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)
}
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func start(system bool, home string, name string) error {
sys, user, err := getMatchingSrvs(home, name)
if nil != err {
return err
}
var service string
if system {
service, err = getOneSysSrv(sys, user, name)
if nil != err {
return err
}
service = filepath.Join(srvSysPath, service)
} else {
service, err = getOneUserSrv(home, sys, user, name)
if nil != err {
return err
}
service = filepath.Join(home, srvUserPath, service)
}
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{"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)
fmt.Println()
fmt.Println("Starting systemd service unit...")
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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
}
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func install(c *service.Service) error {
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// Linux-specific config options
if c.System {
if "" == c.User {
c.User = "root"
}
}
if "" == c.Group {
c.Group = c.User
}
// 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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}
// Create service file from template
b, err := static.ReadFile("dist/etc/systemd/system/_name_.service.tmpl")
if err != nil {
return 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 err
}
err = tmpl.Execute(rw, c)
if nil != err {
return err
}
// 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, rw.Bytes(), 0644); err != nil {
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return fmt.Errorf("Error writing %s: %v", servicePath, err)
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}
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// TODO --no-start
err = start(c.System, c.Home, c.Name)
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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fmt.Printf("Added and started '%s' as a systemd service.\n", c.Name)
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return nil
}