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blockjob: add virsh blockpull --wait
I'm tired of shell-scripting to wait for completion of a block pull, when virsh can be taught to do the same. I couldn't quite reuse vshWatchJob, as this is not a case of a long-running command where a second thread must be used to probe job status (at least, not unless I make virsh start doing blocking waits for an event to fire), but it served as inspiration for my simpler single-threaded loop. There is up to a half-second delay between sending SIGINT and the job being aborted, but I didn't think it worth the complexity of a second thread and use of poll() just to minimize that delay. * tools/virsh.c (cmdBlockPull): Add new options to wait for completion. (blockJobImpl): Add argument. (cmdBlockJob): Adjust caller. * tools/virsh.pod (blockjob): Document new mode.
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parent
6fb8a64d93
commit
3b96a89242
120
tools/virsh.c
120
tools/virsh.c
@ -7521,7 +7521,8 @@ typedef enum {
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static int
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blockJobImpl(vshControl *ctl, const vshCmd *cmd,
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virDomainBlockJobInfoPtr info, int mode)
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virDomainBlockJobInfoPtr info, int mode,
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virDomainPtr *pdom)
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{
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virDomainPtr dom = NULL;
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const char *name, *path;
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@ -7562,7 +7563,9 @@ blockJobImpl(vshControl *ctl, const vshCmd *cmd,
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}
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cleanup:
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if (dom)
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if (pdom && ret == 0)
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*pdom = dom;
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else if (dom)
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virDomainFree(dom);
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return ret;
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}
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@ -7582,15 +7585,122 @@ static const vshCmdOptDef opts_block_pull[] = {
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{"bandwidth", VSH_OT_DATA, VSH_OFLAG_NONE, N_("Bandwidth limit in MB/s")},
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{"base", VSH_OT_DATA, VSH_OFLAG_NONE,
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N_("path of backing file in chain for a partial pull")},
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{"wait", VSH_OT_BOOL, 0, N_("wait for job to finish")},
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{"verbose", VSH_OT_BOOL, 0, N_("with --wait, display the progress")},
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{"timeout", VSH_OT_INT, VSH_OFLAG_NONE,
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N_("with --wait, abort if pull exceeds timeout (in seconds)")},
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{"async", VSH_OT_BOOL, 0,
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N_("with --wait, don't wait for cancel to finish")},
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{NULL, 0, 0, NULL}
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};
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static bool
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cmdBlockPull(vshControl *ctl, const vshCmd *cmd)
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{
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if (blockJobImpl(ctl, cmd, NULL, VSH_CMD_BLOCK_JOB_PULL) != 0)
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virDomainPtr dom = NULL;
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bool ret = false;
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bool blocking = vshCommandOptBool(cmd, "wait");
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bool verbose = vshCommandOptBool(cmd, "verbose");
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int timeout = 0;
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struct sigaction sig_action;
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struct sigaction old_sig_action;
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sigset_t sigmask;
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struct timeval start;
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struct timeval curr;
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const char *path = NULL;
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bool quit = false;
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int abort_flags = 0;
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if (blocking) {
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if (vshCommandOptInt(cmd, "timeout", &timeout) > 0) {
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if (timeout < 1) {
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vshError(ctl, "%s", _("invalid timeout"));
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return false;
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}
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/* Ensure that we can multiply by 1000 without overflowing. */
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if (timeout > INT_MAX / 1000) {
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vshError(ctl, "%s", _("timeout is too big"));
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return false;
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}
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}
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if (vshCommandOptString(cmd, "path", &path) < 0)
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return false;
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if (vshCommandOptBool(cmd, "async"))
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abort_flags |= VIR_DOMAIN_BLOCK_JOB_ABORT_ASYNC;
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sigemptyset(&sigmask);
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sigaddset(&sigmask, SIGINT);
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intCaught = 0;
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sig_action.sa_sigaction = vshCatchInt;
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sigemptyset(&sig_action.sa_mask);
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sigaction(SIGINT, &sig_action, &old_sig_action);
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GETTIMEOFDAY(&start);
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} else if (verbose || vshCommandOptBool(cmd, "timeout") ||
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vshCommandOptBool(cmd, "async")) {
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vshError(ctl, "%s", _("blocking control options require --wait"));
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return false;
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return true;
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}
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if (blockJobImpl(ctl, cmd, NULL, VSH_CMD_BLOCK_JOB_PULL, &dom) < 0)
