Switch from PTY to pipe for service log redirection

The PTY approach caused isatty() to return true for services using
the log directive, triggering programs like fprintd (using glib) to
emit ANSI escape codes and other TTY-specific formatting in syslog.

Using a standard pipe ensures isatty() correctly returns false, so
programs produce plain text output suitable for logging.

For services that require line-buffered output, users can wrap the
command with `stdbuf -oL` as documented in doc/config/logging.md.

Fixes #455

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

doc/config/logging.md

@@ -39,3 +39,25 @@ Log rotation is controlled using the global `log` setting.
 **Example:**
 
     service log:prio:user.warn,tag:ntpd /sbin/ntpd pool.ntp.org -- NTP daemon
+
+Output Buffering
+----------------
+
+When using the `log` directive, Finit redirects the service's stdout and
+stderr to a pipe connected to a logger process.  Programs detect this as
+non-interactive output (i.e., `isatty()` returns false) and typically
+switch from line-buffered to fully-buffered mode.
+
+Most well-behaved daemons explicitly flush their output or use syslog
+directly, so this is rarely an issue.  However, if a service's log
+messages appear delayed or batched, you can force line-buffered output
+by wrapping the command with `stdbuf`:
+
+    service log /usr/bin/stdbuf -oL /path/to/command -- My service
+
+The `-oL` option forces line-buffered output, and `-o0` forces unbuffered
+output.  See `stdbuf(1)` for details.
+
+> [!NOTE]
+> Using `stdbuf` is rarely necessary. Only use it if you observe actual
+> buffering issues with a specific service.

doc/config/runlevels.md

@@ -165,4 +165,22 @@ sync(2) has been called, twice.
 
 > "On Linux, sync is only guaranteed to schedule the dirty blocks for
 > writing; it can actually take a short time before all the blocks are
-> finally written.
+> finally written.
+
+**Syntax:** `reboot-watchdog <on|off|true|false|1|0>`
+
+Controls whether the system should reboot via the watchdog timer (WDT)
+or directly via the SoC/kernel.  When enabled, Finit will:
+
+ 1. Send `SIGPWR` to the registered watchdog daemon before shutdown
+ 2. Send `SIGTERM` to the watchdog daemon and wait up to 10 seconds
+    for the watchdog to trigger a hardware reset
+
+When disabled (default), Finit skips the watchdog reboot logic and
+calls the kernel's `reboot(2)` syscall directly for a clean SoC reboot.
+
+*Default:* off (reboot via SoC)
+
+> [!NOTE]
+> This setting only affects reboots.  The watchdog daemon will still
+> run and monitor the system during normal operation.

doc/watchdog.md

@@ -10,14 +10,21 @@ many embedded systems this is crucial to ensure all circuits on the
 board are properly reset for the next boot, in effect ensuring the
 system works the same after both a power-on and reboot event.
 
+> [!NOTE]
+> The watchdog reboot delegation can be enabled with the `reboot-watchdog`
+> configuration option in `/etc/finit.conf`.  By default this is disabled
+> and the system reboots directly via the SoC using the kernel's `reboot(2)`
+> syscall.  See [Runlevels](config/runlevels.md) for details.
+
 The delegation is performed at the very last steps of system shutdown,
-if reboot has been selected and an elected watchdog is known, first a
-`SIGPWR` is sent to advise watchdogd of the pending reboot.  Then, when
-the necessary steps of preparing the system for shutdown (umount etc.)
-are completed, Finit sends `SIGTERM` to watchdogd and puts itself in a
-10 sec timeout loop waiting for the WDT to reset the board.  If a reset
-is not done before the timeout, Finit falls back to`reboot(RB_AUTOBOOT)`
-which tells the kernel to do the reboot.
+if reboot has been selected, `reboot-watchdog` is enabled, and an elected
+watchdog is known.  First a `SIGPWR` is sent to advise watchdogd of the
+pending reboot.  Then, when the necessary steps of preparing the system
+for shutdown (umount etc.) are completed, Finit sends `SIGTERM` to
+watchdogd and puts itself in a 10 sec timeout loop waiting for the WDT
+to reset the board.  If a reset is not done before the timeout, Finit
+falls back to `reboot(RB_AUTOBOOT)` which tells the kernel to do the
+reboot.
 
