From mboxrd@z Thu Jan 1 00:00:00 1970 Received: by passt.top (Postfix, from userid 1000) id B9D0A5A0052; Thu, 20 Jun 2024 06:08:00 +0200 (CEST) From: Stefano Brivio To: passt-dev@passt.top Subject: [PATCH v4 2/8] conf, passt: Make --stderr do nothing, and deprecate it Date: Thu, 20 Jun 2024 06:07:54 +0200 Message-ID: <20240620040800.3065684-3-sbrivio@redhat.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240620040800.3065684-1-sbrivio@redhat.com> References: <20240620040800.3065684-1-sbrivio@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Message-ID-Hash: HFKUIMYQOM7XDIIYEIXMLJFY3QB7LXWO X-Message-ID-Hash: HFKUIMYQOM7XDIIYEIXMLJFY3QB7LXWO X-MailFrom: sbrivio@passt.top X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: Yalan Zhang , David Gibson X-Mailman-Version: 3.3.8 Precedence: list List-Id: Development discussion and patches for passt Archived-At: Archived-At: List-Archive: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: The original behaviour of printing messages to standard error by default when running from a non-interactive terminal was introduced because the first KubeVirt integration draft used to start passt in foreground and get messages via standard error. For development purposes, the system logger was more convenient at that point, and passt was running from interactive terminals only if not started by the KubeVirt integration. This behaviour was introduced by 84a62b79a2bc ("passt: Also log to stderr, don't fork to background if not interactive"). Later, I added command-line options in 1e49d194d017 ("passt, pasta: Introduce command-line options and port re-mapping") and accidentally reversed this condition, which wasn't a problem as --stderr could force printing to standard error anyway (and it was used by KubeVirt). Nowadays, the KubeVirt integration uses a log file (requested via libvirt configuration), and the same applies for Podman if one actually needs to look at runtime logs. There are no use cases left, as far as I know, where passt runs in foreground in non-interactive terminals. Seize the chance to reintroduce some sanity here. If we fork to background, standard error is closed, so --stderr is useless in that case. If we run in foreground, there's no harm in printing messages to standard error, and that accidentally became the default behaviour anyway, so --stderr is not needed in that case. It would be needed for non-interactive terminals, but there are no use cases, and if there were, let's log to standard error anyway: the user can always redirect standard error to /dev/null if needed. Before we're up and running, we need to print to standard error anyway if something happens, otherwise we can't report failure to start in any kind of usage, stand-alone or in integrations. So, make --stderr do nothing, and deprecate it. While at it, drop a left-over comment about --foreground being the default only for interactive terminals, because it's not the case anymore. Signed-off-by: Stefano Brivio Reviewed-by: David Gibson --- conf.c | 18 ++---------------- passt.1 | 9 +++++---- passt.c | 2 +- passt.h | 2 -- 4 files changed, 8 insertions(+), 23 deletions(-) diff --git a/conf.c b/conf.c index dbdbb62..9f869f5 100644 --- a/conf.c +++ b/conf.c @@ -730,9 +730,7 @@ static void usage(const char *name, FILE *f, int status) " --trace Be extra verbose, implies --debug\n" " -q, --quiet Don't print informational messages\n" " -f, --foreground Don't run in background\n" - " default: run in background if started from a TTY\n" - " -e, --stderr Log to stderr too\n" - " default: log to system logger only if started from a TTY\n" + " default: run in background\n" " -l, --log-file PATH Log (only) to given file\n" " --log-size BYTES Maximum size of log file\n" " default: 1 MiB\n" @@ -1405,18 +1403,9 @@ void conf(struct ctx *c, int argc, char **argv) c->debug = 1; break; case 'e': - if (logfile) - die("Can't log to both file and stderr"); - - if (c->force_stderr) - die("Multiple --stderr options given"); - - c->force_stderr = 1; + warn("--stderr will be dropped soon"); break; case 'l': - if (c->force_stderr) - die("Can't log to both stderr and file"); - if (logfile) die("Multiple --log-file options given"); @@ -1693,9 +1682,6 @@ 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.1 b/passt.1 index 7676fe3..6c8f932 100644 --- a/passt.1 +++ b/passt.1 @@ -93,13 +93,14 @@ Default is to fork into background. .TP .BR \-e ", " \-\-stderr -Log to standard error too. -Default is to log to the system logger only, if started from an interactive -terminal, and to both system logger and standard error otherwise. +This option has no effect, and is maintained for compatibility purposes only. + +Note that this configuration option is \fBdeprecated\fR and will be removed in a +future version. .TP .BR \-l ", " \-\-log-file " " \fIPATH\fR -Log to file \fIPATH\fR, not to standard error, and not to the system logger. +Log to file \fIPATH\fR, and not to the system logger. .TP .BR \-\-log-size " " \fISIZE\fR diff --git a/passt.c b/passt.c index aa9648a..19ecd68 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.foreground || (!c.force_stderr && !isatty(fileno(stderr)))) + if (!c.foreground) __openlog(log_name, 0, LOG_DAEMON); if (!c.foreground) diff --git a/passt.h b/passt.h index 46d073a..21cf4c1 100644 --- a/passt.h +++ b/passt.h @@ -180,7 +180,6 @@ struct ip6_ctx { * @trace: Enable tracing (extra debug) mode * @quiet: Don't print informational messages * @foreground: Run in foreground, don't log to stderr by default - * @force_stderr: Force logging to stderr * @nofile: Maximum number of open files (ulimit -n) * @sock_path: Path for UNIX domain socket * @pcap: Path for packet capture file @@ -231,7 +230,6 @@ struct ctx { int trace; int quiet; int foreground; - int force_stderr; int nofile; char sock_path[UNIX_PATH_MAX]; char pcap[PATH_MAX]; -- 2.43.0