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goto cleanup;
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if (!blocking) {
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vshPrint(ctl, "%s", _("Block Pull started"));
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ret = true;
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goto cleanup;
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}
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while (blocking) {
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virDomainBlockJobInfo info;
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int result = virDomainGetBlockJobInfo(dom, path, &info, 0);
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if (result < 0) {
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vshError(ctl, _("failed to query job for disk %s"), path);
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goto cleanup;
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}
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if (result == 0)
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break;
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if (verbose)
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print_job_progress(_("Block Pull"), info.end - info.cur, info.end);
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GETTIMEOFDAY(&curr);
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if (intCaught || (timeout &&
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(((int)(curr.tv_sec - start.tv_sec) * 1000 +
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(int)(curr.tv_usec - start.tv_usec) / 1000) >
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timeout * 1000))) {
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vshDebug(ctl, VSH_ERR_DEBUG,
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intCaught ? "interrupted" : "timeout");
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intCaught = 0;
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timeout = 0;
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quit = true;
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if (virDomainBlockJobAbort(dom, path, abort_flags) < 0) {
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vshError(ctl, _("failed to abort job for disk %s"), path);
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goto cleanup;
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}
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if (abort_flags & VIR_DOMAIN_BLOCK_JOB_ABORT_ASYNC)
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break;
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} else {
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usleep(500 * 1000);
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}
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}
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if (verbose && !quit) {
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/* printf [100 %] */
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print_job_progress(_("Block Pull"), 0, 1);
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}
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vshPrint(ctl, "\n%s", quit ? _("Pull aborted") : _("Pull complete"));
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ret = true;
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cleanup:
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if (dom)
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virDomainFree(dom);
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if (blocking)
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sigaction(SIGINT, &old_sig_action, NULL);
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return ret;
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}
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/*
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@ -7641,7 +7751,7 @@ cmdBlockJob(vshControl *ctl, const vshCmd *cmd)
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else
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mode = VSH_CMD_BLOCK_JOB_INFO;
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ret = blockJobImpl(ctl, cmd, &info, mode);
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ret = blockJobImpl(ctl, cmd, &info, mode, NULL);
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if (ret < 0)
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return false;
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@ -640,6 +640,7 @@ address of virtual interface (such as I<detach-interface> or
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I<domif-setlink>) will accept the MAC address printed by this command.
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=item B<blockpull> I<domain> I<path> [I<bandwidth>] [I<base>]
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[I<--wait> [I<--verbose>] [I<--timeout> B<seconds>] [I<--async]]
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Populate a disk from its backing image chain. By default, this command
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flattens the entire chain; but if I<base> is specified, containing the
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@ -647,8 +648,17 @@ name of one of the backing files in the chain, then that file becomes
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the new backing file and only the intermediate portion of the chain is
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pulled. Once all requested data from the backing image chain has been
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pulled, the disk no longer depends on that portion of the backing chain.
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It pulls data for the entire disk in the background, the process of the
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operation can be checked with B<blockjob>.
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By default, this command returns as soon as possible, and data for
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the entire disk is pulled in the background; the progress of the
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operation can be checked with B<blockjob>. However, if I<--wait> is
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specified, then this command will block until the operation completes,
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or cancel the operation if the optional I<timeout> in seconds elapses
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or SIGINT is sent (usually with C<Ctrl-C>). Using I<--verbose> along
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with I<--wait> will produce periodic status updates. If job cancellation
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is triggered, I<--async> will return control to the user as fast as
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possible, otherwise the command may continue to block a little while
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longer until the job is done cleaning up.
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I<path> specifies fully-qualified path of the disk; it corresponds
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to a unique target name (<target dev='name'/>) or source file (<source
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