refactor and add service runner

.ignore

@@ -0,0 +1 @@
+vendor

go.mod

@@ -5,6 +5,7 @@ go 1.12
 require (
 	git.rootprojects.org/root/go-gitver v1.1.2
 	github.com/UnnoTed/fileb0x v1.1.3
-	golang.org/x/net v0.0.0-20180921000356-2f5d2388922f
+	golang.org/x/net v0.0.0-20190620200207-3b0461eec859
-	golang.org/x/sys v0.0.0-20181019160139-8e24a49d80f8
+	golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a
+	golang.org/x/tools v0.0.0-20190702201734-44aeb8b7c377 // indirect
 )

go.sum

@@ -42,10 +42,19 @@ github.com/valyala/fasttemplate v0.0.0-20170224212429-dcecefd839c4 h1:gKMu1Bf6QI
 github.com/valyala/fasttemplate v0.0.0-20170224212429-dcecefd839c4/go.mod h1:50wTf68f99/Zt14pr046Tgt3Lp2vLyFZKzbFXTOabXw=
 golang.org/x/crypto v0.0.0-20180910181607-0e37d006457b h1:2b9XGzhjiYsYPnKXoEfL7klWZQIt8IfyRCz62gCqqlQ=
 golang.org/x/crypto v0.0.0-20180910181607-0e37d006457b/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/net v0.0.0-20180921000356-2f5d2388922f h1:QM2QVxvDoW9PFSPp/zy9FgxJLfaWTZlS61KEPtBwacM=
 golang.org/x/net v0.0.0-20180921000356-2f5d2388922f/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859 h1:R/3boaszxrf1GEUWTVDzSKVwLmSJpwZ1yqXm8j0v2QI=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20181019160139-8e24a49d80f8 h1:R91KX5nmbbvEd7w370cbVzKC+EzCTGqZq63Zad5IcLM=
 golang.org/x/sys v0.0.0-20181019160139-8e24a49d80f8/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a h1:1BGLXjeY4akVXGgbC9HugT3Jv3hCI0z56oJR5vAMgBU=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20190702201734-44aeb8b7c377 h1:P/0pu7r+pn3Fkv7pyRpb7tBawImpURm2mTIbR6MadCc=
+golang.org/x/tools v0.0.0-20190702201734-44aeb8b7c377/go.mod h1:jcCCGcm9btYwXyDqrUWc6MKQKKGJCWEQ3AfLSRIbEuI=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v2 v2.2.1 h1:mUhvW9EsL+naU5Q3cakzfE91YhliOondGd6ZrsDBHQE=

installer/install.go

@@ -7,75 +7,13 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
-)
 
-// Config should describe the service well-enough for it to
+	"git.rootprojects.org/root/go-serviceman/service"
-// run on Mac, Linux, and Windows.
+)
-//
-// 	&Config{
-// 		// A human-friendy name
-// 		Title: "Foobar App",
-// 		// A computer-friendly name
-// 		Name: "foobar-app",
-// 		// A name for OS X plist
-// 		ReverseDNS: "com.example.foobar-app",
-// 		// A human-friendly description
-// 		Desc: "Foobar App",
-// 		// The app /service homepage
-// 		URL: "https://example.com/foobar-app/",
-// 		// The full path of the interpreter, if any (ruby, python, node, etc)
-// 		Interpreter: "/opt/node/bin/node",
-// 		// The name of the executable (or script)
-// 		Exec: "foobar-app.js",
-// 		// An array of arguments
-// 		Argv: []string{"-c", "/path/to/config.json"},
-// 		// A map of Environment variables that should be set
-// 		Envs: map[string]string{
-// 			PORT: "8080",
-// 			ENV: "development",
-// 		},
-// 		// The user (Linux & Mac only).
-// 		// This does not apply to userspace services.
-// 		// There may be special considerations
-// 		User: "www-data",
-// 		// If different from User
-// 		Group: "",
-// 		// Whether to install as a system or user service
-// 		System: false,
-// 		// Whether or not the service may need privileged ports
-// 		PrivilegedPorts: false,
-// 	}
-//
-// Note that some fields are exported for templating,
-// but not intended to be set by you.
-// These are documented as omitted from JSON.
-// Try to stick to what's outlined above.
-type Config struct {
-	Title               string            `json:"title"`
-	Name                string            `json:"name"`
-	Desc                string            `json:"desc"`
-	URL                 string            `json:"url"`
-	ReverseDNS          string            `json:"reverse_dns"` // i.e. com.example.foo-app
-	Interpreter         string            `json:"interpreter"` // i.e. node, python
-	Exec                string            `json:"exec"`
-	Argv                []string          `json:"argv"`
-	Workdir             string            `json:"workdir"`
-	Envs                map[string]string `json:"envs"`
-	User                string            `json:"user"`
-	Group               string            `json:"group"`
-	home                string            `json:"-"`
-	Local               string            `json:"-"`
-	Logdir              string            `json:"-"`
-	System              bool              `json:"system"`
-	Restart             bool              `json:"restart"`
-	Production          bool              `json:"production"`
-	PrivilegedPorts     bool              `json:"privileged_ports"`
-	MultiuserProtection bool              `json:"multiuser_protection"`
-}
 
