[docs] add minimal nix documentation

.gitignore

@@ -1,8 +1,9 @@
 *.qcow2
+.envrc
 result
 example.json
 go.sum
 go.mod
-gokill
+./gokill
 output.md
 thoughts.md

README.md

@@ -0,0 +1,122 @@
+# gokill
+'gokill' is a tool that completes some actions when a certain event occurs.
+actions can vary from shuting down the machine to sending mails over erasing data.
+actions can be triggert by certain conditions like specific outcomes of unix
+comands or not having internet connection.
+
+actions and triggers should be easy to extend and handled like plugins. they
+also should be self documenting.
+every action and trigger should be testable at anytime as a 'dry-run'.
+actions can have a 'stage' defined. the lowest stage is started first,
+and only when all actions on that stage are finished next stage is triggered
+
+gokill should run as daemon. config should be read from /etc/somename/config.json
+
+## Config Example
+``` json
+[ //list of triggers
+    {
+		"type": "UsbDisconnect",
+		"name": "First Trigger",
+		"options": {
+			"deviceId": "ata-Samsung_SSD_860_EVO_1TB_S4AALKWJDI102",
+			"waitTillConnected": true //only trigger when usb drive was actually attached before
+		}
+        "actions": [ //list of actions that will be executed when triggered
+            {
+                "name": "unixCommand",
+                "options": {
+                    "command": "shutdown -h now"
+                },
+                "stage": 2 // defines the order in which actions are triggered.
+            },
+            {
+                "type": "sendMail",
+                "options": {
+                    "smtpserver": "domain.org",
+                    "port": 667,
+                    "recipients": [ "mail1@host.org", "mail2@host.org" ],
+                    "message": "kill switch was triggered",
+                    "attachments": [ "/path/atachments" ],
+                    "pubkeys": "/path/to/keys.pub"
+                },
+                "stage": 1 //this event is triggered first, then the shutdown
+            },
+        ]
+    },
+    {
+		"type": "EthernetDisconnect",
+		"name": "Second Trigger",
+		"options": {
+			"interfaceName": "eth0",
+		}
+        "actions": [
+            {
+                "name": "unixCommand",
+                "options": {
+                    "command": "env DISPLAY=:0 sudo su -c i3lock someUser"
+                }
+            }
+        ]
+    }
+]
+```
+
+## nix support
+
+gokill enjoys full nix support. gokill exposes a nix flakes that outputs a gokill package, a nixosModule and more.
+That means you can super easily incorporate gokill into your existing nixosConfigurations. 
+Here is a small example config:
+
+``` nix
+{
+  services.gokill.enable = true;
+  services.gokill.triggers = [
+    {
+      type = "EthernetDisconnect";
+      name = "MainTrigger";
+      options = {
+        interfaceName = "eth1";
+      };
+      actions = [
+        {
+            type = "Command";
+            options = {
+                command = "echo hello world";
+            };
+            stage = 1;
+        }
+      ];
+    }
+  ];
+}
+```
+
+This will automatically configure and enable a systemd running gokill as root user in the background
+
+## actions
+- [x] shutdown
+- [ ] wipe ram
+- [ ] send mail
+- [ ] delete data
+- [ ] shred area
+- [x] random command
+- [ ] wordpress post
+- [ ] ipfs command
+- [ ] [buskill 'triggers'](https://github.com/BusKill/awesome-buskill-triggers)
+    - [x] [lock-screen](https://github.com/BusKill/buskill-linux/tree/master/triggers)
+    - [x] shutdown
+    - [ ] luks header shredder
+    - [ ] veracrypt self-destruct
+
+## Triggers
+- [ ] no internet
+- [x] [pull usb stick](https://github.com/deepakjois/gousbdrivedetector/blob/master/usbdrivedetector_linux.go)
+- [x] ethernet unplugged
+- [ ] power adapter disconnected
+- [ ] unix command
+- anyOf
+    - trigger wrapper containing many triggers and fires as soon as one of them
+      is triggered
+- allOf
+- [ ] ipfs trigger

actions/actions.go

@@ -7,10 +7,12 @@ import (
 	"unknown.com/gokill/internal"
 )
 
