From a0520e180e6f235b8a3a531b0756e45cbfe36e15 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini 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 Cc: Markus Armbruster Cc: qemu-stable@nongnu.org Signed-off-by: Paolo Bonzini 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