Add systemd utility package

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

Gopkg.lock

@@ -440,6 +440,7 @@
   analyzer-name = "dep"
   analyzer-version = 1
   input-imports = [
+    "github.com/alexellis/go-execute",
     "github.com/containerd/containerd",
     "github.com/containerd/containerd/cio",
     "github.com/containerd/containerd/containers",
@@ -451,6 +452,7 @@
     "github.com/spf13/cobra",
     "github.com/vishvananda/netlink",
     "github.com/vishvananda/netns",
+    "golang.org/x/sys/unix",
   ]
   solver-name = "gps-cdcl"
   solver-version = 1

Gopkg.toml

@@ -1,30 +1,3 @@
-# Gopkg.toml example
-#
-# Refer to https://golang.github.io/dep/docs/Gopkg.toml.html
-# for detailed Gopkg.toml documentation.
-#
-# required = ["github.com/user/thing/cmd/thing"]
-# ignored = ["github.com/user/project/pkgX", "bitbucket.org/user/project/pkgA/pkgY"]
-#
-# [[constraint]]
-#   name = "github.com/user/project"
-#   version = "1.0.0"
-#
-# [[constraint]]
-#   name = "github.com/user/project2"
-#   branch = "dev"
-#   source = "github.com/myfork/project2"
-#
-# [[override]]
-#   name = "github.com/x/y"
-#   version = "2.4.0"
-#
-# [prune]
-#   non-go = false
-#   go-tests = true
-#   unused-packages = true
-
-
 [[constraint]]
   name = "github.com/containerd/containerd"
   version = "1.3.2"
@@ -37,6 +10,11 @@
   name = "github.com/spf13/cobra"
   version = "0.0.5"
 
+
+[[constraint]]
+  name = "github.com/alexellis/go-execute"
+  version = "0.3.0"
+
 [prune]
   go-tests = true
   unused-packages = true

cmd/install.go

@@ -1,12 +1,11 @@
 package cmd
 
 import (
-	"bytes"
 	"fmt"
 	"os"
 	"path"
-	"path/filepath"
-	"text/template"
+
+	systemd "github.com/alexellis/faasd/pkg/systemd"
 
 	"github.com/spf13/cobra"
 )
@@ -29,12 +28,37 @@ func runInstall(_ *cobra.Command, _ []string) error {
 		return err
 	}
 
-	err = installUnit("faas-containerd")
+	err = systemd.InstallUnit("faas-containerd")
 	if err != nil {
 		return err
 	}
 
-	err = installUnit("faasd")
+	err = systemd.InstallUnit("faasd")
+	if err != nil {
+		return err
+	}
+
+	err = systemd.DaemonReload()
+	if err != nil {
+		return err
+	}
+
+	err = systemd.Enable("faas-containerd")
+	if err != nil {
+		return err
+	}
+
+	err = systemd.Enable("faasd")
+	if err != nil {
+		return err
+	}
+
+	err = systemd.Start("faas-containerd")
+	if err != nil {
+		return err
+	}
+
+	err = systemd.Start("faasd")
 	if err != nil {
 		return err
 	}
@@ -49,38 +73,3 @@ func binExists(folder, name string) error {
 	}
 	return nil
 }
-
-func installUnit(name string) error {
-
-	tmpl, err := template.ParseFiles("./hack/" + name + ".service")
-
-	wd, _ := os.Getwd()
-	var tpl bytes.Buffer
-	userData := struct {
-		Cwd string
-	}{
-		Cwd: wd,
-	}
-
-	err = tmpl.Execute(&tpl, userData)
-	if err != nil {
-		return err
-	}
-
-	err = writeUnit(name+".service", tpl.Bytes())
-
-	if err != nil {
-		return err
-	}
-	return nil
-}
-
-func writeUnit(name string, data []byte) error {
-	f, err := os.Create(filepath.Join("/lib/systemd/system", name))
-	if err != nil {
-		return err
-	}
-	defer f.Close()
-	_, err = f.Write(data)
-	return err
-}

hack/faas-containerd.service

@@ -3,10 +3,10 @@ Description=faasd-containerd
 
 [Service]
 MemoryLimit=500M
-ExecStart="/usr/local/bin/faas-containerd"
+ExecStart=/usr/local/bin/faas-containerd
 Restart=on-failure
 RestartSec=10s
-WorkingDirectory="/usr/local/bin/"
+WorkingDirectory=/usr/local/bin/
 
 [Install]
 WantedBy=multi-user.target

pkg/systemd/systemd.go

@@ -0,0 +1,100 @@
+package systemd
+
+import (
+	"bytes"
+	"fmt"
+	"os"
+	"path/filepath"
+	"text/template"
+
+	execute "github.com/alexellis/go-execute/pkg/v1"
+)
+
+func Enable(unit string) error {
+	task := execute.ExecTask{Command: "systemctl",
+		Args:        []string{"enable", unit},
+		StreamStdio: false,
+	}
+
+	res, err := task.Execute()
+	if err != nil {
+		return err
+	}
+
+	if res.ExitCode != 0 {
+		return fmt.Errorf("error executing task %s %v, stderr: %s", task.Command, task.Args, res.Stderr)
+	}
+
+	return nil
+}
+
+func Start(unit string) error {
+	task := execute.ExecTask{Command: "systemctl",
+		Args:        []string{"start", unit},
+		StreamStdio: false,
+	}
+
+	res, err := task.Execute()
+	if err != nil {
+		return err
+	}
+
+	if res.ExitCode != 0 {
+		return fmt.Errorf("error executing task %s %v, stderr: %s", task.Command, task.Args, res.Stderr)
+	}
+
+	return nil
+}
+
+func DaemonReload() error {
+	task := execute.ExecTask{Command: "systemctl",
+		Args:        []string{"daemon-reload"},
+		StreamStdio: false,
+	}
+
+	res, err := task.Execute()
+	if err != nil {
+		return err
+	}
+
+	if res.ExitCode != 0 {
+		return fmt.Errorf("error executing task %s %v, stderr: %s", task.Command, task.Args, res.Stderr)
+	}
+
+	return nil
+}
+
+func InstallUnit(name string) error {
+
+	tmpl, err := template.ParseFiles("./hack/" + name + ".service")
+
+	wd, _ := os.Getwd()
+	var tpl bytes.Buffer
+	userData := struct {
+		Cwd string
+	}{
+		Cwd: wd,
+	}
+
+	err = tmpl.Execute(&tpl, userData)
+	if err != nil {
+		return err
+	}
+
+	err = writeUnit(name+".service", tpl.Bytes())
+
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func writeUnit(name string, data []byte) error {
+	f, err := os.Create(filepath.Join("/lib/systemd/system", name))
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	_, err = f.Write(data)
+	return err
+}