+type ActionResultChan chan error
+
 type Action interface {
 	Execute()
 	DryExecute()
-	Create(internal.ActionConfig, chan bool) (Action, error)
+	Create(internal.ActionConfig, ActionResultChan) (Action, error)
 }
 
 type DocumentedAction interface {
@@ -23,7 +25,7 @@ type Stage struct {
 }
 
 type StagedActions struct {
-	ActionChan chan bool
+	ActionChan ActionResultChan
 	StageCount int
 	Stages     []Stage
 }
@@ -40,7 +42,11 @@ func (a StagedActions) executeInternal(f func(Action)) {
 		}
 
 		for range stage.Actions {
-			<-a.ActionChan
+			err := <-a.ActionChan
+
+			if err != nil {
+				fmt.Printf("Error occured on Stage %d: %s\n", idx+1, err)
+			}
 		}
 	}
 }
@@ -64,11 +70,11 @@ func (a StagedActions) Execute() {
 	a.executeInternal(func(a Action) { a.Execute() })
 }
 
-func (a StagedActions) Create(config internal.ActionConfig, c chan bool) (Action, error) {
+func (a StagedActions) Create(config internal.ActionConfig, c ActionResultChan) (Action, error) {
 	return StagedActions{}, nil
 }
 
-func NewSingleAction(config internal.ActionConfig, c chan bool) (Action, error) {
+func NewSingleAction(config internal.ActionConfig, c ActionResultChan) (Action, error) {
 	for _, availableAction := range GetAllActions() {
 		if config.Type == availableAction.GetName() {
 			return availableAction.Create(config, c)
@@ -83,7 +89,7 @@ func NewAction(config []internal.ActionConfig) (Action, error) {
 		return config[i].Stage < config[j].Stage
 	})
 
-	stagedActions := StagedActions{make(chan bool), 0, []Stage{}}
+	stagedActions := StagedActions{make(ActionResultChan), 0, []Stage{}}
 
 	stageMap := make(map[int][]Action)
 
@@ -116,6 +122,7 @@ func GetAllActions() []DocumentedAction {
 		Printer{},
 		TimeOut{},
 		Command{},
+		ShellScript{},
 		Shutdown{},
 	}
 }

actions/printer.go

@@ -9,20 +9,20 @@ import (
 
 type Printer struct {
 	Message    string
-	ActionChan chan bool
+	ActionChan ActionResultChan
 }
 
 func (p Printer) Execute() {
 	fmt.Printf("Print action fires. Message: %s\n", p.Message)
-	p.ActionChan <- true
+	p.ActionChan <- nil
 }
 
 func (p Printer) DryExecute() {
 	fmt.Printf("Print action fire test. Message: %s\n", p.Message)
-	p.ActionChan <- true
+	p.ActionChan <- nil
 }
 
-func (p Printer) Create(config internal.ActionConfig, c chan bool) (Action, error) {
+func (p Printer) Create(config internal.ActionConfig, c ActionResultChan) (Action, error) {
 	var result Printer
 	err := json.Unmarshal(config.Options, &result)
 
@@ -39,11 +39,30 @@ func (p Printer) GetName() string {
 }
 
 func (p Printer) GetDescription() string {
-	return "When triggered prints the configured message to stdout"
+	return `
+Prints a given message to stdout.
+This action is mostly used for debugging purposes.
+	`
+}
+
+func (p Printer) GetExample() string {
+	return `
+		{
+			type: "Print",
+			"options": {
+				"message": "Hello World!"
+			}
+		}
+	`
 }
 
 func (p Printer) GetOptions() []internal.ConfigOption {
 	return []internal.ConfigOption{
-		{"message", "string", "Message that should be printed", "\"\""},
+		{
+			Name: "message", 
+			Type: "string", 
+			Description: "Message that should be printed", 
+			Default: "\"\"",
+		},
 	}
 }

