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libvirt/tools/virsh-snapshot.c
Peter Krempa 2751ab289b virsh: Fix error resetting on fallback paths 
On some fallback paths in virsh, error reported by the previously failed
API is cleared by virResetLastError() that doesn't free error stored by
virsh. This patch changes this to clear it using vshResetLibvirtError().
2012-07-27 10:34:58 +02:00

1624 lines
52 KiB
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/*
* virsh-domain.c: Commands to manage domain snapshot
*
* Copyright (C) 2005, 2007-2012 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; If not, see
* <http://www.gnu.org/licenses/>.
*
* Daniel Veillard <veillard@redhat.com>
* Karel Zak <kzak@redhat.com>
* Daniel P. Berrange <berrange@redhat.com>
*
*/
/* Helper for snapshot-create and snapshot-create-as */
static bool
vshSnapshotCreate(vshControl *ctl, virDomainPtr dom, const char *buffer,
unsigned int flags, const char *from)
{
bool ret = false;
virDomainSnapshotPtr snapshot;
bool halt = false;
char *doc = NULL;
xmlDocPtr xml = NULL;
xmlXPathContextPtr ctxt = NULL;
const char *name = NULL;
snapshot = virDomainSnapshotCreateXML(dom, buffer, flags);
/* Emulate --halt on older servers. */
if (!snapshot && last_error->code == VIR_ERR_INVALID_ARG &&
(flags & VIR_DOMAIN_SNAPSHOT_CREATE_HALT)) {
int persistent;
vshResetLibvirtError();
persistent = virDomainIsPersistent(dom);
if (persistent < 0) {
virshReportError(ctl);
goto cleanup;
}
if (!persistent) {
vshError(ctl, "%s",
_("cannot halt after snapshot of transient domain"));
goto cleanup;
}
if (virDomainIsActive(dom) == 1)
halt = true;
flags &= ~VIR_DOMAIN_SNAPSHOT_CREATE_HALT;
snapshot = virDomainSnapshotCreateXML(dom, buffer, flags);
}
if (snapshot == NULL)
goto cleanup;
if (halt && virDomainDestroy(dom) < 0) {
virshReportError(ctl);
goto cleanup;
}
name = virDomainSnapshotGetName(snapshot);
if (!name) {
vshError(ctl, "%s", _("Could not get snapshot name"));
goto cleanup;
}
if (from)
vshPrint(ctl, _("Domain snapshot %s created from '%s'"), name, from);
else
vshPrint(ctl, _("Domain snapshot %s created"), name);
ret = true;
cleanup:
xmlXPathFreeContext(ctxt);
xmlFreeDoc(xml);
if (snapshot)
virDomainSnapshotFree(snapshot);
VIR_FREE(doc);
return ret;
}
/*
* "snapshot-create" command
*/
static const vshCmdInfo info_snapshot_create[] = {
{"help", N_("Create a snapshot from XML")},
{"desc", N_("Create a snapshot (disk and RAM) from XML")},
{NULL, NULL}
};
static const vshCmdOptDef opts_snapshot_create[] = {
{"domain", VSH_OT_DATA, VSH_OFLAG_REQ, N_("domain name, id or uuid")},
{"xmlfile", VSH_OT_DATA, 0, N_("domain snapshot XML")},
{"redefine", VSH_OT_BOOL, 0, N_("redefine metadata for existing snapshot")},
{"current", VSH_OT_BOOL, 0, N_("with redefine, set current snapshot")},
{"no-metadata", VSH_OT_BOOL, 0, N_("take snapshot but create no metadata")},
{"halt", VSH_OT_BOOL, 0, N_("halt domain after snapshot is created")},
{"disk-only", VSH_OT_BOOL, 0, N_("capture disk state but not vm state")},
{"reuse-external", VSH_OT_BOOL, 0, N_("reuse any existing external files")},
{"quiesce", VSH_OT_BOOL, 0, N_("quiesce guest's file systems")},
{"atomic", VSH_OT_BOOL, 0, N_("require atomic operation")},
{NULL, 0, 0, NULL}
};
static bool
cmdSnapshotCreate(vshControl *ctl, const vshCmd *cmd)
{
virDomainPtr dom = NULL;
bool ret = false;
const char *from = NULL;
char *buffer = NULL;
unsigned int flags = 0;
if (vshCommandOptBool(cmd, "redefine"))
flags |= VIR_DOMAIN_SNAPSHOT_CREATE_REDEFINE;
if (vshCommandOptBool(cmd, "current"))
flags |= VIR_DOMAIN_SNAPSHOT_CREATE_CURRENT;
if (vshCommandOptBool(cmd, "no-metadata"))
flags |= VIR_DOMAIN_SNAPSHOT_CREATE_NO_METADATA;
if (vshCommandOptBool(cmd, "halt"))
flags |= VIR_DOMAIN_SNAPSHOT_CREATE_HALT;
if (vshCommandOptBool(cmd, "disk-only"))
flags |= VIR_DOMAIN_SNAPSHOT_CREATE_DISK_ONLY;
if (vshCommandOptBool(cmd, "reuse-external"))
flags |= VIR_DOMAIN_SNAPSHOT_CREATE_REUSE_EXT;
if (vshCommandOptBool(cmd, "quiesce"))
flags |= VIR_DOMAIN_SNAPSHOT_CREATE_QUIESCE;
if (vshCommandOptBool(cmd, "atomic"))
flags |= VIR_DOMAIN_SNAPSHOT_CREATE_ATOMIC;
if (!vshConnectionUsability(ctl, ctl->conn))
goto cleanup;
dom = vshCommandOptDomain(ctl, cmd, NULL);
if (dom == NULL)
goto cleanup;
if (vshCommandOptString(cmd, "xmlfile", &from) <= 0)
buffer = vshStrdup(ctl, "<domainsnapshot/>");
else {
if (virFileReadAll(from, VIRSH_MAX_XML_FILE, &buffer) < 0) {
/* we have to report the error here because during cleanup
* we'll run through virDomainFree(), which loses the
* last error
*/
virshReportError(ctl);
goto cleanup;
}
}
if (buffer == NULL) {
vshError(ctl, "%s", _("Out of memory"));
goto cleanup;
}
ret = vshSnapshotCreate(ctl, dom, buffer, flags, from);