 // Install will do a best-effort attempt to install a start-on-startup
 // user or system service via systemd, launchd, or reg.exe
-func Install(c *Config) error {
+func Install(c *service.Service) error {
 	if "" == c.Exec {
 		c.Exec = c.Name
 	}
@@ -87,7 +25,7 @@ func Install(c *Config) error {
 			os.Exit(4)
 			return err
 		} else {
-			c.home = home
+			c.Home = home
 		}
 	}
 
@@ -112,6 +50,7 @@ func IsPrivileged() bool {
 }
 
 func WhereIs(exec string) (string, error) {
+	// TODO use exec.LookPath instead
 	exec = filepath.ToSlash(exec)
 	if strings.Contains(exec, "/") {
 		// it's a path (so we don't allow filenames with slashes)

installer/install_darwin.go

@@ -10,9 +10,10 @@ import (
 	"text/template"
 
 	"git.rootprojects.org/root/go-serviceman/installer/static"
+	"git.rootprojects.org/root/go-serviceman/service"
 )
 
-func install(c *Config) error {
+func install(c *service.Service) error {
 	// Darwin-specific config options
 	if c.PrivilegedPorts {
 		if !c.System {
@@ -21,7 +22,7 @@ func install(c *Config) error {
 	}
 	plistDir := "/Library/LaunchDaemons/"
 	if !c.System {
-		plistDir = filepath.Join(c.home, "Library/LaunchAgents")
+		plistDir = filepath.Join(c.Home, "Library/LaunchAgents")
 	}
 
 	// Check paths first
@@ -57,8 +58,8 @@ func install(c *Config) error {
 	}
 	fmt.Printf("Installed. To start '%s' run the following:\n", c.Name)
 	// TODO template config file
-	if "" != c.home {
+	if "" != c.Home {
-		plistPath = strings.Replace(plistPath, c.home, "~", 1)
+		plistPath = strings.Replace(plistPath, c.Home, "~", 1)
 	}
 	sudo := ""
 	if c.System {

installer/install_linux.go

@@ -9,9 +9,10 @@ import (
 	"text/template"
 
 	"git.rootprojects.org/root/go-serviceman/installer/static"
+	"git.rootprojects.org/root/go-serviceman/service"
 )
 
-func install(c *Config) error {
+func install(c *service.Service) error {
 	// Linux-specific config options
 	if c.System {
 		if "" == c.User {
@@ -30,7 +31,7 @@ func install(c *Config) error {
 		// * ~/.local/share/systemd/user/watchdog.service
 		// * ~/.config/systemd/user/watchdog.service
 		// https://wiki.archlinux.org/index.php/Systemd/User
-		serviceDir = filepath.Join(c.home, ".local/share/systemd/user")
+		serviceDir = filepath.Join(c.Home, ".local/share/systemd/user")
 		err := os.MkdirAll(filepath.Dir(serviceDir), 0755)
 		if nil != err {
 			return err

installer/install_notwindows.go

@@ -8,6 +8,7 @@ import (
 )
 
 func whereIs(exe string) (string, error) {
+	// TODO use exec.LookPath instead
 	cmd := exec.Command("command", "-v", exe)
 	out, err := cmd.Output()
 	if nil != err {

installer/install_other.go

@@ -2,6 +2,10 @@
 
 package installer
 
-func install(c *Config) error {
+import (
+	"git.rootprojects.org/root/go-serviceman/service"
+)
+
+func install(c *service.Service) error {
 	return nil, nil
 }

installer/install_windows.go

@@ -1,19 +1,25 @@
 package installer
 
 import (
+	"encoding/json"
 	"fmt"
+	"io/ioutil"
 	"log"
+	"os"
 	"os/exec"
 	"path/filepath"
 	"strings"
 
