Re: [PATCH v2 1/6] conf, passt: Don't try to log to stderr after we close it

[David Gibson <david@gibson.dropbear.id.au>]

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On Tue, Jun 18, 2024 at 09:14:22AM +0200, Stefano Brivio wrote:
> If we don't run in foreground, we close standard error as we
> daemonise, so it makes no sense to check if the controlling terminal
> is an interactive terminal or if --force-stderr was given, to decide
> if we want to log to standard error.
> 
> Make --force-stderr depend on --foreground.
> 
> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
> ---
>  conf.c  | 3 +++
>  passt.c | 2 +-
>  2 files changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/conf.c b/conf.c
> index 94b3ed6..dbdbb62 100644
> --- a/conf.c
> +++ b/conf.c
> @@ -1693,6 +1693,9 @@ void conf(struct ctx *c, int argc, char **argv)
>  
>  	conf_ugid(runas, &uid, &gid);
>  
> +	if (!c->foreground && c->force_stderr)
> +		die("Can't log to standard error if not running in foreground");
> +
>  	if (logfile) {
>  		logfile_init(c->mode == MODE_PASTA ? "pasta" : "passt",
>  			     logfile, logsize);
> diff --git a/passt.c b/passt.c
> index a5e2c5a..aa9648a 100644
> --- a/passt.c
> +++ b/passt.c
> @@ -302,7 +302,7 @@ int main(int argc, char **argv)
>  	if (isolate_prefork(&c))
>  		die("Failed to sandbox process, exiting");
>  
> -	if (!c.force_stderr && !isatty(fileno(stderr)))
> +	if (!c.foreground || (!c.force_stderr && !isatty(fileno(stderr))))
>  		__openlog(log_name, 0, LOG_DAEMON);

Hm.. kind of preexisting, but shouldn't we still skip the __openlog()
if we have a logfile?  Or make __openlog() open either the syslog or
the logfile as appropriate (but in that case we should rename it not
to look like openlog(3)).

>  	if (!c.foreground)

-- 
David Gibson (he or they)	| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you, not the other way
				| around.
http://www.ozlabs.org/~dgibson

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