go-serviceman/manager/install_linux.go

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package manager
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import (
"bytes"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"text/template"
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"git.rootprojects.org/root/go-serviceman/manager/static"
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"git.rootprojects.org/root/go-serviceman/service"
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)
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var (
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srvLen int
srvExt = ".service"
srvSysPath = "/etc/systemd/system"
// Not sure which of these it's supposed to be...
// * ~/.local/share/systemd/user/watchdog.service
// * ~/.config/systemd/user/watchdog.service
// https://wiki.archlinux.org/index.php/Systemd/User
// This seems to work on Ubuntu
srvUserPath = ".config/systemd/user"
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)
func init() {
srvLen = len(srvExt)
}
func start(conf *service.Service) error {
system := conf.System
home := conf.Home
name := conf.ReverseDNS
_, err := getService(system, home, name)
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if nil != err {
return err
}
var cmds []Runnable
if system {
cmds = []Runnable{
Runnable{
Exec: "systemctl",
Args: []string{"daemon-reload"},
Must: false,
},
Runnable{
Exec: "systemctl",
Args: []string{"stop", name + ".service"},
Must: false,
},
Runnable{
Exec: "systemctl",
Args: []string{"enable", name + ".service"},
Badwords: []string{"not found", "failed"},
Must: true,
},
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Runnable{
Exec: "systemctl",
Args: []string{"start", name + ".service"},
Badwords: []string{"not found", "failed"},
Must: true,
},
}
} else {
cmds = []Runnable{
Runnable{
Exec: "systemctl",
Args: []string{"--user", "daemon-reload"},
Must: false,
},
Runnable{
Exec: "systemctl",
Args: []string{"stop", "--user", name + ".service"},
Must: false,
},
Runnable{
Exec: "systemctl",
Args: []string{"start", "--user", name + ".service"},
Badwords: []string{"not found", "failed"},
Must: true,
},
}
}
cmds = adjustPrivs(system, cmds)
typ := "USER MODE"
if system {
typ = "SYSTEM"
}
fmt.Printf("Starting systemd %s service unit...\n\n", typ)
for i := range cmds {
exe := cmds[i]
fmt.Println("\t" + exe.String())
err := exe.Run()
if nil != err {
return err
}
}
fmt.Println()
return nil
}
func stop(conf *service.Service) error {
system := conf.System
home := conf.Home
name := conf.ReverseDNS
_, err := getService(system, home, name)
if nil != err {
return err
}
var cmds []Runnable
badwords := []string{"Failed to stop"}
if system {
cmds = []Runnable{
Runnable{
Exec: "systemctl",
Args: []string{"stop", name + ".service"},
Must: true,
Badwords: badwords,
},
}
} else {
cmds = []Runnable{
Runnable{
Exec: "systemctl",
Args: []string{"stop", "--user", name + ".service"},
Must: true,
Badwords: badwords,
},
}
}
cmds = adjustPrivs(system, cmds)
fmt.Println()
typ := "USER MODE"
if system {
typ = "SYSTEM"
}
fmt.Printf("Stopping systemd %s service...\n", typ)
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for i := range cmds {
exe := cmds[i]
fmt.Println("\t" + exe.String())
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err := exe.Run()
if nil != err {
return err
}
}
fmt.Println()
return nil
}
// Render will create a systemd .service file using a simple the internal template
func Render(c *service.Service) ([]byte, error) {
defaultUserGroup(c)
// Create service file from template
b, err := static.ReadFile("dist/etc/systemd/system/_name_.service.tmpl")
if err != nil {
return nil, err
}
s := string(b)
rw := &bytes.Buffer{}
// not sure what the template name does, but whatever
tmpl, err := template.New("service").Parse(s)
if err != nil {
return nil, err
}
err = tmpl.Execute(rw, c)
if nil != err {
return nil, err
}
return rw.Bytes(), nil
}
func install(c *service.Service) (string, error) {
defaultUserGroup(c)
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// Check paths first
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serviceDir := srvSysPath
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if !c.System {
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serviceDir = filepath.Join(c.Home, srvUserPath)
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err := os.MkdirAll(serviceDir, 0755)
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if nil != err {
return "", err
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}
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}
b, err := Render(c)
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if nil != err {
return "", err
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}
// Write the file out
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serviceName := c.Name + ".service"
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servicePath := filepath.Join(serviceDir, serviceName)
if err := ioutil.WriteFile(servicePath, b, 0644); err != nil {
return "", fmt.Errorf("Error writing %s: %v", servicePath, err)
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}
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// TODO --no-start
err = start(c)
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if nil != err {
sudo := ""
// --user-unit rather than --user --unit for older systemd
unit := "--user-unit"
if c.System {
sudo = "sudo "
unit = "--unit"
}
fmt.Printf("If things don't go well you should be able to get additional logging from journalctl:\n")
fmt.Printf("\t%sjournalctl -xe %s %s.service\n", sudo, unit, c.Name)
return "", err
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}
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return "systemd", nil
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}
func defaultUserGroup(c *service.Service) {
// Linux-specific config options
if c.System {
if "" == c.User {
c.User = "root"
}
}
if "" == c.Group {
c.Group = c.User
}
}