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qemu-io: add support for --object command line arg

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Allow creation of user creatable object types with qemu-io
via a new --object command line arg. This will be used to supply
passwords and/or encryption keys to the various block driver
backends via the recently added 'secret' object type.

 # printf letmein > mypasswd.txt
 # qemu-io --object secret,id=sec0,file=mypasswd.txt \
      ...other args...

Reviewed-by: Eric Blake <eblake@redhat.com>
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 10:10:16 +00:00 committed by Kevin Wolf
parent 12d5ee3a7e
commit 9ba371b634
1 changed files with 34 additions and 0 deletions
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34
qemu-io.c
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@ -18,6 +18,7 @@
#include "qemu/config-file.h"
#include "qemu/readline.h"
#include "qapi/qmp/qstring.h"
#include "qom/object_interfaces.h"
#include "sysemu/block-backend.h"
#include "block/block_int.h"
#include "trace/control.h"
@ -200,6 +201,8 @@ static void usage(const char *name)
"Usage: %s [-h] [-V] [-rsnm] [-f FMT] [-c STRING] ... [file]\n"
"QEMU Disk exerciser\n"
"\n"
" --object OBJECTDEF define an object such as 'secret' for\n"
" passwords and/or encryption keys\n"
" -c, --cmd STRING execute command with its arguments\n"
" from the given string\n"
" -f, --format FMT specifies the block driver to use\n"
@ -361,6 +364,20 @@ static void reenable_tty_echo(void)
qemu_set_tty_echo(STDIN_FILENO, true);
}
enum {
OPTION_OBJECT = 256,
};
static QemuOptsList qemu_object_opts = {
.name = "object",
.implied_opt_name = "qom-type",
.head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head),
.desc = {
{ }
},
};
int main(int argc, char **argv)
{
int readonly = 0;
@ -379,6 +396,7 @@ int main(int argc, char **argv)
{ "discard", 1, NULL, 'd' },
{ "cache", 1, NULL, 't' },
{ "trace", 1, NULL, 'T' },
{ "object", 1, NULL, OPTION_OBJECT },
{ NULL, 0, NULL, 0 }
};
int c;
@ -395,6 +413,7 @@ int main(int argc, char **argv)
qemu_init_exec_dir(argv[0]);
module_call_init(MODULE_INIT_QOM);
qemu_add_opts(&qemu_object_opts);
bdrv_init();
while ((c = getopt_long(argc, argv, sopt, lopt, &opt_index)) != -1) {
@ -446,6 +465,14 @@ int main(int argc, char **argv)
case 'h':
usage(progname);
exit(0);
case OPTION_OBJECT: {
QemuOpts *qopts = NULL;
qopts = qemu_opts_parse_noisily(&qemu_object_opts,
optarg, true);
if (!qopts) {
exit(1);
}
} break;
default:
usage(progname);
exit(1);
@ -462,6 +489,13 @@ int main(int argc, char **argv)
exit(1);
}
if (qemu_opts_foreach(&qemu_object_opts,
user_creatable_add_opts_foreach,
NULL, &local_error)) {
error_report_err(local_error);
exit(1);
}
/* initialize commands */
qemuio_add_command(&quit_cmd);
qemuio_add_command(&open_cmd);