[libvirt] [PATCH v5 13/20] wip: backup: virsh support for backup
Eric Blake
eblake at redhat.com
Thu Mar 7 05:47:45 UTC 2019
---
tools/virsh-domain.c | 247 +++++++++++++++++++++++++++++++++++++++++++
tools/virsh.pod | 32 ++++++
2 files changed, 279 insertions(+)
diff --git a/tools/virsh-domain.c b/tools/virsh-domain.c
index 23169f0569..8a06168f6f 100644
--- a/tools/virsh-domain.c
+++ b/tools/virsh-domain.c
@@ -14034,6 +14034,235 @@ cmdDomFSInfo(vshControl *ctl, const vshCmd *cmd)
return ret;
}
+
+/*
+ * "backup-begin" command
+ */
+static const vshCmdInfo info_backup_begin[] = {
+ {.name = "help",
+ .data = N_("Start a disk backup of a live domain")
+ },
+ {.name = "desc",
+ .data = N_("Use XML to start a full or incremental disk backup of a live "
+ "domain, optionally creating a checkpoint")
+ },
+ {.name = NULL}
+};
+
+static const vshCmdOptDef opts_backup_begin[] = {
+ VIRSH_COMMON_OPT_DOMAIN_FULL(0),
+ {.name = "xmlfile",
+ .type = VSH_OT_STRING,
+ .help = N_("domain backup XML"),
+ },
+ {.name = "checkpointxml",
+ .type = VSH_OT_STRING,
+ .help = N_("domain checkpoint XML"),
+ },
+ {.name = "no-metadata",
+ .type = VSH_OT_BOOL,
+ .help = N_("create checkpoint but don't track metadata"),
+ },
+ {.name = "quiesce",
+ .type = VSH_OT_BOOL,
+ .help = N_("quiesce guest's file systems"),
+ },
+ /* TODO: --wait/--verbose/--timeout flags for push model backups? */
+ {.name = NULL}
+};
+
+static bool
+cmdBackupBegin(vshControl *ctl,
+ const vshCmd *cmd)
+{
+ virDomainPtr dom = NULL;
+ bool ret = false;
+ const char *backup_from = NULL;
+ char *backup_buffer = NULL;
+ const char *check_from = NULL;
+ char *check_buffer = NULL;
+ unsigned int flags = 0;
+ int id;
+
+ if (vshCommandOptBool(cmd, "no-metadata"))
+ flags |= VIR_DOMAIN_BACKUP_BEGIN_NO_METADATA;
+ if (vshCommandOptBool(cmd, "quiesce"))
+ flags |= VIR_DOMAIN_BACKUP_BEGIN_QUIESCE;
+
+ if (!(dom = virshCommandOptDomain(ctl, cmd, NULL)))
+ goto cleanup;
+
+ if (vshCommandOptStringReq(ctl, cmd, "xmlfile", &backup_from) < 0)
+ goto cleanup;
+ if (!backup_from) {
+ backup_buffer = vshStrdup(ctl, "<domainbackup/>");
+ } else {
+ if (virFileReadAll(backup_from, VSH_MAX_XML_FILE, &backup_buffer) < 0) {
+ vshSaveLibvirtError();
+ goto cleanup;
+ }
+ }
+
+ if (vshCommandOptStringReq(ctl, cmd, "checkpointxml", &check_from) < 0)
+ goto cleanup;
+ if (check_from) {
+ if (virFileReadAll(check_from, VSH_MAX_XML_FILE, &check_buffer) < 0) {
+ vshSaveLibvirtError();
+ goto cleanup;
+ }
+ }
+
+ id = virDomainBackupBegin(dom, backup_buffer, check_buffer, flags);
+
+ if (id < 0)
+ goto cleanup;
+
+ vshPrint(ctl, _("Backup id %d started\n"), id);
+ if (backup_from)
+ vshPrintExtra(ctl, _("backup used description from '%s'\n"),
+ backup_from);
+ if (check_buffer)
+ vshPrintExtra(ctl, _("checkpoint created from '%s'\n"), check_from);
+
+ ret = true;
+
+ cleanup:
+ VIR_FREE(backup_buffer);
+ VIR_FREE(check_buffer);
+ virshDomainFree(dom);
+
+ return ret;
+}
+
+/* TODO: backup-begin-as? */
+
+/*
+ * "backup-dumpxml" command
+ */
+static const vshCmdInfo info_backup_dumpxml[] = {
+ {.name = "help",
+ .data = N_("Dump XML for an ongoing domain block backup job")
+ },
+ {.name = "desc",
+ .data = N_("Backup Dump XML")
+ },
+ {.name = NULL}
+};
+
+static const vshCmdOptDef opts_backup_dumpxml[] = {
+ VIRSH_COMMON_OPT_DOMAIN_FULL(0),
+ {.name = "id",
+ .type = VSH_OT_INT,
+ .flags = VSH_OFLAG_REQ,
+ .help = N_("backup job id"),
+ /* TODO: Add API for listing active jobs, then adding a completer? */
+ },
+ /* TODO - worth adding this flag?