+	"git.rootprojects.org/root/go-serviceman/service"
+
 	"golang.org/x/sys/windows/registry"
 )
 
+// TODO nab some goodness from https://github.com/takama/daemon
+
 // TODO system service requires elevated privileges
 // See https://coolaj86.com/articles/golang-and-windows-and-admins-oh-my/
-func install(c *Config) error {
+func install(c *service.Service) error {
-	//token := windows.Token(0)
 	/*
 		// LEAVE THIS DOCUMENTATION HERE
 		reg.exe
@@ -51,9 +57,15 @@ func install(c *Config) error {
 	}
 	defer k.Close()
 
+	args, err := installServiceman(c)
+	if nil != err {
+		return err
+	}
+
+	/*
 		setArgs := ""
 		args := c.Argv
-	exec := filepath.Join(c.home, ".local", "opt", c.Name, c.Exec)
+		exec := c.Exec
 		bin := c.Interpreter
 		if "" != bin {
 			// If this is something like node or python,
@@ -75,6 +87,9 @@ func install(c *Config) error {
 		// "C:\Users\aj\.local\opt\appname\appname.js /c -p 8080"
 		// "C:\Program Files (x64)\nodejs\node.exe /c C:\Users\aj\.local\opt\appname\appname.js -p 8080"
 		regSZ := bin + setArgs + strings.Join(c.Argv, " ")
+	*/
+
+	regSZ := fmt.Sprintf("%s /c %s", args[0], strings.Join(args[1:], " "))
 	if len(regSZ) > 260 {
 		return fmt.Errorf("data value is too long for registry entry")
 	}
@@ -85,7 +100,52 @@ func install(c *Config) error {
 	return nil
 }
 
+// copies self to install path and returns config path
+func installServiceman(c *service.Service) ([]string, error) {
+	// TODO check version and upgrade or dismiss
+	self := os.Args[0]
+	smdir := `\opt\serviceman`
+	// TODO support service level services (which probably wouldn't need serviceman)
+	smdir = filepath.Join(c.Home, ".local", smdir)
+	// for now we'll scope the runner to the name of the application
+	smbin := filepath.Join(smdir, `bin\serviceman.%s`, c.Name)
+
+	if smbin != self {
+		err := os.MkdirAll(filepath.Dir(smbin))
+		if nil != err {
+			return "", err
+		}
+		bin, err := ioutil.ReadFile(self)
+		if nil != err {
+			return "", err
+		}
+		err := ioutil.WriteFile(smbin, bin, 0755)
+		if nil != err {
+			return "", err
+		}
+	}
+
+	b, err := json.Marshal(c)
+	if nil != err {
+		// this should be impossible, so we'll just panic
+		panic(err)
+	}
+	confpath := filepath.Join(smpath, `etc`, conf.Name+`.json`)
+	err := ioutil.WriteFile(confpath, b, 0640)
+	if nil != err {
+		return err
+	}
+
+	return []string{
+		smbin,
+		"run",
+		"--config",
+		confpath,
+	}, nil
+}
+
 func whereIs(exe string) (string, error) {
+	// TODO use exec.LookPath instead
 	cmd := exec.Command("where.exe", exe)
 	out, err := cmd.Output()
 	if nil != err {