 An external watchdog service can also be used.  The more advanced cousin
 [watchdogd](https://github.com/troglobit/watchdogd/) is the recommended

src/api.c

@@ -68,7 +68,8 @@ static int stop(svc_t *svc, void *user_data)
 	service_timeout_cancel(svc);
 	svc_stop(svc);
 	service_step(svc);
-	service_step_all(SVC_TYPE_ANY);
+	if (!IS_RESERVED_RUNLEVEL(runlevel))
+		service_step_all(SVC_TYPE_ANY);
 
 	return 0;
 }
@@ -83,7 +84,8 @@ static int start(svc_t *svc, void *user_data)
 	service_timeout_cancel(svc);
 	svc_start(svc);
 	service_step(svc);
-	service_step_all(SVC_TYPE_ANY);
+	if (!IS_RESERVED_RUNLEVEL(runlevel))
+		service_step_all(SVC_TYPE_ANY);
 
 	return 0;
 }
@@ -391,11 +393,6 @@ static void api_cb(uev_t *w, void *arg, int events)
 		}
 
 		switch (rq.cmd) {
-		case INIT_CMD_RELOAD:
-		case INIT_CMD_START_SVC:
-		case INIT_CMD_RESTART_SVC:
-		case INIT_CMD_STOP_SVC:
-		case INIT_CMD_RELOAD_SVC:
 		case INIT_CMD_REBOOT:
 		case INIT_CMD_HALT:
 		case INIT_CMD_POWEROFF:
@@ -453,6 +450,10 @@ static void api_cb(uev_t *w, void *arg, int events)
 			break;
 
 		case INIT_CMD_RELOAD: /* 'init q' and 'initctl reload' */
+			if (IS_RESERVED_RUNLEVEL(runlevel)) {
+				warnx("Ignoring reload in runlevel S and 6/0.");
+				goto done;
+			}
 			dbg("reload");
 			sm_reload();
 			break;
@@ -576,7 +577,7 @@ static void api_cb(uev_t *w, void *arg, int events)
 			dbg("Unsupported cmd: %d", rq.cmd);
 			break;
 		}
-
+	done:
 		if (result)
 			rq.cmd = INIT_CMD_NACK;
 		else

src/conf.c

@@ -60,6 +60,7 @@ int   single    = 0;		/* single user mode from kernel cmdline */
 int   bootstrap = 1;		/* set while bootstrapping (for TTYs) */
 int   kerndebug = 0;		/* set if /proc/sys/kernel/printk > 7 */
 int   syncsec   = 0;		/* reboot delay */
+int   wdtreboot = 0;		/* reboot via watchdog, default: SOC */
 int   readiness = SVC_NOTIFY_PID;
 char *finit_conf= NULL;
 char *finit_rcsd= NULL;
@@ -1034,6 +1035,11 @@ static int parse_static(char *line, int is_rcsd)
 		return 0;
 	}
 
+	if (MATCH_CMD(line, "reboot-watchdog ", x)) {
+		wdtreboot = get_bool(strip_line(x), 0);
+		return 0;
+	}
+
 	/*
 	 * Periodic check and instability index leveler, seconds
 	 */

src/conf.h

@@ -37,6 +37,7 @@ extern int   single;
 extern int   bootstrap;
 extern int   kerndebug;
 extern int   syncsec;
+extern int   wdtreboot;
 extern int   readiness;
 extern char *fstab;
 extern char *sdown;

src/finit.c

@@ -212,6 +212,11 @@ static int fsck(int pass)
 		if (mnt->mnt_passno == 0 || mnt->mnt_passno != pass)
 			continue;
 
