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qemu-img: introduce --target-image-opts for 'convert' command

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The '--image-opts' flag indicates whether the source filename
includes options. The target filename has to remain in the
plain filename format though, since it needs to be passed to
bdrv_create().  When using --skip-create though, it would be
possible to use image-opts syntax. This adds --target-image-opts
to indicate that the target filename includes options. Currently
this mandates use of the --skip-create flag too.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-id: 20170515164712.6643-4-berrange@redhat.com
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Daniel P. Berrange 2017-05-15 17:47:11 +01:00 committed by Max Reitz
parent ea204ddac7
commit 305b4c60f2
3 changed files with 70 additions and 32 deletions
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4
qemu-img-cmds.hx
View File

@ -40,9 +40,9 @@ STEXI
ETEXI
DEF("convert", img_convert,
"convert [--object objectdef] [--image-opts] [-U] [-c] [-p] [-q] [-n] [-f fmt] [-t cache] [-T src_cache] [-O output_fmt] [-B backing_file] [-o options] [-s snapshot_id_or_name] [-l snapshot_param] [-S sparse_size] [-m num_coroutines] [-W] filename [filename2 [...]] output_filename")
"convert [--object objectdef] [--image-opts] [--target-image-opts] [-U] [-c] [-p] [-q] [-n] [-f fmt] [-t cache] [-T src_cache] [-O output_fmt] [-B backing_file] [-o options] [-s snapshot_id_or_name] [-l snapshot_param] [-S sparse_size] [-m num_coroutines] [-W] filename [filename2 [...]] output_filename")
STEXI
@item convert [--object @var{objectdef}] [--image-opts] [-U] [-c] [-p] [-q] [-n] [-f @var{fmt}] [-t @var{cache}] [-T @var{src_cache}] [-O @var{output_fmt}] [-B @var{backing_file}] [-o @var{options}] [-s @var{snapshot_id_or_name}] [-l @var{snapshot_param}] [-S @var{sparse_size}] [-m @var{num_coroutines}] [-W] @var{filename} [@var{filename2} [...]] @var{output_filename}
@item convert [--object @var{objectdef}] [--image-opts] [--target-image-opts] [-U] [-c] [-p] [-q] [-n] [-f @var{fmt}] [-t @var{cache}] [-T @var{src_cache}] [-O @var{output_fmt}] [-B @var{backing_file}] [-o @var{options}] [-s @var{snapshot_id_or_name}] [-l @var{snapshot_param}] [-S @var{sparse_size}] [-m @var{num_coroutines}] [-W] @var{filename} [@var{filename2} [...]] @var{output_filename}
ETEXI
DEF("dd", img_dd,

