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snapshot: expose location through virsh snapshot-info

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Now that we can filter on this information, we should also make
it easy to get at.

* tools/virsh-snapshot.c (cmdSnapshotInfo): Add another output
row, and switch to XPath queries rather than strstr.
This commit is contained in:
Eric Blake 2012-11-13 10:40:28 -07:00
parent 62711817db
commit 0f9b6ee42d
1 changed files with 49 additions and 8 deletions
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57
tools/virsh-snapshot.c
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@ -793,7 +793,10 @@ cmdSnapshotInfo(vshControl *ctl, const vshCmd *cmd)
virDomainSnapshotPtr snapshot = NULL;
const char *name;
char *doc = NULL;
char *tmp;
xmlDocPtr xmldoc = NULL;
xmlXPathContextPtr ctxt = NULL;
char *state = NULL;
int external;
char *parent = NULL;
bool ret = false;
int count;
@ -835,18 +838,48 @@ cmdSnapshotInfo(vshControl *ctl, const vshCmd *cmd)
if (!doc)
goto cleanup;
tmp = strstr(doc, "<state>");
if (!tmp) {
xmldoc = virXMLParseStringCtxt(doc, _("(domain_snapshot)"), &ctxt);
if (!xmldoc)
goto cleanup;
state = virXPathString("string(/domainsnapshot/state)", ctxt);
if (!state) {
vshError(ctl, "%s",
_("unexpected problem reading snapshot xml"));
goto cleanup;
}
tmp += strlen("<state>");
vshPrint(ctl, "%-15s %.*s\n", _("State:"),
(int) (strchr(tmp, '<') - tmp), tmp);
vshPrint(ctl, "%-15s %s\n", _("State:"), state);
if (vshGetSnapshotParent(ctl, snapshot, &parent) < 0)
/* In addition to state, location is useful. If the snapshot has
* a <memory> element, then the existence of snapshot='external'
* prior to <domain> is the deciding factor; for snapshots
* created prior to 1.0.1, a state of disk-only is the only
* external snapshot. */
switch (virXPathBoolean("boolean(/domainsnapshot/memory)", ctxt)) {
case 1:
external = virXPathBoolean("boolean(/domainsnapshot/memory/@snapshot=external "
"| /domainsnapshot/disks/disk/@snapshot=external)",
ctxt);
break;
case 0:
external = STREQ(state, "disk-snapshot");
break;
default:
external = -1;
break;
}
if (external < 0) {
vshError(ctl, "%s",
_("unexpected problem reading snapshot xml"));
goto cleanup;
}
vshPrint(ctl, "%-15s %s\n", _("Location:"),
external ? _("external") : _("internal"));
/* Since we already have the XML, there's no need to call
* virDomainSnapshotGetParent */
parent = virXPathString("string(/domainsnapshot/parent/name)", ctxt);
vshPrint(ctl, "%-15s %s\n", _("Parent:"), parent ? parent : "-");
/* Children, Descendants. After this point, the fallback to
@ -858,8 +891,13 @@ cmdSnapshotInfo(vshControl *ctl, const vshCmd *cmd)
}
flags = 0;
count = virDomainSnapshotNumChildren(snapshot, flags);
if (count < 0)
if (count < 0) {
if (last_error->code == VIR_ERR_NO_SUPPORT) {
vshResetLibvirtError();
ret = true;
}
goto cleanup;
}
vshPrint(ctl, "%-15s %d\n", _("Children:"), count);
flags = VIR_DOMAIN_SNAPSHOT_LIST_DESCENDANTS;
count = virDomainSnapshotNumChildren(snapshot, flags);
@ -882,6 +920,9 @@ cmdSnapshotInfo(vshControl *ctl, const vshCmd *cmd)
ret = true;
cleanup:
VIR_FREE(state);
xmlXPathFreeContext(ctxt);
xmlFreeDoc(xmldoc);
VIR_FREE(doc);
VIR_FREE(parent);
if (snapshot)