+		if (hasmntopt(mnt, "noauto")) {
+			dbg("Skipping fsck of %s, marked noauto", mnt->mnt_fsname);
+			continue;
+		}
+
 		/* Device to maybe fsck,  */
 		dev = mnt->mnt_fsname;
 
@@ -425,6 +430,11 @@ static void fs_swapon(char *cmd, size_t len)
 		if (strcmp(mnt->mnt_type, MNTTYPE_SWAP))
 			continue;
 
+		if (hasmntopt(mnt, "noauto")) {
+			dbg("Skipping swap %s, marked noauto", mnt->mnt_fsname);
+			continue;
+		}
+
 		snprintf(cmd, len, "swapon %s", mnt->mnt_fsname);
 		run_interactive(cmd, "Enabling swap %s", mnt->mnt_fsname);
 	}

src/service.c

@@ -271,25 +271,22 @@ static int lredirect(svc_t *svc)
 {
 	static int have_sysklogd = -1;
 	pid_t svc_pid = getpid();
+	int pipefd[2];
 	pid_t pid;
 	int fd;
 
 	/*
-	 * Open PTY to connect to logger.  A pty isn't buffered
-	 * like a pipe, and it eats newlines so they aren't logged
+	 * Use a pipe to connect to logger.  This ensures isatty()
+	 * returns false for the service, preventing programs from
+	 * emitting ANSI escape codes and other TTY-specific output.
 	 */
-	fd = posix_openpt(O_RDWR);
-	if (fd == -1) {
-		dbg("Failed posix_openpt(), errno %d: %s", errno, strerror(errno));
-		svc->log.enabled = 0;
-		return -1;
-	}
-	if (grantpt(fd) == -1 || unlockpt(fd) == -1) {
-		dbg("Failed grantpt()|unlockpt(), errno %d: %s", errno, strerror(errno));
-		close(fd);
+	if (pipe(pipefd) == -1) {
+		dbg("Failed pipe(), errno %d: %s", errno, strerror(errno));
 		svc->log.enabled = 0;
+
 		return -1;
 	}
+	fd = pipefd[1];  /* Write end for service */
 
 	/*
 	 * First time, check if we have sysklogd logger tool.
@@ -319,17 +316,12 @@ static int lredirect(svc_t *svc)
 		char *prio = "daemon.info";
 		char buf[MAX_IDENT_LEN];
 		char *tag;
-		int fds;
 
 		sched_yield();
 
-		fds = open(ptsname(fd), O_RDONLY);
-		close(fd);
-		if (fds == -1) {
-			logit(LOG_WARNING, "failed open() ptsname(%d), errno %d", fd, errno);
-			_exit(0);
-		}
-		dup2(fds, STDIN_FILENO);
+		close(pipefd[1]);  /* Close write end in logger */
+		dup2(pipefd[0], STDIN_FILENO);
+		close(pipefd[0]);
 
 		/* Reset signals */
 		sig_unblock();
@@ -385,10 +377,11 @@ static int lredirect(svc_t *svc)
 		_exit(1);
 	}
 
-	dup2(fd, STDOUT_FILENO);
-	dup2(fd, STDERR_FILENO);
+	close(pipefd[0]);  /* Close read end in service */
+	dup2(pipefd[1], STDOUT_FILENO);
+	dup2(pipefd[1], STDERR_FILENO);
 
