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authorMarkus Armbruster <armbru@redhat.com>2017-03-03 13:32:22 +0100
committerMarkus Armbruster <armbru@redhat.com>2017-03-05 09:02:10 +0100
commit13420ef837a217afd9f1bd4728667e1ea50d5916 (patch)
treed888b834f29e4d9ca15ce415ea7ce7aaec8107fd /tests
parent74d8c9d99d1984d78ac8d8e28266525b2b190b8b (diff)
libqtest: Work around a "QMP wants a newline" bug
The next commit is going to add a test that calls qmp("null"). Curiously, this hangs. Here's why. qmp_fd_sendv() doesn't send newlines. Not even when @fmt contains some. At first glance, the QMP parser seems to be fine with that. However, it turns out that it fails to react to input until it sees either a newline, an object or an array. To reproduce, feed to a QMP monitor like this: $ echo -n 'null' | socat UNIX:/work/armbru/images/test-qmp STDIO {"QMP": {"version": {"qemu": {"micro": 50, "minor": 8, "major": 2}, "package": " (v2.8.0-1195-gf84141e-dirty)"}, "capabilities": []}} No output after the greeting. Add a newline: $ echo 'null' | socat UNIX:/work/armbru/images/test-qmp STDIO {"QMP": {"version": {"qemu": {"micro": 50, "minor": 8, "major": 2}, "package": " (v2.8.0-1195-gf84141e-dirty)"}, "capabilities": []}} {"error": {"class": "GenericError", "desc": "Expected 'object' in QMP input"}} Correct output for input 'null'. Add an object instead: $ echo -n 'null { "execute": "qmp_capabilities" }' | socat UNIX:qmp-socket STDIO {"QMP": {"version": {"qemu": {"micro": 50, "minor": 8, "major": 2}, "package": " (v2.8.0-1195-gf84141e-dirty)"}, "capabilities": []}} {"error": {"class": "GenericError", "desc": "Expected 'object' in QMP input"}} {"return": {}} Also correct output. Work around this QMP bug by having qmp_fd_sendv() append a newline. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <1488544368-30622-3-git-send-email-armbru@redhat.com>
Diffstat (limited to 'tests')
-rw-r--r--tests/libqtest.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/tests/libqtest.c b/tests/libqtest.c
index 3a0e0d63a7..951a3b4bf6 100644
--- a/tests/libqtest.c
+++ b/tests/libqtest.c
@@ -442,14 +442,20 @@ void qmp_fd_sendv(int fd, const char *fmt, va_list ap)
if (qobj) {
int log = getenv("QTEST_LOG") != NULL;
QString *qstr = qobject_to_json(qobj);
- const char *str = qstring_get_str(qstr);
- size_t size = qstring_get_length(qstr);
+ const char *str;
+
+ /*
+ * BUG: QMP doesn't react to input until it sees a newline, an
+ * object, or an array. Work-around: give it a newline.
+ */
+ qstring_append_chr(qstr, '\n');
+ str = qstring_get_str(qstr);
if (log) {
fprintf(stderr, "%s", str);
}
/* Send QMP request */
- socket_send(fd, str, size);
+ socket_send(fd, str, qstring_get_length(qstr));
QDECREF(qstr);
qobject_decref(qobj);