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qemu-img: add -l for snapshot in convert

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

Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Wenchao Xia 2013-12-04 17:10:57 +08:00 committed by Stefan Hajnoczi
parent 9c468a013f
commit ef80654d0d
3 changed files with 45 additions and 15 deletions
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4
qemu-img-cmds.hx
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@ -34,9 +34,9 @@ STEXI
ETEXI ETEXI
DEF("convert", img_convert, 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 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} [@var{filename2} [...]] @var{output_filename} @item convert [-c] [-p] [-q] [-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} [@var{filename2} [...]] @var{output_filename}
ETEXI ETEXI
DEF("info", img_info, DEF("info", img_info,

32
qemu-img.c
View File

@ -93,6 +93,11 @@ static void help(void)
" 'options' is a comma separated list of format specific options in a\n" " '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" " name=value format. Use -o ? for an overview of the options supported by the\n"
" used format\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" " '-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" " '-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" " match exactly. The image doesn't need a working backing file before\n"
@ -1144,6 +1149,7 @@ static int img_convert(int argc, char **argv)
int min_sparse = 8; /* Need at least 4k of zeros for sparse detection */ int min_sparse = 8; /* Need at least 4k of zeros for sparse detection */
bool quiet = false; bool quiet = false;
Error *local_err = NULL; Error *local_err = NULL;
QemuOpts *sn_opts = NULL;
fmt = NULL; fmt = NULL;
out_fmt = "raw"; out_fmt = "raw";
@ -1152,7 +1158,7 @@ static int img_convert(int argc, char **argv)
compress = 0; compress = 0;
skip_create = 0; skip_create = 0;
for(;;) { 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) { if (c == -1) {
break; break;
} }
@ -1187,6 +1193,18 @@ static int img_convert(int argc, char **argv)
case 's': case 's':
snapshot_name = optarg; snapshot_name = optarg;
break; break;
case 'l':
if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) {
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': case 'S':
{ {
int64_t sval; int64_t sval;
@ -1258,7 +1276,12 @@ static int img_convert(int argc, char **argv)
total_sectors += bs_sectors; 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) { if (bs_n > 1) {
error_report("No support for concatenating multiple snapshot"); error_report("No support for concatenating multiple snapshot");
ret = -1; ret = -1;
@ -1266,6 +1289,7 @@ static int img_convert(int argc, char **argv)
} }
bdrv_snapshot_load_tmp_by_id_or_name(bs[0], snapshot_name, &local_err); bdrv_snapshot_load_tmp_by_id_or_name(bs[0], snapshot_name, &local_err);
}
if (error_is_set(&local_err)) { if (error_is_set(&local_err)) {
error_report("Failed to load snapshot: %s", error_report("Failed to load snapshot: %s",
error_get_pretty(local_err)); error_get_pretty(local_err));
@ -1273,7 +1297,6 @@ static int img_convert(int argc, char **argv)
ret = -1; ret = -1;
goto out; goto out;
} }
}
/* Find driver and parse its options */ /* Find driver and parse its options */
drv = bdrv_find_format(out_fmt); drv = bdrv_find_format(out_fmt);
@ -1571,6 +1594,9 @@ out:
free_option_parameters(create_options); free_option_parameters(create_options);
free_option_parameters(param); free_option_parameters(param);
qemu_vfree(buf); qemu_vfree(buf);
if (sn_opts) {
qemu_opts_del(sn_opts);
}
if (out_bs) { if (out_bs) {
bdrv_unref(out_bs); bdrv_unref(out_bs);
} }

12
qemu-img.texi
View File

@ -46,7 +46,11 @@ is the destination disk image filename
is a comma separated list of format specific options in a is a comma separated list of format specific options in a
name=value format. Use @code{-o ?} for an overview of the options supported 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. by the used format or see the format descriptions below for details.
@item snapshot_param
is param used for internal snapshot, format is
'snapshot.id=[ID],snapshot.name=[NAME]' or '[ID_OR_NAME]'
@item snapshot_id_or_name
is deprecated, use snapshot_param instead
@item -c @item -c
indicates that target image must be compressed (qcow format only) indicates that target image must be compressed (qcow format only)
@ -179,10 +183,10 @@ Error on reading data
@end table @end table
@item 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} [@var{filename2} [...]] @var{output_filename} @item 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} [@var{filename2} [...]] @var{output_filename}
Convert the disk image @var{filename} or a snapshot @var{snapshot_name} to disk image @var{output_filename} Convert the disk image @var{filename} or a snapshot @var{snapshot_param}(@var{snapshot_id_or_name} is deprecated)
using format @var{output_fmt}. It can be optionally compressed (@code{-c} 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). option) or use any format specific options like encryption (@code{-o} option).
Only the formats @code{qcow} and @code{qcow2} support compression. The Only the formats @code{qcow} and @code{qcow2} support compression. The