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virsh: Refactor error clearing on graceful fallback paths

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Virsh uses an error handler to save errors from libvirt. On some code
paths it's needed to clear libvirt errors and continue on fallback code
paths without reporting failure.

This patch adds function vshResetLibvirtError() that clears error
returned by libvirt and updates all places where the old two-line method
was used.
This commit is contained in:
Peter Krempa 2012-07-25 13:41:49 +02:00
parent 768007aedc
commit 3df9626c40
6 changed files with 34 additions and 48 deletions
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12
tools/virsh-domain-monitor.c
View File

@ -849,8 +849,7 @@ cmdDomblkstat(vshControl *ctl, const vshCmd *cmd)
if (last_error->code != VIR_ERR_NO_SUPPORT)
goto cleanup;
virFreeError(last_error);
last_error = NULL;
vshResetLibvirtError();
if (virDomainBlockStats(dom, device, &stats,
sizeof(stats)) == -1) {
@ -1166,8 +1165,7 @@ cmdDominfo(vshControl *ctl, const vshCmd *cmd)
virDomainFree(dom);
return false;
} else {
virFreeError(last_error);
last_error = NULL;
vshResetLibvirtError();
}
} else {
/* Only print something if a security model is active */
@ -1340,8 +1338,7 @@ vshDomainListCollect(vshControl *ctl, unsigned int flags)
/* check if the command is actually supported */
if (last_error && last_error->code == VIR_ERR_NO_SUPPORT) {
virFreeError(last_error);
last_error = NULL;
vshResetLibvirtError();
goto fallback;
}
@ -1350,8 +1347,7 @@ vshDomainListCollect(vshControl *ctl, unsigned int flags)
unsigned int newflags = flags & (VIR_CONNECT_LIST_DOMAINS_ACTIVE |
VIR_CONNECT_LIST_DOMAINS_INACTIVE);
virFreeError(last_error);
last_error = NULL;
vshResetLibvirtError();
if ((ret = virConnectListAllDomains(ctl->conn, &list->domains,
newflags)) >= 0) {
list->ndomains = ret;

36
tools/virsh-domain.c
View File

@ -2332,8 +2332,7 @@ cmdUndefine(vshControl *ctl, const vshCmd *cmd)
if (has_managed_save < 0) {
if (last_error->code != VIR_ERR_NO_SUPPORT)
goto error;
virFreeError(last_error);
last_error = NULL;
vshResetLibvirtError();
has_managed_save = 0;
}
@ -2341,8 +2340,7 @@ cmdUndefine(vshControl *ctl, const vshCmd *cmd)
if (has_snapshots < 0) {
if (last_error->code != VIR_ERR_NO_SUPPORT)
goto error;
virFreeError(last_error);
last_error = NULL;
vshResetLibvirtError();
has_snapshots = 0;
}
if (has_snapshots) {
@ -2351,8 +2349,7 @@ cmdUndefine(vshControl *ctl, const vshCmd *cmd)
if (has_snapshots_metadata < 0) {
/* The server did not know the new flag, assume that all
snapshots have metadata. */
virFreeError(last_error);
last_error = NULL;
vshResetLibvirtError();
has_snapshots_metadata = has_snapshots;
} else {
/* The server knew the new flag, all aspects of
@ -2461,8 +2458,7 @@ cmdUndefine(vshControl *ctl, const vshCmd *cmd)
vshPrint(ctl,
_("Storage volume '%s'(%s) is not managed by libvirt. "
"Remove it manually.\n"), target, source);
virFreeError(last_error);
last_error = NULL;
vshResetLibvirtError();
continue;
}
vlist[nvols].source = source;
@ -2497,8 +2493,7 @@ cmdUndefine(vshControl *ctl, const vshCmd *cmd)
if (rc == 0 || (last_error->code != VIR_ERR_NO_SUPPORT &&
last_error->code != VIR_ERR_INVALID_ARG))
goto out;
virFreeError(last_error);
last_error = NULL;
vshResetLibvirtError();
}
/* The new API is unsupported or unsafe; fall back to doing things
@ -2657,13 +2652,11 @@ cmdStart(vshControl *ctl, const vshCmd *cmd)
virshReportError(ctl);
goto cleanup;
}
virFreeError(last_error);
last_error = NULL;
vshResetLibvirtError();
rc = virDomainHasManagedSaveImage(dom, 0);
if (rc < 0) {
/* No managed save image to remove */
virFreeError(last_error);
last_error = NULL;
vshResetLibvirtError();
} else if (rc > 0) {
if (virDomainManagedSaveRemove(dom, 0) < 0) {
virshReportError(ctl);
@ -4173,8 +4166,7 @@ cmdVcpucount(vshControl *ctl, const vshCmd *cmd)
if (!tmp || virStrToLong_i(tmp + 1, &tmp, 10, &count) < 0)
count = -1;
}
virFreeError(last_error);
last_error = NULL;
vshResetLibvirtError();
VIR_FREE(xml);
}
@ -4187,8 +4179,7 @@ cmdVcpucount(vshControl *ctl, const vshCmd *cmd)
} else {
vshPrint(ctl, "%d\n", count);
}
virFreeError(last_error);
last_error = NULL;
vshResetLibvirtError();
}
if (all || (maximum && live)) {
@ -4208,8 +4199,7 @@ cmdVcpucount(vshControl *ctl, const vshCmd *cmd)
} else {
vshPrint(ctl, "%d\n", count);
}
virFreeError(last_error);
last_error = NULL;
vshResetLibvirtError();
}
if (all || (active && config)) {
@ -4245,8 +4235,7 @@ cmdVcpucount(vshControl *ctl, const vshCmd *cmd)
} else {
vshPrint(ctl, "%d\n", count);
}
virFreeError(last_error);
last_error = NULL;
vshResetLibvirtError();
}
if (all || (active && live)) {
@ -4267,8 +4256,7 @@ cmdVcpucount(vshControl *ctl, const vshCmd *cmd)
} else {
vshPrint(ctl, "%d\n", count);
}
virFreeError(last_error);
last_error = NULL;
vshResetLibvirtError();
}
virDomainFree(dom);