86
qemu-img.c
View File

@ -60,6 +60,7 @@ enum {
OPTION_PATTERN = 260,
OPTION_FLUSH_INTERVAL = 261,
OPTION_NO_DRAIN = 262,
OPTION_TARGET_IMAGE_OPTS = 263,
};
typedef enum OutputFormat {
@ -1913,10 +1914,10 @@ static int convert_do_copy(ImgConvertState *s)
static int img_convert(int argc, char **argv)
{
int c, bs_i, flags, src_flags = 0;
const char *fmt = NULL, *out_fmt = "raw", *cache = "unsafe",
const char *fmt = NULL, *out_fmt = NULL, *cache = "unsafe",
*src_cache = BDRV_DEFAULT_CACHE, *out_baseimg = NULL,
*out_filename, *out_baseimg_param, *snapshot_name = NULL;
BlockDriver *drv, *proto_drv;
BlockDriver *drv = NULL, *proto_drv = NULL;
BlockDriverInfo bdi;
BlockDriverState *out_bs;
QemuOpts *opts = NULL, *sn_opts = NULL;
@ -1924,7 +1925,7 @@ static int img_convert(int argc, char **argv)
char *options = NULL;
Error *local_err = NULL;
bool writethrough, src_writethrough, quiet = false, image_opts = false,
skip_create = false, progress = false;
skip_create = false, progress = false, tgt_image_opts = false;
int64_t ret = -EINVAL;
bool force_share = false;
@ -1942,6 +1943,7 @@ static int img_convert(int argc, char **argv)
{"object", required_argument, 0, OPTION_OBJECT},
{"image-opts", no_argument, 0, OPTION_IMAGE_OPTS},
{"force-share", no_argument, 0, 'U'},
{"target-image-opts", no_argument, 0, OPTION_TARGET_IMAGE_OPTS},
{0, 0, 0, 0}
};
c = getopt_long(argc, argv, ":hf:O:B:ce6o:s:l:S:pt:T:qnm:WU",
@ -2062,9 +2064,16 @@ static int img_convert(int argc, char **argv)
case OPTION_IMAGE_OPTS:
image_opts = true;
break;
case OPTION_TARGET_IMAGE_OPTS:
tgt_image_opts = true;
break;
}
}
if (!out_fmt && !tgt_image_opts) {
out_fmt = "raw";
}
if (qemu_opts_foreach(&qemu_object_opts,
user_creatable_add_opts_foreach,
NULL, NULL)) {
@ -2076,12 +2085,22 @@ static int img_convert(int argc, char **argv)
goto fail_getopt;
}
if (tgt_image_opts && !skip_create) {
error_report("--target-image-opts requires use of -n flag");
goto fail_getopt;
}
s.src_num = argc - optind - 1;
out_filename = s.src_num >= 1 ? argv[argc - 1] : NULL;
if (options && has_help_option(options)) {
ret = print_block_option_help(out_filename, out_fmt);
goto fail_getopt;
if (out_fmt) {
ret = print_block_option_help(out_filename, out_fmt);
goto fail_getopt;
} else {
error_report("Option help requires a format be specified");
goto fail_getopt;
}
}
if (s.src_num < 1) {
@ -2146,22 +2165,22 @@ static int img_convert(int argc, char **argv)
goto out;
}
/* Find driver and parse its options */
drv = bdrv_find_format(out_fmt);
if (!drv) {
error_report("Unknown file format '%s'", out_fmt);
ret = -1;
goto out;
}
proto_drv = bdrv_find_protocol(out_filename, true, &local_err);
if (!proto_drv) {
error_report_err(local_err);
ret = -1;
goto out;
}
if (!skip_create) {
/* Find driver and parse its options */
drv = bdrv_find_format(out_fmt);
if (!drv) {
error_report("Unknown file format '%s'", out_fmt);
ret = -1;
goto out;
}
proto_drv = bdrv_find_protocol(out_filename, true, &local_err);
if (!proto_drv) {
error_report_err(local_err);
ret = -1;
goto out;
}
if (!drv->create_opts) {
error_report("Format driver '%s' does not support image creation",
drv->format_name);
@ -2218,7 +2237,7 @@ static int img_convert(int argc, char **argv)
const char *preallocation =
qemu_opt_get(opts, BLOCK_OPT_PREALLOC);
if (!drv->bdrv_co_pwritev_compressed) {
if (drv && !drv->bdrv_co_pwritev_compressed) {
error_report("Compression not supported for this file format");
ret = -1;
goto out;
@ -2258,19 +2277,30 @@ static int img_convert(int argc, char **argv)
goto out;
}
/* XXX we should allow --image-opts to trigger use of
* img_open() here, but then we have trouble with
* the bdrv_create() call which takes different params.
* Not critical right now, so fix can wait...
*/
s.target = img_open_file(out_filename, out_fmt, flags, writethrough, quiet,
false);
if (skip_create) {
s.target = img_open(tgt_image_opts, out_filename, out_fmt,
flags, writethrough, quiet, false);
} else {
/* TODO ultimately we should allow --target-image-opts
* to be used even when -n is not given.
* That has to wait for bdrv_create to be improved
* to allow filenames in option syntax
*/
s.target = img_open_file(out_filename, out_fmt, flags,
writethrough, quiet, false);
}
if (!s.target) {
ret = -1;
goto out;
}
out_bs = blk_bs(s.target);
if (s.compressed && !out_bs->drv->bdrv_co_pwritev_compressed) {
error_report("Compression not supported for this file format");
ret = -1;
goto out;
}
/* increase bufsectors from the default 4096 (2M) if opt_transfer
* or discard_alignment of the out_bs is greater. Limit to 32768 (16MB)
* as maximum. */

12
qemu-img.texi
View File

@ -45,9 +45,17 @@ keys.
@item --image-opts
Indicates that the @var{filename} parameter is to be interpreted as a
Indicates that the source @var{filename} parameter is to be interpreted as a
full option string, not a plain filename. This parameter is mutually
exclusive with the @var{-f} and @var{-F} parameters.
exclusive with the @var{-f} parameter.
@item --target-image-opts
Indicates that the @var{output_filename} parameter(s) are to be interpreted as
a full option string, not a plain filename. This parameter is mutually
exclusive with the @var{-O} parameters. It is currently required to also use
the @var{-n} parameter to skip image creation. This restriction may be relaxed
in a future release.
@item fmt
is the disk image format. It is guessed automatically in most cases. See below