Extract systemd template to pkg/install/linux_systemd.go

Unlike openrc, upstart and system v unit file templates, the systemd
template was defined in pkg/install/service.go. Here it is extracted
into a dedicated file like the other templates.

Signed-off-by: Kimmo Lehto <klehto@mirantis.com>

pkg/install/linux_systemd.go

@@ -0,0 +1,58 @@
+/*
+Copyright 2024 k0s authors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package install
+
+// Upstream kardianos/service does not support all the options we want to set to the systemd unit, hence we override the template
+// Currently mostly for KillMode=process so we get systemd to only send the sigterm to the main process
+const systemdScript = `[Unit]
+Description={{.Description}}
+Documentation=https://docs.k0sproject.io
+ConditionFileIsExecutable={{.Path|cmdEscape}}
+{{range $i, $dep := .Dependencies}}
+{{$dep}} {{end}}
+
+[Service]
+StartLimitInterval=5
+StartLimitBurst=10
+ExecStart={{.Path|cmdEscape}}{{range .Arguments}} {{.|cmdEscape}}{{end}}
+Environment="{{- range $key, $value := .EnvVars}}{{$key}}={{$value}} {{- end}}"
+
+RestartSec=10
+Delegate=yes
+KillMode=process
+LimitCORE=infinity
+TasksMax=infinity
+TimeoutStartSec=0
+
+{{- if .ChRoot}}RootDirectory={{.ChRoot|cmd}}{{- end}}
+
+{{- if .WorkingDirectory}}WorkingDirectory={{.WorkingDirectory|cmdEscape}}{{- end}}
+{{- if .UserName}}User={{.UserName}}{{end}}
+{{- if .ReloadSignal}}ExecReload=/bin/kill -{{.ReloadSignal}} "$MAINPID"{{- end}}
+{{- if .PIDFile}}PIDFile={{.PIDFile|cmd}}{{- end}}
+{{- if and .LogOutput .HasOutputFileSupport -}}
+StandardOutput=file:/var/log/{{.Name}}.out
+StandardError=file:/var/log/{{.Name}}.err
+{{- end}}
+
+{{- if .SuccessExitStatus}}SuccessExitStatus={{.SuccessExitStatus}}{{- end}}
+{{ if gt .LimitNOFILE -1 }}LimitNOFILE={{.LimitNOFILE}}{{- end}}
+{{ if .Restart}}Restart={{.Restart}}{{- end}}
+
+[Install]
+WantedBy=multi-user.target
+`

pkg/install/service.go

@@ -172,45 +172,3 @@ func prepareEnvVars(envVars []string) map[string]string {
 	}
 	return result
 }
-
-// Upstream kardianos/service does not support all the options we want to set to the systemd unit, hence we override the template
-// Currently mostly for KillMode=process so we get systemd to only send the sigterm to the main process
-const systemdScript = `[Unit]
-Description={{.Description}}
-Documentation=https://docs.k0sproject.io
-ConditionFileIsExecutable={{.Path|cmdEscape}}
-{{range $i, $dep := .Dependencies}}
-{{$dep}} {{end}}
-
-[Service]
-StartLimitInterval=5
-StartLimitBurst=10
-ExecStart={{.Path|cmdEscape}}{{range .Arguments}} {{.|cmdEscape}}{{end}}
-{{- if .Option.Environment}}{{range .Option.Environment}}
-Environment="{{.}}"{{end}}{{- end}}
-
-RestartSec=10
-Delegate=yes
-KillMode=process
-LimitCORE=infinity
-TasksMax=infinity
-TimeoutStartSec=0
-
-{{- if .ChRoot}}RootDirectory={{.ChRoot|cmd}}{{- end}}
-
-{{- if .WorkingDirectory}}WorkingDirectory={{.WorkingDirectory|cmdEscape}}{{- end}}
-{{- if .UserName}}User={{.UserName}}{{end}}
-{{- if .ReloadSignal}}ExecReload=/bin/kill -{{.ReloadSignal}} "$MAINPID"{{- end}}
-{{- if .PIDFile}}PIDFile={{.PIDFile|cmd}}{{- end}}
-{{- if and .LogOutput .HasOutputFileSupport -}}
-StandardOutput=file:/var/log/{{.Name}}.out
-StandardError=file:/var/log/{{.Name}}.err
-{{- end}}
-
-{{- if .SuccessExitStatus}}SuccessExitStatus={{.SuccessExitStatus}}{{- end}}
-{{ if gt .LimitNOFILE -1 }}LimitNOFILE={{.LimitNOFILE}}{{- end}}
-{{ if .Restart}}Restart={{.Restart}}{{- end}}
-
-[Install]
-WantedBy=multi-user.target
-`