actions/shell_script.go

@@ -0,0 +1,119 @@
+package actions
+
+import (
+	"encoding/json"
+	"fmt"
+	"os/exec"
+	"os"
+
+	"unknown.com/gokill/internal"
+)
+
+type ShellScript struct {
+	Path string `json:"path"`
+	ActionChan ActionResultChan
+}
+
+func isExecutableFile(path string) bool {
+	fi, err := os.Lstat(path)
+
+	if err != nil {
+		fmt.Println("Test executing Shellscript Failed.")
+		return false
+	}
+
+	mode := fi.Mode()
+
+	//TODO: should check if current user can execute 
+	if mode&01111 == 0 {
+		return false
+	}
+
+	return true
+}
+
+func (c ShellScript) DryExecute() {
+	fmt.Printf("Test Executing ShellScript:\n%s\n", c.Path)
+
+	_, err := os.Open(c.Path)
+
+	if err != nil {
+		fmt.Println("Test executing Shellscript Failed.")
+		c.ActionChan <- err
+		return
+	}
+
+	if !isExecutableFile(c.Path) {
+		fmt.Println("Test executing Shellscript Failed.")
+		c.ActionChan <- fmt.Errorf("File is not executable: %s", c.Path)
+		return
+	}
+
+	c.ActionChan <- nil
+}
+
+func (c ShellScript) Execute() {
+	if !isExecutableFile(c.Path) {
+		fmt.Println("Test executing Shellscript Failed.")
+		c.ActionChan <- fmt.Errorf("File is not executable: %s", c.Path)
+		return
+	}
+
+	cmd := exec.Command("/bin/sh", c.Path)
+
+	stdout, err := cmd.Output()
+
+	if err != nil {
+		fmt.Println(err.Error())
+		c.ActionChan <- err
+	}
+
+	fmt.Println(string(stdout[:]))
+	c.ActionChan <- nil
+}
+
+func CreateShellScript(config internal.ActionConfig, c ActionResultChan) (ShellScript, error) {
+	result := ShellScript{}
+
+	err := json.Unmarshal(config.Options, &result)
+
+	if err != nil {
+		return ShellScript{}, err
+	}
+
+	if result.Path == "" {
+		return ShellScript{}, internal.OptionMissingError{"path"}
+	}
+
+	result.ActionChan = c
+	return result, nil
+}
+
+func (cc ShellScript) Create(config internal.ActionConfig, c ActionResultChan) (Action, error) {
+	return CreateShellScript(config, c)
+}
+
+func (p ShellScript) GetName() string {
+	return "ShellScript"
+}
+
+func (p ShellScript) GetDescription() string {
+	return "Executes the given shell script."
+}
+
+func (p ShellScript) GetExample() string {
+	return `
+	{
+		"type": "ShellScript",
+		"options": {
+			"path": "/path/to/file.sh"
+		}
+	}
+	`
+}
+
+func (p ShellScript) GetOptions() []internal.ConfigOption {
+	return []internal.ConfigOption{
+		{"path", "string", "path to script to execute", ""},
+	}
+}

actions/shutdown.go

@@ -3,33 +3,43 @@ package actions
 import (
 	"fmt"
 	"os/exec"
+	"encoding/json"
 
 	"unknown.com/gokill/internal"
 )
 
 type Shutdown struct {
-	ActionChan chan bool
+	Timeout string `json:"time"`
+	ActionChan ActionResultChan
 }
 
 func (s Shutdown) DryExecute() {
+	fmt.Printf("shutdown -h %s\n", s.Timeout)
 	fmt.Println("Test Shutdown executed...")
-
-	s.ActionChan <- true
-
+	s.ActionChan <- nil
 }
 
 func (s Shutdown) Execute() {
-	if err := exec.Command("shutdown", "-h", "now").Run(); err != nil {
+	if err := exec.Command("shutdown", "-h", s.Timeout).Run(); err != nil {
 		fmt.Println("Failed to initiate shutdown:", err)
 	}
 
 	fmt.Println("Shutdown executed...")
 
