131 lines
5.1 KiB
Diff
131 lines
5.1 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Fabian Ebner <f.ebner@proxmox.com>
|
|
Date: Mon, 7 Feb 2022 14:21:01 +0100
|
|
Subject: [PATCH] qemu-img dd: add -l option for loading a snapshot
|
|
|
|
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
|
|
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
|
|
---
|
|
docs/tools/qemu-img.rst | 6 +++---
|
|
qemu-img-cmds.hx | 4 ++--
|
|
qemu-img.c | 33 +++++++++++++++++++++++++++++++--
|
|
3 files changed, 36 insertions(+), 7 deletions(-)
|
|
|
|
diff --git a/docs/tools/qemu-img.rst b/docs/tools/qemu-img.rst
|
|
index 5e713e231d..9390d5e5cf 100644
|
|
--- a/docs/tools/qemu-img.rst
|
|
+++ b/docs/tools/qemu-img.rst
|
|
@@ -492,10 +492,10 @@ Command description:
|
|
it doesn't need to be specified separately in this case.
|
|
|
|
|
|
-.. option:: dd [--image-opts] [-U] [-f FMT] [-O OUTPUT_FMT] [-n] [bs=BLOCK_SIZE] [count=BLOCKS] [skip=BLOCKS] if=INPUT of=OUTPUT
|
|
+.. option:: dd [--image-opts] [-U] [-f FMT] [-O OUTPUT_FMT] [-n] [-l SNAPSHOT_PARAM] [bs=BLOCK_SIZE] [count=BLOCKS] [skip=BLOCKS] if=INPUT of=OUTPUT
|
|
|
|
- dd copies from *INPUT* file to *OUTPUT* file converting it from
|
|
- *FMT* format to *OUTPUT_FMT* format.
|
|
+ dd copies from *INPUT* file or snapshot *SNAPSHOT_PARAM* to *OUTPUT* file
|
|
+ converting it from *FMT* format to *OUTPUT_FMT* format.
|
|
|
|
The data is by default read and written using blocks of 512 bytes but can be
|
|
modified by specifying *BLOCK_SIZE*. If count=\ *BLOCKS* is specified
|
|
diff --git a/qemu-img-cmds.hx b/qemu-img-cmds.hx
|
|
index b5b0bb4467..36f97e1f19 100644
|
|
--- a/qemu-img-cmds.hx
|
|
+++ b/qemu-img-cmds.hx
|
|
@@ -58,9 +58,9 @@ SRST
|
|
ERST
|
|
|
|
DEF("dd", img_dd,
|
|
- "dd [--image-opts] [-U] [-f fmt] [-O output_fmt] [-n] [bs=block_size] [count=blocks] [skip=blocks] [osize=output_size] if=input of=output")
|
|
+ "dd [--image-opts] [-U] [-f fmt] [-O output_fmt] [-n] [-l snapshot_param] [bs=block_size] [count=blocks] [skip=blocks] [osize=output_size] if=input of=output")
|
|
SRST
|
|
-.. option:: dd [--image-opts] [-U] [-f FMT] [-O OUTPUT_FMT] [-n] [bs=BLOCK_SIZE] [count=BLOCKS] [skip=BLOCKS] [osize=OUTPUT_SIZE] if=INPUT of=OUTPUT
|
|
+.. option:: dd [--image-opts] [-U] [-f FMT] [-O OUTPUT_FMT] [-n] [-l SNAPSHOT_PARAM] [bs=BLOCK_SIZE] [count=BLOCKS] [skip=BLOCKS] [osize=OUTPUT_SIZE] if=INPUT of=OUTPUT
|
|
ERST
|
|
|
|
DEF("info", img_info,
|
|
diff --git a/qemu-img.c b/qemu-img.c
|
|
index 9d414d639b..e13a12137b 100644
|
|
--- a/qemu-img.c
|
|
+++ b/qemu-img.c
|
|
@@ -5016,6 +5016,7 @@ static int img_dd(int argc, char **argv)
|
|
BlockDriver *drv = NULL, *proto_drv = NULL;
|
|
BlockBackend *blk1 = NULL, *blk2 = NULL;
|
|
QemuOpts *opts = NULL;
|
|
+ QemuOpts *sn_opts = NULL;
|
|
QemuOptsList *create_opts = NULL;
|
|
Error *local_err = NULL;
|
|
bool image_opts = false;
|
|
@@ -5025,6 +5026,7 @@ static int img_dd(int argc, char **argv)
|
|
int64_t size = 0, readsize = 0;
|
|
int64_t out_pos, in_pos;
|
|
bool force_share = false, skip_create = false;
|
|
+ const char *snapshot_name = NULL;
|
|
struct DdInfo dd = {
|
|
.flags = 0,
|
|
.count = 0,
|
|
@@ -5062,7 +5064,7 @@ static int img_dd(int argc, char **argv)
|
|
{ 0, 0, 0, 0 }
|
|
};
|
|
|
|
- while ((c = getopt_long(argc, argv, ":hf:O:Un", long_options, NULL))) {
|
|
+ while ((c = getopt_long(argc, argv, ":hf:O:l:Un", long_options, NULL))) {
|
|
if (c == EOF) {
|
|
break;
|
|
}
|
|
@@ -5085,6 +5087,19 @@ static int img_dd(int argc, char **argv)
|
|
case 'n':
|
|
skip_create = true;
|
|
break;
|
|
+ case 'l':
|
|
+ if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) {
|
|
+ sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts,
|
|
+ optarg, false);
|
|
+ if (!sn_opts) {
|
|
+ error_report("Failed in parsing snapshot param '%s'",
|
|
+ optarg);
|
|
+ goto out;
|
|
+ }
|
|
+ } else {
|
|
+ snapshot_name = optarg;
|
|
+ }
|
|
+ break;
|
|
case 'U':
|
|
force_share = true;
|
|
break;
|
|
@@ -5144,11 +5159,24 @@ static int img_dd(int argc, char **argv)
|
|
if (dd.flags & C_IF) {
|
|
blk1 = img_open(image_opts, in.filename, fmt, 0, false, false,
|
|
force_share);
|
|
-
|
|
if (!blk1) {
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
+ if (sn_opts) {
|
|
+ bdrv_snapshot_load_tmp(blk_bs(blk1),
|
|
+ qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID),
|
|
+ qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME),
|
|
+ &local_err);
|
|
+ } else if (snapshot_name != NULL) {
|
|
+ bdrv_snapshot_load_tmp_by_id_or_name(blk_bs(blk1), snapshot_name,
|
|
+ &local_err);
|
|
+ }
|
|
+ if (local_err) {
|
|
+ error_reportf_err(local_err, "Failed to load snapshot: ");
|
|
+ ret = -1;
|
|
+ goto out;
|
|
+ }
|
|
}
|
|
|
|
if (dd.flags & C_OSIZE) {
|
|
@@ -5303,6 +5331,7 @@ static int img_dd(int argc, char **argv)
|
|
out:
|
|
g_free(arg);
|
|
qemu_opts_del(opts);
|
|
+ qemu_opts_del(sn_opts);
|
|
qemu_opts_free(create_opts);
|
|
blk_unref(blk1);
|
|
blk_unref(blk2);
|