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Re: [Qemu-devel] [PATCH] let qemu-img info genereate json output
From: |
Anthony Liguori |
Subject: |
Re: [Qemu-devel] [PATCH] let qemu-img info genereate json output |
Date: |
Fri, 27 Jul 2012 08:50:43 -0500 |
User-agent: |
Notmuch/0.13.2+93~ged93d79 (http://notmuchmail.org) Emacs/23.3.1 (x86_64-pc-linux-gnu) |
Wenchao Xia <address@hidden> writes:
> This patch would add option -j in qemu-img info command, which
> would generate json output in stdout.
This is a great idea.
>
> Signed-off-by: Wenchao Xia <address@hidden>
> ---
> qemu-img.c | 306 +++++++++++++++++++++++++++++++++++++++++++++++++++--------
> 1 files changed, 264 insertions(+), 42 deletions(-)
>
> diff --git a/qemu-img.c b/qemu-img.c
> index 80cfb9b..a514c17 100644
> --- a/qemu-img.c
> +++ b/qemu-img.c
> @@ -33,6 +33,9 @@
> #include <windows.h>
> #endif
>
> +#include "qint.h"
> +#include "qjson.h"
> +
> typedef struct img_cmd_t {
> const char *name;
> int (*handler)(int argc, char **argv);
> @@ -84,6 +87,7 @@ static void help(void)
> " '-p' show progress of command (only certain commands)\n"
> " '-S' indicates the consecutive number of bytes that must
> contain only zeros\n"
> " for qemu-img to create a sparse image during conversion\n"
> + " '-j' try get json output, which would be in stdout,
> only valid in info command\n"
I think an --format=json option would be a bit more extensible and
better matches what most tools are doing these days.
> "\n"
> "Parameters to check subcommand:\n"
> " '-r' tries to repair any inconsistencies that are found during
> the check.\n"
> @@ -1102,21 +1106,210 @@ static void dump_snapshots(BlockDriverState *bs)
> g_free(sn_tab);
> }
>
> +/* string must be allocated on heap */
> +struct img_infos {
CodingStyle
> + char *filename;
> + char *fmt;
> + uint64_t total_sectors;
> + int64_t allocated_size;
> + int32 enc_flag;
> + BlockDriverInfo *bdi;
> + char *backing_filename;
> + char *backing_filename_full;
> + QEMUSnapshotInfo *sn_tab;
> + int nb_sns;
> +};
> +
> +static void img_infos_init(struct img_infos *pinfo)
> +{
> + memset(pinfo, 0, sizeof(struct img_infos));
> +}
> +
> +#define TRY_FREE(p) { \
> + if ((p) != NULL) { \
> + g_free((p)); \
> + (p) = NULL; \
> + } \
> +}
> +static void img_infos_uninit(struct img_infos *pinfo)
> +{
> + TRY_FREE(pinfo->filename);
> + TRY_FREE(pinfo->fmt);
> + TRY_FREE(pinfo->bdi);
> + TRY_FREE(pinfo->backing_filename);
> + TRY_FREE(pinfo->backing_filename_full);
> + TRY_FREE(pinfo->sn_tab);
> +}
> +
> +static void snapshot_info_to_list(QList *qlist, QEMUSnapshotInfo *sn)
> +{
> + char buf[128];
> + QInt *qint;
> + QString *qstr;
> + QDict *qdic = qdict_new();
> +
> + qstr = qstring_from_str(sn->id_str);
> + qdict_put_obj(qdic, "id", QOBJECT(qstr));
> + qstr = qstring_from_str(sn->name);
> + qdict_put_obj(qdic, "name", QOBJECT(qstr));
> +
> + snprintf(buf, sizeof(buf), "%ld", sn->vm_state_size);
> + qstr = qstring_from_str(buf);
> + qdict_put_obj(qdic, "vm_state_size", QOBJECT(qstr));
> +
> + qint = qint_from_int(sn->date_sec);
> + qdict_put_obj(qdic, "date_sec", QOBJECT(qint));
> + qint = qint_from_int(sn->date_nsec);
> + qdict_put_obj(qdic, "date_nsec", QOBJECT(qint));
> + snprintf(buf, sizeof(buf), "%ld", sn->vm_clock_nsec);
> + qstr = qstring_from_str(buf);
> + qdict_put_obj(qdic, "vm_clock_nsec", QOBJECT(qstr));
> + qlist_append(qlist, qdic);
> +}
No need to open code all of this. Just describe the output as a type in
qapi-schema.json. Then you can just #include "qapi-visit.h", then call
visit_type_ImageInfo passing in a QMPOutputVisitor.
You can then pass the QObject to the json code to pretty print it.
Regards,
Anthony Liguori