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From a0520e180e6f235b8a3a531b0756e45cbfe36e15 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Tue, 18 May 2021 11:40:57 -0400
Subject: [PATCH 3/5] qemu-config: parse configuration files to a QDict
Change the parser to put the values into a QDict and pass them
to a callback. qemu_config_parse's QemuOpts creation is
itself turned into a callback function.
This is useful for -readconfig to support keyval-based options;
getting a QDict from the parser removes a roundtrip from
QDict to QemuOpts and then back to QDict.
Unfortunately there is a disadvantage in that semantic errors will
point to the last line of the group, because the entries of the QDict
do not have a location attached.
Cc: Kevin Wolf <kwolf@redhat.com>
Cc: Markus Armbruster <armbru@redhat.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210524105752.3318299-2-pbonzini@redhat.com>
---
include/qemu/config-file.h | 7 ++-
softmmu/vl.c | 4 +-
util/qemu-config.c | 97 ++++++++++++++++++++++++++------------
3 files changed, 75 insertions(+), 33 deletions(-)
diff --git a/include/qemu/config-file.h b/include/qemu/config-file.h
index 0500b36..f605423 100644
--- a/include/qemu/config-file.h
+++ b/include/qemu/config-file.h
@@ -1,6 +1,8 @@
#ifndef QEMU_CONFIG_FILE_H
#define QEMU_CONFIG_FILE_H
+typedef void QEMUConfigCB(const char *group, QDict *qdict, void *opaque, Error **errp);
+
void qemu_load_module_for_opts(const char *group);
QemuOptsList *qemu_find_opts(const char *group);
QemuOptsList *qemu_find_opts_err(const char *group, Error **errp);
@@ -14,7 +16,10 @@ void qemu_config_write(FILE *fp);
int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname,
Error **errp);
-int qemu_read_config_file(const char *filename, Error **errp);
+/* A default callback for qemu_read_config_file(). */
+void qemu_config_do_parse(const char *group, QDict *qdict, void *opaque, Error **errp);
+
+int qemu_read_config_file(const char *filename, QEMUConfigCB *f, Error **errp);
/* Parse QDict options as a replacement for a config file (allowing multiple
enumerated (0..(n-1)) configuration "sections") */
diff --git a/softmmu/vl.c b/softmmu/vl.c
index 4641f08..da5042f 100644
--- a/softmmu/vl.c
+++ b/softmmu/vl.c
@@ -2119,7 +2119,7 @@ static void qemu_read_default_config_file(Error **errp)
int ret;
g_autofree char *file = get_relocated_path(CONFIG_QEMU_CONFDIR "/qemu.conf");
- ret = qemu_read_config_file(file, errp);
+ ret = qemu_read_config_file(file, qemu_config_do_parse, errp);
if (ret < 0) {
if (ret == -ENOENT) {
error_free(*errp);
@@ -3385,7 +3385,7 @@ void qemu_init(int argc, char **argv, char **envp)
qemu_plugin_opt_parse(optarg, &plugin_list);
break;
case QEMU_OPTION_readconfig:
- qemu_read_config_file(optarg, &error_fatal);
+ qemu_read_config_file(optarg, qemu_config_do_parse, &error_fatal);
break;
case QEMU_OPTION_spice:
olist = qemu_find_opts_err("spice", NULL);
diff --git a/util/qemu-config.c b/util/qemu-config.c
index 34974c4..f6eaff9 100644
--- a/util/qemu-config.c
+++ b/util/qemu-config.c
@@ -2,6 +2,7 @@
#include "block/qdict.h" /* for qdict_extract_subqdict() */
#include "qapi/error.h"
#include "qapi/qapi-commands-misc.h"
+#include "qapi/qmp/qerror.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qlist.h"
#include "qemu/error-report.h"
@@ -351,19 +352,19 @@ void qemu_config_write(FILE *fp)
}
/* Returns number of config groups on success, -errno on error */
-int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname, Error **errp)
+static int qemu_config_foreach(FILE *fp, QEMUConfigCB *cb, void *opaque,
