Обсуждение: Bug in writeTimeLineHistory

Hi,

--------------
    if (recoveryTarget == RECOVERY_TARGET_XID)
        snprintf(buffer, sizeof(buffer),
                 "%s%u\t%s\t%s transaction %u\n",
                 (srcfd < 0) ? "" : "\n",
                 parentTLI,
                 xlogfname,
                 recoveryStopAfter ? "after" : "before",
                 recoveryStopXid);
    if (recoveryTarget == RECOVERY_TARGET_TIME)
        snprintf(buffer, sizeof(buffer),
                 "%s%u\t%s\t%s %s\n",
                 (srcfd < 0) ? "" : "\n",
                 parentTLI,
                 xlogfname,
                 recoveryStopAfter ? "after" : "before",
                 timestamptz_to_str(recoveryStopTime));
    else
        snprintf(buffer, sizeof(buffer),
                 "%s%u\t%s\tno recovery target specified\n",
                 (srcfd < 0) ? "" : "\n",
                 parentTLI,
                 xlogfname);
--------------

In writeTimeLineHistory, the result of the above first snprintf is always
overwritten by the following snprintf wrongly. I guess we forgot putting
"else" in the second "if" statement. I attached the very simple patch.

Since this bug was introduced in v9.0, the patch needs to be backported
to 9.0.

Regards,

--
Fujii Masao
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center

Agreed, committed and backpatched.

On Thu, 2010-10-14 at 14:11 +0900, Fujii Masao wrote:
> Hi,
> 
> --------------
>     if (recoveryTarget == RECOVERY_TARGET_XID)
>         snprintf(buffer, sizeof(buffer),
>                  "%s%u\t%s\t%s transaction %u\n",
>                  (srcfd < 0) ? "" : "\n",
>                  parentTLI,
>                  xlogfname,
>                  recoveryStopAfter ? "after" : "before",
>                  recoveryStopXid);
>     if (recoveryTarget == RECOVERY_TARGET_TIME)
>         snprintf(buffer, sizeof(buffer),
>                  "%s%u\t%s\t%s %s\n",
>                  (srcfd < 0) ? "" : "\n",
>                  parentTLI,
>                  xlogfname,
>                  recoveryStopAfter ? "after" : "before",
>                  timestamptz_to_str(recoveryStopTime));
>     else
>         snprintf(buffer, sizeof(buffer),
>                  "%s%u\t%s\tno recovery target specified\n",
>                  (srcfd < 0) ? "" : "\n",
>                  parentTLI,
>                  xlogfname);
> --------------
> 
> In writeTimeLineHistory, the result of the above first snprintf is always
> overwritten by the following snprintf wrongly. I guess we forgot putting
> "else" in the second "if" statement. I attached the very simple patch.
> 
> Since this bug was introduced in v9.0, the patch needs to be backported
> to 9.0.
> 
> Regards,
> 

-- Simon Riggs           www.2ndQuadrant.comPostgreSQL Development, 24x7 Support, Training and Services