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Re: [libvirt] [PATCH] qemu: record timestamp in qemu domain log



On Tue, Nov 16, 2010 at 11:39:26PM +0800, Osier Yang wrote:
> Currently only support domain start and shutdown, for domain start,
> record timestamp before the qemu command line, and for domain shutdown,
> just say it's shutting down with timestamp.
> 
> * src/qemu/qemu_driver.c (qemudStartVMDaemon, qemudShutdownVMDaemon
>   introduced two macros - START_POSTFIX, SHUTDOWN_POSTFIX)
> ---
>  src/qemu/qemu_driver.c |   46 ++++++++++++++++++++++++++++++++++++++++++++--
>  1 files changed, 44 insertions(+), 2 deletions(-)
> 
> diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
> index fd61864..3c833d2 100644
> --- a/src/qemu/qemu_driver.c
> +++ b/src/qemu/qemu_driver.c
> @@ -3855,6 +3855,8 @@ static void qemuDomainSecurityLabelAudit(virDomainObjPtr vm, bool success)
>      VIR_FREE(vmname);
>  }
> 
> +#define START_POSTFIX ": starting up\n"
> +#define SHUTDOWN_POSTFIX ": shutting down\n"
> 
>  static int qemudStartVMDaemon(virConnectPtr conn,
>                                struct qemud_driver *driver,
> @@ -3877,6 +3879,7 @@ static int qemudStartVMDaemon(virConnectPtr conn,
>      char ebuf[1024];
>      char *pidfile = NULL;
>      int logfile = -1;
> +    char *timestamp;
>      qemuDomainObjPrivatePtr priv = vm->privateData;
> 
>      struct qemudHookData hookData;
> @@ -4084,7 +4087,21 @@ static int qemudStartVMDaemon(virConnectPtr conn,
>              goto cleanup;
>      }
> 
> +    if ((timestamp = virTimestamp()) == NULL) {
> +        virReportOOMError();
> +        goto cleanup;
> +    } else {
> +        if (safewrite(logfile, timestamp, strlen(timestamp)) < 0 ||
> +            safewrite(logfile, START_POSTFIX, strlen(START_POSTFIX)) < 0) {
> +            VIR_WARN("Unable to write timestamp to logfile: %s",
> +                     virStrerror(errno, ebuf, sizeof ebuf));
> +        }
> +
> +        VIR_FREE(timestamp);
> +    }
> +
>      tmp = progenv;
> +
>      while (*tmp) {
>          if (safewrite(logfile, *tmp, strlen(*tmp)) < 0)
>              VIR_WARN("Unable to write envv to logfile: %s",
> @@ -4233,7 +4250,6 @@ cleanup:
>      return -1;
>  }
> 
> -
>  static void qemudShutdownVMDaemon(struct qemud_driver *driver,
>                                    virDomainObjPtr vm,
>                                    int migrated) {
> @@ -4243,10 +4259,37 @@ static void qemudShutdownVMDaemon(struct qemud_driver *driver,
>      virErrorPtr orig_err;
>      virDomainDefPtr def;
>      int i;
> +    int logfile = -1;
> +    char *timestamp;
> +    char ebuf[1024];
> 
>      VIR_DEBUG("Shutting down VM '%s' pid=%d migrated=%d",
>                vm->def->name, vm->pid, migrated);
> 
> +    if ((logfile = qemudLogFD(driver, vm->def->name)) < 0) {
> +        /* To not break the normal domain shutdown process, skip the
> +         * timestamp log writing if failed on opening log file. */
> +        VIR_WARN("Unable to open logfile: %s",
> +                  virStrerror(errno, ebuf, sizeof ebuf));
> +    } else {
> +        if ((timestamp = virTimestamp()) == NULL) {
> +            virReportOOMError();
> +        } else {
> +            if (safewrite(logfile, timestamp, strlen(timestamp)) < 0 ||
> +                safewrite(logfile, SHUTDOWN_POSTFIX,
> +                          strlen(SHUTDOWN_POSTFIX)) < 0) {
> +                VIR_WARN("Unable to write timestamp to logfile: %s",
> +                         virStrerror(errno, ebuf, sizeof ebuf));
> +            }
> +
> +            VIR_FREE(timestamp);
> +        }
> +
> +        if (VIR_CLOSE(logfile) < 0)
> +             VIR_WARN("Unable to close logfile: %s",
> +                      virStrerror(errno, ebuf, sizeof ebuf));
> +    }
> +
>      /* This method is routinely used in clean up paths. Disable error
>       * reporting so we don't squash a legit error. */
>      orig_err = virSaveLastError();
> @@ -4382,7 +4425,6 @@ retry:
>      }
>  }
> 
> -
>  static virDrvOpenStatus qemudOpen(virConnectPtr conn,
>                                    virConnectAuthPtr auth ATTRIBUTE_UNUSED,
>                                    int flags ATTRIBUTE_UNUSED) {
> --

ACK

Daniel
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