[libvirt PATCH v2 2/5] nodedev: Handle NULL command variable
In commit 68580a51, I removed the checks for NULL cmd variables because
virCommandRun() already handles the case where it is called with a NULL
cmd. Unfortunately, it handles this case by raising a generic error
which is both unhelpful and overwrites our existing error message. So
for example, when I attempt to create a mediated device with an invalid
parent, I get the following output:
virsh # nodedev-create mdev-test.xml
error: Failed to create node device from mdev-test.xml
error: internal error: invalid use of command API
With this patch, I now get a useful error message again:
virsh # nodedev-create mdev-test.xml
error: Failed to create node device from mdev-test.xml
error: internal error: unable to find parent device 'pci_0000_00_03_0'
Signed-off-by: Jonathon Jongsma <jjongsma(a)redhat.com>
---
src/node_device/node_device_driver.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/src/node_device/node_device_driver.c b/src/node_device/node_device_driver.c
index 0f13cb4849..43a8c1bf60 100644
--- a/src/node_device/node_device_driver.c
+++ b/src/node_device/node_device_driver.c
@@ -799,6 +799,10 @@ virMdevctlCreate(virNodeDeviceDef *def, char **uuid, char **errmsg)
MDEVCTL_CMD_CREATE,
uuid,
errmsg);
+
+ if (!cmd)
+ return -1;
+
/* an auto-generated uuid is returned via stdout if no uuid is specified in
* the mdevctl args */
if (virCommandRun(cmd, &status) < 0 || status != 0)
@@ -819,6 +823,9 @@ virMdevctlDefine(virNodeDeviceDef *def, char **uuid, char **errmsg)
MDEVCTL_CMD_DEFINE,
uuid, errmsg);
+ if (!cmd)
+ return -1;
+
/* an auto-generated uuid is returned via stdout if no uuid is specified in
* the mdevctl args */
if (virCommandRun(cmd, &status) < 0 || status != 0)
@@ -925,6 +932,9 @@ virMdevctlStop(virNodeDeviceDef *def, char **errmsg)
cmd = nodeDeviceGetMdevctlCommand(def, MDEVCTL_CMD_STOP, NULL, errmsg);
+ if (!cmd)
+ return -1;
+
if (virCommandRun(cmd, &status) < 0 || status != 0)
return -1;
@@ -940,6 +950,9 @@ virMdevctlUndefine(virNodeDeviceDef *def, char **errmsg)
cmd = nodeDeviceGetMdevctlCommand(def, MDEVCTL_CMD_UNDEFINE, NULL, errmsg);
+ if (!cmd)
+ return -1;
+
if (virCommandRun(cmd, &status) < 0 || status != 0)
return -1;
@@ -955,6 +968,9 @@ virMdevctlStart(virNodeDeviceDef *def, char **errmsg)
cmd = nodeDeviceGetMdevctlCommand(def, MDEVCTL_CMD_START, NULL, errmsg);
+ if (!cmd)
+ return -1;
+
if (virCommandRun(cmd, &status) < 0 || status != 0)
return -1;
--
2.31.1