cleanup:
VIR_FREE(buffer);
if (dom)
virDomainFree(dom);
return ret;
}
/*
* "snapshot-create-as" command
*/
static int
vshParseSnapshotDiskspec(vshControl *ctl, virBufferPtr buf, const char *str)
{
int ret = -1;
char *name = NULL;
char *snapshot = NULL;
char *driver = NULL;
char *file = NULL;
char *spec = vshStrdup(ctl, str);
char *tmp = spec;
size_t len = strlen(str);
if (*str == ',')
goto cleanup;
name = tmp;
while ((tmp = strchr(tmp, ','))) {
if (tmp[1] == ',') {
/* Recognize ,, as an escape for a literal comma */
memmove(&tmp[1], &tmp[2], len - (tmp - spec) - 2 + 1);
len--;
tmp++;
continue;
}
/* Terminate previous string, look for next recognized one */
*tmp++ = '\0';
if (!snapshot && STRPREFIX(tmp, "snapshot="))
snapshot = tmp + strlen("snapshot=");
else if (!driver && STRPREFIX(tmp, "driver="))
driver = tmp + strlen("driver=");
else if (!file && STRPREFIX(tmp, "file="))
file = tmp + strlen("file=");
else
goto cleanup;
}
virBufferEscapeString(buf, " <disk name='%s'", name);
if (snapshot)
virBufferAsprintf(buf, " snapshot='%s'", snapshot);
if (driver || file) {
virBufferAddLit(buf, ">\n");
if (driver)
virBufferAsprintf(buf, " <driver type='%s'/>\n", driver);
if (file)
virBufferEscapeString(buf, " <source file='%s'/>\n", file);
virBufferAddLit(buf, " </disk>\n");
} else {
virBufferAddLit(buf, "/>\n");
}
ret = 0;
cleanup:
if (ret < 0)
vshError(ctl, _("unable to parse diskspec: %s"), str);
VIR_FREE(spec);
return ret;
}
static const vshCmdInfo info_snapshot_create_as[] = {
{"help", N_("Create a snapshot from a set of args")},
{"desc", N_("Create a snapshot (disk and RAM) from arguments")},
{NULL, NULL}
};
static const vshCmdOptDef opts_snapshot_create_as[] = {
{"domain", VSH_OT_DATA, VSH_OFLAG_REQ, N_("domain name, id or uuid")},
{"name", VSH_OT_DATA, 0, N_("name of snapshot")},
{"description", VSH_OT_DATA, 0, N_("description of snapshot")},
{"print-xml", VSH_OT_BOOL, 0, N_("print XML document rather than create")},
{"no-metadata", VSH_OT_BOOL, 0, N_("take snapshot but create no metadata")},
{"halt", VSH_OT_BOOL, 0, N_("halt domain after snapshot is created")},
{"disk-only", VSH_OT_BOOL, 0, N_("capture disk state but not vm state")},
{"reuse-external", VSH_OT_BOOL, 0, N_("reuse any existing external files")},
{"quiesce", VSH_OT_BOOL, 0, N_("quiesce guest's file systems")},
{"atomic", VSH_OT_BOOL, 0, N_("require atomic operation")},
{"diskspec", VSH_OT_ARGV, 0,
N_("disk attributes: disk[,snapshot=type][,driver=type][,file=name]")},
{NULL, 0, 0, NULL}
};
static bool
cmdSnapshotCreateAs(vshControl *ctl, const vshCmd *cmd)
{
virDomainPtr dom = NULL;
bool ret = false;
char *buffer = NULL;
const char *name = NULL;
const char *desc = NULL;
virBuffer buf = VIR_BUFFER_INITIALIZER;
unsigned int flags = 0;
const vshCmdOpt *opt = NULL;
if (vshCommandOptBool(cmd, "no-metadata"))
flags |= VIR_DOMAIN_SNAPSHOT_CREATE_NO_METADATA;
if (vshCommandOptBool(cmd, "halt"))
flags |= VIR_DOMAIN_SNAPSHOT_CREATE_HALT;
if (vshCommandOptBool(cmd, "disk-only"))
flags |= VIR_DOMAIN_SNAPSHOT_CREATE_DISK_ONLY;
if (vshCommandOptBool(cmd, "reuse-external"))
flags |= VIR_DOMAIN_SNAPSHOT_CREATE_REUSE_EXT;
if (vshCommandOptBool(cmd, "quiesce"))
flags |= VIR_DOMAIN_SNAPSHOT_CREATE_QUIESCE;
if (vshCommandOptBool(cmd, "atomic"))
flags |= VIR_DOMAIN_SNAPSHOT_CREATE_ATOMIC;
if (!vshConnectionUsability(ctl, ctl->conn))
goto cleanup;
dom = vshCommandOptDomain(ctl, cmd, NULL);
if (dom == NULL)
goto cleanup;
if (vshCommandOptString(cmd, "name", &name) < 0 ||
vshCommandOptString(cmd, "description", &desc) < 0) {
vshError(ctl, _("argument must not be empty"));
goto cleanup;
}
virBufferAddLit(&buf, "<domainsnapshot>\n");
if (name)
virBufferEscapeString(&buf, " <name>%s</name>\n", name);
if (desc)
virBufferEscapeString(&buf, " <description>%s</description>\n", desc);
if (vshCommandOptBool(cmd, "diskspec")) {
virBufferAddLit(&buf, " <disks>\n");
while ((opt = vshCommandOptArgv(cmd, opt))) {
if (vshParseSnapshotDiskspec(ctl, &buf, opt->data) < 0) {
virBufferFreeAndReset(&buf);
goto cleanup;
}
}
virBufferAddLit(&buf, " </disks>\n");
}
virBufferAddLit(&buf, "</domainsnapshot>\n");
buffer = virBufferContentAndReset(&buf);
if (buffer == NULL) {
vshError(ctl, "%s", _("Out of memory"));
goto cleanup;
}
if (vshCommandOptBool(cmd, "print-xml")) {
vshPrint(ctl, "%s\n", buffer);
ret = true;
goto cleanup;
}
ret = vshSnapshotCreate(ctl, dom, buffer, flags, NULL);
cleanup:
VIR_FREE(buffer);
if (dom)
virDomainFree(dom);
return ret;
}
/* Helper for resolving {--current | --ARG name} into a snapshot
* belonging to DOM. If EXCLUSIVE, fail if both --current and arg are
* present. On success, populate *SNAP and *NAME, before returning 0.