runner/runner.go

@@ -0,0 +1,85 @@
+package runner
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"time"
+
+	"git.rootprojects.org/root/go-serviceman/service"
+)
+
+// Notes on spawning a child process
+// https://groups.google.com/forum/#!topic/golang-nuts/shST-SDqIp4
+
+func Run(conf *service.Service) {
+	originalBackoff := 1 * time.Second
+	maxBackoff := 1 * time.Minute
+	threshold := 5 * time.Second
+
+	backoff := originalBackoff
+	failures := 0
+	logfile := filepath.Join(conf.Logdir, conf.Name+".log")
+
+	binpath := conf.Exec
+	args := []string{}
+	if "" != conf.Interpreter {
+		binpath = conf.Interpreter
+		args = append(args, conf.Exec)
+	}
+	args = append(args, conf.Argv...)
+
+	for {
+		// setup the log
+		lf, err := os.OpenFile(logfile, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644)
+		if nil != err {
+			fmt.Fprintf(os.Stderr, "Could not open log file %q\n", logfile)
+			lf = os.Stderr
+		} else {
+			defer lf.Close()
+		}
+
+		start := time.Now()
+		cmd := exec.Command(binpath, args...)
+		cmd.Stdin = nil
+		cmd.Stdout = lf
+		cmd.Stderr = lf
+		if "" != conf.Workdir {
+			cmd.Dir = conf.Workdir
+		}
+		err = cmd.Start()
+		if nil != err {
+			fmt.Fprintf(lf, "Could not start %q process: %s\n", conf.Name, err)
+		} else {
+			err = cmd.Wait()
+			if nil != err {
+				fmt.Fprintf(lf, "Process %q failed with error: %s\n", conf.Name, err)
+			} else {
+				fmt.Fprintf(lf, "Process %q exited cleanly\n", conf.Name)
+				fmt.Printf("Process %q exited cleanly\n", conf.Name)
+			}
+		}
+
+		// if this is a oneshot... so it is
+		if !conf.Restart {
+			fmt.Printf("Not restarting %q because `restart` set to `false`\n", conf.Name)
+			fmt.Fprintf(lf, "Not restarting %q because `restart` set to `false`\n", conf.Name)
+			break
+		}
+
+		end := time.Now()
+		if end.Sub(start) > threshold {
+			backoff = originalBackoff
+			failures = 0
+		} else {
+			failures += 1
+			fmt.Fprintf(lf, "Waiting %s to restart %q (%d consequtive immediate exits)\n", backoff, conf.Name, failures)
+			time.Sleep(backoff)
+			backoff *= 2
+			if backoff > maxBackoff {
+				backoff = maxBackoff
+			}
+		}
+	}
+}

service/service.go

@@ -0,0 +1,141 @@
+package service
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+// Service should describe the service well-enough for it to
+// run on Mac, Linux, and Windows.
+//
+// 	&Service{
+// 		// A human-friendy name
+// 		Title: "Foobar App",
+// 		// A computer-friendly name
+// 		Name: "foobar-app",
+// 		// A name for OS X plist
+// 		ReverseDNS: "com.example.foobar-app",
+// 		// A human-friendly description
+// 		Desc: "Foobar App",
+// 		// The app /service homepage
+// 		URL: "https://example.com/foobar-app/",
+// 		// The full path of the interpreter, if any (ruby, python, node, etc)
+// 		Interpreter: "/opt/node/bin/node",
+// 		// The name of the executable (or script)
+// 		Exec: "foobar-app.js",
+// 		// An array of arguments
+// 		Argv: []string{"-c", "/path/to/config.json"},
+// 		// A map of Environment variables that should be set
+// 		Envs: map[string]string{
+// 			PORT: "8080",
+// 			ENV: "development",
+// 		},
+// 		// The user (Linux & Mac only).
+// 		// This does not apply to userspace services.
+// 		// There may be special considerations
+// 		User: "www-data",
+// 		// If different from User
+// 		Group: "",
+// 		// Whether to install as a system or user service
+// 		System: false,
+// 		// Whether or not the service may need privileged ports
+// 		PrivilegedPorts: false,
+// 	}
+//
+// Note that some fields are exported for templating,
+// but not intended to be set by you.
+// These are documented as omitted from JSON.
+// Try to stick to what's outlined above.
+type Service struct {
+	Title               string            `json:"title"`
+	Name                string            `json:"name"`
+	Desc                string            `json:"desc"`
+	URL                 string            `json:"url"`
+	ReverseDNS          string            `json:"reverse_dns"` // i.e. com.example.foo-app
+	Interpreter         string            `json:"interpreter"` // i.e. node, python
+	Exec                string            `json:"exec"`
+	Argv                []string          `json:"argv"`
+	Workdir             string            `json:"workdir"`
+	Envs                map[string]string `json:"envs"`
+	User                string            `json:"user"`
+	Group               string            `json:"group"`
+	Home                string            `json:"-"`
+	Local               string            `json:"-"`
+	Logdir              string            `json:"logdir"`
+	System              bool              `json:"system"`
+	Restart             bool              `json:"restart"`
+	Production          bool              `json:"production"`
+	PrivilegedPorts     bool              `json:"privileged_ports"`
+	MultiuserProtection bool              `json:"multiuser_protection"`
+}
+
+func (s *Service) Normalize(force bool) {
+	if "" == s.Name {
+		ext := filepath.Ext(s.Exec)
+		base := filepath.Base(s.Exec[:len(s.Exec)-len(ext)])
+		s.Name = strings.ToLower(base)
+	}
+	if "" == s.Title {
+		s.Title = s.Name
+	}
+	if "" == s.ReverseDNS {
+		// technically should be something more like "com.example." + s.Name,
+		// but whatever
+		s.ReverseDNS = s.Name
+	}
+
+	if !s.System {
+		home, err := os.UserHomeDir()
+		if nil != err {
+			fmt.Fprintf(os.Stderr, "Unrecoverable Error: %s", err)
+			os.Exit(4)
+			return
+		}
+		s.Local = filepath.Join(home, ".local")
+		s.Logdir = filepath.Join(home, ".local", "share", s.Name, "var", "log")
+	} else {
+		s.Logdir = "/var/log/" + s.Name
+	}
+
+	// Check to see if Exec exists
+	//   /whatever => must exist exactly
+	//   ./whatever => must exist in current or WorkDir(TODO)
+	//   whatever => may also exist in {{ .Local }}/opt/{{ .Name }}/{{ .Exec }}
+	_, err := os.Stat(s.Exec)
+	if nil != err {
+		bad := true
+		if !strings.Contains(filepath.ToSlash(s.Exec), "/") {
+			optpath := filepath.Join(s.Local, "/opt", s.Name, s.Exec)
+			_, err := os.Stat(optpath)
+			if nil == err {
+				bad = false
+				fmt.Fprintf(os.Stderr, "Using '%s' for '%s'\n", optpath, s.Exec)
+				s.Exec = optpath
+			}
+		}
+
+		if bad {
+			// TODO look for it in WorkDir?
+			fmt.Fprintf(os.Stderr, "Error: '%s' could not be found.\n", s.Exec)
+			if !force {
+				os.Exit(5)
+				return
+			}
+			execpath, err := filepath.Abs(s.Exec)
+			if nil == err {
+				s.Exec = execpath
+			}
+			fmt.Fprintf(os.Stderr, "Using '%s' anyway.\n", s.Exec)
+		}
+	} else {
+		execpath, err := filepath.Abs(s.Exec)
+		if nil != err {
+			fmt.Fprintf(os.Stderr, "Unrecoverable Error: %s", err)
+			os.Exit(4)
+		} else {
+			s.Exec = execpath
+		}
+	}
+}