-	return close(fd);
+	return close(pipefd[1]);
 }
 
 /*
@@ -3053,6 +3046,42 @@ int service_completed(svc_t **svcp)
 	return 1;
 }
 
+/*
+ * service_log_incomplete - Log all incomplete run/task in current runlevel
+ *
+ * Iterates through all run/task services and logs those that have not
+ * yet completed. Useful for diagnosing bootstrap delays or reporting
+ * what was skipped when user interrupts bootstrap wait.
+ */
+void service_log_incomplete(void)
+{
+	svc_t *svc, *iter = NULL;
+	int count = 0;
+
+	for (svc = svc_iterator(&iter, 1); svc; svc = svc_iterator(&iter, 0)) {
+		if (!svc_is_runtask(svc))
+			continue;
+
+		if (!svc_enabled(svc))
+			continue;
+
+		if (svc_conflicts(svc))
+			continue;
+
+		if (strstr(svc->cond, plugin_hook_str(HOOK_SVC_UP)) ||
+		    strstr(svc->cond, plugin_hook_str(HOOK_SYSTEM_UP)))
+			continue;
+
+		if (!svc->once) {
+			logit(LOG_WARNING, "Incomplete: %s", svc_ident(svc, NULL, 0));
+			count++;
+		}
+	}
+
+	if (count == 0)
+		logit(LOG_WARNING, "No incomplete run/task services found");
+}
+
 /*
  * Called in SM_RELOAD_WAIT_STATE to update unmodified non-native
  * services' READY condition to the current generation.  Similar

src/service.h

@@ -48,6 +48,7 @@ void      service_step_all       (int types);
 void      service_worker         (void *unused);
 
 int       service_completed      (svc_t **svc);
+void      service_log_incomplete (void);
 void      service_notify_reconf  (void);
 
 void      service_init           (uev_ctx_t *ctx);

src/sig.c

@@ -187,6 +187,11 @@ static void fs_swapoff(void)
 		if (strcmp(mnt->mnt_type, MNTTYPE_SWAP))
 			continue;
 
+		if (hasmntopt(mnt, "noauto")) {
+			dbg("Skipping swap %s, marked noauto", mnt->mnt_fsname);
+			continue;
+		}
+
 		snprintf(cmd, sizeof(cmd), "swapoff %s", mnt->mnt_fsname);
 		run_interactive(cmd, "Disabling swap %s", mnt->mnt_fsname);
 	}
@@ -353,7 +358,7 @@ void do_shutdown(shutop_t op)
 		return;
 	}
 
-	if (wdog) {
+	if (wdtreboot && wdog) {
 		print(kill(wdog->pid, SIGPWR) == 1, "Advising watchdog, system going down");
 		do_sleep(2);
 	}
@@ -400,17 +405,17 @@ void do_shutdown(shutop_t op)
 
 	/* Reboot via watchdog or kernel, or shutdown? */
 	if (op == SHUT_REBOOT) {
-		print(0, "Rebooting ...");
-		if (wdog && wdog->pid > 1) {
+		if (wdtreboot && wdog && wdog->pid > 1) {
 			int timeout = 10;
 
 			/* Wait here until the WDT reboots, or timeout with fallback */
+			print(0, "Rebooting using WDT, please wait ...");
 			print(kill(wdog->pid, SIGTERM) == 1, "Pending watchdog reboot");
 			while (timeout--)
 				do_sleep(1);
 		}
 
-		dbg("Rebooting ...");
+		print(0, "Rebooting ...");
 		reboot(RB_AUTOBOOT);
 	} else if (op == SHUT_OFF) {
 		print(0, "Powering down ...");

src/sm.c

@@ -23,8 +23,10 @@
 
 #include "config.h"		/* Generated by configure script */
 
+#include <fcntl.h>
 #include <paths.h>
 #include <sys/types.h>
+#include <termios.h>
 
 #include "finit.h"
 #include "cond.h"
@@ -56,8 +58,80 @@ static struct {
 	int        newlevel;      /* Set to new runlevel on change, -1 otherwise */
 	int        reload;        /* Set on reload event, else 0  */
 	int        in_reload;   /* Set when waiting for all processes to be halted */
+	int        skip_bootstrap; /* Set to skip bootstrap waiting */
 } sm;
 