* On failure, return -1 after issuing an error message. */
static int
vshLookupSnapshot(vshControl *ctl, const vshCmd *cmd,
const char *arg, bool exclusive, virDomainPtr dom,
virDomainSnapshotPtr *snap, const char **name)
{
bool current = vshCommandOptBool(cmd, "current");
const char *snapname = NULL;
if (vshCommandOptString(cmd, arg, &snapname) < 0) {
vshError(ctl, _("invalid argument for --%s"), arg);
return -1;
}
if (exclusive && current && snapname) {
vshError(ctl, _("--%s and --current are mutually exclusive"), arg);
return -1;
}
if (snapname) {
*snap = virDomainSnapshotLookupByName(dom, snapname, 0);
} else if (current) {
*snap = virDomainSnapshotCurrent(dom, 0);
} else {
vshError(ctl, _("--%s or --current is required"), arg);
return -1;
}
if (!*snap) {
virshReportError(ctl);
return -1;
}
*name = virDomainSnapshotGetName(*snap);
return 0;
}
/*
* "snapshot-edit" command
*/
static const vshCmdInfo info_snapshot_edit[] = {
{"help", N_("edit XML for a snapshot")},
{"desc", N_("Edit the domain snapshot XML for a named snapshot")},
{NULL, NULL}
};
static const vshCmdOptDef opts_snapshot_edit[] = {
{"domain", VSH_OT_DATA, VSH_OFLAG_REQ, N_("domain name, id or uuid")},
{"snapshotname", VSH_OT_DATA, 0, N_("snapshot name")},
{"current", VSH_OT_BOOL, 0, N_("also set edited snapshot as current")},
{"rename", VSH_OT_BOOL, 0, N_("allow renaming an existing snapshot")},
{"clone", VSH_OT_BOOL, 0, N_("allow cloning to new name")},
{NULL, 0, 0, NULL}
};
static bool
cmdSnapshotEdit(vshControl *ctl, const vshCmd *cmd)
{
virDomainPtr dom = NULL;
virDomainSnapshotPtr snapshot = NULL;
virDomainSnapshotPtr edited = NULL;
const char *name;
const char *edited_name;
bool ret = false;
unsigned int getxml_flags = VIR_DOMAIN_XML_SECURE;
unsigned int define_flags = VIR_DOMAIN_SNAPSHOT_CREATE_REDEFINE;
bool rename_okay = vshCommandOptBool(cmd, "rename");
bool clone_okay = vshCommandOptBool(cmd, "clone");
if (rename_okay && clone_okay) {
vshError(ctl, "%s",
_("--rename and --clone are mutually exclusive"));
return false;
}
if (vshCommandOptBool(cmd, "current") &&
vshCommandOptBool(cmd, "snapshotname"))
define_flags |= VIR_DOMAIN_SNAPSHOT_CREATE_CURRENT;
if (!vshConnectionUsability(ctl, ctl->conn))
return false;
dom = vshCommandOptDomain(ctl, cmd, NULL);
if (dom == NULL)
goto cleanup;
if (vshLookupSnapshot(ctl, cmd, "snapshotname", false, dom,
&snapshot, &name) < 0)
goto cleanup;
#define EDIT_GET_XML \
virDomainSnapshotGetXMLDesc(snapshot, getxml_flags)
#define EDIT_NOT_CHANGED \
/* Depending on flags, we re-edit even if XML is unchanged. */ \
if (!(define_flags & VIR_DOMAIN_SNAPSHOT_CREATE_CURRENT)) { \
vshPrint(ctl, \
_("Snapshot %s XML configuration not changed.\n"), \
name); \
ret = true; \
goto cleanup; \
}
#define EDIT_DEFINE \
(strstr(doc, "<state>disk-snapshot</state>") ? \
define_flags |= VIR_DOMAIN_SNAPSHOT_CREATE_DISK_ONLY : 0), \
edited = virDomainSnapshotCreateXML(dom, doc_edited, define_flags)
#define EDIT_FREE \
if (edited) \
virDomainSnapshotFree(edited);
#include "virsh-edit.c"
edited_name = virDomainSnapshotGetName(edited);
if (STREQ(name, edited_name)) {
vshPrint(ctl, _("Snapshot %s edited.\n"), name);
} else if (clone_okay) {
vshPrint(ctl, _("Snapshot %s cloned to %s.\n"), name,
edited_name);
} else {
unsigned int delete_flags;
delete_flags = VIR_DOMAIN_SNAPSHOT_DELETE_METADATA_ONLY;
if (virDomainSnapshotDelete(rename_okay ? snapshot : edited,
delete_flags) < 0) {
virshReportError(ctl);
vshError(ctl, _("Failed to clean up %s"),
rename_okay ? name : edited_name);
goto cleanup;
}
if (!rename_okay) {
vshError(ctl, _("Must use --rename or --clone to change %s to %s"),
name, edited_name);
goto cleanup;
}
}
ret = true;
cleanup:
if (edited)
virDomainSnapshotFree(edited);
else
vshError(ctl, _("Failed to update %s"), name);
if (snapshot)
virDomainSnapshotFree(snapshot);
if (dom)
virDomainFree(dom);
return ret;
}
/*
* "snapshot-current" command
*/
static const vshCmdInfo info_snapshot_current[] = {
{"help", N_("Get or set the current snapshot")},
{"desc", N_("Get or set the current snapshot")},
{NULL, NULL}
};
static const vshCmdOptDef opts_snapshot_current[] = {
{"domain", VSH_OT_DATA, VSH_OFLAG_REQ, N_("domain name, id or uuid")},
{"name", VSH_OT_BOOL, 0, N_("list the name, rather than the full xml")},
{"security-info", VSH_OT_BOOL, 0,
N_("include security sensitive information in XML dump")},
{"snapshotname", VSH_OT_DATA, 0,
N_("name of existing snapshot to make current")},
{NULL, 0, 0, NULL}
};
static bool
cmdSnapshotCurrent(vshControl *ctl, const vshCmd *cmd)
{
virDomainPtr dom = NULL;
bool ret = false;
int current;
virDomainSnapshotPtr snapshot = NULL;
char *xml = NULL;
const char *snapshotname = NULL;
unsigned int flags = 0;
const char *domname;
if (vshCommandOptBool(cmd, "security-info"))
flags |= VIR_DOMAIN_XML_SECURE;
if (!vshConnectionUsability(ctl, ctl->conn))
goto cleanup;
dom = vshCommandOptDomain(ctl, cmd, &domname);
if (dom == NULL)
goto cleanup;
if (vshCommandOptString(cmd, "snapshotname", &snapshotname) < 0) {
vshError(ctl, _("invalid snapshotname argument '%s'"), snapshotname);
goto cleanup;
}
if (snapshotname) {
virDomainSnapshotPtr snapshot2 = NULL;
flags = (VIR_DOMAIN_SNAPSHOT_CREATE_REDEFINE |
VIR_DOMAIN_SNAPSHOT_CREATE_CURRENT);
if (vshCommandOptBool(cmd, "name")) {
vshError(ctl, "%s",
_("--name and snapshotname are mutually exclusive"));
goto cleanup;
}
snapshot = virDomainSnapshotLookupByName(dom, snapshotname, 0);
if (snapshot == NULL)
goto cleanup;
xml = virDomainSnapshotGetXMLDesc(snapshot, VIR_DOMAIN_XML_SECURE);
if (!xml)
goto cleanup;
