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virsh: Use vshWatchJob in cmdManagedSave

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This patch alters saving code, so we can report progress
and allow cancel via ^C.
This commit is contained in:
Michal Privoznik 2011-12-20 15:50:52 +01:00
parent 6e4c540d28
commit 74ad69b708
2 changed files with 69 additions and 13 deletions
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74
tools/virsh.c
View File

@ -2738,19 +2738,29 @@ static const vshCmdOptDef opts_managedsave[] = {
{"domain", VSH_OT_DATA, VSH_OFLAG_REQ, N_("domain name, id or uuid")},
{"running", VSH_OT_BOOL, 0, N_("set domain to be running on next start")},
{"paused", VSH_OT_BOOL, 0, N_("set domain to be paused on next start")},
{"verbose", VSH_OT_BOOL, 0, N_("display the progress of save")},
{NULL, 0, 0, NULL}
};
static bool
cmdManagedSave(vshControl *ctl, const vshCmd *cmd)
static void
doManagedsave(void *opaque)
{
virDomainPtr dom;
char ret = '1';
vshCtrlData *data = opaque;
vshControl *ctl = data->ctl;
const vshCmd *cmd = data->cmd;
virDomainPtr dom = NULL;
const char *name;
bool ret = false;
unsigned int flags = 0;
sigset_t sigmask, oldsigmask;
sigemptyset(&sigmask);
sigaddset(&sigmask, SIGINT);
if (pthread_sigmask(SIG_BLOCK, &sigmask, &oldsigmask) < 0)
goto out_sig;
if (!vshConnectionUsability(ctl, ctl->conn))
return false;
goto out;
if (vshCommandOptBool(cmd, "bypass-cache"))
flags |= VIR_DOMAIN_SAVE_BYPASS_CACHE;
@ -2760,18 +2770,64 @@ cmdManagedSave(vshControl *ctl, const vshCmd *cmd)
flags |= VIR_DOMAIN_SAVE_PAUSED;
if (!(dom = vshCommandOptDomain(ctl, cmd, &name)))
return false;
goto out;
if (virDomainManagedSave(dom, flags) < 0) {
vshError(ctl, _("Failed to save domain %s state"), name);
goto cleanup;
goto out;
}
vshPrint(ctl, _("Domain %s state saved by libvirt\n"), name);
ret = true;
ret = '0';
out:
pthread_sigmask(SIG_SETMASK, &oldsigmask, NULL);
out_sig:
if (dom)
virDomainFree (dom);
ignore_value(safewrite(data->writefd, &ret, sizeof(ret)));
}
static bool
cmdManagedSave(vshControl *ctl, const vshCmd *cmd)
{
virDomainPtr dom;
int p[2] = { -1, -1};
bool ret = false;
bool verbose = false;
const char *name = NULL;
vshCtrlData data;
virThread workerThread;
if (!(dom = vshCommandOptDomain(ctl, cmd, &name)))
return false;
if (vshCommandOptBool (cmd, "verbose"))
verbose = true;
if (pipe(p) < 0)
goto cleanup;
data.ctl = ctl;
data.cmd = cmd;
data.writefd = p[1];
if (virThreadCreate(&workerThread,
true,
doManagedsave,
&data) < 0)
goto cleanup;
ret = vshWatchJob(ctl, dom, verbose, p[0], 0,
NULL, NULL, _("Managedsave"));
virThreadJoin(&workerThread);
if (ret)
vshPrint(ctl, _("\nDomain %s state saved by libvirt\n"), name);
cleanup:
virDomainFree(dom);
VIR_FORCE_CLOSE(p[0]);
VIR_FORCE_CLOSE(p[1]);
return ret;
}

8
tools/virsh.pod
View File

@ -737,7 +737,7 @@ The editor used can be supplied by the C<$VISUAL> or C<$EDITOR> environment
variables, and defaults to C<vi>.
=item B<managedsave> I<domain-id> [I<--bypass-cache>]
[{I<--running> | I<--paused>}]
[{I<--running> | I<--paused>}] [I<--verbose>]
Save and destroy (stop) a running domain, so it can be restarted from the same
state at a later time. When the virsh B<start> command is next run for
@ -746,9 +746,9 @@ If I<--bypass-cache> is specified, the save will avoid the file system
cache, although this may slow down the operation.
The progress may be monitored using B<domjobinfo> virsh command and canceled
with B<domjobabort> command (sent by another virsh instance). Interrupting
(usually with C<Ctrl-C>) the virsh process which runs B<managedsave> command
is not enough to actually cancel the operation.
with B<domjobabort> command (sent by another virsh instance). Another option
is to send SIGINT (usually with C<Ctrl-C>) to the virsh process running
B<managedsave> command. I<--verbose> displays the progress of save.
Normally, starting a managed save will decide between running or paused
based on the state the domain was in when the save was done; passing