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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::330; envelope-from=paolo.bonzini@gmail.com; helo=mail-wm1-x330.google.com X-Spam_score_int: -14 X-Spam_score: -1.5 X-Spam_bar: - X-Spam_report: (-1.5 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.248, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" This patch introduces a function that merges two keyval-produced (or keyval-like) QDicts. It can be used to emulate the behavior of .merge_lists =3D true QemuOpts groups, merging -readconfig sections and command-line options in a single QDict, and also to implement -set. Signed-off-by: Paolo Bonzini --- include/qemu/option.h | 1 + tests/unit/test-keyval.c | 56 ++++++++++++++++++++++++++++++++++++++++ util/keyval.c | 47 +++++++++++++++++++++++++++++++++ 3 files changed, 104 insertions(+) diff --git a/include/qemu/option.h b/include/qemu/option.h index f73e0dc7d9..d89c66145a 100644 --- a/include/qemu/option.h +++ b/include/qemu/option.h @@ -149,5 +149,6 @@ QemuOptsList *qemu_opts_append(QemuOptsList *dst, QemuO= ptsList *list); =20 QDict *keyval_parse(const char *params, const char *implied_key, bool *help, Error **errp); +void keyval_merge(QDict *old, const QDict *new, Error **errp); =20 #endif diff --git a/tests/unit/test-keyval.c b/tests/unit/test-keyval.c index e20c07cf3e..254b51e98c 100644 --- a/tests/unit/test-keyval.c +++ b/tests/unit/test-keyval.c @@ -747,6 +747,59 @@ static void test_keyval_visit_any(void) visit_free(v); } =20 +static void test_keyval_merge_success(void) +{ + QDict *old =3D keyval_parse("opt1=3Dabc,opt2.sub1=3Ddef,opt2.sub2=3Dgh= i,opt3=3Dxyz", + NULL, NULL, &error_abort); + QDict *new =3D keyval_parse("opt1=3DABC,opt2.sub2=3DGHI,opt2.sub3=3DJK= L", + NULL, NULL, &error_abort); + QDict *combined =3D keyval_parse("opt1=3DABC,opt2.sub1=3Ddef,opt2.sub2= =3DGHI,opt2.sub3=3DJKL,opt3=3Dxyz", + NULL, NULL, &error_abort); + Error *err =3D NULL; + + keyval_merge(old, new, &err); + g_assert(!err); + g_assert(qobject_is_equal(QOBJECT(combined), QOBJECT(old))); + qobject_unref(old); + qobject_unref(new); + qobject_unref(combined); +} + +static void test_keyval_merge_list(void) +{ + QDict *old =3D keyval_parse("opt1.0=3Dabc,opt2.0=3Dxyz", + NULL, NULL, &error_abort); + QDict *new =3D keyval_parse("opt1.0=3Ddef", + NULL, NULL, &error_abort); + QDict *combined =3D keyval_parse("opt1.0=3Dabc,opt1.1=3Ddef,opt2.0=3Dx= yz", + NULL, NULL, &error_abort); + Error *err =3D NULL; + + keyval_merge(old, new, &err); + g_assert(!err); + g_assert(qobject_is_equal(QOBJECT(combined), QOBJECT(old))); + qobject_unref(old); + qobject_unref(new); + qobject_unref(combined); +} + +static void test_keyval_merge_conflict(void) +{ + QDict *old =3D keyval_parse("opt2.sub1=3Ddef,opt2.sub2=3Dghi", + NULL, NULL, &error_abort); + QDict *new =3D keyval_parse("opt2=3DABC", + NULL, NULL, &error_abort); + Error *err =3D NULL; + + keyval_merge(new, old, &err); + error_free_or_abort(&err); + keyval_merge(old, new, &err); + error_free_or_abort(&err); + + qobject_unref(old); + qobject_unref(new); +} + int main(int argc, char *argv[]) { g_test_init(&argc, &argv, NULL); @@ -760,6 +813,9 @@ int main(int argc, char *argv[]) g_test_add_func("/keyval/visit/optional", test_keyval_visit_optional); g_test_add_func("/keyval/visit/alternate", test_keyval_visit_alternate= ); g_test_add_func("/keyval/visit/any", test_keyval_visit_any); + g_test_add_func("/keyval/merge/success", test_keyval_merge_success); + g_test_add_func("/keyval/merge/list", test_keyval_merge_list); + g_test_add_func("/keyval/merge/conflict", test_keyval_merge_conflict); g_test_run(); return 0; } diff --git a/util/keyval.c b/util/keyval.c index be34928813..0797f36e1d 100644 --- a/util/keyval.c +++ b/util/keyval.c @@ -310,6 +310,53 @@ static char *reassemble_key(GSList *key) return g_string_free(s, FALSE); } =20 +/* Merge two dictionaries. */ +static void keyval_do_merge(QDict *old, const QDict *new, GString *str, Er= ror **errp) +{ + size_t save_len =3D str->len; + const QDictEntry *ent; + QObject *old_value; + + for (ent =3D qdict_first(new); ent; ent =3D qdict_next(new, ent)) { + old_value =3D qdict_get(old, ent->key); + if (old_value) { + if (qobject_type(old_value) !=3D qobject_type(ent->value)) { + error_setg(errp, "Parameter '%s%s' used inconsistently", s= tr->str, ent->key); + return; + } else if (qobject_type(ent->value) =3D=3D QTYPE_QDICT) { + /* Merge sub-dictionaries. */ + g_string_append(str, ent->key); + g_string_append_c(str, '.'); + keyval_do_merge(qobject_to(QDict, old_value), + qobject_to(QDict, ent->value), + str, errp); + g_string_truncate(str, save_len); + continue; + } else if (qobject_type(ent->value) =3D=3D QTYPE_QLIST) { + /* Append to old list. */ + QList *old =3D qobject_to(QList, old_value); + QList *new =3D qobject_to(QList, ent->value); + const QListEntry *item; + QLIST_FOREACH_ENTRY(new, item) { + qobject_ref(item->value); + qlist_append_obj(old, item->value); + } + continue; + } + } + + qobject_ref(ent->value); + qdict_put_obj(old, ent->key, ent->value); + } +} + +void keyval_merge(QDict *old, const QDict *new, Error **errp) +{ + GString *str =3D g_string_new(""); + keyval_do_merge(old, new, str, errp); + g_string_free(str, TRUE); +} + /* * Listify @cur recursively. * Replace QDicts whose keys are all valid list indexes by QLists. --=20 2.31.1