watchfrr: build in defaults for -r/-s/-k

There's no good reason to not have these options default to the
installation path of tools/watchfrr.sh.  Doing so allows us to ditch
watchfrr_options from daemons/daemons.conf completely.

Fixes: #3652
Signed-off-by: David Lamparter <equinox@diac24.net>

configure.ac

@@ -2157,6 +2157,7 @@ AC_SUBST([CFG_LIBYANG_PLUGINS])
 AC_DEFINE_UNQUOTED([MODULE_PATH], ["$CFG_MODULE"], [path to modules])
 AC_DEFINE_UNQUOTED([YANG_MODELS_PATH], ["$CFG_YANGMODELS"], [path to YANG data models])
 AC_DEFINE_UNQUOTED([LIBYANG_PLUGINS_PATH], ["$CFG_LIBYANG_PLUGINS"], [path to libyang plugins])
+AC_DEFINE_UNQUOTED([WATCHFRR_SH_PATH], ["${CFG_SBIN%/}/watchfrr.sh"], [path to watchfrr.sh])
 
 dnl ------------------------------------
 dnl Enable RPKI and add librtr to libs

tools/etc/frr/daemons

@@ -55,7 +55,7 @@ bfdd_options="   -A 127.0.0.1"
 fabricd_options="-A 127.0.0.1"
 
 # The list of daemons to watch is automatically generated by the init script.
-watchfrr_options="-r '/usr/lib/frr/watchfrr.sh restart %s' -s '/usr/lib/frr/watchfrr.sh start %s' -k '/usr/lib/frr/watchfrr.sh stop %s'"
+#watchfrr_options=""
 
 # for debugging purposes, you can specify a "wrap" command to start instead
 # of starting the daemon directly, e.g. to use valgrind on ospfd:

tools/frrcommon.sh.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 #
 # This is a "library" of sorts for use by the other FRR shell scripts.  It
 # has most of the daemon start/stop logic, but expects the following shell
@@ -288,6 +288,13 @@ load_old_config "$C_PATH/daemons.conf"
 load_old_config "/etc/default/frr"
 load_old_config "/etc/sysconfig/frr"
 
+if declare -p watchfrr_options | grep -q '^declare \-a'; then
+	log_warning_msg "watchfrr_options contains a bash array value." \
+		"The configured value is intentionally ignored since it is likely wrong." \
+		"Please remove or fix the setting."
+	unset watchfrr_options
+fi
+
 #
 # other defaults and dispatch
 #

tools/frrinit.sh.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 #
 ### BEGIN INIT INFO
 # Provides: frr

tools/watchfrr.sh.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 #
 # This is NOT the init script!  This is the watchfrr start/stop/restart
 # command handler, passed to watchfrr with the -s/-r/-k commands.  It is used

watchfrr/watchfrr.c

@@ -53,6 +53,10 @@
 #define DEFAULT_MIN_RESTART	60
 #define DEFAULT_MAX_RESTART	600
 
+#define DEFAULT_RESTART_CMD	WATCHFRR_SH_PATH " restart %s"
+#define DEFAULT_START_CMD	WATCHFRR_SH_PATH " start %s"
+#define DEFAULT_STOP_CMD	WATCHFRR_SH_PATH " stop %s"
+
 #define PING_TOKEN	"PING"
 
 DEFINE_MGROUP(WATCHFRR, "watchfrr")
@@ -124,6 +128,9 @@ static struct global_state {
 	.loglevel = DEFAULT_LOGLEVEL,
 	.min_restart_interval = DEFAULT_MIN_RESTART,
 	.max_restart_interval = DEFAULT_MAX_RESTART,
+	.restart_command = DEFAULT_RESTART_CMD,
+	.start_command = DEFAULT_START_CMD,
+	.stop_command = DEFAULT_STOP_CMD,
 };
 
 typedef enum {
@@ -227,14 +234,17 @@ Otherwise, the interval is doubled (but capped at the -M value).\n\n",
 -r, --restart	Supply a Bourne shell command to use to restart a single\n\
 		daemon.  The command string should include '%%s' where the\n\
 		name of the daemon should be substituted.\n\
+		(default: '%s')\n\
 -s, --start-command\n\
 		Supply a Bourne shell to command to use to start a single\n\
 		daemon.  The command string should include '%%s' where the\n\
 		name of the daemon should be substituted.\n\
+		(default: '%s')\n\
 -k, --kill-command\n\
 		Supply a Bourne shell to command to use to stop a single\n\
 		daemon.  The command string should include '%%s' where the\n\
 		name of the daemon should be substituted.\n\
+		(default: '%s')\n\
     --dry	Do not start or restart anything, just log.\n\
 -p, --pid-file	Set process identifier file name\n\
 		(default is %s/watchfrr.pid).\n\
@@ -247,7 +257,9 @@ Otherwise, the interval is doubled (but capped at the -M value).\n\n",
 -h, --help	Display this help and exit\n",
 		frr_vtydir, DEFAULT_LOGLEVEL, LOG_EMERG, LOG_DEBUG, LOG_DEBUG,
 		DEFAULT_MIN_RESTART, DEFAULT_MAX_RESTART, DEFAULT_PERIOD,
-		DEFAULT_TIMEOUT, DEFAULT_RESTART_TIMEOUT, frr_vtydir);
+		DEFAULT_TIMEOUT, DEFAULT_RESTART_TIMEOUT,
+		DEFAULT_RESTART_CMD, DEFAULT_START_CMD, DEFAULT_STOP_CMD,
+		frr_vtydir);
 }
 
 static pid_t run_background(char *shell_cmd)