Fix system unit TimeoutStopSec on older version. (elastic#14947)

Fixes the system unit TimeoutStopSec option to set 0 on older version that do not support 'infinity'.
Also handles the upgrade case where the OS may not automatically upgrade the systemd file.

pkg/centos/after-install.sh

@@ -7,5 +7,23 @@ sed -i \
   /etc/logstash/logstash.yml
 chmod 600 /etc/logstash/startup.options
 chmod 600 /etc/default/logstash
+
+# Starting from systemd 229, TimeouStopSec supports using
+# 'infinity' to disable not send a SIG Kill.
+#
+# Older versions need to use 0 instead.
+systemd_version=$(rpm -q systemd 2> /dev/null | cut -d '-' -f2)
+if  [ -n $systemd_version ] && [ $systemd_version -lt 229 ]; then
+    sed -i \
+      -e "s/^TimeoutStopSec=infinity/TimeoutStopSec=0/" \
+      /lib/systemd/system/logstash.service || true
+else
+    # Ensure's an upgraded system has the right setting, if it
+    # wasn't automatically replaced by the OS.
+    sed -i \
+      -e "s/^TimeoutStopSec=0/TimeoutStopSec=infinity/" \
+      /lib/systemd/system/logstash.service || true
+fi
+
 # Ensure the init script is picked up by systemd
 systemctl daemon-reload 2> /dev/null || true

pkg/debian/after-install.sh

@@ -11,3 +11,19 @@ sed -i \
 chmod 600 /etc/logstash/startup.options
 chmod 600 /etc/default/logstash
 
+# Starting from systemd 229, TimeouStopSec supports using
+# 'infinity' to disable not send a SIG Kill.
+#
+# Older versions need to use 0 instead.
+systemd_version=$(dpkg-query --showformat='${Version}' --show systemd 2> /dev/null)
+if  [ -n $systemd_version ] && dpkg --compare-versions "$systemd_version" lt 229 ; then
+    sed -i \
+      -e "s/^TimeoutStopSec=infinity/TimeoutStopSec=0/" \
+      /lib/systemd/system/logstash.service || true
+else
+    # Ensure's an upgraded system has the right setting, if it
+    # wasn't automatically replaced by the OS.
+    sed -i \
+      -e "s/^TimeoutStopSec=0/TimeoutStopSec=infinity/" \
+      /lib/systemd/system/logstash.service || true
+fi

pkg/ubuntu/after-install.sh

@@ -9,3 +9,20 @@ sed -i \
   /etc/logstash/logstash.yml
 chmod 600 /etc/logstash/startup.options
 chmod 600 /etc/default/logstash
+
+# Starting from systemd 229, TimeouStopSec supports using
+# 'infinity' to disable not send a SIG Kill.
+#
+# Older versions need to use 0 instead.
+systemd_version=$(dpkg-query --showformat='${Version}' --show systemd 2> /dev/null)
+if  [ -n $systemd_version ] && dpkg --compare-versions "$systemd_version" lt 229 ; then
+    sed -i \
+      -e "s/^TimeoutStopSec=infinity/TimeoutStopSec=0/" \
+      /lib/systemd/system/logstash.service || true
+else
+    # Ensure's an upgraded system has the right setting, if it
+    # wasn't automatically replaced by the OS.
+    sed -i \
+      -e "s/^TimeoutStopSec=0/TimeoutStopSec=infinity/" \
+      /lib/systemd/system/logstash.service || true
+fi