147 lines
4.5 KiB
Go
147 lines
4.5 KiB
Go
package service
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import (
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"fmt"
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"os"
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"path/filepath"
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"strings"
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)
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// Service should describe the service well-enough for it to
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// run on Mac, Linux, and Windows.
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//
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// &Service{
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// // A human-friendy name
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// Title: "Foobar App",
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// // A computer-friendly name
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// Name: "foobar-app",
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// // A name for OS X plist
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// ReverseDNS: "com.example.foobar-app",
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// // A human-friendly description
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// Desc: "Foobar App",
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// // The app /service homepage
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// URL: "https://example.com/foobar-app/",
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// // The full path of the interpreter, if any (ruby, python, node, etc)
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// Interpreter: "/opt/node/bin/node",
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// // The name of the executable (or script)
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// Exec: "foobar-app.js",
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// // An array of arguments
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// Argv: []string{"-c", "/path/to/config.json"},
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// // A map of Environment variables that should be set
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// Envs: map[string]string{
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// PORT: "8080",
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// ENV: "development",
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// },
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// // The user (Linux & Mac only).
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// // This does not apply to userspace services.
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// // There may be special considerations
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// User: "www-data",
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// // If different from User
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// Group: "",
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// // Whether to install as a system or user service
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// System: false,
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// // Whether or not the service may need privileged ports
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// PrivilegedPorts: false,
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// }
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//
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// Note that some fields are exported for templating,
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// but not intended to be set by you.
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// These are documented as omitted from JSON.
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// Try to stick to what's outlined above.
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type Service struct {
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Title string `json:"title,omitempty"`
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Name string `json:"name"`
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Desc string `json:"desc,omitempty"`
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URL string `json:"url,omitempty"`
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ReverseDNS string `json:"reverse_dns"` // i.e. com.example.foo-app
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Interpreter string `json:"interpreter,omitempty"` // i.e. node, python
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Exec string `json:"exec"`
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Argv []string `json:"argv,omitempty"`
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Workdir string `json:"workdir,omitempty"`
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Envs map[string]string `json:"envs,omitempty"`
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User string `json:"user,omitempty"`
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Group string `json:"group,omitempty"`
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Home string `json:"-"`
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Local string `json:"-"`
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Logdir string `json:"logdir"`
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System bool `json:"system"`
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Restart bool `json:"restart"`
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Production bool `json:"production,omitempty"`
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PrivilegedPorts bool `json:"privileged_ports,omitempty"`
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MultiuserProtection bool `json:"multiuser_protection,omitempty"`
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}
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func (s *Service) NormalizeWithoutPath() {
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if "" == s.Name {
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ext := filepath.Ext(s.Exec)
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base := filepath.Base(s.Exec[:len(s.Exec)-len(ext)])
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s.Name = strings.ToLower(base)
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}
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if "" == s.Title {
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s.Title = s.Name
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}
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if "" == s.ReverseDNS {
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// technically should be something more like "com.example." + s.Name,
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// but whatever
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s.ReverseDNS = s.Name
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}
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if !s.System {
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home, err := os.UserHomeDir()
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if nil != err {
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fmt.Fprintf(os.Stderr, "Unrecoverable Error: %s", err)
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os.Exit(4)
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return
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}
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s.Home = home
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s.Local = filepath.Join(home, ".local")
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s.Logdir = filepath.Join(home, ".local", "share", s.Name, "var", "log")
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} else {
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s.Logdir = "/var/log/" + s.Name
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}
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}
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func (s *Service) Normalize(force bool) {
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s.NormalizeWithoutPath()
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// Check to see if Exec exists
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// /whatever => must exist exactly
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// ./whatever => must exist in current or WorkDir(TODO)
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// whatever => may also exist in {{ .Local }}/opt/{{ .Name }}/{{ .Exec }}
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_, err := os.Stat(s.Exec)
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if nil != err {
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bad := true
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if !strings.Contains(filepath.ToSlash(s.Exec), "/") {
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optpath := filepath.Join(s.Local, "/opt", s.Name, s.Exec)
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_, err := os.Stat(optpath)
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if nil == err {
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bad = false
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//fmt.Fprintf(os.Stderr, "Using '%s' for '%s'\n", optpath, s.Exec)
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s.Exec = optpath
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}
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}
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if bad {
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// TODO look for it in WorkDir?
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fmt.Fprintf(os.Stderr, "Error: '%s' could not be found.\n", s.Exec)
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if !force {
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os.Exit(5)
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return
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}
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execpath, err := filepath.Abs(s.Exec)
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if nil == err {
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s.Exec = execpath
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}
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fmt.Fprintf(os.Stderr, "Using '%s' anyway.\n", s.Exec)
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}
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} else {
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execpath, err := filepath.Abs(s.Exec)
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if nil != err {
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fmt.Fprintf(os.Stderr, "Unrecoverable Error: %s", err)
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os.Exit(4)
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} else {
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s.Exec = execpath
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}
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}
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}
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