+ {.name = "checkpoint",
+ .type = VSH_OT_BOOL,
+ .help = N_("if the backup created a checkpoint, also dump that XML")
+ },
+ */
+ {.name = NULL}
+};
+
+static bool
+cmdBackupDumpXML(vshControl *ctl,
+ const vshCmd *cmd)
+{
+ virDomainPtr dom = NULL;
+ bool ret = false;
+ char *xml = NULL;
+ unsigned int flags = 0;
+ int id;
+
+ if (vshCommandOptBool(cmd, "security-info"))
+ flags |= VIR_DOMAIN_XML_SECURE;
+
+ if (vshCommandOptInt(ctl, cmd, "id", &id) < 0)
+ return false;
+
+ if (!(dom = virshCommandOptDomain(ctl, cmd, NULL)))
+ return false;
+
+ if (!(xml = virDomainBackupGetXMLDesc(dom, id, flags)))
+ goto cleanup;
+
+ vshPrint(ctl, "%s", xml);
+ ret = true;
+
+ cleanup:
+ VIR_FREE(xml);
+ virshDomainFree(dom);
+
+ return ret;
+}
+
+
+/*
+ * "backup-end" command
+ */
+static const vshCmdInfo info_backup_end[] = {
+ {.name = "help",
+ .data = N_("Conclude a disk backup of a live domain")
+ },
+ {.name = "desc",
+ .data = N_("End a domain block backup job")
+ },
+ {.name = NULL}
+};
+
+static const vshCmdOptDef opts_backup_end[] = {
+ VIRSH_COMMON_OPT_DOMAIN_FULL(0),
+ {.name = "id",
+ .type = VSH_OT_INT,
+ .flags = VSH_OFLAG_REQ,
+ .help = N_("backup job id"),
+ /* TODO: Add API for listing active jobs, then adding a completer? */
+ },
+ {.name = "abort",
+ .type = VSH_OT_BOOL,
+ .help = N_("abandon a push model backup that has not yet completed")
+ },
+ {.name = NULL}
+};
+
+static bool
+cmdBackupEnd(vshControl *ctl, const vshCmd *cmd)
+{
+ virDomainPtr dom = NULL;
+ bool ret = false;
+ unsigned int flags = 0;
+ int id;
+ int rc;
+
+ if (vshCommandOptBool(cmd, "abort"))
+ flags |= VIR_DOMAIN_BACKUP_END_ABORT;
+
+ if (vshCommandOptInt(ctl, cmd, "id", &id) < 0)
+ return false;
+
+ if (!(dom = virshCommandOptDomain(ctl, cmd, NULL)))
+ goto cleanup;
+
+ rc = virDomainBackupEnd(dom, id, flags);
+
+ if (rc < 0)
+ goto cleanup;
+ if (rc == 0)
+ vshPrint(ctl, _("Backup id %d aborted"), id);
+ else
+ vshPrint(ctl, _("Backup id %d completed"), id);
+
+ ret = true;
+
+ cleanup:
+ virshDomainFree(dom);
+
+ return ret;
+}
+
+
const vshCmdDef domManagementCmds[] = {
{.name = "attach-device",
.handler = cmdAttachDevice,
@@ -14059,6 +14288,24 @@ const vshCmdDef domManagementCmds[] = {
.info = info_autostart,
.flags = 0
},
+ {.name = "backup-begin",
+ .handler = cmdBackupBegin,
+ .opts = opts_backup_begin,
+ .info = info_backup_begin,
+ .flags = 0
+ },
+ {.name = "backup-dumpxml",
+ .handler = cmdBackupDumpXML,
+ .opts = opts_backup_dumpxml,
+ .info = info_backup_dumpxml,
+ .flags = 0
+ },
+ {.name = "backup-end",
+ .handler = cmdBackupEnd,
+ .opts = opts_backup_end,
+ .info = info_backup_end,
+ .flags = 0
+ },
{.name = "blkdeviotune",
.handler = cmdBlkdeviotune,
.opts = opts_blkdeviotune,
diff --git a/tools/virsh.pod b/tools/virsh.pod
index d70f2ecd0c..2edcecec4e 100644
--- a/tools/virsh.pod
+++ b/tools/virsh.pod
@@ -1344,6 +1344,38 @@ I<bandwidth> specifies copying bandwidth limit in MiB/s. For further information
on the I<bandwidth> argument see the corresponding section for the B<blockjob>
command.
+=item B<backup-begin> I<domain> [I<xmlfile>]
+[I<checkpointxml> [I<--no-metadata>]] [I<--quiesce>]
+
+Begin a new backup job, and output the resulting job id on success. If
+I<xmlfile> is omitted, this defaults to a full backup using a push
+model to filenames generated by libvirt; supplying XML allows
+fine-tuning such as requesting an incremental backup relative to an
+earlier checkpoint, controlling which disks participate or which
+filenames are involved, or requesting the use of a pull model backup.
+The B<backup-dumpxml> command shows any resulting values assigned by
+libvirt. For more information on backup XML, see:
+L<https://libvirt.org/formatbackup.html>.
+
+This command returns as soon as possible, and the backup job runs in
+the background; the progress of a push model backup can be checked
+with B<domjobinfo> or by waiting for an event with B<event> (the
+progress of a pull model backup is under the control of whatever third
+party connects to the NBD export). The job is ended with B<block-end>.
+
+FIXME
+I<--checkpointxml>
+I<--no-metadata>
+I<--quiesce>
+
+=item B<backup-dumpxml> I<domain> I<id>
+
+FIXME
+
+=item B<backup-end> I<domain> I<id> [I<--abort>]
+
+FIXME
+
=item B<blkdeviotune> I<domain> I<device>
[[I<--config>] [I<--live>] | [I<--current>]]
[[I<total-bytes-sec>] | [I<read-bytes-sec>] [I<write-bytes-sec>]]
--
2.20.1
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