/* strstr is safe here, since xml came from libvirt API and not user */
if (strstr(xml, "<state>disk-snapshot</state>"))
flags |= VIR_DOMAIN_SNAPSHOT_CREATE_DISK_ONLY;
snapshot2 = virDomainSnapshotCreateXML(dom, xml, flags);
if (snapshot2 == NULL)
goto cleanup;
virDomainSnapshotFree(snapshot2);
vshPrint(ctl, _("Snapshot %s set as current"), snapshotname);
ret = true;
goto cleanup;
}
current = virDomainHasCurrentSnapshot(dom, 0);
if (current < 0) {
goto cleanup;
} else if (!current) {
vshError(ctl, _("domain '%s' has no current snapshot"), domname);
goto cleanup;
} else {
const char *name = NULL;
if (!(snapshot = virDomainSnapshotCurrent(dom, 0)))
goto cleanup;
if (vshCommandOptBool(cmd, "name")) {
name = virDomainSnapshotGetName(snapshot);
if (!name)
goto cleanup;
} else {
xml = virDomainSnapshotGetXMLDesc(snapshot, flags);
if (!xml)
goto cleanup;
}
vshPrint(ctl, "%s", name ? name : xml);
}
ret = true;
cleanup:
if (!ret)
virshReportError(ctl);
VIR_FREE(xml);
if (snapshot)
virDomainSnapshotFree(snapshot);
if (dom)
virDomainFree(dom);
return ret;
}
/* Helper function to get the name of a snapshot's parent. Caller
* must free the result. Returns 0 on success (including when it was
* proven no parent exists), and -1 on failure with error reported
* (such as no snapshot support or domain deleted in meantime). */
static int
vshGetSnapshotParent(vshControl *ctl, virDomainSnapshotPtr snapshot,
char **parent_name)
{
virDomainSnapshotPtr parent = NULL;
char *xml = NULL;
xmlDocPtr xmldoc = NULL;
xmlXPathContextPtr ctxt = NULL;
int ret = -1;
*parent_name = NULL;
/* Try new API, since it is faster. */
if (!ctl->useSnapshotOld) {
parent = virDomainSnapshotGetParent(snapshot, 0);
if (parent) {
/* API works, and virDomainSnapshotGetName will succeed */
*parent_name = vshStrdup(ctl, virDomainSnapshotGetName(parent));
ret = 0;
goto cleanup;
}
if (last_error->code == VIR_ERR_NO_DOMAIN_SNAPSHOT) {
/* API works, and we found a root with no parent */
ret = 0;
goto cleanup;
}
/* API didn't work, fall back to XML scraping. */
ctl->useSnapshotOld = true;
}
xml = virDomainSnapshotGetXMLDesc(snapshot, 0);
if (!xml)
goto cleanup;
xmldoc = virXMLParseStringCtxt(xml, _("(domain_snapshot)"), &ctxt);
if (!xmldoc)
goto cleanup;
*parent_name = virXPathString("string(/domainsnapshot/parent/name)", ctxt);
ret = 0;
cleanup:
if (ret < 0) {
virshReportError(ctl);
vshError(ctl, "%s", _("unable to determine if snapshot has parent"));
} else {
vshResetLibvirtError();
}
if (parent)
virDomainSnapshotFree(parent);
xmlXPathFreeContext(ctxt);
xmlFreeDoc(xmldoc);
VIR_FREE(xml);
return ret;
}
/*
* "snapshot-info" command
*/
static const vshCmdInfo info_snapshot_info[] = {
{"help", N_("snapshot information")},
{"desc", N_("Returns basic information about a snapshot.")},
{NULL, NULL}
};
static const vshCmdOptDef opts_snapshot_info[] = {
{"domain", VSH_OT_DATA, VSH_OFLAG_REQ, N_("domain name, id or uuid")},
{"snapshotname", VSH_OT_DATA, 0, N_("snapshot name")},
{"current", VSH_OT_BOOL, 0, N_("info on current snapshot")},
{NULL, 0, 0, NULL}
};
static bool
cmdSnapshotInfo(vshControl *ctl, const vshCmd *cmd)
{
virDomainPtr dom;
virDomainSnapshotPtr snapshot = NULL;
const char *name;
char *doc = NULL;
char *tmp;
char *parent = NULL;
bool ret = false;
int count;
unsigned int flags;
int current;
int metadata;
if (!vshConnectionUsability(ctl, ctl->conn))
return false;
dom = vshCommandOptDomain(ctl, cmd, NULL);
if (dom == NULL)
return false;
if (vshLookupSnapshot(ctl, cmd, "snapshotname", true, dom,
&snapshot, &name) < 0)
goto cleanup;
vshPrint(ctl, "%-15s %s\n", _("Name:"), name);
vshPrint(ctl, "%-15s %s\n", _("Domain:"), virDomainGetName(dom));
/* Determine if snapshot is current; this is useful enough that we
* attempt a fallback. */
current = virDomainSnapshotIsCurrent(snapshot, 0);
if (current < 0) {
virDomainSnapshotPtr other = virDomainSnapshotCurrent(dom, 0);
vshResetLibvirtError();
current = 0;
if (other) {
if (STREQ(name, virDomainSnapshotGetName(other)))
current = 1;
virDomainSnapshotFree(other);
}
}
vshPrint(ctl, "%-15s %s\n", _("Current:"),
current > 0 ? _("yes") : _("no"));
/* Get the XML configuration of the snapshot to determine the
* state of the machine at the time of the snapshot. */
doc = virDomainSnapshotGetXMLDesc(snapshot, 0);
if (!doc)
goto cleanup;
tmp = strstr(doc, "<state>");
if (!tmp) {
vshError(ctl, "%s",
_("unexpected problem reading snapshot xml"));
goto cleanup;
}
tmp += strlen("<state>");
vshPrint(ctl, "%-15s %.*s\n", _("State:"),
(int) (strchr(tmp, '<') - tmp), tmp);
if (vshGetSnapshotParent(ctl, snapshot, &parent) < 0)
goto cleanup;
vshPrint(ctl, "%-15s %s\n", _("Parent:"), parent ? parent : "-");
/* Children, Descendants. After this point, the fallback to
* compute children is too expensive, so we gracefully quit if the
* APIs don't exist. */
if (ctl->useSnapshotOld) {
ret = true;
goto cleanup;
}
flags = 0;
count = virDomainSnapshotNumChildren(snapshot, flags);
if (count < 0)
goto cleanup;
vshPrint(ctl, "%-15s %d\n", _("Children:"), count);
flags = VIR_DOMAIN_SNAPSHOT_LIST_DESCENDANTS;
count = virDomainSnapshotNumChildren(snapshot, flags);
if (count < 0)
goto cleanup;
vshPrint(ctl, "%-15s %d\n", _("Descendants:"), count);
/* Metadata; the fallback here relies on the fact that metadata
* used to have an all-or-nothing effect on snapshot count. */
metadata = virDomainSnapshotHasMetadata(snapshot, 0);
if (metadata < 0) {
metadata = virDomainSnapshotNum(dom,
VIR_DOMAIN_SNAPSHOT_LIST_METADATA);
vshResetLibvirtError();
}
if (metadata >= 0)
vshPrint(ctl, "%-15s %s\n", _("Metadata:"),