-	s.ActionChan <- true
+	s.ActionChan <- nil
 }
 
-func (s Shutdown) Create(config internal.ActionConfig, c chan bool) (Action, error) {
-	return Shutdown{c}, nil
+func (s Shutdown) Create(config internal.ActionConfig, c ActionResultChan) (Action, error) {
+	var result Shutdown
+	err := json.Unmarshal(config.Options, &result)
+
+	if err != nil {
+		fmt.Println("Parsing Shutdown options failed.")
+		return Shutdown{}, err
+	}
+
+	result.ActionChan = c
+	return result, nil
 }
 
 func (p Shutdown) GetName() string {
@@ -37,9 +47,27 @@ func (p Shutdown) GetName() string {
 }
 
 func (p Shutdown) GetDescription() string {
-	return "When triggered shuts down the machine"
+	return "Shutsdown the machine by perfoming a ```shutdown -h now```"
+}
+
+func (p Shutdown) GetExample() string {
+	return `
+	{
+		"type": "Shutdown",
+		"options": {
+			"time": "+5" //wait 5 minutes before shutdown
+		}
+	}
+	`
 }
 
 func (p Shutdown) GetOptions() []internal.ConfigOption {
-	return []internal.ConfigOption{}
+	return []internal.ConfigOption{
+		{
+			Name: "time",
+			Type: "string",
+			Description: "TIME parameter passed to shutdown as follows ```shutdown -h TIME```",
+			Default: "now",
+		},
+	}
 }

actions/timeout.go

@@ -10,7 +10,7 @@ import (
 
 type TimeOut struct {
 	Duration   time.Duration
-	ActionChan chan bool
+	ActionChan ActionResultChan
 }
 
 func (t TimeOut) DryExecute() {
@@ -20,10 +20,10 @@ func (t TimeOut) DryExecute() {
 func (t TimeOut) Execute() {
 	fmt.Printf("Waiting %d seconds\n", t.Duration)
 	time.Sleep(time.Duration(t.Duration) * time.Second)
-	t.ActionChan <- true
+	t.ActionChan <- nil
 }
 
-func (t TimeOut) Create(config internal.ActionConfig, c chan bool) (Action, error) {
+func (t TimeOut) Create(config internal.ActionConfig, c ActionResultChan) (Action, error) {
 	var result TimeOut
 	err := json.Unmarshal(config.Options, &result)
 
@@ -40,7 +40,21 @@ func (p TimeOut) GetName() string {
 }
 
 func (p TimeOut) GetDescription() string {
-	return "When triggered waits given duration before continuing with next stage"
+	return `
+Waits given duration in seconds.
+This can be used to wait a certain amount of time before continuing to the next Stage
+	`
+}
+
+func (p TimeOut) GetExample() string {
+	return `
+	{
+		"type": "Timeout",
+		"options": {
+			"duration": 5
+		}
+	}
+	`
 }
 
 func (p TimeOut) GetOptions() []internal.ConfigOption {

actions/unix_command.go

@@ -11,12 +11,37 @@ import (
 
 type Command struct {
 	Command    string   `json:"command"`
-	ActionChan chan bool
+	ActionChan ActionResultChan
+}
+
+func isCommandAvailable(name string) bool {
+  cmd := exec.Command("/bin/sh", "-c", "command -v "+name)
+  if err := cmd.Run(); err != nil {
+		return false
+  }
+
+  return true
 }
 
 func (c Command) DryExecute() {
-	fmt.Printf("Test Executing Command:\n%s ", c.Command)
-	c.ActionChan <- true
+	fmt.Printf("Test Executing Command:\n%s\n", c.Command)
+	command, _, err := c.splitCommandString()
+
+	if err != nil {
+		fmt.Printf("Error during argument parsing of command '%s'\n", c.Command)
+		fmt.Println(err)
+		return
+	}
+
+	isAvailable := isCommandAvailable(command)
+
+	if !isAvailable {
+		fmt.Printf("Command %s not found\n", command)
+		c.ActionChan <- fmt.Errorf("Command %s not found!", command)
+		return
+	}
+
+	c.ActionChan <- nil
 }
 
 func (c Command) splitCommandString() (string, []string, error) {
@@ -38,8 +63,7 @@ func (c Command) Execute() {
 	fmt.Println("Executing command: ", c.Command)
 
 	if err != nil {
-		fmt.Println(err)
-		c.ActionChan <- false
+		c.ActionChan <- err
 		return
 	}
 
