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From c2eb29efe61ffe88d3aff449446a9ac0f0f045a5 Mon Sep 17 00:00:00 2001
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From: Richard Jones <rjones@redhat.com>
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Date: Tue, 2 Jun 2015 09:46:37 +0200
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Subject: [PATCH 3/4] block: Allow JSON filenames
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Message-id: <1433238397-2500-3-git-send-email-rjones@redhat.com>
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Patchwork-id: 65279
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O-Subject: [RHEL-7.2 qemu-kvm PATCH 2/2] block: Allow JSON filenames
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Bugzilla: 1226697
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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From: Max Reitz <mreitz@redhat.com>
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If the filename given to bdrv_open() is prefixed with "json:", parse the
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rest as a JSON object and merge the result into the options QDict. If
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there are conflicts, the options QDict takes precedence.
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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block.c | 41 +++++++++++++++++++++++++++++++++++++++++
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1 file changed, 41 insertions(+)
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diff --git a/block.c b/block.c
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index 45543d5..f2caf20 100644
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--- a/block.c
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+++ b/block.c
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@@ -1085,6 +1085,33 @@ static void extract_subqdict(QDict *src, QDict **dst, const char *start)
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}
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}
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+static QDict *parse_json_filename(const char *filename, Error **errp)
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+{
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+ QObject *options_obj;
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+ QDict *options;
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+ int ret;
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+
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+ ret = strstart(filename, "json:", &filename);
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+ assert(ret);
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+
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+ options_obj = qobject_from_json(filename);
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+ if (!options_obj) {
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+ error_setg(errp, "Could not parse the JSON options");
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+ return NULL;
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+ }
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+
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+ if (qobject_type(options_obj) != QTYPE_QDICT) {
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+ qobject_decref(options_obj);
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+ error_setg(errp, "Invalid JSON object given");
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+ return NULL;
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+ }
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+
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+ options = qobject_to_qdict(options_obj);
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+ qdict_flatten(options);
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+
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+ return options;
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+}
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+
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/*
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* Opens a disk image (raw, qcow2, vmdk, ...)
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*
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@@ -1109,6 +1136,20 @@ int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options,
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options = qdict_new();
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}
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+ if (filename && g_str_has_prefix(filename, "json:")) {
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+ QDict *json_options = parse_json_filename(filename, &local_err);
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+ if (local_err) {
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+ ret = -EINVAL;
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+ goto fail;
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+ }
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+
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+ /* Options given in the filename have lower priority than options
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+ * specified directly */
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+ qdict_join(options, json_options, false);
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+ QDECREF(json_options);
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+ filename = NULL;
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+ }
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+
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bs->options = options;
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options = qdict_clone_shallow(options);
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--
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1.8.3.1
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