serviceman.go

@@ -3,22 +3,52 @@
 package main
 
 import (
+	"encoding/json"
 	"flag"
 	"fmt"
+	"io/ioutil"
 	"os"
-	"path/filepath"
+	"os/exec"
 	"strings"
 	"time"
 
 	"git.rootprojects.org/root/go-serviceman/installer"
+	"git.rootprojects.org/root/go-serviceman/runner"
+	"git.rootprojects.org/root/go-serviceman/service"
 )
 
 var GitRev = "000000000"
 var GitVersion = "v0.0.0"
 var GitTimestamp = time.Now().Format(time.RFC3339)
 
+func usage() {
+	fmt.Println("Usage: serviceman install ./foo-app -- --foo-arg")
+	fmt.Println("Usage: serviceman run --config ./foo-app.json")
+}
+
 func main() {
-	conf := &installer.Config{
+	if len(os.Args) < 2 {
+		fmt.Fprintf(os.Stderr, "Too few arguments: %s\n", strings.Join(os.Args, " "))
+		usage()
+		os.Exit(1)
+	}
+
+	top := os.Args[1]
+	os.Args = append(os.Args[:1], os.Args[2:]...)
+	switch top {
+	case "install":
+		install()
+	case "run":
+		run()
+	default:
+		fmt.Fprintf(os.Stderr, "Unknown argument %s\n", top)
+		usage()
+		os.Exit(1)
+	}
+}
+
+func install() {
+	conf := &service.Service{
 		Restart: true,
 	}
 
@@ -91,72 +121,7 @@ func main() {
 		conf.Argv = append(args[1:], conf.Argv...)
 	}
 