@@ -49,14 +73,15 @@ func (c Command) Execute() {
 
 	if err != nil {
 		fmt.Println(err.Error())
+		c.ActionChan <- err
 	}
 
 	fmt.Println(string(stdout[:]))
 
-	c.ActionChan <- true
+	c.ActionChan <- nil
 }
 
-func CreateCommand(config internal.ActionConfig, c chan bool) (Command, error) {
+func CreateCommand(config internal.ActionConfig, c ActionResultChan) (Command, error) {
 	result := Command{}
 
 	err := json.Unmarshal(config.Options, &result)
@@ -74,7 +99,7 @@ func CreateCommand(config internal.ActionConfig, c chan bool) (Command, error) {
 	return result, nil
 }
 
-func (cc Command) Create(config internal.ActionConfig, c chan bool) (Action, error) {
+func (cc Command) Create(config internal.ActionConfig, c ActionResultChan) (Action, error) {
 	return CreateCommand(config, c)
 }
 
@@ -83,7 +108,18 @@ func (p Command) GetName() string {
 }
 
 func (p Command) GetDescription() string {
-	return "When triggered executes given command"
+	return "Invoces given command using exec."
+}
+
+func (p Command) GetExample() string {
+	return `
+	{
+		"type": "Command",
+		"options": {
+			"command": "srm /path/to/file"
+		}
+	}
+	`
 }
 
 func (p Command) GetOptions() []internal.ConfigOption {

cmd/docbuilder/docbuilder.go

@@ -0,0 +1,102 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+	"os"
+	"flag"
+
+	"unknown.com/gokill/actions"
+	"unknown.com/gokill/triggers"
+	"unknown.com/gokill/internal"
+)
+
+func getMarkdown(documenter internal.Documenter) string {
+	var result string
+	result += fmt.Sprintf("# %v\n%v\n\n", documenter.GetName(), documenter.GetDescription())
+
+	result += fmt.Sprintf("*Example:*\n``` json\n%v\n```\n## Options:\n", documenter.GetExample())
+	
+	for _, opt := range documenter.GetOptions() {
+		sanitizedDefault := "\"\""
+
+		if len(opt.Default) > 0 {
+			sanitizedDefault = opt.Default
+		}
+
+		result += fmt.Sprintf("### %v\n%v  \n\n*Type:* %v  \n\n*Default:* ```%v```  \n",
+			opt.Name, opt.Description, opt.Type, sanitizedDefault)
+	}
+
+	return result
+}
+
+func writeToFile(path string, documenter internal.Documenter) error {
+	fileName := fmt.Sprintf("%s/%s.md", path, documenter.GetName())
+
+	f, err := os.Create(fileName)
+
+	if err != nil {
+		fmt.Println(err)
+		return err
+	}
+
+	defer f.Close()
+
+	_, err = f.WriteString(getMarkdown(documenter))
+
+	if err != nil {
+		fmt.Println(err)
+		return err
+	}
+
+	return nil
+}
+
+func writeDocumentersToFiles(destination string) {
+	writeFolder := func(typeName string, documenters []internal.Documenter) {
+		path := fmt.Sprintf("%s/%s", destination, typeName)
+		_ = os.Mkdir(path, os.ModePerm)
+		for _, documenter := range documenters {
+			writeToFile(path, documenter)
+		}
+	}
+
+	actions := actions.GetDocumenters()
+	writeFolder("actions", actions)
+
+	triggers := triggers.GetDocumenters()
+	writeFolder("triggers", triggers)
+}
+
+func printDocumentersSummary() {
+	result := fmt.Sprintf("- [Triggers](triggers/README.md)\n")
+	for _, trigger := range triggers.GetDocumenters() {
+		result += fmt.Sprintf("\t- [%s](triggers/%s.md)\n", trigger.GetName(), trigger.GetName())
+	}
+
+	result += fmt.Sprintf("- [Actions](actions/README.md)\n")
+	for _, action := range actions.GetDocumenters() {
+		result += fmt.Sprintf("\t- [%s](actions/%s.md)\n", action.GetName(), action.GetName())
+	}
+
+	fmt.Print(result)
+}
+
+
+func main() {
+	outputPath := flag.String("output", "", "path where docs/ shoud be created")
+
+	flag.Parse()
+
+	if *outputPath == "" {
+		printDocumentersSummary()
+		return
+	}
+
+	if len(*outputPath) > 1 {
+		*outputPath = strings.TrimSuffix(*outputPath, "/")
+	}
+
+	writeDocumentersToFiles(*outputPath)
+}