3
tools/virsh-network.c
View File

@ -639,8 +639,7 @@ static char *vshNetworkGetXMLDesc(virNetworkPtr network)
/* The server side libvirt doesn't support
* VIR_NETWORK_XML_INACTIVE, so retry without it.
*/
virFreeError(last_error);
last_error = NULL;
vshResetLibvirtError();
flags &= ~VIR_NETWORK_XML_INACTIVE;
doc = virNetworkGetXMLDesc(network, flags);
}

3
tools/virsh-pool.c
View File

@ -1379,8 +1379,7 @@ cmdPoolEdit(vshControl *ctl, const vshCmd *cmd)
if (!(tmp_desc = virStoragePoolGetXMLDesc(pool, flags))) {
if (last_error->code == VIR_ERR_INVALID_ARG) {
flags &= ~VIR_STORAGE_XML_INACTIVE;
virFreeError(last_error);
last_error = NULL;
vshResetLibvirtError();
} else {
goto cleanup;
}

15
tools/virsh-snapshot.c
View File

@ -43,8 +43,7 @@ vshSnapshotCreate(vshControl *ctl, virDomainPtr dom, const char *buffer,
(flags & VIR_DOMAIN_SNAPSHOT_CREATE_HALT)) {
int persistent;
virFreeError(last_error);
last_error = NULL;
vshResetLibvirtError();
persistent = virDomainIsPersistent(dom);
if (persistent < 0) {
virshReportError(ctl);
@ -644,8 +643,7 @@ cleanup:
virshReportError(ctl);
vshError(ctl, "%s", _("unable to determine if snapshot has parent"));
} else {
virFreeError(last_error);
last_error = NULL;
vshResetLibvirtError();
}
if (parent)
virDomainSnapshotFree(parent);
@ -932,8 +930,7 @@ vshSnapshotListCollect(vshControl *ctl, virDomainPtr dom,
last_error->code == VIR_ERR_NO_SUPPORT)) {
/* We can emulate --from. */
/* XXX can we also emulate --leaves? */
virFreeError(last_error);
last_error = NULL;
vshResetLibvirtError();
ctl->useSnapshotOld = true;
flags &= ~VIR_DOMAIN_SNAPSHOT_LIST_DESCENDANTS;
goto global;
@ -950,8 +947,7 @@ vshSnapshotListCollect(vshControl *ctl, virDomainPtr dom,
/* XXX can we also emulate --leaves? */
if (!from && count < 0 && last_error->code == VIR_ERR_INVALID_ARG &&
(flags & VIR_DOMAIN_SNAPSHOT_LIST_ROOTS)) {
virFreeError(last_error);
last_error = NULL;
vshResetLibvirtError();
roots = true;
flags &= ~VIR_DOMAIN_SNAPSHOT_LIST_ROOTS;
count = virDomainSnapshotNum(dom, flags);
@ -1514,8 +1510,7 @@ cmdDomainSnapshotRevert(vshControl *ctl, const vshCmd *cmd)
if (result < 0 && force &&
last_error->code == VIR_ERR_SNAPSHOT_REVERT_RISKY) {
flags |= VIR_DOMAIN_SNAPSHOT_REVERT_FORCE;
virFreeError(last_error);
last_error = NULL;
vshResetLibvirtError();
result = virDomainRevertToSnapshot(snapshot, flags);
}
if (result < 0)

13
tools/virsh.c
View File

@ -491,6 +491,16 @@ virshErrorHandler(void *unused ATTRIBUTE_UNUSED, virErrorPtr error)
virDefaultErrorFunc(error);
}
/*
* Reset libvirt error on graceful fallback paths
*/
static void
vshResetLibvirtError(void)
{
virFreeError(last_error);
last_error = NULL;
}
/*
* Report an error when a command finishes. This is better than before
* (when correct operation would report errors), but it has some
@ -521,8 +531,7 @@ virshReportError(vshControl *ctl)
vshError(ctl, "%s", last_error->message);
out:
virFreeError(last_error);
last_error = NULL;
vshResetLibvirtError();
}
static volatile sig_atomic_t intCaught = 0;