-	if "" == conf.Name {
+	conf.Normalize(force)
-		ext := filepath.Ext(conf.Exec)
-		base := filepath.Base(conf.Exec[:len(conf.Exec)-len(ext)])
-		conf.Name = strings.ToLower(base)
-	}
-	if "" == conf.Title {
-		conf.Title = conf.Name
-	}
-	if "" == conf.ReverseDNS {
-		// technically should be something more like "com.example." + conf.Name,
-		// but whatever
-		conf.ReverseDNS = conf.Name
-	}
-
-	if !conf.System {
-		home, err := os.UserHomeDir()
-		if nil != err {
-			fmt.Fprintf(os.Stderr, "Unrecoverable Error: %s", err)
-			os.Exit(4)
-			return
-		}
-		conf.Local = filepath.Join(home, ".local")
-		conf.Logdir = filepath.Join(home, ".local", "share", conf.Name, "var", "log")
-	} else {
-		conf.Logdir = "/var/log/" + conf.Name
-	}
-
-	// Check to see if Exec exists
-	//   /whatever => must exist exactly
-	//   ./whatever => must exist in current or WorkDir(TODO)
-	//   whatever => may also exist in {{ .Local }}/opt/{{ .Name }}/{{ .Exec }}
-	_, err = os.Stat(conf.Exec)
-	if nil != err {
-		bad := true
-		if !strings.Contains(filepath.ToSlash(conf.Exec), "/") {
-			optpath := filepath.Join(conf.Local, "/opt", conf.Name, conf.Exec)
-			_, err := os.Stat(optpath)
-			if nil == err {
-				bad = false
-				fmt.Fprintf(os.Stderr, "Using '%s' for '%s'\n", optpath, conf.Exec)
-				conf.Exec = optpath
-			}
-		}
-
-		if bad {
-			// TODO look for it in WorkDir?
-			fmt.Fprintf(os.Stderr, "Error: '%s' could not be found.\n", conf.Exec)
-			if !force {
-				os.Exit(5)
-				return
-			}
-			execpath, err := filepath.Abs(conf.Exec)
-			if nil == err {
-				conf.Exec = execpath
-			}
-			fmt.Fprintf(os.Stderr, "Using '%s' anyway.\n", conf.Exec)
-		}
-	} else {
-		execpath, err := filepath.Abs(conf.Exec)
-		if nil != err {
-			fmt.Fprintf(os.Stderr, "Unrecoverable Error: %s", err)
-			os.Exit(4)
-		} else {
-			conf.Exec = execpath
-		}
-	}
 
 	fmt.Printf("\n%#v\n\n", conf)
 
@@ -167,3 +132,72 @@ func main() {
 		fmt.Fprintf(os.Stderr, "Use '--user' to install as an user service.\n")
 	}
 }
+
+func run() {
+	var confpath string
+	var daemonize bool
+	flag.StringVar(&confpath, "config", "", "path to a config file to run")
+	flag.BoolVar(&daemonize, "daemon", false, "spawn a child process that lives in the background, and exit")
+	flag.Parse()
+
+	if "" == confpath {
+		fmt.Fprintf(os.Stderr, "%s", strings.Join(flag.Args(), " "))
+		fmt.Fprintf(os.Stderr, "--config /path/to/config.json is required\n")
+		usage()
+		os.Exit(1)
+	}
+
+	b, err := ioutil.ReadFile(confpath)
+	if nil != err {
+		fmt.Fprintf(os.Stderr, "Couldn't read config file: %s\n", err)
+		os.Exit(400)
+	}
+
+	s := &service.Service{}
+	err = json.Unmarshal(b, s)
+	if nil != err {
+		fmt.Fprintf(os.Stderr, "Couldn't JSON parse config file: %s\n", err)
+		os.Exit(400)
+	}
+
+	m := map[string]interface{}{}
+	err = json.Unmarshal(b, &m)
+	if nil != err {
+		fmt.Fprintf(os.Stderr, "Couldn't JSON parse config file: %s\n", err)
+		os.Exit(400)
+	}
+
+	// default Restart to true
+	if _, ok := m["restart"]; !ok {
+		s.Restart = true
+	}
+
+	if "" == s.Exec {
+		fmt.Fprintf(os.Stderr, "Missing exec\n")
+		os.Exit(400)
+	}
+
+	s.Normalize(false)
+	fmt.Fprintf(os.Stdout, "Logdir: %s\n", s.Logdir)
+	if !daemonize {
+		fmt.Fprintf(os.Stdout, "Running %s %s %s\n", s.Interpreter, s.Exec, strings.Join(s.Argv, " "))
+		runner.Run(s)
+		return
+	}
+
+	cmd := exec.Command(os.Args[0], "run", "--config", confpath)
+	// for debugging
+	/*
+		out, err := cmd.CombinedOutput()
+		if nil != err {
+			fmt.Println(err)
+		}
+		fmt.Println(string(out))
+	*/
+
+	err = cmd.Start()
+	if nil != err {
+		fmt.Fprintf(os.Stderr, "%s\n", err)
+		os.Exit(500)
+	}
+}