docs/.gitignore

@@ -0,0 +1 @@
+book/*

docs/SUMMARY.md

@@ -0,0 +1,4 @@
+# Summary
+
+- [gokill](./README.md)
+@GOKILL_OPTIONS@

docs/actions/README.md

@@ -0,0 +1,21 @@
+# Actions
+
+Actions are executed when their parent Trigger got triggered. 
+They then perform some certain task depending on the specific action.
+Those can vary from shutding down the machine, removing a file or running a bash command.
+**Some Actions may cause permanent damage to the system. This is intended but should be used with caution.**  
+
+Actions can have a ```Stage``` assigned to define in which order they should run.
+The lowest stage is executed first and only when finished the next stage is executed.
+Actions on the same Stage run concurrently.
+
+Actions have the following syntax:
+``` json
+{
+  "type": "SomeAction",
+  "options": { //each action defines its own options
+    "firstOption": "someValue",
+    "stage": 2 //this (positive) number defines the order of multiple actions
+  }
+}
+```

docs/book.toml

@@ -0,0 +1,10 @@
+[book]
+authors = []
+language = "en"
+multilingual = false
+src = "."
+title = "gokill docs"
+
+[output.html.fold]
+enable = true
+level = 0

docs/default.nix

@@ -0,0 +1,33 @@
+{ pkgs, lib, self, ... }:
+
+with lib;
+let
+  docbuilder = self.packages.x86_64-linux.gokill-docbuilder;
+
+  prepareMD = ''
+    # Copy inputs into the build directory
+    cp -r --no-preserve=all $inputs/* ./
+    cp ${../README.md} ./README.md
+
+    ${docbuilder}/bin/docbuilder --output ./
+    substituteInPlace ./SUMMARY.md \
+    --replace "@GOKILL_OPTIONS@" "$(${docbuilder}/bin/docbuilder)"
+
+    cat ./SUMMARY.md
+  '';
+in
+pkgs.stdenv.mkDerivation {
+  name = "gokill-docs";
+  phases = [ "buildPhase" ];
+  buildInputs = [ pkgs.mdbook ];
+
+  inputs = sourceFilesBySuffices ./. [ ".md" ".toml" ];
+
+  buildPhase = ''
+    dest=$out/share/doc
+    mkdir -p $dest
+    ${prepareMD}
+    mdbook build
+    cp -r ./book/* $dest
+  '';
+}

docs/triggers/README.md

@@ -0,0 +1,19 @@
+# Triggers
+
+Triggers wait for certain events and execute the actions defined for them.
+There are different Triggers for different use cases.
+For example ```UsbDisconnect``` is triggered when a certain Usb Drive is unplugged.
+If you want your actions to be triggered when an ethernet cable is pulled use ```EthernetDisconnect``` instead.
+
+Triggers have the following syntax:
+``` json
+{
+  "type": "SomeTrigger",
+  "name": "MyFirstTrigger",
+  "options": { //each trigger defines its own options
+    "firstOption": 23,
+    "secondOption": "foo"
+  },
+  "actions": [] //list actions that should be executed here
+}
+```