metadata ? _("yes") : _("no"));
ret = true;
cleanup:
VIR_FREE(doc);
VIR_FREE(parent);
if (snapshot)
virDomainSnapshotFree(snapshot);
virDomainFree(dom);
return ret;
}
/* Helpers for collecting a list of snapshots. */
struct vshSnap {
virDomainSnapshotPtr snap;
char *parent;
};
struct vshSnapshotList {
struct vshSnap *snaps;
int nsnaps;
};
typedef struct vshSnapshotList *vshSnapshotListPtr;
static void
vshSnapshotListFree(vshSnapshotListPtr snaplist)
{
int i;
if (!snaplist)
return;
if (snaplist->snaps) {
for (i = 0; i < snaplist->nsnaps; i++) {
if (snaplist->snaps[i].snap)
virDomainSnapshotFree(snaplist->snaps[i].snap);
VIR_FREE(snaplist->snaps[i].parent);
}
VIR_FREE(snaplist->snaps);
}
VIR_FREE(snaplist);
}
static int
vshSnapSorter(const void *a, const void *b)
{
const struct vshSnap *sa = a;
const struct vshSnap *sb = b;
if (sa->snap && !sb->snap)
return -1;
if (!sa->snap)
return sb->snap != NULL;
/* User visible sort, so we want locale-specific case comparison. */
return strcasecmp(virDomainSnapshotGetName(sa->snap),
virDomainSnapshotGetName(sb->snap));
}
/* Compute a list of snapshots from DOM. If FROM is provided, the
* list is limited to descendants of the given snapshot. If FLAGS is
* given, the list is filtered. If TREE is specified, then all but
* FROM or the roots will also have parent information. */
static vshSnapshotListPtr
vshSnapshotListCollect(vshControl *ctl, virDomainPtr dom,
virDomainSnapshotPtr from,
unsigned int flags, bool tree)
{
int i;
char **names = NULL;
int count = -1;
bool descendants = false;
bool roots = false;
virDomainSnapshotPtr *snaps;
vshSnapshotListPtr snaplist = vshMalloc(ctl, sizeof(*snaplist));
vshSnapshotListPtr ret = NULL;
const char *fromname = NULL;
int start_index = -1;
int deleted = 0;
/* Try the interface available in 0.9.13 and newer. */
if (!ctl->useSnapshotOld) {
if (from)
count = virDomainSnapshotListAllChildren(from, &snaps, flags);
else
count = virDomainListAllSnapshots(dom, &snaps, flags);
}
if (count >= 0) {
/* When mixing --from and --tree, we also want a copy of from
* in the list, but with no parent for that one entry. */
snaplist->snaps = vshCalloc(ctl, count + (tree && from),
sizeof(*snaplist->snaps));
snaplist->nsnaps = count;
for (i = 0; i < count; i++)
snaplist->snaps[i].snap = snaps[i];
VIR_FREE(snaps);
if (tree) {
for (i = 0; i < count; i++) {
if (vshGetSnapshotParent(ctl, snaplist->snaps[i].snap,
&snaplist->snaps[i].parent) < 0)
goto cleanup;
}
if (from) {
snaps[snaplist->nsnaps++] = from;
virDomainSnapshotRef(from);
}
}
goto success;
}
/* Assume that if we got this far, then the --no-leaves and
* --no-metadata flags were not supported. Disable groups that
* have no impact. */
/* XXX should we emulate --no-leaves? */
if (flags & VIR_DOMAIN_SNAPSHOT_LIST_NO_LEAVES &&
flags & VIR_DOMAIN_SNAPSHOT_LIST_LEAVES)
flags &= ~(VIR_DOMAIN_SNAPSHOT_LIST_NO_LEAVES |
VIR_DOMAIN_SNAPSHOT_LIST_LEAVES);
if (flags & VIR_DOMAIN_SNAPSHOT_LIST_NO_METADATA &&
flags & VIR_DOMAIN_SNAPSHOT_LIST_METADATA)
flags &= ~(VIR_DOMAIN_SNAPSHOT_LIST_NO_METADATA |
VIR_DOMAIN_SNAPSHOT_LIST_METADATA);
if (flags & VIR_DOMAIN_SNAPSHOT_LIST_NO_METADATA) {
/* We can emulate --no-metadata if --metadata was supported,
* since it was an all-or-none attribute on old servers. */
count = virDomainSnapshotNum(dom,
VIR_DOMAIN_SNAPSHOT_LIST_METADATA);
if (count < 0)
goto cleanup;
if (count > 0)
return snaplist;
flags &= ~VIR_DOMAIN_SNAPSHOT_LIST_NO_METADATA;
}
/* This uses the interfaces available in 0.8.0-0.9.6
* (virDomainSnapshotListNames, global list only) and in
* 0.9.7-0.9.12 (addition of virDomainSnapshotListChildrenNames
* for child listing, and new flags), as follows, with [*] by the
* combinations that need parent info (either for filtering
* purposes or for the resulting tree listing):
* old new
* list global as-is global as-is
* list --roots *global + filter global + flags
* list --from *global + filter child as-is
* list --from --descendants *global + filter child + flags
* list --tree *global as-is *global as-is
* list --tree --from *global + filter *child + flags
*
* Additionally, when --tree and --from are both used, from is
* added to the final list as the only element without a parent.
* Otherwise, --from does not appear in the final list.
*/
if (from) {
fromname = virDomainSnapshotGetName(from);
if (!fromname) {
vshError(ctl, "%s", _("Could not get snapshot name"));
goto cleanup;
}
descendants = (flags & VIR_DOMAIN_SNAPSHOT_LIST_DESCENDANTS) || tree;
if (tree)
flags |= VIR_DOMAIN_SNAPSHOT_LIST_DESCENDANTS;
/* Determine if we can use the new child listing API. */
if (ctl->useSnapshotOld ||
((count = virDomainSnapshotNumChildren(from, flags)) < 0 &&
last_error->code == VIR_ERR_NO_SUPPORT)) {
/* We can emulate --from. */
/* XXX can we also emulate --leaves? */
vshResetLibvirtError();
ctl->useSnapshotOld = true;
flags &= ~VIR_DOMAIN_SNAPSHOT_LIST_DESCENDANTS;
goto global;
}
if (tree && count >= 0)
count++;
} else {
global:
/* Global listing (including fallback when --from failed with
* child listing). */
count = virDomainSnapshotNum(dom, flags);
/* Fall back to simulation if --roots was unsupported. */
/* XXX can we also emulate --leaves? */
if (!from && count < 0 && last_error->code == VIR_ERR_INVALID_ARG &&
(flags & VIR_DOMAIN_SNAPSHOT_LIST_ROOTS)) {
vshResetLibvirtError();
roots = true;
flags &= ~VIR_DOMAIN_SNAPSHOT_LIST_ROOTS;
count = virDomainSnapshotNum(dom, flags);
}
}
if (count < 0) {
if (!last_error)
vshError(ctl, _("failed to collect snapshot list"));
goto cleanup;
}
if (!count)
goto success;
names = vshCalloc(ctl, sizeof(*names), count);
