Re: [ndctl PATCH 2/4] ndctl, monitor: set default log destination to syslog if "--daemon" is specified

[Masayoshi Mizuma <msys.mizuma@gmail.com>]

Hi Qi,

On 08/07/2018 09:17 AM, QI Fuli wrote:
> When running monitor as a daemon, if the log destination is "standard" or
> a relative path for log file, the messages will not be able to be logged.
> Sometimes, users may not notice that the default log destination is "standard"
> when they start monitor daemon by systemctl, so they will lose messages.
> This patch is used to fix the unfriendly interface. When running monitor as a
> daemon, the default log destination will be changed to syslog. Also, the messages
> will be forwarded to syslog if the log destination is a relative path for log file.
> 
> Signed-off-by: QI Fuli <qi.fuli@jp.fujitsu.com>
> ---
>  Documentation/ndctl/ndctl-monitor.txt | 16 +++++++++++++++-
>  ndctl/monitor.c                       |  5 ++++-
>  ndctl/monitor.conf                    |  2 ++
>  3 files changed, 21 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/ndctl/ndctl-monitor.txt b/Documentation/ndctl/ndctl-monitor.txt
> index 1cba9ea..9a8d76b 100644
> --- a/Documentation/ndctl/ndctl-monitor.txt
> +++ b/Documentation/ndctl/ndctl-monitor.txt
> @@ -67,7 +67,21 @@ OPTIONS
>  
>  -l <file | syslog | standard>::
>  --log=<file | syslog | standard>::
> -	Output notifications to <file>, syslog or standard output.
> +	Send log messages to the specified destination.
> ++
> +--
> +<file>::
> +	Send log messages to specified <file>. When fopen() is not able
> +	to open <file>, log messages will be forwarded to syslog.
> +syslog::
> +	Send messages to syslog.
> +standard::
> +	Send messages to standard output.
> +--
> ++
> +The default log destination is 'syslog' if "--daemon" is specified,
> +otherwise 'standard'. Note that standard and relative path for <file>
> +will not work if "--daemon" is specified.
>  
>  -c::
>  --config-file=::
> diff --git a/ndctl/monitor.c b/ndctl/monitor.c
> index bf1f1d3..2f3d751 100644
> --- a/ndctl/monitor.c
> +++ b/ndctl/monitor.c
> @@ -93,7 +93,8 @@ static void log_file(struct ndctl_ctx *ctx, int priority, const char *file,
>  	f = fopen(monitor.log, "a+");
>  	if (!f) {
>  		ndctl_set_log_fn(ctx, log_syslog);
> -		err(ctx, "open logfile %s failed\n", monitor.log);
> +		err(ctx, "open logfile %s failed, forward messages to syslog\n",
> +				monitor.log);
>  		did_fail = 1;
>  		notice(ctx, "%s\n", buf);
>  		goto end;
> @@ -644,6 +645,8 @@ int cmd_monitor(int argc, const char **argv, void *ctx)
>  	}
>  
>  	if (monitor.daemon) {

Why don't you add './standard' check? Like as:

                if (strncmp(monitor.log, "./standard", 10) == 0)
                        error("daemon doesn't work for 'standard' log option");
                        goto out;

Thanks,
Masa

> +		if (!monitor.log || strncmp(monitor.log, "./", 2) == 0)
> +			ndctl_set_log_fn((struct ndctl_ctx *)ctx, log_syslog);

>  		if (daemon(0, 0) != 0) {
>  			err((struct ndctl_ctx *)ctx, "daemon start failed\n");
>  			goto out;
> diff --git a/ndctl/monitor.conf b/ndctl/monitor.conf
> index 857aadf..934e2c0 100644
> --- a/ndctl/monitor.conf
> +++ b/ndctl/monitor.conf
> @@ -38,4 +38,6 @@
>  # to standard output (log=standard) or to write into a special file (log=<file>)
>  # by setting key "log". If this value is in conflict with the value of
>  # [--log=<value>] option, this value will be ignored.
> +# Note: Setting value to "standard" or relative path for <file> will not work
> +# when running moniotr as a daemon.
>  # log = /var/log/ndctl/monitor.log
> 
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