Schema parsing was failing with errors such as: libguestfs: QMP parse error: '[' or '{' expected near end of file (ignored) This happened because the QMP command was actually completely failing and never printing a result at all. This happens because the qemu audio driver can't be set up without a console. We can suppress this by setting the environment variable QEMU_AUDIO_DRV=none, which is the same thing that libvirt does, and also the same thing that we are already doing when launching the real appliance subprocess. See also: https://bugzilla.redhat.com/show_bug.cgi?id=1692047 --- lib/qemu.c | 1 + 1 file changed, 1 insertion(+) diff --git a/lib/qemu.c b/lib/qemu.c index 10bb83105..2f3493217 100644 --- a/lib/qemu.c +++ b/lib/qemu.c @@ -566,6 +566,7 @@ generic_qmp_test (guestfs_h *g, struct qemu_data *data, /* Exit QEMU after sending the commands. */ guestfs_int_cmd_add_string_unquoted (cmd, "'{ \"execute\": \"quit\" }' "); guestfs_int_cmd_add_string_unquoted (cmd, " | "); + guestfs_int_cmd_add_string_unquoted (cmd, "QEMU_AUDIO_DRV=none "); guestfs_int_cmd_add_string_quoted (cmd, g->hv); guestfs_int_cmd_add_string_unquoted (cmd, " -display none"); guestfs_int_cmd_add_string_unquoted (cmd, " -machine "); -- 2.21.0