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID),
+                                     qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME),
+                                     &local_err);
+    } else if (snapshot_name != NULL) {
         if (bs_n > 1) {
             error_report("No support for concatenating multiple snapshot");
             ret = -1;
@@ -1262,13 +1286,13 @@ static int img_convert(int argc, char **argv)
         }
 
         bdrv_snapshot_load_tmp_by_id_or_name(bs[0], snapshot_name, &local_err);
-        if (error_is_set(&local_err)) {
-            error_report("Failed to load snapshot: %s",
-                         error_get_pretty(local_err));
-            error_free(local_err);
-            ret = -1;
-            goto out;
-        }
+    }
+    if (error_is_set(&local_err)) {
+        error_report("Failed to load snapshot: %s",
+                     error_get_pretty(local_err));
+        error_free(local_err);
+        ret = -1;
+        goto out;
     }
 
     /* Find driver and parse its options */
@@ -1559,6 +1583,9 @@ out:
     free_option_parameters(create_options);
     free_option_parameters(param);
     qemu_vfree(buf);
+    if (sn_opts) {
+        qemu_opts_del(sn_opts);
+    }
     if (out_bs) {
         bdrv_unref(out_bs);
     }
diff --git a/qemu-img.texi b/qemu-img.texi
index 768054e..fbdbfa7 100644
--- a/qemu-img.texi
+++ b/qemu-img.texi
@@ -46,7 +46,11 @@ is the destination disk image filename
 is a comma separated list of format specific options in a
 name=value format. Use @code{-o ?} for an overview of the options supported
 by the used format or see the format descriptions below for details.
-
address@hidden snapshot_param
+is param used for internal snapshot, format is
+'snapshot.id=[ID],snapshot.name=[NAME]' or '[ID_OR_NAME]'
address@hidden snapshot_id_or_name
+is deprecated, use snapshot_param instead
 
 @item -c
 indicates that target image must be compressed (qcow format only)
@@ -179,10 +183,10 @@ Error on reading data
 
 @end table
 
address@hidden convert [-c] [-p] [-n] [-f @var{fmt}] [-t @var{cache}] [-O 
@var{output_fmt}] [-o @var{options}] [-s @var{snapshot_name}] [-S 
@var{sparse_size}] @var{filename} address@hidden [...]] @var{output_filename}
address@hidden convert [-c] [-p] [-n] [-f @var{fmt}] [-t @var{cache}] [-O 
@var{output_fmt}] [-o @var{options}] [-s @var{snapshot_id_or_name}] [-l 
@var{snapshot_param}] [-S @var{sparse_size}] @var{filename} address@hidden 
[...]] @var{output_filename}
 
-Convert the disk image @var{filename} or a snapshot @var{snapshot_name} to 
disk image @var{output_filename}
-using format @var{output_fmt}. It can be optionally compressed (@code{-c}
+Convert the disk image @var{filename} or a snapshot 
@var{snapshot_param}(@var{snapshot_id_or_name} is deprecated)
+to disk image @var{output_filename} using format @var{output_fmt}. It can be 
optionally compressed (@code{-c}
 option) or use any format specific options like encryption (@code{-o} option).
 
 Only the formats @code{qcow} and @code{qcow2} support compression. The
-- 
1.7.1