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1697915759,
-        "narHash": "sha256-WyMj5jGcecD+KC8gEs+wFth1J1wjisZf8kVZH13f1Zo=",
+        "lastModified": 1698553279,
+        "narHash": "sha256-T/9P8yBSLcqo/v+FTOBK+0rjzjPMctVymZydbvR/Fak=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "51d906d2341c9e866e48c2efcaac0f2d70bfd43e",
+        "rev": "90e85bc7c1a6fc0760a94ace129d3a1c61c3d035",
         "type": "github"
       },
       "original": {

flake.nix

@@ -7,8 +7,17 @@
   outputs = { self, nixpkgs, ... }: 
   let
     forAllSystems = nixpkgs.lib.genAttrs [ "x86_64-linux" ];
+    pkgs = nixpkgs.legacyPackages."x86_64-linux";
   in
   {
+    devShell."x86_64-linux" = pkgs.mkShell {
+      packages = with pkgs; [
+        go
+        gotools
+        mdbook
+      ];
+    };
+
     packages.x86_64-linux.gokill = nixpkgs.legacyPackages.x86_64-linux.buildGoModule rec {
       pname = "gokill";
       version = "1.0";
@@ -19,12 +28,26 @@
         '';
     };
 
+    packages.x86_64-linux.gokill-docbuilder = nixpkgs.legacyPackages.x86_64-linux.buildGoModule rec {
+      pname = "docbuilder";
+      version = "1.0";
+      vendorHash = null;
+      buildFLags = "-o . $dest/cmd/gokill/docbuilder";
+      src = ./.;
+
+      postInstall = ''
+        '';
+    };
+
+
+    packages.x86_64-linux.docs = pkgs.callPackage (import ./docs/default.nix) { self = self; };
+
     packages.x86_64-linux.default = self.packages.x86_64-linux.gokill;
 
     nixosModules.gokill = { config, lib, pkgs, ... }: 
     let
       cfg = config.services.gokill;
-      configFile = pkgs.writeText "config.json" ''${cfg.extraConfig}''; 
+      configFile = pkgs.writeText "config.json" (builtins.toJSON cfg.triggers); 
       gokill-pkg = self.packages.x86_64-linux.gokill;
     in
     {
@@ -38,6 +61,45 @@
               '';
           };
 
+          triggers = lib.mkOption {
+            description = "list of triggers";
+            default = [];
+            type = with lib.types; lib.types.listOf ( submodule {
+              options = {
+                type = lib.mkOption {
+                  type = lib.types.str;
+                };
+
+                name = lib.mkOption {
+                  type = lib.types.str;
+                };
+
+                options = lib.mkOption {
+                  type = lib.types.attrs;
+                };
+
+                actions = lib.mkOption {
+                  description = "list of actions";
+                  type = with lib.types; lib.types.listOf ( submodule {
+                    options = {
+                      type = lib.mkOption {
+                        type = lib.types.str;
+                      };
+
+                      options = lib.mkOption {
+                        type = lib.types.attrs;
+                      };
+
+                      stage = lib.mkOption {
+                        type = lib.types.int;
+                      };
+                    };
+                  });
+                };
+              };
+            });
+          };
+
           extraConfig = lib.mkOption {
             type = lib.types.str;
             description = lib.mdDoc ''
@@ -69,53 +131,30 @@
           self.nixosModules.gokill
           {
             services.gokill.enable = true;
-            services.gokill.extraConfig = ''
-              [
+            services.gokill.triggers = [
               {
-                      "type": "Timeout", 
-                      "name": "custom timeout",
-                      "options": {
-                        "duration": 30
-                      },
-                      "actions": [
+                type = "Timeout";
+                name = "custom timeout";
+                options = {
+                  duration =  10;
+                };
+                actions = [
                     {
-                              "type": "Print",
-                              "options": {
-                                "message": "Stage 1 triggered. Waiting 25 seconds"
-                              },
-                              "stage": 1
-                          },
-                          {
-                              "type": "Timeout",
-                              "options": {
-                                "duration": 20
-                              },
-                              "stage": 1
-                          },
-                          {
-                              "type": "Timeout",
-                              "options": {
-                                "duration": 5
-                              },
-                              "stage": 2
-                          },
-                          {
-                              "type": "Print",
-                              "options": {
-                                "message": "Shutdown in 5 seconds..."
-                              },
-                              "stage": 2
-                          },
-                          {
-                              "type": "Shutdown",
-                              "options": {
-                              },
-                              "stage": 3
+                        type = "Timeout";
+                        options = {
+                          duration = 5;
+                        };
+                        stage = 1;
                     }
-                      ]
+                    {
+                        type = "Shutdown";
+                        options = {
+                        };
+                        stage = 2;
                     }
-              ]
-              '';
+                ];
+              }
+            ];
             users.users.root.password = "root";
             virtualisation.vmVariant.virtualisation.graphics = false;
           }
@@ -131,5 +170,11 @@
         ${self.packages."x86_64-linux".testVm}/bin/run-nixos-vm
       '');
     };
+
+    apps.x86_64-linux.docs = {
+      type = "app";
+      program = builtins.toString (nixpkgs.legacyPackages."x86_64-linux".writeScript "docs" ''
+        ${pkgs.python3}/bin/python3 -m http.server --directory ${self.packages."x86_64-linux".docs}/share/doc'');
+    };
   };
 }