/* Now that we have a count, collect the list. */
if (from && !ctl->useSnapshotOld) {
if (tree) {
if (count)
count = virDomainSnapshotListChildrenNames(from, names + 1,
count - 1, flags);
if (count >= 0) {
count++;
names[0] = vshStrdup(ctl, fromname);
}
} else {
count = virDomainSnapshotListChildrenNames(from, names,
count, flags);
}
} else {
count = virDomainSnapshotListNames(dom, names, count, flags);
}
if (count < 0)
goto cleanup;
snaplist->snaps = vshCalloc(ctl, sizeof(*snaplist->snaps), count);
snaplist->nsnaps = count;
for (i = 0; i < count; i++) {
snaplist->snaps[i].snap = virDomainSnapshotLookupByName(dom,
names[i], 0);
if (!snaplist->snaps[i].snap)
goto cleanup;
}
/* Collect parents when needed. With the new API, --tree and
* --from together put from as the first element without a parent;
* with the old API we still need to do a post-process filtering
* based on all parent information. */
if (tree || (from && ctl->useSnapshotOld) || roots) {
for (i = (from && !ctl->useSnapshotOld); i < count; i++) {
if (from && ctl->useSnapshotOld && STREQ(names[i], fromname)) {
start_index = i;
if (tree)
continue;
}
if (vshGetSnapshotParent(ctl, snaplist->snaps[i].snap,
&snaplist->snaps[i].parent) < 0)
goto cleanup;
if ((from && ((tree && !snaplist->snaps[i].parent) ||
(!descendants &&
STRNEQ_NULLABLE(fromname,
snaplist->snaps[i].parent)))) ||
(roots && snaplist->snaps[i].parent)) {
virDomainSnapshotFree(snaplist->snaps[i].snap);
snaplist->snaps[i].snap = NULL;
VIR_FREE(snaplist->snaps[i].parent);
deleted++;
}
}
}
if (tree)
goto success;
if (ctl->useSnapshotOld && descendants) {
bool changed = false;
bool remaining = false;
/* Make multiple passes over the list - first pass finds
* direct children and NULLs out all roots and from, remaining
* passes NULL out any undecided entry whose parent is not
* still in list. We mark known descendants by clearing
* snaps[i].parents. Sorry, this is O(n^3) - hope your
* hierarchy isn't huge. XXX Is it worth making O(n^2 log n)
* by using qsort and bsearch? */
if (start_index < 0) {
vshError(ctl, _("snapshot %s disappeared from list"), fromname);
goto cleanup;
}
for (i = 0; i < count; i++) {
if (i == start_index || !snaplist->snaps[i].parent) {
VIR_FREE(names[i]);
virDomainSnapshotFree(snaplist->snaps[i].snap);
snaplist->snaps[i].snap = NULL;
VIR_FREE(snaplist->snaps[i].parent);
deleted++;
} else if (STREQ(snaplist->snaps[i].parent, fromname)) {
VIR_FREE(snaplist->snaps[i].parent);
changed = true;
} else {
remaining = true;
}
}
if (!changed) {
ret = vshMalloc(ctl, sizeof(*snaplist));
goto cleanup;
}
while (changed && remaining) {
changed = remaining = false;
for (i = 0; i < count; i++) {
bool found_parent = false;
int j;
if (!names[i] || !snaplist->snaps[i].parent)
continue;
for (j = 0; j < count; j++) {
if (!names[j] || i == j)
continue;
if (STREQ(snaplist->snaps[i].parent, names[j])) {
found_parent = true;
if (!snaplist->snaps[j].parent)
VIR_FREE(snaplist->snaps[i].parent);
else
remaining = true;
break;
}
}
if (!found_parent) {
changed = true;
VIR_FREE(names[i]);
virDomainSnapshotFree(snaplist->snaps[i].snap);
snaplist->snaps[i].snap = NULL;
VIR_FREE(snaplist->snaps[i].parent);
deleted++;
}
}
}
}
success:
qsort(snaplist->snaps, snaplist->nsnaps, sizeof(*snaplist->snaps),
vshSnapSorter);
snaplist->nsnaps -= deleted;
ret = snaplist;
snaplist = NULL;
cleanup:
vshSnapshotListFree(snaplist);
if (names)
for (i = 0; i < count; i++)
VIR_FREE(names[i]);
VIR_FREE(names);
return ret;
}
static const char *
vshSnapshotListLookup(int id, bool parent, void *opaque)
{
vshSnapshotListPtr snaplist = opaque;
if (parent)
return snaplist->snaps[id].parent;
return virDomainSnapshotGetName(snaplist->snaps[id].snap);
}
/*
* "snapshot-list" command
*/
static const vshCmdInfo info_snapshot_list[] = {
{"help", N_("List snapshots for a domain")},
{"desc", N_("Snapshot List")},
{NULL, NULL}
};
static const vshCmdOptDef opts_snapshot_list[] = {
{"domain", VSH_OT_DATA, VSH_OFLAG_REQ, N_("domain name, id or uuid")},
{"parent", VSH_OT_BOOL, 0, N_("add a column showing parent snapshot")},
{"roots", VSH_OT_BOOL, 0, N_("list only snapshots without parents")},
{"leaves", VSH_OT_BOOL, 0, N_("list only snapshots without children")},
{"no-leaves", VSH_OT_BOOL, 0,
N_("list only snapshots that are not leaves (with children)")},
{"metadata", VSH_OT_BOOL, 0,
N_("list only snapshots that have metadata that would prevent undefine")},
{"no-metadata", VSH_OT_BOOL, 0,
N_("list only snapshots that have no metadata managed by libvirt")},
{"tree", VSH_OT_BOOL, 0, N_("list snapshots in a tree")},
{"from", VSH_OT_DATA, 0, N_("limit list to children of given snapshot")},
{"current", VSH_OT_BOOL, 0,
N_("limit list to children of current snapshot")},
{"descendants", VSH_OT_BOOL, 0, N_("with --from, list all descendants")},
{NULL, 0, 0, NULL}
};
static bool
cmdSnapshotList(vshControl *ctl, const vshCmd *cmd)
{
virDomainPtr dom = NULL;
bool ret = false;
unsigned int flags = 0;
bool show_parent = false;
int i;
xmlDocPtr xml = NULL;
xmlXPathContextPtr ctxt = NULL;
char *doc = NULL;
virDomainSnapshotPtr snapshot = NULL;
char *state = NULL;
char *parent = NULL;
long long creation_longlong;
time_t creation_time_t;
char timestr[100];
struct tm time_info;
bool tree = vshCommandOptBool(cmd, "tree");
bool leaves = vshCommandOptBool(cmd, "leaves");
bool no_leaves = vshCommandOptBool(cmd, "no-leaves");
const char *from = NULL;
virDomainSnapshotPtr start = NULL;
vshSnapshotListPtr snaplist = NULL;
if (!vshConnectionUsability(ctl, ctl->conn))
goto cleanup;