+ const char *fname, Error **errp)
{
- char line[1024], group[64], id[64], arg[64], value[1024];
+ char line[1024], prev_group[64], group[64], arg[64], value[1024];
Location loc;
- QemuOptsList *list = NULL;
Error *local_err = NULL;
- QemuOpts *opts = NULL;
+ QDict *qdict = NULL;
int res = -EINVAL, lno = 0;
int count = 0;
loc_push_none(&loc);
while (fgets(line, sizeof(line), fp) != NULL) {
- loc_set_file(fname, ++lno);
+ ++lno;
if (line[0] == '\n') {
/* skip empty lines */
continue;
@@ -372,39 +373,39 @@ int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname, Error *
/* comment */
continue;
}
- if (sscanf(line, "[%63s \"%63[^\"]\"]", group, id) == 2) {
- /* group with id */
- list = find_list(lists, group, &local_err);
- if (local_err) {
- error_propagate(errp, local_err);
- goto out;
+ if (line[0] == '[') {
+ QDict *prev = qdict;
+ if (sscanf(line, "[%63s \"%63[^\"]\"]", group, value) == 2) {
+ qdict = qdict_new();
+ qdict_put_str(qdict, "id", value);
+ count++;
+ } else if (sscanf(line, "[%63[^]]]", group) == 1) {
+ qdict = qdict_new();
+ count++;
}
- opts = qemu_opts_create(list, id, 1, NULL);
- count++;
- continue;
- }
- if (sscanf(line, "[%63[^]]]", group) == 1) {
- /* group without id */
- list = find_list(lists, group, &local_err);
- if (local_err) {
- error_propagate(errp, local_err);
- goto out;
+ if (qdict != prev) {
+ if (prev) {
+ cb(prev_group, prev, opaque, &local_err);
+ qobject_unref(prev);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ goto out;
+ }
+ }
+ strcpy(prev_group, group);
+ continue;
}
- opts = qemu_opts_create(list, NULL, 0, &error_abort);
- count++;
- continue;
}
+ loc_set_file(fname, lno);
value[0] = '\0';
if (sscanf(line, " %63s = \"%1023[^\"]\"", arg, value) == 2 ||
sscanf(line, " %63s = \"\"", arg) == 1) {
/* arg = value */
- if (opts == NULL) {
+ if (qdict == NULL) {
error_setg(errp, "no group defined");
goto out;
}
- if (!qemu_opt_set(opts, arg, value, errp)) {
- goto out;
- }
+ qdict_put_str(qdict, arg, value);
continue;
}
error_setg(errp, "parse error");
@@ -417,11 +418,47 @@ int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname, Error *
}
res = count;
out:
+ if (qdict) {
+ cb(group, qdict, opaque, errp);
+ qobject_unref(qdict);
+ }
loc_pop(&loc);
return res;
}
-int qemu_read_config_file(const char *filename, Error **errp)
+void qemu_config_do_parse(const char *group, QDict *qdict, void *opaque, Error **errp)
+{
+ QemuOptsList **lists = opaque;
+ const char *id = qdict_get_try_str(qdict, "id");
+ QemuOptsList *list;
+ QemuOpts *opts;
+ const QDictEntry *unrecognized;
+
+ list = find_list(lists, group, errp);
+ if (!list) {
+ return;
+ }
+
+ opts = qemu_opts_create(list, id, 1, errp);
+ if (!opts) {
+ return;
+ }
+ if (!qemu_opts_absorb_qdict(opts, qdict, errp)) {
+ return;
+ }
+ unrecognized = qdict_first(qdict);
+ if (unrecognized) {
+ error_setg(errp, QERR_INVALID_PARAMETER, unrecognized->key);
+ qemu_opts_del(opts);
+ }
+}
+
+int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname, Error **errp)
+{
+ return qemu_config_foreach(fp, qemu_config_do_parse, lists, fname, errp);
+}
+
+int qemu_read_config_file(const char *filename, QEMUConfigCB *cb, Error **errp)
{
FILE *f = fopen(filename, "r");
int ret;
@@ -431,7 +468,7 @@ int qemu_read_config_file(const char *filename, Error **errp)
return -errno;
}
- ret = qemu_config_parse(f, vm_config_groups, filename, errp);
+ ret = qemu_config_foreach(f, cb, vm_config_groups, filename, errp);
fclose(f);
return ret;
}
--
2.31.1
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