go.mod

@@ -1,3 +1,3 @@
 module unknown.com/gokill
 
-go 1.20
+go 1.21.3

internal/config.go

@@ -36,5 +36,6 @@ type ConfigOption struct {
 type Documenter interface {
 	GetName() string
 	GetDescription() string
+	GetExample() string
 	GetOptions() []ConfigOption
 }

triggers/ethernet.go

@@ -3,7 +3,7 @@ package triggers
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"os"
 	"time"
 
 	"unknown.com/gokill/actions"
@@ -17,7 +17,7 @@ type EthernetDisconnect struct {
 }
 
 func isEthernetConnected(deviceName string) bool {
-	content, err := ioutil.ReadFile(fmt.Sprintf("/sys/class/net/%s/operstate", deviceName))
+	content, err := os.ReadFile(fmt.Sprintf("/sys/class/net/%s/operstate", deviceName))
 
 	if err != nil {
 		fmt.Println(err)
@@ -87,6 +87,21 @@ func (p EthernetDisconnect) GetDescription() string {
 	return "Triggers if Ethernetcable is disconnected."
 }
 
+func (p EthernetDisconnect) GetExample() string {
+	return `
+	{
+		"type": "EthernetDisconnect",
+		"name": "Example Trigger",
+		"options": {
+			"interfaceName": "eth0",
+			"waitTillConnected": true
+		},
+		"actions": [
+		]
+	}
+	`
+}
+
 func (p EthernetDisconnect) GetOptions() []internal.ConfigOption {
 	return []internal.ConfigOption{
 		{"waitTillConnected", "bool", "Only trigger when device was connected before", "true"},

triggers/timeout.go

@@ -1,5 +1,4 @@
 package triggers
-
 import (
 	"encoding/json"
 	"fmt"
@@ -45,7 +44,21 @@ func (p TimeOut) GetName() string {
 }
 
 func (p TimeOut) GetDescription() string {
-	return "Triggers after given duration."
+	return "Triggers after given duration. Mostly used for debugging."
+}
+
+func (p TimeOut) GetExample() string {
+	return `
+	{
+		"type": "Timeout",
+		"name": "Example Trigger",
+		"options": {
+			"duration": 5
+		},
+		"actions": [
+		]
+	}
+	`
 }
 
 func (p TimeOut) GetOptions() []internal.ConfigOption {

triggers/usb.go

@@ -85,9 +85,28 @@ func (p UsbDisconnect) GetName() string {
 }
 
 func (p UsbDisconnect) GetDescription() string {
-	return "Triggers when given usb drive is disconnected"
+	return `
+Triggers when given usb drive is disconnected.
+Currently it simply checks that the file /dev/disk/by-id/$deviceId exists.
+`
 }
 
+func (p UsbDisconnect) GetExample() string {
+	return `
+	{
+		"type": "UsbDisconnect",
+		"name": "Example Trigger",
+		"options": {
+			"deviceId": "ata-Samsung_SSD_860_EVO_1TB_S4AALKWJDI102",
+			"waitTillConnected": true
+		},
+		"actions": [
+		]
+	}
+	`
+}
+
+
 func (p UsbDisconnect) GetOptions() []internal.ConfigOption {
 	return []internal.ConfigOption{
 		{"waitTillConnected", "bool", "Only trigger when device was connected before", "true"},