dom = vshCommandOptDomain(ctl, cmd, NULL);
if (dom == NULL)
goto cleanup;
if ((vshCommandOptBool(cmd, "from") ||
vshCommandOptBool(cmd, "current")) &&
vshLookupSnapshot(ctl, cmd, "from", true, dom, &start, &from) < 0)
goto cleanup;
if (vshCommandOptBool(cmd, "parent")) {
if (vshCommandOptBool(cmd, "roots")) {
vshError(ctl, "%s",
_("--parent and --roots are mutually exclusive"));
goto cleanup;
}
if (tree) {
vshError(ctl, "%s",
_("--parent and --tree are mutually exclusive"));
goto cleanup;
}
show_parent = true;
} else if (vshCommandOptBool(cmd, "roots")) {
if (tree) {
vshError(ctl, "%s",
_("--roots and --tree are mutually exclusive"));
goto cleanup;
}
if (from) {
vshError(ctl, "%s",
_("--roots and --from are mutually exclusive"));
goto cleanup;
}
flags |= VIR_DOMAIN_SNAPSHOT_LIST_ROOTS;
}
if (leaves) {
if (tree) {
vshError(ctl, "%s",
_("--leaves and --tree are mutually exclusive"));
goto cleanup;
}
flags |= VIR_DOMAIN_SNAPSHOT_LIST_LEAVES;
}
if (no_leaves) {
if (tree) {
vshError(ctl, "%s",
_("--no-leaves and --tree are mutually exclusive"));
goto cleanup;
}
flags |= VIR_DOMAIN_SNAPSHOT_LIST_NO_LEAVES;
}
if (vshCommandOptBool(cmd, "metadata")) {
flags |= VIR_DOMAIN_SNAPSHOT_LIST_METADATA;
}
if (vshCommandOptBool(cmd, "no-metadata")) {
flags |= VIR_DOMAIN_SNAPSHOT_LIST_NO_METADATA;
}
if (vshCommandOptBool(cmd, "descendants")) {
if (!from) {
vshError(ctl, "%s",
_("--descendants requires either --from or --current"));
goto cleanup;
}
flags |= VIR_DOMAIN_SNAPSHOT_LIST_DESCENDANTS;
}
if ((snaplist = vshSnapshotListCollect(ctl, dom, start, flags,
tree)) == NULL)
goto cleanup;
if (!tree) {
if (show_parent)
vshPrintExtra(ctl, " %-20s %-25s %-15s %s",
_("Name"), _("Creation Time"), _("State"),
_("Parent"));
else
vshPrintExtra(ctl, " %-20s %-25s %s",
_("Name"), _("Creation Time"), _("State"));
vshPrintExtra(ctl, "\n"
"------------------------------------------------------------\n");
}
if (!snaplist->nsnaps) {
ret = true;
goto cleanup;
}
if (tree) {
for (i = 0; i < snaplist->nsnaps; i++) {
if (!snaplist->snaps[i].parent &&
vshTreePrint(ctl, vshSnapshotListLookup, snaplist,
snaplist->nsnaps, i) < 0)
goto cleanup;
}
ret = true;
goto cleanup;
}
for (i = 0; i < snaplist->nsnaps; i++) {
const char *name;
/* free up memory from previous iterations of the loop */
VIR_FREE(parent);
VIR_FREE(state);
xmlXPathFreeContext(ctxt);
xmlFreeDoc(xml);
VIR_FREE(doc);
snapshot = snaplist->snaps[i].snap;
name = virDomainSnapshotGetName(snapshot);
assert(name);
doc = virDomainSnapshotGetXMLDesc(snapshot, 0);
if (!doc)
continue;
xml = virXMLParseStringCtxt(doc, _("(domain_snapshot)"), &ctxt);
if (!xml)
continue;
if (show_parent)
parent = virXPathString("string(/domainsnapshot/parent/name)",
ctxt);
state = virXPathString("string(/domainsnapshot/state)", ctxt);
if (state == NULL)
continue;
if (virXPathLongLong("string(/domainsnapshot/creationTime)", ctxt,
&creation_longlong) < 0)
continue;
creation_time_t = creation_longlong;
if (creation_time_t != creation_longlong) {
vshError(ctl, "%s", _("time_t overflow"));
continue;
}
localtime_r(&creation_time_t, &time_info);
strftime(timestr, sizeof(timestr), "%Y-%m-%d %H:%M:%S %z",
&time_info);
if (parent)
vshPrint(ctl, " %-20s %-25s %-15s %s\n",
name, timestr, state, parent);
else
vshPrint(ctl, " %-20s %-25s %s\n", name, timestr, state);
}
ret = true;
cleanup:
/* this frees up memory from the last iteration of the loop */
vshSnapshotListFree(snaplist);
VIR_FREE(parent);
VIR_FREE(state);
if (start)
virDomainSnapshotFree(start);
xmlXPathFreeContext(ctxt);
xmlFreeDoc(xml);
VIR_FREE(doc);
if (dom)
virDomainFree(dom);
return ret;
}
/*
* "snapshot-dumpxml" command
*/
static const vshCmdInfo info_snapshot_dumpxml[] = {
{"help", N_("Dump XML for a domain snapshot")},
{"desc", N_("Snapshot Dump XML")},
{NULL, NULL}
};
static const vshCmdOptDef opts_snapshot_dumpxml[] = {
{"domain", VSH_OT_DATA, VSH_OFLAG_REQ, N_("domain name, id or uuid")},
{"snapshotname", VSH_OT_DATA, VSH_OFLAG_REQ, N_("snapshot name")},
{"security-info", VSH_OT_BOOL, 0,
N_("include security sensitive information in XML dump")},
{NULL, 0, 0, NULL}
};
static bool
cmdSnapshotDumpXML(vshControl *ctl, const vshCmd *cmd)
{
virDomainPtr dom = NULL;
bool ret = false;
const char *name = NULL;
virDomainSnapshotPtr snapshot = NULL;
char *xml = NULL;
unsigned int flags = 0;
if (vshCommandOptBool(cmd, "security-info"))
flags |= VIR_DOMAIN_XML_SECURE;
if (!vshConnectionUsability(ctl, ctl->conn))
goto cleanup;
dom = vshCommandOptDomain(ctl, cmd, NULL);
if (dom == NULL)
goto cleanup;
if (vshCommandOptString(cmd, "snapshotname", &name) <= 0)
goto cleanup;
snapshot = virDomainSnapshotLookupByName(dom, name, 0);
if (snapshot == NULL)
goto cleanup;
xml = virDomainSnapshotGetXMLDesc(snapshot, flags);
if (!xml)
goto cleanup;
vshPrint(ctl, "%s", xml);
ret = true;
cleanup:
VIR_FREE(xml);
if (snapshot)
virDomainSnapshotFree(snapshot);
if (dom)
virDomainFree(dom);
return ret;
}
/*
* "snapshot-parent" command
*/
static const vshCmdInfo info_snapshot_parent[] = {
{"help", N_("Get the name of the parent of a snapshot")},
{"desc", N_("Extract the snapshot's parent, if any")},
{NULL, NULL}
};
static const vshCmdOptDef opts_snapshot_parent[] = {
{"domain", VSH_OT_DATA, VSH_OFLAG_REQ, N_("domain name, id or uuid")},
{"snapshotname", VSH_OT_DATA, 0, N_("find parent of snapshot name")},
{"current", VSH_OT_BOOL, 0, N_("find parent of current snapshot")},
{NULL, 0, 0, NULL}
};
static bool
cmdSnapshotParent(vshControl *ctl, const vshCmd *cmd)
{
virDomainPtr dom = NULL;
bool ret = false;
const char *name = NULL;
virDomainSnapshotPtr snapshot = NULL;