+static uev_t console_watcher;
+static int console_fd = -1;
+
+/*
+ * Console input callback - handles Ctrl-C during bootstrap wait
+ */
+static void console_input_cb(uev_t *w, void *arg, int events)
+{
+	ssize_t len;
+	char ch;
+
+	(void)arg;
+
+	if (UEV_ERROR == events) {
+		warnx("Error in console watcher");
+		return;
+	}
+
+	/* Read and check for Ctrl-C (ASCII 3) */
+	len = read(w->fd, &ch, 1);
+	if (len == 1 && ch == 3) {  /* Ctrl-C */
+		sm.skip_bootstrap = 1;
+		print(2, "Bootstrap wait interrupted by Ctrl-C, resuming ...");
+	}
+}
+
+/*
+ * Stop and cleanup the console watcher
+ */
+static void console_watcher_stop(void)
+{
+	if (console_fd >= 0) {
+		uev_io_stop(&console_watcher);
+		close(console_fd);
+		console_fd = -1;
+	}
+}
+
+/*
+ * Setup console watcher for Ctrl-C during bootstrap
+ */
+static void console_watcher_start(uev_ctx_t *ctx)
+{
+	struct termios tio;
+
+	/* Open console in non-blocking mode */
+	console_fd = open(console(), O_RDONLY | O_NONBLOCK);
+	if (console_fd < 0) {
+		dbg("Failed opening console for input monitoring: %s", strerror(errno));
+		return;
+	}
+
+	/* Get current terminal settings */
+	if (tcgetattr(console_fd, &tio) == 0) {
+		/* Put terminal in raw mode to catch Ctrl-C */
+		tio.c_lflag &= ~(ICANON | ECHO | ISIG);
+		tio.c_cc[VMIN] = 0;
+		tio.c_cc[VTIME] = 0;
+		tcsetattr(console_fd, TCSANOW, &tio);
+	}
+
+	/* Register I/O watcher */
+	if (uev_io_init(ctx, &console_watcher, console_input_cb, NULL, console_fd, UEV_READ)) {
+		dbg("Failed setting up console watcher");
+		close(console_fd);
+		console_fd = -1;
+	} else {
+		dbg("Console watcher active, press Ctrl-C to skip bootstrap wait");
+	}
+}
+
 
 /*
  * Wait for system bootstrap to complete, all SVC_TYPE_RUNTASK must be
@@ -76,13 +150,19 @@ static void sm_check_bootstrap(void *work)
 	service_step_all(SVC_TYPE_ANY);
 
 	bootstrap_done = service_completed(&svc);
-	if (timeout-- > 0 && !bootstrap_done) {
+	if (timeout-- > 0 && !bootstrap_done && !sm.skip_bootstrap) {
 		dbg("Not all bootstrap run/tasks have completed yet ... %d", timeout);
 		schedule_work(work);
 		return;
 	}
 
-	if (timeout > 0) {
+	/* Stop console watcher before proceeding */
+	console_watcher_stop();
+
+	if (sm.skip_bootstrap) {
+		logit(LOG_WARNING, "Ctrl-C received, skipped waiting for the following:");
+		service_log_incomplete();
+	} else if (timeout > 0) {
 		dbg("All run/task have completed, resuming bootstrap.");
 	} else {
 		dbg("Timeout, resuming bootstrap.");
@@ -184,6 +264,7 @@ void sm_init(void)
 	sm.newlevel = -1;
 	sm.reload = 0;
 	sm.in_reload = 0;
+	sm.skip_bootstrap = 0;
 
 	dbg("Starting bootstrap finalize timer ...");
 	schedule_work(&work);
@@ -206,6 +287,7 @@ restart:
 		service_step_all(SVC_TYPE_RUNTASK | SVC_TYPE_SERVICE | SVC_TYPE_SYSV);
 
 		sm.state = SM_BOOTSTRAP_WAIT_STATE;
+		console_watcher_start(ctx);
 		break;
 
 	/*
@@ -229,6 +311,9 @@ restart:
 		if (sm.newlevel == -1)
 			break;
 
+		/* Ensure console watcher is stopped before proceeding */
+		console_watcher_stop();
+
 		/* Hooks that should run at the very end */
 		dbg("Calling all system up hooks ...");
 		plugin_run_hooks(HOOK_SYSTEM_UP);