[PATCH v2 3/5] qemu_passt: Make passt report errors to stderr whenever possible

Passt has '--stderr' argument which makes it report error onto stderr rather to system log. Unfortunately, it's currently impossible to use both '--log-file' and '--stderr', so pass the latter only if the former isn't passed. Then, use the stderr to produce more user friendly error message on failed start. Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- src/qemu/qemu_passt.c | 22 +++++++++++++++++++--- 1 file changed, 19 insertions(+), 3 deletions(-) diff --git a/src/qemu/qemu_passt.c b/src/qemu/qemu_passt.c index c082c149cd..881205449b 100644 --- a/src/qemu/qemu_passt.c +++ b/src/qemu/qemu_passt.c @@ -171,8 +171,13 @@ qemuPasstStart(virDomainObj *vm, if (net->sourceDev) virCommandAddArgList(cmd, "--interface", net->sourceDev, NULL); - if (net->backend.logFile) + if (net->backend.logFile) { virCommandAddArgList(cmd, "--log-file", net->backend.logFile, NULL); + } else { + /* By default, passt logs into system logger. But we are interested + * into errors too. Make it print errors onto stderr. */ + virCommandAddArg(cmd, "--stderr"); + } /* Add IP address info */ for (i = 0; i < net->guestIP.nips; i++) { @@ -265,8 +270,19 @@ qemuPasstStart(virDomainObj *vm, goto error; if (cmdret < 0 || exitstatus != 0) { - virReportError(VIR_ERR_INTERNAL_ERROR, - _("Could not start 'passt': %s"), NULLSTR(errbuf)); + if (STRNEQ_NULLABLE(errbuf, "")) { + virReportError(VIR_ERR_INTERNAL_ERROR, + _("Could not start 'passt': %s"), errbuf); + } else if (net->backend.logFile) { + virReportError(VIR_ERR_INTERNAL_ERROR, + _("Could not start 'passt': look into %s for error"), + net->backend.logFile); + } else { + virReportError(VIR_ERR_INTERNAL_ERROR, + _("Could not start 'passt': exit status = '%d'"), + exitstatus); + } + goto error; } -- 2.39.1