char *parent = NULL;
if (!vshConnectionUsability(ctl, ctl->conn))
goto cleanup;
dom = vshCommandOptDomain(ctl, cmd, NULL);
if (dom == NULL)
goto cleanup;
if (vshLookupSnapshot(ctl, cmd, "snapshotname", true, dom,
&snapshot, &name) < 0)
goto cleanup;
if (vshGetSnapshotParent(ctl, snapshot, &parent) < 0)
goto cleanup;
if (!parent) {
vshError(ctl, _("snapshot '%s' has no parent"), name);
goto cleanup;
}
vshPrint(ctl, "%s", parent);
ret = true;
cleanup:
VIR_FREE(parent);
if (snapshot)
virDomainSnapshotFree(snapshot);
if (dom)
virDomainFree(dom);
return ret;
}
/*
* "snapshot-revert" command
*/
static const vshCmdInfo info_snapshot_revert[] = {
{"help", N_("Revert a domain to a snapshot")},
{"desc", N_("Revert domain to snapshot")},
{NULL, NULL}
};
static const vshCmdOptDef opts_snapshot_revert[] = {
{"domain", VSH_OT_DATA, VSH_OFLAG_REQ, N_("domain name, id or uuid")},
{"snapshotname", VSH_OT_DATA, 0, N_("snapshot name")},
{"current", VSH_OT_BOOL, 0, N_("revert to current snapshot")},
{"running", VSH_OT_BOOL, 0, N_("after reverting, change state to running")},
{"paused", VSH_OT_BOOL, 0, N_("after reverting, change state to paused")},
{"force", VSH_OT_BOOL, 0, N_("try harder on risky reverts")},
{NULL, 0, 0, NULL}
};
static bool
cmdDomainSnapshotRevert(vshControl *ctl, const vshCmd *cmd)
{
virDomainPtr dom = NULL;
bool ret = false;
const char *name = NULL;
virDomainSnapshotPtr snapshot = NULL;
unsigned int flags = 0;
bool force = false;
int result;
if (vshCommandOptBool(cmd, "running"))
flags |= VIR_DOMAIN_SNAPSHOT_REVERT_RUNNING;
if (vshCommandOptBool(cmd, "paused"))
flags |= VIR_DOMAIN_SNAPSHOT_REVERT_PAUSED;
/* We want virsh snapshot-revert --force to work even when talking
* to older servers that did the unsafe revert by default but
* reject the flag, so we probe without the flag, and only use it
* when the error says it will make a difference. */
if (vshCommandOptBool(cmd, "force"))
force = true;
if (!vshConnectionUsability(ctl, ctl->conn))
goto cleanup;
dom = vshCommandOptDomain(ctl, cmd, NULL);
if (dom == NULL)
goto cleanup;
if (vshLookupSnapshot(ctl, cmd, "snapshotname", true, dom,
&snapshot, &name) < 0)
goto cleanup;
result = virDomainRevertToSnapshot(snapshot, flags);
if (result < 0 && force &&
last_error->code == VIR_ERR_SNAPSHOT_REVERT_RISKY) {
flags |= VIR_DOMAIN_SNAPSHOT_REVERT_FORCE;
vshResetLibvirtError();
result = virDomainRevertToSnapshot(snapshot, flags);
}
if (result < 0)
goto cleanup;
ret = true;
cleanup:
if (snapshot)
virDomainSnapshotFree(snapshot);
if (dom)
virDomainFree(dom);
return ret;
}
/*
* "snapshot-delete" command
*/
static const vshCmdInfo info_snapshot_delete[] = {
{"help", N_("Delete a domain snapshot")},
{"desc", N_("Snapshot Delete")},
{NULL, NULL}
};
static const vshCmdOptDef opts_snapshot_delete[] = {
{"domain", VSH_OT_DATA, VSH_OFLAG_REQ, N_("domain name, id or uuid")},
{"snapshotname", VSH_OT_DATA, 0, N_("snapshot name")},
{"current", VSH_OT_BOOL, 0, N_("delete current snapshot")},
{"children", VSH_OT_BOOL, 0, N_("delete snapshot and all children")},
{"children-only", VSH_OT_BOOL, 0, N_("delete children but not snapshot")},
{"metadata", VSH_OT_BOOL, 0,
N_("delete only libvirt metadata, leaving snapshot contents behind")},
{NULL, 0, 0, NULL}
};
static bool
cmdSnapshotDelete(vshControl *ctl, const vshCmd *cmd)
{
virDomainPtr dom = NULL;
bool ret = false;
const char *name = NULL;
virDomainSnapshotPtr snapshot = NULL;
unsigned int flags = 0;
if (!vshConnectionUsability(ctl, ctl->conn))
goto cleanup;
dom = vshCommandOptDomain(ctl, cmd, NULL);
if (dom == NULL)
goto cleanup;
if (vshLookupSnapshot(ctl, cmd, "snapshotname", true, dom,
&snapshot, &name) < 0)
goto cleanup;
if (vshCommandOptBool(cmd, "children"))
flags |= VIR_DOMAIN_SNAPSHOT_DELETE_CHILDREN;
if (vshCommandOptBool(cmd, "children-only"))
flags |= VIR_DOMAIN_SNAPSHOT_DELETE_CHILDREN_ONLY;
if (vshCommandOptBool(cmd, "metadata"))
flags |= VIR_DOMAIN_SNAPSHOT_DELETE_METADATA_ONLY;
/* XXX If we wanted, we could emulate DELETE_CHILDREN_ONLY even on
* older servers that reject the flag, by manually computing the
* list of descendants. But that's a lot of code to maintain. */
if (virDomainSnapshotDelete(snapshot, flags) == 0) {
if (flags & VIR_DOMAIN_SNAPSHOT_DELETE_CHILDREN_ONLY)
vshPrint(ctl, _("Domain snapshot %s children deleted\n"), name);
else
vshPrint(ctl, _("Domain snapshot %s deleted\n"), name);
} else {
vshError(ctl, _("Failed to delete snapshot %s"), name);
goto cleanup;
}
ret = true;
cleanup:
if (snapshot)
virDomainSnapshotFree(snapshot);
if (dom)
virDomainFree(dom);
return ret;
}
static const vshCmdDef snapshotCmds[] = {
{"snapshot-create", cmdSnapshotCreate, opts_snapshot_create,
info_snapshot_create, 0},
{"snapshot-create-as", cmdSnapshotCreateAs, opts_snapshot_create_as,
info_snapshot_create_as, 0},
{"snapshot-current", cmdSnapshotCurrent, opts_snapshot_current,
info_snapshot_current, 0},
{"snapshot-delete", cmdSnapshotDelete, opts_snapshot_delete,
info_snapshot_delete, 0},
{"snapshot-dumpxml", cmdSnapshotDumpXML, opts_snapshot_dumpxml,
info_snapshot_dumpxml, 0},
{"snapshot-edit", cmdSnapshotEdit, opts_snapshot_edit,
info_snapshot_edit, 0},
{"snapshot-info", cmdSnapshotInfo, opts_snapshot_info,
info_snapshot_info, 0},
{"snapshot-list", cmdSnapshotList, opts_snapshot_list,
info_snapshot_list, 0},
{"snapshot-parent", cmdSnapshotParent, opts_snapshot_parent,
info_snapshot_parent, 0},
{"snapshot-revert", cmdDomainSnapshotRevert, opts_snapshot_revert,
info_snapshot_revert, 0},
{NULL, NULL, NULL, NULL, 0}
};
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