From c91c95e66c50b590fbc0d4b7b464c56978100596 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Wed, 13 Oct 2021 13:06:03 +0200
Subject: [PATCH] core: allow "off" as special watchdog time to be specified

Right now we already understand "default" as special string for enabling
the watchdog but not reconfiguring its timeout (it is internally mapped
to USEC_MAX). To be systematic this adds "off" as special string for
disabling the watchdog logic (it is internally mapped to 0, which is how
this behaviour was previously requested).
---
 src/core/load-fragment.c | 14 ++++++++------
 src/core/main.c          |  2 ++
 src/core/system.conf.in  |  4 ++--
 3 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/src/core/load-fragment.c b/src/core/load-fragment.c
index 7c844a29df9..18d9bb377c7 100644
--- a/src/core/load-fragment.c
+++ b/src/core/load-fragment.c
@@ -6347,6 +6347,8 @@ int config_parse_watchdog_sec(
                 void *data,
                 void *userdata) {
 
+        usec_t *usec = data;
+
         assert(filename);
         assert(lvalue);
         assert(rvalue);
@@ -6354,12 +6356,12 @@ int config_parse_watchdog_sec(
         /* This is called for {Runtime,Reboot,KExec}WatchdogSec= where "default" maps to
          * USEC_INFINITY internally. */
 
-        if (streq(rvalue, "default")) {
-                usec_t *usec = data;
-
+        if (streq(rvalue, "default"))
                 *usec = USEC_INFINITY;
-                return 0;
-        }
+        else if (streq(rvalue, "off"))
+                *usec = 0;
+        else
+                return config_parse_sec(unit, filename, line, section, section_line, lvalue, ltype, rvalue, data, userdata);
 
-        return config_parse_sec(unit, filename, line, section, section_line, lvalue, ltype, rvalue, data, userdata);
+        return 0;
 }
diff --git a/src/core/main.c b/src/core/main.c
index 4b8e923a1e0..6e01398523c 100644
--- a/src/core/main.c
+++ b/src/core/main.c
@@ -544,6 +544,8 @@ static int parse_proc_cmdline_item(const char *key, const char *value, void *dat
 
                 if (streq(value, "default"))
                         arg_runtime_watchdog = USEC_INFINITY;
+                else if (streq(value, "off"))
+                        arg_runtime_watchdog = 0;
                 else {
                         r = parse_sec(value, &arg_runtime_watchdog);
                         if (r < 0) {
diff --git a/src/core/system.conf.in b/src/core/system.conf.in
index e88280bd0a7..96fb64d2c1e 100644
--- a/src/core/system.conf.in
+++ b/src/core/system.conf.in
@@ -29,9 +29,9 @@
 #CPUAffinity=
 #NUMAPolicy=default
 #NUMAMask=
-#RuntimeWatchdogSec=0
+#RuntimeWatchdogSec=off
 #RebootWatchdogSec=10min
-#KExecWatchdogSec=0
+#KExecWatchdogSec=off
 #WatchdogDevice=
 #CapabilityBoundingSet=
 #NoNewPrivileges=no
-- 
2.47.3