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qemu-nbd: allow specifying image as a set of options args

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Currently qemu-nbd allows an image filename to be passed on the
command line, but unless using the JSON format, it does not have
a way to set any options except the format eg

   qemu-nbd https://127.0.0.1/images/centos7.iso
   qemu-nbd /home/berrange/demo.qcow2

This adds a --image-opts arg that indicates that the positional
filename should be interpreted as a full option string, not
just a filename.

   qemu-nbd --image-opts driver=https,url=https://127.0.0.1/images,sslverify=off
   qemu-nbd --image-opts driver=file,filename=/home/berrange/demo.qcow2

This flag is mutually exclusive with the '-f' flag.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Daniel P. Berrange 2016-02-17 10:10:19 +00:00 committed by Kevin Wolf
parent 499afa2512
commit 77c9aaefd7
2 changed files with 44 additions and 6 deletions
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43
qemu-nbd.c
View File

@ -43,6 +43,7 @@
#define QEMU_NBD_OPT_DETECT_ZEROES 4
#define QEMU_NBD_OPT_OBJECT 5
#define QEMU_NBD_OPT_TLSCREDS 6
#define QEMU_NBD_OPT_IMAGE_OPTS 7
static NBDExport *exp;
static bool newproto;
@ -105,6 +106,7 @@ static void usage(const char *name)
" --aio=MODE set AIO mode (native or threads)\n"
" --discard=MODE set discard mode (ignore, unmap)\n"
" --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n"
" --image-opts treat FILE as a full set of image options\n"
"\n"
"Report bugs to <qemu-devel@nongnu.org>\n"
, name, NBD_DEFAULT_PORT, "DEVICE");
@ -394,6 +396,16 @@ static SocketAddress *nbd_build_socket_address(const char *sockpath,
}
static QemuOptsList file_opts = {
.name = "file",
.implied_opt_name = "file",
.head = QTAILQ_HEAD_INITIALIZER(file_opts.head),
.desc = {
/* no elements => accept any params */
{ /* end of list */ }
},
};
static QemuOptsList qemu_object_opts = {
.name = "object",
.implied_opt_name = "qom-type",
@ -475,6 +487,7 @@ int main(int argc, char **argv)
{ "object", 1, NULL, QEMU_NBD_OPT_OBJECT },
{ "export-name", 1, NULL, 'x' },
{ "tls-creds", 1, NULL, QEMU_NBD_OPT_TLSCREDS },
{ "image-opts", 0, NULL, QEMU_NBD_OPT_IMAGE_OPTS },
{ NULL, 0, NULL, 0 }
};
int ch;
@ -493,6 +506,7 @@ int main(int argc, char **argv)
QDict *options = NULL;
const char *export_name = NULL;
const char *tlscredsid = NULL;
bool imageOpts = false;
/* The client thread uses SIGTERM to interrupt the server. A signal
* handler ensures that "qemu-nbd -v -c" exits with a nice status code.
@ -672,6 +686,9 @@ int main(int argc, char **argv)
case QEMU_NBD_OPT_TLSCREDS:
tlscredsid = optarg;
break;
case QEMU_NBD_OPT_IMAGE_OPTS:
imageOpts = true;
break;
}
}
@ -800,13 +817,29 @@ int main(int argc, char **argv)
bdrv_init();
atexit(bdrv_close_all);
if (fmt) {
options = qdict_new();
qdict_put(options, "driver", qstring_from_str(fmt));
srcpath = argv[optind];
if (imageOpts) {
QemuOpts *opts;
if (fmt) {
error_report("--image-opts and -f are mutually exclusive");
exit(EXIT_FAILURE);
}
opts = qemu_opts_parse_noisily(&file_opts, srcpath, true);
if (!opts) {
qemu_opts_reset(&file_opts);
exit(EXIT_FAILURE);
}
options = qemu_opts_to_qdict(opts, NULL);
qemu_opts_reset(&file_opts);
blk = blk_new_open("hda", NULL, NULL, options, flags, &local_err);
} else {
if (fmt) {
options = qdict_new();
qdict_put(options, "driver", qstring_from_str(fmt));
}
blk = blk_new_open("hda", srcpath, NULL, options, flags, &local_err);
}
srcpath = argv[optind];
blk = blk_new_open("hda", srcpath, NULL, options, flags, &local_err);
if (!blk) {
error_reportf_err(local_err, "Failed to blk_new_open '%s': ",
argv[optind]);

7
qemu-nbd.texi
View File

@ -13,7 +13,8 @@ Export a QEMU disk image using the NBD protocol.
@c man end
@c man begin OPTIONS
@var{filename} is a disk image filename.
@var{filename} is a disk image filename, or a set of block
driver options if @var{--image-opts} is specified.
@var{dev} is an NBD device.
@ -33,6 +34,10 @@ The offset into the image
The interface to bind to (default @samp{0.0.0.0})
@item -k, --socket=@var{path}
Use a unix socket with path @var{path}
@item --image-opts
Treat @var{filename} as a set of image options, instead of a plain
filename. If this flag is specified, the @var{-f} flag should
not be used, instead the '@code{format=}' option should be set.
@item -f, --format=@var{fmt}
Force the use of the block driver for format @var{fmt} instead of
auto-detecting