feat: order/delay in service files, enable cmd, --all on unit commands

- install/uninstall/start/stop/enable take <name> or --all; *all kept as shortcuts
- add enable (enable at boot + start); startall no longer enables
- order/delay resolved by config.ResolveOrder and written into systemd,
  OpenRC and runit service files (After=/sleep), so they apply at boot
- install --all stops and disables units before removing their files
- update regenerates all installed, enabled units and removes disabled ones
- edit creates the config dir; docs and man page updated
- tests: fake Init for cmd, ResolveOrder, backend ordering output

systemd/generator.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"strings"
 	"text/template"
+	"time"
 
 	"github.com/warkanum/unitdore/config"
 	"github.com/warkanum/unitdore/service"
@@ -14,7 +15,7 @@ const systemUnitTemplate = `# /etc/systemd/system/{{.ServiceName}}
 
 [Unit]
 Description=Unitdore: {{.Unit.Name}} ({{.Label}})
-After=network.target{{with .RuntimeService}} {{.}}
+After=network.target{{with .RuntimeService}} {{.}}{{end}}{{range .After}} {{.}}{{end}}{{with .RuntimeService}}
 Requires={{.}}{{end}}
 
 [Service]
@@ -25,6 +26,10 @@ RemainAfterExit=yes
 {{- with .WorkingDir}}
 WorkingDirectory={{.}}
 {{- end}}
+{{- with .DelaySec}}
+ExecStartPre=/usr/bin/env sleep {{.}}
+TimeoutStartSec={{$.StartTimeout}}
+{{- end}}
 ExecStart={{.ExecStart}}
 ExecStop={{if .ExecStop}}-{{.ExecStop}}{{end}}
 {{- if .Unit.Restart}}
@@ -44,7 +49,7 @@ const userUnitTemplate = `# ~/.config/systemd/user/{{.ServiceName}}
 
 [Unit]
 Description=Unitdore: {{.Unit.Name}} ({{.Label}})
-After=default.target
+After=default.target{{range .After}} {{.}}{{end}}
 
 [Service]
 Type={{.ServiceType}}
@@ -54,6 +59,10 @@ RemainAfterExit=yes
 {{- with .WorkingDir}}
 WorkingDirectory={{.}}
 {{- end}}
+{{- with .DelaySec}}
+ExecStartPre=/usr/bin/env sleep {{.}}
+TimeoutStartSec={{$.StartTimeout}}
+{{- end}}
 ExecStart={{.ExecStart}}
 ExecStop={{if .ExecStop}}-{{.ExecStop}}{{end}}
 {{- if .Unit.Restart}}
@@ -77,6 +86,9 @@ type templateData struct {
 	Label          string // shown in Description
 	ServiceType    string // simple | oneshot
 	WorkingDir     string
+	After          []string // service names of the previous order group
+	DelaySec       int      // ExecStartPre sleep, from unit delay
+	StartTimeout   int      // TimeoutStartSec when a delay is set
 }
 
 // ServiceName returns the systemd service name for a unit, with optional prefix/suffix.
@@ -102,6 +114,14 @@ func Generate(u config.Unit, prefix, suffix string) (string, error) {
 		WorkingDir:     spec.WorkingDir,
 	}
 
+	for _, n := range u.After {
+		data.After = append(data.After, ServiceName(config.Unit{Name: n}, prefix, suffix))
+	}
+	if u.StartDelay > 0 {
+		data.DelaySec = int((u.StartDelay + time.Second - 1) / time.Second)
+		data.StartTimeout = data.DelaySec + 90
+	}
+
 	tmplStr := systemUnitTemplate
 	if u.User != "" {
 		tmplStr = userUnitTemplate