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nodedev: capture and report stderror from mdevctl

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When an mdevctl command fails, there is not much information available
to the user about why it failed. This is partly because we were not
making use of the error message that mdevctl itself prints upon failure.

Signed-off-by: Jonathon Jongsma <jjongsma@redhat.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
This commit is contained in:
Jonathon Jongsma 2021-02-23 14:24:14 -06:00
parent ffda44030a
commit ab1703191b
3 changed files with 37 additions and 21 deletions
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46
src/node_device/node_device_driver.c
View File

@ -700,7 +700,8 @@ nodeDeviceFindAddressByName(const char *name)
virCommandPtr
nodeDeviceGetMdevctlStartCommand(virNodeDeviceDefPtr def,
char **uuid_out)
char **uuid_out,
char **errmsg)
{
virCommandPtr cmd;
g_autofree char *json = NULL;
@ -725,15 +726,17 @@ nodeDeviceGetMdevctlStartCommand(virNodeDeviceDefPtr def,
virCommandSetInputBuffer(cmd, json);
virCommandSetOutputBuffer(cmd, uuid_out);
virCommandSetErrorBuffer(cmd, errmsg);
return cmd;
}
static int
virMdevctlStart(virNodeDeviceDefPtr def, char **uuid)
virMdevctlStart(virNodeDeviceDefPtr def, char **uuid, char **errmsg)
{
int status;
g_autoptr(virCommand) cmd = nodeDeviceGetMdevctlStartCommand(def, uuid);
g_autoptr(virCommand) cmd = nodeDeviceGetMdevctlStartCommand(def, uuid,
errmsg);
if (!cmd)
return -1;
@ -754,6 +757,7 @@ nodeDeviceCreateXMLMdev(virConnectPtr conn,
virNodeDeviceDefPtr def)
{
g_autofree char *uuid = NULL;
g_autofree char *errmsg = NULL;
if (!def->parent) {
virReportError(VIR_ERR_XML_ERROR, "%s",
@ -761,9 +765,11 @@ nodeDeviceCreateXMLMdev(virConnectPtr conn,
return NULL;
}
if (virMdevctlStart(def, &uuid) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Unable to start mediated device"));
if (virMdevctlStart(def, &uuid, &errmsg) < 0) {
if (errmsg)
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unable to start mediated device '%s': %s"),
def->name, errmsg);
return NULL;
}
@ -828,23 +834,25 @@ nodeDeviceCreateXML(virConnectPtr conn,
virCommandPtr
nodeDeviceGetMdevctlStopCommand(const char *uuid)
nodeDeviceGetMdevctlStopCommand(const char *uuid, char **errmsg)
{
return virCommandNewArgList(MDEVCTL,
"stop",
"-u",
uuid,
NULL);
virCommandPtr cmd = virCommandNewArgList(MDEVCTL,
"stop",
"-u",
uuid,
NULL);
virCommandSetErrorBuffer(cmd, errmsg);
return cmd;
}
static int
virMdevctlStop(virNodeDeviceDefPtr def)
virMdevctlStop(virNodeDeviceDefPtr def, char **errmsg)
{
int status;
g_autoptr(virCommand) cmd = NULL;
cmd = nodeDeviceGetMdevctlStopCommand(def->caps->data.mdev.uuid);
cmd = nodeDeviceGetMdevctlStopCommand(def->caps->data.mdev.uuid, errmsg);
if (virCommandRun(cmd, &status) < 0 || status != 0)
return -1;
@ -901,9 +909,13 @@ nodeDeviceDestroy(virNodeDevicePtr device)
ret = 0;
} else if (nodeDeviceHasCapability(def, VIR_NODE_DEV_CAP_MDEV)) {
if (virMdevctlStop(def) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Unable to stop mediated device"));
g_autofree char *errmsg = NULL;
if (virMdevctlStop(def, &errmsg) < 0) {
if (errmsg)
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unable to destroy '%s': %s"), def->name,
errmsg);
goto cleanup;
}
ret = 0;

6
src/node_device/node_device_driver.h
View File

@ -115,6 +115,8 @@ nodeConnectNodeDeviceEventDeregisterAny(virConnectPtr conn,
virCommandPtr
nodeDeviceGetMdevctlStartCommand(virNodeDeviceDefPtr def,
char **uuid_out);
char **uuid_out,
char **errmsg);
virCommandPtr
nodeDeviceGetMdevctlStopCommand(const char *uuid);
nodeDeviceGetMdevctlStopCommand(const char *uuid,
char **errmsg);

6
tests/nodedevmdevctltest.c
View File

@ -58,6 +58,7 @@ testMdevctlStart(const char *virt_type,
const char *actualCmdline = NULL;
int ret = -1;
g_autofree char *uuid = NULL;
g_autofree char *errmsg = NULL;
g_autofree char *stdinbuf = NULL;
g_autoptr(virCommand) cmd = NULL;
@ -66,7 +67,7 @@ testMdevctlStart(const char *virt_type,
/* this function will set a stdin buffer containing the json configuration
* of the device. The json value is captured in the callback above */
cmd = nodeDeviceGetMdevctlStartCommand(def, &uuid);
cmd = nodeDeviceGetMdevctlStartCommand(def, &uuid, &errmsg);
if (!cmd)
goto cleanup;
@ -117,11 +118,12 @@ testMdevctlStop(const void *data)
const char *actualCmdline = NULL;
int ret = -1;
g_autoptr(virCommand) cmd = NULL;
g_autofree char *errmsg = NULL;
g_autofree char *cmdlinefile =
g_strdup_printf("%s/nodedevmdevctldata/mdevctl-stop.argv",
abs_srcdir);
cmd = nodeDeviceGetMdevctlStopCommand(uuid);
cmd = nodeDeviceGetMdevctlStopCommand(uuid, &errmsg);
if (!cmd)
goto cleanup;